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.
   唇侧梯形瓣及牙槽嵴顶部切口术式的术后愈合良好,而腭侧舌形瓣术式的术后有9例分别出现瓣膜肿胀、穿孔及出血。

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