Abstract：Objective To investigate the prevalence of dental fluorosis among children in drinking-water-borne fluorosis areas in Puyang City and to evaluate the effect of water improvement measures so as to provide a basis for implementing water improvement in endemic fluorosis areas. Methods Multi-stage stratified sampling method was used to select villages in drinking-water-borne fluorosis areas according to three levels of water fluoride contents (including 1.2-2.0 mg/L, 2.1-4.0mg/L and ≥4.1mg/L) before water improvement.Three villages with water improvement for ≤5 years, 6-8 years and ≥9 years respectively in each level were randomly selected, so 9 villages were surveyed.In each surveyed village, fluoride content of drinking water and the prevalence of dental fluorosis in children aged 8-12 years before water improvement and in 2015 were surveyed. Results A total of 1,126 children were surveyed in 2015, and the detection rate of dental fluorosis in 2015 was lower than that before water improvement (24.25% vs. 64.10%, χ2=368.448, P<0.001). No statistically significant difference was found in the detection rates of dental fluorosis in the surveyed villages with water improvement for 6-8 years and ≥9 years (16.31% vs. 20.44%, χ2=2.270, P=0.132), but the above-mentioned detection rates were both lower than that of the surveyed villages with water improvement for ≤ 5 years (16.31% vs. 42.69%, 20.44% vs. 42.69%, χ2=49.263, χ2=43.012, both P<0.001). The detection rates of dental fluorosis in males and females in 2015 were 23.54% and 25.21% respectively, showing no statistically significant difference (χ2=0.418, P=0.518). The detection rates of dental fluorosis in the age groups of 8, 9, 10, 11 and 12 years were 18.71%, 19.31%, 29.82%, 24.87% and 35.77% respectively, with statistically significant differences (χ2=16.374, P<0.001). In the surveyed villages with water improvement for ≤ 5 years and 6-8 years, the younger the children, the lower the detection rate of dental fluorosis (χ2trend=18.412, P<0.001, χ2trend=6.294, P=0.012). No statistically significant difference was observed in the detection rate of dental fluorosis among the age groups of the surveyed villages with water improvement for ≥9 years (χ2trend=7.263, P=0.123). The detection rates of dental fluorosis in the age groups of 8, 9, 11 and 12 years were related to the duration of water improvement (all P<0.05). Conclusions Water improvement in drinking-water-borne endemic fluorosis areas in Puyang City is particularly effective. The duration of water improvement has a great influence on the prevalence of dental fluorosis in children, and fluoride content in drinking water improved more than 5 years can reach the control standards for the diseases areas.
王利波, 宋传清, 王兰珍. 濮阳市饮水型地方性氟中毒病区改水效果分析[J]. 实用预防医学, 2018, 25(6): 699-702.
WANG Li-bo, SONG Chuan-qing, WANG Lan-zhen. Effect of water improvement in drinking-water-borne endemic fluorosis areas in Puyang City. , 2018, 25(6): 699-702.
2018, Vol. 25 
