对无锡市４１２４名青少年进行错及牙周疾病情况调查，结果表明错患病率为４２．６８％，牙周疾病患病率为５４．７８％。错者的牙周疾病患病率明显高于正常者，两者间差异有非常显著意义（Ｐ＜０．０１）。错的临床表现以牙列拥挤最为多见，而牙列拥挤者的牙周疾病患病率最高，为９０．１６％。提示牙列拥挤是牙周疾病形成的客观条件，而对牙列拥挤的矫正治疗是恒牙期错矫治的主要工作 Misdiagnosis and periodontal disease survey of 4124 adolescents in Wuxi City showed that the prevalence rate of misdiagnosis was 42.68% and the prevalence rate of periodontal disease was 54.78%. The prevalence of periodontal disease was significantly higher than that of normal controls, with significant difference between the two (P <0.01). The clinical manifestations of malocclusion crowded the most common dentition, and dentition crowded person the highest prevalence of periodontal disease, 90.16%. Prompted that the crowding of the dentition is an objective condition for the formation of periodontal disease, while the correction of crowding of the dentition is the main work of the correction of permanent dentition