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Proceedings Paper

Midinfrared ablation of dentin with the Vanderbilt FEL
Author(s): David M. Harris; Lou Reinisch; Glenn S. Edwards; Michael J. Yessik; Shahid Ashrafi; Joseph Santos-Sacchi
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Paper Abstract

Absorption spectra of 0.1 - 0.2 mm thick, dehydrated sections of human teeth were measured in the transmission mode with a Bruker FT-IR spectrometer from 2.5 - 20 micrometers . Absorption peaks for amide I, II and III, carbonate and phosphate were identified. Craters were ablated in dentin and enamel using a tunable FEL at 6.45 micrometers at various fluences. Pulse duration: 3 microsecond(s) ; spot size (Gaussian, FWHM): 300 micrometers ; repetition rate: 10 Hz. Crater depth and width were measured from digitized optical images. Ablation rates were computed from crater depth and volume data. Selected specimens were examined with scanning electron microscopy to determine ablation surface characteristics. Depth of thermal damage and dentinal tubule morphology were estimated from SEM examination of fractures through ablation sites. Functions describing crater depth vs. number of pulses (quadratic function) were not the same as crater volume vs. number of pulses (linear function). Crater depth decreases with successive pulses, concurrently, the crater width increases. Thus, each pulse removes approximately a constant volume. Material was observed to flow through the dentinal tubules during and after ablation. Patent tubules on crater walls and floor were observed with SEM. Ablation rates in dentin were approximately 3X those in enamel at 6.45 micrometers . Ablation rates and surface characteristics varied across wavelengths from 5.8 to 8.0 micrometers .

Paper Details

Date Published: 23 April 1996
PDF: 11 pages
Proc. SPIE 2672, Lasers in Dentistry II, (23 April 1996); doi: 10.1117/12.238765
Show Author Affiliations
David M. Harris, Univ. of Illinois/Chicago and Yale Univ. School of Medicine (United States)
Lou Reinisch, FEL Ctr./Vanderbilt Univ. (United States)
Glenn S. Edwards, FEL Ctr./Vanderbilt Univ. (United States)
Michael J. Yessik, American Dental Technologies, Inc. (United States)
Shahid Ashrafi, Univ. of Illinois/Chicago (United States)
Joseph Santos-Sacchi, Yale Univ. School of Medicine (United States)

Published in SPIE Proceedings Vol. 2672:
Lasers in Dentistry II
Harvey A. Wigdor D.D.S.; John D. B. Featherstone; Joel M. White D.D.S.; Joseph Neev, Editor(s)

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