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。
Objective: to evaluate the capability of the apical tissue of rat molar to grow tooth root and periodontal tissue.
目的：探讨大鼠磨牙牙根根端组织发育牙根和牙周组织的能力。
CONCLUSION: MTA may be an ideal material for perforation repair and achieving apical seal in tooth with immature apex.
结论：本研究结果提示，MTA对穿孔修补和根尖屏障术方面是一种满意的材料。
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