Shi Li, Li Haiyan, Fok Alex S L, Ucer Cemal, Devlin Hugh, Horner Keith
School of Mechanical, Aerospace and Civil Engineering, The University of Manchester, UK.
Int J Oral Maxillofac Implants. 2007 Nov-Dec;22(6):911-20.
The purpose of this study was to derive alternative implant shapes which could minimize the stress concentration at the shoulder level of the implant.
A topological shape optimization technique (soft kill option), which mimics biological growth, was used in conjunction with the finite element (FE) method to optimize the shape of a dental implant under loads. Shape optimization of the implant was carried out using a 2-dimensional (2D) FE model of the mandible. Three-dimensional (3D) FE analyses were then performed to verify the reduction of peak stresses in the optimized design.
Some of the designs formulated using optimization resembled the shape of a natural tooth. Guided by the results of the optimization, alternative implant designs with a taper and a larger crestal radius at the shoulder were derived. Subsequent FE analyses indicated that the peak stresses of these optimized implants under both axial and oblique loads were significantly lower than those observed around a model of commercially available dental implant.
The new implant shapes obtained using FE-based shape optimization techniques can potentially increase the success of dental implants due to the reduced stress concentration at the bone-implant interface.
本研究的目的是推导可使种植体肩部应力集中最小化的替代种植体形状。
一种模拟生物生长的拓扑形状优化技术（软杀选项）与有限元（FE）方法结合使用，以在负载下优化牙种植体的形状。使用下颌骨的二维（2D）有限元模型对种植体进行形状优化。然后进行三维（3D）有限元分析，以验证优化设计中峰值应力的降低。
使用优化制定的一些设计类似于天然牙齿的形状。在优化结果的指导下，得出了在肩部具有锥度和更大嵴顶半径的替代种植体设计。随后的有限元分析表明，这些优化种植体在轴向和斜向负载下的峰值应力明显低于在市售牙种植体模型周围观察到的应力。
使用基于有限元的形状优化技术获得的新种植体形状可能会提高牙种植体的成功率，因为骨-种植体界面处的应力集中降低了。
