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Proceedings Paper

Multiple-pulse irradiation of dental hard tissues at CO2 laser wavelengths
Author(s): Daniel Fried; Richard E. Glena; John D. B. Featherstone; Wolf D. Seka
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Paper Abstract

Surface temperatures were monitored using pulsed photothermal radiometry (PPTR) during multiple pulse carbon dioxide laser irradiation ((lambda) equals 9.3, 9.6, 10.3 and 10.6 micrometers ). Permanent changes in the optical properties (reflectance and absorption) were observed at fluences greater than 2 J/cm2 for dentin and 5 J/cm2 for enamel. The laser irradiation changes the thermal and the optical properties of these tissues, substantially changing the energy deposition for subsequent laser pulses. The temperature response of enamel and dentin and the reflectance of dentin changed considerably with successive laser pulses. After 10 to 50 pulses the surface stabilized and no further changes were noted. Scanning electron micrographs of the laser conditioned surfaces showed large crystals of modified hydroxyapatite (approximately equals 500 nm) devoid of the organic matrix. Presumably, the water and the interwoven biopolymer matrix had been carbonized nd vaporized. Caries inhibition measurements after multiple pulse irradiation of enamel indicate that the stable laser conditioned surface is more resistant to acid dissolution than untreated enamel.

Paper Details

Date Published: 1 May 1995
PDF: 10 pages
Proc. SPIE 2394, Lasers in Dentistry, (1 May 1995); doi: 10.1117/12.207455
Show Author Affiliations
Daniel Fried, Eastman Dental Ctr. (United States)
Richard E. Glena, Eastman Dental Ctr. (United States)
John D. B. Featherstone, Eastman Dental Ctr. (United States)
Wolf D. Seka, Univ. of Rochester (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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