选择题:乳牙早失后是否要做功能性间隙保持器,需要考虑的因素有()

题目内容:

乳牙早失后是否要做功能性间隙保持器,需要考虑的因素有()

A.患儿的年龄和牙列拥挤的情况

B.牙齿萌出的先后顺序

C.继承恒牙胚发育的情况

D.乳磨牙缺失的部位和数目

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