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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。
Pub Date : 2023-07-01 DOI: 10.21608/ajdsm.2023.199146.1426
A. Elbieh, Mohamed Sherbaty, M. Zayed, Hatem H. A. Ibrahim, Mohammed Desokey
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.
目的:目前,对于氧化锆内冠的最小剩余壁数尚无建议。材料与方法:50个树脂标本按剩余壁数分为5组;W0组无残壁,w11组无残壁,W2组无残壁,W3组无残壁,W4组无残壁。每组用环氧树脂制作10个树脂模具,并分配给每组。所有组的树脂模具分别使用口外扫描仪进行扫描。制备了第二代氧化锆单片(3mol %钇稳定的四方氧化锆多晶(3Y-TZP)内冠。所有内冠均按照制造商的建议进行烧结。试合完成后,将所有的内冠用树脂胶结剂粘接到相应的树脂模具上。在55±1ºC和5±1ºC条件下分别浸泡20秒的冷热交替1000次,每次浸泡间隔10秒后,以0.5 mm/min的十字速度将每个试样固定在5 kN称重传感器的万能试验机的下固定部分。所有的标本都加载到失效状态,并使用计算机软件在Newton中进行记录。收集数据,制表并进行统计分析。结果:W1组平均值较高(2933±733.61),其次为W0组(2453.5±492.48),其次为W4组(2187±576),W2组(2108.17±451.28),最后为W3组(1992±205.63)。在95%的置信水平上,单因素方差分析显示各组之间存在显著差异(P= 0.033)。结论:不同残壁数组间的抗骨折能力有显著差异。平均断裂阻力值与剩余壁数不一致。剩余壁的数量与断裂阻力值不成正比。
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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。
Pub Date : 2023-07-01 DOI: 10.21608/ajdsm.2022.143548.1342
Ahmed Elwazeer, A. Abdallah, A. Abbas
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.
目的:评价2.25%次氯酸钠凝胶与Brix 3000在乳牙除龋中的疗效。研究对象和方法:36颗初生磨牙(1类),龋深不超过牙本质厚度的冠状三分之二。4 ~ 7岁儿童按除龋方法随机分为3组。用秒表计算每颗牙的除龋时间,得到各方法的平均时间。通过使用Wong-Baker FACES分析量表,要求孩子们选择表达他们感觉的脸来评估身体疼痛。患儿在1个月和6个月后被召回进行临床和影像学评估。结果:常规方法除龋时间最短(2.82±0.477 min),其次为Brix 3000(5.47±1.35min)和2.25%次氯酸钠凝胶(7.24±1.45 min)。关于痛觉的;常规方法的疼痛感觉等级最高,与其他两种化学力学方法差异显著。结果表明,2.25%次氯酸钠凝胶与Brix 3000无显著差异。临床和影像学评价显示,1个月和6个月后各组间无显著差异。各组间成功率比较,各组间成功率差异无统计学意义。结论:2.25%次氯酸钠凝胶和Brix 3000是有效的化学机械除龋剂。
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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
Pub Date : 2023-07-01 DOI: 10.21608/ajdsm.2021.80868.1205
M. Shalaby, Hafez Bahnassawi, Y. Baraka
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.
目的:通过三维有限元分析,评价采用“全上四”概念治疗下颌全无牙嵴“体外研究”的固定种植体支持修复体的应力分布。材料和方法:在Autodesk Inventor中创建覆盖义齿、粘膜、种植体、角度基托、基牙、皮质骨和松质骨等有限元模型部件,并导出为SAT文件。在ANSYS环境下对这些部件进行了装配。模型在磨牙区分别承受垂直单侧和垂直双侧两种200N的载荷。结果:模型构件(覆盖义齿、种植体、斜基、基牙、皮质骨和松质骨)在各种载荷作用下的变形和应力值均在生理范围内。结论:磨牙区种植体倾斜不影响系统行为(未出现应力或变形峰值),在所有载荷作用下,模型部位(皮质骨、海绵骨、种植体、基牙、基牙、覆盖义齿)的变形和应力值均在生理范围内。
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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
Pub Date : 2023-07-01 DOI: 10.21608/ajdsm.2021.78808.1204
A. Sherif, Mohamed Helal, Y. Baraka
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.
目的:比较CAD /CAM铣削、3D打印和柔性压制树脂的弹性模量。材料与方法:采用不同的树脂义齿基托材料制作尺寸为65mm X 10mm X 3mm的长方形标本18个,分为3组(每组6个)。第一组为CAD/CAM铣削树脂试件,第二组为3D打印试件,第三组为聚酰胺柔性树脂试件。在万能试验机(INSTRON)上进行三点弯曲试验,计算试件的弹性模量。数据分析采用方差分析和Tukey’s成对事后检验。结果:各组的弹性模量在845.5 MPa ~ 2962.3 MPa之间。不同树脂义齿基托材料间存在显著性差异。CAD/CAM铣削材料的弹性模量最高,聚酰胺压制材料的弹性模量最低。3d打印丙烯酸材料的弹性模量低于CAD/CAM铣削材料。结论:CAD/CAM研磨和3D打印的义齿基托树脂与聚酰胺压制材料相比具有更高的弹性模量。
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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
Pub Date : 2023-07-01 DOI: 10.21608/ajdsm.2021.95336.1242
Mohamed Riad, H. Othman, Hussein Mohamed
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.
目的:在胶粘剂聚合前,采用蚀刻与冲洗(ER)胶粘剂Adper Single bond 2和自蚀刻(SE)胶粘剂Single bond Universal,研究激光辐照(980 nm)和热风干燥(50℃)对二硅酸锂与人牙本质剪切结合强度的影响。材料和方法:将108颗健康的下磨牙垂直于长轴切面,获得平整的牙釉质表面。按粘接方式将标本分为2组(n=54): 1组(ER)和2组(SE)。根据牙本质祛湿技术将各组再分为3组(n=18):对照组(Co)、二极管激光照射组(L)和热风干燥组(W)。所有标本均使用RelyX™Ultimate Clicker™(3M ESPE)树脂胶粘剂与IPS e.max®CAD椎间盘进行粘接。然后,一半的样品以热力学方式进行预加载(C=9)。然后,使用计算机控制的材料试验机对所有样品进行剪切粘结强度测试。结果:采用三向方差分析(ANOVA) (p< 0.05)进行数据分析,然后进行双配对的Tukey事后检验。三因素方差分析显示,除ERNC外,两组的除湿技术存在显著差异。两组剪切强度值均以W亚组最高,Co亚组次之,L亚组最低。结论:两种粘结方式的热风干燥均可提高IPS e.max与人牙本质的剪切粘结强度,可用于增强与牙本质的粘结。
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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
Pub Date : 2023-04-01 DOI: 10.21608/ajdsm.2023.186911.1406
Ahmed Arafa, L. Ghanem
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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
Pub Date : 2023-04-01 DOI: 10.21608/ajdsm.2021.92174.1230
A. Ayoub, Abdel-Fattah Amer, M. Assadawy
{"title":"Gingival recession in North Sinai governorate: Incidence, Severity, Distribution and Risk indicators","authors":"A. Ayoub, Abdel-Fattah Amer, M. Assadawy","doi":"10.21608/ajdsm.2021.92174.1230","DOIUrl":"https://doi.org/10.21608/ajdsm.2021.92174.1230","url":null,"abstract":"","PeriodicalId":117944,"journal":{"name":"Al-Azhar Journal of Dental Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127977416","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
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
Pub Date : 2023-04-01 DOI: 10.21608/ajdsm.2021.69408.1193
farid hamam, Mostafa Y. Farahat, O. Baraka
{"title":"The effect of two different types of attachments in implant-retained complete mandibular thermoplastic overdenture on biting force","authors":"farid hamam, Mostafa Y. Farahat, O. Baraka","doi":"10.21608/ajdsm.2021.69408.1193","DOIUrl":"https://doi.org/10.21608/ajdsm.2021.69408.1193","url":null,"abstract":"","PeriodicalId":117944,"journal":{"name":"Al-Azhar Journal of Dental Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113983514","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
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
Pub Date : 2023-04-01 DOI: 10.21608/ajdsm.2022.116374.1288
Ahmed Ezzeldine, Mohamed Hassan, M. Ali, A. Shaaban
{"title":"Some Properties of Glass-Ionomer Cements Prepared by Sol-Gel Method and Incorporated with Nano-Fluorapatite","authors":"Ahmed Ezzeldine, Mohamed Hassan, M. Ali, A. Shaaban","doi":"10.21608/ajdsm.2022.116374.1288","DOIUrl":"https://doi.org/10.21608/ajdsm.2022.116374.1288","url":null,"abstract":"","PeriodicalId":117944,"journal":{"name":"Al-Azhar Journal of Dental Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116698745","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 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
Pub Date : 2023-04-01 DOI: 10.21608/ajdsm.2023.128113.1325
belal shehab, K. Ali, A. Hassaneen
{"title":"Clinical And Radiographic Outcomes Following Lateral Alveolar Ridge Augmentation Using Autogenous Dentin Block Graft- A clinical study","authors":"belal shehab, K. Ali, A. Hassaneen","doi":"10.21608/ajdsm.2023.128113.1325","DOIUrl":"https://doi.org/10.21608/ajdsm.2023.128113.1325","url":null,"abstract":"","PeriodicalId":117944,"journal":{"name":"Al-Azhar Journal of Dental Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130694350","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
期刊
Al-Azhar Journal of Dental Science
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