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Proceedings Paper

Bacterial reduction and dentin microhardness after treatment by a pulsed fiber optic delivered Nd:YAG laser
Author(s): Harold E. Goodis; Joel M. White; Sally J. Marshall; Grayson W. Marshall
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Paper Abstract

The purpose of this study was to determine the microhardness and extent of bacterial reduction of contaminated dentin following pulsed fiber optic delivered Nd:YAG laser exposure. Knoop hardness was determined before and after laser exposures from 0.3 to 3.0 W and repetition rates of 10 to 30 Hz. Half the sections were covered with an organic black pigment before laser exposure to evaluate the use of the pigment as an initiator to increase laser absorbance on the surface. Repeated measures design was employed to determine the microhardness of cut and polished dentin sections. Additional dentin sections were sterilized by gamma irradiation and then inoculated with B. subtilis, E. coli or B. stearothermophilus. The contaminated sections were exposed to contact delivered Nd:YAG laser. Cultures were obtained from the dentin surfaces and the colony forming units counted. Increased microhardness was found for all laser treatments above the physical modification. Bacterial reduction was obtained but complete sterilization was not.

Paper Details

Date Published: 7 September 1994
PDF: 8 pages
Proc. SPIE 2128, Laser Surgery: Advanced Characterization, Therapeutics, and Systems IV, (7 September 1994); doi: 10.1117/12.184928
Show Author Affiliations
Harold E. Goodis, Univ. of California/San Francisco School of Dentistry (United States)
Joel M. White, Univ. of California/San Francisco School of Dentistry (United States)
Sally J. Marshall, Univ. of California/San Francisco School of Dentistry (United States)
Grayson W. Marshall, Univ. of California/San Francisco School of Dentistry (United States)


Published in SPIE Proceedings Vol. 2128:
Laser Surgery: Advanced Characterization, Therapeutics, and Systems IV
R. Rox Anderson; R. Rox Anderson, Editor(s)

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