adj. edentulous
交错断缺的边排齿 ventilated heel tooth
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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.
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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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