平台转换种植体周围应力分布的三维有限元分析

目的:分析平台转换种植体周围的力学分布特点。方法:利用CATIA画图软件,建立种植体支持的上颌第一前磨牙三维模型,分析垂直向和斜向加载条件下平齐对接(PM)和平台转换(PS)种植体周围的应力分布差异;比较不同材料基台平台转换冠修复后种植体周围的应力分布差异。结果:①PS型种植体在垂直加载和斜向加载时种植体周围骨组织内最大von Mises应力值均较PM型小。②不同材料基台种植体周围应力分布云图相似,应力均集中在种植体颈部。结论:①PS种植体周围骨组织最大应力值较PM种植体小,但基台、中央螺丝、种植体的应力增大。②斜向加载较垂直向加载种植体周围应力值大大增加,特别是基台及种植体部位较为明显。③基台材料对种植体周围应力值无明显影响。

Stress distribution around platform-switching implants studied by Three-dimensional finite element analysis

Objective： To understand the bone＇s stress distribution around the platform-switching implant, provide the basis for the clinical choose. Method： Use CATIA professional drawing software, build implant-supported three-dimensional model of maxillary first premolar, analysising the stress distribution around implant between platform-matching （PM） and platform-switching （PS） in the vertical and oblique loading conditions, the maximum stress distribution with different materials abutment in the platform-swtiching conditions around the implants. Result： （1）in the PS model, the maximum von Mises stress vertical in the vertical loading is smaller than in the oblique loading. （2）The stress distribution around the implants, with different material abutment, is similar, and concentrated in the cortical bone implant neck. Conclusion： （1）Platformswitching peri-implant bone tissue stresses decreases compare to the platform matching, but the abutment, the central screw, the implant stress increases. （2） stress various parts around the implants increased significantly in the oblique load conditions, particularly the abutment and peri-implant are obvious. （3） the stress distribution was less affected by the material of the abutment.