Objective To explore the appropriate area of cross section areas of attachment body in the fixed bridge supported by implant in restoring mandibular single side distal free-end edentulism for enuring that the porcelain layer is not broken. Methods Base on a three-dimensional finite element model of the fixed bridge supported by implant in restoring mandibular single side distal free-end edentulism and according to designed three different cross section areas of attachment body.we construct model l-l,l-ll,l-lll and model ll-l,ll-ll,ll-lll. Results In model I and in modedl-II,the maximum deflection of attactment body are 0.00106,0.000938,0.000563,0.00118,0.000958 and 0.000785. Conclusion In the second premolar to second molar and first premolar to second molar missing.the cross section areas of the attachment body should be more than or equal to 4mm2 and 8mm2,and strains are less than or equal to 0.1%,to ensure that the porcelain layer is not broken.%目的:探寻下颌后牙游离端缺失种植固定桥连接体横截面适宜受力面积,以保证瓷层不发生断裂.方法:在建立下颌单侧后牙游离端缺失种植固定桥三维有限元模型的基础上,建立不同桥体跨度不同连接体面积时的模型I-I、I-II、I-III和II-I、II-II、II-III,利用有限元分析软件ABAQUS找出连接体变形量小于0.001mm时连接体横截面积.结果:在模型I中和模型II中,连接体的最大变形量分别为0.00106、0.000938、0.000563、0.00118、0.000958和0.000785.结论:在第二前磨牙至第二磨牙缺失和第一前磨牙至第二磨牙缺失时,连接体横截面积分别大于或等于4mm2和8mm2时连接变形率小于0.1%,可确保瓷层不发生断裂.
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