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Journal of Dental Research
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Composition of Fluoridated Dental Enamel Studied by X-ray Photoelectron Spectroscopy (ESCA)

David M. Hercules

Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA

Norman L. Craig

Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA

Enamel surfaces that had been treated with an acid phosphate-fluoride gel were analyzed for phosphorus, calcium, fluorine, and carbon using X-ray photoelectron spectroscopy. This technique revealed a heavy carbon coating on the enamel that overlays a surface composed of a 1:2 ratio of calcium to fluorine. Evidence is presented for a noncaL cium phosphorus species in the surface layer. Removal of successive layers of enamel by argon-ion etching showed a steady decrease in fluorine and a corresponding increase in phosphorus concentrations.

Journal of Dental Research, Vol. 55, No. 5, 829-835 (1976)
DOI: 10.1177/00220345760550051901
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