英语语法分析

Birth Defects; Orofacial clefts; Casecontrol Study; Environmental risk factors.

唇腭裂；出生缺陷；病例对照研究；环境危险因素。

Bone grafting of the alveolus is an essential step in the reconstruction of the orofacial cleft deformity.

牙槽突裂骨移植是口腔颌面部裂隙畸形重建的重要步骤。

Objective To investigate the clinical use of segmental osteometomy in reposition of the implant to a more favorable orofacial position.

目的评价带种植体自体骨移植纠正种植体三维位置不良的临床效果。