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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.
AuthorsCésar Augusto Galvão Arrais, Aline de Cerqueira Kasaz, Luís Gustavo Barrote Albino, José Augusto Rodrigues, Andre Figueiredo Reis
JournalBrazilian oral research (Braz Oral Res) 2010 Apr-Jun Vol. 24 Issue 2 Pg. 245-9 ISSN: 1807-3107 [Electronic] Brazil
PMID20658046 (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

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