弯曲或不成一线的牙齿是允许的，但缺齿属于严重缺陷。
A crooked or out of line tooth is permissible, however, missing teeth are to be severely faulted.
术前诊断依据齿突基底部缺如的影像学表现。
The diagnosis prior to surgery was based on radiography that documented the caudal portion of the odontoid absent.
术前诊断依据齿突基底部缺如的影像学表现。
The diagnosis prior to surgery was based on radiography that documented the caudal portion of the odontoid absent.
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