PMID: 3213446Dec 1, 1988Paper

19F MAS-NMR and solution chemical characterization of the reactions of fluoride with hydroxyapatite and powdered enamel

Acta Odontologica Scandinavica
D J WhiteJ P Yesinowski

Abstract

Solution chemical and 19F magic angle spinning-nuclear magnetic resonance (MAS-NMR) methods have been utilized to study the effects of fluoride dose, fluoridating pH, and mineral surface area on the dynamics of fluoride reactivity with hydroxyapatite and powdered human dental enamel in vitro. Both solution chemical fluoride uptake and NMR measurements demonstrated that the reaction products of ionic fluoride with apatite include mixtures of FAP, FHAP, and CaF2, with increased amounts of CaF2 promoted by increased F concentration or decreased pH. NMR analysis showed FAP or FHAP as a reaction product of fluoride uptake under all conditions, regardless of whether CaF2 was formed, unambiguously demonstrating fluorite as an additive rather than substitute form of F reactivity. pH stat measurements demonstrated the release of OH- during F reactivity with apatites corresponding to ion exchange formation of FAP/FHAP or dissolution/reprecipitation formation of CaF2. Phosphate release into solution accompanied fluoride uptake under all conditions, including regions where ion exchange predominated. Whereas powdered dental enamel demonstrated fluoride uptake behavior similar to that of synthetic apatite, the resulting reaction products dif...Continue Reading

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Citations

Jan 1, 1997·Critical Reviews in Oral Biology and Medicine : an Official Publication of the American Association of Oral Biologists·T Aoba
Mar 18, 2017·Chemical Communications : Chem Comm·Hsun-Hui ChangJerry C C Chan
Feb 21, 1998·Advances in Dental Research·H Tsuda, J Arends
Nov 1, 1995·Advances in Dental Research·M Colbert
Apr 1, 1992·Journal of Dental Research·J J ten Bosch, M Booij
Dec 7, 2011·Environmental Science & Technology·Vanessa SternitzkeC Annette Johnson

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