ORIGINAL_ARTICLE
Assessment of two different Splinting materials on the immediate functional loading of Implants placed in mandibular unilateral free end saddle cases
Background: The class II Kennedy mandibular removable partial denture has many problemsas the different nature of support as well as crossing the arch for stabilization. The Target of thiswork was to evaluate the changes that occurs in the supporting structures of the implantsplaced in class II Kennedy cases as a result of two different types of splinting materials.Materials and Methods: Thirty implants were placed in ten patients with unmodifiedmandibular Kennedy Class II. For each patient, three implants were placed at the premolar/molarmandibular region. All the implants were immediately loaded following an Immediate FunctionalLoading Protocol. Patients were divided into two equal groups; Group A: received superstructuresthat were splinted with acrylic resin while Group B; received superstructures that were splintedwith metal. Radiographic evaluation using dental CT was carried out at intervals of 0, 6, 12 and24 months after implant surgery.Results: The results comprised the assessment of the bone height changes surrounding thethree implants placed unilaterally in the posterior mandibular areas of ten patients as a result of twodifferent splinting materials; the acrylic resin and the chrome cobalt metal alloy. Statistical analysisshowed that there was a statistically significant difference in the mean bone height values along thewhole study period between both groups (P ≤ 0.05) where there was more favorable bone heightvalues and hard tissue reaction in Group B (metal splinting) than Group A (Acrylic splinting).Conclusion: Within the limitation of this study, it can be concluded that the rigid splintingand immobilization of immediately loaded implants by metallic superstructures reduced thetransmission of micro-motion to the implant bodies and improved peri-implant bone reaction incomparison with the use of the less rigid acrylic resin material.
https://edj.journals.ekb.eg/article_79175_8516c8fc4eca05b1d6c9267f79d25dde.pdf
2018-10-01
3535
3542
10.21608/edj.2018.79175
Class II Kennedy
rigid splinting
immediate loading
functional loading
Heba
Khorshid
1
Lecturer, Department of Prosthodontics, Faculty of Oral and Dental Medicine, Cairo University.
AUTHOR
Nora
Sheta
2
Assistant Professor, Department of Prosthodontics, Faculty of Oral and Dental Medicine, Cairo University
AUTHOR
ORIGINAL_ARTICLE
EFFECT OF ATTACHMENT RESILEINCY ON MUSCLE ACTIVITY IN IMPLANT RETAINED MANDIBULAR OVERDENTURE
Objectives: This study aimed to investigate masticatory muscle activity in patients treated with2 modalities of implant mandibular overdenture prosthesis.Methodology: Fourteen completely edentulous male patients were selected and four implantswere inserted for each patient. After 3 months of installation, the patients were equally divided intotwo groups; group I receiving overdentures retained with ball attachments and group II receivingtelescopic retained overdentures. Muscle activity was measured at time of denture insertion, twoweeks and one month after insertion.Results: The results revealed that muscle activity was significantly lower in telescopic retainedoverdentures compared to overdentures retained with ball attachments.Conclusion: Telescopic attachments decreased the effort exerted by the muscles compared toball and socket attachments.
https://edj.journals.ekb.eg/article_79176_0aaaaee5580e771d2beb75fc1ef7fc05.pdf
2018-10-01
3543
3550
10.21608/edj.2018.79176
muscular activity
Implants
overdenture
telescopic attachments
Nada
El Khourzaty
1
Lecturer, Removable Prosthodontics, Faculty of Dentistry, Cairo University, Cairo, Egypt
AUTHOR
Nancy
Elsherbini
2
Lecturer, Removable Prosthodontics, Faculty of Dentistry, Cairo University, Cairo, Egypt
AUTHOR
Aliaa
Tawfik
3
Lecturer, Clinical Neurophysiology Unit, Faculty of Medicine, Cairo University, Cairo, Egypt
AUTHOR
ORIGINAL_ARTICLE
Assessment of the Technical Quality of Root Canal Treatment in Pre-clinical Endodontic Training Comparing Artificial Teeth to Extracted Natural Human Teeth
Introduction: Extracted natural human teeth were used exclusively for preclinical endodontictraining. However, an alternative method involves the use of artificial teeth aiming to overcomethe limitations in natural teeth. This study aimed to radiographically evaluate the technical qualityof preclinical single root canal treatments performed by undergraduate dental students using twoalternative models; artificial teeth and extracted natural human teeth.Materials and methods: Cross-sectional study, 228 single rooted teeth in academic years2017- 2018 were obtained from the preclinical practice of undergraduate program in endodonticsat the school of dentistry, King Abdulaziz University, Jeddah, Saudi Arabia. Four observers wereasked to independently evaluate the radiographic quality of the root canal fillings according to threeparameters: Filling length, density (homogeneity), and taper of the filling in the root canals.Results: There were no significant correlation between the type of teeth and all three parameters;length, density, and taper of the root canals fillings. In addition, there was no statistically significantdifference between adequacy of the root canals fillings and the type of teeth (P. value: 0.455).Extracted natural human teeth showed overall 10% adequate filling, 77.7% moderately filling,and12% poorly filling. Meanwhile, artificial plastic teeth showed overall 13% adequate filling,81.6% moderately filling, and 5% poorly filling.Conclusion: Artificial teeth might be suitable for preclinical endodontic training but cannottotally substitute the requirement to learn with extracted natural human teeth as part of preclinicalendodontic training. They could be incorporated with natural teeth.
https://edj.journals.ekb.eg/article_79177_987732c6146cf777cb55268319d125bc.pdf
2018-10-01
3551
3558
10.21608/edj.2018.79177
Preclinical endodontic training
radiographic assessment
quality of root canal filling
extracted natural human teeth
artificial plastic teeth
Ruaa
Alamoudi
1
Assistant Professor of Endodontics, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia
AUTHOR
Omar
Fahim
2
Professor of Endodontic, Cairo Egypt, Faculty of Oral & Dental Medicine, Cairo University
AUTHOR
ORIGINAL_ARTICLE
Bond strength of hard and soft relining materials to thermoplastic monomer free microcrystalline polymer ( In-vitro comparative study)
Purpose analysis of bond strength of various denture relining materials to recently introducedthermoplastic monomer free semi rigid microcrystalline polymer and heat cured denture basematerials.Materials and methods: designed with cylindrical –shaped silicon patterns with dimensions20 mm in length and 8mm in diameter. Samples branched into four groups(20 samples for eachgroup):GI: heat cured acrylic resin samples with hard relining material, GII: heat cured acrylic resinsamples with soft relining material. GIII: thermoplastic monomer free semi-rigid microcrystallinepolymer (karadent) samples with hard relining material, GIV: thermoplastic monomer free semirigidmicrocrystalline polymer samples with soft relining material .Tensile and shear bond strength of hard & soft reliner to the two denture base materialsexamined by Instron Universal Testing Machine . Multiple group comparisons was assisted byone-way ANOVA test followed by T- test for pair wise comparisons to estimate any significantdifferences between groups. The tests deemed significant when p ≤ 0.05 and highly significantwhen p ≤ 0.001.Results: Highly significant differences for both tensile and shear bond strength mean valueswas found between groups regarding the mean applied loads, P-value ≤ 0.001. The t- test forcomparison showed a extremely significant variance in the mean tensile & shear bond strengthbetween groups. Hard relining material showed greater mean values of both shear and tensile bondstrength regarding the heat cured denture base material (GI) followed by karadent one (GIII) . Thelowest mean values was found in soft relining material, specially that with karadent denture basematerial ( GIV) for both shear and tensile bond strength.Conclusion: supporting on the results of this research, it might be terminated that newlyintroduced thermoplastic monomer free semi rigid microcrystalline polymer successfully acceptrelining specially with hard relining material .It overcomes the main problems of thermoplasticresins that can’t accept relining
https://edj.journals.ekb.eg/article_79178_69c066e6aebfd920c354e8673b9249f4.pdf
2018-10-01
3559
3566
10.21608/edj.2018.79178
Hala
Abd El Hameed
1
Asist Prof. of Prosthodontics, Faculty of Dentistry Suez Canal University
AUTHOR
Eman
Mohamed
2
Lecturer of Prosthodontics, Faculty of Dentistry Suez Canal University
AUTHOR
ORIGINAL_ARTICLE
Evaluation of Debris Extrusion and Smear Layer Production Following Preparation Using Three Different Nickel Titanium Files
Objectives: The aim of this study was to compare the amount of apically extruded debris andthe patterns of smear layer formation following the preparation of root canals in extracted humanteeth using ProTaper Next, Twisted file, and a reciprocating single-file system.Material and Methods: Forty-five freshly extracted human single-rooted maxillary incisorswere divided into 3 groups (n=15) then instrumented using Protaper Next, Twisted files, andReciproc. The extruded debris were collected in a pre-weighed Eppendorf tubes. The tubes werestored in an incubator at 70 °C for 2 days before weighing the dry debris using analytical balance.The debris weight was determined by subtracting the initial weight from the final weight. Rootsamples were splitted longitudinally into two halves by making grooves then root halves (cervical,middle and apical) thirds were examined using Environmental Scanning Electron MicroscopeESEM (FEI Quanta 250 FEG, Berlin, Germany) at ×1500 magnification. All the data were subjectedto statistical analysis using Chi-squared, Fisher`s Extract.Results: The three tested rotary nickel titanium files produced comparable amount of debrisextrusion and smear layer patterns covering the root canal dentin walls. Apical third showed theheaviest accumulation of smear layer.
https://edj.journals.ekb.eg/article_79179_a6b2843021e3ecac276a99908ca0a9da.pdf
2018-10-01
3567
3574
10.21608/edj.2018.79179
Debris extrusion
Protaper Next
Twisted file
Reciproc
Smear layer
Reem
Abdelgawad
1
Assistant Professor of Endodontics, College of Dentistry, Taibah University, Medina, Saudi Arabia, Lecturer of Endodontics, Faculty of Dentistry, Suez Canal University, Ismailia,Egypt
AUTHOR
Bassem
Eid
2
Assistant Professor of Endodontics, Al-Farabi College of Dentisrty and Nursing, Jeddah, Saudi Arabia, Lecturer of Endodontics, Faculty of Dentistry, Al-Ahram Canadian University, Giza, Egypt
AUTHOR
ORIGINAL_ARTICLE
Color Modifying Effect of Resin Infiltrant (icon) Versus Adhesive Resin on Aesthetic Correction of Enamel White Spot Lesion: RCT
Objectives: Resin infiltration is an innovative approach for enhancing the esthetic appearanceof white spot lesions (WSLs). The aim of this study was to compare the effect of both resin infiltrant(ICON) and adhesive resin with respect to esthetic improvement.Methods: A randomized controlled split- mouth clinical trial was conducted on 10 youngadults with at least two non-cavitated white spot lesions in esthetic zones. They were randomlyassigned to two treatment groups: resin infiltrant (Icon, pre-product: DMG) or AdperTM singlebond 2 adhesive system (3M ESPG dental product, USA) application after 15% hydrochloric acid(HCL) etching and dehydration with ethanol. Vita Easyshade V (Vita Zahnfabrik, Bad Sackingen,Germany) spectrophotometer was used to measure the CIELAB coordinates and values were usedto calculate difference in color (ΔE). Data were tabulated and statistically analyzed using computersoftware SPSS.Results: There was a statistically significant decrease in both (ΔL) and (Δa) with increase in(Δb) with ICON application (p<0.05). Regarding adhesive resin, there was a significant decrease inboth (ΔL) and (Δa) coordinates with non-significant change in (Δb). Also, there was a statisticallysignificant difference between ICON and adhesive resin regarding (ΔE).Conclusions: Color change of white spot lesion treated with ICON and adhesive resin wasclinically obvious after treatment with hydrochloric acid. However, ICON reported significantresults in esthetic improvement in all color parameters.
https://edj.journals.ekb.eg/article_79180_12ef8c0400d970010a984e74e74c12bb.pdf
2018-10-01
3575
3581
10.21608/edj.2018.79180
White spot lesions
Resin infiltration
Resin infiltrant
Adhesive resin
Esthetic
Rania
Mosallam
1
Associate Professor of Conservative Dentistry Department, Faculty of Oral and Dental Medicine, Cairo University
AUTHOR
Hossam
El Mandouh
2
Associate Professor, Conservative Dentistry Department, Faculty of Dentistry, Suez Canal University
AUTHOR
Osama
Mosallam
3
Researcher in Restorative Dentistry and Dental Material Research Department, National Research Centre, Giza, Egypt
AUTHOR
ORIGINAL_ARTICLE
EFFECT OF SILANIZED ZIRCONIA ON SOME MECHANICAL PROPERTIE S OF HEAT -POLYMERIZED POLY METHYLMETHACRYLATE DENTURE BASE MATERIAL
Objective: The purpose of this work was to study the effect of addition of silanized zirconiapowder on flexural strength, deflection, modulus, toughness and micro-hardness of heat-polymerizedpoly methyl methacrylate (PMMA) denture base resin.Materials and Methods: One hundred specimens of heat-polymerized PMMA were preparedfor flexural and hardness tests, fifty for each. Zirconia (ZrO2) powder was treated with silanecoupling agent then added to acrylic powder in percentage of 0%(control), 0.5%, 1%, 2% and 5%by weight. Specimens for flexural test were prepared in the shape of flat strips with dimensions of(65×10×2.5mm) using compression molding technique. Flexural test was performed by three-pointbending test using universal testing machine. Flexural strength, flexural deflection, flexural modulusand toughness were obtained from the software of the testing machine. Specimens for microhardnesstest were prepared in dimensions of (10×10×3mm). Micro-hardness was determinedusing Vickers Micro-hardness Tester. Digital microscope was used to capture photomicrographsat x500 magnification of the surface of randomly selected specimen for each group to show thedistribution of different percentages of zirconia. One-way Anova followed by Scheffe’s post hocmultiple comparison test was performed with 5% level of significance for testing the significancebetween the means of tested groups.Results: There is a significant difference among the mean values of flexural deflection, flexuralmodulus, toughness and micro-hardness (P<0.05%). The mean values of flexural strength were notsignificantly different (P>0.05%). The digital microscope has shown nearly even distribution ofzirconia particles within the acrylic matrix at 0.5% and 1%, while clusters started to form at 2%,and 5% zirconia.Conclusion: Silanized zirconia powder could be used to improve the properties of heatpolymerizedacrylic denture base resin. The most appropriate percentages were 1% and 2%.
https://edj.journals.ekb.eg/article_79181_44a7fdea48ad84437856c75f433612f2.pdf
2018-10-01
3583
3592
10.21608/edj.2018.79181
Zirconia powder
Silane coupling agent
Modified denture acrylic resin
Flexural test
Micro-hardness
Hend
Elkafrawy
1
Lecturer of Dental Biomaterials, Faculty of Dentistry, Tanta University, Egypt
AUTHOR
Nancy
Farghal
nancyfarghal@gmail.com
2
Lecturer of Dental Biomaterials, Faculty of Dentistry, Tanta University, Egypt
AUTHOR
ORIGINAL_ARTICLE
Surface Roughness, Hardness, Color Stability, Water Sorption and Water Solubility of PMMA Denture BaseMaterial Reinforced with SynthesizedInorganic, Organic, and Hybrid Nanofibers
Objective: The objective of the study was to assess surface roughness, microhardness, colorstability, water sorption and water solubility of polymethyl methacrylate (PMMA) denture base resinreinforced with inorganic {silanized ZrO2}, organic {Bisphenol A diglycidyl ether dimethacrylate(Bis-GMA)+Triethylene glycol dimethacrylate (TEGDMA)+Polyethylene glycol dimethacrylate(PEGDMA)} and hybrid {silanized ZrO2+Bis-GMA+ TEGDMA} Nanofibers.Materials and Methods: The study was divided into four groups according to the addednanofibers (6wt%) to heat curing PMMA denture base material; Control group: PMMA denturebasematerial without reinforcing nanofibers, Inorganic group: PMMA denture-base material withsilanized ZrO2 nanofibers, Organic nanofibers group: PMMA denture-base material with Bis-GMA/TEGDMA/PEGDMA nanofibers and, Hybrid nanofibers group: PMMA denture-base material withsilanized ZrO2/Bis-GMA/TEGDMA nanofibers. For each group, 10 specimens were prepared andtested for surface roughness, microhardness, water sorption and water solubility. For each group11 specimens were prepared and tested for color stability. Surface roughness was measured byoptical method. Digital Microhardness tester was used to measure Vickers microhardness. Colorstability was evaluated according to ISO/FDIS 20795-1 and ISO 7491, using a Portable ReflectiveSpectrophotometer. Water sorption (WSP) and water solubility (WSL) were performed accordingto ISO/FDIS 20795-1. One-way ANOVA was used for comparison between groups and Post-Hoctest (Tukey’s tests) was used for multiple comparisons. P-value different.Results: One-way ANOVA revealed insignificant differences between the studied groups insurface 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) revealedthat: 1) microhardness means of nanofibers-reinforced groups were markedly significantly higherthan control group (p=0.000). 2) WSP of organic nanofibers reinforced group was significantlylower than that of control (p=0.008), hybrid (p=0.001) and inorganic (p=0.000) groups that werenot significantly different from each other (p≥0.243). 3) WSL of ZrO2 nanofibers reinforced groupwas significantly higher than control, organic, and hybrid groups (p=0.000). However, the controlgroup was not significantly different from organic (p=0.992) and hybrid (P=0.018) groups. Organicgroup was significantly lower than hybrid group(p=0.009).Conclusions: Addition of 6% nanofibers prepared by electrospinning technique to PMMAdenture resin significantly enhanced microhardness. Surface roughness and color stability were notaffected. Water sorption was significantly reduced with organic nanofibers, but was not affected withZrO2 and hybrid nanofibers. The highest water solubility for nanofibers reinforced groups recordedin 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.pdf
2018-10-01
3593
3608
10.21608/edj.2018.79224
Inorganic
organic
Hybrid Nanofibers
PMMA Denture Base
Microhardness
Surface roughness
color stability
Water Sorption and Solubility
Usama
Abdel-Karim
1
Assistant Professor, Department of Dental Biomaterials, Director of Research Lab, Faculty of Dentistry, Tanta University, Tanta, Egypt.
AUTHOR
Samy
El-Safty
2
Lecturer, Department of Dental Biomaterials, Faculty of Dentistry, Tanta University, Egypt
AUTHOR
El-Refaie
Kenawy
3
Professor, Department of Chemistry, Director of Technology Transfer office, Faculty of Science, Tanta University, Tanta, Egypt.
AUTHOR
ORIGINAL_ARTICLE
Randomized controlled clinical trial of implant overdenture retained with zirconia bars or telescopic crowns: a 1-year follow-up
Implant retained overdenture is a popular treatment for edentulous patients whether splinted orsolitary attachments were used. The aim of the study was to examine the difference between barand telescopic overdenture attachment fabricated from zirconia. Ten male patients were selectedto receive implant overdenture retained by two implants at para-sympheseal zone. These patientswere categorized into two groups based on the type of attachment used. Group (A) was the barconnectedgroup while group (B) was the telescopic attachment group. Both bone height and bonedensity were monitored, using cone beam computerized tomography, throughout the follow upperiods (at loading time, three, six and twelve months). The results showed the mean values ofperi-implant bone height loss of group A were less than group B with statistically significant values(P< 0.05). The mean values of the bone density showed higher bone density values in group A thangroup B with statistically significant value at (P < 0.05). It could be concluded that the zirconiabar-attachment overdenture showed better treatment outcomes than zirconia telescopic attachment.Accordingly, the bar-clip attachment system showed some preference in preserving peri-implantbone surround the implants.
https://edj.journals.ekb.eg/article_79225_a2a98ff4291b0d257ef8eb82c6bd255d.pdf
2018-10-01
3609
3621
10.21608/edj.2018.79225
Mahmoud
Salloum
1
Assistant Professor Prosthetic Dental Science Dept., College of Dentistry, Jouf University, KSA.
AUTHOR
Moustafa
Hussien
2
Associate Professor of Prosthodontics, Faculty of Dentistry Qassim University , K.S.A
AUTHOR
ORIGINAL_ARTICLE
A clinical evaluation of retention of maxillary complete CAD/CAM and conventional dentures
Background: Computer-aided design (CAD)/computer-aided manufacturing (CAM) denturesare suppose to have more favorable material properties than conventional heat - cured acrylicdentures, among them a lesser methacrylate monomer release.The purpose of this clinical study: Was to evaluate the retention quality of conventional heatcureacrylic denture bases and digitally milled maxillary complete denture bases.Material and methods: This study was done on six edentulous patients; CAD/CAM dentureswere constructed from six different master casts by using CAD/ CAM system. Conventional heatcureacrylic dentures acted as a control group. Universal testing machine was used to measure theretention of the denture. Every denture base was subjected to a slowly increasing vertical load untilthe denture was totally out of place 5 times at 10-minute intervals. The average retention of the twoassemble methods was analyzed using Independent t-test & Paired t-test.Results: CAD/CAM denture showed statistically significant higher mean retention value thanconventional denture at insertion and after one-month (P value<0.000, <0.000) respectively.Conclusion : Compared with the traditional manual method, the retention of the maxillarycomplete denture prepared using the CAD/CAM method for the edentulous alveolar ridge wassignificantly higher, meaning that the CAD/CAM method can meet the clinically acceptableprecision for design and development of complete dentures as trial for restoring edentulous jaws.
https://edj.journals.ekb.eg/article_79226_0a07c0f8ac29d78240a57ad960f147c0.pdf
2018-10-01
3623
3630
10.21608/edj.2018.79226
CAD-CAM
conventional
complete denture
Shereen
Kabeel
1
Lecturer of Removable Prosthodontics, Faculty of Dental Medicine for Girls, Al-Azhar University
AUTHOR
Dina
Kholief
2
Assistant Professor of Removable Prosthodontics, Faculty of Dental Medicine for Girls, Al-Azhar University.
AUTHOR
ORIGINAL_ARTICLE
Comparative study between bone height changes around implants placed using stereolithographic versus conventional surgical guides
Background: Accuracy of implant placement using computer designed surgical guides ascompared to conventional laboratory-processed guides has been investigated by many researchers.However there are no published articles on the effect of placing dental implants using computerdesignedguides on bone height changes around the implants as compared to those placed usingconventional guides.Purpose: The aim of this study was to compare between bone height changes around dentalimplants placed using stereolithographic surgical guides versus conventional guides in completelyedentulous patients rehabilitated with 2-implant supported mandibular overdentures opposed byconventional maxillary complete dentures.Methods: This parallel randomized controlled trial (RCT) included 14 participants (age rangingfrom 50-60) with a mean age of 56.7 years who were selected based on specific inclusion criteria.Conventional maxillary and mandibular compete dentures were constructed for all participants whowere then randomly divided into two equal groups (7 participants in each). All participants receivedtwo implants, 3.5 mm in width and 10 mm in length, in the mandibular inter-foraminal areas(canine region). However implants in Group I (Control) were placed using a conventional surgicalguide while implants in Group II (Experimental Group) were placed using a stereolithographicsurgical guide. After implants’ osseointegration, all participants received ball attachment- retainedmandibular overdentures. Bone height changes around the installed implants were evaluated withthe aid of cone beam computed tomography (CBCT) scans. Measurements were recorded threetimes at 0 months, 6 months and 12 months after overdenture insertion and the changes werecalculated and statistically analysed. Statistical significance was set at 5 %.Results: All participants attended all follow up visits with no drop outs. None of the implantswas lost presenting a 100% survival rate for both groups. After 6 months post-insertion, the meanbone loss was 0.32mm and 0.31mm for groups I and II respectively. After 12 months post- insertion,mean bone loss reached 0.61mm and 0.49mm for groups I and II respectively. There were nostatistically significant differences between the two groups at both (6 and 12 months) follow-upperiods.Conclusion: Bone height changes around implants placed with stereolithographic surgicalguides versus conventional guides were statistically insignificant with no relevant superiority ofone guide over the other. Both surgical guides provided clinically successful implant treatment witha 100% survival rate for both groups during the one-year follow-up period.
https://edj.journals.ekb.eg/article_79227_7859d4971036c8e45c5eec34a4d808ce.pdf
2018-10-01
3631
3640
10.21608/edj.2018.79227
Azza
Metwally
1
Associate Professor, Removable Prosthodontic Department, Faculty of Dentistry, Cairo University, Egypt.
AUTHOR
Amal
Swelem
amalswelem@gmail.com
2
Associate Professor, Removable Prosthodontic Department, Faculty of Dentistry, Cairo University, Egypt.
AUTHOR
ORIGINAL_ARTICLE
Immediate versus Delayed Implant placement in Diabetic Patients rehabilitated with Mandibular Overdentures – A Split mouth study
Purpose: This comparative controlled trial (CCT) evaluates the survival rate of implants placedinto fresh extraction sockets and compare it with implants placed in healed sites in type 2 diabetic,completely edentulous subjects rehabilitated with mandibular implant overdentures (MIODs) followinga delayed loading protocol and opposed with conventional complete dentures.Materials and Methods: Fourteen implants were placed in seven well-controlled diabeticsubjects as determined by Glycosylated hemoglobin (HbA1c) values before implant placement(baseline) and throughout the follow-up period. Each patient received two implants; one implant inhealed canine site and the other was immediately inserted following the extraction of an existingperiodontally hopeless canine. The implants were uncovered approximately 3 months after placementand restored with bar-retained overdenture. The patients were scheduled for regular follow-upappointments and for data collection. Kaplan-Meier analysis was used to calculate implant survivalfrom time of prosthesis placement through 24-month follow-up period.Results: No implant failed in the delayed placement group within the 2 years study period,whereas in the immediate group two implants failed in two patients following the prosthetic loadingat one-year follow-up period resulting in 71.2% implant survival rate. HbA1c levels ranging from7.4 to 8.0 percent were identified in two patients with implant failures. There was no statisticallysignificant difference in survival rate between immediate and delayed implants in type 2 Diabeticsubjects rehabilitated with MIOD s (P=0.141).Conclusions: Within the limitations of this study, insufficient evidence exists to recommendimmediate implant placement in type 2 diabetic subjects rehabilitated with MIODs.
https://edj.journals.ekb.eg/article_79228_acae0a28bf9bac40247705b3e548435e.pdf
2018-10-01
3641
3650
10.21608/edj.2018.79228
(Dental implants
Type 2 Diabetes
Immediate placement
Implant survival
Implant overdenture)
Dina
Elawady
1
Lecturer, Prosthodontist, Department of Removable Prosthodontics Faculty of Dentistry, Modern Science and Arts University (MSA), Egypt
AUTHOR
Reham
Osman
2
Lecturer, Prosthodontist, Department of Removable Prosthodontics, Faculty of Oral and Dental Medicine, Cairo University, Egypt.
AUTHOR
ORIGINAL_ARTICLE
Wear resistance of nano silica modified acrylic denture teeth and nano filled composite denture teeth
Artificial denture teeth are subjected to wear from daily masticatory functions. This wearaffects the denture esthetics, functions and in turn results in patient discomfort. The purpose ofthis study was to evaluate the wear resistance of nano composite fabricated artificial denture teethand conventional acrylic denture teeth reinforced with silica nano particles. A total number of60 samples were used. Samples were divided into equal four groups (n=15). The first group wasfabricated from nano filled composite. The second and third groups were silica nanoparticlesmodified acrylic denture teeth with two different concentrations 0.1% and 10% respectively. Thefourth group was conventional acrylic resin denture teeth and served as a control. The 2-bodywear testing was performed with a multi-modal ROBOTA chewing simulator. Wear was thenevaluated by the means of weight loss and surface roughness. The nano-composite group recordedsignificantly higher wear resistance than conventional and silica modified acrylic resin groups. Thesilica modified acrylic resin group with 0.1% concentration recorded a lower surface roughnessthan any of the other groups. In conclusion; Nano-composite teeth can be used as artificial dentureteeth exhibiting significant higher wear resistance than conventional and silica modified artificialacrylic teeth.
https://edj.journals.ekb.eg/article_79229_ce6927e6816cf82ec94ab075dad5a786.pdf
2018-10-01
3651
3659
10.21608/edj.2018.79229
Wear
Nano composite teeth
Acrylic resin teeth
Silica nanoparticles
Mohamed
Abdalla
1
Department of Dental Biomaterials, Faculty of Dental Medicine, Al-Azhar University Cairo (Boys)
AUTHOR
Muhammad
Masoud
2
Department of Dental Biomaterials, Faculty of Dental Medicine, Al-Azhar University Cairo (Boys)
AUTHOR
ORIGINAL_ARTICLE
THE EFFECT OF REMAINING CORONAL DENTIN WALL THICKNESS ON FRACTURE RESISTANCE OF ENDODONTICALLY TREATED TEETH RESTORED WITH POST AND CORE
Objectives. The aim of this study was to evaluate the effect of the remaining coronal wallthickness of dentin on fracture resistance of endodontically treated anterior tooth restored by castpost and glass fiber post and core.Materials & Methods. A total number of 100 human maxillary central incisors were collectedand stored in an isotonic saline solution at room temperature until used. Teeth were randomlydivided into 3 main groups control group (CG), group A and B. Control group 20 endodonticallytreated teeth (ETT) without post and core fabrication restored with full metal crown.Group A, 40 ETT restored by custom made casted metal post and core.Group A, subdivided into subgroup A1, subgroup A2 of 20 ETT and restored with metal crownof 0.5mm and 1.0mm finish line width respectively.Group B, 40 ETT restored by glass fiber post and composite core. Group B, subdivided intosubgroup B1, subgroup B2 of 20 ETT and restored with metal crown of 0.5mm and 1.0mm finishline width respectively. The prepared specimens were subjected to load testing using a universaltesting machine. The fracture pattern was observed and fracture load results were then statisticallyanalyzed using One-way analysis of variance (ANOVA ) in SPSS software.Results. The highest mean fracture load of 991.5±54.1 N for The control group CG followedby group A1 with a mean of 780.2±67.8 N and group A2with a mean of 521.5± 96.8 N then groupB1 with a mean of 489.24 ±30.61 N and the lowest mean fracture load of 388.32± 29.45 N was forgroup B2.Conclusion. The thickness of remaining coronal dentin affects the fracture resistance ofendodontically treated teeth received both casted metal and fiber post and core significantly.
https://edj.journals.ekb.eg/article_79230_a9d8c33fb163addbd9905d81731bf9c5.pdf
2018-10-01
3661
3671
10.21608/edj.2018.79230
Endodontically treated teeth
Cast post
Fiber posts
Ferrule effect
Mohamed
Mohamed
m.abdelrahman@tudent.edu.sa
1
Lecturer of Fixed Prosthodontics, Delta University For Science and Technology
AUTHOR
ORIGINAL_ARTICLE
Effect of Soft Liner Female Housings Retaining Mandibular Two Implant-Supported Overdentures on Hand Grip Strength and Patient Satisfaction in Egyptian Males
Introduction: Loss of natural teeth could make food consumption very difficult and leadsto malnutrition that is associated with muscle wasting. It is well known that implant-supportedmandibular overdentures increase the functional outcome, masticatory performance, nutritionalstatus and patient’s satisfaction compared with conventional complete dentures. The study aimedto evaluate the satisfaction and hand grip strength (HGS) for patients treated with two implantsupportedmandibular overdentures retained by soft liner female housings with either bar or ballattachments and opposed by maxillary conventional dentures.Materials and Methods: Twenty-one completely edentulous Egyptian males were selectedwith a mean age of 59.4 years and ranged between 53 and 67 years. Patients were allocatedrandomly into two groups: Group A (n=12) patients received Hader bar design connecting bothimplants in a straight line with soft liner female housing to retain the overdentures. Group B(n=9) patients received two ball patrices with soft liner female receptacles to retain the implantoverdentures. Patient satisfaction was measured by using 100 mm VA S questionnaire and Handgrip strength (HGS) was recorded by using handheld JAMAR dynamometer. Patients were recalledfor measurements at baseline with conventional dentures before implant placement (T0) and then6 months (T6) and 12 months (T12) after overdenture insertion. All statistical tests were 2-tailed atthe 5% level of significance.Results: From the pairwise statistical analysis, it was noticed that significant satisfaction VASvalues for bar group were higher in comparison to ball group in relation to retention and stability.Bar group revealed significantly higher HGS values from the baseline, while, Ball group exhibitedno significant differences between times of observation.Conclusion: Overdentures retained by soft liner around Hader bars splinting two implants maybe beneficial for edentulous patients with impaired nutritional status manifested by weak hand grip.
https://edj.journals.ekb.eg/article_79231_b92427168ff20a7b247c2318d1ca0246.pdf
2018-10-01
3673
3682
10.21608/edj.2018.79231
Elsayed
Abdel-Khalek
1
Lecturer of Removable Prosthodontics, Faculty of Dentistry, Mansoura University, Egypt.
AUTHOR
ORIGINAL_ARTICLE
Topographic Changes Of Two different Ni Ti File Systems After Multiple Uses
Aim: To study the topographic changes of protaper Next and Two Shape NiTi file systems afterthree uses.Materials and Methods: Four sets of Protaper Next and four sets of Two Shape files wereused to prepare MB canals of mandibular first molars. Twenty four mandibular first molars withnearly similar lengths (20 to 22 mm) and the mesiobuccal canals with curvature ranged from 20o -40o were used. All teeth were subjected to access cavity, MB canal localization, WL determinationand the teeth were randomly assigned to two groups, twelve for each according to the type of NiTirotary files used. Group I, twelve MB canals were prepared by using the four sets of Protaper NextNiTi rotary files. Group II, twelve MB canals were prepared by using the four sets of Two ShapeNiTi rotary files. Every set prepare three canals. All sets of Protaper Next including X1 & X2 andTwo Shape including TS1 & TS2 were scanned under SEM before and after canal preparation inthe same position at three parts: apical part, middle part and the critical point (3-5 mm from the filetip) and photographed. No visible defects, pitting, corrosion, fretting, micro cracks, fractures, metalstrips, spiral distortion, blunt cutting edges, disruption of cutting edges or fatigue cracks were thecriteria of surface deformations of files. All deformations were tabulated and compared before andafter root canal preparation.Results: PTN sets: one X1 showed disruption of cutting edges before and after use, one X1showed disruption of cutting edges after use, two X1 and four X2 files showed no visible defects.TS sets: one TS1 showed disruption of cutting edges before and after use, three TS1 showed novisible defects. One TS2 showed pitting before and after use, one TS2 showed corrosion after use,one TS2 showed disruption of cutting edges and micro cracks after use and one TS2 showed novisible defects.Conclusion: Based on the results of this study, it is safe to instrument up to three curved canalsby PTN or TS rotary NiTi files without file fracture.
https://edj.journals.ekb.eg/article_79233_cea1cfa04463feb27fad587dead1463c.pdf
2018-10-01
3683
3696
10.21608/edj.2018.79233
Protaper Next file
Two Shape file
Topographic changes
Multiple use
Soliman
Kamha
1
Lecturer of Endodontics, Faculty of Dentistry, Pharos University In Alexandria
AUTHOR
ORIGINAL_ARTICLE
Effect of Two Different Cleansing Agents on Color Stability of Thermoplastic Denture Base Material
Purpose: Researchers tried to improve the mechanical properties of poly methyl methacrylate(PMMA) denture bases. Development of alternative materials such as thermoplastic denture basematerials as polyamide had also been reported in the literature, however, it has not been well studiedregarding color stability. The aim of this in vitro study was to evaluate the effect of two differentcleansing agents on color stability of thermoplastic denture base material. Materials and methods:Thirty samples were fabricated from polyamide (Vertex Thermosens thermoplastic denture basematerial). Samples were divided into Three groups: 10 each. Group I (control group): soaked indistilled water, Group II: soaked in Corega cleansing agent and Group III: soaked in Efferdentcleansing agent. Results: Statistical non-significant results were found. A slight non-significanteffect on color stability was found more with Efferdent than Corega cleansing agent and water.Conclusion: Disinfecting polyamide denture base material (Vertex Thermosens) could be donesafely with Corega and Efferdent cleansing agents.
https://edj.journals.ekb.eg/article_79235_42be96b99f433a89210500834b131ed2.pdf
2018-10-01
3697
3702
10.21608/edj.2018.79235
polyamide
cleansing agents
color stability
Tamer
Mostafa
1
Lecturer, Psosthodontic Department, Faculty of Dentistry, Tanta University, Tanta, Egypt
AUTHOR
ORIGINAL_ARTICLE
Remineralization of initial enamel like lesions with chicken Egg Shell powder solution versus Amorphous Calcium Phosphate
Aim: To compare the efficacy of chicken egg shell solution powder (CESP) and amorphouscalcium phosphate (ACP) on the remineralization of enamel subsurface lesions.Materials and Methods: Twenty bovine central incisor teeth were used in this study. Themicrohardness and the minerals content of all specimens were initially assessed using Vickershardness tester and EDXA respectively (positive control group).The specimens were artificiallydemineralized and then reassessed directly after demineralization (negative control group). Alldemineralized specimens were randomly classified into 2 equal groups,group I :treated with Chickeneggshell powder solution (10 specimens), while, groupII: treated with ACP (10 specimens). Theremineralizing agent were applied twice daily for 15 min each for seven successive days. Finally allspecimens were reassessed for minerals content (Ca and PO4 weight %) and surface microhardness.The data were statistically analyzed using repeated measures analysis of variance (ANOVA ), thesignificance level was set at P ≤ 0.05.Results: Microhardness was significantly decreased in all specimens after demineralizationand then it was significantly increased after exposure to therapeutic solutions. There was asignificant increase (P<0.001) in both Calcium and Phosphorus levels after remineralization usingboth agents, as detected by EDAX. However, there was no significant difference between the tworemineralized groups.Conclusions: Within the limitations of this in vitro study, it can be concluded that bothremineralizing agents were similarly able to increase the microhardness and tooth remineralization.However, being natural products, CESP can be considered as an optimal alternative to thecommercial ones.
https://edj.journals.ekb.eg/article_79237_bdb3396a778f92391590856c0199bfc6.pdf
2018-10-01
3703
3712
10.21608/edj.2018.79237
demineralization
EDAX
Eggshell
enamel
remineralization
surface microhardness
Hebatallah
Taher
1
Associate Professor of Restorative Dentistry, Cairo University and Modern Sciences and Art in Egypt
AUTHOR
Rania
Bayoumi
2
Lecturer, Biomaterials Department, Faculty of Dentistry (girls), El-Azhar University
AUTHOR
ORIGINAL_ARTICLE
Accuracy of implant placement using three different surgical guides
Aim of the study: This study was done to evaluate and compare the accuracy of implantplacement using three differently constructed surgical guides (3D printed, laser sintered and CAD/CAM milled surgical guides).Materials and Methods: Eighteen implants were placed in partially edentulous patients havingmaxillary bounded edentulous areas. Based on the method of construction, patients were dividedinto three groups: group I, received 3D printed surgical guides, group II: received laser sinteredsurgical guides and group III: received CAD/CAM milled surgical guides. Implant placementevaluation included the difference between the planned and the actual implant sites regardingthe point of implant insertion (coronal deviation), apex position (apical deviation), and implantangulation (angular deviation)Results: The highest deviation values were obtained from group III (CAD/CAM milled surgicalguides) followed by group II (laser sintered surgical guides), while group I (3D printed surgicalguides) showed the least deviation values. There was a statistically significant difference betweengroup I (3D printed surgical guides)) and group III (CAD/CAM milled surgical guides) regardingcoronal deviation and apical deviation, also there was a statistically significant difference betweengroup II (laser sintered surgical guides) and group III (CAD/CAM milled surgical guides) regardingcoronal deviation and apical deviation, while there was no statistically significant difference betweengroup I (3D printed surgical guides) and group II (laser sintered surgical guides), besides there wasno statistically significant difference between the three groups regarding angular deviation.Conclusion: 3D printed surgical guides had the best accuracy (minimal deviation) followedby laser sintered surgical guides and the least accurate were the CAD/CAM milled surgical guide
https://edj.journals.ekb.eg/article_79239_1402765d5344527665c780051dec95b0.pdf
2018-10-01
3713
3721
10.21608/edj.2018.79239
surgical guides
3D printing
laser sintering
CAD/CAM milling
implant accuracy
Maha
Nagi
1
Lecturer, Removable Prosthodontics Department, Faculty of Dentistry, British University in Egypt
AUTHOR
ORIGINAL_ARTICLE
THE EFFECT OF MAGNETIC AND CM LOCK ATTACHMENTS ON STRAIN AROUND IMPLANTS RETAINED MANDIBULAR OVERDENTURE: A STRESS ANALY SIS STUDY
Objectives: This in-vitro strain gauge study was conducted to compare between magnetic andCM lock attachments regarding strain induced around two implants supporting a mandibular overdenture.Methodology: This study was performed using two implants 3.7mm x 12mm installed at thecanine area bilaterally in an acrylic model resembling a completely edentulous mandible. Pickup of the magnetic and CM loc attachments was done followed by loading and measurementsrespectively. The strain induced around the implants was evaluated during unilateral and bilateralloading at the first molar area using a universal testing machine. Measurements were tabulated andstatistically analyzed.Results: loading sides demonstrated significantly higher microstrains around the implants withthe two attachments than non-loading sides. CM LOC attachment showed significantly highermicrostrains than magnetic attachment for both loading and non-loading sides during unilateralloading. During bilateral loading, a statistically significant higher mean micro strain was recordedin the right implant than the left implant, CM lOC have shown a higher statistically significant meanmicro strain than the magnetic attachment for the right implant and no siginificant difference in theleft implant.Conclusions: Within the limitation of this in-vitro study, it could be conclude that the attachmenttype could have an effect on the amount of load that will be transmitted to the implants supportingan over denture. Clinical studies are required to evaluate the effect of type of attachment on periimplant crestal alveolar bone loss and correlate it with the results of the current study.
https://edj.journals.ekb.eg/article_79241_71673c74391bfe0d55258fab92f7b22a.pdf
2018-10-01
3723
3731
10.21608/edj.2018.79241
In-vitro
Strain gauge analysis
magnetic attachment
CM lock attachment Over denture
Nada
El khourazaty
1
Lecturer of Removable Prosthodontics, Faculty of Dentistry, Cairo University.
AUTHOR
ORIGINAL_ARTICLE
Effect of splinting on the accuracy of impressions of multiple straight implants in full arch rehabilitation: An in vitro-study
Objectives: This study was conducted to assess the effect of different splinting techniques(with and without sectioning of the splinting material) on the accuracy of impressions of multiplestraight implants in full arch rehabilitation cases.Materials and methods: A maxillary resin printed study model with five straight fixtures wasused as the master model. Open tray impression technique was done for all groups. Three groupswere defined according to splinting of the impression copings: Group A: Impression copings weresplinted to each other using autopolymerizing acrylic resin. Group B: Impression copings weresplinted to each other using autopolymerizing acrylic resin which was sectioned with a 0.3 mmthickness disc and reconnected with a second mix of resin. Group C: Impression copings were notsplinted to each other. For each group, five different impressions were prepared. The impressionswere poured to create the casts that were digitally scanned. The accuracy of the positions andangulations of the implants was evaluated using a computer-graphics coordinate measurementsystem.Results: Group A showed higher angular deviation compared to group B and group C. One wayANOVA showed statistically significant difference between the studied groups, P value was <0.001.However, Tukey post hock test showed statistically significant difference between group A and theother groups and no statistically significant difference between group B and group C. On the otherhand, regarding linear deviation one way ANOVA showed no statistically significant differencebetween the studied groups.Conclusion: Both split acrylic‑splinted and non-splinted implant impression techniques yieldmore accurate master casts regarding angular deviation compared to splinted impression techniquewithout splitting.
https://edj.journals.ekb.eg/article_79243_e4f448141bea4931a2d74b66869cf8fd.pdf
2018-10-01
3733
3739
10.21608/edj.2018.79243
Splinting
Implant impressions
accuracy of impressions
M.
Nabhan
1
Lecturer of Removable Prosthodontics, Faculty of Dentistry Ain Shams University.
AUTHOR
Yasmine
Thabet
2
Lecturer of Removable Prosthodontics, Faculty of Dentistry Ain Shams University.
AUTHOR
ORIGINAL_ARTICLE
Effect of Silica Coating with Different Luting Cements on the Bond Strength of a Zirconia Based Ceramic
Statement of the problem: Debonding is a common cause of failure in zirconia-basedrestorations. Despite the use of resin cements and surface treatments, the rate of success remainsto be questioned.Purpose: The purpose of this study was to evaluate the effect of surface treatment using asilica coating (Co-Jet) method with different luting cements on the shear bond strength to zirconiasamples. The hypothesis was that surface treatment with different luting cements will influence thebond strength at the ceramic-cement interface.Materials and Methods: In this study 30 zirconia samples were constructed and underwentsurface treatment using a silica coating method (Co-Jet system). Zirconia samples were then bondedto composite samples using different luting agents (Bifix QM, Panavia 2.0 and Multilink Automix).Samples underwent a thermocycling aging process before shear bond strength was tested.Results: The highest shear bond strength was recorded with the Panavia 2.0 group while thelowest was with the Bifix QM group.Conclusions: Within the limitations of this study, the use of a Co-Jet sand silica coating systemwith Panavia 2.0 showed superior bond strength than the other luting cements.
https://edj.journals.ekb.eg/article_79248_4f0a41f23491c7b1cd52eae2c371df01.pdf
2018-10-01
3741
3745
10.21608/edj.2018.79248
Zirconia
resin cement, silica coating, thermocylcing, shear bond strength
Ahmad
El-Kouedi
1
Associate Professor, Crown and Bridge Department Faculty of Dental Medicine for Boys - Al-Azhar University. Cairo. Egypt.
AUTHOR
Mohammed
Abd El-Aziz
2
Associate Professor, Crown and Bridge Department Faculty of Dental Medicine for Boys - Al-Azhar University. Cairo. Egypt.
AUTHOR
ORIGINAL_ARTICLE
Bonding Capacity of a Universal Adhesive in Different Etching Modes to Caries Affected Dentin Prepared by Two Caries Excavation Techniques
Objectives: The aim of the present study was to evaluate and compare the microtensile bondstrength (μTBS) and resin penetration into caries affected dentin (CAD), of a universal adhesivesapplied into two different etching modes (i.e. self-etch or etch-and-rinse), after caries excavationwith two methods, Round tungsten carbid bur CB or Carisolv chemomecanical caries removal(CMCR). Materials and Methods: Fourty human third molar teeth with moderate occlusal cariouslesions were collected. The selected teeth were cut parallel to the occlusal surface of the tooth toexpose the carious lesion. Teeth were divided into two groups (n=20) relative to the caries excavationmethods i.e. Group1: Carisolv CMCR and group 2: round (CB). Each group was subdivided intotwo subgroups (n=10) relative to the applied adhesive mode i.e. subgroup a: the adhesive systemwas applied in a self-etch mode (SE), while in subgroup b: the adhesive system was used in theetch & rinse mode (E & R). Following the application of the adhesive, Filtek Z350 XT resincomposite was applied incrementally onto the CAD. The bonded specimens were thermocycledfor 5000 cycles. The restored teeth were sectioned longitudinally to obtain bonded beams forμTBS. Beams were mounted into the universal testing machine. Bond strength, for each subgroup,was calculated and statistically analyzed. After debonding the beams, the fracture surfaces wereexamined under stereomicroscope to detect the failure modes. One beam, from the area of CAD,from each subgroup was selected for SEM examination. Results: Two-way ANOVA indicated highsignificances for caries excavation and adhesive modes factors (p <.0001). The highest mean valueof μTBS was recorded with CMCR , bonded with E & R mode , followed by CB method, bondedwith E & R mode, CMCR bonded with SE and CB and bonded with SE adhesive; respectively.Tukey’s test displayed that there is no significant difference in the μTBS between the groups bondedwith E & R adhesives, while CB method bonded with SE mode showed significant decrease in theμTBS value (p < 0.05), with all test groups. All the tested groups showed cohesive failure mode indentin rather than adhesive. In contrast, CB excavation method with SE mode displayed increasedadhesive mode of failure rather than the cohesive and mixed modes. Removal of the caries withboth methods and bonding with E & R adhesive resulted in relatively thin hybrid layer, but thickerwith CMCR, with moderate distribution of resin tags. SE mode of adhesion showed a relativelythick hybrid layer with short conical shaped resin tags. The dentinal tubules were at most occludedwith smear blugs and calcfic precipitates. Conclusions: Based on the limitation of this study, theresults showed that the use of Carisolv CMCR does improve the μTBS of universal adhesives toCAD, either in SE or E & R modes.
https://edj.journals.ekb.eg/article_79347_e5f548259ea9dec8d2e2736d99e44a76.pdf
2018-10-01
3747
3759
10.21608/edj.2018.79347
micro-tensile bond strength
caries excavation techniques
universal adhesives
Nadia
Zaghloul
nadiam.zaghloul@yahoo.com
1
Assistant Professor, Department of Operative Dentistry, Faculty of Dentistry, Mansoura University.
AUTHOR
ORIGINAL_ARTICLE
Assessment of adding Nano titanium oxide particles on Biomechanical behavior of High- temperature vulcanized Maxillofacial Silicone Elastomers
Objective: This study assessed the influence of titanium oxide nanofiller incorporation intoMDX4-4210 maxillofacial silicone regarding biomechanical changes.Methods: Nano titanium oxide powder (P25, Degussa, Germany) was mixed to hightemperature-vulcanized (HTV) silicone (MDX4-4210, Dow Corning, USA) at 0.2 wt%. For testingthe cytotoxicity, two groups of silicone specimens, ten specimens each were prepared. Group A:Blank MDX4-4210 silicone (control group); Group B: Nano titanium oxide powder was added toMDX4-4210 silicone; each group was assessed after 24, 48, and 72 hours. For testing mechanicalproperties 60 specimens were prepared, 20 for testing tear strength, 20 for testing ultimate tensilestrength, and 20 for testing hardness. Each group was subdivided into two identical categories: (I)10 control specimens without nano-titanium oxide, and (II) 10 experimental specimens with nanotitaniumoxide powder. The specimens were assessed and one way (ANOVA ) test was utilized toanalyze the data.Results: After 24-hour, in the control groups, the cytotoxicity values were higher than thoseof titanium oxide nanofiller group. There were marked improvements in the mean values of all thetested mechanical propertiesConclusion: incorporating nano-titanium oxide particles improves the biocompatibility andmechanical properties of MDX4-4210 maxillofacial silicone materials.
https://edj.journals.ekb.eg/article_79349_c6d1ab20d974b0777bd3aa614d536f70.pdf
2018-10-01
3761
3769
10.21608/edj.2018.79349
Cytotoxicity
Mechanical Properties
Silicone maxillofacial material
Nano titanium oxide filler
Mohamed
Abdelfattah
1
Lecture of Prosthodontics, Prosthodontic Department, Faculty of Dentistry, Tanta University
AUTHOR
Mohamed
Ebrahim
2
Ass. Prof of Biomaterial, Biomaterial Department, Faculty of Dentistry, Al Azhar University
AUTHOR
Mohamed
Mohamed
m.abdelrahman@tudent.edu.sa
3
Ass. Prof of Oral Pathology, Oral Pathology Department, Faculty of Dentistry, Al Azhar University
AUTHOR
ORIGINAL_ARTICLE
Marginal bone height changes around maxillary and mandibular implants supportin g All on four fixed detachable prosthesis. One-year prospective study
Purpose of the study: The aim of the present study was to investigate the marginal boneheight changes around maxillary and mandibular implants supporting all on four fixed detachableprosthesis after one year follow upMaterials and methods: six completely edentulous patients (4 males and 2 females) receivednew conventional maxillary and mandibular dentures and were asked to wear them for 3 monthsto enhance adaptation. Four implants were inserted in the maxillary (between the nasal sinuses)and mandibular (between the mental foramina) arch of each patient according to the All On fourprotocol. Implants were immediately loaded with provisional dentures after connection of multiunitabutments, and after 3 months of osseointegration temporary dentures were replaced by fixedceramo-metal prosthesis. Vertical marginal bone loss (VBL) was evaluated at the time of fixedhybrid prosthesis insertion, 6 and 12 months later using standardized peri-apical radiographs.Results: Maxillary anterior implants recorded significant higher VBL (P ≤ 0.005) thanmandibular implants after 6 months and 12 months of prosthesis insertion. Also, the maxillaryanterior implants showed significant VBL (P ≤ 0.005) than the posterior implants. For the posteriorimplants, no significant difference in VBL was observed between the maxillary and mandibularimplants. For the mandibular implants, no significant difference in VBL between the anterior andposterior implants was observed.Conclusion: Within the limitation of this short-term study, taking the small patient cohort intoaccount, it could be concluded that maxillary anterior implants supporting all on four fixed hybridprosthesis are at increased risk for marginal bone loss compared to maxillary posterior implants ormandibular implants.
https://edj.journals.ekb.eg/article_79350_662385133afc1d5ea0979260d711a7c2.pdf
2018-10-01
3771
3780
10.21608/edj.2018.79350
marginal bone
maxillary
mandibular
All on four
Ahmad
Shawky
ahmm14@yahoo.com
1
Associate Professor, Department of Removable Prosthodontics ,Faculty of Dentistry, Beni-suef University, Beni-suef, Egypt
AUTHOR
Mohamad
Helmy
2
Lecturer, Department of Removable Prosthodontics, Faculty of Dentistry, Assiut University, Assiut, Egypt.
AUTHOR
Hebatalla
El Afandy
3
Lecturer at Prosthodontic Department Faculty of Dentistry , Future University
AUTHOR
ORIGINAL_ARTICLE
Effect of Denture Cleansers on Retention Capability of Different Locator Attachments: In Vitro Study
Purpose: To evaluate the retention capability of three Locator attachments after soaking inthree different cleansing solutions.Materials & Methods: Three implants were embedded into acrylic block, Locator abutmentswere placed onto the implants. 120 locator attachments divided into three groups (40 each): pink,white and purple Locator attachments were soaked in different denture-cleansing solutions: (wateras control group, Efferdent, 5.25% Sodium Hypochlorite, Tantum Verde Mouthwash) ten eachfor a time resembling one year of clinical use. The Locator attachments were tested for load-todislodgement(retentive force; Newton) with a Universal Testing Machine. Data were collected,tabulated and statistically analyzed using Two Way ANOVA test followed by the Tukey’s HSD test(α ≤ 0.05).Results: There were no statistical significant differences between water, Efferdent and TantmVerde mouthwash (P>0.05) for all types of locator attachments while sodium hypochlorite gavestatistical significant lower retention values and retention loss percentage (P< 0.05) than thatimmersed in other solutions.Conclusions: Within the limitations of this study Efferdent and Tantum Verde mouthwash canbe used as denture cleanser while sodium hypochlorite is not recommended.
https://edj.journals.ekb.eg/article_79351_aa947f14fb5ae3f1c55725320f11a47d.pdf
2018-10-01
3781
3788
10.21608/edj.2018.79351
Denture cleanser
Locator attachment
Implant overdenture
Tamer
Mostafa
1
Lecturer, Prosthodontic Department, Faculty of Dentistry, Tanta University Tanta, Egypt.
AUTHOR
Hesham
Borg
2
Lecturer. Prosthodontic Department, Faculty of Dentistry, October 6 University, Egypt.
AUTHOR
ORIGINAL_ARTICLE
In-vitro assessment of physico-mechanical properti es of nanopartic le glass carbomer
Aim: This study was conducted to evaluate and compare the shear bond strength, water sorption,solubility, microhardness, and compressive strength of a recent product of glass ionomer(Glass Carbomer) compared to conventional glass ionomer.Materials and Methods: Twenty primary molars were utilized for assessment of shear bondstrength (SBS) test. Crown surfaces of the selected teeth were fixed in acrylic blocks then, groundwith water-cooled silicon carbide papers to obtain a flattened dentin surfaces. The specimens(n=20) were distributed into two equal groups according to the type of glass ionomer cement (GIC)bonded to the dentin surface (10/ each group): group I (Fuji IX GP) and group II (Glass Carbomer).To measure shear bond strength (SBS) a universal testing machine was used. For measurementof water sorption (WS) and solubility (SL) 10 specimens of each material were prepared and immersedin artificial saliva of pH 7 for seven days. The difference between initial and final weightwas estimated. Microhardness was estimated using a Vickers microhardness tester. Compressivestrength was evaluated using a universal testing machine.Results: No significant difference in shear bond strength and microhardness between bothmaterials. The water sorption, solubility and compressive strength of CAR (Glass Carbomer Fill)were significantly greater than that of Fuji IX.Conclusions: Glass Carbomer demonstrated some favourable results. Among these includethe higher compressive strength and comparable shear bond strength and microhardness of glasscarbomer, compared to conventional GIC. On the other hand glass carbomer showed higher watersorption and solublity than conventional GIC. Thus, glass carbomer holds a promise to be used asa potential restorative material particularly in pediatric dentistry.
https://edj.journals.ekb.eg/article_79354_cba137735a489a78bbfbc589dacdcff9.pdf
2018-10-01
3789
3800
10.21608/edj.2018.79354
Glass Ionomer
Restorative Material
Glass Carbomer cement
Shear bond strength
Water Sorption, Solubility
Microhardness and Compressive Strength
Eman
Elbahrawy
1
Lecturer of Dental Biomaterials, Department of Dental Biomaterials, Faculty of Dentistry, Tanta University, Tanta, Egypt
AUTHOR
ORIGINAL_ARTICLE
Effect of hesperidin on antibacterial activity and adhesive properti es of an etch-and-rinse adhesive system
Objectives: To evaluate the antimicrobial activity and adhesive properties of a simplified totaletchadhesive system containing different proportions of Hesperidin (HPN).Materials and Methods: Hesperidin was added to dental adhesive in three different ratiosproducing four experimental adhesive groups (0 [control], 0.2, 0.5, and 1%). The antibacterialactivity of the prepared adhesive groups was studied using agar disc-diffusion test againstStreptococcus mutans. The viscosity of dental adhesives was evaluated using a cone and plateviscometer. Microtensile bond strength was tested immediately and after thermocycling.The fracture patterns were examined using a stereomicroscope. Data were statistically analyzedusing ANOVA and Tukey HSD tests (α = 0.05).Results: The antimicrobial activity of HPN-incorporated experimental adhesives exhibiteda significant inhibitory effect against Streptococcus mutans compared with the control (P < 0.05).The viscosity of the experimental adhesives increased with increasing the concentrations of HPNincorporation into the adhesive. The incorporation of 0.2 wt% and 0.5 wt% HPN into the dentaladhesive significantly increased the immediate μTBS (P < 0.05). However, experimental adhesivesincorporating 1 wt% HPN showed no significant differences in the μTBS values compared with theunmodified adhesive resin (P > 0.05). After thermocycling, all studied adhesive groups revealedsignificant reduction in μTBS (p < 0.001).Conclusions: 0.5 wt% HPN incorporated dental adhesives could achieve a promisingantibacterial effect without adversely affect the adhesive characteristics; however, thermocyclingsignificantly reduced the μTBS.
https://edj.journals.ekb.eg/article_79355_67306ad0e8af927b63c7df7750a37b82.pdf
2018-10-01
3801
3812
10.21608/edj.2018.79355
Antibacterial activity
Hesperidin
microtensile bond strength
viscosity
Sayed
Ghorab
sayedghorab@yahoo.com
1
Lecturer, Dental Biomaterials Department, Faculty of Dentistry, Mansoura University, Egypt
AUTHOR
Ashraf
Ibraheim
2
Lecturer, Department of Operative, Faculty of Dentistry, Mansoura University, Egypt
AUTHOR
ORIGINAL_ARTICLE
Effect of different restor ative crowns on fracture resistance and stress distribution in single implants; An In-Vitro study
Statement of the problem. Implant failure due to poor biomechanical behavior is a commonproblem in dentistry. Occlusal overloading is considered the primary cause of peri-implantitis,implant and\or prosthesis fracture, and screw loosening or fracture.Purpose. The purpose of this study was to investigate the effect of different restorative crownson the fracture resistance and stress distribution in single implants.Materials and Methods. One implant was anchored in a measurement model based on areal-life patient situation simulating (D3) bone density. Strain gauges (SGs) were fixed mesially,distally, lingual and buccally adjacent to the implant. A total of 20 crowns were produced using aCAD\CAM machine and divided into two equal groups according to the material type; Zirconiaand (PEEK) (n=10). The magnitude of strain was recorded in microstrains (με). Each specimen wasloaded to fracture in a universal testing machine with a crosshead speed of 0.5 mm/min. Data wereanalyzed with 2-way univariate ANOVA and Tukey HSD test (α=.05).Results. The mean strain values for the two groups at the different (SG) sites ranged from (26.0to 1033.6 μm/m). The 2-way univariate ANOVA indicated statistically significant differences (P<0.001) between the zirconia and the (PEEK) crowns .In addition, Mean (SD) failure loads were2070.5(100.24) N for zirconia crowns, 950.75(34.61) N for (PEEK) crowns. The 2-way univariateANOVA showed a statistically significant difference for the fracture resistance between the zirconiaand (PEEK) crowns (P< 0.001).Conclusions: Superstructure materials appear to have an influence on strain development insingle implant restorations.
https://edj.journals.ekb.eg/article_79356_3f92ce9591a5718506b01ce99b3b492d.pdf
2018-10-01
3813
3822
10.21608/edj.2018.79356
Mazen
Attia
1
Lecturer of Fixed Prosthodontics, Faculty of Dentistry, Beni Suef University
AUTHOR
Haitham
Amr
2
Lecturer of Fixed Prosthodontics, Faculty of Dentistry, Fayoum University
AUTHOR
ORIGINAL_ARTICLE
Hygroscopic/Hydrolytic Kinetics of Two Bulk-fill Resin Composite Restorative Materials Stored in Different Media: An inVitro Comparative Study
Objectives: The aim of this study was to determine the effect of different storage mediaon Sorption/solubility kinetics of two bulk-fill resin composites, Venus bulk fill flowable resincomposite (VF) and Sonic Fill bulk fill resin composite (SF), stored in different media (alkalinewater Aw, 75% ethyl alcohol EA and lemon juice LJ).Materials and Methods: One hundred and twenty disc specimens were fabricated and dividedinto two main groups (n=60) involve two bulk-fill resin composites, depending on their lowviscosity. The specimens in each group were divided into three subgroups according to the storagemedia (n=20) i.e. alkaline drinking water, 75% ethyl alcohol and lemon juice. All specimens weredesiccated before storage to obtain a constant mass (m1) and volume (V) in mm3. Specimens weresubjected to 4 weeks immersion, then dried and reweighed again to obtain (m2). The specimens weredesiccated again to obtain constant mass (m3). Sorption and solubility’s properties’ in water werecalculated according to proposed formula by ISO 4049- 2009.Results: Two-way ANOVA indicated significant difference in sorption and solubility kineticsfor both factors, resin composites and immersion media (p<0.05). Tukey’s test showed that VFsignificantly absorb fluids than SF, regardless the storage media. The mean weight changes in theVF resin composite showed increasing fluid sorption after storage in AW, EA and LJ. There weresignificant differences between either AW or EA and LJ. For SF, fluid sorption is increased fromAW, followed by EA and LJ. Solubility of VF was significantly higher than SF, when stored ineach immersion medium. The mean weight loss in the VF resin composite showed insignificantincreasing solubility after immersion in AW , LJ and EA. The mean weight loss for SF revealedincreasing solubility after immersion in AW, LJ and EA. VF revealed higher significant fluidsolubility when stored in water, than in EA or LJ. EA cause significantly higher solubility of SFresin composite, than AW or LJ storage media,Conclusions: Within the conditions of this in-vitro study, the following conclusions weredrawn: The sorption and solubility behaviour of the resin composites is material dependent, as Venusflow bulk-fill resin composite tested in this study showed higher fluids sorption/solubility tendencythan that of Sonicfill bulk-fill resin composite. Regarding to the storage media, pH of the solutionsseems to have an influence on the sorption/solubility behavior of composite resin materials. Bothacidic and alkaline media increase sorption/solubility behaviour of the resin composites.
https://edj.journals.ekb.eg/article_79357_7ef4ad6838c28abcc96fe5d69b91d337.pdf
2018-10-01
3823
3831
10.21608/edj.2018.79357
Bulk-Fill resin composite
storage media
Sorption/solubility behavior
Nadia
Zaghloul
nadiam.zaghloul@yahoo.com
1
Assistant Professor, Department of Operative Dentistry, Faculty of Dentistry, Mansoura University.
AUTHOR
ORIGINAL_ARTICLE
Shear bond strength of pressed e-max laminate veneer cemented on surface treated zirconia substrate
The purpose of this study was to evaluate the shear bond strength of E-max pressed laminateveneers discs cemented to the surface treated of zirconia core discs for repairing porcelain veneerchipping situations. A total of 40 Zirconia discs (n=40) were divided into four groups accordingto their surface treatment. Then 40 laminate veneer e-max press discs were constructed andsubsequently cemented on the different treated surfaces. All specimen surfaces were prepared witha 30 μm fine diamond rotary cutting instrument with water irrigation for 10 s and dried with oilfreeair. Group 1: Control (n=10) where no surface treatment was applied. Group 2: The discssurfaces were treated using Cimara Zircon Repair system (Voco, Germany) (n=10). Group 3:The discs surfaces were conditioned with the zirconia primer Monobond plus (Ivoclar Vivadent)(n=10). Group 4: The disc surfaces were conditioned using CojetTM Repair system (3M ESPE)(n=10). Then each Laminate veneer was cemented in place using Rely x unicem self-adhesiveuniversal resin cement following the manufacturer recommendations. The samples were storedfor 24 hours in distilled water then subjected to shear bond strength test using a universal testingmachine to measure the adhesion strength between bonded e-max and zirconia surfaces. Thedebonded surfaces were examined using SEMicroscope to reveal the failure nature for each group.The zirconia surfaces were analyzed using EDX (energy dispersive x-ray) to reveal the dominantelements left on the surface after debonding. Data were collected, tabulated and statisticallyanalyzed with ANOVA test, followed by Tukey’s post hoc pairwise comparisons (α=0.01). Zirconiasurfaces treated with (Cimara Zircon Repair System) exhibited superior Shear bond strength values.With the limitation of this study it was found that all surface treatments used affected positively thebond strength between E-max laminate veneers and Zirconia.
https://edj.journals.ekb.eg/article_79358_08a43b51c0e266b470a351774f805834.pdf
2018-10-01
3833
3843
10.21608/edj.2018.79358
Zirconia
Chipping repair
Zirconia primer
Shear bond strength
e-max press veneer
monobond plus
Cimara Zircon Repair system
Cojet Repair system
Rely-x unicem
Ahmed
Ebeid
1
Lecturer of Fixed Prosthodontics, Faculty of Dentistry, MSA University, Egypt.
AUTHOR
ORIGINAL_ARTICLE
Surface topography and thickness of hybrid layer assessment after dentin pretreatment with egg shell powder as desensitizing agent
Objectives: The aim is to investigate the effect of Eggshell powder solution (ESPS)desensitizing agents as dentin surface pretreatments on thickness of hybrid layer of a direct resincomposite restoration bonded with etch and rinse adhesive systems.Methods: A flat dentin occlusal surface will be prepared on extracted molar using a low speeddiamond saw under water coolant. Teeth will be randomly divided into three main groups accordingto dentin surface pretreatment. First group, no dentin pretreatment (A1), second group Egg shellpretreatment applied before acid etching (A2) and third group, Egg shell pretreatment applied afteracid etching (A3). A Teflon mold will be used to build up resin composite directly. Teeth will besectioned perpendicular to adhesive joint to obtain 0.9±0.1 mm in thickness slabs. All sampleswill be examined under scanning electron microscope (SEM) and thickness of hybrid layer willbe measured. Moreover energy dispersive analytical x-ray (EDAX) analysis will be used to countdifferent minerals at tooth restoration interface.Results: The SEM analysis showed that; there are established significant differences inthe thickness of hybrid layers among all tested groups. The EDAX analysis showed increasedquantitative amounts of Ca atomic % and P atomic % for the ESS treated groups.Conclusion: Eggshell solution when used as desensitizing agent can significantly increase thehybrid layer thickness.
https://edj.journals.ekb.eg/article_79359_67ab62a5a7b6ff3a26a380cc48b5953b.pdf
2018-10-01
3845
3853
10.21608/edj.2018.79359
Eggshell powder
Dentin
Hybrid layer thickness
Desensitizing agent
Ramy
Abdallah
1
Lecturer of Dental Material, Faculty of Dentistry For Boys, Alazhar University, Egypt
AUTHOR
Hadeel
Farouk
2
Lecturer of Operative Dentistry, Faculty of Oral and Dental Medicine, Ahram Canadian University, Egypt.
AUTHOR
Mona
Essa
3
Associate Professor of Operative Dentistry, Faculty of Dentistry, Beni-Suef University, Egypt
AUTHOR
ORIGINAL_ARTICLE
Comparative study between conventional and mini dental implants of different diameters supportin g mandibular overdentures. A finite element stress analysis study
This study was conducted to provide an understanding of the biomechanical behavior ofdifferent diameters MDIs and compare it with conventional diameter implants when supportingan overdenture . Three different models were designed .The first model has two standard diameterimplants (3.8x12mm) (D1), the second (D2) has 2 mini-dental implants (2.4x12mm) and the thirdmodel (D3) has 2 of ultra-small diameter (1.8 x 12mm) all implants were placed at canines region.3D finite elements stress analysis was performed to evaluate biomechanical situation in both theimplants and the peri-implant bone under vertical and oblique loading of the overdentures. It can beconcluded that the stress values affecting the peri-implant bone and the implants are reciprocal todental implant diameter and the use of MDIs as overdenture abutments should be limited to caseswith limited bone quantity.
https://edj.journals.ekb.eg/article_79360_83034ce30de40d3347d85dcab734551a.pdf
2018-10-01
3855
3863
10.21608/edj.2018.79360
Sahar
Ghorab
1
Lecturer Prosthodontist, Faculty of Oral and Dental Medicine, Cairo University.
AUTHOR
Reham
Osman
2
Lecturer Prosthodontist, Faculty of Oral and Dental Medicine, Cairo University.
AUTHOR
ORIGINAL_ARTICLE
Effect of Different Kinematics of Rotary NiTi Instruments on Canal Transport ation in Curved Root Canals
Objective: This study was aimed to assess and compare between the transportation of ProtaperNext, WaveOne Gold and Twisted File Adaptive NiTi rotary systems on extracted curved molars.Methodology: A total of ninety mesial root canals of human first and second molars wererandomly divided into three experimental groups; Group I: Protaper Next/Continuous rotation(PTN/CR), Group II: WaveOne gold/Reciprocation (WG/R) and Group III: Twisted file Adaptive/adaptive motion (TFA ). Pre- and postoperative CBCT images were taken and fusion technique wasapplied to all specimens to ensure standardization. One-way ANOVA was used to compare betweenmore than two groups in parametric data. The significance level was set at P ≤ 0.05. Statisticalanalysis was performed with IBM® SPSS® Statistics Version 20 for Windows.Results: There was no statistically significant difference between all groups at the apical third.At the middle and coronal third group 3 revealed the highest transportation followed by groups 1and 2, which showed a statistically significant difference between them.
https://edj.journals.ekb.eg/article_79362_87a37683d533d161ca487415600a0dcd.pdf
2018-10-01
3865
3872
10.21608/edj.2018.79362
Amira
Ismail
1
Researcher of Endodontics, National Research Centre, Egypt
AUTHOR
Manar
Galal
2
Researcher of Endodontics, National Research Centre, Egypt
AUTHOR
ORIGINAL_ARTICLE
Assessment of the Quality Of Life and Patients’ Satisfaction in Egyptian Patients Wearing Facial Prostheses
Objectives: The aim of this study was to assess patients’ satisfaction and Quality of Life withfacial prostheses through a special designed questionnaire.Material and Methods: 120 patients using facial prostheses retained either by chemicaladhesives or bone anchorage implant for at least 6 months were asked to answer a twenty questionsquestionnaire through a cross-sectional survey. This questionnaire covered the appearance,retention means and effectiveness, awareness, self-confidence, difficulty of placement and removal,cleaning, restriction of social actions, pain and inflammation of tissues, and advice of the methodto other patients. Visual analogue scale (VA S) was used to show patient response. The mean of theanswers was converted into a percentage to symbolize the satisfaction index.Results: Wearing facial prostheses made most of patients happy (mean (SD) 9.4 (1.54)). Themost satisfied patients was those who had facial prosthesis retained by implants (p = 0.025), andadditional self-awareness was experienced in those retained by adhesives (p = 0.012). 72% ofpatients experienced no pain or troubles with the prosthesis during function. Both implant andadhesive retained prostheses have noticeable advantages without the presence of statisticallyconsiderable differences between them.Conclusions: The results showed that use of extraoral prostheses retained by adhesive or bybone anchorage implant provided a high level of satisfaction among patients.
https://edj.journals.ekb.eg/article_79363_738c443d822144d955aacc8cad129880.pdf
2018-10-01
3873
3881
10.21608/edj.2018.79363
Facial prosthesis
patient satisfaction
quality of life
Mohamed
Abdelfattah
1
Lecturer of Prosthodontics, faculty of Dentistry, Tanta University, Egypt.
AUTHOR
Tareq
Nabil
2
Lecturer of pediatric Dentistry, Preventive Dentistry and Dental Public Health, faculty of Dentistry, Suez Canal University, Egypt.
AUTHOR
ORIGINAL_ARTICLE
Comparison between Three Different Root Canal Rotary Instruments in retreatment: An in vitro study
Aim: The aim of this study was to compare Protaper Universal retreatment files, M-Pro, andTwisted files in retreatment.Methodology: Experimental groups were divided into three group; Group I: Protaper UniversalRetreatment (PTU; Dentsply Maillefer, Ballaigues, Switzerland), Group II: M-Pro (InnovativeMaterial and Devices, ShangHai, China), and Group III: Twisted File (TF; SybronEndo, Orange,CA). Each group was evaluated for time to reach the working length, amount of debris extrudedduring retreatment. Data were then collected, tabulated and statistically analyzed.Results: Statistical analysis showed that TF recorded the least time to reach the working length,while M-Pro showed the highest amount of debris extruded.Conclusion: Under the condition of the current study, TF was faster than M-Pro and PTU toperform gutta-percha removal in the retreatment of teeth. The use of M-Pro in retreatment increasedthe amount of apically extruded debris.
https://edj.journals.ekb.eg/article_79364_c562fa99e352dad90e42b6e520d969f2.pdf
2018-10-01
3883
3887
10.21608/edj.2018.79364
Shady
Hussein
1
Lecturer of Endodontics, Ain Shams University
AUTHOR
Amr
Bayoumi
2
Lecturer of Endodontics, Miser International University
AUTHOR
ORIGINAL_ARTICLE
A Cone-Beam Computed Tomography Study of Root Anatomy and Canal Morphology of Mandibular Incisors in an Egyptian Sub-Population
Endodontic treatment is basically dependent on knowledge of the root canal morphology. Thepurpose of this study was to analyze the root canal configuration of the mandibular incisor teeth inthe Egyptian subpopulation using cone-beam computed tomographic (CBCT) imaging. A total of1140 CBCT images of mandibular incisor teeth were obtained from 300 patients who were seekingto receive implant or orthodontic treatment and accepted CBCT projection. Vertucci’s classificationwas used as a reference to correlate the analysis. The number of roots, number of canals, and rootcanal type were calculated and plotted. The results showed that all the mandibular incisors revealedone root. The analysis of root canal number irrespective to canal configuration type revealed singleroot canal (90.2%, n= 53) out of 592 central mandibular incisors and (81.38% n= 446) out of548 lateral mandibular incisors. The prevalence of two root canals in mandibular lateral incisors(18.61%, n=102 out of 548) was significantly higher than that of mandibular central incisors (9.45%n=56 out of 592) (P< 0.5). Within the limitations of this study, it has been concluded that CBCTis efficient tool for mapping root canal configuration. The majority of the Egyptian subpopulationhave higher incidence of single canal in lower incisors. Most of two canal cases was type II.
https://edj.journals.ekb.eg/article_79365_9838c74193299fdc044c749bef6b836d.pdf
2018-10-01
3889
3894
10.21608/edj.2018.79365
Shady
Hussein
1
Lecturer at Endodontic Department, Faculty of Dentistry, Ain-Shams University
AUTHOR
Tarek
Mostafa
2
Lecturer at Endodontic Development, Faculty of Dentistry, Ain-Shams University
AUTHOR
ORIGINAL_ARTICLE
The effect of different irrigation materials and application techniques on push-out bond strength of fiber post to root dentin
Statement of the problem: Achieving a reliable bond to root canal dentin is a subject ofongoing research. Improving the bond strength between root dentin and fiber posts through differentirrigation materials and techniques used during post space preparation has been suggested; yet,there is a few data regarding the irrigation materials and application techniques that could be usedto achieve an optimum bond.Purpose: The aim of this invitro study was to evaluate the effect of different irrigation materials(NaOCl + EDTA and Qmix) and application techniques (syringe, passive ultrasonic irrigation, XPfinisher) on the push-out bond strength of fiber posts to root dentin.Materials and methods: Forty eight human premolars, with straight root canals and averageroot length of 17±1 mm were selected. The clinical crowns were cut 2mm above the cementoenameljunction. Root canal treatment was done with ProTaper universal rotary instruments to size F4 andthen obturated with lateral condensation technique and AdSeal sealer. Teeth were then stored indistilled water for 7 days at 37˚C after sealing of the access cavity with temporary filling free fromeugenol. For each tooth, post space preparation was done using gates glidden drills leaving 4-5 mmof gutta percha as apical seal. FibreKleer post tapered drill corresponding to the glass fiber postsize was used to remove any residual root filling. The prepared roots were equally and randomlydivided into two main groups (n = 18) before post cementation as follows; Group I: Irrigation with10 ml of 2.6% NaOCL over 60 seconds followed by 5 ml EDTA for another 60 seconds, Group II:Irrigation with 3 ml Q-mix for 60 seconds. Each of the two main groups was further divided into 3subgroups, Subgroup A (n = 6): Conventional syringe irrigation (IA, IIA), Subgroup B (n = 6):Passive ultrasonic irrigation (PUI) was performed for 60 seconds (IB, IIB), Subgroup C (n = 6):XP finisher was used with a torque-controlled motor according to the manufacturer’s instructions.The canal was filled with irrigant and the finisher was operated for 60 seconds using slow andgentle in-and-out movements (IC, IIC). All posts were tried-in, cleaned with alcohol, and thensilanized with ceramic primer for 60 seconds then air dried. Cementation was done using Rely XUnicem 2 self adhesive resin cement.After the luting procedure, the coronal part of the posts was covered completely with resinmodifiedglass ionomer cement and the roots were stored in distilled water for 7 days at 37˚C.Roots were embedded in epoxy resin and transversely sectioned perpendicular to the long axis ofthe root with an Isomet machine. It was pre-set to serially obtain six specimens (2 mm ± 0.1) thick,where two specimens corresponded to each root third. For push-out testing, each specimen wasmounted in a custom made loading fixture then subjected to compressive loading with the apicalsurface upwards at a crosshead speed of 1 mm/min via a computer controlled testing machine.The maximum failure load was recorded in Newton and converted into MPa. Two teeth as arepresentative of each subgroup were split longitudinally after post space preparation and irrigation,and smear layer was examined using scanning electron microscope at 1, 4.5, and 8mm levels fromthe apical to the coronal third of the post space at 1000 magnification. Data were recorded, tabulatedand statistically analysed.Results: Regarding the push-out bond strength results; it was found that regardless of applicationtechniques or radicular regions, there was no significant difference in the push-out bond strengthbetween both irrigation solutions as proven by three-way ANOVA test, where (NaOCl + EDTA ≥Q mix). Irrespective to irrigation solutions or radicular regions, there was significant difference inthe push-out bond strength between application techniques as demonstrated by three-way ANOVAtest , where (PUI ≥ XP > Syringe). Pair-wise Turkey’s post-hoc showed no significant difference inthe push-out bond strength between (PUI and XP). Regardless of irrigation solutions or applicationtechniques; there was no significant difference in the push-out bond strength between radicularregions as verified by three-way ANOVA test where (cervical ≥ apical ≥ middle). Regarding thesmear layer marking; it was found that there was non-significant difference between both irrigationsolutions as proven by Chi square test where (NaOCL+EDTA > Qmix). There was also nonsignificantdifference between irrigation application techniques as demonstrated by Chi square testwhere (Syringe ≥ PUI≥ XP). In addition, there was non-significant difference between radicularregions as verified by Chi square test where (apical ≥ middle ≥ cervical).Conclusions Within the limitations of this study it was concluded that:1. Q mix irrigation solution decreased the bond strength between root dentin and fiber postswhen self adhesive luting agent was used.2. The use of XP finisher and passive ultrasonic irrigation as irrigant activation devicesimproved the bond strength between root dentin and fiber posts compared to conventionalsyringe irrigation.
https://edj.journals.ekb.eg/article_79366_c9e338a93e0429e3d18d998ca075e963.pdf
2018-10-01
3895
3906
10.21608/edj.2018.79366
Sherif
Elkhodary
1
Lecturer of Endodontics, Faculty of Dentistry, Cairo University.
AUTHOR
Reham
Elbasty
2
Lecturer of Fixed Prosthodontics, Faculty of Dentistry Cairo University.
AUTHOR
ORIGINAL_ARTICLE
EFFECT OF MATERIAL TYPE ON THE STRESS DISTRIBUTION IN POSTERIOR THREE-UNIT FIXED DENTAL PROSTHESIS: A THREE-DIMENSIONAL FINITE ELEMENT ANALYSIS
Statement of the problem. Selection of the proper prosthetic restorative material is still a dilemma facing most of the clinicians.
Purpose. 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.
Materials and methods. 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.
Results. 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.
Conclusion. 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 materials
https://edj.journals.ekb.eg/article_79505_709f38dc6812e855d39d800a9199396a.pdf
2018-10-01
3907
3918
10.21608/edj.2018.79505
Mazen
Attia
1
Lecturer of Fixed Prosthodontics, Beni Suef University, Egypt.
AUTHOR
ORIGINAL_ARTICLE
EFFECT OF MAGNETIC ATTACHMENT FLUX ON SUB-GINGIVAL PIGMENTED BACTEROIDES MELANINOGENICUS COUNT IN MAGNETICALLY RETAINED OVERDENTURE WEARERS
Statement of problem: 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.
Aim of the study is recognition the effect of using dental magnetic attachment on subgingival Black pigmented Bacteroides.
Material and Method 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.
Results and Conclusion 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.pdf
2018-10-01
3919
3926
10.21608/edj.2018.79506
Dental Magnetic flux-Magnetically retained overdenture-Subgingival black pigmented bacteroides
Khaled
Amin
1
Associate Professor, Oral and Maxillofacial Prosthodontics Department, Faculty of Dentistry, King Abdulaziz University
AUTHOR
Sahar
Bukhary
2
Associate Professor, Department of Oral Biology, Faculty of Dentistry, King Abdulaziz University
AUTHOR
ORIGINAL_ARTICLE
ANALYSIS FOR THE EFFECT OF IMPLANT POSITION AND DENTURE BASE MATERIALS ON STRESS DISTRIBUTION IN SINGLE IMPLANT SUPPORTED MANDIBULAR OVERDENTURE (3D FINITE ELEMENT STUDY)
Purpose: 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.
Materials and methods: 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.
Results: 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.
Conclusion: 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.
Conclusion: These resuIts shouId onIy be used for comparative purposes between the two denture bases and cannot be viewed as a substitute for further clinical investigation
https://edj.journals.ekb.eg/article_79507_c8ac5384494fd4b2557cbedbdf4304bf.pdf
2018-10-01
3927
3934
10.21608/edj.2018.79507
Ahmed
Shaaban
1
Lecturer of Prosthodontics, Faculty of Oral & Dental Medicine, Future University
AUTHOR
M.
Ammar
2
Associate Professor of Prosthodontics, Faculty of dentistry, Al-Azhar University, Assiut branch.
AUTHOR
Ahmed
Mahrous
3
Associate Professor of Prosthodontics, Faculty of dentistry October 6th University, Egypt
AUTHOR
ORIGINAL_ARTICLE
EFFECT OF TWO DIFFERENT IMPRESSION MATERIALS ON THE ACCURACY OF THE MASTER CASTS OF PARTIALLY EDENTULOUS CASES (IN-VITRO STUDY)
Objectives: 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. Materials and Methods: 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. Results: 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. Conclusion: 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 accuracy
https://edj.journals.ekb.eg/article_79508_7d41eac7926f20e9df46972a96c7e54c.pdf
2018-10-01
3935
3941
10.21608/edj.2018.79508
accuracy of impressions
extended-pour alginates
polyether
Shaimaa
Lotfy
1
Associate Professor of Removable Prosthodontics, Faculty of Dentistry Ain Shams University.
AUTHOR
Yasmine
Thabet
2
Lecturer of Removable Prosthodontics, Faculty of Dentistry Ain Shams University
AUTHOR
ORIGINAL_ARTICLE
CYTOTOXICITY OF THREE ROOT CANAL SEALERS ON HUMAN FIBROBLAST CELLS (WI-38) AT DIFFERENT TIMES AND CONCENTRATIONS
Introduction: 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).
Methods: 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).
Results: 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.
Conclusions: 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.pdf
2018-10-01
3943
3948
10.21608/edj.2018.79509
Cytotoxicity
Root canal sealer
Fibroblast Cell
Khaled
Beshr
1
Lecturer of Endodontics, Faculty of Dentistry, Baniswif University
AUTHOR
Ramy
Abdelrahim
dr.ramydent@gmail.com
2
Lecturer of Dental Bio-Materials, Faculty of Dentistry, Al-Azhar University
AUTHOR
ORIGINAL_ARTICLE
BONE HEIGHT CHANGES AROUND IMMEDIATELY LOADED IMPLANT-RETAINED MANDIBULAR OVER DENTURES WITH TWO DIFFERENT OCCLUSAL SCHEMES
Purpose: 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
Materials and Methods: 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.
Results: 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.pdf
2018-10-01
3949
3956
10.21608/edj.2018.79510
dental implant
Lingualized Occlusion, Monoplane Occlusion, locator Attachment, Overdenture
Hossam
Nassar
1
Associated Professor of Removable Prosthodontics Department, Faculty of Dentistry, Future University in Egypt.
AUTHOR
Mai
Helmy
2
Lecture of Removable Prosthodontics Department, Faculty of Dentistry, Cairo University.
AUTHOR
ORIGINAL_ARTICLE
FINITE ELEMENT ANALYSIS OF STRESS DISTRIBUTION IN WEAKENED TEETH RESTORED WITH DIFFERENT POST CORE MATERIALS
Aim: 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. Methods: 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/mm2 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. Results: 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. Conclusion: 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.pdf
2018-10-01
3957
3963
10.21608/edj.2018.79511
weakened teeth
Finite Element Analysis
fiber reinforced composite
Doaa
Elsharkawy
1
Lecturer of Operative Dentistry, Faculty of Dental Medicine For Girls, Alazhar University, Egypt
AUTHOR
Mohamed
Attia
2
Lecturer of Mechanical Engineering, Faculty of Engineering, Cairo University, Egypt
AUTHOR
ORIGINAL_ARTICLE
SEALING ABILITY OF BIODENTINE AND SIMVASTATIN FOR REPAIR OF FURCATION PERFORATION USING DYE EXTRACTION METHOD
Aim: This study aimed to evaluate the sealing ability of Biodentine and Simvastatin for the repair of furcal perforation using dye extraction method. Materials and Methods: 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. Results: 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). Conclusion: Sealing ability of Biodentine is significantly better than Simvastatin in furcal perforation repair.
https://edj.journals.ekb.eg/article_79512_10338e9d6f53f03364540774c12a33f5.pdf
2018-10-01
3965
3971
10.21608/edj.2018.79512
Biodentine
dye extraction
perforation
sealing ability
Simvastatin
Neveen
Shaheen
1
Lecturer of Endodontics, Faculty of Dentistry, Tanta University, Tanta, Egypt
AUTHOR
Walaa
Ghoneim
2
Lecturer of Endodontics, Faculty of Dentistry, Tanta University, Tanta, Egypt
AUTHOR
ORIGINAL_ARTICLE
EFFECT OF THERMOCYCLING ON REPAIRED ZIRCONIA CERAMIC RESTORATIONS USING DIFFERENT BONDING AGENTS
Statement of the Problem: The clinical success of zirconia intra-oral repair depends on the strength of the bond between the zirconia core and veneering composite.
Purpose: 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.
Materials and Method: 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.
Results: 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.
Conclusion: 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 aging
https://edj.journals.ekb.eg/article_79513_8f52a1206ebe3cf860f059ef8e1877a2.pdf
2018-10-01
3973
3983
10.21608/edj.2018.79513
Zirconia
bond strength
Primer
Composite
Intra-oral Repair
Bonding agents
Shaimaa
Abo El-Farag
shaimaafarag@mans.edu.eg
1
Lecturer of Fixed Prosthodontics, Faculty of Dentistry, Mansoura University, Egypt
AUTHOR
Noha
El-WasAbdel
2
Associate Professor of Dental Biomaterials, Faculty of Dentistry, Mansoura University, Egypt
AUTHOR
ORIGINAL_ARTICLE
EVALUATION THE FATIGUE RESISTANCE AND COLOR STABILITY OF ACETAL RESIN AND BRE- FLEX (2nd EDITION) IN KENNEDY CLASS I REMOVABLE PARTIAL DENTURE. AN IN-VITRO STUDY
Purpose: This study was aimed to compare and evaluate the fatigue resistance and the color stability of polyoxymethylene (Acetal) and Bre-Flex (2nd edition).
Materials and Method: 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.
Results: 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=<0.0001<0.05).
Conclusion: 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.pdf
2018-10-01
3985
3994
10.21608/edj.2018.79514
Clasp
Acetal Resin
Bre-Flex 2nd edition
Fatigue Resistance, color stability
Mai
Helmy
1
Lecture, Removable Prosthodontics Department, faculty of dentistry, Cairo University
AUTHOR
ORIGINAL_ARTICLE
COMPARATIVE STUDY OF THE CYTOTOXICTY AND GENOTOXICITY OF SILVER ZEOLITE AND NANO SILVER
Silver 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 MTT cytotoxicity assay. 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 groups
https://edj.journals.ekb.eg/article_79515_e20b4fa2a09e59dab3e0ad19f6704c74.pdf
2018-10-01
3995
4002
10.21608/edj.2018.79515
Yousra
Nashaat
1
Associate Professor of Endodontics, October 6 University
AUTHOR
Soha
Hassan
2
Associate Professor of Cell Biology, October 6 Universit
AUTHOR
Ahmed
Labib
3
Associate Professor of Endodontics Tanata University
AUTHOR
Mostafa
Elaasar
4
Lecturer of Endodontics; October 6 University
AUTHOR
Ahmed
Negm
5
Lecturer of Endosontics; Ahram Canadian University
AUTHOR
ORIGINAL_ARTICLE
MICROTENSILE BOND STRENGTH AND NANOLEACKAGE OF DENTIN SURFACES PRETREATED WITH DIFFERENT ETCHING MATERIALS
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
https://edj.journals.ekb.eg/article_79516_10ebac853bbaa2c8b9a9ef6b9cda7d20.pdf
2018-10-01
4003
4012
10.21608/edj.2018.79516
Ahmed
A. Aziz
1
Lecturer of Conservative Dentistry, Faculty of Dentistry, Badr University in Cairo (BUC), Cairo, Egypt
AUTHOR
Heba
El Imam
2
Lecturer of Oral Histology , Faculty of Dentistry, Egyptian Russian University, Cairo, Egypt
AUTHOR
ORIGINAL_ARTICLE
PREVALENCE OF TAURODONTISM IN AN EGYPTIAN POPULATION PERMANENT MOLAR TEETH
Objectives: 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.
Aim: This study was aimed to investigate the Prevalence of Taurodontism in an Egyptian Population permanent molar teeth.
Study Design: 1560 patients, from age between 18 to 40 years old were examined by panoramic radiographs for the existence of taurodontism
Results: 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.
Conclusion: Taurodontism in the Egyptian population is relatively uncommon phenomena
https://edj.journals.ekb.eg/article_79517_4c65b9172e8cc7acafec9f810af5feb5.pdf
2018-10-01
4013
4017
10.21608/edj.2018.79517
Taurodontism
prevalence
permanent mandibular molars
permanent maxillary molars
Khaled
Beshr
1
Lecturer of Endodontics, Faculty of Dentistry, Beni Suef University
AUTHOR
Hossam
Mossa
2
Department of Restorative Dental Science, Alfarabi Colleges, Riyadh ‑ Kingdom of Saudi Arabia.
AUTHOR
ORIGINAL_ARTICLE
RETENTION AND FATIGUE RESISTANCE OF PEEK AND ACETAL THERMOPLASTIC RESIN CLASPS
Aim; 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.
Methods: 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).
Results. 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).
Conclusion: 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.pdf
2018-10-01
4019
4025
10.21608/edj.2018.79518
PEEK
Acetyl
Clasps
Insertion Force
Removable Partial Denture
Azza
El- Segai
1
Assistant Professor, Removable Prosthodontics Department, Faculty of Dentistry, Tanta University, Egypt.
AUTHOR
Muhammad
Abbas
2
Assistant Professor, Dental Biomaterials Department, Faculty of Dental medicine, Al-Azhar University, Egypt
AUTHOR
ORIGINAL_ARTICLE
IMPACT OF DENTIN CONDITIONING ON SHEAR BOND STRENGTH OF SELF-ADHESIVE RESIN CEMENT
Statement of the Problem: The clinical success of fixed dental prosthesis depends on the bond strength between the prepared tooth and the luting cement.
Purpose: To estimate the bond strength of self-adhesive resin cement to dentin of prepared teeth using different conditioning methods.
Materials and Methods: 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.
Results: 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).
Conclusion: 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.pdf
2018-10-01
4027
4037
10.21608/edj.2018.79519
conditioning materials
adhesive resin cement
composite discs
bond strength
Shaimaa
Ibraheim
1
Lecturer at Department of Fixed Prosthodontics, Faculty of Dentistry, Mansoura University, Egypt
AUTHOR
ORIGINAL_ARTICLE
CLINICAL EVALUATION OF ROOT CANAL OBTURATION QUALITY USING TWO DIFFERENT SEALERS AND OBTURATION TECHNIQUES BY CONE BEAM COMPUTERIZED TOMOGRAPHY (IN-VIVO STUDY)
Introduction: 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.
The purpose of this study was to evaluate quality of two different root canal sealer and filling techniques using cone beam computerized tomography (CBCT)
Materials and methods: 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.
Result: 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.
Conclusions: 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.pdf
2018-10-01
4039
4048
10.21608/edj.2018.79521
CBCT
root canal filling
MTA fill apex
AH-plus
continuous wave technique
single cone technique
Samia
El-Shereif
1
Associate Professor of Endodontics, Faculty of Oral and Dental Medicine, Cairo University.
AUTHOR
Mohamed
Rabie
2
Lecturer of Endodontics, College of Dentistry, Suez Canal University
AUTHOR
ORIGINAL_ARTICLE
COMPARATIVE EVALUATION OF MICROLEAKAGE AND SHEAR BOND STRENGTH OF BIOACTIVE DENTIN SUBSTITUTE AND NANOHYBRID COMPOSITE RESIN
Background: 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.
Aim: To compare the microleakage and bond strength for teeth restored with Activa Bioactive restorative and nanohybrid composite resin
Materials and methods: 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.
Results; There was non-significant difference between ACTIVA bioactive restorative group and nanohybrid composite resin group in both parameters; leakage and bond strength
Conclusion: 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
https://edj.journals.ekb.eg/article_79522_d60c6b4a0cabdfef451947196327b96a.pdf
2018-10-01
4049
4056
10.21608/edj.2018.79522
Active Bioactive
Non-Curious Cervical Lesions
Microleakage
Ola
Barakat
1
Associate Professor, Department of Operative Dentistry, Faculty of Oral and Dental Surgery, Misr University For Science and Technology. Egypt
AUTHOR
Muhammad
Samman
2
Associate Professor Dental Biomaterials Department , Faculty of Dental Medicine, Al Azher University, Cairo, Egypt.
AUTHOR
ORIGINAL_ARTICLE
ADJUNCTIVE USE OF HYALURONIC ACID WITH SCALING & ROOT PLANING IN TREATMENT OF CHRONIC PERIODONTITIS PATIENTS WITH DIABETES MELLITUS TYPE 2: A RANDOMIZED CONTROLLED TRIAL
Objective: 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.
Subjects &Methods: 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.
Results: 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).
Conclusion: 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
2018-10-01
4057
4065
10.21608/edj.2018.91765
Hyaluronic acid
Chronic Periodontitis
scaling & root planning
Diabetes mellitus type 2
Gihane
Madkour
1
Associate Professor, Oral Medicine and Periodontology Department, Faculty of Dentistry, Cairo University - Egypt
AUTHOR
Ibrahim
EL Refaie
2
Lecturer, Oral Medicine & Periodontology Department, Faculty of Dentistry, Cairo University - Egypt
AUTHOR
Basma
Mostafa
3
Associate Professor, Surgery and Oral Medicine Dep., Oral and Dental Research Division, National Research Centre, Cairo - Egypt
AUTHOR