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11 February 2008 Lack of dentin acid resistance following 9.3 um CO2 laser irradiation
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Proceedings Volume 6843, Lasers in Dentistry XIV; 68430J (2008)
Event: SPIE BiOS, 2008, San Jose, California, United States
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.
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Charles Q. Le, Daniel Fried, and John D. B. Featherstone "Lack of dentin acid resistance following 9.3 um CO2 laser irradiation", Proc. SPIE 6843, Lasers in Dentistry XIV, 68430J (11 February 2008);

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