A . ['恒前牙反https://assets.asklib.com/psource/2015111215063719186.jpg
B . 恒前牙萌出时出现中度拥挤C . 前牙开https://assets.asklib.com/psource/2015111215063719186.jpg
1mmD . 上下恒切牙萌出早期,出现前牙深覆https://assets.asklib.com/psource/2015111215063719186.jpg
E . 上下颌第一恒磨牙建https://assets.asklib.com/psource/2015111215063719186.jpg
初期,远中https://assets.asklib.com/psource/2015111215063719186.jpg