title: [Fluoride ions and apatite recrystallization of apatite in enamel].
abstract: The authors discuss the basic process on which the principle of fluoridation in based--i.e. the mutual exchange of F- ions and the OH- group in hydroxyapatite of enamel. Model investigations assessing the energy difference between hydroxyapatite and F- and fluorapatite and the OH- group indicate that fluorapatite tends to release steadily fluoride ions and to change into hydroxyapatite. This tendency, apparently inopportune from the aspects of caries prevention, ensures, however, a permanent low F- level above the enamel surface. The presence of F- ions facilitates recrystalization of apatite in the initial caries stage. The investigation tries to throw new light, from the point of view of theoretical chemistry at a molecular level, on the mechanism of remineralization, one of the most important ways which implements the preventive action of fluoride.
authors.forename: O
authors.initials: O
authors.lastname: Brázda
authors.forename: R
authors.initials: R
authors.lastname: Zahradník
mesh_terms: D003460:Crystallization; D003743:Dental Enamel / Q000378:metabolism*; D005459:Fluorides / Q000493:pharmacokinetics*; D006882:Hydroxyapatites / Q000378:metabolism; D007477:Ions; D014089:Tooth Remineralization
chemical_list: D006882:Hydroxyapatites; D007477:Ions; D005459:Fluorides
vernacular_title: Fluoridové ionty a rekrystalizace apatitu ve sklovinĕ.