前方牵引反作用力对颞下颌关节区受力状况影响的有限元研究  

A study on effects of reactive force of maxillary protraction on force status of temporomandibular joint with finite element method

作　　者：李静[1] 王旭霞[2] 李涛[1] 刘宛鑫[1] 赵姝亚[1] 张君[1,3] 

机构地区：[1]山东大学口腔医院正畸科,山东济南250012 [2]山东大学口腔医院口腔颌面外科,山东济南250012 [3]山东省口腔生物医学重点实验室,山东济南250012

出　　处：《临床口腔医学杂志》2013年第9期519-523,共5页Journal of Clinical Stomatology

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

摘　　要：目的:建立并使用颅颌面三维有限元模型,研究前方牵引反作用力对颞下颌关节区以及整个下颌骨的应力分布和位移变化状况的影响。方法:选择1例健康成年男性志愿者,采用薄层螺旋CT扫描获取其颅颌面复合体二维图像原始DICOM数据,利用Mimics、Magics、MSC.Marc等图像处理软件建立颅颌面复合体三维有限元模型。利用ANSYS10.0软件,在下颌骨颏顶点处施加与牙合平面成37°角,大小为5 N的力并分析其受力状况。结果:①获得了精确细致的颅颌面复合体三维几何模型,其网格划分准确合理,与重建生物模型的形态相似性好,力学特性体现准确性高。②下颌骨的应力集中区域位于髁突顶部及颈部,髁突表面最大受力区域位于髁突前斜面。上颌骨表面应力集中区域位于关节窝,其中关节窝表面受力最大区域位于关节结节后斜面。③下颌骨的位移图显示位移大小从颏部至髁突逐级递减,其方向与施力方向一致。下颌骨位移变化最大处位于节点力加载部位,髁突部位位移变化量最小。结论:成功建立了包括颞下颌关节在内的颅颌面三维有限元模型,该模型具有很高的精确性,可用于前方牵引反作用力的相关研究。前方牵引反作用力会对颞下颌关节区以及下颌骨的应力分布和位移状况产生影响,但其是否会造成颞下颌关节紊乱还有待进一步研究。Objective：To offer scientific basis for clinical use of maxillary protraction by establishing and using a three-dimensional finite element model of craniomaxillofacial complex to study the stress and displacement distribution of TMJ and the whole mandible under the reactive force of maxillary protraction. Method：The original DICOM data of 2-D im- age craniomaxillofacial complex was acquired by thin-slice high resolution CT scanning from a healthy adult male.Then the 3-D FEM of craniomaxillofacial complex was established with the combination of Mimics,Magics and MSC.Marc software. And a force of 5 N downward the occlusion plane with an angle of 37~ were loaded at the gnathion of the mandible by using ANSYS 10.0 software. Result： （~）The precise and detailed 3-D geometrical model of craniomaxillofacial complex were ob- tained. The mesh generation was precise and reasonable;the constructed model had good comparability with the morphology of reconstructed organisms model;the constructed model was of quite precise mechanics characteristic.The stress concen- tration of the mandible was on the top and the neck of the TMJ. The region of the highest stresses was in the anterior slope of the condyle. The stress concentration of the maxilla was in the glenoid fossa and the stresses in the glenoid fossa were the greatest in the back slope of the articular eminence. The displacement diagram of the mandibular showed that the magni- tude of the displacement was decreasing step by step from the chin to the TMJ in the direction of the load applied. The re- gion of the largest displacement was around the force area,and the smallest was at the condyle. Conclusion：A accurate 3-D FEM of the skull including the TMJ was established successfully. The FEM model could be used to study maxillal protrac- tion.The reactive force of maxillary protraction could affect the distribution of stresses and displacement in TMJ and the mandible.Further studies were needed to elucidate whether or not the forces would induce the presence of T

关 键 词：前方牵引 颞下颌关节 三维有限元 颅颌面复合体 

分 类 号：R322.4[医药卫生—人体解剖和组织胚胎学] O242.2[医药卫生—基础医学]