EFEITO DA UNIDADE DE LUZ E DA PROFUNDIDADE DE POLIMERIZAÇÃO SOBRE A MICRODUREZA DE UM COMPÓSITO

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

The aim of this study was to evaluate the influence of light curing devices in the depth of cure of one composite, using Vickers microhardness test. Specimens were prepared using a microhybrid composite Filtek Z250 (3M ESPE). The resins were placed in a bulk increment in 2 and 3 mm thick teflon cylindric molds, and then polymerized with the time of 40 seconds. The microhardness values were performed on bottom and top surface of each sample. Three curing units were used to polymerize the composite: Optilight CL (Gnatus), Radii (SDI), both LEDs and Ultralux (Dabialtante), an halogen conventional light. Ten samples were photoactivates for each light curing unit, five with 2 mm depth and five with 3 mm depth. After a 40 second time of exposure, the samples were stored in a lightproof container at 37oC for 24 hours. The bottom and top surfaces of each specimen were tested using a Vickers harness test (Shimadzu Micro Hardness Testers) which was performed under a 300 grams load for 15 seconds. Three measurements were taken in each surface. The hardness results were submitted to ANOVA test and Tukeys test at the 5% significance level, which showed statistical difference between the light curing devices. Ultralux showed higher hardnesses when compared to the others. For both depths of composite tested, there were statistical differences between the microhardness of top/bottom surfaces to Ultralux and Radii, the higher hardnesses values were achieved in the top of the specimens.

ASSUNTO(S)

compósito microhardness light-curing devices composites microdureza odontologia polimerização aparelhos fotoativadores polymerization

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