Methods: 1907 persons from 4 different nationalities were selected to measure the length of mandibule and the retromolar space and the incidence of impaction.

 
  • 方法:分别测量汉、维吾尔、哈萨克、锡伯族共1907人一侧下颌体长度及第二磨牙后间隙的距离,并调查其下颌智齿阻生率。
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