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Proceedings Paper

Spectroscopic comparison of the effects of CO2, Nd:YAG, and water-cooled Nd:YAG on tooth root
Author(s): Paulette Spencer; Charles M. Cobb; Mark H. McCollum; David M. Wieliczka
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Paper Abstract

This in vitro investigation characterized the chemical structure of lased root surfaces using FTIR photoacoustic spectroscopy. Twelve disks, 6 X 2 mm, were cut from debrided root surfaces of extracted, unerupted human molars. Each specimen was exposed to either the CO2 Nd:YAG or water cooled Nd:YAG laser at these energy densities: CO2, 275; Nd:YAG without water 571; Nd:YAG with water 571 and 1429 J/cm2. Spectra were recorded using the photoacoustic cell attachment of an Analect RFX 65 FTIR spectrometer. Spectral contributions from protein occur at 1650, 1550, 1240 cm-1; mineral contributions at 1030 - 1060 cm-1, 600 - 560 cm-1, 870 cm-1. Specimens exposed to the Nd:YAG without water show a substantial reduction in the absorption bands attributable to protein and an additional band at 2015 cm-1. In the presence of water, the band at 2015 cm-1 does not appear at the lower energy density but is recorded at an energy density of 1429 J/cm2 when the surface is darkened. The spectra of the CO2 treated specimens, with the char layer present, show a significant reduction in the protein bands and additional bands at 2015 and 2200 cm-1, that are tentatively assigned to the cyanamide and cyanate ions, respectively (Dowker and Elliott, 1979). These results suggest a reaction of the organic matrix and mineral with laser exposure.

Paper Details

Date Published: 1 May 1995
PDF: 9 pages
Proc. SPIE 2394, Lasers in Dentistry, (1 May 1995); doi: 10.1117/12.207454
Show Author Affiliations
Paulette Spencer, Univ. of Missouri/Kansas City School of Dentistry (United States)
Charles M. Cobb, Univ. of Missouri/Kansas City School of Dentistry (United States)
Mark H. McCollum, Univ. of Missouri/Kansas City School of Dentistry (United States)
David M. Wieliczka, Univ. of Missouri/Kansas City (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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