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Type: Artigo de periódico
Title: Effect of exposure time vs. irradiance on knoop hardness of dental composites
Author: Correr, Américo Bortolazzo
Sinhoreti, Mário Alexandre Coelho
Correr-Sobrinho, Lourenço
Tango, Rubens Nisie
Consani, Simonides
Schneider, Luis Felipe Jochins
Abstract: 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 &deg;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.
Subject: composite resin
energy density
Knoop hardness
light curing
Editor: ABM, ABC, ABPol
Rights: aberto
Identifier DOI: 10.1590/S1516-14392006000300006
Date Issue: 1-Sep-2006
Appears in Collections:Unicamp - Artigos e Outros Documentos

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