The Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948466Issue 3 - July (Fixed Prosthodontics, Removable Prosthodontics and Dental Materials)20200701Effect of Re-Pressing of Lithium Disilicate Ceramic with different weight percentages on Colour, Translucency & Shear Bond Strength to veneering material1627163610524110.21608/edj.2020.35039.1169ENShereen KotbSalemFixed Prosthodontics October 6 University, Giza, Egypt0000-0002-6423-8259Mohammed MoustafaShalabyFixed prosthodontics department, Faculty of dentistry, Minia University, Minia0000-0003-2673-0397Journal Article20200707Aim:Investigate effect of repressing of Lithium disilicate ceramic with different weight percentages on color,translucency & bond strength with veneering material. <br /> Materials & Methods:Thirty discs were constructed & divided according to weight percentage of newly pressed & repressed ceramic.Group1 samples were 100%new ceramics. Group2 discs were 75%new,25% repressed ceramic. Group3 samples were 50% new,50%repressed ceramic. Group4 samples were 25%new,75%repressed ceramic. Group5 discs were 100%repressed ones.One sample from each group was randomly selected for SEM test.The remaining discs in each group(5 samples)were used to test color & translucency, then these samples were veneered with porcelain & subjected to shear bond strength test.<br /> Results:Results showed ΔE of the tested groups were in the clinical accepted range except the 100%repressed group.There was no significant difference between all tested groups as related to translucency.As regard bond strength, there was no significant difference between 100%new group & the 75%new+25%repressed group. No significant difference was recorded between the 75%new+25%re-pressed group and the 50%new+50%re-pressed group.There was a significant difference between 100%new group & 50%new + 50%repressed group which was also different than 25%new+75%re-pressed group.There was a significant difference between the 100%re-pressed group & the 25%new+75%re-pressed group.<br /> Conclusions:The mix of new ingot with repressed ceramic are in the clinical acceptance range as regard ΔE.The 100 % re-pressing ceramic can affect the final colour.Ceramic repressing has no significant effect on translucency.Weight percent of repressed ceramic has a direct effect on bond strength to veneering material as increasing the percentage of repressed ceramic led to a decrease of bond strength values.https://edj.journals.ekb.eg/article_105241_80e52f37e4918311e4a837947ee72564.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948466Issue 3 - July (Fixed Prosthodontics, Removable Prosthodontics and Dental Materials)20200701Influence of sandblasting parameters and luting materials on microshear bond strength to a CAD/CAM hybrid ceramic material1637164810524310.21608/edj.2020.24097.1123ENSayedGhorabDepartment of Dental Biomaterials, Faculty of Dentistry, Mansoura UniversityDinaFarahatDepartment of Dental Biomaterials, Faculty of Dentistry, Mansoura UniversityJournal Article20200506Objective: To assess the influence of sandblasting parameters (applied pressure and grain<br /> particle size) on the microshear bond strength (μSBS) of Vita Enamic (VE) CAD/CAM hybrid<br /> ceramic to two different resin cements.<br /> Materials and Methods: One-hundred VE specimens were fabricated and allocated to 5 pretreatment groups (n=20/group): no treatment, 50 μm Al2O3 (2 bar), 50 μm Al2O3 (3.5 bar), 110 μm Al2O3 (2 bar) and 110 μm Al2O3 (3.5 bar). After pretreatment, surface roughness (Ra) was determined using a profilometer. The topography of pretreated surfaces was examined with Scanning Electron Microscopy (SEM). Each group was further divided into two subgroups according to type of luting material; subgroup (a): G-CEM LinkAce and subgroup (b): Single bond universal and RelyX Ultimate. After bonding, μSBS was measured with a Universal Testing Machine. Data were statistically analyzed using ANOVA and Tukey HSD tests (α=.05).<br /> Results: Specimens air-abraded with 110 μm Al2O3 and pressure 2 bar showed the highest but insignificant μSBS compared to other sandblasted groups (P < 0.05). μSBS values (MPa) improved in the following order: 110 μm (2 bar) > 50 μm (2 bar) > 110 μm (3.5 bar) > 50 μm (3.5 bar) > control. Regardless the Al2O3 size, μSBS improved when sandblasting pressure was 2 bar while decreased with 3.5 bar groups. RelyX Ultimate showed higher μSBS than G-CEM LinkAce.<br /> Conclusions: Sandblasting of VE surface by (2 bar) pressure and the use of conventional resin cement in association with universal adhesive system were required to achieve satisfactory bond strength values.https://edj.journals.ekb.eg/article_105243_f5272f6667b70aed28a18b7df2d9bc6a.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948466Issue 3 - July (Fixed Prosthodontics, Removable Prosthodontics and Dental Materials)20200701Physical properties of an endodontic sealer containing calcium silicate1649165510524410.21608/edj.2020.26646.1087ENMai HeshamAbd El Rahmandental biomaterials, october university for modern sciences and arts, october, cairoMennatullah MohamedKhalildental biomaterials, fayoum university, cairo, egyptSaraEl Mallahendodontics, fayoum university, cairo, egyptJournal Article20200401Summary<br /> Background: The main objective of endodontic therapy is to adequately clean and seal the root canal system. According to Grossman et al, idealistically root canal sealers must be dimensionally stable, produce a tight seal after setting and exhibit an adequate setting time. They should also be insoluble and provide adequate adhesion with the root canal walls.<br /> Therefore, the present study was conducted to evaluate some physio-chemical characteristics of novel poly-dimethyl-siloxane gutta-percha calcium-silicate containing sealer (GuttaFlow bioseal) in contrast with a commercially available zinc oxide and eugenol sealer (ZnO/E).<br /> Materials and Methods: Flow, setting time, working time, film thickness and dimensional changes were evaluated for Guttaflow bioseal and contrasted to a commercially available zinc oxide and eugenol sealer (ZnO/E) following the ADA specification number 57.<br /> Results: In Flow, setting time and working time tests; ZnO/E sealer showed higher mean values than that of GuttaFlow bioseal with an extremely significant difference, while film thickness of GuttaFlow bioseal was significantly higher than that of ZnO/E sealer. Results of dimensional changes test showed a significant difference between both sealers, where GuttaFlow bioseal exhibited a positive mean value, while ZnO/E exhibited a negative mean value.<br /> Conclusions: It can be concluded that; GuttaFlow bioseal might be an acceptable substitute to zinc oxide and eugenol sealer. New researches in-vivo and in-vitro should be postulated for better interpretation of the physical properties of endodontic sealers.https://edj.journals.ekb.eg/article_105244_daa90251323cdaabfc710a4353f8bb1e.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948466Issue 3 - July (Fixed Prosthodontics, Removable Prosthodontics and Dental Materials)20200701Effect of Different Immersion Solutions on Color Stability of One Bulk-Fill Resin Composite and Two Types of CAD/CAM Ceramics1657166510524510.21608/edj.2020.26795.1090ENMostafa ElsayedAboushahbaLecturer Fixed Prosthodontics Faculty of Oral and Dental Medicine Future University in Egypt, Cairo, Egypt0000-0002-4407-2570Sara HanyYounisLecturer, Department of Conservative Dentistry, Faculty of Oral and Dental Medicine, Future University in Egypt, Cairo, Egypt0000-0001-6327-4568Rasha HassanAfifiLecturer, Conservative Dentistry Department, Faculty of Oral and Dental Medicine, Future University in Egypt, Cairo, Egypt0000-0002-1869-3824Journal Article20200328Objective: This study aimed to evaluate the effect of immersion solutions on color stability of two thicknesses of bulk-fill composite and two CAD/CAM ceramics.<br /> Materials and methods: One Bulk-fill (X-tra fil) composite (2 and 4mm increment) and two types of CAD/CAM ceramics (ViteEnamic and VitablocsMark II) were used. Forty two composite specimens were prepared with two different thicknesses, also twenty-one specimens of each ceramic material (2 mm in thickness) were prepared for color change evaluation after immersion in distilled water, cola and coffee. Kruskal-Wallis test was used to compare between materials as well as to compare between immersion solutions. Dunn’s test was used for pair-wise comparisons when Kruskal-Wallis test is significant. The significance level was set at P ≤ 0.05.<br /> Results: In distilled water there was no statistically significant difference between values of composite and vitaenamic, both were statistically higher than vitamark II, with cola X-trafil 2 mm showed the statistically significantly highest median ΔE, 4 mm showed statistically significantly lower median value, there was no statistically significant difference between ceramics; both showed the statistically significantly lowest median ΔE values. With coffee there was no statistically significant difference between X-trafils; both showed the statistically significantly highest median ΔE values, and no statistically significant difference occurred between ceramics; both showed the statistically significantly lowest median ΔE values.<br /> Conclusion: Composites are unable to retain the color they possessed after storage, but the color of both types of ceramic is stable even after immersion and storage in distilled water, cola and coffee.https://edj.journals.ekb.eg/article_105245_456e09367b03b937035f7ad6a2f1ef48.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948466Issue 3 - July (Fixed Prosthodontics, Removable Prosthodontics and Dental Materials)20200701Clinical comparative evaluation of different retraction systems in gingival displacement and their influence on periodontal health: A randomized clinical trial1667167810524610.21608/edj.2020.26079.1076ENMarwaBeleidyFixed Prosthodontics Department, Faculty of Dentistry, October 6 Univeristy, Giza, Egypt.0000-0001-9381-2005Asma M.Serag ElddienDepartment of Periodontology, Faculty of Dentistry, October 6th University, Giza, Egypt.Journal Article20200317Purpose:This randomised clinical study was to assess cordless techniques compared to conventional cords in gingival displacement and effect on periodontal health.<br /> Material and Methods: Forty participants having a premolar abutment were elected following inclusion criteria and allocated by using parallel randomization into four groups (n=10) for gingival retraction either with Ultrapak, GingiTrac, Traxodent or NoCord. By single-blinded operator, the horizontal gingival displacement as a primary outcome was measured on pre- and post-retraction polyether impressions utilizing a stereomicroscope. As secondary outcomes, the placement time and bleeding after removal were noted. The periodontal parameters; plaque index, gingival index (GI), and probing depth (PD) were recorded pre-operative, 1- and 7-days post-operative. <br /> Results: There was a non-significant gingival displacement difference among groups (P=.282) and a significant difference within each group. GI elevated in all groups after one day as Traxodent exhibited the highest value (p<.001). After seven days, it returned to a non-significant value compared to the baseline except for GingiTrac and Traxodent which were significantly higher (p<.001). PD of Ultrapak and GingiTrac were non-significant in all-time hiatuses, while Traxodent and NoCord revealed a significance. After seven days, Traxodent showed higher PD than the baseline (p<.001). Ultrapak induced maximal bleeding (50%), while NoCord showed no bleeding. <br /> Conclusion: Cordless retraction systems showed similar horizontal gingival displacement compared to conventional cords.NoCord can be considered an alternative retraction system, providing an effortless placement, good gingival displacement and no bleeding. All techniques induced an interim gingival inflammation; Traxodent showed the highest level. GingiTrac and Traxodent demonstrated delaying recovery.https://edj.journals.ekb.eg/article_105246_17f50a4df4a1fb49163173f0bfdfcaa8.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948466Issue 3 - July (Fixed Prosthodontics, Removable Prosthodontics and Dental Materials)20200701Color Stability Assessment of Innovative Technique of Complete Denture Flasking using Silicone Mask Technique (Case-Control Study)1679168610524710.21608/edj.2020.28397.1111ENShadyEl NaggarRemovable prosthodontics department, faculty of oral and dental medicine, South Valley University000-0002-7809-7354Ahmed MostafaEsmatFixed and Removable Prosthodontics Department, National Research Center000-0001-5205-9221Ayman FathyElawadyFixed and Removable Prosthodontics Department, National Research CenterJournal Article20200421Background: Treatment challenges for completely edentulous patient have traditionally been described as a combination of esthetics, function and comfort. Some studies regarding complete denture esthetics were more important than function or comfort. Denture characterization is modification of the form of the denture base to produce a more natural appearance. Materials and Methods: Acrylic resin complete dentures had been divided into two groups according to flasking technique (group I as control group: conventional three pour flasking technique, group II as test group: silicone mask flasking technique). ΔE was calculated for both groups immediately and after seven days of exposure to different staining conditions (Smoke, Coffee and Tea). Results: Heat cured acrylic resin complete denture processed through silicone mask flasking technique showed statistically significant lower ΔE values (as P < 0.05) than conventionally processed heat cured acrylic resin complete denture. Conclusion: With the limitations of this study regarding color stability change (ΔE), depending on flasking technique; the conventional three pour flasking technique showed a higher amount of color change (lower color stability) than the silicone mask flasking technique regarding smoking, tea and coffee coloring agents.https://edj.journals.ekb.eg/article_105247_71dc2513cd80fed9f3029e3fc57c17c9.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948466Issue 3 - July (Fixed Prosthodontics, Removable Prosthodontics and Dental Materials)20200701Three-dimensional marginal bone loss around implants supporting metal ceramic and metal acrylic screw retained hybrid prosthesis for rehabilitation of atrophied mandible. A cone beam radiographic study1687169710524810.21608/edj.2020.29331.1140ENShahinaz SayedMohamedDepartment of Prosthodontics ,faculty of dentistry, Beni-Suef university, Egypt.0000-0003-4468-5307Amr Abd EL BaryEmarahDepartment of Removable Prosthodontics, Faculty of Dentistry, Fayoum University, Fayoum, Egypt0009-0008-5856-6505Journal Article20200613Purpose:evaluate three-dimensional marginal bone loss around implants supporting metal ceramic and metal acrylic screw retained hybrid prosthesis for rehabilitation of atrophied mandible using (CBCT) after one year.<br /> Materials and methods: Ten completely edentulous patients with mandibular ridge atrophy were randomly assigned into 2 groups; Group I; included 5 patients who received Metal ceramic screw retained hybrid prosthesis, Group II; included 5 patients who received Metal acrylic screw retained hybrid prosthesis. All patients then received 4 implants in the inter-foraminal area of the mandible using the flapless surgical approach. After osteointegration, implants were loaded by the prostheses with a distal cantilever not exceed 1.5 antro-posterior spread. Vertical and horizontal bone resorption was assessed at mesial, distal, buccal and lingual aspect of anterior and posterior implants using (CBCT) at time of prosthesis insertion (baseline), 6 months and one year later.<br /> Results: After 6 and 12 months, metal ceramic prosthesis showed significant higher vertical and horizontal bone resorption than metal acrylic prosthesis for anterior and posterior implants. Posterior implants showed significant higher vertical and horizontal bone resorption than anterior implants for metal ceramic group only and no difference in bone loss between anterior and posterior implants in metal acrylic group was noted. For both groups and implant positions, vertical and horizontal bone resorption at 12 months significantly increased compared to 6 months<br /> Conclusion: metal acrylic cantilevered prosthesis for screw retained hybrid restoration of edentulous atrophied mandible may be recommended than metal ceramic prosthesishttps://edj.journals.ekb.eg/article_105248_739aa6ea326e873171f7bf146036013e.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948466Issue 3 - July (Fixed Prosthodontics, Removable Prosthodontics and Dental Materials)20200701Clinical and radiographic outcomes of stress-free implant (SFI) bars and Milled bars for early loaded implant supported mandibular overdentures. A one-year randomized trial1699171010524910.21608/edj.2020.24775.1046ENNasser HusseinShaheenDepartment of Removable Prosthodontics, College of Oral and Dental Surgery, Misr University for Science and Technology, Cairo, Egypt.Journal Article20200227Objectives: The aim of the present trial was to compare clinical and radiographic outcomes of stress-free implant(SFI) bars and Milled bars for early loaded implant supported mandibular overdentures. <br /> Materials and methods:Ten completely edentulous participants were selected. Patients were allocated in 2 groups :group 1 include 5 patients who received milled bar overdentures, and group 2 include 5 patients who received SFI bar overdentures. Four implants were inserted according the flapless surgical protocol in canine and frist molar areas and early loaded by milled bar(group 1)or SFI bar(group2) 2weeks after implant placement. Plaque and gingival indeces, pocket depth, fixture stability, and peri-implant bone resorption were measured at base line, 6 and 12months after prostheis delivery. <br /> Results:The survival rate was 95% and 100% for milled bar and SFI bar groups respectively. Plaque index and pocket depth significantly increased with passage of time for milled bar group only and SFI bar showed no difference in these parameters between observation times. Bone loss increased from 6 to 12 months significantly in both groups. No significant difference in gingival index and fixture stability between observation times or between groups were noted. Milled bar group showed significant higher plaque, pocket depth, and bone resorption than SFI bar group after 6and 12months. <br /> Conclusion:Within the limitation of this randomized trial, it could be concluded that SFI bar is more advantageous for early loaded 4 implants supporting mandibular overdentures than milled bar as it was associated with decreased plaque accumulation, pocket depth and marginal bone resorption after one year.https://edj.journals.ekb.eg/article_105249_2fe43b59aa4f5e64edd231195397e192.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948466Issue 3 - July (Fixed Prosthodontics, Removable Prosthodontics and Dental Materials)20200701Effect of Maxillary Obturator on Quality of Life in Patients after Maxillary Resection1711172910525010.21608/edj.2020.24825.1053ENAhmed MostafaAbdelfattah MohamedLecturer of Oral and Maxillofacial Prosthodontics, Faculty of Dentistry, Ain Shams University, cairo,Egypt0000-0001-9911-7644MarwaKothayerLecturer of Oral and Maxillofacial Prosthodontics, Faculty of Dentistry, Ain shams University, Cairo, Egypt.
Assistant Professor of Oral and Maxillofacial Prosthodontics, College of Dentistry, Taibah University, Al-Madinah Al-Munawarah, Saudi Arabia.0000-0002-6855-3256Journal Article20200227Aim: The aim of this study was to assess quality of life of patient with maxillectomy after wearing maxillary obturators using the Obturator Functioning Scale (OFS).<br /> Methodology: Fourty patients who underwent surgical resection of the maxilla were selected, randomized into two groups. In one group, the patients were rehabilitated with a maxillary obturator that was having a silicone bulb while in the second group, they received a conventional maxillary obturator with an acrylic bulb. A questionnaire that included the indices of the Obturator Functioning Scale (OFS) was used to evaluate the functional rehabilitation of patients in the study as it was given twice to each patient; one time before fabrication of the obturator and the second time after its construction.<br /> Results: obturator fabrication resulted in significant improvement of all the domains of the obturator functioning scale questionnaire in each group. However, on comparing the effect of both types of the obturator on the quality of life, there was no statistical significance.<br /> Conclusion: within limitation of this study, quality of life in patients after maxillary resection could be improved using maxillary obturatorshttps://edj.journals.ekb.eg/article_105250_76c05622d98d5a91b60aed983178f7a4.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948466Issue 3 - July (Fixed Prosthodontics, Removable Prosthodontics and Dental Materials)20200701Effect of pre-heating on hardness, flexural properties and depth of cure of dental two resin composites1731173910525110.21608/edj.2020.24610.1043ENGehan Abdel-momemEl-olimybiomaterials-faculty of dentistry-tanta university0000-0002-2892-7663Journal Article20200224Background: It has been observed that preheating dental composites prior to photo-curing improves their handling characteristics and enhances their mechanical properties. <br /> Aim: This study aimed to investigate the effect of three preheating temperatures on hardness, flexural strength and depth of cure of Filtek™ Z250 XT Nano Hybrid and Filtek™ P60 Packable composites. <br /> Materials & Methods: a total of 90 composite specimens were prepared 30 for each temperature and the samples were preheated at 24, 54 and 68 °C. Vickers microhardness, flexure strength/modulus and depth of cure of preheated samples were recorded for both materials. For each test, thirty specimens for each resin composite were prepared and randomly divided in 3 subgroups (10 for each) according to the preheating temperature. Statistical analysis was carried out using One-Way ANOVA.<br /> Results: Increasing the preheating temperature of Filtek™ Z250 XT Nano-hybrid and Filtek™ P60 packable composites significantly increased the Vickers microhardness number, flexure strength and depth of cure. This effect was prominent particularly when the temperature increased from 24 to 54°C. Filtek™ P60 packable composites showed significantly higher Vickers microhardness number, flexure strength/modulus and depth of cure than Filtek™ Z250 XT Nano-hybrid at the tested preheating temperatures.<br /> Conclusion: preheating improved the hardness, flexure properties and depth of cure of tested composites.https://edj.journals.ekb.eg/article_105251_8a272cf0064cdc4d39f1e89fee09dc13.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948466Issue 3 - July (Fixed Prosthodontics, Removable Prosthodontics and Dental Materials)20200701Non-invasive Treatment of Demineralized Enamel by Eggshell Powder, Bioactive Glass, and Casein: Comparative Study1741174810562110.21608/edj.2020.25317.1060ENRamy AbdallahAbdelrahimDental Biomaterials, Faculty of Dentistry, Al-Azhar university, Cairo, EgyptIbrahim EldsokiBashaOperative dentistry, faculty of dentistry, Al-Azhar university, Cairo, EgyptHamed IbrahimElkadiOperative dentistry, faculty of dentistry, Al-Azhar university, Cairo, EgyptJournal Article20200307Introduction: Non-invasive treatment protocol of demineralized enamel lesions as more conservative procedure by different remineralizing agents would bring a major approach in the clinical management of these enamel defects. <br /> Aim: The present study was aimed to investigates in-situ remineralization of the demineralized enamel surface, by treatment with different remineralizing agents and stored in an artificial saliva with neutral pH, at 37 °C for 21 days.<br /> Materials and Method: We investigated the morphology, and chemical composition of the demineralized and remineralized enamel surface, which treated with Chicken Eggshell powder solution (CESPS), Bioactive Glass (BAG), and Casein phosphopeptide-amorphous calcium phosphate (CPP-ACP) as remineralizing agent twice daily and stored in artificial saliva for 21 days. The surface morphology, as well as the chemical composition of the remineralized enamel samples were studied by scanning electron microscopy (SEM) coupled with energy dispersive X-ray (EDX) spectrometry. <br /> Results: <br /> CESPS resulted in the higher and significant remineralization results when comparing with BAG alone or in combination with it as well as it showed significant effect when compared with CPP-ACP.<br /> Conclusion: <br /> CESPS, BAG, and CPP-ACP can use as non-invasive treatment of early carious enamel lesions.https://edj.journals.ekb.eg/article_105621_f5efc68d7f8bd2c5640ef57895c21670.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948466Issue 3 - July (Fixed Prosthodontics, Removable Prosthodontics and Dental Materials)20200701Radiographic evaluation of crystal bone level of immediate loaded implant restored with two different CAD-CAM materials1749175510525410.21608/edj.2020.28485.1112ENNoraSaadBDS, Msc of Prosthodontics, Beirut Arab University. LebanonEssamOsmanProfessor of Dental Biomaterials, Beirut Arab University, Faculty of Dentistry, Beirut Arab University, Lebanon.Ahmed MAbdelhamidProfessor of Removable Prosthodontics Faculty of Dentistry, Alexandria University, Egypt.0000-0002-3200-866XMohamedShokryAss. Professor of oral and maxillofacial surgery, Beirut Arab University, Faculty of Dentistry, Lebanon, and Alexandria University, Egypt0000-0002-7959-8812Ehab A.FarghalyProsthodontics Department, Faculty of Dentistry Beirut Arab University, Beirut, Lebanon0000-0003-2341-6378Journal Article20200422Purpose This study was conducted to radiographically evaluate the effect of two different superstructure CAD/CAM fabricated materials, on crestal bone loss around immediately loaded implant. Materials and Methods A total of twelve healthy patients having mandibular bilateral missing first molars with acceptable bone volume were selected based on specific inclusion and exclusion criteria, each patient received a CAD/CAM monolithic zirconia, in one site, while the other site received a CAD/CAM Enamic superstructure, in 48 hours after implant insertion. Implants and abutments were examined for stability, gingival and periodontal health prior to crown cementation. Radiographic evaluation was done immediately at the time of crown cementation then at 6 and 12 months. Results Marginal bone loss was measured at two points, the most buccal crestal bone, and the most lingual crestal bone. Radiographic results showed no significant difference regarding mean MBL between Zirconia and Enamic on 6 and 12 months. Conclusion Immediate loading of a single mandibular molar implant with the final restoration seem to be a reliable technique when certain parameters are respected. Type of implant superstructure material has no significant influence on the bone supporting the implant within the time period of this study.https://edj.journals.ekb.eg/article_105254_cb4f1ee87ca4083db9720da7b486abfc.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948466Issue 3 - July (Fixed Prosthodontics, Removable Prosthodontics and Dental Materials)20200701Correlation and multiple regression analysis of the central incisors and gingival color relationship.1757176710525510.21608/edj.2020.29503.1122ENMohamed AhmedAlkhodaryAssociate professor, department of prosthodontics, faculty of dentistry, Alexandria university, Egypt.0000-0003-2736-3672Journal Article20200505Introduction<br /> The color of the gingiva was thought to be valuable assist in determining the color of the missing central incisors. The aim of this study was to investigate the correlation between CIE L*a*b* color coordinates of central incisor teeth and attached gingiva.<br /> Materials and methods<br /> Two hundred patients participated in this study, the color coordinates L*a*b* of the central incisors and attached gingiva was determined by the clinical spectrophotometer Shadepilot, Pearson's correlation and multiple regression were used to assess whether one can predict the value of the tooth color coordinates based on the values of gingival color. <br /> Results <br /> The results of current work showed significant correlation of the teeth to gingival color, except for maxillary central incisor a*, and showed that gingival color can be used to predict the color of missing central incisor teeth.<br /> Conclusion <br /> Within the limitation of the study, it was concluded that the significant correlation found between central incisors and gingival color.<br /> Keywords: Attached gingiva color, CIELAB color system, Spectrophotometer, Tooth color.https://edj.journals.ekb.eg/article_105255_39b88c43b86d8a6a14e9bcbb295a805f.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948466Issue 3 - July (Fixed Prosthodontics, Removable Prosthodontics and Dental Materials)20200701Metal versus poly ether-ether Ketone secondary copings for rigid telescopic retained implant supported mandibular over dentures. Evaluation of clinical retention forces1769177810561510.21608/edj.2020.31446.1134ENShahinaz SayedMohamedDepartment of Prosthodontics ,faculty of dentistry, Beni-Suef university, Egypt.0000-0003-4468-5307AmrEmarahDepartment of Removable Prosthodontics, Faculty of Dentistry, Fayoum University, Fayoum, Egypt0009-0008-5856-6505Journal Article20200531Purpose: The aim of this study was to evaluate and compare clinical retention values of metal and poly ether-ether Ketone secondary copings for rigid telescopic retained implant supported mandibular overdentures<br /> Material and methods: Eight edentulous patients (4 males and 4 females) who were unsatisfied with the retention of mandibular dentures were randomly assigned equally into 2 groups then received 4 implants in the interforaminal region of the mandible. Group I received telescopic overdentures with metal secondary coping (control group), Group II received telescopic overdentures with Poly ether-ether secondary copings (PEEK) (test group). Measurement of clinical retention forces (in Newton) were performed by digital force meter device attached to a special device that ensure application of vertical dislodging perpendicular to the patient’s occlusal plan. Measurements were performed at time of overdenture insertion, 3 months and 6 months after insertion. <br /> Results: For all times of measurements, PEEK secondary copings were associated with significant higher clinical retention values than metal secondary copings. For metal and PEEK groups, retention values at base line were the highest values followed by retention values after 3 months and the least retention forces were noted after 6 months.<br /> Conclusion: Within the limitations of this study caused by small patient sample and short evaluation period, PEEK secondary copings for telescopic attachments of mandibular implant overdentures is recommended than cobalt chromium secondary copings as it was associated with increased clinical retention values even after 6 months of clinical use.https://edj.journals.ekb.eg/article_105615_b36d2de3f3dcba2a9ae33dc1c93623aa.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948466Issue 3 - July (Fixed Prosthodontics, Removable Prosthodontics and Dental Materials)20200701Mrginal Accuracy of Hybrid and different Machinable Ceramic Crowns1779178610561610.21608/edj.2020.32610.1147ENWalaa OssamaEl MekkawiCrown&amp;Bridge department
Faculty of dentistry
Al Azhar University(Girl&#039;s Branch)Walaa El MekkawiJournal Article20200617Purpose: The aim of the present study was to evaluate marginal accuracy of hybrid and different ceramic crowns.<br /> Material and Methods: Forty sound human maxillary central incisors were selected and received standardized preparation with shoulder finish line. They were divided into four groups according to the material of construction: Group I: VITA Enamic , Group II: E.max CAD, Group III Celtra-Duo ,Group IV: VIA Suprinity (n=10). The crowns were fabricated from blocks using CAD/CAM system. All crowns were cemented using self adhesive resin cement. Marginal discrepancy (pre and post cementation) was tested for all samples. Data were tabulated and statistically analyzed. The results were collected, arranged and tabulated to be statistically analyzed. Results: The highest mean value of marginal gap was found in E-max cad group, followed by Celtra-Duo group, followed by VITA Suprinity group while the lowest mean value was found in VITA Enamic group. The samples of VITA Enamic showed the lower marginal gap values compared to the other samples either before (29.5 μm ± 1.5) or after cementation 20.97 μm ± 1.45). The samples of E-max cad showed the highest marginal gap values compared to the other samples either before (33.8 μm ± 0.75) or after cementation (30.6 μm ±.0.6). Conclusion: Hybrid ceramics crowns introduced the highest marginal accuracy while E-max cad crowns introduced the lowest marginal accuracy. Zirconia reinforced Lithium silicate restorations, particularly the partially crystalline form, introduced better marginal accuracy than Hybrid ceramics restorations.https://edj.journals.ekb.eg/article_105616_7a53e2647cbd8eaa5ee0028124965cbb.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948466Issue 3 - July (Fixed Prosthodontics, Removable Prosthodontics and Dental Materials)20200701Thermoplastic Mandibular Tooth Supported Overdentures Versus Acrylic One (Maxillary Tissue Changes).1787179510561710.21608/edj.2020.32851.1143ENMohamedAboshamalecturer of removable prosthodontic department. faculty of dental medicine, Al-Azhar university (Assiut), Assiut branch. Egypt20000-0003-2479-2869Asem MohamedKamellecturer of dental medicine department. faculty of dental medicine, Al-Azhar university (Assiut), Assiut branch. Egypt20000-0003-0136-8520Journal Article20200615Objectives: the work was to determine the maxillary tissue changes under acrylic and flexible lower tooth supported overdentures.<br /> Methods: The study was accomplished on 20 patients; the selected cases were upper completely edentulous and lower tooth supported one. lower overdenture supported with canines bilaterally. The cases randomly split into two groups: Group I; ten patients wear acrylic complete upper denture and acrylic mandibular tooth supported overdenture Group II; ten patients wear flexible complete upper denture and flexible lower tooth supported overdenture.<br /> Clinical tests were performed by measuring the soft tissue thickness of superimpose the anterior upper ridge at 2 dots 1 cm and 2 cm on each hand to the midline at time of prosthesis delivery and at 12 months. Also, radiographic evaluations of upper edentulous area estimated at time of prosthesis delivery and at 12 months.<br /> Results: there was non-significant increase in upper mucosa thickness in both groups at both points of measurements. Also, both groups showed radiographic bony changes in maxillary ridge. There was significant increase in maxillary bony changes in Group I in compare to Group II.<br /> Conclusion: it was concluded that there was slight increase in the thickness of soft tissue above the anterior upper ridge in each sequence. More bone resorption allover region of maxilla was observed in Group I, but there was slight decrease in Group II more than Group I.https://edj.journals.ekb.eg/article_105617_0d4debeb230aceb79cd53f80be6d8470.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948466Issue 3 - July (Fixed Prosthodontics, Removable Prosthodontics and Dental Materials)20200701Marginal Bone Loss Around Machined versus Plasma Sprayed Implant Supported Mandibular Overdenture Cases -A Split- Mouth Randomized Controlled Trial.1797180510561810.21608/edj.2020.32941.1144ENMahaKamalLecturer of removable prosthodontic department, faculty of dentistry, British University in Egypt.0000-0001-6489-7302Journal Article20200616Abstract<br /> Aim of this study: To compare marginal bone loss around machined and plasma sprayed dental implant collar surfaces after 24 months follow up period in mandibular overdenture cases. Materials and methods: Eight patients with completely edentulous ridges received 32 implants; each patient received 4 implants at the lower arch; 2 machined collar implants were placed at one side and 2 plasma sprayed collar implants were placed at the other side. The implants were loaded 3 months after placement. Radiographic marginal bone loss was measured using CBCT at time of implant placement (baseline), 3,6,12 and 24 months follow up periods. Result: Marginal bone loss was observed for both machined and plasma sprayed implant collars throughout the follow up periods with statistically significant decrease in bone level through 24 months follow up period. Conclusion: Plasma sprayed implant collar promoted better bone repair with less bone loss than did machined implant collar.https://edj.journals.ekb.eg/article_105618_1d4333d53852ab3bcdb41697b5147615.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948466Issue 3 - July (Fixed Prosthodontics, Removable Prosthodontics and Dental Materials)20200701EVALUATION OF DIFFERENT PROSTHETIC DESIGNS OF IMPLANT ASSISTED REMOVABLE PARTIAL DENTURES USED IN MANDIBULAR KENNEDY CLASS II CASES. A THREE –DIMENSIONAL FINITE- ELEMENT ANALYSIS.1807181610561910.21608/edj.2020.33543.1156ENAhmed BayomiElokl1- Associate Professor of Removable Prosthodontics. Oral and Maxillofacial Prosthodontic. Dep. Faculty of Dentistry, King Abdulaziz University. Jeddah, KSA.
2- Assistant Professor of Removable Prosthodontics Faculty of Dental Medicine,EnasMesallumAssistant Professor of Removable Prosthodontics. Oral and Maxillofacial Prosthodontic. Dep. Faculty of Dentistry, King Abdulaziz University. Jeddah, KSAJournal Article20200623The puroose:The aim of this study was to evaluate the effect of different designs of removable partial denture (RPD) supported with distal implant for the treatment of mandibular Kennedy class II cases on the behavior of oral structures by using Three-dimensional (3D) finite-element analysis (FEA). Materials and methods: A three models of mandibular class II Kennedy arch received three RPD designs were evaluated. The first model involves the use of RPI clasp on the first premolar. The second model involves the use of an extra coronal attachment at the distal aspect of the splinted first bicuspid and canine abutments. The third model received a bilateral (RPD) with RPI clasp on the first premolar and a double Aker clasp on the second premolar and first molar of the opposite side. For all models a single implant was placed at the second molar region with a conventional ball and socket attachment. For each model, a vertical and oblique loads of 100N were applied to the second molar area . The created model components were then imported to FEA software (ANSYS). Results: The first model recorded a significant less stresses at the bone, mucosa and abutment teeth in comparison to the other models but insignificance differences occurred in the total deformations. Conclusion: The von Mises stress and deformation produced in case of model 1 (clasp design) was better than that occurred with the other two models ( bilateral and extracoronal attachments)https://edj.journals.ekb.eg/article_105619_5531b97ceb2dee45bb563e2470d78810.pdfThe Egyptian Dental Association (EDA)Egyptian Dental Journal0070-948466Issue 3 - July (Fixed Prosthodontics, Removable Prosthodontics and Dental Materials)20200701Metal versus Poly ether-ether ketone (PEEK) framework reinforcements for maxillary palateless ball retained implant overdentures. One year clinical and radiographic outcomes1817182810577210.21608/edj.2020.33441.1160ENSahar AhmedKortamRemovable prosthodontics , Faculty of Dentistry , Beni-Suef UniversityJournal Article20200623Objectives: This study aimed to investigate both the clinical and radiographic outcomes of metal and Poly ether-ether ketone (PEEK) framework reinforcement materials for maxillary palateless ball retained implant overdentures after one year follow-up period .<br /> Materials and methods: Eight edentulous patients with edentulous maxillary ridges and implant retained mandibular overdentures who complained from lack of retention of their maxillary dentures were classified into 2 groups; group 1 included 4 patients who received palateless maxillary overdentures with cobalt chromium metal reinforcement, group 2 (included 4 patients who received palateless maxillary overdentures with PEEK reinforcement. All patients received 4 implants in canine and second premolar areas of maxilla. After 6 months, overdentures were attached to the fixtures with O/ring attachments. Clinical outcomes included Plaque indices, bleeding indices, depth of probing and implant mobility) and radiographical evaluation included marginal bone resorption. All outcomes were evaluated at prosthesis delivery, 6 months and one year after prosthesis delivery. <br /> Results: The survival rate of the implants showed significant difference, as it was 83% and 100% for metal and PEEK groups respectively. Plaque and bleeding scores, as well as pocket depth increased significantly from base line to 12 months. Bone resorption progress significantly from 6 months to 12 months in both groups. PEEK group showed significantly lower plaque scores, bleeding scores, probing depth and bone resorption than metal one. No significant differences in mobility of the implants in-between observation times or groups were notedhttps://edj.journals.ekb.eg/article_105772_cda814eee17a1836924c9e713465321c.pdf