安氏Ⅲ类错是临床常见的错畸形 ,它严重影响儿童颅面部正常生长发育 ,并随年龄的增长而日益加重。近年来有学者对儿童骨性Ⅲ类错的颅面形态进行了研究 ,发现该错早期已具有成人安氏Ⅲ类错颅面形态大部分的特征[1] ,表现为颅底结构、面部矢状和垂直向关系和牙及牙槽、 Class III malocclusion is a common clinical malocclusion deformity, which seriously affect the normal development of children's craniofacial growth, and increasing with age and increasing. In recent years, some scholars have studied the craniofacial morphology of skeletal Class Ⅲ malocclusion in children and found that the malocclusion has most of the features of the malocclusion-type Ⅲ malocclusion in the early stage [1] , Facial sagittal and vertical relationship and teeth and alveoli,