唐山市小学生龋齿与饮水氟含量关系

摘要:目的　探讨唐山市小学生龋齿患病率与饮水氟含量之间的关系以及本地区预防龋齿的适宜水氟浓度。方法　随机抽取12所小学的2～5年级的学生（每年级抽取约50人）进行龋病调查，分别计算患龋率、龋均、患者龋均，并按饮水氟含量不同将学生分为不同的大小接触组，即≤0.3、0.4、0.5、0.6、0.7、0.8、0.9、1.0、1.1、＞1.1 mg/L 10个小接触组和≤0.3～0.6、0.7～0.9、1.0～1.1 mg/L 3个大接触组。结果　≤0.3、0.4、0.5、0.6 mg/L 4个小接触组患龋率（χ2＝2.103，P＞0.05）、龋均（F＝0.136，F＜F0.05，P＞0.05）、患者龋均（F＝0.079，F＜F0.05，P＞0.05）差异无统计学意义；0.7、0.8、0.9 mg/L 3个小接触组患龋率（χ2＝0.669，P＞0.05）、龋均（F＝0.143，F＜F0.05，P＞0.05）、患者龋均（F＝0.095，F＜F0.05，P＞0.05）差异无统计学意义；1.0、1.1 mg/L 2个小接触组患龋率（χ2＝-0.115，P＞0.05）、龋均（F＝0.187，F＜F0.05，P＞0.05）、患者龋均（F＝0.282，F＜F0.05，P＞0.05）差异无统计学意义；3个大接触组患龋率（χ2＝39.056，P＜0.05）、龋均（F＝26.208，F＞F0.05，P＜0.05）、患者龋均（F＝12.390，F＞F0.05，P＜0.05）差异有统计学意义。结论　唐山市小学生龋齿患病率、龋均等指标与饮水氟含量呈负相关关系，适宜水氟浓度因地区不同而不同，该地区适宜水氟浓度为0.7～1.1 mg/L，此浓度既能降低龋病的发生，又不引起氟牙症的流行。

The correlation between primary school pupil dental caries and fluoride content in drinking water

Abstract: Objective This work aimed to explore the correlation between the prevalence of dental caries among pupils in Tangshan City and the fluoride content in drinking water, and to find the appropriate fluoride concentration in drinking water to prevent dental caries. Methods 50 students from each grade of Grade 2 ~ 5 from 12 primary schools were randomly selected for the investigation of dental caries. Dental caries rate, the overall average number of caries and the average caries of each patient were calculated. Students were divided into different groups according to the fluoride content of drinking water. The small contact group was further divided into 10 subgroups of ≤0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 and 1.0, 1.1 and ≥1.1mg/L fluoride, and the big contact group was further divided into three subgroups of 0.3 -0.6, 0.7-0.9, 1.0-1.1 mg/L fluoride. Results For the four small contact groups of ≤0.3, 0.4, 0.5, 0.4 mg/L fluoride, the caries rate (χ2=2.103, P>2.103), and caries (F=0.136, F0.05), the patient caries were (F=0.079, F0.05), and the difference was not significant. For the groups of 0.7, 0.8, 0.9 mg/L, the caries rate (χ2=0.669, P>0.669), caries (F=0.143, F0.05) and the patient caries were (F=0.095, F0.05), and the difference was not significant. For the groups of 1.0, 1.1 mg/L, the caries rate (χ2=0.115, P>0.115), caries (F=0.187, F0.05) and the patient caries were (F=0.282, F0.05), and the difference was not significant. For the three big contact groups, the caries rate (χ2=39.056, P<39.056), caries (F=26.208, F>F0.05, P<0.05), and the caries of patients were (F=12.390, F>F0.05, P<0.05), and the difference was statistically significant. Conclusion For Tangshan pupils, the dental caries prevalenceand the average number were negatively correlated with the fluoride content in drinking water. The appropriate water fluoride concentration should be 0.7 1.1 mg/ L for reducing dental caries and the prevention of dental fluorosis.