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Journal of Biomedical Optics

Infrared radiometry of dental enamel during Er:YAG and Er:YSGG laser irradiation
Author(s): Daniel Fried; Steven R. Visuri; John D. B. Featherstone; Joseph T. Walsh; Wolf D. Seka; Richard E. Glena; Sandra M. McCormack; Harvey A. Wigdor
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Paper Abstract

Time-resolved infrared (IR) radiometry was used to measure surface temperatures during pulsed Er:YSGG(l=2.79 mm) and Er:YAG (l=2.94 mm) laser irradiation of dental enamel. Scanning electron microscopy (SEM)was used to determine the melting and vaporization thresholds and to characterize other changes in thesurface morphology. The magnitude and temporal evolution of the surface temperature during multiplepulse irradiation of the tissue was dependent on the wavelength, fluence, and pre-exposure to laser pulses. Radiometry and SEM micrographs indicate that ablation is initiated at temperatures well below the melting and vaporization temperatures of the carbonated hydroxyapatite mineral component (1200 °C). Ablation occurred at lower surface temperatures and at lower fluences for Er:YAG than for Er:YSGG laser irradiation: 400 °C vs. 800 °C and above 7 J/cm2 vs. 18 J/cm2, respectively. However, the measured surface temperatures were higher at l=2.79 mm than at l=2.94 mm during low fluence irradiation (<7 J/cm2). Spatially dependent absorption in the enamel matrix is proposed to explain this apparent contradiction.

Paper Details

Date Published: 1 October 1996
PDF: 11 pages
J. Biomed. Opt. 1(4) doi: 10.1117/12.250668
Published in: Journal of Biomedical Optics Volume 1, Issue 4
Show Author Affiliations
Daniel Fried, Univ. of California/San Francisco (United States)
Steven R. Visuri, Lawrence Livermore National Lab. (United States)
John D. B. Featherstone, Univ. of California/San Francisco (United States)
Joseph T. Walsh, Northwestern Univ. (United States)
Wolf D. Seka, Univ. of Rochester (United States)
Richard E. Glena, Eastman Dental Ctr. (United States)
Sandra M. McCormack, Eastman Dental Ctr. (United States)
Harvey A. Wigdor, Ravenswood Hospital Medical Ctr. and Wenske Laser Ctr. (United States)

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