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- Title
Light‐activation of resin cement through ceramic: Relationship between irradiance intensity and bond strength to dentin.
- Authors
Moraes, Rafael R.; Correr‐Sobrinho, Lourenço; Sinhoreti, Mário A. C.; Puppin‐Rontani, Regina M.; Ogliari, Fabrício A.; Piva, Evandro
- Abstract
This study investigated the relationship between the irradiance transmitted through ceramic and the bond strength of a resin cement to dentin. After application of an adhesive system, elastomer molds with cylindrical orifices (1.2 mm in diameter) were placed onto bovine dentin surfaces and filled with a photoactivated luting agent (Enforce; Dentsply Caulk). Light‐activation was performed through a 0.6‐mm‐thick ceramic disc using different intensities: 250, 400, 550, 700, or 850 mW/cm2. Control specimens were irradiated without ceramic (1050 mW/cm2). The radiant exposure was kept at 30 J/cm2. Light spectral distribution was analyzed with a spectrometer. Microshear test was conducted and modes of failure were classified under SEM. Bond strength data were analyzed with ANOVA and Student–Newman–Keuls' test (α ≤ 0.05), and failure scores with the Kruskal–Wallis test (α ≤ 0.05). A linear regression model assessed the relationship between irradiance and bond strength. Groups light‐cured at 250 and 400 mW/cm2 presented lower bond strengths than groups activated at 850 and 1050 mW/cm2. The linear regression showed that a decrease in light irradiance predicts a decrease in bond strength (r2 = 0.955; p = 0.004). A predominance of mixed failures was observed. No significant alteration in the spectral wavelengths was observed. Despite the constant energy dose, the bond strength was dependent upon the irradiance level. © 2007 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2008
- Subjects
BOND strengths; DENTIN; DENTAL cements; CERAMICS; KRUSKAL-Wallis Test
- Publication
Journal of Biomedical Materials Research, Part B: Applied Biomaterials, 2008, Vol 95B, Issue 1, p160
- ISSN
1552-4973
- Publication type
Article
- DOI
10.1002/jbm.b.30928