Effect of thermocycling to adhesive interface of enamel analyzed by polarized light microscopy

Authors

  • Rafael Simões Gonçalves Department of Dentistry, Endodontic and Dental Materials – Bauru School of Dentistry – University of São Paulo – Bauru – SP – Brazil.
  • Naiara Montes da Silva Department of Restorative Dentistry – Araçatuba Dental School – UNESP – Univ Estadual Paulista – Araçatuba – São Paulo – Brazil.
  • Mauricio Umeno Watanabe Department of Restorative Dentistry – Araçatuba Dental School – UNESP – Univ Estadual Paulista – Araçatuba – São Paulo – Brazil.
  • Mirela Sanae Shinohara Department of Restorative Dentistry – Araçatuba Dental School – UNESP – Univ Estadual Paulista – Araçatuba – São Paulo – Brazil.

DOI:

https://doi.org/10.14295/bds.2016.v19i4.1346

Abstract

Objective: The less aggressive demineralization of enamel by self-etching systems results in greater staining, marginal leakage, and failure in their restorations, so this study aimed to assess the silver nitrate infiltration and tag formation of the enamel/adhesive interface. Material and Methods: Two hundred enamel fragments were randomly assigned into 10 groups according to the adhesive system (Single Bond Adper Plus-(SB), Clearfil Tri-S Bond-(CF), or Scotchbond Universal-(SBU)) and enamel surface (ground-(ge), unground-(ue), phosphoric acid etching-(pha), or none) (n=10): (SB-ue), (SB-ge), (CF-ue), (CF-ge), (CF-ue/pha), (CF-ge/pha), (SBU-ue), (SBU-ge), (SBU-ue/pha), and (SBU-ge/pha). Half of the restored samples were submitted to thermocycling. Four slices of 1.0mm/sample were obtained to evaluate tag formation and silver nitrate infiltration. All of the specimens were examined with Polarized Light Microscopy, and the percentage of infiltration was quantified. Results: No interactions were found among the three factors. The adhesive and aging exhibited an interaction. Significant differences were found only after thermocycling: the SB and SBU-etched groups had decreased infiltration compared with the other groups. The tag length after etching was higher for ge compared with ue, regardless of the adhesive system. Conclusion: The self-etching techniques resulted in significantly less tag formation compared with the conventional technique.

Keywords

Adhesives; Aging; Dental enamel; Microscopy, polarization; Silver nitrate.

Author Biographies

Rafael Simões Gonçalves, Department of Dentistry, Endodontic and Dental Materials – Bauru School of Dentistry – University of São Paulo – Bauru – SP – Brazil.

Department of Dentistry, Endodontic and Dental Materials

Naiara Montes da Silva, Department of Restorative Dentistry – Araçatuba Dental School – UNESP – Univ Estadual Paulista – Araçatuba – São Paulo – Brazil.

Department of Restorative Dentistry

Mauricio Umeno Watanabe, Department of Restorative Dentistry – Araçatuba Dental School – UNESP – Univ Estadual Paulista – Araçatuba – São Paulo – Brazil.

Department of Restorative Dentistry

Mirela Sanae Shinohara, Department of Restorative Dentistry – Araçatuba Dental School – UNESP – Univ Estadual Paulista – Araçatuba – São Paulo – Brazil.

Department of Restorative  Dentistry

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Published

2016-11-29

Issue

Vol. 19 No. 4 (2016): Oct. - Dec. / 2016 - Published November 2016

Section

Clinical or Laboratorial Research