... 牙颈 cervix dentis 牙颈（部） dental cervix 牙颈线 cervical line ...
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Methods the first molar was welded with a molar root movement controller, which extending backward and clinging to the edge of second molar dental cervix.
方法在第一磨牙带环上焊接一控根移动杆，其杆向后延伸紧贴第二磨牙牙冠颈缘上。
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