Evaluation of degree of conversion and hardness of dental composites photo-activated with different light guide tips

The aim of this study was to evaluate the degree of conversion and hardness of different composite resins, photo-activated for 40 s with two different light guide tips, fiber optic and polymer. Five specimens were made for each group evaluated. The percentage of unreacted carbon double bonds (% C═C)...

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Bibliographic Details
Published in:European journal of dentistry 2013-01, Vol.7 (1), p.86-93
Main Authors: Galvão, Marília Regalado, Caldas, Sergei Godeiro Fernandes Rabelo, Bagnato, Vanderlei Salvador, de Souza Rastelli, Alessandra Nara, de Andrade, Marcelo Ferrarezi
Format: Article
Language:English
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Summary:The aim of this study was to evaluate the degree of conversion and hardness of different composite resins, photo-activated for 40 s with two different light guide tips, fiber optic and polymer. Five specimens were made for each group evaluated. The percentage of unreacted carbon double bonds (% C═C) was determined from the ratio of absorbance intensities of aliphatic C═C (peak at 1637 cm(-1)) against internal standard before and after curing of the specimen: aromatic C-C (peak at 1610 cm(-1)). The Vickers hardness measurements were performed in a universal testing machine. A 50 gf load was used and the indenter with a dwell time of 30 seconds. The degree of conversion and hardness mean values were analyzed separately by ANOVA and Tukey's test, with a significance level set at 5%. The mean values of degree of conversion for the polymer and fiber optic light guide tip were statistically different (P
ISSN:1305-7456
1305-7464