CONCLUSION: the tooth type or tooth position, root curvature and calcification have significantly influenced the outcome of root canal treatment.
结论：根管治疗的失败与牙位(牙类型和牙位置)、根管弯曲度和钙化度密切相关。
This paper proposed a new method that was based on network node and applied to compute tooth contract-point line of engaged gears for different mesh position.
本文提出了一种以网络结点为基础，在齿面上的活动标架里，计算齿轮在不同啮合位置的接触点，以求得接触迹线的新方法。
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。
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