由于先天或后天的一些因素，导致下颌骨部分缺损或不对称，而这种缺损或不对称常常导致严重的功能丧失和颜面畸形。

Mandibular segmental defect or asymmetry due to congenital or acquired factors will lead to severe functional incapacitation and facial deformity.

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由于先天或后天的一些因素，导致下颌骨部分缺损或不对称，而这种缺损或不对称常常导致严重的功能丧失和颜面畸形。

Mandibular segmental defect or asymmetry due to congenital or acquired factors will lead to severe functional incapacitation and facial deformity.

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