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Odontologia Clínico-Científica (Online)

versão On-line ISSN 1677-3888

Resumo

SANTANA, Dejenane Pereira et al. Evaluation of microhardness on polymerization's photo of resin composites by halogen light and light emitting diode. Odontol. Clín.-Cient. (Online) [online]. 2010, vol.9, n.3, pp. 239-242. ISSN 1677-3888.

The light curing of resin composite by halogen light is frequent in dental. Therefore the light emitting diodes (LEDs), have been suggested in opposite to halogen light, which can present more advantages. The aim of this study was to evaluate the microhardness of the two resin composites, a condensable resin (Tetric Ceram) and other flow resin (Tetric Flow), using two light curing units, a halogen light (Ultarlux EL) and a LED (Ultraled XP). Forty specimens (5x5x6 mm) were obtained using a matrix of teflon and dividing in four groups: Group I - Halogen Tetric Ceram; Grupo II - LED Tetric Ceram; Grupo III - Halogen Tetric Flow e Grupo IV - LED Tetric Flow. After the sandpaper and the polish of specimens, the Vickers' microhardness analysis on top and base was measured in all specimens. The values obtained were submitted to a two-way variation of ANOVA analysis and the pared test t (Student's) to level of 5% significance. The results showed that source halogen light was more effective (p<0.05) than LED. When two types of resin composite were compared, the Tetric Ceram presented microhardness values higher (p<0.05) than Tetric Flow and the top regions obtained microhardness values higher (p<0.05) in relation to base regions independently of light unit used. The results suggest that halogen light curing unit is more effective than LED.

Palavras-chave : composite resins; light curing; mirohardness; light emitting diode.

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