Al-Azhar Journal of Dental Science最新文献_第2页

Fracture resistance of CAD CAM endocrowns bonded to teeth with different number of remaining walls :An In-Vitro Study. 不同剩余牙壁数的CAD - CAM内冠与牙体的抗断裂性能研究。

Al-Azhar Journal of Dental Science Pub Date : 2023-07-01 DOI: 10.21608/ajdsm.2023.199146.1426

A. Elbieh, Mohamed Sherbaty, M. Zayed, Hatem H. A. Ibrahim, Mohammed Desokey

{"title":"Fracture resistance of CAD CAM endocrowns bonded to teeth with different number of remaining walls :An In-Vitro Study.","authors":"A. Elbieh, Mohamed Sherbaty, M. Zayed, Hatem H. A. Ibrahim, Mohammed Desokey","doi":"10.21608/ajdsm.2023.199146.1426","DOIUrl":"https://doi.org/10.21608/ajdsm.2023.199146.1426","url":null,"abstract":"Objective: Currently, there is no recommendation for the minimum number of remaining walls for Zirconia endocrown. Materials and methods: Fifty resin specimens were divided into 5 main groups according to the remaining wall number; group W0 no remaining walls, group W1 1 remaining wall, group W2 2 remaining walls, group W3 3 remaining walls, group W4 no missing walls. Ten resin dies for each group were fabricated using epoxy resin and assigned to each group. Resin dies from all groups were individually scanned using an extraoral scanner. Second generation zirconia monolithic (three mol% yttria-stabilized tetragonal zirconia polycrystal (3Y-TZP) endocrowns were milled. All endocrowns were sintered according to the manufacturer’s recommendations. After trial fitting, all endocrowns were cemented to their corresponding resin dies using resin cement. After 1000 thermal cycles alternating between hot and cold baths with 20-second immersions at 55±1º C and 5±1ºC, respectively, and a 10-second delay between each immersion, each specimen was fixed to the lower fixed part of a universal testing machine with a load cell of 5 kN at a crosshead speed of 0.5 mm/min. All specimens were loaded to failure, and recorded in Newton using computer software. Data were collected, tabulated and statistically analyzed. Results: Group W1 showed higher mean values (2933±733.61) followed by W0 group (2453.5±492.48), then W4 group (2187±576) and group W2 (2108.17±451.28) and finally W3 group (1992±205.63). At a 95% of confidence level, One-Way ANOVA revealed significant differences between tested groups (P= 0.033). Conclusions: There was a significant difference in fracture resistance between groups with different numbers of remaining walls. The mean fracture resistance values were not consistent with the number of remaining walls. The number of remaining walls is not directly proportional to the fracture resistance values.","PeriodicalId":117944,"journal":{"name":"Al-Azhar Journal of Dental Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114863740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Clinical and Radiographic Evaluation of 2.25% Sodium hypochlorite gel and Brix 3000 in caries removing of deciduous teeth. 2.25%次氯酸钠凝胶与Brix 3000在乳牙除龋中的临床及影像学评价。

Al-Azhar Journal of Dental Science Pub Date : 2023-07-01 DOI: 10.21608/ajdsm.2022.143548.1342

Ahmed Elwazeer, A. Abdallah, A. Abbas

{"title":"Clinical and Radiographic Evaluation of 2.25% Sodium hypochlorite gel and Brix 3000 in caries removing of deciduous teeth.","authors":"Ahmed Elwazeer, A. Abdallah, A. Abbas","doi":"10.21608/ajdsm.2022.143548.1342","DOIUrl":"https://doi.org/10.21608/ajdsm.2022.143548.1342","url":null,"abstract":"Objective: Evaluation the efficacy of 2.25% sodium hypochlorite gel and Brix 3000 in caries removal of deciduous teeth. Subjects and methods: Thirty-six primary molars (class 1) with depth of caries not more than the coronal two thirds of dentine thickness. The children were aged 4-7 years and randomly divided into three equal groups based on the method of caries removal. The time of caries removal in each tooth was calculated using a stopwatch and the mean time of each method was obtained. The physical pain was also assessed by asking the children to choose the face that express their feeling using the Wong-Baker FACES analysis scale. The children were recalled for clinical and radiographic evaluation after 1and 6 months. Results: The conventional method showed the shortest time (2.82±0.477 min.) of caries removal followed by Brix 3000 (5.47±1.35min.) and 2.25% sodium hypochlorite gel (7.24±1.45 min.). Concerning pain sensation; the conventional method showed the highest grade of pain sensation with high significant differences from the two other chemomechanical methods. The results showed no significant difference between 2.25% sodium hypochlorite gel and Brix 3000. The clinical and radiographic evaluation showed that there was no significant difference after 1 and 6 months between all groups. The success rate among these groups showed that there was no significant difference between the success rates in all groups. Conclusion: 2.25% sodium hypochlorite gel and Brix 3000 are effective chemomechanical caries removing agents.","PeriodicalId":117944,"journal":{"name":"Al-Azhar Journal of Dental Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134317994","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

3D Finite Elements Analysis of Stress Distribution on the Posterior Tilted Implants on all on 4 Concept 后倾种植体应力分布的三维有限元分析

Al-Azhar Journal of Dental Science Pub Date : 2023-07-01 DOI: 10.21608/ajdsm.2021.80868.1205

M. Shalaby, Hafez Bahnassawi, Y. Baraka

{"title":"3D Finite Elements Analysis of Stress Distribution on the Posterior Tilted Implants on all on 4 Concept","authors":"M. Shalaby, Hafez Bahnassawi, Y. Baraka","doi":"10.21608/ajdsm.2021.80868.1205","DOIUrl":"https://doi.org/10.21608/ajdsm.2021.80868.1205","url":null,"abstract":"Objective: The purpose of this study was to evaluate the stress distribution of fixed implant-supported prostheses using “all-on-four” concept for the treatment of mandibular completely edentulous ridge “in vitro study” by 3D finite elements analysis . Materials and Methods: The finite element model components as the overdenture, mucosa, implants, angled base, abutment, cortical and cancellous bones were created in “Autodesk Inventor, then exported as SAT files. These components were assembled in ANSYS environment. The model was subjected to two loading conditions of 200N, vertically unilateral and, vertically bilateral at molar regions respectively. Results: All values of deformations and stresses appeared on the model components (overdenture, implants, angled base, abutment, cortical and cancellous bones) were within physiological limits under all loads application. Conclusion: Tilted implants at molar area did not affect the system behavior (did not show peak of stresses or deformation) and all values of deformations and stresses that appeared on the model parts (cortical, spongy bone, implant, base, abutment, and overdenture) were within physiological limits under all cases of load application.","PeriodicalId":117944,"journal":{"name":"Al-Azhar Journal of Dental Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123837673","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Modulus of Elasticity of Different Resin Denture Base Materials: A Comparative Study 不同树脂义齿基托材料弹性模量的比较研究

Al-Azhar Journal of Dental Science Pub Date : 2023-07-01 DOI: 10.21608/ajdsm.2021.78808.1204

A. Sherif, Mohamed Helal, Y. Baraka

{"title":"Modulus of Elasticity of Different Resin Denture Base Materials: A Comparative Study","authors":"A. Sherif, Mohamed Helal, Y. Baraka","doi":"10.21608/ajdsm.2021.78808.1204","DOIUrl":"https://doi.org/10.21608/ajdsm.2021.78808.1204","url":null,"abstract":"Objective: The objective of this in vitro study was to compare modulus of elasticity of CAD /CAM milled, 3D printed and flexible pressed resins. Materials and Methods: eighteen rectangular specimens with specific measurement (65mm X 10mm X 3 mm) were constructed from different resin denture base materials and divided into 3 groups (6 specimens for each group). Group I contained the CAD/CAM milled resin specimens, Group II contained 3D printed specimens and Group III contained polyamide flexible resin. The specimens were evaluated by the three-point bending test on universal testing machine (INSTRON) to calculated modulus of elasticity. Data was analyzed with ANOVA and Tukey’s pair-wise post-hoc tests. Results: The modulus of elasticity values of all groups ranged from 845.5 MPa to 2962.3 MPa. There were significant differences among the tested resin denture base materials. CAD/CAM milled materials had the highest modulus of elasticity, while the polyamide pressed materials had the lowest. The 3D-printed acrylics materials had lower modulus of elasticity values than CAD/CAM milled materials. Conclusion: The CAD/CAM milled and 3D printed denture base resins showed higher modulus of elasticity when evaluated with polyamide pressed materials.","PeriodicalId":117944,"journal":{"name":"Al-Azhar Journal of Dental Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117140038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of Diode Laser and Warm Air Drying on the Shear Bond Strength of Lithium Di-silicate to Dentin. An In-vitro Study 二极管激光和热风干燥对二硅酸锂与牙本质剪切结合强度的影响。体外研究

Al-Azhar Journal of Dental Science Pub Date : 2023-07-01 DOI: 10.21608/ajdsm.2021.95336.1242

Mohamed Riad, H. Othman, Hussein Mohamed

{"title":"Effect of Diode Laser and Warm Air Drying on the Shear Bond Strength of Lithium Di-silicate to Dentin. An In-vitro Study","authors":"Mohamed Riad, H. Othman, Hussein Mohamed","doi":"10.21608/ajdsm.2021.95336.1242","DOIUrl":"https://doi.org/10.21608/ajdsm.2021.95336.1242","url":null,"abstract":"Objective: This study aimed to assess the effect of diode laser irradiation (980 nm) and warm air drying (50°C) on shear bond strength between Lithium di-silicate and human dentin using both Etch & Rinse (ER) adhesive, Adper Single Bond 2 and Self-etch (SE) adhesive, Single Bond Universal before adhesive polymerization. Materials and methods: One hundred and eight sound lower molars were sectioned perpendicular to the long axis to obtain flat dentinal surfaces. Specimens were divided into 2 equal groups (n=54): Group 1 (ER) and Group 2 (SE) according to bonding approach. Each group was subdivided according to dentin moisture elimination technique into 3 equal subgroups (n=18): Control (Co), Diode laser irradiation (L) and Warm air drying (W). All specimens were adhesively cemented to IPS e.max® CAD discs using RelyX™ Ultimate Clicker™ (3M ESPE) resin cement. Half of the samples were then subjected to pre-loading in a thermodynamic manner (C=9). Afterwards, all samples were tested for shear bond strength using computer-controlled material testing machine. Results: Data analysis was performed using three-way (ANOVA) (p< 0.05) followed by pair-wise Tukey’s post-hoc tests. Three-way ANOVA showed significant difference between moisture elimination techniques in both groups, except ERNC. Also, for both groups, subgroup (W) had the highest shear bond strength values followed by (Co) subgroup and the least was (L) subgroup. Conclusion: Warm air drying for both bonding approaches increased shear bond strength of IPS e.max to human dentin and can be introduced to enhance bonding to dentin.","PeriodicalId":117944,"journal":{"name":"Al-Azhar Journal of Dental Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127883841","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Wear and Surface Roughness of 3D Printed and Milled CAD-CAM Restorative Materials 3D打印和铣削CAD-CAM修复材料的磨损和表面粗糙度

Al-Azhar Journal of Dental Science Pub Date : 2023-04-01 DOI: 10.21608/ajdsm.2023.186911.1406

Ahmed Arafa, L. Ghanem

引用次数: 0

Gingival recession in North Sinai governorate: Incidence, Severity, Distribution and Risk indicators 北西奈省牙龈萎缩:发病率、严重程度、分布和风险指标

Al-Azhar Journal of Dental Science Pub Date : 2023-04-01 DOI: 10.21608/ajdsm.2021.92174.1230

A. Ayoub, Abdel-Fattah Amer, M. Assadawy

引用次数: 0

The effect of two different types of attachments in implant-retained complete mandibular thermoplastic overdenture on biting force 两种不同类型附着体对下颌热塑性覆盖义齿咬合力的影响

Al-Azhar Journal of Dental Science Pub Date : 2023-04-01 DOI: 10.21608/ajdsm.2021.69408.1193

farid hamam, Mostafa Y. Farahat, O. Baraka

引用次数: 0

Some Properties of Glass-Ionomer Cements Prepared by Sol-Gel Method and Incorporated with Nano-Fluorapatite 溶胶-凝胶法制备与纳米氟磷灰石掺入的玻璃离子聚合物水泥的一些性能

Al-Azhar Journal of Dental Science Pub Date : 2023-04-01 DOI: 10.21608/ajdsm.2022.116374.1288

Ahmed Ezzeldine, Mohamed Hassan, M. Ali, A. Shaaban

引用次数: 0

Clinical And Radiographic Outcomes Following Lateral Alveolar Ridge Augmentation Using Autogenous Dentin Block Graft- A clinical study 自体牙本质块移植侧牙槽嵴增强的临床和影像学结果-一项临床研究

Al-Azhar Journal of Dental Science Pub Date : 2023-04-01 DOI: 10.21608/ajdsm.2023.128113.1325

belal shehab, K. Ali, A. Hassaneen

引用次数: 0