中文摘要：

目的了解四川省6岁儿童患龋情况,探讨乳磨牙患龋与第一恒磨牙患龋之间的相关性。方法参照第三次全国口腔健康流行病学抽样调查方案,在四川省3个城市、3个农村随机抽样选取调查点,共调查714名6岁儿童的患龋情况,并分析乳磨牙患龋情况与第一恒磨牙患龋情况之间的相关性。结果四川省6岁儿童乳牙患龋率为74.37%,龋均为3.94±3.93,龋齿充填率为4.96%。乳牙患龋率和龋均在男性和女性、城市和农村儿童间无统计学差异（P〉0.05）,城市乳牙龋齿充填率高于农村（P〈0.05）。已萌的第一恒磨牙中有2.98%患龋,充填率为7.69%。乳磨牙患龋是第一恒磨牙患龋的危险因素[P=0.001,r=0.175,OR=5.756,95%C（I 1.733,19.121）],乳磨牙与第一恒磨牙的龋均呈弱相关（P〈0.001,r=0.194）。结论四川省6岁儿童乳牙患龋情况较重,乳磨牙龋坏可作为临床及预防工作中预测第一恒磨牙龋坏的因素之一。

英文摘要：

Objective To investigate caries status of primary and permanent teeth among 6-year-old children in Sichuan Province and correlation between caries of deciduous molars and first permanent molars.Methods Referenced to the sampling programme of the third national epidemiological survey of oral health status,a total of 714 children aged 6 were randomly sampled in clusters including 3 urban sampling spots and 3 rural sampling spots,the correlation bet-ween caries of deciduous molars and first permanent molars was explored.Results The prevalence rate of deciduous tooth caries of 6-year-old children in Sichuan province was 74.37%,the mean number of dmft of 6-year-old was 3.94±3.93,the filling rate was only 4.96%.The prevalence rate and mean dmft of deciduous tooth caries showed no signi-ficant difference between different area and gender（P〉0.05）,however,the children came from city showed significant higher filling rate than those from countryside（P〈0.05）.The first permanent molars erupted have 2.98% in caries,the filling rate was 7.69%.Caries of deciduous molars was the first permanent molars caries risk factors among 6-year-old children in Sichuan province[P=0.001,r=0.175,OR=5.756,95%CI（1.733,19.121）].There was weak correlation between caries of deciduous molars and first permanent molars（P0.001,r=0.194）.Conclusion Caries status of primary among 6-year-old children in Sichuan Province are serious.Caries experience of deciduous molars may play an impor-tant role in predicting the first permanent molars caries in clinic and prevention.