Finite element and Weibull analyses to estimate failure risks in the ceramic endocrown and classical crown for endodontically treated maxillary premolar
Finite element and Weibull analyses to estimate failure risks in the ceramic endocrown and classical crown for endodontically treated maxillary premolar
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DOI：
10.1111/j.1600-0722.2009.00704.x
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发表时间：
2010-02-01
影响因子：
1.9
通讯作者：
Huang, Shao-Fu
中科院分区：
文献类型：
--
作者：
Lin, Chun-Li;Chang, Yen-Hsiang;Huang, Shao-Fu
本研究评估了一个根管治疗前磨牙的失败风险与严重损坏的冠状硬组织，并恢复与计算机辅助设计/计算机辅助制造（CAD/CAM）陶瓷内冠或经典冠配置。两个，三维有限元上颌前磨牙模型设计与根管治疗，并恢复无论是椅旁经济重建美学陶瓷（CEREC）陶瓷内冠或经典冠。将威布尔函数与有限元分析相结合，计算不同载荷条件下的长期失效概率。此外，在体外疲劳载荷断裂实验进行验证的数值模拟结果。结果表明，根管冠修复体的牙本质和粘接剂的应力值低于冠修复体。威布尔分析显示，个别失败的概率降低在冠内牙本质和粘接水泥比冠修复。虽然冠内修复体和传统冠的总体失效概率相似，但疲劳断裂测试显示，冠内修复体的抗断裂性高于传统冠配置（1，446与1，163 MPa）。这项调查表明，内冠可以被认为是一个保守的，美学的，临床上可行的修复方法，牙髓治疗上颌前磨牙。
The present study evaluated the failure risks of an endodontically treated premolar with severely damaged coronal hard tissue and restored with either a computer-aided design/computer-aided manufacturing (CAD/CAM) ceramic endocrown or a classical crown configuration. Two, three-dimensional finite element maxillary premolar models were designed with endodontic treatment and restored with either a chairside economic reconstruction of esthetic ceramic (CEREC) ceramic endocrown or a classical crown. The Weibull function was incorporated with finite element analysis to calculate the long-term failure probability relative to different load conditions. Additionally, an in vitro fatigue-load fracture experiment was performed to validate the numerical simulation results. The results indicated that the stress values on the dentin and luting cement for the endocrown restoration were lower than those for the crown configuration. Weibull analysis revealed that the individual failure probability in the endocrown dentin and luting cement diminished more than those for the crown restoration. While the overall failure probabilities for the endocrown and the classical crown were similar, fatigue fracture testing revealed that the endocrown restoration had higher fracture resistance than the classical crown configuration (1,446 vs. 1,163 MPa). This investigation implies that the endocrown can be considered as a conservative, aesthetic, and clinically feasible restorative approach for endodontically treated maxillary premolars.