All-on-4种植体参数对周围骨应力影响的三维有限元分析

A three-dimensional finite element analysis of stress distribution in peri-implant bone with All-on-4 implant with various parameters

目的:运用三维有限元法探讨All-on-4远中种植体倾斜角度及悬臂梁长度变化对植体周围骨组织应力的影响。方法:对无牙颌下颌骨标本进行CT扫描,应用Mimcs、Geomagic、Unigraphics、HyperMesh等建模软件建立4个远中种植体不同倾斜角度对应不同悬臂长度的All-on-4种植体有限元模型。150 N垂直静载荷施于右侧悬臂梁末端,用Abaqus软件分析种植体周围骨组织应力。结果:远中种植体倾斜0°悬臂长度为19.5 mm,近、远中种植体周围皮质骨应力峰值分别为25.526MPa和83.026 MPa。当远中种植体分别倾斜15°、30°、45°时,悬臂长度相应减小为17.2、13.3、9.8 mm,与倾斜0°模型相比,种植体远中周围皮质骨应力分别减少12.4%、35.6%、53.1%,种植体近中周围皮质骨应力分别减少13.6%、36.3%、40.2%。结论:从应力分析角度看,All-on-4远中种植体倾斜角度大悬臂梁短的设计优于倾斜角度小悬臂梁长的设计。

Objective：To investigate the stress distribution in peri-implant bone with All-on-4 implant with various parameters by three-dimensional finite element method.Methods：An edentulous mandibular specimen was scanned by CT Mimcs.Geomagic,Uni-graphics,HyperMesh modeling software were used to establish All-on-4 implant finite element models with different inclination angles and corresponding cantilever lengths.1 50 N vertical static load was applied at the right end of the cantilever,peri-implant bone stress was analysed using Abaqus software.Results：When the distal implant inclined 0°with cantilever length of 1 9.5 mm,the peak stress in peri-implant cortical bone at the mesial and distal side was 25.526 MPa and 83.026 MPa respectively.When the distal implant in-clined 1 5°,30°and 45°with the cantilever length of 1 7.2 mm,1 3.3 mm and 9.8 mm,the stress in perio-implant cortical bone at distal side of the implant reduced by 1 2.4%,35.6% and 53.1 %,that at mesial side of the implant reduced by 1 3.6%,36.3% and 40.2%,respectively.Conclusion：From the perspective of the stress analysis,the design of All-on-4 distal implant with large incli-nation angle and short cantilever is superior to that with small inclination angle and long cantilever.