Objective

To characterize the biomechanical performance of fiber-reinforced composite 5-unit implant-supported fixed dental prostheses (FDPs) receiving individually milled crowns by insilico and fatigue analyses.

Methods

Eighteen implant-supported five-unit fiber-reinforced composite frameworks with an individually prepared abutment design were fabricated, and ninety resin-matrix ceramic crowns were milled to fit each abutment. FDPs were subjected to step-stress accelerated-life testing with load delivered at the center of the pontic and at 2nd molar and 1st premolar until failure. The reliability of the prostheses combining all loaded data and of each loaded tooth was estimated for a mission of 50,000 cycles at 300, 600 and 900 N. Weibull parameters were calculated and plotted. Fractographic and finite element analysis were performed.

Results

Fatigue analysis demonstrated high probability of survival at 300 N, with no significant differences when the set load was increased to 600 and 900 N. 1st and 2nd molar dataset showed high reliability at 300 N, which remained high for the higher load missions; whereas 1st premolar dataset showed a significant decrease when the reliability at 300 N was compared to higher load missions. The characteristic-strength of the combined dataset was 1252 N, with 1st molar dataset presenting higher values relative to 2nd molar and 1st premolar, both significantly different. Failure modes comprised chiefly cohesive fracture within the crown material originated from cracks at the occlusal area, matching the maximum principal strain location.

Significance

Five-unit implant-supported FDP with crowns individually cemented in a fiber-reinforced composite framework presented a high survival probability. Crown fracture comprised the main failure mode.

中文翻译：

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粘合在纤维增强复合材料框架 5 单元种植体支持修复体上的牙冠性能：计算机模拟和疲劳分析

客观的

通过insilico和疲劳分析来表征纤维增强复合材料 5 单元种植体支持的固定义齿 (FDP) 的生物力学性能，该义齿接受单独铣削的牙冠。

方法

制作了 18 个种植体支持的五单元纤维增强复合材料框架，具有单独准备的基台设计，并铣削了 90 个树脂基陶瓷冠以适合每个基台。FDP 经受阶梯应力加速寿命测试，负载在桥体中心和第二磨牙和第一前磨牙传递，直至失效。在 300、600 和 900 N 的 50,000 次循环任务中，估计了结合所有负载数据和每个负载牙齿的修复体的可靠性。计算并绘制了 Weibull 参数。进行了断口和有限元分析。

结果

疲劳分析表明在 300 N 下存活的概率很高，当设定载荷增加到 600 和 900 N 时没有显着差异。第 1 和第 2 摩尔数据集在 300 N 时显示出高可靠性，对于更高载荷的任务仍然很高；而当 300 N 的可靠性与更高负载的任务相比时，第一个前磨牙数据集显示出显着下降。组合数据集的特征强度为 1252 N，第一磨牙数据集相对于第二磨牙和第一前磨牙呈现更高的值，两者有显着差异。失效模式主要包括牙冠材料内的内聚性断裂，这些断裂源于咬合区域的裂纹，与最大主应变位置相匹配。

意义

五单元种植体支持的 FDP 与牙冠单独粘合在纤维增强复合材料框架中，具有很高的存活概率。冠部骨折是主要的失效模式。