单侧髁突骨折对下颌骨应力分布的影响

目的 探讨单侧髁突骨折对下颌骨应力分布的影响，用以分析颞下颌关节损伤引起颞下颌关节紊乱病的生物力学机制。方法 采用三维有限元应力分析方法，对模拟正中咬合状态下的健康人及右侧髁突颈部骨折、错位愈合所致颞下颌关节紊乱病患者下颌骨的应力分布特征进行对比、定量分析。结果 该患者两侧下颌骨相对应部位最大、最小主应力大小及性质均有差异。骨折侧下颌骨应力明显大于非骨折侧，呈不对称性应力分布，尤以髁突应力异常最为

Effect of unilateral condylar fracture on stress distribution in the mandible

Objective To investigate the effect of unilateral condylar fracture on stress distribution in the mandible in order to realize primarily the biomechanical mechanism of temporomandibular joint disorders (TMD) resulted in by joint injury Methods The stress distributions in the mandible of a normal human and a patient with TMD induced by right condylar fracture following malposition healing were analyzed and compared quantitatively during centric occlusion by three dimensional finite element method Results The patient contained the unbalanced stress distribution in the mandible, such as different nature and value of stress The stress in the fractured side was higher than the non fractured side, in which condyle is more evident The maximum principal stress and minimum principal stress of each region in his mandible were much higher than that in a normal mandible Its stress quality changes also The stress in his mandible was distributed asymmetrically Conclusion Unilateral condylar fracture not only damaged its structure, but also induced the badness of its biomechanical environment, in which condyle was the most sensitive region during the stresses in the mandible were changed It was preliminarily thought that unbalanced stress distribution, evidently increased stress and varied stress character were one of biomechanical mechanism of TMD