天然牙-游离端种植牙联合支持固定桥的应力分布

目的 :揭示天然牙—种植体联合支持固定桥不同桥长度的设计时应力分布特点 ,为临床优化设计提供实验力学依据。方法 :采用三维有限元的方法研究三种长度桥体的天然牙—游离端种植牙联合支持固定桥的应力分布。结果 :天然牙—种植牙固定桥应力集中于基牙的颈部 ;种植体颈部骨组织的应力大于天然牙颈部骨组织的应力 ;集中垂直载荷时种植体颈部骨的应力分布较均匀 ;集中斜向载荷时种植体的颊舌侧骨组织有明显的应力集中区 ,并且桥体跨度增加 ,种植体周骨的最大应力值增加 ,天然牙周骨的应力值无显著变化。结论 :天然牙—种植体固定桥受集中斜向载荷易导致种植牙周骨损伤 ,尤其桥体长度增加时应减小侧向力并增加基牙数量

The Distribution of stress on the Fixed Bridge with pontics of three kinds of Length supporteb by the combination of Tooth and Fixture

Objective:To study the stress distribution on the fixed bridge of three length of pontic supported by tooth and fixture.Materials and Methods:By the 3 Dimensional Finite Element,the stress distribution on the Fixed Bridge with pontics of three kinds of Length supported by teeth and fixtures was studied.Results:Stress concentrated on the neck area of implant bone interface;Stress on the neck area of implant bone interface was larger than that on the neck area of teeth bone interface.There were obviously stress concentrated area on the neck of implant periodontal bone under the concentrated oblique loading,the longer the length of pontic,the larger the stress enlarged under the concentrated oblique loading.Conclusion:It is possible that the periodontal bone of the implant of the fixed bridge supported by teeth implant under the concentrated loading;the oblique force on the bridge should be reduced.