Investigation on the correlation between water fluorine content and dental fluorosis and caries of children in Shaanxi Province / 中华地方病学杂志

ABSTRACT

Objective:To investigate the relationship between different fluorine concentrations in drinking water and dental fluorosis and caries of children.Methods:In 2014-2019, 5 cities and 6 counties (districts) were selected, which were Dali and Heyang counties of Weinan City, Liquan County of Xianyang City, Fugu County of Yulin City, Chencang District of Baoji City, and Yanliang District of Xi'an City, villages of different water fluorine contents were selected, 3 tap water samples were collected from each village to detect the water fluoride content. The prevalence of dental fluorosis and caries in children aged 8 to 12 years old in villages was investigated, and children's urinary fluorine level was determined.Results:Totally 48 water samples and 868 urine samples were tested, and the water fluorine content was from 0.23 to 3.70 mg/L, and the urinary fluorine mean was 1.47 mg/L; 1 021 children aged 8-12 years old were examined, 372 were diagnosed with dental fluorosis, the detection rate was 36.43%; 198 with caries, the detection rate was 19.39%. The detection rate of caries in children decreased and then increased with the increase of water fluorine ( F=14.470, P < 0.05), and the detection rate of caries was the lowest when the water fluorine was 1.2-< 2.0 mg/L. The detection rate of dental fluorosis in children increased with the increase of water fluorine ( F=52.215, P < 0.05), when the water fluoride was 1.0-< 1.2 mg/L, the detection rate of children's dental fluorosis was 31.90% (37/116), which was basically within the national control line (30%). Conclusion:The content of water fluoride in 1.0-< 1.2 mg/L, can not only reduce the detection rate of caries, but also control the prevalence of dental fluorosis.