AIM: To establish a temporomandibular joint (TMJ) model including mandible by means of three dimensional finite element methods and to analyze the stress distribution of TMJ during mandibular distraction osteogenesis in the middle of the chin.

• 目的 :建立包括下颌骨的颞下颌关节 (TMJ)三维有限元模型 ；分析该模型在下颌骨颏部正中牵张成骨过程中颞下颌关节的应力分布特征 .