Química Nova (Mar 2005)

Monomer conversion of composite dental resins photoactivated by a halogen lamp and a LED: a FT-Raman spectroscopy study

  • Luís Eduardo Silva Soares,
  • Rick Rocha,
  • Airton Abrahão Martin,
  • Antonio L. B. Pinheiro,
  • Marcelo Zampieri

DOI
https://doi.org/10.1590/S0100-40422005000200012
Journal volume & issue
Vol. 28, no. 2
pp. 229 – 232

Abstract

Read online

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.

Keywords