为了解我市人群中异常牙列发生情况，于1995年4～5月份在我市33个乡镇中对不同年龄组人群的牙列异常情况作了调查，现将结果小结如下。1对象与方法1．1对象为全市33个乡镇3岁以上中小学幼儿园学生、居民，共4569人。1．2器械为额镜、探针。1．3方法按口腔卫生学中规定的口腔牙 In order to understand the occurrence of anomalous dentition in our city, we investigated the anomalies of dentition in different age groups in 33 villages and towns in our city from April to May in 1995. The results are summarized as follows. 1 objects and methods 1.1 for the city's 33 towns and villages over the age of 3 primary and secondary kindergarten students, residents, a total of 4569 people. 1.2 equipment for the forehead, probe. 1.3 Methods according to oral hygiene prescribed oral teeth