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Proceedings Paper

Laser-induced transformation of carbonated apatite to fluorapatite on bovine enamel
Author(s): Nancy D. Phan; Daniel Fried; John D. B. Featherstone
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Paper Abstract

Previous studies have shown that irradiation of dental enamel by carbon dioxide (CO2) laser irradiation, with and without fluoride, can inhibit the acid-induced surface dissolution of the carbonated apatite (CAP) mineral of the tooth. The aim of the present study was to test the hypothesis that laser treatment together with fluoride (F) can effectively transform the CAP in caries-like lesions to fluorapatite (FAP), which is orders of magnitude less soluble than CAP. Samples of both sound and caries-like enamel were irradiated by CO2 laser at 9.6 μm , 25 pulses per spot, 2 μs pulse duration and 1J/cm2 fluence, with and without F treatment. The surface acid-dissolution rate was measured, together with untreated controls in a specially constructed apparatus. FAP formation was assessed by chemical analysis. Results showed dissolution rate reductions of 49%, 73%, and 87% for fluoride treatment, laser alone, and the laser/F combination respectively. Carbonate loss (measured by FTIR) coincided with dissolution rate reduction. High F concentrations were incorporated into the laser treated samples, producing marked dissolution rate reductions, most likely related to the formation of FAP.

Paper Details

Date Published: 19 May 1999
PDF: 8 pages
Proc. SPIE 3593, Lasers in Dentistry V, (19 May 1999); doi: 10.1117/12.348355
Show Author Affiliations
Nancy D. Phan, Univ. of California/San Francisco (United States)
Daniel Fried, Univ. of California/San Francisco (United States)
John D. B. Featherstone, Univ. of California/San Francisco (United States)

Published in SPIE Proceedings Vol. 3593:
Lasers in Dentistry V
John D. B. Featherstone; Peter Rechmann D.D.S.; Daniel Fried, Editor(s)

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