Influence of selective acid etching on microtensile bond strength of a self-adhesive resin cement to enamel and dentin

Authors

  • Lúcia Trazzi Prieto State University of Campinas
  • Cíntia Tereza Pimenta Araújo State University of Campinas
  • Maria Malerba Colombi Humel State University of Campinas
  • Eduardo José Souza-Junior State University of Campinas
  • Carlos Tadeu dos Santos Dias ESALQ University of São Paulo

DOI:

https://doi.org/10.20396/bjos.v9i4.8641735

Keywords:

Resin cement, Bond strength, Dental enamel, Dentin, Dental acid etching

Abstract

Aim: To evaluate the selective acid etching of enamel and dentin on microtensile bond strength (µTBS) of a self-adhesive resin cement. Methods: Forty-eight bovine teeth were selected and had the buccal surface ground to obtain a flat dentin (n=24) or enamel (n=24) surface. Z250 composite resin blocks (4 x 3 x 8 mm) were prepared for cementation at enamel and dentin. Each substrate received three experimental resin cementation strategies: 1) 37% phosphoric acid etching before the application of RelyX Unicem; 2) application of RelyX Unicem alone; 3) RelyX ARC as a control. Samples were light-cured using a halogen light (Optilux 501, 700mW/cm2 ), for 40 s. Hourglass-shaped specimens were obtained and submitted to a tensile strength at a crosshead speed of 0.5 mm/min in a universal testing machine. For statistical analysis, data were submitted to ANOVA and Tukey’s test at a pre-set alpha (á=0.05). Results: RelyX Unicem showed similar bond strength value (16.5 MPa) when compared to the pretreatment with acid etching (11.9 Mpa) and to the conventional resin cement (18.1 MPa) for enamel. All luting strategies presented similar dentin bond strength, but significantly lower than enamel bond strength. Conclusions: Acid etching prior to RelyX Unicem application did not improve microtensile bond strength for enamel and dentin.

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Author Biographies

Lúcia Trazzi Prieto, State University of Campinas

DDS, MS student, Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, Piracicaba, São Paulo

Cíntia Tereza Pimenta Araújo, State University of Campinas

DDS, MS, PhD student, Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, Piracicaba, São Paulo

Maria Malerba Colombi Humel, State University of Campinas

DDS, MS, PhD student, Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, Piracicaba, São Paulo

Eduardo José Souza-Junior, State University of Campinas

DDS, MS student, Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, Piracicaba, São Paulo

Carlos Tadeu dos Santos Dias, ESALQ University of São Paulo

Agronomic engineer, MS, PhD, Associate professor, Department of Exact Science, ESALQ University of São Paulo, Piracicaba, SP

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Published

2015-11-16

How to Cite

1.
Prieto LT, Araújo CTP, Humel MMC, Souza-Junior EJ, Dias CT dos S. Influence of selective acid etching on microtensile bond strength of a self-adhesive resin cement to enamel and dentin. Braz. J. Oral Sci. [Internet]. 2015 Nov. 16 [cited 2023 Feb. 4];9(4):455-8. Available from: https://periodicos.sbu.unicamp.br/ojs/index.php/bjos/article/view/8641735

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