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Proceedings Paper

Lack of dentin acid resistance following 9.3 um CO2 laser irradiation
Author(s): Charles Q. Le; Daniel Fried; John D. B. Featherstone
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Paper Abstract

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 similar carbon dioxide laser conditions would have a protective effect on dentin. Blocks of human dentin roots (3x3 mm2) were irradiated at 9.3 µm wavelength with a 15-18 µs pulse duration laser and fluences of 0.50-1.50 J/cm2. 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 five study groups, control group (Non-irradiated) and four laser-treated groups. Dissolution profiles of low fluence groups (0.50 and 0.75 J/cm2) exhibited similar profiles to the control group. Dissolution profiles of higher fluence groups (1.0 and 1.5 J/cm2) showed an increased dissolution rate over the control group, but these differences were not statistically significant (p>0.05). This study demonstrated that the application of carbon dioxide laser irradiation significantly alters the surface of dentin but did not decrease the acid dissolution rate.

Paper Details

Date Published: 11 February 2008
PDF: 5 pages
Proc. SPIE 6843, Lasers in Dentistry XIV, 68430J (11 February 2008); doi: 10.1117/12.778801
Show Author Affiliations
Charles Q. Le, 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. 6843:
Lasers in Dentistry XIV
Peter Rechmann; Daniel Fried, Editor(s)

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