Degree of cure of composite resins polymerized by light-emitting diode: an FT-Raman study

Luis Eduardo Silva Soares; Rick Rocha; Airton Abrahao Martin; Antonio Luiz Barbosa Pinheiro; Patricia Maria do Nascimento; Marcelo J. P. Zampieri; Egberto Munin

doi:10.1117/12.476530

3 July 2003 Degree of cure of composite resins polymerized by diode laser: an FT-raman study

Luis Eduardo Silva Soares, Rick Rocha, Airton Abrahao Martin, Antonio Luiz Barbosa Pinheiro, Patricia Maria do Nascimento, Marcelo J. P. Zampieri, Egberto Munin

Author Affiliations +

Proceedings Volume 4950, Lasers in Dentistry IX; (2003) https://doi.org/10.1117/12.476530
Event: Biomedical Optics, 2003, San Jose, CA, United States

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.

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Luis Eduardo Silva Soares, Rick Rocha, Airton Abrahao Martin, Antonio Luiz Barbosa Pinheiro, Patricia Maria do Nascimento, Marcelo J. P. Zampieri, and Egberto Munin "Degree of cure of composite resins polymerized by diode laser: an FT-raman study", Proc. SPIE 4950, Lasers in Dentistry IX, (3 July 2003); https://doi.org/10.1117/12.476530

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KEYWORDS

Light emitting diodes

Halogens

Composite resins

Lamps

Raman spectroscopy

Polymerization

Polymers

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