目的探讨种植体螺纹底部形态对骨界面应力分布的影响,为种植体的设计与临床选择提供生物力学的依据。方法采用三维有限元分析法对螺纹底部形态分别为凹面和平面的种植体在受水平向、垂直向力时骨界面应力分布进行分析讨论。结果在水平和垂直向加载条件下,螺纹底部形态为凹面的种植体骨界面应力小于底部形态为平面者,应力分布趋于均匀。结论螺纹底部形态为凹面的种植体应力分布更加均匀合理,可做为临床设计和选择种植体的参考。 Objective To investigate the influence of implant bottom shape on the stress distribution in bone interface and to provide biomechanics basis for the design and clinical choice of implants. Methods Three-dimensional finite element analysis was used to analyze and discuss the stress distribution on the interface of bone with concave and flat implants with horizontal and vertical downward force. Results Under horizontal and vertical loading conditions, the stress at the implant bone interface with concave bottom was less than that at the bottom, and the stress distribution tended to be uniform. Conclusion The stress distribution at the bottom of thread with concave shape is more uniform and reasonable, which can be used as a reference for clinical design and choice of implants.