摘要
利用Auto CAD软件及螺旋CT扫描技术与有限元应力分析方法相结合 ,在活体基础上建立TMJ三维非线性有限元模型并比较不同接触状态下关节内应力的变化。结果表明 ,TMJ内盘 突之间有接触模型的关节盘和髁突表面应力主要分布在前、内侧 ,其他区域应力相对较小 ,而无接触模型的表面应力主要分布在中后部和内侧 ,且力值较大。摩擦系数在 0 0 .15范围 ,盘 突之间接触应力的分布范围和大小完全相同 ,同时 ,无摩擦接触、刚性接触和弹性接触三种盘 突接触方式下的关节盘和髁突表面应力基本一致。结果提示 ,在三维非线性模拟TMJ力的接触问题中 ,TMJ盘 突之间全部接触关系的关节内应力分布更符合生理。关节内较低的摩擦系数(0 0 .15 )及不同的盘 突接触方式对其应力分布状态无明显影响。TMJ各结构之间的接触模拟可使其力的三维非线性分析更合理。
Purpose: To analyze the effect of the intraarticufar contact of the temporomandibular joint ( TMJ ) on three dimensional nonlinear simulation of human TMJ forces in order to simulate the distribution and transfer of TMJ forces more realistically and logically. Materials and Methods: Combining helical CT scanning technology with three dimensional finite element method, together with Auto CAD software, three dimensional nonlinear finite element models were developed in vivo for comparison with the changes in the stress within the TMJ in different contact conditions. Results: The stresses on the surfaces of articular disc and condyle in the finite element models with contact elements between the disc and condyle were mainly distributed on their anterior and medial regions, and the stresses on other regions were relatively smaller. But, the stresses of those models without contact element were mainly distributed on their midposterior and medial aspacts. Moreover, the stress values were higher. When the friction coefficient was in the range of 0 0.15, the distribution extent and magnitude of the contact stress between the disc and the condyle in the TMJ were completely same. Meanwhile, the surface stresses on the disc and the condyle were nearly coincident in three ways of disc condyle contact, which were no friction contact, rigid contact and elastic contact. Conclusion: In the issue of disc condyle contact of simulating TMJ forces with three dimensional nonlinear method, the stress distribution in the joint with complete contact relationship between the disc and the condyle conforms more to the physiological condition. The lower friction coefficient ( 0 0.15 ) in the TMJ and various contact patterns between the disc and condyle had no evident influence on the stress distribution in the TMJ. Three dimensional nonlinear analysis for the forces in the TMJ might be more realistic and reasonable because of contact simulation among various structures within the TMJ.
出处
《解放军医学杂志》
CAS
CSCD
北大核心
2000年第6期424-427,共4页
Medical Journal of Chinese People's Liberation Army
基金
国家自然科学基金(编号39900165)
中国博士后科学基金(1998-6)资助课题
关键词
颞下颌关节
有限元法
三维非线性模拟
接触分析
应力分布
Temporomandibular joint
Finite element method
Three-dimensional nonlinear simulation
Contact analysis
Stress distribution
