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Proceedings Paper

Comparison of three lasers on demineralization of human enamel
Author(s): G. Lynn Powell; Duncan Yu; William I. Higuchi; Jeffrey L. Fox
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Paper Abstract

Previous studies have recorded the reduction of caries-like lesions or demineralization in extracted human teeth that had been irradiated with CO2 laser, Nd:YAG laser, and Argon laser. This study was conducted to evaluate the effects of three different cw lasers on acid resistance and demineralization of dental enamel. Human enamel was laser irradiated with either Argon, CO2, or Nd:YAG energy densities of 60 - 65 J/cm2 or 120 - 130 J/cm2. The amount of demineralization was determined in a rotating disk assembly (0.1 M acetate buffer, pH - 4.5) for 24 hours and the results determined and plotted against the non-lased control using microradiographs and computerized imaging. The amount of dissolution of tooth structure lost to demineralization in 4.5 pH acid bath in a 24 hour period was reduced from approximately 140 microns for the unlased control to approximately 90 microns for the Argon laser and 70 microns for the CO2 laser at 60 - 65 J/cm2. At 120 - 130 J/cm2 the results were: 120 microns for the Nd:YAG, 70 microns for the Argon, and 45 microns for the CO2 laser. This study shows that demineralization is reduced significantly in vitro when human enamel is exposed to Argon and CO2 laser irradiation.

Paper Details

Date Published: 21 July 1993
PDF: 5 pages
Proc. SPIE 1880, Lasers in Orthopedic, Dental, and Veterinary Medicine II, (21 July 1993);
Show Author Affiliations
G. Lynn Powell, Univ. of Utah (United States)
Duncan Yu, Univ. of Utah (United States)
William I. Higuchi, Univ. of Utah (United States)
Jeffrey L. Fox, Univ. of Utah (United States)

Published in SPIE Proceedings Vol. 1880:
Lasers in Orthopedic, Dental, and Veterinary Medicine II
Dov Gal D.V.M.; Stephen J. O'Brien M.D.; C. T. Vangsness M.D.; Joel M. White D.D.S.; Harvey A. Wigdor D.D.S., Editor(s)

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