中文摘要：

目的：比较含氟涂料和含氟泡沫对儿童乳牙龋病的预防效果，为在我国开展乳牙龋病防治工作提供理论依据。方法随机整群抽样的方法抽取2所幼儿园的3～4岁儿童共220名，进行口腔检查，记录患龋情况。随机将这些儿童分为含氟泡沫组和含氟涂料组，分别用氟泡沫和氟保护漆进行龋齿预防，每半年1次，2年共干预4次，每年进行口腔检查，比较2组基线后1年和2年的乳牙新生龋均、新生龋面均及龋齿发病率。结果含氟泡沫组干预1年及2年后新生龋面均分别为2．58±4．36、3．85±5．15；含氟涂料组干预1年及2年后新生龋面均分别为0．95±2．28、1．94±3．32，均显著低于含氟泡沫组（ P＜0．01）。结论含氟涂料对儿童龋病的预防效果优于含氟泡沫。

英文摘要：

Objective To compare the preventive effect of fluoride varnish and fluoride foam on caries increment in deciduous teeth over a two-year period and to provide theoretical basis for the caries prevention in the primary dentition in China. Method 220 chil-dren at 3~4 years old from two kindergartens were chosen with cluster sampling method and were randomly divided into two groups, fluoride foam group and fluoride varnish group. They received topical fluoride application four times over a 2？year period of time. Oral examination was carried out every year. All the data were collected and the caries incidence, the mean increments of dmft （ decayed, missing and filled teeth） and dmfs （ decayed, missing and filled surfaces） of the two groups were compared. Results The mean incre-ments of dmfs of the foam group after one and two years’ intervention were 2.58±4.36 and 3.85±5.15;and those of the varnish group were 0.95±2.28 and 1.94±3.32. The differences between the two groups were statistically significant（P〈0.01）. Conclusion Fluoride varnish is more effective than fluoride foam in preventing caries of primary teeth.