article
Degree of conversion of different composite resins photo-activated with light-emitting diode and argon ion laser
Registro en:
MESSIAS, A. M. et al. Degree of conversion of different composite resins photo-activated with light-emitting diode and argon ion laser. Laser Physics, v. 25, n. 2, p. 025601, 2015.
Autor
Messias, A. M.
Galvão, M. R.
Boaventura, J. M. C.
Jacomassi, D. P.
Bernardi, M. I. B.
Bagnato, Vanderlei Salvador
Rastelli, A. N. S.
Andrade, Marcelo Ferrarezi
Resumen
This study evaluated the degree of conversion (DC%) of one experimental and different brands of composite resins light-cured by two light sources (one LED and one argon laser). The percentage of unreacted C = C was determined from the ratio of absorbance intensities of aliphatic C = C (peak at 1637 cm−1) against internal standards before and after curing: aromatic C–C (peak at 1610 cm−1) except for P90, where %C = C bonds was given for C–O–C (883 cm−1) and C–C (1257 cm−1). ANOVA and Tukey’s test revealed no statistically significant difference among Z350 (67.17), Z250 (69.52) and experimental (66.61 ± 2.03) with LED, just among them and Evolu-X (75.51) and P90 (32.05) that showed higher and lower DC%, respectively. For the argon laser, there were no differences among Z250 (70.67), Z350 (69.60), experimental (65.66) and Evolu-X (73, 37), however a significant difference was observed for P90 (36.80), which showed lowest DC%. The light sources showed similar DC%, however the main difference was observed regarding the composite resins. The lowest DC% was observed for the argon laser. P90 showed the lowest DC% for both light-curing sources.