螺纹与约束高度影响种植体应力分布的三维有限元分析

目的：研究螺纹与约束高度对于种植体应力分布的影响。方法：利用实体建模技术建立种植体的仿真模型，通过三维有限元的分析方法，对4种模型进行Von Mises应力分析。结果：长种植体约束高度高；在约束高度降低时，种植体应力明显增大，而不带螺纹的种植体应力变化较带螺纹的种植体小；螺纹间距对于应力值及应力分布无显著影响。结论：带螺纹的种植体强度要求高；长种植体的应力分布均匀，应力值小，对提高种植体的成功率有意义。

The Influence of the Screw Thread and the Height of Constraints on the Stress Distribution around Dental Implants by Using Three-Dimensional Finite Element Analysis

Objective To study the influence of the screw thread and the height of constraints on the stress distribution of the implants. Method The three-dimensional emulational models of the implants with different screw-pitch were constructed by a CAD/CAM package. The Von Mises stress of the models was analyzed by three-dimensional finite element method. Results The constraints of the long implant were high. When the constraint height reduced, the change of the stress value of the implants without screw thread was much less than that of the implants with screw thread. The difference of screw-pitch had little influence on the stress value and the stress concentration of the implants. Conclusions The strength requirement of screw implant was high. Stress distribution of the long dental implants was more reasonable than the other, which will contribute to the success of dental implants.