通过对银川市3918名中小学生错牙合畸形情况进行调查发现,银川地区错牙合畸形的发病率为4724%,汉、回、满三种主要居住民族发病率无显著性差异。错牙合中以安氏Ⅰ类错牙合发病率最高,临床最常见的错牙合为个别牙错位。11岁和17岁为错牙合发病的两高峰期 The investigation of the malocclusion of 3918 primary and secondary school students in Yinchuan showed that the incidence of malocclusion was 4724% in Yinchuan, and there was no significant difference in the incidence of the three main resident ethnic groups in Han, Hui and Chong. The highest incidence of malocclusion Class I malocclusion is the most common clinical malocclusion for individual tooth dislocation. 11-year-old and 17-year-old for the incidence of malocclusion two peak