Three-dimensional topographic scanning electron microscope and Raman spectroscopic analyses of the irradiation effect on teeth by Nd:YAG, Er: YAG, and CO(2) lasers

Journal of Biomedical Materials Research. Part B, Applied Biomaterials
Magda K YamadaFumio Watari

Abstract

A three-dimensional analyzer installed in a scanning electron microscope was used to evaluate the morphology and surface roughness using noncontact profilometry. Observations were carried out on the enamel and dentin surface irradiated by three different lasers: Nd:YAG (wavelength 1.06 microm), Er:YAG (2.94 microm), and CO(2) (10.6 microm). Spectroscopic analysis was done by Raman spectroscopy for nonirradiated and laser-irradiated surfaces. The lasers were applied perpendicularly to vertically sectioned and polished human extracted caries-free molars. The tooth was sectioned at each cavity for cross-section analysis after laser irradiation. Irradiation by Nd:YAG and CO(2) lasers of the enamel surface showed an opaque white color, different from dentin where the surface turned black. The Er:YAG laser induced no changes in color of the dentin. Numerous cracks associated with thermal stress were observed in the CO(2) laser-irradiated dentin. Noncontact surface profile analysis of Er:YAG laser-irradiated enamel and dentin showed the deepest cavities, and direct cross-sectional observations of them showed similar cavity outlines. The CO(2) laser-irradiated dentin had the least surface roughness. Raman spectroscopic analysis showed ...Continue Reading

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Citations

Jul 14, 2010·Lasers in Medical Science·Luís Eduardo S SoaresAirton A Martin
Jan 8, 2013·Lasers in Medical Science·Jociana Bandeira de MeloWanessa Christine de Souza-Zaroni
Mar 14, 2007·Photomedicine and Laser Surgery·Luís Eduardo Silva SoaresAirton Abrahão Martin
Sep 7, 2007·Photomedicine and Laser Surgery·Luís Eduardo Silva SoaresAirton Abrahão Martin
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