Light-activation of resin cement through ceramic: Relationship between irradiance intensity and bond strength to dentin

  1. Rafael R. Moraes1,
  2. Lourenço Correr-Sobrinho1,
  3. Mário A. C. Sinhoreti1,
  4. Regina M. Puppin-Rontani2,
  5. Fabrício A. Ogliari3,
  6. Evandro Piva3,*

Article first published online: 5 SEP 2007

DOI: 10.1002/jbm.b.30928

Issue

Journal of Biomedical Materials Research Part B: Applied Biomaterials

Journal of Biomedical Materials Research Part B: Applied Biomaterials

Volume 85B, Issue 1, pages 160–165, April 2008

Additional Information

How to Cite

Moraes, R. R., Correr-Sobrinho, L., Sinhoreti, M. A. C., Puppin-Rontani, R. M., Ogliari, F. A. and Piva, E. (2008), Light-activation of resin cement through ceramic: Relationship between irradiance intensity and bond strength to dentin. Journal of Biomedical Materials Research Part B: Applied Biomaterials, 85B: 160–165. doi: 10.1002/jbm.b.30928

Author Information

  1. 1

    Department of Restorative Dentistry, Dental Materials Area, Piracicaba School of Dentistry, State University of Campinas, SP, Brazil

  2. 2

    Department of Pediatric Dentistry, Piracicaba School of Dentistry, State University of Campinas, SP, Brazil

  3. 3

    Department of Restorative Dentistry, School of Dentistry, Federal University of Pelotas, RS, Brazil

*Department of Restorative Dentistry, School of Dentistry, Federal University of Pelotas, RS, Brazil

Publication History

  1. Issue published online: 6 MAR 2008
  2. Article first published online: 5 SEP 2007
  3. Manuscript Accepted: 25 JUN 2007
  4. Manuscript Revised: 7 JUN 2007
  5. Manuscript Received: 3 MAR 2007

Funded by

  • Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP), Brazil. Grant Number: 05/54522-1

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Keywords:

  • adhesion;
  • ceramic;
  • dental material;
  • mechanical properties;
  • polymerization

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

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