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.
获得精确的位置信息的同时不依赖于光斑强度、形状、对称性或尺寸。
Accurate position information is obtained independent of the light spot intensity profile, symmetry or size.
在实际测量中，由于光斑具有一定尺寸和不对称性，在很大程度上影响了位置敏感探测器(PSD)的定位精度。
In practical measurement, the positioning precision of position sensitive detector (PSD) is greatly affected by the size and asymmetry of the spot.
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