饮水氟含量与儿童龋齿和氟斑牙关系的调查

目的　调查不同饮水氟含量与龋齿和氟斑牙发病的关系 ,探讨在河南省实施饮水加氟的可行性。方法　选择河南省农村 4个不同饮水氟含量的自然村 ,调查 8～ 12岁儿童龋齿和氟斑牙患病率。结果　 4个不同饮水氟含量的村庄 8～ 12岁儿童龋齿患病率有随饮水氟含量升高而下降的趋势 ,但差异无显著意义 (P >0 .0 5 ) ,而氟斑牙患病率随饮水氟含量的升高而明显升高 (P <0 .0 1)。结论　水氟浓度的升高在导致氟斑牙的作用方面明显强于对龋齿的预防作用 ,而河南省是地方性氟中毒流行最严重的省份之一 ,在河南省实行饮水加氟导致氟斑牙流行的危险性较大

Study on correlation between fluoride content in drinking-water and dental fluorosis and caries of children

Objective To study the correlation between the development of dental fluorosis and caries and fluoride content in drinking water, and to find out the practicability of fluoridation in drinking water in Henan Province.Methods Four villages with various water fluoride contents in Henan were selected and children aged 8 to 12 in those 4 villages were examined for the incident of dental fluorosis and caries.Results Prevalence of caries in children, aged 8 to 12 decreased with water fluoride content decreasing and without significant difference(P>0.05), however, the prevalence of dental fluorosis increased dramatically with water fluoride content increasing and significant difference was found (P<0.01).Conclusions Increase in fluoride content in drinking water has more obvious effect on preventing dental fluorosis than preventing caries. It may harmful to employ fluoridation in drinking water in a region with high prevalence of fluorosis, such as Henan Province.