The survival ratio of bisected embryo is influenced by many factors.
有多方面因素影响分割胚胎的成活率。
Most of the third molar embryo had been formed and their tooth crowns had been calcified, the occurrence ratio was 84 0 % in maxilla and 85 2 % in mandible.
上下颌第三磨牙牙胚绝大多数已形成且牙冠已钙化完成，其出现率为上颌84 0 % ，下颌85 2 % ；
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