Investigation on Water Fluoride of Water-improvement Projects and the Prevalence of Endemic Fluorosis in Shouguang City from 2006 to 2007

[Objective]To understand the current status of endemic fluorosis in Shouguang City and to provide evidence for disease control and prevention in the future.[Methods]Water fluoride and the prevalence of fluorosis were investigated in Shouguang City from June,2006 to August,2007.[Results]A total of 554 water-improvement projects were investigated.Among them,66.96% of the projects have been used for over 15 years.The content of water fluoride was 0.14-3.67 mg/L.136 drinking water sources(24.55%) contained high fluoride content(1 mg/L),distributed in 7 towns/streets covering 122 195 residents,including 40 middle-endemic districts and 96 low-endemic districts.In the villages using water sources with fluoride content ≥1.6 mg/L,1 982 children among 4 500 investigated children(44.04%) were identified as suffering dental fluorosis,including 577 extremely mild,980 mild,302 intermediate,and 123 serious cases.The index of dental fluorosis was 0.92.36 802 residents aged 16 years and over in 5 high fluoride towns were examined for bone fluorosis.700 subjects were determined as bone fluorosis patients(mild) with the prevalence rate of 1.90%.[Conclusion]There are considerable water-improvement and defluoridation projects in Shouguang containing high fluoride content.The dental fluorosis and bone fluorosis are still damaging the health of population.