A Survey About How The Percentage Of Dental Fluorosis Among Children Is Influenced By Water-Improving For Defluordation In The Fluorosis Area Through Drinking Water In Anshan

Objective:By understanding the distribution of drinking water fluorosis and the current situation of water-improving and defluoridation projects in Anshan,we can explore the effect of water-improving projects on the water fluoride content and children dental fluorosis prevalence in disease area.By analyzing the effect water-improving and defluoridation projects,it provides a scientific basis for the prevention and control of endemic fluorosis in Anshan.Methods:In this study,we adopted a census method to monitor the operation of water-improving and defluoridation projects and the fluorosis of disease areas in all fluorosis areas in Anshan,including Haicheng City,Taian County,Xiuyan County,Tiedong District,Tiexi District,Qianshan District.According to whether the implementation of water-improving and defluoridation measures and whether to reach the drinking water fluorosis control standards(water fluoride value?1.2mg/L is qualified),divided into four groups including non-water-affected areas,water-qualified area,change Water unqualified ward and non-ward.The fluoride content of drinking water in four groups of ward residents was monitored.At the same time,all the children aged 8-12 years in each group were monitored,and according to the internationally accepted Dean's method,to monitor the prevalence of dental fluorosis.By comparing groups the prevalence of dental fluorosis,we can analyze water-improving and defluoridation projects for analysis of the value of fluoride in drinking water and the prevalence of dental fluorosis.Results:According to statistics,there are 169 fluorosis areas in Anshan,Liaoning Province,of which 100 are in the light area,44 cases of mild disease,25 cases of serious illness,with a population of 167678.Of the 169 fluorosis wards,148 wards have been changed to water with a water change rate of 87.6%Of the 148 fluoride reduction and water diversion projects,there are 113 normal use projects,8 intermittent water supply and 27 decommissioning and disabled sites,with a scrap rate of 18.2%.Among them,the number of waste water reconstruction projects set up in 1980-1989 accounted for 70.4%of the total number of scrapped projects,and 18.5%of those completed in 1990-1999.After the year 1999,the number of scrapped water projects accounted for 11.1%of the total number of scrapped projects,The longer the construction period,the higher the scrap rate.The average fluorine content of drinking water was 1.71±0.83mg/L,and the mean value of fluorine in drinking water was 0.56±0.39mg/L.The fluorine content of drinking water was found to be significantly different from that of drinking water in drinking water.(t=-6.022,P=0.000).Of the 148 water diversion projects,124 were eligible for water after water diversion,with a passing rate of 83.7%,of which 24 were unqualified,accounting for 16.3%.The prevalence of dental fluorosis in children shows that the prevalence of dental fluorosis in children in different areas of Anshan City was significantly different(?~2=220.789,P<0.05).The prevalence of dental fluorosis among children of different ages was statistically significant(?~2=9.800,P<0.05).The older the prevalence,the higher the prevalence.The detection rate of dental fluorosis in children with endemic fluorosis was significantly higher than that in non-endemic area(?~2=29.272,P<0.05).The prevalence of dental fluorosis was significantly higher in children before water-evacuationand the difference was statistically significant(?~2=13.831,P<0.05).The mean t-test results of water fluorine concentration(t=29.352,P=0.000)showed a significant difference between the water and fluorine values before and after the change of water.The prevalence of dental fluorosis was significantly higher in the ward than in the normal water group and the difference was statistically significant(?~2=18.094,P<0.05).The prevalence of dental fluorosis was significantly higher in children with unopened water-deficient areas than those in water-modified areas(?~2=7.157,P<0.05).The prevalence of dental fluorosis in children without water-deficient area was significantly higher than that in water-unqualified areas(?~2=4.10,P<0.05).The prevalence of dental fluorosis in children with fluoride-contaminated toothpaste in villages with different water fluoride concentrations was greater than that of children with non-fluorinated toothpaste.The prevalence of fluoride toothpaste in high-fluoride water group was significantly different from that of non-fluoride toothpaste(?~2=7.072,P<0.05),while the prevalence of dental fluorosis in low fluoride water group No significant difference(?~2=7.072,P>0.05).Conclusion:1.The implementation of measures about water-improving and defluoridation projects in Anshan is effective for prevention and treatment.2.With the continuous scrapping and deactivation of the water treatment project,the value of water fluorine has recovered,and the residents'health has been threatened by endemic fluorosis,and the prevalence of dental fluorosis has increased.