调查方法及标准1.应城市内幼儿园、小学、初中各两所,根据随机抽样原则共检查了2523名儿童及学生。其中男性1268名,女性1255名,分为11个年龄组。2.本调查均采用室内自然光线,口内直视检查法。通过问诊.视诊等方法对受检者的颌面部软组织、牙弓的形态,牙列类型、牙齿数目、排列情况和咬(牙合)情况等均做详细的检查和诊断。 Survey methods and standards 1. In the city of kindergartens, primary schools, junior high school two, according to the principle of random sampling a total of 2523 children and students were inspected. Among them, there are 1268 males and 1255 females, divided into 11 age groups. 2. The survey are used indoor natural light, open mouth examination method. Visual examination and other methods were used to examine and diagnose the maxillofacial soft tissue, dental arch, dentition type, number of teeth, alignment and bite.