【摘要】 目的 :分析磨牙游离缺失单端固定桥修复的受力情况。方法 :运用三维有限元应力分析法 ,对一侧磨牙游离缺失通过改变牙槽骨支持高度 ,采用不同基牙数目 ,不同桥体长度建立不同的单端固定桥有限元模型进行应力和位移的计算和分析。结果 :较高的应力集中在游离端近中的基牙上 ,牙槽骨高度降低会增加基牙的移位及应力集中 ;单纯增加基牙的数目不会导致牙周组织中应力明显相应减少 ;基牙数目增加会减少修复体移位及应力集中 ;增加桥体长度会引起义齿应力明显增加和向远中移位。结论 :游离缺失端行单端固定桥修复最好选择桥体为一个磨牙长度 ,且基牙数至少两个 ,以提高单端固定桥修复的成功率。更多还原

【Abstract】 Objective:To analyze the stress state of a cantilevered fixed particle dentures. Methods:three-dimensional finite methods was used to analyze the stresses of a posterior cantilevered fixed partial denture by altering the splinted abutments and the length of the Pontic in the peridontitium with normal and reduced bone support, to analyze and calculate the stress and displacement. Result:High stress concentration lied around the abutment closet the cantilever. Reduced bone support increased the deflection and stress concentration. When teeth were splinted together, displacement and stress concentration was reduced. That the number of splinted abutments were increased didn’t result in a proportional reduction of stress in the periodontium, long cantilevered Pontic obviously increased the stress and the deflection of a cantilevered fixed partial denture. Conclude:It is better to select one molar Pontic and at least two abutments for a successful posterior cantilevered fixed partial denture.更多还原