结论：牙在下颌骨上相对位置的变化会对其根尖主应力大小及方向产生一定的影响，而且其影响程度还会受到咬合对称性等因素的影响。
Conclusions: the variation of tooth position could affect the magnitude and direction of the main apical stress, in which the symmetry of the occlusion type was also involved.
结果：在对称性咬合，牙位的变化对各牙的根尖主应力方向无影响。
Results: the variation of tooth position gave no effects to the directions of principle stress around apex area in symmetrical occlusal type.
下颌前磨牙创伤咬合点加载的三维有限元应力分析。
Three-dimensional finite element analysis of the stress of the mandible premolar under loading on its traumatic occlusal spots.
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