Relationship between the Granitoid Distribution and Fluoride Level in Drinking Water

DOI Web Site 1 Citations 20 References
  • HARESAKU Satoru
    Non-profit Japanese Conference on the Promotion of the Use of Fluoride in Caries Prevention:Preventive & Public Health Dentistry, Department of Public Health & Human Sciences, Fukuoka Dental College
  • AIDA Jun
    Non-profit Japanese Conference on the Promotion of the Use of Fluoride in Caries Prevention:Division of International and Community Oral Health, Department of Oral Health and Development, Tohoku University Graduated School:Department of Epidemiology and Public Health, University College London
  • OISHI Kenichi
    Non-profit Japanese Conference on the Promotion of the Use of Fluoride in Caries Prevention:The Dental Clinic of Toyodai
  • OISHI Emiko
    The Dental Clinic of Toyodai
  • TAURA Katsuhiko
    Non-profit Japanese Conference on the Promotion of the Use of Fluoride in Caries Prevention:Division of Preventive Dentistry, Department of Oral Health Enhancement, Tohoku University Hospital
  • TSUTSUI Akihito
    Non-profit Japanese Conference on the Promotion of the Use of Fluoride in Caries Prevention:Preventive & Public Health Dentistry, Department of Public Health & Human Sciences, Fukuoka Dental College
  • KUROSE Mayumi
    Non-profit Japanese Conference on the Promotion of the Use of Fluoride in Caries Prevention:PMJ Dental Clinic
  • SAKAI Osamu
    Non-profit Japanese Conference on the Promotion of the Use of Fluoride in Caries Prevention

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Other Title
  • 日本国内における花崗岩地質の分布と水道水中フッ化物イオン濃度の関係
  • ニホン コクナイ ニ オケル カコウガン チシツ ノ ブンプ ト スイドウ スイチュウ フッカブツ イオン ノウド ノ カンケイ

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Granitoids contain higher levels of fluoride than other rocks. This may affect the fluoride level in drinking water. A previous study showed that fluoride levels of more than 0.3mg/L in drinking water may contribute to caries prevention. From the viewpoint of caries prevention, we selected water plants providing public water with a fluoride level of more than 0.3mg/L (group A) and investigated the geographical distribution. The number of water plants in group A was 94, equivalent to 1.7% of the total water plants in Japan. Many of the plants are situated in the western part of Japan, similarly to the granite distribution: Ehime, Hyogo, and Hiroshima Prefectures. Then, for a comparison with group A, we randomly selected 100 water plants providing public water with a fluoride level below 0.3mg/L (group B) in 25 prefectures within which group A plants were situated. We plotted the positions of group A and B plants on the Japanese granitoid distribution map, and investigated the geographic relationship between these water plants and the granitoid distribution. About 96% of group A situated within granitoid distribution sites, with the percentage of group A plants being significantly higer in such areas. These results suggest that water plants providing public water with a fluoride level above 0.3mg/L are unevenly distributed in the western part of Japan similarly to the granitoid distribution, and the high levels of fluoride in granitoids may effect the fluoride level in drinking water.

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