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Effect of exposure time vs. irradiance on knoop hardness of dental composites

2006; Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímer; Volume: 9; Issue: 3 Linguagem: Inglês

10.1590/s1516-14392006000300006

1980-5373

Américo Bortolazzo Correr, Mário Alexandre Coelho Sinhoreti, Lourenço Correr‐Sobrinho, Rubens Nisie Tango, Símonídes Consani, Luis Felipe Jochins Schneider,

Laser Applications in Dentistry and Medicine

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.