Preventive efficacy of dental fluorosis among 8-12 school-age children in Qingtongxia

Objective To evaluate the results of water improvement project aimed in eliminating the prevalence of dental fluorosis in endemic fluorosis areas of Qingtongxia City.Methods By using epidemiological sample survey methods,670 children(8-12 years) had been examined in dental fluorosis in Yesheng 5th team Yesheng Township,where endemic fluorosis was seriously prevailed and had become water-improvement area in 2006;Daba township,where endemic fluorosis mild prevailed;and Huashigou 5th team,which was not included in water-improvement area.And according to the degree of disease classification indexing,prevalence rate was calculated.Results There was evident differences of the dental fluorosis in water-improvement areas and the place was not in the water-improvement Projects areas(χ2=5.012,20.676,P0.05).There was significant correlation between water fluorine concentration and Children's dental fluorosis clinical dividing(r=0.638,P0.05).The fluoride content in drinking water was(0.24±0.05)mg/L and(0.32±0.07)mg/L in the two water-improvement teams,which met the national standard.Conclusion After Water-improvement Projects in the endemic fluorosis areas of Qingtongxia City.Drinking water conform to the hygiene requirement.The dental fluorosis are still damaging the health of population.