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Proceedings Paper

Degree of cure of composite resins polymerized by light-emitting diode: an FT-Raman study
Author(s): Luis Eduardo Silva Soares; Rick Rocha; Airton Abrahao Martin; Antonio Luiz Barbosa Pinheiro; Patricia Maria do Nascimento; Marcelo J. P. Zampieri; Egberto Munin
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Paper Abstract

The degree of conversion (DC) of Z100 (3M) composite resin photoactivated by both Light-Emitting Diode and halogen lamp was evaluated by FT-Raman Spectroscopy. Eighteen circular blocks of resin (Φ 6mm X 3mm) were cured either by the LED (λ = 470nm, 190mW/cm2,Φ = 8mm) and by the halogen lamp (λ = 400-500nm, 600mW/cm2,Φ = 7mm) varying the irradiation time (20, 40 and 60s). The resin surfaces were analyzed immediately after curing by FT-Raman Spectroscopy. The FT-Raman results showed the reduction in monomer trough changes in the intensity of the peak at 1640cm-1 as a function of irradiation time. The samples that were cured by 60s with LED source reached the maximum degree of conversion of 52% and 50% for the irradiated and non-irradiated surface, respectively. Whereas the samples cured by the same irradiation time, but with halogen lamp, those values were around only 4% higher for each surface with no statistically significant difference. It was observed no statistically significant differences in the DC values between both light sources used with 40s of irradiation. Therefore we conclude that, despite of their reduced irradiance, LEDs can cure composite resin ensuring a DC without statistically significant differences from the halogen lamp.

Paper Details

Date Published: 3 July 2003
PDF: 6 pages
Proc. SPIE 4950, Lasers in Dentistry IX, (3 July 2003); doi: 10.1117/12.476530
Show Author Affiliations
Luis Eduardo Silva Soares, Univ. do Vale do Paraíba (Brazil)
Rick Rocha, Univ. do Vale do Paraíba (Brazil)
Airton Abrahao Martin, Univ. do Vale do Paraíba (Brazil)
Antonio Luiz Barbosa Pinheiro, Univ. Federal da Bahia (Brazil)
Patricia Maria do Nascimento, Univ. do Vale do Paraíba (Brazil)
Marcelo J. P. Zampieri, Univ. Federale de Sao Carlos (Brazil)
Egberto Munin, Univ. do Vale do Paraíba (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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