van der Varst P G, Lemmens P L, Peters M C, Plasschaert A J
Dept. of Cariology and Endodontology, TRIKON, Nijmegen, The Netherlands.
J Biomech. 1991;24(5):341-7. doi: 10.1016/0021-9290(91)90352-n.
To assess the clinical performance of restorative materials with respect to mechanical failure, the shape of the restoration, the strength and fatigue properties and the loading history are important. This study deals with the feasibility of a method to estimate the mechanical lifetime of dental restorations. The method takes into account that the mechanical lifetime is a stochastic quantity determined by shape, strength and fatigue properties and by the cyclic nature of the mastication forces. The general outline of the method is described and the necessary experimental data are discussed. Preliminary estimates of the lifetime of a composite and an amalgam restoration are made. The method is found to be feasible and the estimated lifetimes of the restoration are of the same order of magnitude as found clinically.
为评估修复材料在机械失效、修复体形状、强度和疲劳性能以及加载历史方面的临床性能，这些因素很重要。本研究探讨了一种估计牙科修复体机械寿命方法的可行性。该方法考虑到机械寿命是一个由形状、强度和疲劳性能以及咀嚼力的循环性质所决定的随机量。描述了该方法的总体概述并讨论了必要的实验数据。对复合树脂和银汞合金修复体的寿命进行了初步估计。结果发现该方法是可行的，并且修复体的估计寿命与临床发现的寿命处于同一数量级。
