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为了解龙岩市中学生恒牙患龋情况，我们对本市抽查的12～17岁中学生7年间恒牙患龋率进行对比，并对1995年调查的2433名中学生的患龋特点进一步分析，结果报告如下。1对象与方法1989年至1995年间每年随机抽查龙岩市四所中学12～17岁中学生对））O多人进行恒牙龋蚀状况调查。其中
In order to understand the prevalence of dental caries among permanent high students in Longyan, we compared the prevalence of dental caries among 12 to 17-year-old middle school students aged 7 to 17 in our city and further analyzed the prevalence of caries in 2433 middle school students in 1995. The results are reported as follows . 1 objects and methods 1989 to 1995 randomly selected four secondary schools in Longyan City, aged 12 to 17 pairs)) O multi-people investigation of the status of permanent teeth caries. among them