Spectroscopic comparison of the effects of CO2, Nd:YAG, and water-cooled Nd:YAG on tooth root

Paulette Spencer; Charles M. Cobb D.D.S.; Mark H. McCollum; David M. Wieliczka

doi:10.1117/12.207454

1 May 1995 Spectroscopic comparison of the effects of CO₂, Nd:YAG, and water-cooled Nd:YAG on tooth root

Paulette Spencer, Charles M. Cobb D.D.S., Mark H. McCollum, David M. Wieliczka

Proceedings Volume 2394, Lasers in Dentistry; (1995) https://doi.org/10.1117/12.207454
Event: Photonics West '95, 1995, San Jose, CA, United States

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.

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Paulette Spencer, Charles M. Cobb D.D.S., Mark H. McCollum, and David M. Wieliczka "Spectroscopic comparison of the effects of CO₂, Nd:YAG, and water-cooled Nd:YAG on tooth root", Proc. SPIE 2394, Lasers in Dentistry, (1 May 1995); https://doi.org/10.1117/12.207454

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