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Proceedings Paper

Depth profile analysis of the chemical and morphological changes in CO2-laser-irradiated dental enamel
Author(s): Michael J. Zuerlein; Daniel Fried; John D. B. Featherstone
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Paper Abstract

Previous studies have shown that IR irradiation of dental enamel at specific wavelengths results in chemical changes in the mineral phase that reduce the progression of sub- surface caries-like lesions. The inhibition of lesion progression has been correlated to the decomposition of carbonate in the irradiated enamel mineral. The present study investigated loss of the carbonate component as a function of depth with 1 micrometers resolution by measuring the strength of the spectrum in the region of the carbonate absorption bands near 1400 cm-1. Bovine enamel samples were laser treated at λ=9.6 μm with a pulse duration of either 2 μs or 100 μs and at λ=10.6 μm with a pluse duration of 2 μs. The depth of treatment was compared with numerical simulation of the temperature rise in enamel due to laser heating. The temperature rise needed to initiate carbonate loss was 400° C, but complete carbonate loss did not occur until surface temperatures were reached which exceeded the melting temperature (800-1200 °C). The depth of the treatment varied depending upon the absorption coefficient, pulse duration, and fluence of the laser irradiation.

Paper Details

Date Published: 19 May 1999
PDF: 7 pages
Proc. SPIE 3593, Lasers in Dentistry V, (19 May 1999); doi: 10.1117/12.348350
Show Author Affiliations
Michael J. Zuerlein, 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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