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1·AIM: to study the periodontic response of ultrastructure during orthodontic tooth movement.

前言：目的：研究正畸牙齿移动过程中牙周组织超微结构的改变情况。

2·Objective to investigate the distribution and expression of bone morphogenetic protein-2 (BMP-2) in periodontic tissues during orthodontic tooth movement in rats.

目的探讨骨形成蛋白(BMP)超家族的成员BMP - 2在大鼠正畸牙齿移动过程中牙周组织的分布和表达。