种植体上部不同结构对下颌游离端义齿应力分布的影响  

Influence of different structures upon implants on the stress distribution of mandibular free-end removable partial denture

作　　者：陈少武[1] 肖微[2] 李智勇[2] 吴敏[1] 王家伟[2] 

机构地区：[1]南方医科大学附属深圳市妇幼保健院口腔科,518028 [2]武汉大学口腔医学院修复科

出　　处：《实用口腔医学杂志》2012年第3期294-297,共4页Journal of Practical Stomatology

基　　金：“十一五”国家科技支撑计划重点基金资助项目(编号:2007BAI18B05);2010年度深圳市科技计划项目(医疗卫生类)(编号:20103100)

摘　　要：目的:观察不同上部结构的种植体支持可摘局部义齿修复下颌KennedyⅠ类牙列缺损时的应力和位移。方法:使用软件GeoStar(COSMOSM 2.85,SRAC,USA)建立4个种植体-天然牙联合可摘义齿修复下颌KennedyⅠ类牙列缺损的三维有限元模型,比较不同上部结构时种植体周围骨组织、基牙牙周膜、基托下黏膜的最大等效应力及基托下黏膜组织的位移变化。结果:有种植体支持时,单冠形式的种植体周围骨组织最大等效应力最大;缓冲型套筒冠的基牙牙周膜最大等效应力、基托下黏膜最大等效应力和位移值最大;微型太极扣种植体周围骨组织最大等效应力、基牙牙周膜最大等效应力和黏膜的最大等效应力及位移值均最小。缓冲型套筒冠种植体周围骨组织最大等效应力小于非缓冲型套筒冠,但基牙牙周膜最大等效应力、基托下黏膜最大等效应力和位移则大于非缓冲型。结论:选用种植体-天然牙联合支持修复远中游离端牙列缺损时,种植体上部结构采用微型太极扣作为附着体联接形式是最佳选择。Objective： To study the influence of different structures upon implants of tooth-implant-removable partial denture support on the stress distribution in periodental tissues and on the displacement at different location.Methods： 4 three-dimensional finite element models of implant-tooth-supporting Kennedy Class Ⅰ removable partial denture were created.Effects of different structures upon implants（ITI Straumann and NOBEL ReplaceTM Tapered）were evaluated under vertical loading.The variation of displacement of periodontium under saddle and the stress in the bone around implants,in periodontal membrane of abutments and in residual ridge were analysed.Results： The lowest values of stress and displacement for all the structures was found when micro-ERA attachment was used.Conclusion： Micro-ERA attachment may be the appropriate choice for tooth-implant supported removable partial denture.

关 键 词：种植体 可摘局部义齿 三维有限元 附着体 

分 类 号：R783.6[医药卫生—口腔医学]