Result : the midfacial complex was displaced anteriorly , forward growth of mandible was restricted ; the mandible exhibited a downward and backward rotation ; an significant increase was showed on the lower facial height ; the class incisor relationship was corrected by anterior displacement of the upper incisors and posterior displacement of the lower incisors 結(jié)果:上頜向前移位改良生長量,下頜的向前生長受到抑制;下頜以髁突為中心向下、后旋轉(zhuǎn),使下頜空間位置發(fā)生變化;下頜的順時針旋轉(zhuǎn)將造成面下1 3長度增大;上、下頜前牙發(fā)生牙性代償?shù)难陲椬饔谩?