Investigation on endemic fluorosis distribution in Liaoning province

  Objective   To understand the type, distribution and epidemic charateristics as well as relating factors of endemic fluorosis in Liaoning province.

  Methods   To combine general survey and sampling randomly.

  Results   The endemic fluorosis in Liaoning province is mainly drinking water type.Its distribution is wide and severe.There are 645 387 patients suffering from dental fluorosis, 45 078 paeients suffering from skeletal fluorosis in 2 705 villages of 49 counties of 13 cities.The type of fluorosis area is complicated including mountainous type, plain type, coastal region type, hot spring type and basin type.

  Conclusion   Rich fluoride environment is the main reason for forming the fluorosis area.According to the special geographic environment and economical factors, adopting comprehensive control and removal of flour from water are the main measures to prevent endemic fluorosis in Liaoning province.