Please use this identifier to cite or link to this item: https://repositorio.ufrn.br/handle/123456789/21205
Title: Evaluation of degree of conversion and hardness of dental composites photo-activated with different light guide tips
Authors: Galvão, M. R.
Caldas, Sergei Godeiro Fernandes Rabelo
Bagnato, Vanderlei Salvador
Rastelli, Alessandra Nara de Souza
Andrade, Marcelo Ferrarezi
Keywords: Composite resins;hardness;polymerization
Issue Date: 2013
Citation: GALVÃO, Marília Regalado et al. Evaluation of degree of conversion and hardness of dental composites photo-activated with different light guide tips. European Journal of Dentistry, v. 7, n. 1, p. 86-93, 2013.
Portuguese Abstract: Objective: 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. Methods: 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%. Results: The mean values of degree of conversion for the polymer and fiber optic light guide tip were statistically different (P<.001). The hardness mean values were statistically different among the light guide tips (P<.001), but also there was difference between top and bottom surfaces (P<.001). Conclusions: The results showed that the resins photo-activated with the fiber optic light guide tip promoted higher values for degree of conversion and hardness.
URI: https://repositorio.ufrn.br/jspui/handle/123456789/21205
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