Konttinen M-L, Hanhijarvi H: Fluoride concentrations of the surface enamel of children living in an optimaliy fluoridated community. Scand J Dent Res 1986; 94: 427-35.Abstract -The present sttidy was undertaken in a community, where the tap "water has been optimally fluoridated since f959 (1.0-1.2 ppm). The material consisted of 92 children and adolescents including 30 sibling-couples. The mean age of the participants was H .8 ± 2.45 (SD) yr. 56 children had consunaed fluoridated water all their life, the others only a part of the developmental period of their permanent dentition. Enamel biopsies were taken from 212 permanent teeth and 33 primary teeth by etching the tooth surface for 6 or 30 s. The etch depth was calculated from the mean of dissolved enamel calcium and phospoms. The fluoride concentration in the outermost enamel was almost similar in the teeth of the lifelong residents and the rest of the children. Towards the deeper layers the amount of fluoride decreases depending on its availablity during the development of the enamel. There was no striidng similarity neither in the fluoride concentration nor in the amount of dissolved enamel between the sihlings when compared with the other children. The posteruptive incorporation of fluoride takes place only on the outermost surface of the enamel. The results suggest that in subsurface layers tbe fluoride exposure during tooth formation is the dominating determinant of enamel fluoride concentration.
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