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Proceedings Paper

Er:YAG laser irradiation on dentin: FT-Raman and SEM studies
Author(s): Luís Eduardo Silva Soares; Renata Andrade Bitar; Aldo Brugnera; Fatima A. A. Zanin; Erick B. P. Resende; Walter A. A. Jara; Airton A. Martin
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Paper Abstract

This study evaluated the molecular and morphological changes on dentin elements after the Er:YAG laser irradiation. Six human third molars were selected and the occlusal one-third of the crown was removed. The dentin surface was schematically divided into areas corresponding to four surface treatments groups: Control (Group C): 37% phosphoric acid etching; Group I: Er:YAG laser 80mJ; Group II: Er:YAG laser 120mJ; Group III: Er:YAG laser 180mJ. The characterization was performed by Scanning Electron Microscopy (SEM) and Fourier-Transformed Raman Spectroscopy (FT-Raman) before and after the treatments. A reduction of the relative intensity for the spectra was observed in the Group II and III samples. The SEM photomicrographies revealed open dentin tubules in the control group specimens. The groups I, II and III presented partially open dentin tubules. SEM images showed that the laser-irradiated dentin surface was not favorable to the diffusion of monomers. The chemical information obtained by Raman spectroscopy showed that higher laser energies (180 mJ) affected more the phosphate, carbonate and the organic components of dentin.

Paper Details

Date Published: 8 March 2007
PDF: 5 pages
Proc. SPIE 6425, Lasers in Dentistry XIII, 64250R (8 March 2007); doi: 10.1117/12.702244
Show Author Affiliations
Luís Eduardo Silva Soares, Univ. do Vale do Paraíba (Brazil)
Renata Andrade Bitar, Univ. do Vale do Paraíba (Brazil)
Aldo Brugnera, Univ. do Vale do Paraíba (Brazil)
Fatima A. A. Zanin, Univ. do Vale do Paraíba (Brazil)
Erick B. P. Resende, Univ. do Vale do Paraíba (Brazil)
Walter A. A. Jara, Univ. do Vale do Paraíba (Brazil)
Airton A. Martin, Univ. do Vale do Paraíba (Brazil)


Published in SPIE Proceedings Vol. 6425:
Lasers in Dentistry XIII
Peter Rechmann; Daniel Fried, Editor(s)

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