Journal of Dentistry
Volume 37, Issue 5 , Pages 342-347, May 2009

Resistance to degradation of resin-modified glass-ionomer cements dentine bonds

  • Ticiane C. Fagundes

      Affiliations

    • Department of Operative Dentistry, Bauru School of Dentistry, University of São Paulo, Bauru, Brazil
    • ,
  • Manuel Toledano

      Affiliations

    • Department of Dental Materials, School of Dentistry, University of Granada, Av. Fuerzas Armadas n°1, 1°B, 18014 Granada, Spain
    • ,
  • Maria Fidela L. Navarro

      Affiliations

    • Department of Operative Dentistry, Bauru School of Dentistry, University of São Paulo, Bauru, Brazil
    • ,
  • Raquel Osorio

      Affiliations

    • Department of Dental Materials, School of Dentistry, University of Granada, Av. Fuerzas Armadas n°1, 1°B, 18014 Granada, Spain
    • Corresponding Author InformationCorresponding author. Tel.: +34 958 243788; fax: +34 958 240908.

Received 3 December 2008; received in revised form 29 December 2008; accepted 6 January 2009.

Abstract 

Objective

To evaluate the effect of EDTA pre-treatment of dentine on resistance to degradation of the bond between dentine and resin-modified glass-ionomer cements.

Methods

Sixty non-carious human molars underwent cavity preparations. Teeth were restored with Fuji II LC or Vitremer. Half of the cavities were restored following manufacturers’ instructions whereas the other half was pre-treated with EDTA (0.1M, pH 7.4) for 60s. Teeth were stored in water at 37°C for 24h, 3 months or submitted to 10% NaOCl immersion for 5h. Teeth were sectioned into beams (1±0.1mm) and tested to failure in tension at 0.5mm/min. Bond strength data (MPa) were analyzed by ANOVA and SNK multiple-comparisons tests (p<0.05).

Results

When EDTA was used for pre-treatment of dentine, higher bond strengths were observed for both cements. Degradation challenges produced a decrease in bond strength values only in the Vitremer group. This decrease was avoided when EDTA was used for dentine treatment before restoring with Vitremer.

Conclusions

EDTA pre-treatment of dentine increases bond strength of resin modified glass-ionomers cements to dentine and improves resistance to degradation of the bond between Vitremer and dentine.

Keywords: Glass-ionomer cements, Dentine, EDTA, Adhesion, Bonds degradation

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PII: S0300-5712(09)00005-0

doi:10.1016/j.jdent.2009.01.002

Journal of Dentistry
Volume 37, Issue 5 , Pages 342-347, May 2009

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