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Proceedings Paper

Er:YAG laser irradiation of human dentin: Raman study of collagen
Author(s): Luis Eduardo S. Soares; Airton A. Martin; Aldo Brugnera; Fatima Zanin; Emilia Angela Arisawa; Marcos T. T. Pacheco
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Paper Abstract

Raman Spectroscopy was used to examine the distribution of the organic components in the human dentin before and after the chemical and thermal etching process. Polished dentin disks (n = 6/group) with 4mm thickness from twelve third molars were irradiated with Er:YAG laser. The dentin disks were prepared by polishing through a series of SiO2 papers with water and cleaned by ultrasonic system. Four pretreatment were performed. The disks were etched with 37% phoshporic acid for 15 s (group 1), Er:YAG laser 80 mJ, 3Hz, 30s. (group II), Er:YAG laser 120 mJ, 3Hz, 30s. (group III) and Er:YAG laser 180mJ, 3Hz, 30s. (group IV). The Raman spectra obtained from normal and treated dentin were analyzed. Attention was paid to the organic component (1453cm-1). Raman spectroscopy showed that the organic dentin content were more affected in autoclaved teeth than in the specimens treated by Thymol. Peak area reduction in the specimens treated by Thymol in group I and II showed to be the most conservative procedures regarding to changes in organic dentin components. Pulse energies of 120 and 180 mJ showed to preduce more reduction in the organic content associated with more reduction in the peak areas at 1453 cm-1.

Paper Details

Date Published: 28 May 2004
PDF: 7 pages
Proc. SPIE 5313, Lasers in Dentistry X, (28 May 2004); doi: 10.1117/12.529395
Show Author Affiliations
Luis Eduardo S. Soares, Univ. do Vale do Paraiba (Brazil)
Airton A. Martin, Univ. do Vale do Paraiba (Brazil)
Aldo Brugnera, Univ. do Vale do Paraiba (Brazil)
Fatima Zanin, Univ. do Vale do Paraiba (Brazil)
Emilia Angela Arisawa, Univ. do Vale do Paraiba (Brazil)
Marcos T. T. Pacheco, Univ. do Vale do Paraiba (Brazil)


Published in SPIE Proceedings Vol. 5313:
Lasers in Dentistry X
Peter Rechmann; Daniel Fried; Thomas Hennig, Editor(s)

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