关键词: 患龋率, 学龄儿童, 窝沟封闭, 第一恒磨牙, 龋病流行状况

Abstract: Objective To investigate the prevalence of dental caries of 8-year-old urban pupils in Xiangfang District of Harbin, and compare it with the results in 2015 to explore the trend of dental caries. Methods A sample of 1915 8-year-old pupils（Grade Three） who were from 10 primary schools in towns of Xiangfang District of Harbin was drawn for general survey. The survey included the dental caries of primary and permanent teeth, the first permanent molar eruption and pit and fissure sealant on first molar. Results The caries prevalence rate of the students was 91.23％, among which the caries prevalence rate of students’ deciduous teeth was 88.36％, with a xdmft of 5.49, xdmfs of 10.21 and the percent of filled teeth was 31.95％.The caries prevalence rate of students’ permanent teeth was 41.67％(There was a significant difference between male and female).The xDMFT was 0.95 and the xDMFS was 0.96.The eruption rate of the first permanent molar was 98.08%.The closure rate was 63.71% and the retention rate of sealant was 84.50%.These values were higher than those of 2015. Conclusion In recent years, the prevalence rate of dental caries among primary school students aged 8 years old in Xiangfang District of Harbin has been on the rise . Public awareness of caries prevention should be raised.

Key words: caries prevalence, School-age children, pit and fissure sealant, first permanent molar, prevalence of dental caries.