中文摘要：

目的探讨4种方法预防乳磨牙龋病的临床效果。方法选取2015年1～6月本辖区（深圳市宝安区）160例3～5岁幼儿为研究对象,根据防龋方法的不同分为四组,每组40例,A组采用含氟牙膏刷牙,B组为含氟牙膏刷牙＋涂氟保护漆,C组为含氟牙膏刷牙＋流体树脂窝沟封闭,D组为含氟牙膏刷牙＋流体树脂窝沟封闭＋涂氟保护漆。分别对四组幼儿干预后6、12、18个月患龋情况进行观察。结果 A组干预后6、12、18个月的乳磨牙龋患率分别为5.00%、15.00%、40.00%,B组干预后12个月龋病发生率为5.00%,干预后18个月为25.00%,C组干预后12个月龋病发生率为10.00%,干预后18个月为25.00%,D组干预后18个月龋病发生率为10.00%,干预后18个月A组龋病发生率显著高于B组、C组、D组,D组龋病发生率最低,差异有统计学意义（P〈0.05）。邻面龋发生率显示,四组在干预后6、12个月时均无邻面龋发生,A组干预后18个月时的邻面龋发生率为15.00%,B组与C组均为10.00%,D组无邻面龋发生,D组与A组、B组、C组比较,差异有统计学意义（P〈0.05）。四组干预后6、12、18个月的龋均显示,B组、C组、D组在18个月时的龋均明显低于A组,差异有统计学意义（P〈0.05）。结论单用含氟牙膏刷牙的乳磨牙龋病预防效果最差,含氟牙膏刷牙＋流体树脂窝沟封闭＋涂氟保护漆的预防效果最好,氟保护漆具有保护窝沟封闭剂作用,也能预防封闭剂脱落,对儿童乳磨牙龋病具有显著预防作用。

英文摘要：

Objective To investigate the clinical effect of 4 different methods for preventing dental caries in deciduous molars.Methods 160 cases of children aged 3-5 years in this district（Baoan District of Shenzhen City） from January to June in 2015 were selected as the research objects and divided into four groups with 40 cases in each group according to the different preventing decay methods.Children in group A used fluoride toothpaste to brush their teeth,children in group B used fluoride toothpaste to brush their teeth and their teeth were coated with fluoride protection paint,children in group C used fluoride toothpaste to brush their teeth and their teeth were coated with liquid resin pit and fissure sealant,children in group D used fluoride toothpaste to brush their teeth and their teeth were coated with fluoride protection paint and liquid resin pit and fissure sealant.The caries status of children in 4 groups 6,12,18 months after intervention were observed.Results In group A,the caries prevalence rates of primary molars was respectively 5.00%,15.00% and 40.00% when 6,12,18 months after intervention,which was 5.00%,25.00% 12,18 months after intervention in group B,with 10.00% 12 months and 25.00% 18 months after intervention in group C,and with 10.00% 18 months after intervention in group D.The incidence of dental caries in group A 18 month s after intervention was significantly higher than that of group B,group C or group D,the incidence of dental caries in group D was the lowest and there were statistically significant differences（P〈0.05）.The incidence of adjacent caries showed that no caries occurred in 4 groups at the end of 6,12 months intervention.The incidence of adjacent caries in group A was 15.00% 18 months after intervention,10.00% in both group B and C and there was no adjacent caries in group D.There was significant differences between group D and group A,group B,group C（P 〈0.05）.The caries showed in 4 groups6,12,18 mo nths after intervention that the caries in group B,group C or group