拔牙创不同愈合期对磨牙远移影响的三维有限元分析  

Three-dimensional finite element analysis of molars's distalization during different extraction periods of healing

作　　者：何淼[1] 李晓智[1] 王汉思[1] 李康宁[2] 

机构地区：[1]重庆医科大学附属第一医院口腔科,重庆400016 [2]解放军后勤工程学院流体力学教研室,重庆400016

出　　处：《山东大学学报（医学版）》2009年第10期68-71,79,共5页Journal of Shandong University:Health Sciences

摘　　要：目的用有限元方法分析拔牙创不同愈合期远移磨牙时第一磨牙和双尖牙的位移及牙周膜应力分布情况。方法利用CT图片,结合MIMICS、I-DEAS软件建立3组有限元模型,分别模拟第二磨牙存在、第二磨牙拔除后1周(拔牙创临床愈合期)、第二磨牙拔除后3个月(拔牙创骨愈合期)3种情况,对3组模型均进行相同力值的加载和计算。结果3组模型中第一磨牙牙周膜压应力集中区分布相似,压应力集中区主要位于腭根近中面、近颊根远中面偏根分叉处、远颊根远中面颈部。3组模型中第一双尖牙近中初始位移量:模型一>模型三>模型二。第一磨牙远中初始位移量:模型二>模型三>模型一。结论拔牙后早期移动牙齿,可获得较好的支抗控制与较快的牙移动速度。Objective To analyze displacement and stress distribution of the periodontal ligament of the first molars and premolars during different extraction healing stages by using the finite element method.Methods Advanced CT scanning and MIMICS,I-DEAS software were used to establish three finite element models：simulated existence of the second molar,simulated one week after the second molar was extracted（clinical healing stage）,simulated three months after the second molar was extracted（bone healing period）.The three groups of models were carried out under the same power load and calculation.Results The stress concentration area of the first molar＇s periodontal ligament was similar in the three models,pressure stress concentration area was mainly located at the near level of the palatal root,the distal level of the near buccal root and near furcation department,and the distal cervical level of the far buccal root.In the three model groups,the near initial displacement of the first premolars：model Ⅰ〉 model Ⅲ 〉model Ⅱ,and the distal initial displacement of the first molars：model Ⅱ〉 model Ⅲ〉 model Ⅰ.Conclusion Extraction of the second molars is of help to early shift the first molars to a distal level.

关 键 词：正畸学 矫正 拔牙 磨牙 支抗 有限元分析 

分 类 号：R783.5[医药卫生—口腔医学]