支抗种植体外形影响骨界面应力分布的研究

目的探讨种植体外形差异对骨界面应力分布的影响,并筛选出最佳支抗种植体外形。方法应用三维有限元分析方法对刃状螺纹型、矩形螺纹型及光滑型种植体进行骨界面应力和位移分析。结果刃状螺纹型种植体做支抗体时其骨界面第一、第二及第三主应力分别为6.67MPa、1.47MPa及0.52MPa,并且VonMises应力为7.22MPa,在三种种植体中应力值最小。而3种种植体颈部牙槽骨的DMX位移值分别为0.11×10

The effects of implantmorphology on stress distribution in implant-bone interface

Objective:To investigate the effects of different shapes of implant on stress distribution in implant-bone interface and to select the most appropriate shape for orthodontic anchorage. Method:3-dimesional finite element analysis method was used to analyze the stress and strain in implant-bone interface of knife-edged threaded, square threaded and smooth type implants.Results: The first,second and third main stress (MPa) of knife-edged threaded implant were 6.67, 1.47 and 0.52 respectively with 7.72 MPa of Von Mises stress;those of square threaded 13.00,2.51,0.57 and 11.8;smooth type 10.50,2.50,0.67 and 12.60,respectively. The variables of alveolar bone at the cervix of knife-edged threaded,square threaded and smooth type implants were (0.11×10-3), （0.13×10-3） and （0.94×10-4) mm respectively. Conclusion: The stress in knife-edged threaded implant-bone interface and alveolar bone deformation at the cervix of the implants is minimal,therefore the implants are more suitable for orthodontic anchorage.