Objective To master the
prevalence of
drinking-
water-borne endemic fluorosis of
children in the
disease affected areas of Liaoning Province and to understand the effect of
water improvement
measures in prevention and control of fluorosis.
Methods The data of 18
water improvement
projects in
drinking-
water-borne endemic fluorosis areas of Liaoning Province from 2011 to 2016 were collected by retrospective
method,and the data of
dental fluorosis in
children aged 8 to 12 years old were analyzed.The
prevalence and
detection rate of dental flaorosis in
children aged 8 to 12 years old were analyzed.To compare the
incidence of
dental fluorosis among
children from villages with qualified
water fluoride and those from villages with unqualified
water fluoride.Results From 2011 to 2016,in the annual
survey of 18
water engineering projects in 18 monitored villages,normal operating rate was between 94.44% (17/18)-100.00% (18/18),
water fluoride qualified rate was between 88.89% (16/18)-100.00% (18/18).In the monitored village,4 941
children aged 8 to 12 were examined,and the
detection rate of
dental fluorosis was 9.8% (484/4 941).The
dental fluorosis index was 0.19.The
detection rate (14.0%,10.7%,10.7%,8.7%,6.6%,8.1%) of
dental fluorosis was decreasing year by year (x2trend =24.3,P < 0.05).The total
detection rate of
children's
dental fluorosis in monitored villages (8.1%,356/4 422) with normal operation of
water improvement
projects and qualified
water fluoride was lower than that in monitored villages with excessive
water fluoride (24.7%,128/519,x2 =145.1,P < 0.05).Conclusion After
water improvement
measures are implemented in
drinking water fluorosis areas of Liaoning Province,the
dental fluorosis of
children in the affected areas is effectively controlled,but the problem of excessive
fluoride in
water improvement
projects still exists,and the management of
water improvement
projects should be strengthened in the
future.