Analysis of prevalence of drinking water endemic fluorosis in Shanxi Province in 2011

Objective To explore the current prevalence of drinking water endemic fluorosis in Shanxi Province,to provide scientific evidence for prevention and control.Methods According to The National Technical Scheme for Drinking Water Endemic Fluorosis Control in 2010,6 counties of endemic area were randomly selected as monitoring sites.10 water-improvement projects from each monitoring sites were taken at random to monitor operation of the water-improvement project.Out of the collected 3 villages from each monitoring sites,the village without water-improvement was detected for fluoride content in drinking water,while at the villages with water-improvement,operation of defluoridation projects was investigated and water fluoride was determined.All children at age from 8 to 12 at each village were checked for dental fluorosis with Dean method.Reslts Totally 60 water-improvment projects were investigated.There were 46 projects of qualified water fluorine with qualified rate of 76.67%.And 17 villages with improved water were surveyed,11 were qualified with the qualified rate of 64.71%;1 village was without improved water project with mean water fluorine concentration of 2.28 mg/L.1 409 children at age from 8 to 12 at the water-improvement villages were detected for dental fluorosis with the detection rate of 31% and detection rate of defected dental fluorosis of 5%,and the dental fluorosis index of 0.7.At the village without water-improvement,77 children at age from 8 to 12 were checked for dental fluorosis with the detection rate of 29%,and the dental fluorosis index of 0.5.Conclusions Prevalence of children's dental fluorosis is stable in Shanxi Province.Water fluorine content in part of the water-improvement projects is over the standard.Therefore,water-improvement projects should be strengthened to ensure the effectiveness of the control and prevention.