南通市崇川区7-9岁儿童第一恒磨牙萌出、患龋及防治情况调查

Investigation of Tooth Eruption and Caries Prevalence and Prevention and Treatment of the First Permanent Molar in 7~9 Year-old Children in Cho ngchuan District of Nantong

目的对南通市崇川区7-9岁儿童第一恒磨牙（以下简称六龄齿）萌出情况、龋齿、龋齿治疗及窝沟封闭进行调查分析。方法采用整群、等比、分层抽样方法，对崇川区城郊14所小学，2369例儿童（7—9岁）的六龄齿进行龋病流行病学调查。结果总患龋率为19．00％，女生（21．52％）明显高于男生（16．63％）（X2=9．19，P〈0．05），城市儿童（18．75％）低于郊区儿童（22．44％），女生第一恒磨牙萌出率（97．76％）稍高于男生（97．60％），充填率（6．04％）很低，窝沟封闭率（O．86％）更低。结论儿童第一恒磨牙龋坏率高，建议对六龄齿进行早期防龋治疗，实施窝沟封闭，最佳时期为7-9岁。

Objective To investigate tooth eruption, caries prevalence, treatment of caries and pit and fissure sealant of the first permanent molar （hereafter referred to as six-year teeth） in 7-9 year-old children in Chongchuan District of Nantong. Methods With the methods of cluster, equal proportion and stratified sampling, 2369 children（7-9 year old） from 14 suburbs and city schools in Chongchuan District were selected. Their six-year teeth were examined. Results The total caries incidence rate of six-year teeth was 19.00%. The figure was 21.52% and 16.63% in girls and boys respectively（X2=9.19, P〈0.05）. The rate of city children（18.75%） was lower than that of suburbs children （22.44%）. The eruption rate of the first permanent molar in girls was 97.76% and 97.60% in boys. The filling rate was only 6.04%, but pit and fissure sealant rate was much lower. It was 0.86%. Conclusion Caries incidence of first permanent molar in 7-9 year children in Chongchuan District of Nantong is high and early prevention should be taken. The best period of pit and fissure sealant is 7-9 year old.