Lin Chun-Li, Chang Shih-Hao, Chang Wen-Jen, Kuo Yu-Chan
Department of Mechanical Engineering, Chang Gung University, Tao-Yuan, Taiwan.
Eur J Oral Sci. 2007 Oct;115(5):408-16. doi: 10.1111/j.1600-0722.2007.00473.x.
The aim of this study was to determine the relative contribution of changes (design factors) in implant system, position, bone classification, and loading condition on the biomechanical response of a single-unit implant-supported restoration. Non-linear finite-element analysis was used to simulate the mechanical responses in an implant placed in the maxillary posterior region. The Taguchi method was employed to identify the significance of each design factor in controlling the strain/stress. Increased strain values were noted in the cortical bone with lateral force and an implant with a retaining-screw connection. Cancellous bone strain was affected primarily by bone type and increased with decreasing bone density. Implant stress was influenced mainly by implant type and position. The combined use of finite-element analysis and the Taguchi method facilitated effective evaluation of the mechanical characteristics of a single-unit implant-supported restoration. Implants placed along the axis of loading exhibit improved stress/strain distribution. The reduction of lateral stress through implant placement and selective occlusal adjustment is recommended. An implant with a tapered interference fit connection performed better as a force-transmission mechanism than other configurations.
本研究的目的是确定种植体系统、位置、骨分类和加载条件的变化（设计因素）对单颗种植体支持修复体生物力学响应的相对贡献。采用非线性有限元分析来模拟上颌后牙区种植体的力学响应。运用田口方法来确定每个设计因素在控制应变/应力方面的重要性。在皮质骨中，侧向力作用下以及采用固位螺钉连接的种植体的应变值会增加。松质骨应变主要受骨类型影响，并随骨密度降低而增加。种植体应力主要受种植体类型和位置影响。有限元分析和田口方法的联合使用有助于有效评估单颗种植体支持修复体的力学特性。沿加载轴放置的种植体具有更好的应力/应变分布。建议通过种植体位置调整和选择性咬合调整来降低侧向应力。作为一种力传递机制，具有锥形干涉配合连接的种植体比其他结构表现更好。
