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Artigo Científico | Restauração | Inglês | 10/10/2004
Autores: Andresa Carla Obici, Elisabete Frollini, Lourenço Correr Sobrinho, Mário Alexandre Coelho Sinhoreti, Simonides Consani
Palavras-chave: composite resin, degree of conversion, dental materials, depth of cure, ftir, photo-activation methods
Resumo: 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 (a = 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.
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