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Proceedings Paper

Surface dissolution kinetics of dental hard tissue irradiated over a fluence range of 1 to 8 J/cm2
Author(s): John D. B. Featherstone; Daniel Fried; Clifford W. Duhn
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Paper Abstract

Previous studies have demonstrated that carbon dioxide (CO2) laser treatment of dental enamel can inhibit subsequent sub-surface caries-like progression. Irradiation of dental enamel by specific wavelengths and fluences of CO2 laser light alters the chemical composition of the crystals, decomposing the carbonate component. The present study examined the effects of fluence and number of pulses on the surface dissolution kinetics of dental enamel following laser irradiation of the surface. The initial dissolution rate of dental enamel (5 by 5 mm blocks) in pH 4.5 acetate buffer was determined after laser irradiation by a pulsed CO2 laser at 9.3 micrometer, with a pulse duration of 100 microseconds, and 0-25 pulses per spot, with fluences of 0-8 J/cm2. Maximum inhibition of dissolution occurred at fluences of 3-5 J/cm2 coinciding with maximum carbonate loss, but the beneficial effect was negated at higher fluences as the surface chemistry changed. Irradiation by more than 5 pulses produced minimal further benefit.

Paper Details

Date Published: 22 April 1998
PDF: 6 pages
Proc. SPIE 3248, Lasers in Dentistry IV, (22 April 1998); doi: 10.1117/12.306020
Show Author Affiliations
John D. B. Featherstone, Univ. of California/San Francisco (United States)
Daniel Fried, Univ. of California/San Francisco (United States)
Clifford W. Duhn, Univ. of California/San Francisco (United States)

Published in SPIE Proceedings Vol. 3248:
Lasers in Dentistry IV
John D. B. Featherstone; Peter Rechmann; Daniel Fried, Editor(s)

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