单选题:下牙列缺失后,下颌骨改变规律中,恰当的是(  )。

题目内容:
下牙列缺失后,下颌骨改变规律中,恰当的是(  )。 A.颌弓前段向下、向前吸收
B.下颌弓逐渐变小
C.颌弓后段向上、向外吸收
D.牙槽嵴变低、变宽
E.腭穹隆显低、浅
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答案解析:

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