The Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001Assessment of two different Splinting materials on the immediate functional loading of Implants placed in mandibular unilateral free end saddle cases353535427917510.21608/edj.2018.79175ENHeba E.KhorshidLecturer, Department of Prosthodontics, Faculty of Oral and Dental Medicine, Cairo University.Nora M.ShetaAssistant Professor, Department of Prosthodontics, Faculty of Oral and Dental Medicine, Cairo UniversityJournal Article20200326Background: The class II Kennedy mandibular removable partial denture has many problems<br />as the different nature of support as well as crossing the arch for stabilization. The Target of this<br />work was to evaluate the changes that occurs in the supporting structures of the implants<br />placed in class II Kennedy cases as a result of two different types of splinting materials.<br />Materials and Methods: Thirty implants were placed in ten patients with unmodified<br />mandibular Kennedy Class II. For each patient, three implants were placed at the premolar/molar<br />mandibular region. All the implants were immediately loaded following an Immediate Functional<br />Loading Protocol. Patients were divided into two equal groups; Group A: received superstructures<br />that were splinted with acrylic resin while Group B; received superstructures that were splinted<br />with metal. Radiographic evaluation using dental CT was carried out at intervals of 0, 6, 12 and<br />24 months after implant surgery.<br />Results: The results comprised the assessment of the bone height changes surrounding the<br />three implants placed unilaterally in the posterior mandibular areas of ten patients as a result of two<br />different splinting materials; the acrylic resin and the chrome cobalt metal alloy. Statistical analysis<br />showed that there was a statistically significant difference in the mean bone height values along the<br />whole study period between both groups (P ≤ 0.05) where there was more favorable bone height<br />values and hard tissue reaction in Group B (metal splinting) than Group A (Acrylic splinting).<br />Conclusion: Within the limitation of this study, it can be concluded that the rigid splinting<br />and immobilization of immediately loaded implants by metallic superstructures reduced the<br />transmission of micro-motion to the implant bodies and improved peri-implant bone reaction in<br />comparison with the use of the less rigid acrylic resin material.<br /> https://edj.journals.ekb.eg/article_79175_8516c8fc4eca05b1d6c9267f79d25dde.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001EFFECT OF ATTACHMENT RESILEINCY ON MUSCLE ACTIVITY IN IMPLANT RETAINED MANDIBULAR OVERDENTURE354335507917610.21608/edj.2018.79176ENNadaEl KhourzatyLecturer, Removable Prosthodontics, Faculty of Dentistry, Cairo University, Cairo, EgyptNancy NElsherbiniLecturer, Removable Prosthodontics, Faculty of Dentistry, Cairo University, Cairo, EgyptAliaa ATawfikLecturer, Clinical Neurophysiology Unit, Faculty of Medicine, Cairo University, Cairo, EgyptJournal Article20200326Objectives: This study aimed to investigate masticatory muscle activity in patients treated with<br />2 modalities of implant mandibular overdenture prosthesis.<br />Methodology: Fourteen completely edentulous male patients were selected and four implants<br />were inserted for each patient. After 3 months of installation, the patients were equally divided into<br />two groups; group I receiving overdentures retained with ball attachments and group II receiving<br />telescopic retained overdentures. Muscle activity was measured at time of denture insertion, two<br />weeks and one month after insertion.<br />Results: The results revealed that muscle activity was significantly lower in telescopic retained<br />overdentures compared to overdentures retained with ball attachments.<br />Conclusion: Telescopic attachments decreased the effort exerted by the muscles compared to<br />ball and socket attachments.<br /> https://edj.journals.ekb.eg/article_79176_0aaaaee5580e771d2beb75fc1ef7fc05.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001Assessment of the Technical Quality of Root Canal Treatment in Pre-clinical Endodontic Training Comparing Artificial Teeth to Extracted Natural Human Teeth355135587917710.21608/edj.2018.79177ENRuaa A.AlamoudiAssistant Professor of Endodontics, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi ArabiaOmarFahimProfessor of Endodontic, Cairo Egypt, Faculty of Oral & Dental Medicine, Cairo UniversityJournal Article20200326Introduction: Extracted natural human teeth were used exclusively for preclinical endodontic<br />training. However, an alternative method involves the use of artificial teeth aiming to overcome<br />the limitations in natural teeth. This study aimed to radiographically evaluate the technical quality<br />of preclinical single root canal treatments performed by undergraduate dental students using two<br />alternative models; artificial teeth and extracted natural human teeth.<br />Materials and methods: Cross-sectional study, 228 single rooted teeth in academic years<br />2017- 2018 were obtained from the preclinical practice of undergraduate program in endodontics<br />at the school of dentistry, King Abdulaziz University, Jeddah, Saudi Arabia. Four observers were<br />asked to independently evaluate the radiographic quality of the root canal fillings according to three<br />parameters: Filling length, density (homogeneity), and taper of the filling in the root canals.<br />Results: There were no significant correlation between the type of teeth and all three parameters;<br />length, density, and taper of the root canals fillings. In addition, there was no statistically significant<br />difference between adequacy of the root canals fillings and the type of teeth (P. value: 0.455).<br />Extracted natural human teeth showed overall 10% adequate filling, 77.7% moderately filling,<br />and12% poorly filling. Meanwhile, artificial plastic teeth showed overall 13% adequate filling,<br />81.6% moderately filling, and 5% poorly filling.<br />Conclusion: Artificial teeth might be suitable for preclinical endodontic training but cannot<br />totally substitute the requirement to learn with extracted natural human teeth as part of preclinical<br />endodontic training. They could be incorporated with natural teeth.<br /> https://edj.journals.ekb.eg/article_79177_987732c6146cf777cb55268319d125bc.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001Bond strength of hard and soft relining materials to thermoplastic monomer free microcrystalline polymer ( In-vitro comparative study)355935667917810.21608/edj.2018.79178ENHala MohamedAbd El HameedAsist Prof. of Prosthodontics, Faculty of Dentistry Suez Canal UniversityEman HusseinyMohamedLecturer of Prosthodontics, Faculty of Dentistry Suez Canal UniversityJournal Article20200326Purpose analysis of bond strength of various denture relining materials to recently introduced<br />thermoplastic monomer free semi rigid microcrystalline polymer and heat cured denture base<br />materials.<br />Materials and methods: designed with cylindrical –shaped silicon patterns with dimensions<br />20 mm in length and 8mm in diameter. Samples branched into four groups(20 samples for each<br />group):<br />GI: heat cured acrylic resin samples with hard relining material, GII: heat cured acrylic resin<br />samples with soft relining material. GIII: thermoplastic monomer free semi-rigid microcrystalline<br />polymer (karadent) samples with hard relining material, GIV: thermoplastic monomer free semirigid<br />microcrystalline polymer samples with soft relining material .<br />Tensile and shear bond strength of hard & soft reliner to the two denture base materials<br />examined by Instron Universal Testing Machine . Multiple group comparisons was assisted by<br />one-way ANOVA test followed by T- test for pair wise comparisons to estimate any significant<br />differences between groups. The tests deemed significant when p ≤ 0.05 and highly significant<br />when p ≤ 0.001.<br />Results: Highly significant differences for both tensile and shear bond strength mean values<br />was found between groups regarding the mean applied loads, P-value ≤ 0.001. The t- test for<br />comparison showed a extremely significant variance in the mean tensile & shear bond strength<br />between groups. Hard relining material showed greater mean values of both shear and tensile bond<br />strength regarding the heat cured denture base material (GI) followed by karadent one (GIII) . The<br />lowest mean values was found in soft relining material, specially that with karadent denture base<br />material ( GIV) for both shear and tensile bond strength.<br />Conclusion: supporting on the results of this research, it might be terminated that newly<br />introduced thermoplastic monomer free semi rigid microcrystalline polymer successfully accept<br />relining specially with hard relining material .It overcomes the main problems of thermoplastic<br />resins that can’t accept relininghttps://edj.journals.ekb.eg/article_79178_69c066e6aebfd920c354e8673b9249f4.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001Evaluation of Debris Extrusion and Smear Layer Production Following Preparation Using Three Different Nickel Titanium Files356735747917910.21608/edj.2018.79179ENReem AdelAbdelgawadAssistant Professor of Endodontics, College of Dentistry, Taibah University, Medina, Saudi Arabia, Lecturer of
Endodontics, Faculty of Dentistry, Suez Canal University, Ismailia,EgyptBassem MohamedEidAssistant Professor of Endodontics, Al-Farabi College of Dentisrty and Nursing, Jeddah, Saudi Arabia, Lecturer of
Endodontics, Faculty of Dentistry, Al-Ahram Canadian University, Giza, EgyptJournal Article20200326Objectives: The aim of this study was to compare the amount of apically extruded debris and<br />the patterns of smear layer formation following the preparation of root canals in extracted human<br />teeth using ProTaper Next, Twisted file, and a reciprocating single-file system.<br />Material and Methods: Forty-five freshly extracted human single-rooted maxillary incisors<br />were divided into 3 groups (n=15) then instrumented using Protaper Next, Twisted files, and<br />Reciproc. The extruded debris were collected in a pre-weighed Eppendorf tubes. The tubes were<br />stored in an incubator at 70 °C for 2 days before weighing the dry debris using analytical balance.<br />The debris weight was determined by subtracting the initial weight from the final weight. Root<br />samples were splitted longitudinally into two halves by making grooves then root halves (cervical,<br />middle and apical) thirds were examined using Environmental Scanning Electron Microscope<br />ESEM (FEI Quanta 250 FEG, Berlin, Germany) at ×1500 magnification. All the data were subjected<br />to statistical analysis using Chi-squared, Fisher`s Extract.<br />Results: The three tested rotary nickel titanium files produced comparable amount of debris<br />extrusion and smear layer patterns covering the root canal dentin walls. Apical third showed the<br />heaviest accumulation of smear layer.<br /> https://edj.journals.ekb.eg/article_79179_a6b2843021e3ecac276a99908ca0a9da.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001Color Modifying Effect of Resin Infiltrant (icon) Versus Adhesive Resin on Aesthetic Correction of Enamel White Spot Lesion: RCT357535817918010.21608/edj.2018.79180ENRaniaMosallamAssociate Professor of Conservative Dentistry Department, Faculty of Oral and Dental Medicine, Cairo UniversityHossamEl MandouhAssociate Professor, Conservative Dentistry Department, Faculty of Dentistry, Suez Canal UniversityOsamaMosallamResearcher in Restorative Dentistry and Dental Material Research Department, National Research Centre, Giza,
EgyptJournal Article20200326Objectives: Resin infiltration is an innovative approach for enhancing the esthetic appearance<br />of white spot lesions (WSLs). The aim of this study was to compare the effect of both resin infiltrant<br />(ICON) and adhesive resin with respect to esthetic improvement.<br />Methods: A randomized controlled split- mouth clinical trial was conducted on 10 young<br />adults with at least two non-cavitated white spot lesions in esthetic zones. They were randomly<br />assigned to two treatment groups: resin infiltrant (Icon, pre-product: DMG) or AdperTM single<br />bond 2 adhesive system (3M ESPG dental product, USA) application after 15% hydrochloric acid<br />(HCL) etching and dehydration with ethanol. Vita Easyshade V (Vita Zahnfabrik, Bad Sackingen,<br />Germany) spectrophotometer was used to measure the CIELAB coordinates and values were used<br />to calculate difference in color (ΔE). Data were tabulated and statistically analyzed using computer<br />software SPSS.<br />Results: There was a statistically significant decrease in both (ΔL) and (Δa) with increase in<br />(Δb) with ICON application (p<0.05). Regarding adhesive resin, there was a significant decrease in<br />both (ΔL) and (Δa) coordinates with non-significant change in (Δb). Also, there was a statistically<br />significant difference between ICON and adhesive resin regarding (ΔE).<br />Conclusions: Color change of white spot lesion treated with ICON and adhesive resin was<br />clinically obvious after treatment with hydrochloric acid. However, ICON reported significant<br />results in esthetic improvement in all color parameters.<br /> https://edj.journals.ekb.eg/article_79180_12ef8c0400d970010a984e74e74c12bb.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001EFFECT OF SILANIZED ZIRCONIA ON SOME MECHANICAL PROPERTIE S OF HEAT -POLYMERIZED POLY METHYLMETHACRYLATE DENTURE BASE MATERIAL358335927918110.21608/edj.2018.79181ENHend EElkafrawyLecturer of Dental Biomaterials, Faculty of Dentistry, Tanta University, EgyptNancy SFarghalLecturer of Dental Biomaterials, Faculty of Dentistry, Tanta University, EgyptJournal Article20200326Objective: The purpose of this work was to study the effect of addition of silanized zirconia<br />powder on flexural strength, deflection, modulus, toughness and micro-hardness of heat-polymerized<br />poly methyl methacrylate (PMMA) denture base resin.<br />Materials and Methods: One hundred specimens of heat-polymerized PMMA were prepared<br />for flexural and hardness tests, fifty for each. Zirconia (ZrO2) powder was treated with silane<br />coupling agent then added to acrylic powder in percentage of 0%(control), 0.5%, 1%, 2% and 5%<br />by weight. Specimens for flexural test were prepared in the shape of flat strips with dimensions of<br />(65×10×2.5mm) using compression molding technique. Flexural test was performed by three-point<br />bending test using universal testing machine. Flexural strength, flexural deflection, flexural modulus<br />and toughness were obtained from the software of the testing machine. Specimens for microhardness<br />test were prepared in dimensions of (10×10×3mm). Micro-hardness was determined<br />using Vickers Micro-hardness Tester. Digital microscope was used to capture photomicrographs<br />at x500 magnification of the surface of randomly selected specimen for each group to show the<br />distribution of different percentages of zirconia. One-way Anova followed by Scheffe’s post hoc<br />multiple comparison test was performed with 5% level of significance for testing the significance<br />between the means of tested groups.<br />Results: There is a significant difference among the mean values of flexural deflection, flexural<br />modulus, toughness and micro-hardness (P<0.05%). The mean values of flexural strength were not<br />significantly different (P>0.05%). The digital microscope has shown nearly even distribution of<br />zirconia particles within the acrylic matrix at 0.5% and 1%, while clusters started to form at 2%,<br />and 5% zirconia.<br />Conclusion: Silanized zirconia powder could be used to improve the properties of heatpolymerized<br />acrylic denture base resin. The most appropriate percentages were 1% and 2%.<br /> https://edj.journals.ekb.eg/article_79181_44a7fdea48ad84437856c75f433612f2.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001Surface Roughness, Hardness, Color Stability, Water Sorption and Water Solubility of PMMA Denture BaseMaterial Reinforced with SynthesizedInorganic, Organic, and Hybrid Nanofibers359336087922410.21608/edj.2018.79224ENUsama MAbdel-KarimAssistant Professor, Department of Dental Biomaterials, Director of Research Lab, Faculty of Dentistry, Tanta
University, Tanta, Egypt.Samy MEl-SaftyLecturer, Department of Dental Biomaterials, Faculty of Dentistry, Tanta University, EgyptEl-RefaieKenawyProfessor, Department of Chemistry, Director of Technology Transfer office, Faculty of Science, Tanta University,
Tanta, Egypt.Journal Article20200326Objective: The objective of the study was to assess surface roughness, microhardness, color<br />stability, water sorption and water solubility of polymethyl methacrylate (PMMA) denture base resin<br />reinforced with inorganic {silanized ZrO2}, organic {Bisphenol A diglycidyl ether dimethacrylate<br />(Bis-GMA)+Triethylene glycol dimethacrylate (TEGDMA)+Polyethylene glycol dimethacrylate<br />(PEGDMA)} and hybrid {silanized ZrO2+Bis-GMA+ TEGDMA} Nanofibers.<br />Materials and Methods: The study was divided into four groups according to the added<br />nanofibers (6wt%) to heat curing PMMA denture base material; Control group: PMMA denturebase<br />material without reinforcing nanofibers, Inorganic group: PMMA denture-base material with<br />silanized ZrO2 nanofibers, Organic nanofibers group: PMMA denture-base material with Bis-GMA/<br />TEGDMA/PEGDMA nanofibers and, Hybrid nanofibers group: PMMA denture-base material with<br />silanized ZrO2/Bis-GMA/TEGDMA nanofibers. For each group, 10 specimens were prepared and<br />tested for surface roughness, microhardness, water sorption and water solubility. For each group<br />11 specimens were prepared and tested for color stability. Surface roughness was measured by<br />optical method. Digital Microhardness tester was used to measure Vickers microhardness. Color<br />stability was evaluated according to ISO/FDIS 20795-1 and ISO 7491, using a Portable Reflective<br />Spectrophotometer. Water sorption (WSP) and water solubility (WSL) were performed according<br />to ISO/FDIS 20795-1. One-way ANOVA was used for comparison between groups and Post-Hoc<br />test (Tukey’s tests) was used for multiple comparisons. P-value different.<br />Results: One-way ANOVA revealed insignificant differences between the studied groups in<br />surface roughness (p=0.168) and color stability (p=0.806). Significant differences were found in microhardness (p=0.000), WSP (p=0.000) and WSL (p=0.000). Post-Hoc (Tukey’s test) revealed<br />that: 1) microhardness means of nanofibers-reinforced groups were markedly significantly higher<br />than control group (p=0.000). 2) WSP of organic nanofibers reinforced group was significantly<br />lower than that of control (p=0.008), hybrid (p=0.001) and inorganic (p=0.000) groups that were<br />not significantly different from each other (p≥0.243). 3) WSL of ZrO2 nanofibers reinforced group<br />was significantly higher than control, organic, and hybrid groups (p=0.000). However, the control<br />group was not significantly different from organic (p=0.992) and hybrid (P=0.018) groups. Organic<br />group was significantly lower than hybrid group(p=0.009).<br />Conclusions: Addition of 6% nanofibers prepared by electrospinning technique to PMMA<br />denture resin significantly enhanced microhardness. Surface roughness and color stability were not<br />affected. Water sorption was significantly reduced with organic nanofibers, but was not affected with<br />ZrO2 and hybrid nanofibers. The highest water solubility for nanofibers reinforced groups recorded<br />in this study was (0.46±0.04μg/mm3) which is nearly one third of the ISO limit (1.6μg/mm3).https://edj.journals.ekb.eg/article_79224_59cb31d5b21d61e810a5120d652d039f.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001Randomized controlled clinical trial of implant overdenture retained with zirconia bars or telescopic crowns: a 1-year follow-up360936217922510.21608/edj.2018.79225ENMahmoud GamalSalloumAssistant Professor Prosthetic Dental Science Dept., College of Dentistry, Jouf University, KSA.Moustafa OmranHussienAssociate Professor of Prosthodontics, Faculty of Dentistry Qassim University , K.S.AJournal Article20200326Implant retained overdenture is a popular treatment for edentulous patients whether splinted or<br />solitary attachments were used. The aim of the study was to examine the difference between bar<br />and telescopic overdenture attachment fabricated from zirconia. Ten male patients were selected<br />to receive implant overdenture retained by two implants at para-sympheseal zone. These patients<br />were categorized into two groups based on the type of attachment used. Group (A) was the barconnected<br />group while group (B) was the telescopic attachment group. Both bone height and bone<br />density were monitored, using cone beam computerized tomography, throughout the follow up<br />periods (at loading time, three, six and twelve months). The results showed the mean values of<br />peri-implant bone height loss of group A were less than group B with statistically significant values<br />(P< 0.05). The mean values of the bone density showed higher bone density values in group A than<br />group B with statistically significant value at (P < 0.05). It could be concluded that the zirconia<br />bar-attachment overdenture showed better treatment outcomes than zirconia telescopic attachment.<br />Accordingly, the bar-clip attachment system showed some preference in preserving peri-implant<br />bone surround the implants.https://edj.journals.ekb.eg/article_79225_a2a98ff4291b0d257ef8eb82c6bd255d.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001A clinical evaluation of retention of maxillary complete CAD/CAM and conventional dentures362336307922610.21608/edj.2018.79226ENShereen MKabeelLecturer of Removable Prosthodontics, Faculty of Dental Medicine for Girls, Al-Azhar UniversityDina MKholiefAssistant Professor of Removable Prosthodontics, Faculty of Dental Medicine for Girls, Al-Azhar University.Journal Article20200326Background: Computer-aided design (CAD)/computer-aided manufacturing (CAM) dentures<br />are suppose to have more favorable material properties than conventional heat - cured acrylic<br />dentures, among them a lesser methacrylate monomer release.<br />The purpose of this clinical study: Was to evaluate the retention quality of conventional heatcure<br />acrylic denture bases and digitally milled maxillary complete denture bases.<br />Material and methods: This study was done on six edentulous patients; CAD/CAM dentures<br />were constructed from six different master casts by using CAD/ CAM system. Conventional heatcure<br />acrylic dentures acted as a control group. Universal testing machine was used to measure the<br />retention of the denture. Every denture base was subjected to a slowly increasing vertical load until<br />the denture was totally out of place 5 times at 10-minute intervals. The average retention of the two<br />assemble methods was analyzed using Independent t-test & Paired t-test.<br />Results: CAD/CAM denture showed statistically significant higher mean retention value than<br />conventional denture at insertion and after one-month (P value<0.000, <0.000) respectively.<br />Conclusion : Compared with the traditional manual method, the retention of the maxillary<br />complete denture prepared using the CAD/CAM method for the edentulous alveolar ridge was<br />significantly higher, meaning that the CAD/CAM method can meet the clinically acceptable<br />precision for design and development of complete dentures as trial for restoring edentulous jaws.<br /> https://edj.journals.ekb.eg/article_79226_0a07c0f8ac29d78240a57ad960f147c0.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001Comparative study between bone height changes around implants placed using stereolithographic versus conventional surgical guides363136407922710.21608/edj.2018.79227ENAzza FarahatMetwallyAssociate Professor, Removable Prosthodontic Department, Faculty of Dentistry, Cairo University, Egypt.Amal AliSwelemAssociate Professor, Removable Prosthodontic Department, Faculty of Dentistry, Cairo University, Egypt.Journal Article20200326Background: Accuracy of implant placement using computer designed surgical guides as<br />compared to conventional laboratory-processed guides has been investigated by many researchers.<br />However there are no published articles on the effect of placing dental implants using computerdesigned<br />guides on bone height changes around the implants as compared to those placed using<br />conventional guides.<br />Purpose: The aim of this study was to compare between bone height changes around dental<br />implants placed using stereolithographic surgical guides versus conventional guides in completely<br />edentulous patients rehabilitated with 2-implant supported mandibular overdentures opposed by<br />conventional maxillary complete dentures.<br />Methods: This parallel randomized controlled trial (RCT) included 14 participants (age ranging<br />from 50-60) with a mean age of 56.7 years who were selected based on specific inclusion criteria.<br />Conventional maxillary and mandibular compete dentures were constructed for all participants who<br />were then randomly divided into two equal groups (7 participants in each). All participants received<br />two implants, 3.5 mm in width and 10 mm in length, in the mandibular inter-foraminal areas<br />(canine region). However implants in Group I (Control) were placed using a conventional surgical<br />guide while implants in Group II (Experimental Group) were placed using a stereolithographic<br />surgical guide. After implants’ osseointegration, all participants received ball attachment- retained<br />mandibular overdentures. Bone height changes around the installed implants were evaluated with<br />the aid of cone beam computed tomography (CBCT) scans. Measurements were recorded three<br />times at 0 months, 6 months and 12 months after overdenture insertion and the changes were<br />calculated and statistically analysed. Statistical significance was set at 5 %.<br />Results: All participants attended all follow up visits with no drop outs. None of the implants<br />was lost presenting a 100% survival rate for both groups. After 6 months post-insertion, the mean<br />bone loss was 0.32mm and 0.31mm for groups I and II respectively. After 12 months post- insertion,<br />mean bone loss reached 0.61mm and 0.49mm for groups I and II respectively. There were no<br />statistically significant differences between the two groups at both (6 and 12 months) follow-up<br />periods.<br />Conclusion: Bone height changes around implants placed with stereolithographic surgical<br />guides versus conventional guides were statistically insignificant with no relevant superiority of<br />one guide over the other. Both surgical guides provided clinically successful implant treatment with<br />a 100% survival rate for both groups during the one-year follow-up period.https://edj.journals.ekb.eg/article_79227_7859d4971036c8e45c5eec34a4d808ce.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001Immediate versus Delayed Implant placement in Diabetic Patients rehabilitated with Mandibular Overdentures – A Split mouth study364136507922810.21608/edj.2018.79228ENDina Mohamed AhmedElawadyLecturer, Prosthodontist, Department of Removable Prosthodontics Faculty of Dentistry, Modern Science and Arts
University (MSA), EgyptReham B.OsmanLecturer, Prosthodontist, Department of Removable Prosthodontics, Faculty of Oral and Dental Medicine, Cairo
University, Egypt.Journal Article20200326Purpose: This comparative controlled trial (CCT) evaluates the survival rate of implants placed<br />into fresh extraction sockets and compare it with implants placed in healed sites in type 2 diabetic,<br />completely edentulous subjects rehabilitated with mandibular implant overdentures (MIODs) following<br />a delayed loading protocol and opposed with conventional complete dentures.<br />Materials and Methods: Fourteen implants were placed in seven well-controlled diabetic<br />subjects as determined by Glycosylated hemoglobin (HbA1c) values before implant placement<br />(baseline) and throughout the follow-up period. Each patient received two implants; one implant in<br />healed canine site and the other was immediately inserted following the extraction of an existing<br />periodontally hopeless canine. The implants were uncovered approximately 3 months after placement<br />and restored with bar-retained overdenture. The patients were scheduled for regular follow-up<br />appointments and for data collection. Kaplan-Meier analysis was used to calculate implant survival<br />from time of prosthesis placement through 24-month follow-up period.<br />Results: No implant failed in the delayed placement group within the 2 years study period,<br />whereas in the immediate group two implants failed in two patients following the prosthetic loading<br />at one-year follow-up period resulting in 71.2% implant survival rate. HbA1c levels ranging from<br />7.4 to 8.0 percent were identified in two patients with implant failures. There was no statistically<br />significant difference in survival rate between immediate and delayed implants in type 2 Diabetic<br />subjects rehabilitated with MIOD s (P=0.141).<br />Conclusions: Within the limitations of this study, insufficient evidence exists to recommend<br />immediate implant placement in type 2 diabetic subjects rehabilitated with MIODs.<br /> https://edj.journals.ekb.eg/article_79228_acae0a28bf9bac40247705b3e548435e.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001Wear resistance of nano silica modified acrylic denture teeth and nano filled composite denture teeth365136597922910.21608/edj.2018.79229ENMohamed MahmoudAbdallaDepartment of Dental Biomaterials, Faculty of Dental Medicine, Al-Azhar University Cairo (Boys)Muhammad AbbasMasoudDepartment of Dental Biomaterials, Faculty of Dental Medicine, Al-Azhar University Cairo (Boys)Journal Article20200326Artificial denture teeth are subjected to wear from daily masticatory functions. This wear<br />affects the denture esthetics, functions and in turn results in patient discomfort. The purpose of<br />this study was to evaluate the wear resistance of nano composite fabricated artificial denture teeth<br />and conventional acrylic denture teeth reinforced with silica nano particles. A total number of<br />60 samples were used. Samples were divided into equal four groups (n=15). The first group was<br />fabricated from nano filled composite. The second and third groups were silica nanoparticles<br />modified acrylic denture teeth with two different concentrations 0.1% and 10% respectively. The<br />fourth group was conventional acrylic resin denture teeth and served as a control. The 2-body<br />wear testing was performed with a multi-modal ROBOTA chewing simulator. Wear was then<br />evaluated by the means of weight loss and surface roughness. The nano-composite group recorded<br />significantly higher wear resistance than conventional and silica modified acrylic resin groups. The<br />silica modified acrylic resin group with 0.1% concentration recorded a lower surface roughness<br />than any of the other groups. In conclusion; Nano-composite teeth can be used as artificial denture<br />teeth exhibiting significant higher wear resistance than conventional and silica modified artificial<br />acrylic teeth.https://edj.journals.ekb.eg/article_79229_ce6927e6816cf82ec94ab075dad5a786.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001THE EFFECT OF REMAINING CORONAL DENTIN WALL THICKNESS ON FRACTURE RESISTANCE OF ENDODONTICALLY TREATED TEETH RESTORED WITH POST AND CORE366136717923010.21608/edj.2018.79230ENMohamed Mohey EldinMohamedLecturer of Fixed Prosthodontics, Delta University For Science and TechnologyJournal Article20200326Objectives. The aim of this study was to evaluate the effect of the remaining coronal wall<br />thickness of dentin on fracture resistance of endodontically treated anterior tooth restored by cast<br />post and glass fiber post and core.<br />Materials & Methods. A total number of 100 human maxillary central incisors were collected<br />and stored in an isotonic saline solution at room temperature until used. Teeth were randomly<br />divided into 3 main groups control group (CG), group A and B. Control group 20 endodontically<br />treated teeth (ETT) without post and core fabrication restored with full metal crown.<br />Group A, 40 ETT restored by custom made casted metal post and core.<br />Group A, subdivided into subgroup A1, subgroup A2 of 20 ETT and restored with metal crown<br />of 0.5mm and 1.0mm finish line width respectively.<br />Group B, 40 ETT restored by glass fiber post and composite core. Group B, subdivided into<br />subgroup B1, subgroup B2 of 20 ETT and restored with metal crown of 0.5mm and 1.0mm finish<br />line width respectively. The prepared specimens were subjected to load testing using a universal<br />testing machine. The fracture pattern was observed and fracture load results were then statistically<br />analyzed using One-way analysis of variance (ANOVA ) in SPSS software.<br />Results. The highest mean fracture load of 991.5±54.1 N for The control group CG followed<br />by group A1 with a mean of 780.2±67.8 N and group A2with a mean of 521.5± 96.8 N then group<br />B1 with a mean of 489.24 ±30.61 N and the lowest mean fracture load of 388.32± 29.45 N was for<br />group B2.<br />Conclusion. The thickness of remaining coronal dentin affects the fracture resistance of<br />endodontically treated teeth received both casted metal and fiber post and core significantly.<br /> https://edj.journals.ekb.eg/article_79230_a9d8c33fb163addbd9905d81731bf9c5.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001Effect of Soft Liner Female Housings Retaining Mandibular Two Implant-Supported Overdentures on Hand Grip Strength and Patient Satisfaction in Egyptian Males367336827923110.21608/edj.2018.79231ENElsayed A.Abdel-KhalekLecturer of Removable Prosthodontics, Faculty of Dentistry, Mansoura University, Egypt.Journal Article20200326Introduction: Loss of natural teeth could make food consumption very difficult and leads<br />to malnutrition that is associated with muscle wasting. It is well known that implant-supported<br />mandibular overdentures increase the functional outcome, masticatory performance, nutritional<br />status and patient’s satisfaction compared with conventional complete dentures. The study aimed<br />to evaluate the satisfaction and hand grip strength (HGS) for patients treated with two implantsupported<br />mandibular overdentures retained by soft liner female housings with either bar or ball<br />attachments and opposed by maxillary conventional dentures.<br />Materials and Methods: Twenty-one completely edentulous Egyptian males were selected<br />with a mean age of 59.4 years and ranged between 53 and 67 years. Patients were allocated<br />randomly into two groups: Group A (n=12) patients received Hader bar design connecting both<br />implants in a straight line with soft liner female housing to retain the overdentures. Group B<br />(n=9) patients received two ball patrices with soft liner female receptacles to retain the implant<br />overdentures. Patient satisfaction was measured by using 100 mm VA S questionnaire and Hand<br />grip strength (HGS) was recorded by using handheld JAMAR dynamometer. Patients were recalled<br />for measurements at baseline with conventional dentures before implant placement (T0) and then<br />6 months (T6) and 12 months (T12) after overdenture insertion. All statistical tests were 2-tailed at<br />the 5% level of significance.<br />Results: From the pairwise statistical analysis, it was noticed that significant satisfaction VAS<br />values for bar group were higher in comparison to ball group in relation to retention and stability.<br />Bar group revealed significantly higher HGS values from the baseline, while, Ball group exhibited<br />no significant differences between times of observation.<br />Conclusion: Overdentures retained by soft liner around Hader bars splinting two implants may<br />be beneficial for edentulous patients with impaired nutritional status manifested by weak hand grip.https://edj.journals.ekb.eg/article_79231_b92427168ff20a7b247c2318d1ca0246.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001Topographic Changes Of Two different Ni Ti File Systems After Multiple Uses368336967923310.21608/edj.2018.79233ENSoliman M.KamhaLecturer of Endodontics, Faculty of Dentistry, Pharos University In AlexandriaJournal Article20200326Aim: To study the topographic changes of protaper Next and Two Shape NiTi file systems after<br />three uses.<br />Materials and Methods: Four sets of Protaper Next and four sets of Two Shape files were<br />used to prepare MB canals of mandibular first molars. Twenty four mandibular first molars with<br />nearly similar lengths (20 to 22 mm) and the mesiobuccal canals with curvature ranged from 20o -<br />40o were used. All teeth were subjected to access cavity, MB canal localization, WL determination<br />and the teeth were randomly assigned to two groups, twelve for each according to the type of NiTi<br />rotary files used. Group I, twelve MB canals were prepared by using the four sets of Protaper Next<br />NiTi rotary files. Group II, twelve MB canals were prepared by using the four sets of Two Shape<br />NiTi rotary files. Every set prepare three canals. All sets of Protaper Next including X1 & X2 and<br />Two Shape including TS1 & TS2 were scanned under SEM before and after canal preparation in<br />the same position at three parts: apical part, middle part and the critical point (3-5 mm from the file<br />tip) and photographed. No visible defects, pitting, corrosion, fretting, micro cracks, fractures, metal<br />strips, spiral distortion, blunt cutting edges, disruption of cutting edges or fatigue cracks were the<br />criteria of surface deformations of files. All deformations were tabulated and compared before and<br />after root canal preparation.<br />Results: PTN sets: one X1 showed disruption of cutting edges before and after use, one X1<br />showed disruption of cutting edges after use, two X1 and four X2 files showed no visible defects.<br />TS sets: one TS1 showed disruption of cutting edges before and after use, three TS1 showed no<br />visible defects. One TS2 showed pitting before and after use, one TS2 showed corrosion after use,<br />one TS2 showed disruption of cutting edges and micro cracks after use and one TS2 showed no<br />visible defects.<br />Conclusion: Based on the results of this study, it is safe to instrument up to three curved canals<br />by PTN or TS rotary NiTi files without file fracture.<br /> https://edj.journals.ekb.eg/article_79233_cea1cfa04463feb27fad587dead1463c.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001Effect of Two Different Cleansing Agents on Color Stability of Thermoplastic Denture Base Material369737027923510.21608/edj.2018.79235ENTamer M. NasrMostafaLecturer, Psosthodontic Department, Faculty of Dentistry, Tanta University, Tanta, EgyptJournal Article20200326Purpose: Researchers tried to improve the mechanical properties of poly methyl methacrylate<br />(PMMA) denture bases. Development of alternative materials such as thermoplastic denture base<br />materials as polyamide had also been reported in the literature, however, it has not been well studied<br />regarding color stability. The aim of this in vitro study was to evaluate the effect of two different<br />cleansing agents on color stability of thermoplastic denture base material. Materials and methods:<br />Thirty samples were fabricated from polyamide (Vertex Thermosens thermoplastic denture base<br />material). Samples were divided into Three groups: 10 each. Group I (control group): soaked in<br />distilled water, Group II: soaked in Corega cleansing agent and Group III: soaked in Efferdent<br />cleansing agent. Results: Statistical non-significant results were found. A slight non-significant<br />effect on color stability was found more with Efferdent than Corega cleansing agent and water.<br />Conclusion: Disinfecting polyamide denture base material (Vertex Thermosens) could be done<br />safely with Corega and Efferdent cleansing agents.<br /> https://edj.journals.ekb.eg/article_79235_42be96b99f433a89210500834b131ed2.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001Remineralization of initial enamel like lesions with chicken Egg Shell powder solution versus Amorphous Calcium Phosphate370337127923710.21608/edj.2018.79237ENHebatallah MTaherAssociate Professor of Restorative Dentistry, Cairo University and Modern Sciences and Art in EgyptRania EBayoumiLecturer, Biomaterials Department, Faculty of Dentistry (girls), El-Azhar UniversityJournal Article20200326Aim: To compare the efficacy of chicken egg shell solution powder (CESP) and amorphous<br />calcium phosphate (ACP) on the remineralization of enamel subsurface lesions.<br />Materials and Methods: Twenty bovine central incisor teeth were used in this study. The<br />microhardness and the minerals content of all specimens were initially assessed using Vickers<br />hardness tester and EDXA respectively (positive control group).The specimens were artificially<br />demineralized and then reassessed directly after demineralization (negative control group). All<br />demineralized specimens were randomly classified into 2 equal groups,group I :treated with Chicken<br />eggshell powder solution (10 specimens), while, groupII: treated with ACP (10 specimens). The<br />remineralizing agent were applied twice daily for 15 min each for seven successive days. Finally all<br />specimens were reassessed for minerals content (Ca and PO4 weight %) and surface microhardness.<br />The data were statistically analyzed using repeated measures analysis of variance (ANOVA ), the<br />significance level was set at P ≤ 0.05.<br />Results: Microhardness was significantly decreased in all specimens after demineralization<br />and then it was significantly increased after exposure to therapeutic solutions. There was a<br />significant increase (P<0.001) in both Calcium and Phosphorus levels after remineralization using<br />both agents, as detected by EDAX. However, there was no significant difference between the two<br />remineralized groups.<br />Conclusions: Within the limitations of this in vitro study, it can be concluded that both<br />remineralizing agents were similarly able to increase the microhardness and tooth remineralization.<br />However, being natural products, CESP can be considered as an optimal alternative to the<br />commercial ones.<br /> https://edj.journals.ekb.eg/article_79237_bdb3396a778f92391590856c0199bfc6.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001Accuracy of implant placement using three different surgical guides371337217923910.21608/edj.2018.79239ENMahaNagiLecturer, Removable Prosthodontics Department, Faculty of Dentistry, British University in EgyptJournal Article20200326Aim of the study: This study was done to evaluate and compare the accuracy of implant<br />placement using three differently constructed surgical guides (3D printed, laser sintered and CAD/<br />CAM milled surgical guides).<br />Materials and Methods: Eighteen implants were placed in partially edentulous patients having<br />maxillary bounded edentulous areas. Based on the method of construction, patients were divided<br />into three groups: group I, received 3D printed surgical guides, group II: received laser sintered<br />surgical guides and group III: received CAD/CAM milled surgical guides. Implant placement<br />evaluation included the difference between the planned and the actual implant sites regarding<br />the point of implant insertion (coronal deviation), apex position (apical deviation), and implant<br />angulation (angular deviation)<br />Results: The highest deviation values were obtained from group III (CAD/CAM milled surgical<br />guides) followed by group II (laser sintered surgical guides), while group I (3D printed surgical<br />guides) showed the least deviation values. There was a statistically significant difference between<br />group I (3D printed surgical guides)) and group III (CAD/CAM milled surgical guides) regarding<br />coronal deviation and apical deviation, also there was a statistically significant difference between<br />group II (laser sintered surgical guides) and group III (CAD/CAM milled surgical guides) regarding<br />coronal deviation and apical deviation, while there was no statistically significant difference between<br />group I (3D printed surgical guides) and group II (laser sintered surgical guides), besides there was<br />no statistically significant difference between the three groups regarding angular deviation.<br />Conclusion: 3D printed surgical guides had the best accuracy (minimal deviation) followed<br />by laser sintered surgical guides and the least accurate were the CAD/CAM milled surgical guide<br /> https://edj.journals.ekb.eg/article_79239_1402765d5344527665c780051dec95b0.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001THE EFFECT OF MAGNETIC AND CM LOCK ATTACHMENTS ON STRAIN AROUND IMPLANTS RETAINED MANDIBULAR OVERDENTURE: A STRESS ANALY SIS STUDY372337317924110.21608/edj.2018.79241ENNadaEl KhourazatyLecturer of Removable Prosthodontics, Faculty of Dentistry, Cairo University.Journal Article20200326Objectives: This in-vitro strain gauge study was conducted to compare between magnetic and<br />CM lock attachments regarding strain induced around two implants supporting a mandibular over<br />denture.<br />Methodology: This study was performed using two implants 3.7mm x 12mm installed at the<br />canine area bilaterally in an acrylic model resembling a completely edentulous mandible. Pick<br />up of the magnetic and CM loc attachments was done followed by loading and measurements<br />respectively. The strain induced around the implants was evaluated during unilateral and bilateral<br />loading at the first molar area using a universal testing machine. Measurements were tabulated and<br />statistically analyzed.<br />Results: loading sides demonstrated significantly higher microstrains around the implants with<br />the two attachments than non-loading sides. CM LOC attachment showed significantly higher<br />microstrains than magnetic attachment for both loading and non-loading sides during unilateral<br />loading. During bilateral loading, a statistically significant higher mean micro strain was recorded<br />in the right implant than the left implant, CM lOC have shown a higher statistically significant mean<br />micro strain than the magnetic attachment for the right implant and no siginificant difference in the<br />left implant.<br />Conclusions: Within the limitation of this in-vitro study, it could be conclude that the attachment<br />type could have an effect on the amount of load that will be transmitted to the implants supporting<br />an over denture. Clinical studies are required to evaluate the effect of type of attachment on peri<br />implant crestal alveolar bone loss and correlate it with the results of the current study.<br /> https://edj.journals.ekb.eg/article_79241_71673c74391bfe0d55258fab92f7b22a.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001Effect of splinting on the accuracy of impressions of multiple straight implants in full arch rehabilitation: An in vitro-study373337397924310.21608/edj.2018.79243ENM. ShadyNabhanLecturer of Removable Prosthodontics, Faculty of Dentistry Ain Shams University.Yasmine G.ThabetLecturer of Removable Prosthodontics, Faculty of Dentistry Ain Shams University.Journal Article20200326Objectives: This study was conducted to assess the effect of different splinting techniques<br />(with and without sectioning of the splinting material) on the accuracy of impressions of multiple<br />straight implants in full arch rehabilitation cases.<br />Materials and methods: A maxillary resin printed study model with five straight fixtures was<br />used as the master model. Open tray impression technique was done for all groups. Three groups<br />were defined according to splinting of the impression copings: Group A: Impression copings were<br />splinted to each other using autopolymerizing acrylic resin. Group B: Impression copings were<br />splinted to each other using autopolymerizing acrylic resin which was sectioned with a 0.3 mm<br />thickness disc and reconnected with a second mix of resin. Group C: Impression copings were not<br />splinted to each other. For each group, five different impressions were prepared. The impressions<br />were poured to create the casts that were digitally scanned. The accuracy of the positions and<br />angulations of the implants was evaluated using a computer-graphics coordinate measurement<br />system.<br />Results: Group A showed higher angular deviation compared to group B and group C. One way<br />ANOVA showed statistically significant difference between the studied groups, P value was <0.001.<br />However, Tukey post hock test showed statistically significant difference between group A and the<br />other groups and no statistically significant difference between group B and group C. On the other<br />hand, regarding linear deviation one way ANOVA showed no statistically significant difference<br />between the studied groups.<br />Conclusion: Both split acrylic‑splinted and non-splinted implant impression techniques yield<br />more accurate master casts regarding angular deviation compared to splinted impression technique<br />without splitting.<br /> https://edj.journals.ekb.eg/article_79243_e4f448141bea4931a2d74b66869cf8fd.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001Effect of Silica Coating with Different Luting Cements on the Bond Strength of a Zirconia Based Ceramic374137457924810.21608/edj.2018.79248ENAhmad M.Y.El-KouediAssociate Professor, Crown and Bridge Department Faculty of Dental Medicine for Boys - Al-Azhar University.
Cairo. Egypt.Mohammed H.Abd El-AzizAssociate Professor, Crown and Bridge Department Faculty of Dental Medicine for Boys - Al-Azhar University.
Cairo. Egypt.Journal Article20200326Statement of the problem: Debonding is a common cause of failure in zirconia-based<br />restorations. Despite the use of resin cements and surface treatments, the rate of success remains<br />to be questioned.<br />Purpose: The purpose of this study was to evaluate the effect of surface treatment using a<br />silica coating (Co-Jet) method with different luting cements on the shear bond strength to zirconia<br />samples. The hypothesis was that surface treatment with different luting cements will influence the<br />bond strength at the ceramic-cement interface.<br />Materials and Methods: In this study 30 zirconia samples were constructed and underwent<br />surface treatment using a silica coating method (Co-Jet system). Zirconia samples were then bonded<br />to composite samples using different luting agents (Bifix QM, Panavia 2.0 and Multilink Automix).<br />Samples underwent a thermocycling aging process before shear bond strength was tested.<br />Results: The highest shear bond strength was recorded with the Panavia 2.0 group while the<br />lowest was with the Bifix QM group.<br />Conclusions: Within the limitations of this study, the use of a Co-Jet sand silica coating system<br />with Panavia 2.0 showed superior bond strength than the other luting cements.<br /> https://edj.journals.ekb.eg/article_79248_4f0a41f23491c7b1cd52eae2c371df01.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001Bonding Capacity of a Universal Adhesive in Different Etching Modes to Caries Affected Dentin Prepared by Two Caries Excavation Techniques374737597934710.21608/edj.2018.79347ENNadia M.ZaghloulAssistant Professor, Department of Operative Dentistry, Faculty of Dentistry, Mansoura University.Journal Article20200328Objectives: The aim of the present study was to evaluate and compare the microtensile bond<br />strength (μTBS) and resin penetration into caries affected dentin (CAD), of a universal adhesives<br />applied into two different etching modes (i.e. self-etch or etch-and-rinse), after caries excavation<br />with two methods, Round tungsten carbid bur CB or Carisolv chemomecanical caries removal<br />(CMCR). Materials and Methods: Fourty human third molar teeth with moderate occlusal carious<br />lesions were collected. The selected teeth were cut parallel to the occlusal surface of the tooth to<br />expose the carious lesion. Teeth were divided into two groups (n=20) relative to the caries excavation<br />methods i.e. Group1: Carisolv CMCR and group 2: round (CB). Each group was subdivided into<br />two subgroups (n=10) relative to the applied adhesive mode i.e. subgroup a: the adhesive system<br />was applied in a self-etch mode (SE), while in subgroup b: the adhesive system was used in the<br />etch & rinse mode (E & R). Following the application of the adhesive, Filtek Z350 XT resin<br />composite was applied incrementally onto the CAD. The bonded specimens were thermocycled<br />for 5000 cycles. The restored teeth were sectioned longitudinally to obtain bonded beams for<br />μTBS. Beams were mounted into the universal testing machine. Bond strength, for each subgroup,<br />was calculated and statistically analyzed. After debonding the beams, the fracture surfaces were<br />examined under stereomicroscope to detect the failure modes. One beam, from the area of CAD,<br />from each subgroup was selected for SEM examination. Results: Two-way ANOVA indicated high<br />significances for caries excavation and adhesive modes factors (p <.0001). The highest mean value<br />of μTBS was recorded with CMCR , bonded with E & R mode , followed by CB method, bonded<br />with E & R mode, CMCR bonded with SE and CB and bonded with SE adhesive; respectively.<br />Tukey’s test displayed that there is no significant difference in the μTBS between the groups bonded<br />with E & R adhesives, while CB method bonded with SE mode showed significant decrease in the<br />μTBS value (p < 0.05), with all test groups. All the tested groups showed cohesive failure mode in<br />dentin rather than adhesive. In contrast, CB excavation method with SE mode displayed increased<br />adhesive mode of failure rather than the cohesive and mixed modes. Removal of the caries with<br />both methods and bonding with E & R adhesive resulted in relatively thin hybrid layer, but thicker<br />with CMCR, with moderate distribution of resin tags. SE mode of adhesion showed a relatively<br />thick hybrid layer with short conical shaped resin tags. The dentinal tubules were at most occluded<br />with smear blugs and calcfic precipitates. Conclusions: Based on the limitation of this study, the<br />results showed that the use of Carisolv CMCR does improve the μTBS of universal adhesives to<br />CAD, either in SE or E & R modes.<br /><br /><br />https://edj.journals.ekb.eg/article_79347_e5f548259ea9dec8d2e2736d99e44a76.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001Assessment of adding Nano titanium oxide particles on Biomechanical behavior of High- temperature vulcanized Maxillofacial Silicone Elastomers376137697934910.21608/edj.2018.79349ENMohamed Y.AbdelfattahLecture of Prosthodontics, Prosthodontic Department, Faculty of Dentistry, Tanta UniversityMohamed I.EbrahimAss. Prof of Biomaterial, Biomaterial Department, Faculty of Dentistry, Al Azhar UniversityMohamed A.MohamedAss. Prof of Oral Pathology, Oral Pathology Department, Faculty of Dentistry, Al Azhar UniversityJournal Article20200328Objective: This study assessed the influence of titanium oxide nanofiller incorporation into<br />MDX4-4210 maxillofacial silicone regarding biomechanical changes.<br />Methods: Nano titanium oxide powder (P25, Degussa, Germany) was mixed to hightemperature-<br />vulcanized (HTV) silicone (MDX4-4210, Dow Corning, USA) at 0.2 wt%. For testing<br />the cytotoxicity, two groups of silicone specimens, ten specimens each were prepared. Group A:<br />Blank MDX4-4210 silicone (control group); Group B: Nano titanium oxide powder was added to<br />MDX4-4210 silicone; each group was assessed after 24, 48, and 72 hours. For testing mechanical<br />properties 60 specimens were prepared, 20 for testing tear strength, 20 for testing ultimate tensile<br />strength, and 20 for testing hardness. Each group was subdivided into two identical categories: (I)<br />10 control specimens without nano-titanium oxide, and (II) 10 experimental specimens with nanotitanium<br />oxide powder. The specimens were assessed and one way (ANOVA ) test was utilized to<br />analyze the data.<br />Results: After 24-hour, in the control groups, the cytotoxicity values were higher than those<br />of titanium oxide nanofiller group. There were marked improvements in the mean values of all the<br />tested mechanical properties<br />Conclusion: incorporating nano-titanium oxide particles improves the biocompatibility and<br />mechanical properties of MDX4-4210 maxillofacial silicone materials.<br /><br /><br />https://edj.journals.ekb.eg/article_79349_c6d1ab20d974b0777bd3aa614d536f70.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001Marginal bone height changes around maxillary and mandibular implants supportin g All on four fixed detachable prosthesis. One-year prospective study377137807935010.21608/edj.2018.79350ENAhmad FathallaShawkyAssociate Professor, Department of Removable Prosthodontics ,Faculty of Dentistry, Beni-suef University, Beni-suef, Egypt0000-0002-6000-5976Mohamad Hossam El- DinHelmyLecturer, Department of Removable Prosthodontics, Faculty of Dentistry, Assiut University, Assiut, Egypt.Hebatalla MahmoudEl AfandyLecturer at Prosthodontic Department Faculty of Dentistry , Future UniversityJournal Article20200328Purpose of the study: The aim of the present study was to investigate the marginal bone<br />height changes around maxillary and mandibular implants supporting all on four fixed detachable<br />prosthesis after one year follow up<br />Materials and methods: six completely edentulous patients (4 males and 2 females) received<br />new conventional maxillary and mandibular dentures and were asked to wear them for 3 months<br />to enhance adaptation. Four implants were inserted in the maxillary (between the nasal sinuses)<br />and mandibular (between the mental foramina) arch of each patient according to the All On four<br />protocol. Implants were immediately loaded with provisional dentures after connection of multiunit<br />abutments, and after 3 months of osseointegration temporary dentures were replaced by fixed<br />ceramo-metal prosthesis. Vertical marginal bone loss (VBL) was evaluated at the time of fixed<br />hybrid prosthesis insertion, 6 and 12 months later using standardized peri-apical radiographs.<br />Results: Maxillary anterior implants recorded significant higher VBL (P ≤ 0.005) than<br />mandibular implants after 6 months and 12 months of prosthesis insertion. Also, the maxillary<br />anterior implants showed significant VBL (P ≤ 0.005) than the posterior implants. For the posterior<br />implants, no significant difference in VBL was observed between the maxillary and mandibular<br />implants. For the mandibular implants, no significant difference in VBL between the anterior and<br />posterior implants was observed.<br />Conclusion: Within the limitation of this short-term study, taking the small patient cohort into<br />account, it could be concluded that maxillary anterior implants supporting all on four fixed hybrid<br />prosthesis are at increased risk for marginal bone loss compared to maxillary posterior implants or<br />mandibular implants.<br /><br /><br />https://edj.journals.ekb.eg/article_79350_662385133afc1d5ea0979260d711a7c2.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001Effect of Denture Cleansers on Retention Capability of Different Locator Attachments: In Vitro Study378137887935110.21608/edj.2018.79351ENTamer Mohamed NasrMostafaLecturer, Prosthodontic Department, Faculty of Dentistry, Tanta University Tanta, Egypt.Hesham SamyBorgLecturer. Prosthodontic Department, Faculty of Dentistry, October 6 University, Egypt.Journal Article20200328Purpose: To evaluate the retention capability of three Locator attachments after soaking in<br />three different cleansing solutions.<br />Materials & Methods: Three implants were embedded into acrylic block, Locator abutments<br />were placed onto the implants. 120 locator attachments divided into three groups (40 each): pink,<br />white and purple Locator attachments were soaked in different denture-cleansing solutions: (water<br />as control group, Efferdent, 5.25% Sodium Hypochlorite, Tantum Verde Mouthwash) ten each<br />for a time resembling one year of clinical use. The Locator attachments were tested for load-todislodgement<br />(retentive force; Newton) with a Universal Testing Machine. Data were collected,<br />tabulated and statistically analyzed using Two Way ANOVA test followed by the Tukey’s HSD test<br />(α ≤ 0.05).<br />Results: There were no statistical significant differences between water, Efferdent and Tantm<br />Verde mouthwash (P>0.05) for all types of locator attachments while sodium hypochlorite gave<br />statistical significant lower retention values and retention loss percentage (P< 0.05) than that<br />immersed in other solutions.<br />Conclusions: Within the limitations of this study Efferdent and Tantum Verde mouthwash can<br />be used as denture cleanser while sodium hypochlorite is not recommended.<br /><br /><br />https://edj.journals.ekb.eg/article_79351_aa947f14fb5ae3f1c55725320f11a47d.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001In-vitro assessment of physico-mechanical properti es of nanopartic le glass carbomer378938007935410.21608/edj.2018.79354ENEman Mohamed SobhyElbahrawyLecturer of Dental Biomaterials, Department of Dental Biomaterials, Faculty of Dentistry, Tanta University, Tanta,
EgyptJournal Article20200328Aim: This study was conducted to evaluate and compare the shear bond strength, water sorption,<br />solubility, microhardness, and compressive strength of a recent product of glass ionomer<br />(Glass Carbomer) compared to conventional glass ionomer.<br />Materials and Methods: Twenty primary molars were utilized for assessment of shear bond<br />strength (SBS) test. Crown surfaces of the selected teeth were fixed in acrylic blocks then, ground<br />with water-cooled silicon carbide papers to obtain a flattened dentin surfaces. The specimens<br />(n=20) were distributed into two equal groups according to the type of glass ionomer cement (GIC)<br />bonded to the dentin surface (10/ each group): group I (Fuji IX GP) and group II (Glass Carbomer).<br />To measure shear bond strength (SBS) a universal testing machine was used. For measurement<br />of water sorption (WS) and solubility (SL) 10 specimens of each material were prepared and immersed<br />in artificial saliva of pH 7 for seven days. The difference between initial and final weight<br />was estimated. Microhardness was estimated using a Vickers microhardness tester. Compressive<br />strength was evaluated using a universal testing machine.<br />Results: No significant difference in shear bond strength and microhardness between both<br />materials. The water sorption, solubility and compressive strength of CAR (Glass Carbomer Fill)<br />were significantly greater than that of Fuji IX.<br />Conclusions: Glass Carbomer demonstrated some favourable results. Among these include<br />the higher compressive strength and comparable shear bond strength and microhardness of glass<br />carbomer, compared to conventional GIC. On the other hand glass carbomer showed higher water<br />sorption and solublity than conventional GIC. Thus, glass carbomer holds a promise to be used as<br />a potential restorative material particularly in pediatric dentistry.<br /><br /><br />https://edj.journals.ekb.eg/article_79354_cba137735a489a78bbfbc589dacdcff9.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001Effect of hesperidin on antibacterial activity and adhesive properti es of an etch-and-rinse adhesive system380138127935510.21608/edj.2018.79355ENSayedGhorabLecturer, Dental Biomaterials Department, Faculty of Dentistry, Mansoura University, EgyptAshrafIbraheimLecturer, Department of Operative, Faculty of Dentistry, Mansoura University, EgyptJournal Article20200328Objectives: To evaluate the antimicrobial activity and adhesive properties of a simplified totaletch<br />adhesive system containing different proportions of Hesperidin (HPN).<br />Materials and Methods: Hesperidin was added to dental adhesive in three different ratios<br />producing four experimental adhesive groups (0 [control], 0.2, 0.5, and 1%). The antibacterial<br />activity of the prepared adhesive groups was studied using agar disc-diffusion test against<br />Streptococcus mutans. The viscosity of dental adhesives was evaluated using a cone and plate<br />viscometer. Microtensile bond strength was tested immediately and after thermocycling.<br />The fracture patterns were examined using a stereomicroscope. Data were statistically analyzed<br />using ANOVA and Tukey HSD tests (α = 0.05).<br />Results: The antimicrobial activity of HPN-incorporated experimental adhesives exhibited<br />a significant inhibitory effect against Streptococcus mutans compared with the control (P < 0.05).<br />The viscosity of the experimental adhesives increased with increasing the concentrations of HPN<br />incorporation into the adhesive. The incorporation of 0.2 wt% and 0.5 wt% HPN into the dental<br />adhesive significantly increased the immediate μTBS (P < 0.05). However, experimental adhesives<br />incorporating 1 wt% HPN showed no significant differences in the μTBS values compared with the<br />unmodified adhesive resin (P > 0.05). After thermocycling, all studied adhesive groups revealed<br />significant reduction in μTBS (p < 0.001).<br />Conclusions: 0.5 wt% HPN incorporated dental adhesives could achieve a promising<br />antibacterial effect without adversely affect the adhesive characteristics; however, thermocycling<br />significantly reduced the μTBS.<br /><br /><br />https://edj.journals.ekb.eg/article_79355_67306ad0e8af927b63c7df7750a37b82.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001Effect of different restor ative crowns on fracture resistance and stress distribution in single implants; An In-Vitro study381338227935610.21608/edj.2018.79356ENMazen A.AttiaLecturer of Fixed Prosthodontics, Faculty of Dentistry, Beni Suef UniversityHaithamAmrLecturer of Fixed Prosthodontics, Faculty of Dentistry, Fayoum UniversityJournal Article20200328Statement of the problem. Implant failure due to poor biomechanical behavior is a common<br />problem in dentistry. Occlusal overloading is considered the primary cause of peri-implantitis,<br />implant and\or prosthesis fracture, and screw loosening or fracture.<br />Purpose. The purpose of this study was to investigate the effect of different restorative crowns<br />on the fracture resistance and stress distribution in single implants.<br />Materials and Methods. One implant was anchored in a measurement model based on a<br />real-life patient situation simulating (D3) bone density. Strain gauges (SGs) were fixed mesially,<br />distally, lingual and buccally adjacent to the implant. A total of 20 crowns were produced using a<br />CAD\CAM machine and divided into two equal groups according to the material type; Zirconia<br />and (PEEK) (n=10). The magnitude of strain was recorded in microstrains (με). Each specimen was<br />loaded to fracture in a universal testing machine with a crosshead speed of 0.5 mm/min. Data were<br />analyzed with 2-way univariate ANOVA and Tukey HSD test (α=.05).<br />Results. The mean strain values for the two groups at the different (SG) sites ranged from (26.0<br />to 1033.6 μm/m). The 2-way univariate ANOVA indicated statistically significant differences (P<br /><0.001) between the zirconia and the (PEEK) crowns .In addition, Mean (SD) failure loads were<br />2070.5(100.24) N for zirconia crowns, 950.75(34.61) N for (PEEK) crowns. The 2-way univariate<br />ANOVA showed a statistically significant difference for the fracture resistance between the zirconia<br />and (PEEK) crowns (P< 0.001).<br />Conclusions: Superstructure materials appear to have an influence on strain development in<br />single implant restorations.<br /><br />https://edj.journals.ekb.eg/article_79356_3f92ce9591a5718506b01ce99b3b492d.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001Hygroscopic/Hydrolytic Kinetics of Two Bulk-fill Resin Composite Restorative Materials Stored in Different Media: An inVitro Comparative Study382338317935710.21608/edj.2018.79357ENNadia M.ZaghloulAssistant Professor, Department of Operative Dentistry, Faculty of Dentistry, Mansoura University.Journal Article20200328Objectives: The aim of this study was to determine the effect of different storage media<br />on Sorption/solubility kinetics of two bulk-fill resin composites, Venus bulk fill flowable resin<br />composite (VF) and Sonic Fill bulk fill resin composite (SF), stored in different media (alkaline<br />water Aw, 75% ethyl alcohol EA and lemon juice LJ).<br />Materials and Methods: One hundred and twenty disc specimens were fabricated and divided<br />into two main groups (n=60) involve two bulk-fill resin composites, depending on their low<br />viscosity. The specimens in each group were divided into three subgroups according to the storage<br />media (n=20) i.e. alkaline drinking water, 75% ethyl alcohol and lemon juice. All specimens were<br />desiccated before storage to obtain a constant mass (m1) and volume (V) in mm3. Specimens were<br />subjected to 4 weeks immersion, then dried and reweighed again to obtain (m2). The specimens were<br />desiccated again to obtain constant mass (m3). Sorption and solubility’s properties’ in water were<br />calculated according to proposed formula by ISO 4049- 2009.<br />Results: Two-way ANOVA indicated significant difference in sorption and solubility kinetics<br />for both factors, resin composites and immersion media (p<0.05). Tukey’s test showed that VF<br />significantly absorb fluids than SF, regardless the storage media. The mean weight changes in the<br />VF resin composite showed increasing fluid sorption after storage in AW, EA and LJ. There were<br />significant differences between either AW or EA and LJ. For SF, fluid sorption is increased from<br />AW, followed by EA and LJ. Solubility of VF was significantly higher than SF, when stored in<br />each immersion medium. The mean weight loss in the VF resin composite showed insignificant<br />increasing solubility after immersion in AW , LJ and EA. The mean weight loss for SF revealed<br />increasing solubility after immersion in AW, LJ and EA. VF revealed higher significant fluid<br />solubility when stored in water, than in EA or LJ. EA cause significantly higher solubility of SF<br />resin composite, than AW or LJ storage media,<br />Conclusions: Within the conditions of this in-vitro study, the following conclusions were<br />drawn: The sorption and solubility behaviour of the resin composites is material dependent, as Venus<br />flow bulk-fill resin composite tested in this study showed higher fluids sorption/solubility tendency<br />than that of Sonicfill bulk-fill resin composite. Regarding to the storage media, pH of the solutions<br />seems to have an influence on the sorption/solubility behavior of composite resin materials. Both<br />acidic and alkaline media increase sorption/solubility behaviour of the resin composites.<br /><br /><br />https://edj.journals.ekb.eg/article_79357_7ef4ad6838c28abcc96fe5d69b91d337.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001Shear bond strength of pressed e-max laminate veneer cemented on surface treated zirconia substrate383338437935810.21608/edj.2018.79358ENAhmed KamalEbeidLecturer of Fixed Prosthodontics, Faculty of Dentistry, MSA University, Egypt.Journal Article20200328The purpose of this study was to evaluate the shear bond strength of E-max pressed laminate<br />veneers discs cemented to the surface treated of zirconia core discs for repairing porcelain veneer<br />chipping situations. A total of 40 Zirconia discs (n=40) were divided into four groups according<br />to their surface treatment. Then 40 laminate veneer e-max press discs were constructed and<br />subsequently cemented on the different treated surfaces. All specimen surfaces were prepared with<br />a 30 μm fine diamond rotary cutting instrument with water irrigation for 10 s and dried with oilfree<br />air. Group 1: Control (n=10) where no surface treatment was applied. Group 2: The discs<br />surfaces were treated using Cimara Zircon Repair system (Voco, Germany) (n=10). Group 3:<br />The discs surfaces were conditioned with the zirconia primer Monobond plus (Ivoclar Vivadent)<br />(n=10). Group 4: The disc surfaces were conditioned using CojetTM Repair system (3M ESPE)<br />(n=10). Then each Laminate veneer was cemented in place using Rely x unicem self-adhesive<br />universal resin cement following the manufacturer recommendations. The samples were stored<br />for 24 hours in distilled water then subjected to shear bond strength test using a universal testing<br />machine to measure the adhesion strength between bonded e-max and zirconia surfaces. The<br />debonded surfaces were examined using SEMicroscope to reveal the failure nature for each group.<br />The zirconia surfaces were analyzed using EDX (energy dispersive x-ray) to reveal the dominant<br />elements left on the surface after debonding. Data were collected, tabulated and statistically<br />analyzed with ANOVA test, followed by Tukey’s post hoc pairwise comparisons (α=0.01). Zirconia<br />surfaces treated with (Cimara Zircon Repair System) exhibited superior Shear bond strength values.<br />With the limitation of this study it was found that all surface treatments used affected positively the<br />bond strength between E-max laminate veneers and Zirconia.<br /><br /><br />https://edj.journals.ekb.eg/article_79358_08a43b51c0e266b470a351774f805834.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001Surface topography and thickness of hybrid layer assessment after dentin pretreatment with egg shell powder as desensitizing agent384538537935910.21608/edj.2018.79359ENRamyAbdallahLecturer of Dental Material, Faculty of Dentistry For Boys, Alazhar University, EgyptHadeelFaroukLecturer of Operative Dentistry, Faculty of Oral and Dental Medicine, Ahram Canadian University, Egypt.Mona EEssaAssociate Professor of Operative Dentistry, Faculty of Dentistry, Beni-Suef University, EgyptJournal Article20200328Objectives: The aim is to investigate the effect of Eggshell powder solution (ESPS)<br />desensitizing agents as dentin surface pretreatments on thickness of hybrid layer of a direct resin<br />composite restoration bonded with etch and rinse adhesive systems.<br />Methods: A flat dentin occlusal surface will be prepared on extracted molar using a low speed<br />diamond saw under water coolant. Teeth will be randomly divided into three main groups according<br />to dentin surface pretreatment. First group, no dentin pretreatment (A1), second group Egg shell<br />pretreatment applied before acid etching (A2) and third group, Egg shell pretreatment applied after<br />acid etching (A3). A Teflon mold will be used to build up resin composite directly. Teeth will be<br />sectioned perpendicular to adhesive joint to obtain 0.9±0.1 mm in thickness slabs. All samples<br />will be examined under scanning electron microscope (SEM) and thickness of hybrid layer will<br />be measured. Moreover energy dispersive analytical x-ray (EDAX) analysis will be used to count<br />different minerals at tooth restoration interface.<br />Results: The SEM analysis showed that; there are established significant differences in<br />the thickness of hybrid layers among all tested groups. The EDAX analysis showed increased<br />quantitative amounts of Ca atomic % and P atomic % for the ESS treated groups.<br />Conclusion: Eggshell solution when used as desensitizing agent can significantly increase the<br />hybrid layer thickness.<br /><br /><br />https://edj.journals.ekb.eg/article_79359_67ab62a5a7b6ff3a26a380cc48b5953b.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001Comparative study between conventional and mini dental implants of different diameters supportin g mandibular overdentures. A finite element stress analysis study385538637936010.21608/edj.2018.79360ENSahar A.GhorabLecturer Prosthodontist, Faculty of Oral and Dental Medicine, Cairo University.Reham B.OsmanLecturer Prosthodontist, Faculty of Oral and Dental Medicine, Cairo University.Journal Article20200328This study was conducted to provide an understanding of the biomechanical behavior of<br />different diameters MDIs and compare it with conventional diameter implants when supporting<br />an overdenture . Three different models were designed .The first model has two standard diameter<br />implants (3.8x12mm) (D1), the second (D2) has 2 mini-dental implants (2.4x12mm) and the third<br />model (D3) has 2 of ultra-small diameter (1.8 x 12mm) all implants were placed at canines region.<br />3D finite elements stress analysis was performed to evaluate biomechanical situation in both the<br />implants and the peri-implant bone under vertical and oblique loading of the overdentures. It can be<br />concluded that the stress values affecting the peri-implant bone and the implants are reciprocal to<br />dental implant diameter and the use of MDIs as overdenture abutments should be limited to cases<br />with limited bone quantity.https://edj.journals.ekb.eg/article_79360_83034ce30de40d3347d85dcab734551a.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001Effect of Different Kinematics of Rotary NiTi Instruments on Canal Transport ation in Curved Root Canals386538727936210.21608/edj.2018.79362ENAmira GalalIsmailResearcher of Endodontics, National Research Centre, EgyptManarGalalResearcher of Endodontics, National Research Centre, EgyptJournal Article20200328Objective: This study was aimed to assess and compare between the transportation of Protaper<br />Next, WaveOne Gold and Twisted File Adaptive NiTi rotary systems on extracted curved molars.<br />Methodology: A total of ninety mesial root canals of human first and second molars were<br />randomly divided into three experimental groups; Group I: Protaper Next/Continuous rotation<br />(PTN/CR), Group II: WaveOne gold/Reciprocation (WG/R) and Group III: Twisted file Adaptive/<br />adaptive motion (TFA ). Pre- and postoperative CBCT images were taken and fusion technique was<br />applied to all specimens to ensure standardization. One-way ANOVA was used to compare between<br />more than two groups in parametric data. The significance level was set at P ≤ 0.05. Statistical<br />analysis was performed with IBM® SPSS® Statistics Version 20 for Windows.<br />Results: There was no statistically significant difference between all groups at the apical third.<br />At the middle and coronal third group 3 revealed the highest transportation followed by groups 1<br />and 2, which showed a statistically significant difference between them.https://edj.journals.ekb.eg/article_79362_87a37683d533d161ca487415600a0dcd.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001Assessment of the Quality Of Life and Patients’ Satisfaction in Egyptian Patients Wearing Facial Prostheses387338817936310.21608/edj.2018.79363ENMohamed Y.AbdelfattahLecturer of Prosthodontics, faculty of Dentistry, Tanta University, Egypt.Tareq MohamedNabilLecturer of pediatric Dentistry, Preventive Dentistry and Dental Public Health, faculty of Dentistry, Suez Canal
University, Egypt.Journal Article20200328Objectives: The aim of this study was to assess patients’ satisfaction and Quality of Life with<br />facial prostheses through a special designed questionnaire.<br />Material and Methods: 120 patients using facial prostheses retained either by chemical<br />adhesives or bone anchorage implant for at least 6 months were asked to answer a twenty questions<br />questionnaire through a cross-sectional survey. This questionnaire covered the appearance,<br />retention means and effectiveness, awareness, self-confidence, difficulty of placement and removal,<br />cleaning, restriction of social actions, pain and inflammation of tissues, and advice of the method<br />to other patients. Visual analogue scale (VA S) was used to show patient response. The mean of the<br />answers was converted into a percentage to symbolize the satisfaction index.<br />Results: Wearing facial prostheses made most of patients happy (mean (SD) 9.4 (1.54)). The<br />most satisfied patients was those who had facial prosthesis retained by implants (p = 0.025), and<br />additional self-awareness was experienced in those retained by adhesives (p = 0.012). 72% of<br />patients experienced no pain or troubles with the prosthesis during function. Both implant and<br />adhesive retained prostheses have noticeable advantages without the presence of statistically<br />considerable differences between them.<br />Conclusions: The results showed that use of extraoral prostheses retained by adhesive or by<br />bone anchorage implant provided a high level of satisfaction among patients.<br /><br /><br />https://edj.journals.ekb.eg/article_79363_738c443d822144d955aacc8cad129880.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001Comparison between Three Different Root Canal Rotary Instruments in retreatment: An in vitro study388338877936410.21608/edj.2018.79364ENShady AliHusseinLecturer of Endodontics, Ain Shams UniversityAmr AhmedBayoumiLecturer of Endodontics, Miser International UniversityJournal Article20200328Aim: The aim of this study was to compare Protaper Universal retreatment files, M-Pro, and<br />Twisted files in retreatment.<br />Methodology: Experimental groups were divided into three group; Group I: Protaper Universal<br />Retreatment (PTU; Dentsply Maillefer, Ballaigues, Switzerland), Group II: M-Pro (Innovative<br />Material and Devices, ShangHai, China), and Group III: Twisted File (TF; SybronEndo, Orange,<br />CA). Each group was evaluated for time to reach the working length, amount of debris extruded<br />during retreatment. Data were then collected, tabulated and statistically analyzed.<br />Results: Statistical analysis showed that TF recorded the least time to reach the working length,<br />while M-Pro showed the highest amount of debris extruded.<br />Conclusion: Under the condition of the current study, TF was faster than M-Pro and PTU to<br />perform gutta-percha removal in the retreatment of teeth. The use of M-Pro in retreatment increased<br />the amount of apically extruded debris.<br /><br />https://edj.journals.ekb.eg/article_79364_c562fa99e352dad90e42b6e520d969f2.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001A Cone-Beam Computed Tomography Study of Root Anatomy and Canal Morphology of Mandibular Incisors in an Egyptian Sub-Population388938947936510.21608/edj.2018.79365ENShady AliHusseinLecturer at Endodontic Department, Faculty of Dentistry, Ain-Shams UniversityTarekMostafaLecturer at Endodontic Development, Faculty of Dentistry, Ain-Shams UniversityJournal Article20200328Endodontic treatment is basically dependent on knowledge of the root canal morphology. The<br />purpose of this study was to analyze the root canal configuration of the mandibular incisor teeth in<br />the Egyptian subpopulation using cone-beam computed tomographic (CBCT) imaging. A total of<br />1140 CBCT images of mandibular incisor teeth were obtained from 300 patients who were seeking<br />to receive implant or orthodontic treatment and accepted CBCT projection. Vertucci’s classification<br />was used as a reference to correlate the analysis. The number of roots, number of canals, and root<br />canal type were calculated and plotted. The results showed that all the mandibular incisors revealed<br />one root. The analysis of root canal number irrespective to canal configuration type revealed single<br />root canal (90.2%, n= 53) out of 592 central mandibular incisors and (81.38% n= 446) out of<br />548 lateral mandibular incisors. The prevalence of two root canals in mandibular lateral incisors<br />(18.61%, n=102 out of 548) was significantly higher than that of mandibular central incisors (9.45%<br />n=56 out of 592) (P< 0.5). Within the limitations of this study, it has been concluded that CBCT<br />is efficient tool for mapping root canal configuration. The majority of the Egyptian subpopulation<br />have higher incidence of single canal in lower incisors. Most of two canal cases was type II.<br /><br />https://edj.journals.ekb.eg/article_79365_9838c74193299fdc044c749bef6b836d.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001The effect of different irrigation materials and application techniques on push-out bond strength of fiber post to root dentin389539067936610.21608/edj.2018.79366ENSherifElkhodaryLecturer of Endodontics, Faculty of Dentistry, Cairo University.RehamElbastyLecturer of Fixed Prosthodontics, Faculty of Dentistry Cairo University.Journal Article20200328Statement of the problem: Achieving a reliable bond to root canal dentin is a subject of<br />ongoing research. Improving the bond strength between root dentin and fiber posts through different<br />irrigation materials and techniques used during post space preparation has been suggested; yet,<br />there is a few data regarding the irrigation materials and application techniques that could be used<br />to achieve an optimum bond.<br />Purpose: The aim of this invitro study was to evaluate the effect of different irrigation materials<br />(NaOCl + EDTA and Qmix) and application techniques (syringe, passive ultrasonic irrigation, XP<br />finisher) on the push-out bond strength of fiber posts to root dentin.<br />Materials and methods: Forty eight human premolars, with straight root canals and average<br />root length of 17±1 mm were selected. The clinical crowns were cut 2mm above the cementoenamel<br />junction. Root canal treatment was done with ProTaper universal rotary instruments to size F4 and<br />then obturated with lateral condensation technique and AdSeal sealer. Teeth were then stored in<br />distilled water for 7 days at 37˚C after sealing of the access cavity with temporary filling free from<br />eugenol. For each tooth, post space preparation was done using gates glidden drills leaving 4-5 mm<br />of gutta percha as apical seal. FibreKleer post tapered drill corresponding to the glass fiber post<br />size was used to remove any residual root filling. The prepared roots were equally and randomly<br />divided into two main groups (n = 18) before post cementation as follows; Group I: Irrigation with<br />10 ml of 2.6% NaOCL over 60 seconds followed by 5 ml EDTA for another 60 seconds, Group II:<br />Irrigation with 3 ml Q-mix for 60 seconds. Each of the two main groups was further divided into 3<br />subgroups, Subgroup A (n = 6): Conventional syringe irrigation (IA, IIA), Subgroup B (n = 6):<br />Passive ultrasonic irrigation (PUI) was performed for 60 seconds (IB, IIB), Subgroup C (n = 6):<br />XP finisher was used with a torque-controlled motor according to the manufacturer’s instructions.<br />The canal was filled with irrigant and the finisher was operated for 60 seconds using slow and<br />gentle in-and-out movements (IC, IIC). All posts were tried-in, cleaned with alcohol, and then<br />silanized with ceramic primer for 60 seconds then air dried. Cementation was done using Rely X<br />Unicem 2 self adhesive resin cement.<br />After the luting procedure, the coronal part of the posts was covered completely with resinmodified<br />glass ionomer cement and the roots were stored in distilled water for 7 days at 37˚C.<br />Roots were embedded in epoxy resin and transversely sectioned perpendicular to the long axis of<br />the root with an Isomet machine. It was pre-set to serially obtain six specimens (2 mm ± 0.1) thick,<br />where two specimens corresponded to each root third. For push-out testing, each specimen was<br />mounted in a custom made loading fixture then subjected to compressive loading with the apical<br />surface upwards at a crosshead speed of 1 mm/min via a computer controlled testing machine.<br />The maximum failure load was recorded in Newton and converted into MPa. Two teeth as a<br />representative of each subgroup were split longitudinally after post space preparation and irrigation,<br />and smear layer was examined using scanning electron microscope at 1, 4.5, and 8mm levels from<br />the apical to the coronal third of the post space at 1000 magnification. Data were recorded, tabulated<br />and statistically analysed.<br />Results: Regarding the push-out bond strength results; it was found that regardless of application<br />techniques or radicular regions, there was no significant difference in the push-out bond strength<br />between both irrigation solutions as proven by three-way ANOVA test, where (NaOCl + EDTA ≥<br />Q mix). Irrespective to irrigation solutions or radicular regions, there was significant difference in<br />the push-out bond strength between application techniques as demonstrated by three-way ANOVA<br />test , where (PUI ≥ XP > Syringe). Pair-wise Turkey’s post-hoc showed no significant difference in<br />the push-out bond strength between (PUI and XP). Regardless of irrigation solutions or application<br />techniques; there was no significant difference in the push-out bond strength between radicular<br />regions as verified by three-way ANOVA test where (cervical ≥ apical ≥ middle). Regarding the<br />smear layer marking; it was found that there was non-significant difference between both irrigation<br />solutions as proven by Chi square test where (NaOCL+EDTA > Qmix). There was also nonsignificant<br />difference between irrigation application techniques as demonstrated by Chi square test<br />where (Syringe ≥ PUI≥ XP). In addition, there was non-significant difference between radicular<br />regions as verified by Chi square test where (apical ≥ middle ≥ cervical).<br />Conclusions Within the limitations of this study it was concluded that:<br />1. Q mix irrigation solution decreased the bond strength between root dentin and fiber posts<br />when self adhesive luting agent was used.<br />2. The use of XP finisher and passive ultrasonic irrigation as irrigant activation devices<br />improved the bond strength between root dentin and fiber posts compared to conventional<br />syringe irrigation.https://edj.journals.ekb.eg/article_79366_c9e338a93e0429e3d18d998ca075e963.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001EFFECT OF MATERIAL TYPE ON THE STRESS DISTRIBUTION IN POSTERIOR THREE-UNIT FIXED DENTAL PROSTHESIS: A THREE-DIMENSIONAL FINITE ELEMENT ANALYSIS390739187950510.21608/edj.2018.79505ENMazen A.AttiaLecturer of Fixed Prosthodontics, Beni Suef University, Egypt.Journal Article20200329<strong>Statement of the problem. </strong>Selection of the proper prosthetic restorative material is still a dilemma facing most of the clinicians.
<strong>Purpose</strong>. The aim of this study was to evaluate the effect of different framework materials on the stress distribution in a posterior three-unit fixed dental prosthesis.
<strong>Materials and methods</strong>. One 3D finite element model was specially prepared by scanning a model of a fixed dental prosthesis (FDP) in the posterior region. The model had missing maxillary first bicuspid and prepared abutments, that representing maxillary cuspid and second bicuspid. The model was simulated as restored by three different materials; Nickel-Chromium (Ni-Cr), Zirconia and Bio-HPP (PEEK). The model was subjected to compressive vertical load of 200N applied at the central fossa of the pontic. Von Mises stress values were determined.
<strong>Results. </strong>Three linear static analyses were carried out. Stress and deformation fields generated under applied load were compared. Location of both maximum Von Mises stress and maximum total deformation were found on the abutment finish line towards the pontic.
<strong>Conclusion</strong>. Special attention should be considered to the finish line contact with fixed dental prosthesis to avoid stress concentration. Tooth may be insensitive to fixed dental prosthesis materialshttps://edj.journals.ekb.eg/article_79505_709f38dc6812e855d39d800a9199396a.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001EFFECT OF MAGNETIC ATTACHMENT FLUX ON SUB-GINGIVAL PIGMENTED BACTEROIDES MELANINOGENICUS COUNT IN MAGNETICALLY RETAINED OVERDENTURE WEARERS391939267950610.21608/edj.2018.79506ENKhaled K. El-DinAminAssociate Professor, Oral and Maxillofacial Prosthodontics Department, Faculty of Dentistry, King Abdulaziz UniversitySahar MNBukharyAssociate Professor, Department of Oral Biology, Faculty of Dentistry, King Abdulaziz UniversityJournal Article20200329<strong>Statement of problem: </strong>Dental magnetic attachments has electromagnetic flux that could affect bacterial certain species growth, how would be its effect on a subgingival bacterial specie that had been isolated from both healthy and periodontally affected gingival crevice<em>. </em>
<strong>Aim of the study </strong><em>is recognition the effect of using dental magnetic attachment on subgingival Black pigmented Bacteroides. </em>
<strong>Material and Method </strong>Ten male patients were selected and received magnetically retained overdenture on mandibular canines. Subgingival samples were collected and were serially diluted. 0.1 ml was transferred from each dilution on the surface of blood agar plates which incubated anaerobically. Black pigmented colonies of bacteroides melaninogenicus were counted and the colony forming units per sample (CFU) was obtained.
<strong>Results and Conclusion </strong>significant decrease in bacteroides counts were observed after one week and a month of magnet fixation. Magnetic dental attachment flux could have an inhibitory effect on subgingival pigmented bacteroides melaninogenicus. https://edj.journals.ekb.eg/article_79506_888c5cd3bc744d1bf5db20d0c0f3598c.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001ANALYSIS FOR THE EFFECT OF IMPLANT POSITION AND DENTURE BASE MATERIALS ON STRESS DISTRIBUTION IN SINGLE IMPLANT SUPPORTED MANDIBULAR OVERDENTURE (3D FINITE ELEMENT STUDY)392739347950710.21608/edj.2018.79507ENAhmed A. ElwahedShaabanLecturer of Prosthodontics, Faculty of Oral & Dental Medicine, Future UniversityM. MohamedAmmarAssociate Professor of Prosthodontics, Faculty of dentistry, Al-Azhar University, Assiut branch.Ahmed I.MahrousAssociate Professor of Prosthodontics, Faculty of dentistry October 6th University, EgyptJournal Article20200329<strong>Purpose</strong>: The purpose of this finite element analysis study was to evaluate the effect of single implant position (central, canine) and denture base materials (conventional acrylic resin, glass fiber reinforced acrylic resin) on stress distribution in single implant supported mandibular overdenture.
<strong>Materials and methods</strong>: Two 3 dimensional finite element models of mandibular overdenture supported by a single implant were designed in solid works 2015 software; model I a single implant in central region with conventional acrylic resin denture base, model I b single implant in central region with glass fiber reinforced acrylic resin denture base, model II a single implant in canine region with conventional acrylic resin denture base, model II b single implant in canine region with glass fiber reinforced acrylic resin denture base. A 300 N vertical and A 300 N oblique unilateral loads applied at 1st premolar, 2nd premolar and 1st molar areas were applied. Maximum and minimum loads were calculated.
<strong>Results: </strong>Under vertical loading, the maximum stresses in the glass fiber reinforced acrylic denture base half that of conventional one in central position while in canine position nearly 8% increase in the stresses. Under oblique loading, the maximum stresses in the denture base show no significant difference in the 2 models.
<strong>Conclusion: </strong>These results should only be used for comparative purposes between the two denture bases and cannot be viewed as a substitute for further clinical investigation.
<strong>Conclusion: </strong>These resuIts shouId onIy be used for comparative purposes between the two denture bases and cannot be viewed as a substitute for further clinical investigationhttps://edj.journals.ekb.eg/article_79507_c8ac5384494fd4b2557cbedbdf4304bf.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001EFFECT OF TWO DIFFERENT IMPRESSION MATERIALS ON THE ACCURACY OF THE MASTER CASTS OF PARTIALLY EDENTULOUS CASES (IN-VITRO STUDY)393539417950810.21608/edj.2018.79508ENShaimaaLotfyAssociate Professor of Removable Prosthodontics, Faculty of Dentistry Ain Shams University.Yasmine G.ThabetLecturer of Removable Prosthodontics, Faculty of Dentistry Ain Shams UniversityJournal Article20200329<strong>Objectives: </strong>This study was conducted to assess and compare the effect of storage time on the dimensional stability of extended-pour alginates and polyether impression materials.<br /> <strong>Materials and Methods: </strong>This study was applied on Kennedy class II mod 1 mandibular educational model. Impressions of the model were made using Hydrogum 5 (extended pour alginate) and Impregum polyether material. Four groups were defined according to the impression material and the pouring time: Group I: Impressions were made using extended pour alginate and were poured after one day. Group II: Impressions were made using polyether impression material and were poured after one day. Group III: Impressions were made using extended pour alginate and were poured after five days. Group IV: Impressions were made using polyether impression material and were poured after five days. For each group, ten different impressions were prepared. The impressions were poured to create the casts that were digitally scanned. A 3D data analyzing software was used to evaluate the presence of discrepancies between the original cast and the experimental casts.<br /> <strong>Results: </strong>Group III showed the highest value 0.91±0.07, regarding average deviation from the defined horizontal plane in the reference cast, followed by group I 0.05±0.037, and group IV 0.25±0.019 while group II showed the lowest value 0.02±0.012. Kruskal Wallis test showed significant difference between the studied groups and Mann Whitney test with Bonferrioni correction showed statistically significant difference between Group III with group II and group IV.<br /> <strong>Conclusion: </strong>Under appropriate storage conditions, polyether impression material poured after one day produced the most dimensionally accurate casts however, extended pour alginates attained clinically acceptable range of dimensional accuracyhttps://edj.journals.ekb.eg/article_79508_7d41eac7926f20e9df46972a96c7e54c.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001CYTOTOXICITY OF THREE ROOT CANAL SEALERS ON HUMAN FIBROBLAST CELLS (WI-38) AT DIFFERENT TIMES AND CONCENTRATIONS394339487950910.21608/edj.2018.79509ENKhaled AliBeshrLecturer of Endodontics, Faculty of Dentistry, Baniswif UniversityRamy AbdallahAbdelrahimLecturer of Dental Bio-Materials, Faculty of Dentistry, Al-Azhar UniversityJournal Article20200329<strong>Introduction: </strong>The aim of the present study was to evaluate the in vitro cytotoxicity of three endodontic sealers (TotalFill BC, Gutta Flow2 and AH Plus) on WI-38 cell line human. As a reference, AH Plus was compared with the more recent endodontic sealers regarding cell viability of fibroblast cells (WI-38).
<strong>Methods: </strong>Biological testing was carried out in vitro on WI-38 cells. Cell viability assay was performed by using eluates from each endodontic sealer and dispensed to pre-cultured WI-38 cell line. The effect was assessed by MTT cell proliferation assay and ELISA reader after 24 hours and 72 hours of exposure and various concentrations of (0.5, 1, 2, 4, 8, 16, 32, 64, 125, 250 and 500mg/ ml). Statistical differences were assessed by analysis of variance and Tukey test (P < .05).
<strong>Results: </strong>TotalFill BC, Gutta Flow2 and AH Plus sealer eluates for 24 hours showed no cytotoxic effect, while it was increased by increasing the concentration for 72 hours’ measurement. Statistically there is no significant difference among the tested sealer materials; TotalFill BC, Gutta Flow2 and AH Plus.
<strong>Conclusions: </strong>In the present study TotalFill BC, Gutta Flow2 and AH Plus sealer eluates showed no cytotoxic effects at least in the first 24 hours. But they exhibited moderately or severely cytotoxic activity at 72 hours of measurement at high concentration. https://edj.journals.ekb.eg/article_79509_4a77e1ba876b0d524c4bb5c914b050ec.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001BONE HEIGHT CHANGES AROUND IMMEDIATELY LOADED IMPLANT-RETAINED MANDIBULAR OVER DENTURES WITH TWO DIFFERENT OCCLUSAL SCHEMES394939567951010.21608/edj.2018.79510ENHossam INassarAssociated Professor of Removable Prosthodontics Department, Faculty of Dentistry, Future University in Egypt.Mai AdelHelmyLecture of Removable Prosthodontics Department, Faculty of Dentistry, Cairo University.Journal Article20200329<strong>Purpose: </strong>To compare and evaluate the effect of two different occlusal schemes (lingualized and monoplane occlusion) on the bone height changes in immediate loaded implant-retained Mandibular overdenture with locator attachment
<strong>Materials and Methods: </strong>Twenty completely edentulous patients received two dental implants inserted in the Mandibular cuspids regions retaining an overdenture using locator attachment and they were divided into two equal groups. Group I were received overdenture with monoplane occlusal design, and Group II patients were received overdenture with lingualized occlusal design. Marginal bone height around implants was evaluated using Cone Beam Computed Tomography (CBCT) after 1 week, 6 months and 12 months of overdenture delivery.
<strong>Results: </strong>There was no statistically significant difference recorded between lingualized and monoplane occlusal scheme in implants retaining a Mandibular overdentures using locator attachment. https://edj.journals.ekb.eg/article_79510_24180ab7c02c7a8ab76580b70e0ffee2.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001FINITE ELEMENT ANALYSIS OF STRESS DISTRIBUTION IN WEAKENED TEETH RESTORED WITH DIFFERENT POST CORE MATERIALS395739637951110.21608/edj.2018.79511ENDoaa A.ElsharkawyLecturer of Operative Dentistry, Faculty of Dental Medicine For Girls, Alazhar University, EgyptMohamed SalahAttiaLecturer of Mechanical Engineering, Faculty of Engineering, Cairo University, EgyptJournal Article20200329<strong>Aim: </strong>This study aimed to investigate the stress patterns in weakened teeth restored with three different types of post core restorations under a vertical load using the finite element method. <strong>Methods: </strong>Four axisymmetric models were created by computer software to simulate the lower second permanent premolar in different situations. Situation 1: natural unrestored tooth, 2: weakened tooth restored with fiber reinforced composite post and core, 3: weakened tooth restored with gold alloy post and core, and 4: weakened tooth restored with zirconia post and core. The models included a post and core without a crown, gutta percha, resin cement and supporting structures. Models were considered isotropic, and exhibiting complete adhesion. A vertical static load of 40N/mm<sup>2 </sup>was applied to the occlusal surface. Von Mises tensile stresses were calculated in the model and presented in the form of a colored stress map. <strong>Results: </strong>Stress patterns in the fiber reinforced composite were closest to the stress pattern of natural tooth with most stresses found in the coronal area dissipating as they travel apically. Zirconia and gold post and cores had more stress concentration areas within the post and more apical than natural tooth or fiber reinforced composite. All post systems showed an area of stress concentration in dentin around the end of the post especially the zirconia post and core, however they were within the range of dentin tensile strength. <strong>Conclusion: </strong>zirconia posts are more likely to cause fracture in the root in weakened teeth when compared to fiber reinforced composite post and core. Fiber reinforced composite exhibits the closest biomechanical behavior to normal teeth.https://edj.journals.ekb.eg/article_79511_6ba61a4cdd50c2f4c2b162e3d378a1a6.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001SEALING ABILITY OF BIODENTINE AND SIMVASTATIN FOR REPAIR OF FURCATION PERFORATION USING DYE EXTRACTION METHOD396539717951210.21608/edj.2018.79512ENNeveen A.ShaheenLecturer of Endodontics, Faculty of Dentistry, Tanta University, Tanta, EgyptWalaa M.GhoneimLecturer of Endodontics, Faculty of Dentistry, Tanta University, Tanta, EgyptJournal Article20200329<span class="A4"><strong><span>Aim: </span></strong></span><span class="A4"><span>This study aimed to evaluate the sealing ability of Biodentine and Simvastatin for the repair of furcal perforation using dye extraction method. <strong>Materials and Methods: </strong>Thirty extracted permanent human mandibular first molars were selected. Access cavities were prepared in all first molars while perforations were made at the furcation areas of only twenty five molars. Grouping of samples was done as follows, Group 1 (n = 10) in which perforations were repaired with Biodentine™, Group 2 (n = 10) in which perforations were repaired with Simvastatin, Group 3 (n = 5) in which perforations were left unrepaired (positive control) and Group 4 (n = 5) in which no perforations were done (negative control). The sealing ability in four groups was evaluated using dye extraction method. Statistical analysis was done using One-Way ANOVA test to compare the mean values of the different groups then pairwise comparisons were performed using Tukey’s post-hoc test. <strong>Results: </strong>The highest dye absorbance was recorded for the positive control group (0.081 ± 0.013) while the lowest value was recorded for the negative control group (0.003 ± 0.002). The mean value of Biodentine group (0.025 ± 0.009) was significantly lower than Simvastatin (0.069 ± 0.011). <strong>Conclusion: </strong>Sealing ability of Biodentine is significantly better than Simvastatin in furcal perforation repair. </span></span>https://edj.journals.ekb.eg/article_79512_10338e9d6f53f03364540774c12a33f5.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001EFFECT OF THERMOCYCLING ON REPAIRED ZIRCONIA CERAMIC RESTORATIONS USING DIFFERENT BONDING AGENTS397339837951310.21608/edj.2018.79513ENShaimaa Ahmed.Abo El-FaragLecturer of Fixed Prosthodontics, Faculty of Dentistry, Mansoura University, Egypt0000-0003-4171-8054Noha Abdel MawlaEl-WasAbdelAssociate Professor of Dental Biomaterials, Faculty of Dentistry, Mansoura University, EgyptJournal Article20200329<strong>Statement of the Problem: </strong>The clinical success of zirconia intra-oral repair depends on the strength of the bond between the zirconia core and veneering composite.
<strong>Purpose: </strong>In the present study, the effect of aging on the shear bond strength of zirconia ceramic and nanohybrid composite resin as a repair material was evaluated using different bonding agents.
<strong>Materials and Method: </strong>Fifty six plates of zirconia ceramic (10mm×2mm) were prepared by CAD/CAM. All discs were air-abraded using 50μm Al2O3 particles at 2 bar pressure for 10 s, then divided into two equal groups A and B (n= 28) according to exposure to thermocycling. Each group was subdivided into four equal subgroups (n=7) according to the used bonding agent, as follows: control subgroup I, treated with Z-prime plus; subgroup II, All- Bond Universal; subgroup III, optibond; and subgroup IV, Voco-Futura bond. Surface roughness of all specimens (n=56) were evaluated immediately after bonding application using contact surf-test (Mitutoyo SJ 201, Japan). The composite resin (Ceram X nanohybrid) were then bonded and cured to each zirconia plate. The shear bond strength test was performed to group A with a universal testing machine at a crosshead speed of 1mm/ min before thermocycling. Specimens of group B were thermocycled 1000 times in water between 5˚C and 55˚C, then the shear bond strength test was performed. Bond strength values (MPa) were calculated and analyzed with a two-way ANOVA. The failure mode of each specimen was evaluated under a stereomicroscope.
<strong>Results: </strong>The mean shear bond strengths before thermocycling were 13.22, 13.03, 7.02, and 6.69 (MPa) in subgroups IA, IIA, IIIA and IVA, respectively. After exposure to thermocycling the mean shear bond strengths were 13.47, 11.48, 0.00 and 0.00 (MPa) in subgroups IB, IIB, IIIB and IVB, respectively. The results showed that the shear bond strength were significantly higher in subgroups I and II than subgroups III and IV (p< 0.05). Chemical pre-treatment of zirconia with Z- Prime Plus revealed significant higher bond strength than the Optibond (subgroup III) and Voco bond (subgroup IV) before and after aging conditions.
<strong>Conclusion: </strong>Treatment with both Z-prime and All- Bond Universal resulted in higher bond strength values compared to the Optibond and Voco Futurabond. The use of Z-Prime Plus treatment in combination with air-abrasion procedure resulted in the highest bond strength value that is stable on aginghttps://edj.journals.ekb.eg/article_79513_8f52a1206ebe3cf860f059ef8e1877a2.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001EVALUATION THE FATIGUE RESISTANCE AND COLOR STABILITY OF ACETAL RESIN AND BRE- FLEX (2nd EDITION) IN KENNEDY CLASS I REMOVABLE PARTIAL DENTURE. AN IN-VITRO STUDY398539947951410.21608/edj.2018.79514ENMaiHelmyLecture, Removable Prosthodontics Department, faculty of dentistry, Cairo UniversityJournal Article20200329<strong>Purpose: </strong>This study was aimed to compare and evaluate the fatigue resistance and the color stability of polyoxymethylene (Acetal) and Bre-Flex (2nd edition).
<strong>Materials and Method</strong>: Twenty partially edentulous models Kennedy class I were constructed with first premolars are last abutments. Models were divided into two equal groups Group A: Construction of RPD with Polyoxymethylene (Acetal) clasps and denture base, Group B: Construction of RPD with Polyamide (Bre-flex 2nd edition) clasps and denture base. The Retention and fatigue resistance of each clasp after cycling intervals (360 cycles, 720 cycles, 1440 cycles, and 2880 cycles) were measured by applying withdrawal force to it using a universal testing machine. The data of the retentive force magnitudes at different intervals were collected and tabulated. Also, the color change was evaluated after 4 weeks by measured a total 20 specimens for each group (size of the disc was set to 4 mm) in different immersion media cola (acidic pH), Licorice (alkaline pH), (neutral pH) Distilled Water using a portable Reflective spectrophotometer. The data were subjected to statistical analysis using 3-way-ANOVA test, Student’s t and paired t-tests.
<strong>Results: </strong>Regarding the retention and fatigue resistance it was found that group B recorded statistically significant higher mean value than group A. Regarding the color change the total effect of the main group on color change (ΔE); it was found that group A recorded statistically significant higher change mean value than group B as revealed by two-way ANOVA test (p<strong>=<0.0001<0.05). </strong>
<strong>Conclusion: </strong>The removable partial dentures were constructed the denture bases and the clasps with the poly amid Bre-flex 2nd edition was exhibited superior color stability and fatigue resistance when compared with the removable partial dentures constructed their claps and denture bases from polyoxymethylene (Acetal). https://edj.journals.ekb.eg/article_79514_cfd6efb53bc4b7c64c2644d76a83b161.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001COMPARATIVE STUDY OF THE CYTOTOXICTY AND GENOTOXICITY OF SILVER ZEOLITE AND NANO SILVER399540027951510.21608/edj.2018.79515ENYousra MohamedNashaatAssociate Professor of Endodontics, October 6 UniversitySoha A.HassanAssociate Professor of Cell Biology, October 6 UniversitAhmed HussienLabibAssociate Professor of Endodontics Tanata UniversityMostafa ShakerElaasarLecturer of Endodontics; October 6 UniversityAhmed MagedNegmLecturer of Endosontics; Ahram Canadian UniversityJournal Article20200329Silver ions and Nano silver particles have a great importance as they used as root canal sealers due to their antimicrobial properties. However biocompatibility and satisfactory physico-chemical properties should be achieved to directly contact the root canal sealers with the surrounding tissues. This study aimed to compare the cytotoxicity and genotoxicity of silver-zeolite with silver nanoparticles. MRC-5 cell line was used as an in vitro model. The cell viability was assessed using <em>MTT cytotoxicity assay</em>. Genotoxicity was tested by alkaline single cell gel electrophoresis (comet assay) for measuring DNA damage. Each material was tested in different concentrations (100mg/ml, 50mg/ml, 25mg/ml, 12.5mg/ml, and 6.25mg/ml). The results showed that silver zeolite has lower cytotoxic effect than silver nanoparticles among all different concentrations used in the study. Also the results showed unaccepted cytotoxicity levels for silver nanoparticles on concentrations of 100mg/ml and 50mg/ml. Data obtained from the Comet assay indicated that both silver nanoparticles and silver zeolite causes DNA damage with no significant difference between the two treated groupshttps://edj.journals.ekb.eg/article_79515_e20b4fa2a09e59dab3e0ad19f6704c74.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001MICROTENSILE BOND STRENGTH AND NANOLEACKAGE OF DENTIN SURFACES PRETREATED WITH DIFFERENT ETCHING MATERIALS400340127951610.21608/edj.2018.79516ENAhmed AdelA. AzizLecturer of Conservative Dentistry, Faculty of Dentistry, Badr University in Cairo (BUC), Cairo, EgyptHeba FathyEl ImamLecturer of Oral Histology , Faculty of Dentistry, Egyptian Russian University, Cairo, EgyptJournal Article20200329<span>This in-vitro study aimed to evaluate microtensile bond strength and nanoleackage of dentin surfaces pretreated with different etching materials. Twenty four extracted human intact second molar were selected and debrided to remove remnants of periodontal ligaments. Occlusal surfaces were flattened to expose a flat area of dentin under copious water coolant. One dentin bonding system (Te-Econom Bond) and one dental resin composite restoration (Tetric N-Ceram) were used for the study. The teeth were divided into four groups (6 each) according to the type of etchant material used as follows: group A – citric acid 6%, group B – citric acid 10%, group C – citric acid 20%, and group D- phosphoric acid 37%. The etchants were applied for 15 seconds to the dentin surface. After which teeth were washed, dried, then bonding agent was applied followed by the resin composite restoration. Then a longitudinal sectioning of restored teeth was made to obtain composite-dentin beams of (0.9 x 0.9 mm) in area. Each beam was composed of composite and dentin with adhesive at the interface. The microtensile bond strength (μTBS) was measured and the nanoleakage was observed using SEM. Data was then recorded, tabulated and statistically analyzed. There was no statistical significant difference between the results of the μTBS of groups A, B and D while group C has the lowest microtensile bond strength (19.20± 4.59). For all groups, nanoleackage was more demonstrated at group C and D, while group B show mild nanoleackage and no nanoleackage was observed for group A. It was concluded that low concentrations of citric acid was effective as etchant material compared to phosphoric acid on dentin surface in terms of microtensile bond strength and nanoleakage</span>https://edj.journals.ekb.eg/article_79516_10ebac853bbaa2c8b9a9ef6b9cda7d20.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001PREVALENCE OF TAURODONTISM IN AN EGYPTIAN POPULATION PERMANENT MOLAR TEETH401340177951710.21608/edj.2018.79517ENKhaled AliBeshrLecturer of Endodontics, Faculty of Dentistry, Beni Suef UniversityHossamMossaDepartment of Restorative Dental Science, Alfarabi Colleges, Riyadh ‑ Kingdom of Saudi Arabia.Journal Article20200329<strong>Objectives: </strong>Taurodontism is a dental anomaly used to describe vertically elongated pulp chamber with apically positioned pulpal floor and absence of the usual constriction at the cementoenamel junction (CEJ). It commonly involved permanent molar teeth especially mandibular molars.
<strong>Aim: </strong>This study was aimed to investigate the Prevalence of Taurodontism in an Egyptian Population permanent molar teeth.
<strong>Study Design</strong>: 1560 patients, from age between 18 to 40 years old were examined by panoramic radiographs for the existence of taurodontism
<strong>Results: </strong>Taurodontism was found in 9 patients with a Prevalence of 0.6% and 0.38 % of which were males and 0.12 % females. Taurodontism was significantly more common in mandible than in maxilla.
<strong>Conclusion: </strong>Taurodontism in the Egyptian population is relatively uncommon phenomenahttps://edj.journals.ekb.eg/article_79517_4c65b9172e8cc7acafec9f810af5feb5.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001RETENTION AND FATIGUE RESISTANCE OF PEEK AND ACETAL THERMOPLASTIC RESIN CLASPS401940257951810.21608/edj.2018.79518ENAzza A.El- SegaiAssistant Professor, Removable Prosthodontics Department, Faculty of Dentistry, Tanta University, Egypt.MuhammadAbbasAssistant Professor, Dental Biomaterials Department, Faculty of Dental medicine, Al-Azhar University, EgyptJournal Article20200329<strong>Aim; </strong>The objective of this study was to evaluate the retentive force of clasps made from two thermoplastic resins by the insertion/removal test simulating two years.
<strong>Methods: </strong>Over standardized premolar and molar metal crowns 36 clasps were fabricated, including 18 clasps (1.5 mm thick) from each of the following thermoplastic resins: polyetheretherketon (PEEK) and polyoxymethylene (POM). Each clasp assembly was subjected to an insertion/removal test on its abutment crown. Retention of each clasp at pre-test (Baseline) and after insertion/removal cycling intervals (360, 730, 1080, 1440, 2116 and 2880 cycles by chewing simulator) were measured by applying withdrawal force to it using universal testing machine. To analyze the retention over the course of insertion/removal test, retention was measured every 360 cycles. Data were statistically analyzed using 3-way ANOVA (α= 0.05).
<strong>Results</strong><em>. </em>PEEK Resin material group recorded statistically significant higher mean value than Acetal material group mean value (P=0.0013<0.05). Molar abutment group recorded statistically non-significant higher mean value than premolar abutment group mean value (P= 0.0620>0.05). Retention decreased significantly as indicated by three-way ANOVA (P= 0.007<0.05).
<strong>Conclusion: </strong>Retention forces of PEEK clasps were clinically acceptable, and superior to retention forces of Acetal clasps. However, both the retention of adequately designed resin clasps might be enough for clinical use. Clasps made of PEEK showed the more promising retentive force with a non-fracture tendency at tooth undercut.https://edj.journals.ekb.eg/article_79518_416149939acacf569ee4595a7ffe3831.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001IMPACT OF DENTIN CONDITIONING ON SHEAR BOND STRENGTH OF SELF-ADHESIVE RESIN CEMENT402740377951910.21608/edj.2018.79519ENShaimaa Ahmed Abo El-FaragIbraheimLecturer at Department of Fixed Prosthodontics, Faculty of Dentistry, Mansoura University, EgyptJournal Article20200329<strong>Statement of the Problem: </strong>The clinical success of fixed dental prosthesis depends on the bond strength between the prepared tooth and the luting cement.
<strong>Purpose: </strong>To estimate the bond strength of self-adhesive resin cement to dentin of prepared teeth using different conditioning methods.
<strong>Materials and Methods: </strong>Mandibular first molars (n=32) periodontally compromised and indicated for extraction were collected after patient consent from oral surgery department, Faculty of Dentistry, Mansoura University. Flat dentin surfaces were prepared and treated as follows: (1) no pretreatment of dentin (T-NT) control group; (2) self-etching bonding agent (T-SEB); (3) Dentin conditioning agent (polyacrylic acid) (T-PA) (4) Ethylenediaminetetraacetic acid (EDTA) (T-ED). Self-adhesive resin cement (SuperCem), was used to lute discs of composite on conditioned prepared teeth surfaces. Specimens were stored in distilled water at 37˚C for 24 hours after that thermal cycling was performed between 5°C and 50°C in distilled water with a dwell time of 1 minute (Theromocycler, Robota, Alexandria, Egypt) for 10.000 cycles. Shear bond strength (SBS) was measured in MPa using a universal testing machine at a crosshead speed of 0.5 mm/min. Scanning electron microscope (SEM) was used for failure modes examination.
<strong>Results: </strong>SPSS (22) was used for statistical analysis. One-way ANOVA and Tukey tests were used for comparing data at (p=0.001). The highest mean SBS (MPa) was reported for group T-SEB (3.9 MPa), while the lowest mean SBS value was observed for group T-NT (2 MPa). There was no statistically significant difference between group T-SEB (3.9 MPa) and group T-PA (3.3 MPa). Also there was no statistically significant difference between the other two test groups (T-NT=2 MPa, T-ED=2.6 MPa) (P>0.05). On the other hand there was statistically significant difference between group T-NT (2 MPa) and groups T-SE and T-PA groups (P<0.05).
<strong>Conclusion: </strong>Conditioning of prepared dentin using self-etching adhesive or polyacrylic acid significantly increased the bond strength of self-adhesive resin cement.https://edj.journals.ekb.eg/article_79519_b05158d91b6412624026426639ea9bf7.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001CLINICAL EVALUATION OF ROOT CANAL OBTURATION QUALITY USING TWO DIFFERENT SEALERS AND OBTURATION TECHNIQUES BY CONE BEAM COMPUTERIZED TOMOGRAPHY (IN-VIVO STUDY)403940487952110.21608/edj.2018.79521ENSamia MEl-ShereifAssociate Professor of Endodontics, Faculty of Oral and Dental Medicine, Cairo University.Mohamed IbrahimRabieLecturer of Endodontics, College of Dentistry, Suez Canal UniversityJournal Article20200329<strong>Introduction: </strong>new materials and techniques were developed to achieve adequate root canal obturation by complete filling of the canal space with a stable, biocompatible material that prevents the ingress of bacteria and/or its by-products to periapical tissue.
<strong>The purpose </strong>of this study was to evaluate quality of two different root canal sealer and filling techniques using cone beam computerized tomography (CBCT)
<strong>Materials and methods: </strong>Seventy-two root canals were prepared using protaper next rotary system. Root canals were divided into two equal groups 36 teeth each. Group I: teeth were obturated using single cone technique with MTA fill apex sealer. Group II: teeth were obturated using continuous wave technique with resin-based sealer (AH plus). The voids within filling materials as well as along dentin walls were examined using CBCT.
<strong>Result: </strong>results revealed that the difference between different thirds was extremely statistically significant in single cone technique, while in continuous wave technique there was no significant difference between thirds. There was no significant difference between both techniques in apical and middle third, while in cervical third there was a significant difference, as single cone showed more voids. Both techniques showed accepted working length of the obturation.
<strong>Conclusions: </strong>CBCT is an accurate tool for assessment of root canal filling quality. There were more voids present in coronal third in both techniques. Continuous wave technique showed fewer voids in cervical third compared to single cone technique. The present study showed that none of the root canal obturated teeth were gap-free. https://edj.journals.ekb.eg/article_79521_c8d940816dfe38664229e90ac04cb27e.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001COMPARATIVE EVALUATION OF MICROLEAKAGE AND SHEAR BOND STRENGTH OF BIOACTIVE DENTIN SUBSTITUTE AND NANOHYBRID COMPOSITE RESIN404940567952210.21608/edj.2018.79522ENOlaBarakatAssociate Professor, Department of Operative Dentistry, Faculty of Oral and Dental Surgery, Misr University For Science and Technology. EgyptMuhammad ASammanAssociate Professor Dental Biomaterials Department , Faculty of Dental Medicine, Al Azher University, Cairo, Egypt.Journal Article20200329<span class="A4"><strong><span>Background: </span></strong></span><span class="A4"><span>In clinical practice, the restoration of non-carious cervical lesions is a challenge, because most of the time the cervical margin is located in cementum or dentin. This characteristic makes the cervical margin more susceptible to microleakage, causing marginal stains, postoperative sensitivity and recurrent caries. </span></span>
<span class="A4"><strong><span>Aim</span></strong></span><span class="A4"><span>: To compare the microleakage and bond strength for teeth restored with Activa Bioactive restorative and nanohybrid composite resin </span></span>
<span class="A4"><strong><span>Materials and methods: </span></strong></span><span class="A4"><span>Twenty permanent premolars were selected with class V cavities for microleakage, and 20 permanent premolars were selected for shear bond strength. Microleakage was checked using dye penetration method under digital microscope Universal testing device was used to assess the shear bond strength. Leakage scores, mean and standard deviation values for shear bond strength were calculated from the recorded values. For numerical data student t-test was performed to detect the significance between both groups. For categorical data analysis Chi square test was done. </span></span>
<span class="A4"><strong><span>Results; </span></strong></span><span class="A4"><span>There was non-significant difference between ACTIVA bioactive restorative group and nanohybrid composite resin group in both parameters; leakage and bond strength </span></span>
<span class="A4"><strong><span>Conclusion: </span></strong></span><span class="A4"><span>Based on the results of the present study, the type of restorative material did not appear to have a significant influence on microleakage or bond strength </span></span>https://edj.journals.ekb.eg/article_79522_d60c6b4a0cabdfef451947196327b96a.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948464Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)20181001ADJUNCTIVE USE OF HYALURONIC ACID WITH SCALING & ROOT PLANING IN TREATMENT OF CHRONIC PERIODONTITIS PATIENTS WITH DIABETES MELLITUS TYPE 2: A RANDOMIZED CONTROLLED TRIAL405740659176510.21608/edj.2018.91765ENGihane GharibMadkourAssociate Professor, Oral Medicine and Periodontology Department, Faculty of Dentistry, Cairo University - EgyptIbrahimEL RefaieLecturer, Oral Medicine & Periodontology Department, Faculty of Dentistry, Cairo University - EgyptBasmaMostafaAssociate Professor, Surgery and Oral Medicine Dep., Oral and Dental Research Division, National Research Centre, Cairo - EgyptJournal Article20200524<strong>Objective</strong>: The present study aimed to assess the adjunctive use of Hyaluronic acid with scaling & root planing (SRP) in patients with chronic periodontitis & diabetes mellitus type 2.
<strong>Subjects &Methods</strong>: Thirty subjects with chronic periodontitis & diabetes mellitus type 2 were included in this randomized clinical trial. These subjects were randomly allocated into test & control equal groups. The test group comprised fifteen patients who received SRP with subgingival application of Hyaluronic acid as an adjunct. The control group included fifteen patients who received SRP alone. Plaque index (PI), gingival index (GI), probing depth (PD) & clinical attachment level (CAL) were measured & documented at baseline, 6 weeks & 12 weeks intervals.
<strong>Results</strong>: A statistically significant clinical improvement in all clinical parameters was shown in the test & control groups after SRP, 6 weeks & 12 weeks follow up intervals (p≤0.05). Statistically significant better results were observed in the test group, compared to control group, in all periodontal parameters, except PI, at 6 weeks and 12 weeks (P≤0.05).
<strong>Conclusion</strong>: Adjunctive use of Hyaluronic acid with SRP in the treatment of chronic periodontitis patients with diabetes mellitus type 2 offers superior clinical results compared to SRP alone.https://edj.journals.ekb.eg/article_91765_39a4d40bf1bc5852fdfdf663d8088763.pdf