个别后牙反猞对颞下颌关节应力影响的三维有限元研究  

Three-dimensional finite element analysis on the effect of posterior cross-bite of individual teeth on temporomandibular joint

作　　者：林有籁[1] 刘月华[1] 王冬梅[2] 许君武[3] 

机构地区：[1]同济大学口腔医学院正畸科,上海200072 [2]上海交通大学机械与动力工程学院 [3]福建医科大学省立临床医学院福建省立医院口腔科

出　　处：《中华口腔医学杂志》2013年第2期86-90,共5页Chinese Journal of Stomatology

摘　　要：目的对比分析牙尖交错验时个别后牙反拾和正常拾颞下颌关节（temporomandibularjoint，TMJ）内各结构的应力分布情况，以期从生物力学角度为个别后牙反拾正畸治疗的必要性提供依据。方法利用已建立的正常拾TMJ几何模型，建立个别后牙反拾和正常拾TMJ三维有限元模型。对两种模型施加相同的猞力（100N）和边界条件，模拟牙尖交错猞时的工况加载，分析比较个别后牙反验和正常拾TMJ的应力分布情况。结果与正常猞相比，个别后牙反耠TMJ内部各结构应力分布规律无明显变化，但应力值有所增大，且分布更不均匀。个别后牙反拾关节盘vonMises应力最大值为0．792MPa，最大主应力最大值为0．598MPa，最小主应力最大值为-0．744MPa；正常拾关节盘vonMises应力最大值为0．592MPa，最大主应力最大值为0．395MPa，最小主应力最大值为-0．554MPa。结论牙尖交错拾时个别后牙反袷双侧TMJ内应力分布不均匀，应力值比正常验有所增大，可引起TMJ的超负荷应力和局部应力集中，临床上应对个别后牙反猞进行及时积极的治疗。Objective To analyze the stress distribution of temporomandibular joint （TMJ） in posterior cross-bite of individual teeth and in normal occlusion during the intercuspal occlusion （ICO）. Methods On the basis of the geometric TMJ model of normal occlusion, the TMJ finite element model of posterior cross-bite of individual teeth was reconstructed. The occlusal force and boundary conditions were applied on the model. Using three-dimensional finite element method （FEM） , the stress distribution of TMJ in posterior cross-bite of individual teeth was analyzed by simulating the ICO load. Results No significant differences were found in stress distribution in various TMJ structures between posterior cross-bite of individual teeth and normal occlusion. However, the stress level was higher and the stress distribution was more inhomogeneous in posterior cross-bite of individual teeth than in normal occlusion. In the cross-bite malocclusion of individual posterior teeth, the maximum of yon Mises stress was 0. 792 MPa, the maximum principal stress was 0. 598 MPa and the mimimum principal stress was -0. 744 MPa. But in normal occlusion, the maximum of yon Mises stress was 0. 592 MPa, the maximum principal stress was 0. 395 MPa and the mimimum principal stress was - 0. 554 MPa. Conclusions When the ICO load was applied, the stress distribution of TMJ was more inhomogeneous and the stress level was higher in posterior cross-bite of individual teeth than in normal occlusion.

关 键 词：错猞 颞下颌关节 有限元分析 

分 类 号：R783.5[医药卫生—口腔医学]