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Type: Artigo de periódico
Title: Degree of conversion of Z250 composite determined by fourier transform infrared spectroscopy: comparison of techniques, storage periods and photo-activation methods
Author: Obici, Andresa Carla
Sinhoreti, Mário Alexandre Coelho
Frollini, Elisabete
Correr Sobrinho, Lourenço
Consani, Simonides
Abstract: The purpose of this study was to evaluate the degree of conversion (DC) of the Z250 composite, using six photo-activation methods, two storage periods and two preparation techniques of the FTIR specimens (n = 3). For the KBr pellet technique, the composite was placed into a metallic mold and photo-activated as follows: continuous light, exponential light, intermittent light, stepped light, PAC and LED. The measurements were made after 24 h and 20 days. For the resin film technique, approximately 0.07 g of the composite was pressed between two polyester strips, photo-activated as above described and analyzed. The DC was calculated by the standard technique and submitted to ANOVA and Tukey's test (alpha = 5%). Independently of the storage period and specimen preparation technique, there were no significant differences among photo-activation methods. No statistical difference was observed between the time periods used. The specimens analyzed under the KBr pellet technique presented higher DC values than those analyzed by the resin film technique.
Subject: dental materials
composite resin
degree of conversion
photo-activation methods
depth of cure
Editor: ABM, ABC, ABPol
Citation: Materials Research. ABM, ABC, ABPol, v. 7, n. 4, p. 605-610, 2004.
Rights: aberto
Identifier DOI: 10.1590/S1516-14392004000400014
Date Issue: 1-Dec-2004
Appears in Collections:Unicamp - Artigos e Outros Documentos

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