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1994年我们使用窝沟封闭方法，对某校中学生进行牙齿窝沟封闭，并进行17个月的效果观察，现将结果总结如下。1对象与方法1．1对象：对某中学的3O7名初一学生进行口腔检查。经窝沟封闭的113名学生为试验组，194名未接受治疗和南沟封闭的学生为对照组。两组学生年龄均为12～13岁
In 1994, we used the method of pit and fissure sealant to seal the pit and fissure of a school middle school student and observed the effect for 17 months. The results are summarized as follows. 1 objects and methods 1.1 Object: a high school 3O7 freshmen oral examination. One hundred and seventy-one students who were closed by pit and fissure seams were the experimental group, and 194 students who did not receive treatment and Nanogou closure were the control group. Two groups of students are 12 to 13 years of age