On-line version ISSN 1980-5373
CORRER, Américo Bortolazzo et al. Effect of exposure time vs. irradiance on knoop hardness of dental composites. Mat. Res. [online]. 2006, vol.9, n.3, pp. 275-280. ISSN 1980-5373. http://dx.doi.org/10.1590/S1516-14392006000300006.
A comparison was made of the hardness of Z250 and Esthet-X composites light cured with different light sources. Cavities (3 mm diameter x 6 mm deep) were prepared in 240 bovine incisors. The composite was bulk inserted and light-cured using halogen light, LED or xenon plasma arc (PAC) with different irradiances and exposure times, maintaining the same energy density. The specimens were stored in an incubator at 37 °C for 24 hours prior to sectioning for hardness measurements. Three measurements were taken at each depth: surface, 1, 2, 3, 4 and 5 mm. The data were analyzed by ANOVA and Tukey's test (p < 0.05). No statistically significant differences were found for LED up to 2 mm, for PAC up to 3 mm, and for halogen light up to 5 mm. Photoactivation with intermediate power density and exposure time resulted in the highest Knoop hardness values.
Keywords : composite resin; energy density; Knoop hardness; light curing.