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【单选题】
关于恒前牙和乳前牙的牙冠宽度差异量补偿方法，下列说法错误的是A.
乳牙间有适当的牙间隙
B.
恒切牙萌出偏向唇侧
C.
乳牙恒牙的大小比例不协调
D.
前磨牙萌出时较乳牙偏向颊侧，增加了牙弓宽度
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