Fluorine and Tin Uptake by Enamel Studied by X-Ray Photoelectron Spectroscopy (ESCA)

Abstract

ESCA has been combined with argon-ion etching to obtain depth profiles for SnF₂treated enamel. Three zones of products from the topical treatment are detected: a layer of tin oxide on the surface; fluoroapatite + hydroxyapatite at depths below about 0.2 micron; an intermediate layer CaF2, Sn(OH) ₂, Sn ₂ PO ₄ OH, and fluoroapatite between the two. Sn₃F₃PO₄ was not detected.

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