Three-dimensional finite analysis in relationship between peri-implantitis and implant shape
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摘要: 目的 探讨种植体周围炎与种植体形态的关系。 方法 建立种植体与天然牙的三维有限元模型,并施加垂直、水平及倾斜45°共3种方向的100 N力量,采用ANSYS workbench软件获取种植体及不同天然牙的三维有限元分析结果。 结果 在分别承受100 N的垂直方向、水平方向的力量时,种植体对骨松质所产生的最大应力均大于天然牙,而种植体本身的最大应力值也远大于天然牙。当种植体承受来自斜45°方向的100 N力量时,周围组织产生的最大应力值介于垂直方向与水平方向之间,而对种植体本身产生的应力为3个方向中最大的。 结论 单纯从形态角度而言,螺纹种植体在承受各个方向的力量时,其对骨松质造成损害的可能性均大于天然牙,因此种植体比天然牙更容易引起种植体周围炎,最终导致种植失败。Abstract: Objective To explore relationship between peri-implantitis and implant shape. Methods Three-dimensional finite element models of the implant and natural teeth were constructed, applying instantaneous force for 100 N in three directions including vertical, horizontal and oblique directions at 45°. The results of three-dimensional finite element analysis of implant and natural teeth were obtained by ANSYS workbench software. Results After bearing force for 100 N from vertical and horizontal directions, the maximum stress value that the implant applied to cancellous bone was much more than natural teeth, and was much more in the implant itself than the natural teeth. When bearing 100 N force from oblique direction at 45°, the maximum stress value produced by surrounding issue was between maximum stress value of vertical direction and horizontal direction, and it was the maximum value of implant in three directions. Conclusion In the perspective of shape, the thread-shaped implant is more likely to cause injury for cancellous bone than natural teeth when bearing the force from different directions. Therefore, the implant may easily lead to peri-implantitis than natural teeth, and cause failure of implantation.
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Keywords:
- implant /
- peri-implantitis /
- finite element analysis /
- maximum stress value /
- natural teeth
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