Bond strength of a resin composite and a resin-modified glass-ionomer cement associated or not with chlorhexidine to eroded dentin

Authors

  • Flavia Pardo Salata Nahsan Department of Operative Dentistry, Endodontics and Dental Materials – Bauru School of Dentistry – University of São Paulo – Bauru – SP – Brazil.
  • Martha Beteghelli Michielin Department of Operative Dentistry, Endodontics and Dental Materials – Bauru School of Dentistry – University of São Paulo – Bauru – SP – Brazil.
  • Luciana Mendonça da Silva School of Dentistry – Federal University of Amazonas – Manaus – AM – Brazil.
  • Camila Moreira Machado Department of Operative Dentistry, Endodontics and Dental Materials – Bauru School of Dentistry – University of São Paulo – Bauru – SP – Brazil.
  • Andréa Mello de Andrade Department of Dental Materials – School of Dentistry – University of São Paulo – São Paulo – SP – Brazil.
  • Paulo Afonso da Silveira Francisconi Department of Operative Dentistry, Endodontics and Dental Materials – Bauru School of Dentistry – University of São Paulo – Bauru – SP – Brazil.
  • Rafael Francisco Lia Mondelli Department of Operative Dentistry, Endodontics and Dental Materials – Bauru School of Dentistry – University of São Paulo – Bauru – SP – Brazil.
  • Linda Wang Department of Operative Dentistry, Endodontics and Dental Materials – Bauru School of Dentistry – University of São Paulo – Bauru – SP – Brazil.

DOI:

https://doi.org/10.14295/bds.2015.v18i2.1101

Abstract

Objective: Even resin composites and glass-ionomer cements are widely used for dental cervical region restorations, under erosive condition they can wear out quickly. This study aimed to compare, by means of bond strength by microshear, the performance of a resin composite (RC) and a resin-modified glass-ionomer cement (RMGIC) to eroded dentin and its association with 2% chlorhexidine up to 6 months. Material and Methods:. Eighty  sound third molars teeth were cutt to obtain flat coronal dentin, which were subsequently embedded in self-curing acrylic resin circular molds exposing only this surface available. Teeth were divided into two groups, according to the treatment with the Adper Single Bond 2 + RC Filtek Z250 (Z) or the RMGIC Vitremer (V). Half of the specimens were immersed in artificial saliva-AS for 24 hours (control groups) and half subjected to 3x/1 minute daily immersion in Regular Coca Cola ®-RC for 5 days. Half of the specimens for each described condition were treated with water and half with 2% chlorhexidine for 1 minute prior the restoration. For all groups, the specimens were stored in artificial saliva weekly renewed up to tests. The bonding strength was evaluated by  microshear test after 1 month and 6 months . Data, in normal distribution, were analyzed with 3-way ANOVA and Tukey (p <0.05). Results: Challenge factors, materials and time were statistically significant.. Restorations with Z showed significantly higher bond strength compared to V in all situations. There was a reduction in bond strength values over time for all tested conditions. The prior application of 2% chlorhexidine was able to preserve the Z bond strength between 1 and 6 months, but this factor was not statistically significant. Conclusion: For eroded dentin, the use of resin composite seems presents greater bond strength compared to resin-modified glass-material, disregarding their association to chlorhexidine or not.

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Published

2015-05-15

Issue

Vol. 18 No. 2 (2015): Apr. - Jun. / 2015 - Published May 2015

Section

Clinical or Laboratorial Research