Effect evaluation of the defluoridation projects in preventing children's dental fluorosis in 134 Regiment, 8 Division, Xinjiang Production and Construction Corps

Abstract

Objective To investigate the prevalence and trend of dental fluorosis of 7-14 years old children in 134 Regiment, 8 Division, Xinjiang Production and Construction Corps, and to evaluate the effectiveness of water improvement and fluoride control measures. Methods From 2010 to 2017, using cross-sectional survey, six water allocation places were selected from 134 Regiment, 8 Division, Xinjiang Production and Construction Corps, and the fluoride content was determined. Children of 7-14 years old in 2 central primary schools were investigated, and dental fluorosis was examined. Taking 2017 as the benchmark, children born before water improvement were 11-14 years old, children born after water improvement were 7-10 years old. Water fluoride was detected via the ionselective electrode method. of dental fluorosis was based on the standard of Dental Fluorosis Diagnosis (WS/T 208-2011). The detection rate of dental fluorosis was compared by χ2 test, and rank sum test was used to compare the severity of the disease. Results A comprehensive water improvement and fluoride reduction project was completed in 134 Regiment, 8 Division, Xinjiang Production and Construction Corps in 2007. The detection rate of dental fluorosis in children born before water improvement was 2.65 times higher than that of children born after water improvement [14.43% (101/700) vs 5.44% (33/607), χ2 = 28.567, P < 0.01]. The dental fluorosis index of children born before water improvement was also higher than that of children born after water improvement(0.33 vs 0.11). According to age standardization (based on 2017), there was a significant difference in the detection rate of dental fluorosis among children in different years (χ2 = 351.300, P < 0.01). The detection rate of dental fluorosis in children decreased from 35.26% in 2010 to 10.25% in 2017. There was a statistically significant difference in the severity of dental fluorosis in children of different years (H = 954.033, P < 0.01). The dental fluorosis index of children decreased from 0.71 in 2010 to 0.23 in 2017, and the disease changed from extremely mild fluorosis epidemic to non-fluorosis epidemic. Conclusion After effective water improvement in 134 Regiment, 8 Division, Xinjiang Production and Construction Corps, the prevalence of dental fluorosis in children in the disease affected areas has decreased significantly, the effect of defluoridation project is significant. Key words: Fluorosis, dental; Water; Effect evaluation