结论曲面断层摄影各部位变形失真率不同，这为指导临床工作，如颌骨畸形矫正术中截骨线位置的确定。

Conclusion Distortion at the different parts of the orthopantomograph is different, therefore, the result should be beneficial for the clinicians in determination of bone cut of orthognathic surgery.

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目的肿瘤术后造成的颌骨缺损使患者丧失咀嚼、语言等功能，并导致颜面畸形。

Objective Partial or full defects of jawbone following tumor resection frequently lead to a loss of mastication, an impaired speech function and a severe deformity of appearance.

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牙槽突裂骨移植是口腔颌面部裂隙畸形重建的重要步骤。

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

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