种植体长度与直径对骨界面应力分布影响的三维有限元分析  

Three-dimension finite element analysis of the influence of implant diameter and length on the stress distribution at bone interface

作　　者：赵宝红[1] 张娇[1] 蔺增[2] 赵吉奎 封伟[1] 江鹭鹭[1] 邓春富[1] 尚德浩[1] 张翀[1] 王丹宁[1] 

机构地区：[1]中国医科大学附属口腔医院种植中心,辽宁沈阳110002 [2]东北大学真空与流体工程中心,辽宁沈阳110004

出　　处：《口腔医学》2014年第1期22-27,共6页Stomatology

基　　金：沈阳市科技计划项目基金(F11-264-1-25);沈阳市科技计划项目基金(F12-277-1-18);辽宁省自然科学基金(20092093);辽宁省科技计划项目基金(2012225090)

摘　　要：目的比较不同直径、长度的种植体对种植体-骨界面应力分布的影响。方法按照种植体不同长度与直径,建立种植义齿的三维有限元模型。以美国31种植体系统为参考,在Solidworks三维制图软件中绘制包含种植体、相应基台及牙冠的三维实体模型。种植体长度分别设为8、10、12、14 mm,直径分别设为3.5、4.0、4.5、5.0 mm,通过不同长度与直径交叉组合,共得到16种模型。对每个模型进行垂直向及斜向加载负荷,运用Ansys Workbench 13.0分析比较各模型受力后应力分布情况。结果两种载荷下应力集中出现在种植体颈部皮质骨区和根尖松质骨区,随着种植体长度增加,根尖松质骨区应力集中缓慢下降;随着种植体直径的增大,根尖松质骨区应力集中明显减小。结论在种植体长度与直径的选择中,直径与长度越大,种植体-骨界面的应力集中越小,但与长度相比,直径的影响更加显著。Objective To compare the influence of implants with different diameters and lengths on the stress distribution of implant - bone interface. Methods According to the different lengths and diameters of the implant,fully three-dimensional finite element mod el was established. The 3 I implant system used as reference,3D entity model including the implant,corresponding abutment and dental crowns was drawn with Solidworks 3D cartography software. The group for size analysis consisted of 16 implant models with the cross combination of the different lengths which were set to 8 ram, 10 mm, 12 mm, 14 mm and the different diameters set to 3.5,4.0,3.5,5. 0 ram. Take vertical and oblique loading on each model,and compare Von Mises stress distribution and the trend of stress changes of each model with Ansys Workbench 13.0. Results Under each loading,the Von Mises stress of implant-bone interface in all models concentrated in the cortical bone around the neck of implant and cancellous bone area of the root tip. With the increase of implant length,stress concentration in the cancellous hone area of the root tip slowly declined with the increase of the diameter,the stress con- centration decreased significantly. Conclusions Both diameter and length have an influence on the stress concentration of implant - bone interface. The longer the diameter and the length,the smaller the stress concentration. Compared with length,diameter has a more significant influence.

关 键 词：种植义齿 三维有限元 长度 直径 

分 类 号：R782.12[医药卫生—口腔医学]