volume 16, issue 3, P218-224 2005
DOI: 10.1590/s0103-64402005000300009
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Abstract: The aim of this study was to evaluate the effect of the increase of energy density on Knoop hardness of Z250 and Esthet-X composite resins. Cylindrical cavities (3 mm in diameter X 3 mm in depth) were prepared on the buccal surface of 144 bovine incisors. The composite resins were bulk-inserted and polymerized using different light-curing units and times: conventional QTH (quartz-tungstenhalogen; 700 mW/cm 2 ; 20 s, 30 s and 40 s); LED (light-emitting diode; 440 mW/cm 2 ; 20 s, 30 s and 40 s); PAC (xenon plas…

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