Objective: To discuss the trend of displacement on the side of nondistraction when distraction osteogenesis with unilateral incomplete osteotomy. Methods: The method of finite element analysis was used to simulate distraction osteogenesis with unilateral incomplete osteotomy and the displacement of six marked point such as the TMJ and the angle of mandible and coracoid process and teeth etc, was observed on nondistractional side when the transport disc was distracted with a distance and without a distance. Results: When the transport disc was distracted without a distance, the Von mises stress was 0 in the six marked point ofnondistractional side and their displacement in 3 dimensions(x、y、z axis) was 0. When the transport disc was distracted with lmm width,all marked point had some displacement. Conclusions: When distracted and observed from the side of distraction, the mandible has the trend of contrarotation round the center of the transverse ridge midpoint of condyle process on the plane of sagittal whereas has the trend of parallel move approximately in the direction of opposite side on the plane of coronary at the side of nondistraction.%目的:分析犬下颌单侧不全截骨牵张成骨有限元模型,计算下颌骨非牵张侧各部分在牵张过程中位移状况.方法:模拟犬下颌单侧不全截骨牵张成骨,当滑动骨块受力未被牵开和被牵开时观察非牵张侧关节、下颌角、喙突及牙齿等6个标志点的位移情况.结果:当滑动骨块未被牵开时,非牵张侧下颌骨各标志点所受Von Mises应力为零,在空间x、y、z三轴位移均为零;当下颌骨滑动骨块被牵开1 mm时,各标志点在空间x、y、z三轴均有位移.结论:在行半侧不全截骨牵张成骨时,从牵张侧观察,非牵张侧下颌骨在矢状平面上有以髁突顶点(横嵴中点)为中心的逆时针旋转趋势,而在冠状平面上则表现为向牵张侧的近似平行的移动.
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