Artigo de Periódico
Monomer conversion of composite dental resins photoactivated by a halogen lamp and a LED: a FT-Raman spectroscopy study
Fecha
2005Registro en:
0100-4042
v. 28, n. 2.
Autor
Soares, Luís Eduardo Silva
Rocha, Rick
Martin, Airton Abrahão
Pinheiro, Antonio Luiz Barbosa
Zampieri, Marcelo
Soares, Luís Eduardo Silva
Rocha, Rick
Martin, Airton Abrahão
Pinheiro, Antonio Luiz Barbosa
Zampieri, Marcelo
Institución
Resumen
Eighteen circular blocks of resins cured either by a LED or a halogen lamp (20, 40 and 60 s), had their top (T) and bottom (B) surfaces studied using a FT-Raman spectrometer. Systematic changes in the intensity of the methacrylate C=C stretching mode at 1638 cm-1 as a function of exposure duration were observed. The calculated degree of conversion (DC) ranged from 45.0% (B) to 52.0% (T) and from 49.0% (B) to 55.0% (T) for the LED and halogen lamp, respectively. LED and halogen light produced similar DC values with 40 and 60 s of irradiation.