Influence of connector design on fracture probability of ceramic fixed-partial dentures
Influence of connector design on fracture probability of ceramic fixed-partial dentures
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DOI：
10.1177/154405910208100909
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发表时间：
2002-09-01
影响因子：
7.6
通讯作者：
Anusavice, KJ
中科院分区：
文献类型：
--
作者：
Oh, W;Götzen, N;Anusavice, KJ
陶瓷固定义齿(FPD)由于应力集中，容易在连接体区发生折断。本研究的目的是验证这样一种假设，即FPD连接件的牙龈膜处的曲率半径显著影响三单元FPD的抗折性。代表两个FPD连接器设计的两个三维有限元模型(FEM)以与先前的实验研究(哦，2002)中描述的方式相对应的方式被创建。我们进行了断口分析和基于CARES(NASA)后处理软件的有限元分析，以确定裂纹的起裂位置，并预测特征强度、峰值应力集中位置和断裂风险强度。试验测得的破坏载荷与有限元模拟分析预测的破坏载荷有很好的相关性。断口照片显示在牙周膜处有骨折起始，这证实了数值预测的骨折起始位置。在所测试的设计中，牙周膜的曲率半径强烈影响FPD的抗折性。
Fracture of ceramic fixed-partial dentures (FPDs) tends to occur in the connector area because of stress concentrations. The objective of this study was to test the hypothesis that the radius of curvature at the gingival embrasure of the FPD connector significantly affects the fracture resistance of three-unit FPDs. Two three-dimensional finite element models (FEMs), representing two FPD connector designs, were created in a manner corresponding to that described in a previous experimental study (Oh, 2002). We performed fractographic analysis and FEM analyses based on CARES (NASA) post-processing software to determine the crack initiation site as well as to predict the characteristic strength, the location of peak stress concentrations, and the risk-of-rupture intensities. A good correlation was found between the experimentally measured failure loads and those predicted by FEM simulation analyses. Fractography revealed fracture initiation at the gingival embrasure, which confirms the numerically predicted fracture initiation site. For the designs tested, the radius of curvature at the gingival embrasure strongly affects the fracture resistance of FPDs.