目的通过动物实验对牙齿近中移动的发生机制进行探讨。
Objective To study the mechanism of tooth mesial migration with animal experiment.
实验研究也显示在阻止磨牙近中移动方面，该系统优于腭托及唇挡。
The experiment also show the removable heavy labial wire anchorage system is better than Nance palatal arch and lip bumper.
目的了解下颌第二恒磨牙不同载荷下近中移动时的位移及应力分布情况。
Objective To investigate the displacements and the stress distributions of a mandibular second molar.
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