对采用MODP预备和CAD/CAM陶瓷修复体的牙髓治疗上颌前磨牙失败风险的评估。
Estimation of the risk of failure for an endodontically treated maxillary premolar with MODP preparation and CAD/CAM ceramic restorations.
作者信息
Lin Chun-Li, Chang Yen-Hsiang, Pa Che-An
机构信息
Department of Mechanical Engineering, Chang Gung University, Tao-yuan, Taiwan.
出版信息
J Endod. 2009 Oct;35(10):1391-5. doi: 10.1016/j.joen.2009.06.020. Epub 2009 Aug 15.
INTRODUCTION
This study evaluated the risk of failure for an endodontically treated premolar with mesio occlusodistal palatal (MODP) preparation and 3 different computer-aided design/computer-aided manufacturing (CAD/CAM) ceramic restoration configurations.
METHODS
Three 3-dimensional finite element (FE) models designed with CAD/CAM ceramic onlay, endocrown, and conventional crown restorations were constructed to perform simulations. The Weibull function was incorporated with FE analysis to calculate the long-term failure probability relative to different load conditions.
RESULTS
The results indicated that the stress values on the enamel, dentin, and luting cement for endocrown restoration were the lowest values relative to the other 2 restorations. Weibull analysis revealed that the individual failure probability in the endocrown enamel, dentin, and luting cement obviously diminished more than those for onlay and conventional crown restorations. The overall failure probabilities were 27.5%, 1%, and 1% for onlay, endocrown, and conventional crown restorations, respectively, in normal occlusal condition.
CONCLUSIONS
This numeric investigation suggests that endocrown and conventional crown restorations for endodontically treated premolars with MODP preparation present similar longevity.
引言
本研究评估了采用近中（牙合）远中腭侧（MODP）预备的根管治疗前磨牙及3种不同的计算机辅助设计/计算机辅助制造（CAD/CAM）陶瓷修复体构型的失败风险。
方法
构建了3个采用CAD/CAM陶瓷高嵌体、髓腔固位冠和传统全冠修复设计的三维有限元（FE）模型，以进行模拟。将威布尔函数与有限元分析相结合，以计算相对于不同负荷条件的长期失败概率。
结果
结果表明，相对于其他2种修复体，髓腔固位冠修复体在釉质、牙本质和粘结水门汀上的应力值为最低值。威布尔分析显示，髓腔固位冠的釉质、牙本质和粘结水门汀的个体失败概率明显比高嵌体和传统全冠修复体降低得更多。在正常咬合条件下，高嵌体、髓腔固位冠和传统全冠修复体的总体失败概率分别为27.5%、1%和1%。
结论
这项数值研究表明，采用MODP预备的根管治疗前磨牙的髓腔固位冠和传统全冠修复体具有相似的使用寿命。
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