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Proceedings Paper

Laser hard tissue interactions: energy transmission through human dental tissue using a holmium:YAG laser
Author(s): Wei R. Chen; Raleigh A. Holt; Robert E. Nordquist
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Paper Abstract

Laser energy transmission through hard tissue was investigated using a pulsed Holmium:YAG laser (2.12 micrometers wavelength). The surface of extracted human dental tissue, 200 micrometers to 700 micrometers in thickness, was irradiated by a laser beam of various fluences between 3 J/cm2 to 28 J/cm2. The transmitted energy through different dentinal components of the tooth was measured. For the mature teeth, the region of the dentinoenamel junction showed the least transmission and the coronal the most; the difference between the two regions could be as large as 20%. The unerupted or young teeth revealed the opposite transmission characteristics. Repeated laser treatment revealed an enhanced transmissibility and the transmitted energy reached a plateau after certain irradiation exposure. Also studied were the effects of various media on the dental transmissibility. For example, surface application of a smear layer of unfilled resin did not change the transmissibility but appeared to slow down the temperature build-up. Visible surface damage -- a yellow or a white spot on the treatment site -- appeared when the fluence reached beyond 20 J/cm2. SEM samples revealed three different surface structural changes: melting with tubule closures, surface removal with tubule exposures, and surface cracking with crater formation, depending on the level of irradiation.

Paper Details

Date Published: 1 May 1995
PDF: 10 pages
Proc. SPIE 2394, Lasers in Dentistry, (1 May 1995); doi: 10.1117/12.207458
Show Author Affiliations
Wei R. Chen, Oklahoma School of Science and Mathematics (United States)
Univ. of Oklahoma (United States)
Raleigh A. Holt, Univ. of Oklahoma College of Dentistry (United States)
Robert E. Nordquist, Dean A. McGee Eye Institute/Univ. of Oklahoma (United States)

Published in SPIE Proceedings Vol. 2394:
Lasers in Dentistry
Harvey A. Wigdor; John D. B. Featherstone; Joel M. White, Editor(s)

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