1.In the light of different position, the mesiodens were extracted respectively by the technique of labial ladder-shaped flap, palate-tongue shaped flap or incision of alveolar ridge crest.

1.唇侧及牙槽嵴顶部切口术式的术合良好,而腭侧舌术式的术有9分别出现膜肿胀、穿孔及出血。