下颌4枚与6枚种植体全口固定义齿的有限元分析  

Stress distribution of two kinds of fixed prosthese supported by four or six dental implants in edentulous mandible

作　　者：游素兰[1] 黄远亮[1] 孙旻[2] 徐伟[2] 

机构地区：[1]同济大学附属东方医院口腔科,上海200120 [2]同济大学土木工程学院,上海200092

出　　处：《上海口腔医学》2009年第6期567-571,共5页Shanghai Journal of Stomatology

基　　金：上海市卫生局青年医学基金资助课题(054Y35);浦东新区卫生系统医学领先人才培养项目(PWRq2007-04)~~

摘　　要：目的:采用有限元分析法,比较4枚和6枚种植体支持下颌固定全口义齿的骨及种植体应力分布特点,为临床种植修复提供生物力学参考依据。方法:建立4枚种植体6mm悬臂和6枚种植体6mm悬臂的2组下颌种植支持式固定全口义齿的三维有限元模型,在悬臂末端垂直加载100N,应用Ansys软件进行分析处理,得到2组设计的种植体,测定最大压应力和最大拉应力。结果:2组设计的骨应力都集中在离受载区最近的2枚种植体颈部骨皮质区。6个种植体组骨应力较小,种植体应力集中在末端和中间种植体的颈部,修复支架应力集中在与远中末端种植体相连接处。2组的种植体应力和种植上部结构应力相近。结论:末端种植体骨应力集中,易发生松动失败;种植体颈部应力集中,易发生植入体与基桩连接失败。2组设计都符合生物力学分布原理。但4种植体设计骨应力较高,适用于前牙区骨质量较好的病例。PURPOSE：To investigate the stress distribution of 2 kinds of distal cantilevered fixed prostheses supported by 4 or 6 dental implants in edentulous mandible with three-dimensional finite element method.METHODS：The first design was 4 implants supported fixed prostheses with 6mm distal cantilever;the second design was 6 implants supported fixed prostheses with 6mm distal cantilever.Vertical force of 100 N was applied to the distal cantilever of fixed prostheses.RESULTS：The bone stress was concentrated at the cortex of mandible.The maximum bone stress was at the cortex near the second implants from the point that the vertical force was applied.The maximum implant stress was at the terminal and medium implant-prostheses interface.CONCLUSIONS：The bone around the terminal implant is easily to absorb and the terminal and medium implants are easily to fracture.The maximum stress of the implants and prostheses of two kinds of design are almost same（239Mpa）.Two kinds of design can be applied in the clinic.6 mm distal cantilevered fixed prostheses supported by 6 implants have the less bone stress than 4 mm distal cantilevered fixed prostheses in edentulous mandible.

关 键 词：固定修复 牙种植 应力 有限元分析 

分 类 号：R783.6[医药卫生—口腔医学]