皮皮学，免费搜题
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【单选题】
患者，男，11岁，下颌呈相对后退位，口唇闭合呈现口唇肌肉紧张，覆牙合5mm，覆盖9mm，四颗第一磨牙为Ⅱ类关系，上前牙拥挤明显，ANB角为10°，SNB角为84.5°，X线显示四颗第三磨牙存在，下颌Spee曲线明显。上颌前牙舌向内收，关闭间隙时，采用下列哪些措施（）
A.
Ⅲ类牵引
B.
上尖牙近中放置扩大螺旋簧
C.
在尖牙近中弯制垂直关闭曲
D.
颌间垂直牵引
E.
上颌磨牙近中移动
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