CLASS V COMPOSITE PLACEMENT METHODS AND CAVITY DESIGNS

这一试点项目的近期目标是开发工具， 工程分析和复合材料的设计。最终 目标是改进贴装技术和腔体设计， 在保持健康牙齿结构同时增加修复体寿命 和最小化医源性并发症。重点是临床问题 (open边缘、牙齿敏感、复发性龋齿、变色等） 与聚合收缩期间产生的应力相关 复合树脂本研究的方法是分析安置 技术和腔设计与应用国家的最先进的 应力计算工具（有限元法，FEM）。将使用FEM 为了计算在放置自和 光固化V类复合材料。 具体目标如下。必须开发FEM方法， 模拟聚合过程和相关的收缩。的 算法将考虑到关键不同的行为， 自固化与光固化材料。这些模型将用于比较 不同的放置技术产生的应力， 不同的腔设计。然后，放置方法和腔体制备 将研究设计变更以使应力累积最小化。 最后，基于数值开发的信息，实验室测试 将执行以验证FE模型。

The immediate goal of this pilot project is to develop tools for the engineering analysis and design of composite restorations. The ultimate goal is to improve placement techniques and cavity designs in order to increase restoration longevity while conserving healthy tooth structure and minimizing iatrogenic complications. The focus is on clinical problems (open margins, tooth sensitivity, recurrent decay, discoloration, etc.) associated with stresses developed during the polymerization shrinkage of composite resins. The approach in this study is to analyze placement techniques and cavity designs with the application of a state-of-the-art stress calculation tool (Finite Element Method, FEM). The FEM will be used to calculate the stresses developed during the placement of self- and light-cured Class V composite restorations. The specific aims include the following. FEM methods must be developed to model the polymerization process and the associated shrinkage. The algorithm will take into account the crucially dissimilar behaviors of self- vs. light-cure materials. Those models will then be used to compare the stresses that are developed with different placement techniques into different cavity designs. Then, placement methods and cavity preparation design changes will be investigated for minimization of stress build-up. Finally, based on the numerically developed information, laboratory tests will be performed to validate the FE model.