Materials and methods Begg tip-back arch wire was ligated to the gingival side of edgewise brackets and Class ⅱ elastics were used.

  • 方法将Begg矫正技术中的有后倾弯的唇弓改良,放于方丝弓托槽的龈方,结扎丝将其悬吊于托槽上,再通过适当Ⅱ类牵引和下颌的颌内牵引,打开咬合。

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