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Proceedings Paper

Degree of conversion in dental resins polymerized by argon laser, halogen lamp and LED: a Raman study
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Paper Abstract

Raman Spectroscopy was used in the present investigation to evaluate the degree of conversion of composite resin, photoactivated by the Halogen lamp, the Argon Laser beam and by the Light Emitting Diode. Eighteen circular blocks of resin (7mm X 2,5mm) were cured by the Halogen light source (n = 9, λ = 400-500nm, Power density = 478 mW/cm2), by the Argon laser beam (n = 9, λ = 488nm, Power density = 625 mW/cm2) and nine blocks (6mm X 3mm) by the LED (n = 9, λ = 475 ± 15nm, Power density = 190mW/cm2) using the same irradiation time (20, 40 and 60 seconds). The resin surfaces were analyzed immediately after curing by Raman and FT-Raman Spectroscopy. The Raman results show changes of the relative intensities between the peaks at 1610 and the 1640cm-1, as a function of irradiation time. After 60s of irradiation time, the maximum degree of conversion reached for the samples cured either by the Argon laser, the Halogen lamp and LED were 66,4%, 62,2% and 52%, respectively. The Argon laser was more effective and shown a better biocompatibility, with less residual monomer in the bottom.

Paper Details

Date Published: 3 July 2003
PDF: 7 pages
Proc. SPIE 4950, Lasers in Dentistry IX, (3 July 2003); doi: 10.1117/12.476445
Show Author Affiliations
Luis Eduardo Silva Soares, Univ. do Vale do Paraiba (Brazil)
Airton Abrahao Martin, Univ. do Vale do Paraiba (Brazil)
Antônio Luiz Barbosa Pinheiro, Univ. do Vale do Paraiba (Brazil)
Univ. Federal da Bahia (Brazil)

Published in SPIE Proceedings Vol. 4950:
Lasers in Dentistry IX
Peter Rechmann D.D.S.; Daniel Fried; Thomas Hennig, Editor(s)

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