Effect of light-curing units, post-cured time and shade of resin cement on knoop hardness
In: Brazilian Dental Journal, Jg. 20 (2009), S. 410-413
Online
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Zugriff:
The aim of this study was to evaluate the Knoop hardness after 15 min and 24 h of different shades of a dual-cured resin-based cement after indirect photoactivation (ceramic restoration) with 2 light-curing units (LCUs). The resin cement Variolink II (Ivoclar Vivadent) shade XL, A2, A3 and opaque were mixed with the catalyst paste and inserted into a black Teflon mold (5 mm diameter x 1 mm high). A transparent strip was placed over the mold and a ceramic disc (Duceram Plus, shade A3) was positioned over the resin cement. Light-activation was performed through the ceramic for 40 s using quartz-tungsten-halogen (QTH) (XL 2500; 3M ESPE) or light-emitting diode (LED) (Ultrablue Is, DMC) LCUs with power density of 615 and 610 mW/cm2, respectively. The Koop hardness was measured using a microhardness tester HMV 2 (Shimadzu) after 15 min or 24 h. Four indentations were made in each specimen. Data were subjected to ANOVA and Tukey's test (a=0.05). The QTH LCU provided significantly higher (p
| Titel: |
Effect of light-curing units, post-cured time and shade of resin cement on knoop hardness
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| Autor/in / Beteiligte Person: | Regina Maria Puppin-Rontani ; Américo Bortolazzo Correr ; Correr-Sobrinho, Lourenço ; Piva, Evandro ; Ana Rosa Costa ; Mário Alexandre Coelho Sinhoreti ; Rogério Vieira Reges |
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| Zeitschrift: | Brazilian Dental Journal, Jg. 20 (2009), S. 410-413 |
| Veröffentlichung: | FapUNIFESP (SciELO), 2009 |
| Medientyp: | unknown |
| ISSN: | 0103-6440 (print) |
| DOI: | 10.1590/s0103-64402009000500009 |
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