所有病例矫治中磨牙整体移动，矫治中和矫治后未发生磨牙的近中舌向旋转和近中倾斜。
The molars of all patients were moved orderly, and didn t take place mesiolingual rotation and medal tilt.
目的：3年随防观察近中阻生的下颌第三磨牙萌出情况与其倾斜角度的关系。
Objective: To measure changes in angular position and eruption status of mesially impacted mandibular third molars (M3) during 3-year follow-up period.
目的探讨在临床上上颌第一磨牙近中颊根第二根管(MB 2)的发现及扩通。
Objective To investigate the clinical discovery and expanding of the second mesiobuccal canal (MB2) in maxillary first molars.
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