正畸学创立已一个多世纪,但正畸牙齿移动的真正、详细的生物学机理还远没有弄清楚。许多基木概念,随着进一步的研究,不断改进和更新。骨弹性学说、骨压迫学说、骨转化学说、pH 学说、骨压电效应学说和骨机械——化学学说等众说纷纭,尚无一种统一和公认的理论。可见正畸 Orthodontics has been established more than a century, but the real, detailed biological mechanism of orthodontic tooth movement is far from clear. Many basic concepts, with further research, continuous improvement and updating. Bone elasticity theory, osteoporosis theory, bone transformation theory, pH theory, bone piezoelectric effect theory and bone mechano-chemical theory have different opinions. There is no unified and accepted theory. Visible orthodontic