目的评价遗传、环境因素在下颌磨牙长轴方向变化中的作用。
Objective To evaluate the interactions between environmental and genetic effects on the development of mandibular permanent molars 'axis.
第三前磨牙与第一磨牙长轴为近中倾斜，与人类第一前磨牙和第一磨牙近似。
The third premolar and the first molar of miniature pigs inclinate mesially, and are similar with the first premolar and the first molar of the human beings.
此外，套筒冠义齿可沿着基牙长轴传递合力，可以提供引导，支持作用，并能防止可能导致义齿脱位的各种运动。
Furthermore, telescopic crowns transfer occlusal forces along the long axis of the abutment teeth and provide guidance, support, and protection from movements that might dislodge the denture.
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