氧化锆全瓷角度基台的三维有限元应力分析

目的:观察基台倾斜角度对氧化锆全瓷基台及种植体周围骨组织内部应力分布的影响。方法:利用COS-MOS2.85软件包建立14个种植体支持的上颌中切牙三维有限元模型,基台分别设计为与种植体长轴呈0°、5°、10°、15°、20°、25°和30°的氧化锆全瓷基台和钛基台,用178N的与种植体成130°的斜向加载,比较不同模型中基台内部和种植体周围骨组织内应力分布情况。结果:不同倾斜角度时氧化锆全瓷基台和钛基台内应力集中区不同,前者集中在唇侧肩台和唇侧轴壁中上部,钛基台应力集中区为唇侧肩台处。随倾斜角度的增加,基台和种植体周围骨组织内最大Von Mises应力增加,钛基台增加速度相对平稳,而瓷基台的增加速度在倾斜角度大于15°后明显加剧。和钛基台相比,在相同倾斜角度时,瓷基台内应力值较高而骨组织内应力值较低。结论:随着基台倾斜角度的增加,氧化锆全瓷基台和骨组织内应力增加;氧化锆全瓷角度基台的倾斜角度不宜超过15°。

Finite Element Analysis of Zirconia Angled Ceramic Abutment.

Objective:To observe the influence of abutment angulation on the stress distribution within zirconia angled ceramic abutment and peri-implant bone.Methods: 14 three-dimensional finite element models of implant-supported maxillary incisor with angled abutments were established by COSMOS 2.85.Abutment was made by zirconia and titanium with an angle of 0 degree,5 degrees,10 degrees,15 degrees,20 degrees,25 degrees and 30 degrees co-related with the long axis of the implant,respectively.A load of 178 N and 130 degrees to the long axis of the implant was applied.Stresses within abutment and peri-implant bone were compared.Results: The stress distribution within zirconia and titanium angled abutment was different.Within zirconia abutment,stress concentrated in the shoulder and middle part of buccal side,while within titanium abutment only in the shoulder of buccal side.The maximum Von Mises stress within abutment and bone increased as the abutment angulation increased.The increasing speed was relatively stable within titanium abutment but obviously became faster within zirconia abutment when abutment angulaion was over 15 degrees.For the same abutment angulation,zirconia abutment demonstrated higher stress within abutment and lower stress within peri-implant bone.Conclusion: Stresses within zirconia angled ceramic abutment and peri-implant bone increased as the abutment angulation increased;over 15 degrees abutment angulation was not suggested for zirconia ceramic abutment.