Objective To understand the schedule and effectiveness of water-improving defluoridation projects comprehensively in control of fluorosis in drinking-water-borne endemic fluorosis areas in Shaanxi Province,and to provide a scientific basis for making strategies in prevention and control the disease for the next step.Methods The progress of drinking-water-borne endemic fluorosis water-improving defluoridation projects and operation condition were investigated in Shaanxi (fluoride content of drinking water was greater than 1.2 mg/L in the endemic areas) in 2014,and children aged 8 to 12 in 32 epidemic villages of six counties including Jingbian,Dingbian,Dali,Jingyang,Qian and Liquan were selected to survey dental fluorosis.Results In Shaanxi Province,the number of villages with water fluorine content of more than 1.2 mg/L was 5 005 and water improvement rate was 83.42％ (4 175/5 005),water-improving projects operated normally rate was 85.05％ (3 551/4 175),and scraped was 37,accounted for 0.89％ (37/4 175).There were 830 epidemic villages without water-improving projects in Shaanxi Province,and high fluoride exposed population was 579 400,mainly distributed in Yulin,Xianyang,Weinan and Yan'an cities.A total of 1 849 children aged 8 to 12 in the 6 counties were examined,the detection rate of dental fluorosis was 56.57％ (1 046/1 849),the index of dental fluorosis was 1.11.Conclusion In drinking-water-borne fluorosis epidemic areas of Shaanxi,the improved-water rate is generally high,and the normal operation of waterimproving projects is overall good,but the measures for water-improving defluoridation must be reinforced and improved.%目的 了解陕西省饮水型地方性氟中毒病区的改水进度、降氟工程运行情况及防治效果,为下一步制订防治策略提供科学依据.方法 2014年调查陕西省所有饮水氟含量＞ 1.2 mg/L病区村的改水降氟工程进度及运行状况;抽取定边、靖边、大荔、泾阳、乾县、礼泉6个县的32个病区村,调查8～ 12岁儿童氟斑牙患病情况.结果 陕西省饮水氟含量＞ 1.2 mg/L的病区村有5 005个,改水村有4 175个,改水率为83.42％(4 175/5005);改水工程正常运转率为85.05％(3 551/4 175);报废工程37个,占0.89％(37/4175).陕西省还有830个病区村尚未改水,高氟暴露人口数57.94万,主要分布在榆林、咸阳、渭南和延安市.在6个县抽查1 849名8～12岁儿童,氟斑牙检出率为56.57％(1 046/1 849),氟斑牙指数为1.11.结论 陕西省饮水型氟中毒病区改水率总体较高,改水工程正常运转总体较好,但病区改水降氟防治措施需进一步加强和完善.
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