Influence of acid etching on shear strength of different glass ionomer cements

  • Carolina Carvalho Bortoletto University Nove de Julho
  • Walter Gomes Miranda Junior University of São Paulo
  • Lara Jansiski Motta University Nove de Julho
  • Sandra Kalil Bussadori University Nove de Julho

Abstract

Aim: To assess the influence of dental etching on the shear strength of different glass ionomer cements. Methods: The crown of 60 bovine incisors was prepared to obtain a flat, smooth surface, were attached to a PVC tube and randomly divided into six groups: Group 1 – Riva Self Cure without etching; Group II – Riva Self Cure with pre-etching; Group III – Maxxion R without etching; Group IV – Maxxion R with pre-etching; Group V – Ketac™Molar Easymix without etching; and Group VI – Ketac™Molar Easymix with pre-etching. Etching was performed with 10% polyacrylic acid for 30 s. A standardizing device was used for preparation of the test specimens (SBS Test Method). Following preparation, the specimens were stored in distilled water at 37º C for 24 h. The shear test was performed on a Kratos universal testing machine at a crosshead speed of 0.5 mm/min. The specimens were then viewed under a stereomicroscope at a magnification of x90 for analysis of fractures. Results: The results revealed that pre-etching increased the shear strength of Riva glass ionomer cement (SDI) alone, whereas no statistically significant differences were found with regard to the other materials tested. Conclusions: Pre-etching with 10% polyacrylic acid for 30 s increased the shear strength of Riva glass ionomer cement.

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Author Biographies

Carolina Carvalho Bortoletto, University Nove de Julho
Master’s degree student in Rehabilitation Sciences, University Nove de Julho, São Paulo, SP.
Walter Gomes Miranda Junior, University of São Paulo
Department of Dental Material, School of Dentistry, University of São Paulo, São Paulo, SP.
Lara Jansiski Motta, University Nove de Julho
Department of Pediatric Dentistry, University Nove de Julho, São Paulo, SP.
Sandra Kalil Bussadori, University Nove de Julho
Department of Rehabilitation Sciences, University Nove de Julho, São Paulo, SP.
Published
2015-10-19
How to Cite
Bortoletto, C. C., Miranda Junior, W. G., Motta, L. J., & Bussadori, S. K. (2015). Influence of acid etching on shear strength of different glass ionomer cements. Brazilian Journal of Oral Sciences, 12(1), 11-15. https://doi.org/10.20396/bjos.v12i1.8641118
Section
Article