临床常见的安氏Ⅱ类Ⅰ分类错　是正畸治疗中难度比较大的一类。本文重点探讨应用镍钛弓加口外弓联合矫治安氏Ⅱ类Ⅰ分类不拔牙病例，经临床观察，疗效满意，现报告如下。１ 临床资料与方法１．１ 临床资料 选择处在生长发育高峰期１５例患者，均在恒牙初期，其中男６例，女９例 Clinical Class Ⅱ Class Ⅰ common misdiagnosis of orthodontic treatment is more difficult in a class. This article focuses on the application of nickel titanium arch combined with external bowel correction class Ⅱ class Ⅰ non-extraction of dental cases, the clinical observation, the curative effect is satisfactory, are as follows. 1 Clinical data and methods 1.1 clinical data selection at the peak growth and development of 15 patients were in the early permanent teeth, including 6 males and 9 females