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

Luis Eduardo Silva Soares; Airton Abrahao Martin; Antônio Luiz Barbosa Pinheiro

doi:10.1117/12.476445

3 July 2003 Degree of conversion in dental resins polymerized by Argon laser, halogen lamp and LED: a Raman study

Luis Eduardo Silva Soares, Airton Abrahao Martin, Antônio Luiz Barbosa Pinheiro

Proceedings Volume 4950, Lasers in Dentistry IX; (2003) https://doi.org/10.1117/12.476445
Event: Biomedical Optics, 2003, San Jose, CA, United States

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.

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Luis Eduardo Silva Soares, Airton Abrahao Martin, and Antônio Luiz Barbosa Pinheiro "Degree of conversion in dental resins polymerized by Argon laser, halogen lamp and LED: a Raman study", Proc. SPIE 4950, Lasers in Dentistry IX, (3 July 2003); https://doi.org/10.1117/12.476445

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KEYWORDS

Raman spectroscopy

Light emitting diodes

Halogens

Argon ion lasers

Composite resins

Lamps

Polymerization

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