动态载荷下双种植体单冠修复下颌磨牙的三维有限元分析

Three-dimensional finite element analysis of double-implant-supported mandibular molar restoration under dynamic loads

目的探讨动态载荷作用条件下,双种植体单冠修复下颌磨牙的最佳聚合角度。方法分别建立聚合角度为0°、5°、10°、15°双种植体单冠修复下颌磨牙的三维有限元模型,对修复体施加一个周期为0.875 s的动态载荷,分析种植体周围骨组织的应力分布和种植体-基台复合体位移值情况。结果①种植体周围皮质骨最大Von-Mises应力值:5°聚合角度模型>10°聚合角度模型>15°聚合角度模型>0°聚合角度模型;种植体周围松质骨最大Von-Mises应力值:15°聚合角度模型>10°聚合角度模型>5°聚合角度模型>0°聚合角度模型;②种植体-基台复合体最大位移峰值:15°聚合角度模型>5°聚合角度模型>10°聚合角度模型>0°聚合角度模型。结论动态载荷下,双种植体单冠修复下颌磨牙的最佳聚合角度为0°。

Objective To discuss the most suitable polymerization angle of double-implant-supported mandibular molar restoration under dynamic loads. Methods Three-dimensional finite element models of mandibular molars with double angles of 0°, 5°, 10° and 15° were established, and a dynamic load of 0.875 s was applied to the restoration. The stress distributions of the bone tissue and the displacement values of the implant-abutment complex were analyzed. Results ①The maximum Von-Mises of cortical bone around the implant:5° polymerization angle model >10° polymerization angle model >15° polymerization angle model >0° polymerization angle model. The maximum Von-Mises of cancellous bone around the implant:15° polymerization angle model >10° polymerization angle model >5° polymerization angle model >0° polymerization angle model. ②The maximum displacement of the implant-abutment complex:15° polymerization angle model >5° polymerization angle model >10° polymerization angle model >0° polymerization angle model. Conclusion The most suitable polymerization angle of double-implant-supported mandibular molar restoration is 0° under dynamic loads.