Journal of the Korean Academy of Pediatric Dentistry 2001;28(3):471-479.
Published online August 31, 2001.
HARDNESS OF COMPOSITE RESIN CURED BY HIGH INTENSITY HALOGEN LIGHT
 
Abstract
The purpose of this study was to compare the effect of the high intensity halogen light (850\sim1000mW/cm2) with that of the conventional halogen light (400mW/cm2) on the hardness of composite resin. Three resin composites (Z-100, 3M, U.S.A. : Tetric Ceram, Vivadent, Liechtenstein; SureFil, Dentsply, U.S.A.) were filed in the stainless steel moulds which were 4mm in diameter and 2, 3, 4, and 5mm in depth, respectively. They were cured under the four different modes : (1) conventional mode, 40 seconds at 400mW/cm2 (2) 'ramp' mode, 10 seconds at 100 to 1000mW/cm2 plus 10 seconds at 1000mW/cm2 (3) 'boost' mode, 10 seconds at 1000mW/cm2 and (4) 'standard' mode, 20 seconds at 850mW/cm2. The surface hardnesses of the top and the bottom of the resin samples were measured with a microhardness tester (MXT70, Matsuzawa, Japan). The top surface hardness was not significantly different among the curing modes. The bottom surface hardness was generally the highest in the conventional mode and the lowest in the high intensity boost mode. There was no significant difference in the bottom surface hardness between the conventional mode and the high intensity standard mode in 2mm depth. The results suggest that the curing time of the high intensity halogen light (850mW/cm2) should be at least 20 seconds to produce the equal level of the bottom surface hardness of 2mm resin composite as compared to the hardness produced by the conventional halogen light (400mW/cm2).
Key Words: Composite resin, Light-curing, Halogen light, High intensity, Conventional


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