无托槽隐形矫治器联合附件扭转下颌左侧第二前磨牙的三维有限元分析  

Finite Element Analysis of Mandibular Left Second Premolar Rotated with Attachment Bonded Clear Aligner

作　　者：向彪 王星星 杨颜菁 徐逸晨 王梦含 吴刚 XIANG Biao;WANG Xingxing;YANG Yanjing;XU Yichen;WANG Menghan;WU Gang(Medical Department,Shanghai Smartee Dental Technology Co.,Ltd.Shanghai 201210,China;Shanghai Stomatological Hospital,Fudan University,Shanghai 200001,China)

机构地区：[1]正雅齿科科技(上海)有限公司临床医学系统,上海201210 [2]复旦大学附属口腔医院上海市口腔疾病防治院,上海200001

出　　处：《口腔医学研究》2022年第12期1192-1198,共7页Journal of Oral Science Research

基　　金：上海市级医院新兴前沿技术联合攻关项目(编号:SHDC12019126)。

摘　　要：目的:采用三维有限元方法分析无托槽隐形矫治扭转下颌左侧第二前磨牙时,不同附件和不同扭转量对下颌左侧第二前磨牙牙周膜应力及位移影响。方法:应用CT获得患者下颌骨牙列DICOM文件,运用Mimics、Geomagic Hypermesh等软件分别制备无附件、矩形附件和扭转附件旋转下颌第二前磨牙1.2°、2.5°和3.3°等9个模型,分析下颌左侧第二前磨牙移动趋势及牙周膜应力分布。结果:各组模型下颌左侧第二前磨牙牙周膜应力云图分布相似,但附件组应力值明显大于无附件组,扭转附件组>矩形附件组,且3.3°>2.5°>1.2°,各模型中牙周膜应力最大值为10.15 MPa,最小值为6.106 MPa;各附件扭转下颌左侧第二前磨牙旋转移动时,各组位移量大小为扭转附件组>矩形附件组>无附件组,2.5°>3.3°>1.2°,各模型中下颌左侧第二前磨牙最大位移值为1.439×10^(-2)mm,最小位移值为9.15×10^(-3)mm;且牙齿呈一定倾斜和压低移动趋势。结论:无托槽隐形矫治器扭转下颌左侧第二前磨牙时,扭转附件扭转2.5°更有利于旋转牙齿的实现。Objective:To analyze the effects of attachments and rotation values on the stress distribution of periodontal ligament and displacement distribution of mandibular left second premolar with three-dimensional finite element method.Methods:The DICOM files of mandibular dentition were obtained with CT.Nine three-dimensional finite element models,i.e.mandibular left second premolar rotated 1.2°,2.5°,and 3.3°without attachment,rectangular attachment,and torsion attachment,were established with Mimics and Geomagic Hypermesh software,respectively.The displacement tendency and the stress distribution were analyzed.Results:The stress distribution of periodontal ligament of all models were similar,however,the attachment group>without attachment group,the torsion group>the rectangular attachment group,3.3°>2.5°>1.2°,the maximum stress value in all models was 10.15 MPa,and the minimum stress value was 6.106 MPa.When the mandibular left second premolar was rotated with attachment,the displacements were as follows:the torsion group>the rectangular attachment group>without attachment group,2.5°>3.3°>1.2°,the maximum activation value for left second premolar in all models was 1.439×10^(-2) mm,the minimum value was 9.15×10^(-3) mm,and there were intrusion and inclination tendency in all models.Conclusion:When rotating the mandibular second premolar with clear aligner,rotated the torsion attachment for 2.5°favors the tooth rotation.

关 键 词：无托槽隐形矫治器 三维有限元分析 第二前磨牙扭转 扭转附件 牙周膜 

分 类 号：R783.5[医药卫生—口腔医学]