改水后儿童氟斑牙、尿氟变化的调查

为了解和总结广东省改水对地方性氟中毒的防疫效果，从１９９３￣１９９９年对丰顺县的轻病区（大寨村）、中病区（湖陂村）和重病区（安全村）的饮用水氟情况和８￣１２岁儿童氟斑牙率及尿氟、水氟进行了调查。结果显示：安全村改水后饮水氟含量稳定在１．０ｍｇ／Ｌ以下，８￣１２岁儿童氟斑牙检出率、中度以上氟斑牙检出率及氟斑牙指数呈逐年下降的的趋势，尿氟含量也保持在正常范围之内。相反，改水后湖陂、大寨２村的饮水氟很不

Survey on children's dental fluorosis and fluoride content in urine after defluoridation to improve drinking water

The authors surveyed the dental fluorosis and fluoride content in urine of 8- 12 years old children's in 1993 to 1999for the evaluation of the efficiency to preventendemic fluorosis afterdefluoridation to change drinking water source in Guangdong Province.Three villages:slight fluorosis area in Dazhai village,middle fluorois area in Hupi village and severe fluorosis area in Anquan village in Fengshun County were surveyed.The results showed that the fluoride contents in drinking water were1mg/ L(or less) in Anquan village,at the same time the prevalence of dental fluorosis and indexes of dental fluorosis were decreasing as changing water time.Fluoride contents in urine were normal.But in other two villages,the fluoride contents in drinking water exceeded 1mg/ L ,therefore the children's prevalence rates and indexes of dental fluorosis were higher than the national standards.It is important to keep fluoride contents in drinking water under 1mg/ L for preventing endem ic fluorosis by defluoridation to im prove drinking water.