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我们于１９９８年４月对延安市人群口腔健康情况进行了抽样调查，现将龋病、牙周疾病现状调查结果报告如下。对象与方法采用根据世界卫生组织１９８７年公布的口腔健康调查基本方法（第三版）为调查标准，使用统一设计的表格。在延安市十二县一区一矿各设调查点一个，按要求各
We conducted a sample survey of oral health in Yan'an City in April 1998. The results of the survey on dental caries and periodontal disease are reported below. Subjects and Methods The survey was based on the basic method of Oral Health Survey published by the World Health Organization in 1987 (the third edition), and a unified design form was used. In Yan'an City, twelve counties and one ore each set a survey point, according to the requirements