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Proceedings Paper

Changes in acid resistance of dentin irradiated by a CW 10.6 um CO2 laser
Author(s): John D. B. Featherstone; Charles Q. Le; Dennis Hsu; Saman Manesh; Daniel Fried
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Paper Abstract

The overall objective of our studies is to establish laser conditions that can be used clinically for the prevention or treatment of early carious lesions in dental enamel and dentin. Previous studies have shown that laser irradiation of dental enamel by specific carbon dioxide laser conditions can inhibit subsequent acid dissolution of the dental enamel surface. The purpose of this study was to determine whether irradiation of dentin by a continuous wave 10.6 µm carbon dioxide laser would inhibit acid dissolution. Blocks of human dentin roots (3x3 mm2) were irradiated at 10.6 µm wavelength with power settings of 0.5, 0.75, 1.0, 1.5 and 2.0 watts. A motion controller system was used to ensure uniform irradiation of the entire dentin surface. Surface acid dissolution profiles following irradiation were acquired for the irradiated groups and a non-irradiated control group. Dissolution rates for 0.5 and 0.75 watts were not statistically significant (p>0.05) from the control group, whereas irradiation at 1.0 watts and higher significantly (p<0.05) increased the acid dissolution rate. Considerable surface damage occurred at these higher powers. This study demonstrated that irradiation of dentin by a continuous wave 10.6 µm carbon dioxide but did not decrease the acid dissolution rate, and was detrimental at powers of 1.0 watts and above.

Paper Details

Date Published: 18 February 2008
PDF: 5 pages
Proc. SPIE 6843, Lasers in Dentistry XIV, 684305 (18 February 2008); doi: 10.1117/12.778795
Show Author Affiliations
John D. B. Featherstone, Univ. of California/San Francisco (United States)
Charles Q. Le, Univ. of California/San Francisco (United States)
Dennis Hsu, Univ. of California/San Francisco (United States)
Saman Manesh, Univ. of California/San Francisco (United States)
Daniel Fried, Univ. of California/San Francisco (United States)

Published in SPIE Proceedings Vol. 6843:
Lasers in Dentistry XIV
Peter Rechmann; Daniel Fried, Editor(s)

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