Analysis on results of national endemic fluorosis surveillance in Tian county Gansu province in 2000,2001

Objective To understand the using state of water improvement to reduce fluoride project and effect of reducing fluoride in drinking-water type fluorosis areas in order to direct the prevention of endemic fluorosis in Gansu province.Methods The dental fluorosis of children was examined with Dean's index and skeletal fluorosis diagnosed with X-ray. Fluoride contents in drinking water and urine were determined with FSIE.Results The detectable rates of the dental fluorosis were 35.3% in 2000 and 39.9% in 2001; the rate of skeletal fluorosis was 24% in 2001. About 60% of water improvement project could not normally be run in 2000,2001.Conclusions Effect of water improvement to reduce fluoride and prevent disease is obvious, but ill management and maintenance affect the effect.