三种载荷条件下种植体骨界面应力分布特征

目的 探讨种植体在垂直,斜向,水平方向3种加载条件下种植体周围界面应力的分布。方法 应用牙CT扫描图像建立三维有限元种植体模型,在种植体模型上进行垂直方向加载35N,水平方向加载10N,斜向加载70N,计算种植体周围骨界面最大应力及综合应力。结果 3种加载条件下应力集中部位出现在种植体颈部,水平加功及斜向加载比垂直向加载更容易产生颈部的应力集中。结论 在临床设计种植方案归特别要注意容易产生斜向及水平咀嚼压力的种植部位的设计,不仅要考虑咀嚼压力的大小,还要考虑咀嚼压力的方向。

Characteristics of Stress Distribution on Bone Adjacent to Implants Under Three Different Loading Directions

Objective o evaluate the stress distribution on bone adjacent to an implant under the vertical load,oblique load and horizontal load.Methods Obtained three dimensional radiographic data of the jaw by dental CT scan.Based on the scanning sections,the three-dimensional finite element analysis mandible model was established.Loading vertical,oblique and horizontal forces on the implant,caculated the maximum stress,minimum stress and von mises stress.Results The peak stress occurred at the cervical bone margin adjacent to the implants;the stress concentration under the vertical loading is easily concentrated than that of vertical loading.Conclusion In the clinical designation,not only the force of bite but also the direction of the force should both be emphasised.