Effect of curing mode on the hardness of dual-cured composite resin core build-up materials.

Abstract

This study evaluated the Knoop Hardness (KHN) values of two dual-cured composite resin core build-up materials and one resin cement exposed to different curing conditions. Two dual-cured core build-up composite resins (LuxaCore-Dual, DMG; and FluoroCore2, Dentsply Caulk), and one dual-cured resin cement (Rely X ARC, 3M ESPE) were used in the present study. The composite materials were placed into a cylindrical matrix (2 mm in height and 3 mm in diameter), and the specimens thus produced were either light-activated for 40 s (Optilux 501, Demetron Kerr) or were allowed to self-cure for 10 min in the dark (n = 5). All specimens were then stored in humidity at 37 degrees C for 24 h in the dark and were subjected to KHN analysis. The results were submitted to 2-way ANOVA and Tukey's post-hoc test at a pre-set alpha of 5%. All the light-activated groups exhibited higher KHN values than the self-cured ones (p = 0.00001), regardless of product. Among the self-cured groups, both composite resin core build-up materials showed higher KHN values than the dual-cured resin cement (p = 0.00001). LuxaCore-Dual exhibited higher KHN values than FluoroCore2 (p = 0.00001) when they were allowed to self-cure, while no significant differences in KHN values were observed among the light-activated products. The results suggest that dual-cured composite resin core build-up materials may be more reliable than dual-cured resin cements when curing light is not available.

• Authors: César Augusto Galvão Arrais, Aline de Cerqueira Kasaz, Luís Gustavo Barrote Albino, José Augusto Rodrigues, Andre Figueiredo Reis
• Journal: Brazilian oral research (Braz Oral Res) 2010 Apr-Jun Vol. 24 Issue 2 Pg. 245-9 ISSN: 1807-3107 [Electronic] Brazil
• PMID: 20658046 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Composite Resins
• Resin Cements

Topics

• Analysis of Variance
• Composite Resins (chemistry, radiation effects)
• Curing Lights, Dental
• Hardness Tests
• Light-Curing of Dental Adhesives (methods)
• Materials Testing
• Post and Core Technique (instrumentation)
• Resin Cements (chemistry, radiation effects)
• Self-Curing of Dental Resins (methods)
• Temperature
• Time Factors