不同角度上颌埋伏中切牙牙合向牵引牙周应力分布的分析  

Finite element analysis of periodontal tissue stress distribution of different angel impacted central incisor

作　　者：汤荟文 回记芳 郑文涛[3] 邵玶[1] 

机构地区：[1]哈尔滨医科大学口腔医学院,150001 [2]西安交通大学口腔医院 [3]沈阳工业大学

出　　处：《现代口腔医学杂志》2016年第1期16-19,共4页Journal of Modern Stomatology

基　　金：黑龙江省教育厅科学技术项目(12541486)

摘　　要：目的分析上颌埋伏中切牙在牙合向牵引过程中,对同一位置施加不同角度各种牵引力值时,牙周组织应力分布特点并找出最适牵引力值,从而为临床正畸治疗埋伏牙提供基础理论参考。方法利用CBCT原始数据结合MIMICS和Ansys软件构建牙齿及其支持组织的三维模型。在牙齿切端沿其长轴方向进行16种工况下的力学加载:牵引力方向与牙体长轴夹角分别为100°,120°,140°和160°;加载力分别为40g,60g,80g和100g。比较不同工况下牙周膜Von Mises应力分布的特点。结果牵引方向与牙体长轴之间角度为100°时,最适应力值约为40g;成角120°时,最适应力值应小于40g;成角140°时最适应力值应接近60g;成角160°时最适应力值约为40g。结论当牵引力方向与牙体长轴间角度不变,牙周膜所受应力随着牵引力的增大而增大;当加载力值相同,随着牵引力方向与牙体长轴间夹角逐渐增大时,牙周膜所受应力和牙齿最适牵引力值并非随之递增;牵引埋伏牙最大应力值不应超过60g。Objective To analyze the stress of periodontal tissue of an impacted maxillary central incisor when loaded with different forces from distinct directions during the time it being drawn occlussaly by establishing the model of a impacted maxillary central incisor, so as to provide reference for clinical treatment. Methods A three-dimensional finite element model of an impacted maxillary central incisor and its periodontal tissues was established. The model was loaded with 16 mechanical situations （Angel： 100°, 120°, 140° and 160°; Traction Force： 40g, 60g, 80g and 100g）. Results The optimal traction force for 100°, 120°, 140°and 160° is 40g, less than 40g, 60g and 40g. Conclusion When the angel is settled, along with the increase of traction force, the Von Mises stress values increase. When the same force is exerted, the trend of Von Mises stress values do not follow the angulation changes. During the traction,the maximum force should not be any heavy than 60g.

关 键 词：埋伏中切牙 三维有限元 不同角度牵引力和牵引力值 牙周应力分布 

分 类 号：R783.5[医药卫生—口腔医学]