种植体数目和倾斜角度对种植固定修复下颌牙列缺失应力分布的影响  

Effect of the number and inclination of implant on stress distribution for mandibular full-arch fixed prosthesis

作　　者：郑晓莹[1] 李笑梅[1] 唐震[1] 龚璐璐[2] 汪大林[1] 

机构地区：[1]第二军医大学附属长海医院口腔科,上海200433 [2]同济大学生命科学与技术学院

出　　处：《中华口腔医学杂志》2014年第6期339-342,共4页Chinese Journal of Stomatology

基　　金：国家自然科学基金（81170987）;上海市科学技术委员会科研计划（12ZR1438400）

摘　　要：目的 探讨种植固定修复下颌牙列缺失时种植体数目及倾斜角度对应力分布的影响.方法 在下颌牙列缺失模型上制作下颌半口义齿,CT扫描获得数据后建立3种三维有限元模型.模型1为（542｜245）植入6枚平行的种植体;模型2为（52｜25）植入4枚平行的种植体;模型3为（52｜25）植入4枚种植体,（2｜2）的2枚种植体相互平行,（5｜5）的2枚种植体向远中倾斜30°.分别垂直加载240 N的力于3种模型（7｜）中央窝,分析各模型种植体、骨种植体界面及义齿支架的受力情况.结果 3种模型（2｜）与（5｜）种植体、骨种植体界面的最大应力大小均为模型3＜模型1＜模型2.模型2的（2｜）和（5｜）种植体、骨种植体界面最大应力为126.8、267.4和40.0 MPa,比模型1（分别为93.4、257.7和37.1MPa）分别增加35.8％、3.8％和7.8％.模型3的（2｜）和（5｜）种植体、骨种植体界面最大应力为82.0、239.5和28.7 MPa,比模型2分别减少35.4％、10.5％和28.2％.结论 本项实验条件下,当种植体平行排列时,增加种植体数目可减小（5｜）种植体和骨种植体界面应力.而采用4枚种植体行固定修复时,改变（5｜5）种植体倾斜角度,可降低种植体及骨种植体界面的应力,获得比6枚种植体更好的效果.Objective To study the effect of implant number and inclination on stress distribution in implant and its surrounding bone with three-dimensional finite element analysis.Methods A special denture was made for an edentulous mandible cast to collect three-dimensional finite element data.Three threedimensional finite element models were established as follows.Model 1∶6 paralleled implants; model 2∶4 paralleled implants; model 3∶4 implants,the two anterior implants were parallel,the two distal implants were tilted 30° distally.Results Among the three models,the maximum stress values found in anterior implants,posterior implants,and peri-implant bone were modle 3 ＜ modle 1 ＜ modle 2 in turn.The effect of implant numbers on stress distribution was as follow：the maximum stress value of the anterior and posterior implant,and the peri-implant bone of model 2 were 126.8,267.4,and 40.0 MPa,which was 35.8％,3.8％ and 7.8％ higher than those in model 1 （93.4,257.7,37.1 MPa） respectively.The impact of implant inclination on stress distribution was as follow：when the distal implant titled 30° in model 3,the maximum stress value of the anterior and posterior implant,and the peri-implant bone were 82.0,239.5 and 28.7 MPa,which was 35.4％,10.5％ and 28.2％ lower than those in model 2 respectively.Conclusions Within the limitation of this study,when implants are placed parallel,the maximum stress of the distal implant can be reduced by increasing the number of implant.When the number of implant was decreased from six to four,the maximum stress around the implant can be reduced by tilting the distal implant.This design will provide a better prostheses effect than the design with six implants does.

关 键 词：牙种植 有限元分析 颌 无牙 

分 类 号：R783.6[医药卫生—口腔医学]