前方牵引矫治器不同力值反作用力的三维有限元分析  

A three-dimensional finite element study on the reaction of different force values generated from maxillary protraction appliance

作　　者：刘宛鑫[1] 王旭霞[1,2] 张文娟 董瑞[1] 陈云[1] 张君[1,2] 

机构地区：[1]山东大学口腔医学院,山东济南250012 [2]山东省口腔生物医学重点实验室,山东济南250012 [3]山东省中医药大学附属医院口腔科,山东济南250011

出　　处：《上海口腔医学》2013年第5期498-503,共6页Shanghai Journal of Stomatology

基　　金：山东省自然科学基金(ZR2011HM036);山东省医药卫生科技发展计划项目(2011QZ023);济南市高校院所自主创新计划项目(201202032)~~

摘　　要：目的：通过建立包含颞下颌关节的颅颌面三维有限元模型,模拟前方牵引矫治器反作用力的加力方式,分析其在颞下颌关节区、颌骨的应力分布情况以及对各部位节点位移的影响.方法：选择1名健康男性受试者,通过CT扫描得到颅颌面的二维图像数据,借助Mimics、Magics、MSC等专用软件,采用连续、均质、线性、各向同性的线弹性材料,建立包括颞下颌关节和上、下颌骨的颅颌面三维有限元模型.然后在此基础上,根据前方牵引装置的反作用力原理建立加力模型,即采用与验平面成后上方37°的施力方向,于下颌最底部加载3～6 N的力值,采用ANSYS10.0有限元分析软件,测定颞下颌关节区、颌骨的应力分布情况以及各部分位移的变化,并对结果进行分析、归纳和整理.结果：在同一角度下,关节窝和髁突头、颈部应力随加载力的增大而增大,下颌最大应力出现在节点力加载部位颏部,上颌最大应力出现在刚性固定面.同时该模型出现微小的位移变化,颅颌面各部分位移随节点力的增大而增大,颅上颌位移由颅底部和验平面向颅顶部逐渐减小,下颌骨的位移由前部到后部逐渐减小,并出现顺时针方向旋转.结论：前方牵引矫治器对颞下颌关节区及颌骨产生反作用力的影响,且随着加载力的增大,其产生的反作用力和形变随之增大.颏部可能出现变形,下颌顺时针方向旋转.PURPOSE： To analyse the stress distribution of temporomandibular joint （TMJ） and jaw and the displacement changes of each part from the reaction force generated from maxillary protraction appliance by establishing a craniomaxillofacial three-dimensional finite element model （3-D FEM）. METHODS： A 3-D FEM of eraniofacial structure including TMJ and jaw was established from a male healthy subject by using CT scan and Mimics, Magics, MSC and other data analysis softwares. It was based on the linear elastic materials which were continuous, homogeneous, and isotropic. Then the simulation model in eraniofacial 3D structure model of maxillary protraction device was establish based on the reaction principle, and different forces from 3 N to 6 N with a 37° angle from the occlusal plane was loaded at the bottom of the lower jaw in order to measure and analyze changes of stress and displacement in TMJ and jaw with the finite element analysis software ANSYS10.0. RESULTS： At the same angle , the stress in articular fossa and the head and neck of condyle increased with the applied force. Maximum stress was located where the stress was loaded on the mandible and the rigid fixation of maxilla. Meanwhile, this model appeared slight variation of displacement which increased with loading force. The maxillary displacement from basis cranii and ocelusal plane to the parietal decreased gradually. Moreover, the mandibular displacement from the front to the rear was gradually reduced, arid clockwise rotation was appeared. CONCLUSIONS： The results indicate that maxillary protraction appliance has reaction force on TMJ and jaw. With increasing of loading forces, reaction fowes and deformation increase. At the same time, chin delbrmation may occur and the mandible has clockwise rotation. Supported by Natural Science Foundation of Shandong Province（ZR2011HM036）, Medical Heahh and Technology Development Project （2011QZ023） of Shandong Province and Independent Innovation Project of Jinan College Institute（201202032�

关 键 词：三维有限元 颞下颌关节 前方牵引 反作用力 

分 类 号：R783.5[医药卫生—口腔医学]