Screw Retained Implant Supported Zirconia Anterior Fixed Dental Prosthesis with Different Abutment Angulations: Evaluation of Fracture Resistance and Failure Modes

M. Mohamed, W. Al-Zordk, Nesma M. El-Gohary, M. Ghazy
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Abstract

: Objective: To evaluate the effect of different implant-abutment angulations on the fracture resistance of anterior three-unit implant-supported zirconia fixed dental prosthesis. Materials and Methods: Five groups (n=10) were fabricated to represent maxillary anterior three-unit zirconia fixed dental prosthesis supported by two implants with different implant-abutment angulations including group 0 o -0 o , group 0 o -17.5 o , group 0 o -35 o , group 17.5 o -17.5 o and group 35 o -35 o . Zirconia FDPs were cemented by self-adhesive resin cement. All specimens were subjected to thermocycling (5000 X 5 o C/55 o C) and mechanical loading (50 N X 120,000 cycles /1.6Hz). Static loading was applied using the universal testing machine at a crosshead speed of 1 mm/min. One-way ANOVA and Post hoc Tukey test were applied and statistical significance was set at P value < 0.05. Results : All specimens subjected to TCML survived without mechanical failure. Group 0°-35°, group 17.5°-17.5° and group 35°-35° (654.24 ± 81.66 N; 551.34 ± 87.79 N; 382.42 ± 52.07 N, respectively) showed a significant decrease in fracture resistance compared to that in group 0°-0° which showed the highest fracture resistance (759.72 ± 88.33 N) (P=0.04, <0.001, <0.001 respectively). There was no significant difference between group 0°-17.5° (746.04 ± 85.02 N) (P=0.99) compared to that in group 0°-0°. Conclusions: The fracture resistance of zirconia FDPs decreased as implant-abutment angulation increased. Angled abutments of 0 o , 17.5 o , and 35 o could be used
不同基牙角度的螺钉保留种植体支撑氧化锆前牙固定修复体:抗骨折及失效模式的评估
目的:探讨不同种植-基牙角度对前牙三单元种植氧化锆固定义齿抗骨折性的影响。材料与方法:制作5组(n=10),分别为0 ~ 0 0组、0 ~ 17.5 0组、0 ~ 35 0组、17.5 0 ~ 17.5 0组和35 0 ~ 35 0 0组,分别代表两种种植体、不同种植基牙角度的上颌前牙三单元氧化锆固定义齿。采用自粘树脂水泥对氧化锆FDPs进行胶结。所有的样品都进行了热循环(5000 X 5 o C/55 o C)和机械加载(50 N X 120,000 cycles /1.6Hz)。采用万能试验机,以1 mm/min的十字速度进行静态加载。采用单因素方差分析和事后Tukey检验,P值< 0.05,差异有统计学意义。结果:所有经TCML处理的标本均存活,无机械故障。0°-35°组、17.5°-17.5°组和35°-35°组(654.24±81.66 N;551.34±87.79 n;(382.42±52.07 N),与骨折阻力最高的0°-0°组(759.72±88.33 N)相比,骨折阻力明显降低(P=0.04, <0.001, <0.001)。0°-17.5°组(746.04±85.02 N)与0°-0°组比较差异无统计学意义(P=0.99)。结论:氧化锆FDPs的抗骨折性随种植基牙角度的增加而降低。可采用0度、17.5度、35度角的支台
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