下頜中切牙(mandibular central incisor)是全口恒牙中體積最小的牙,形態(tài)較為對(duì)稱(chēng),其形態(tài)特點(diǎn)如下。1. 牙冠(1)唇面:下頜中切牙牙冠寬度約為上頜中切牙的2/3。唇面光滑平坦,似梯形,切頸徑明顯大于近遠(yuǎn)中徑,近中緣與遠(yuǎn)中緣對(duì)稱(chēng),近中切角與 (共 387 字) [閱讀本文] >>
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 下頜中切牙(mandibular central incisor)是全口恒牙中體積最小的牙,形態(tài)較為對(duì)稱(chēng),其形態(tài)特點(diǎn)如下。1. 牙冠(1)唇面:下頜中切牙牙冠寬度約為上頜中切牙的2/3。唇面光滑平坦,似梯形,切頸徑明顯大于近遠(yuǎn)中徑,近中緣與遠(yuǎn)中緣對(duì)稱(chēng),近中切角與 (共 387 字) [閱讀本文] >>