Effect of surface treatments on repair strength, roughness and morphology in aged metal-free crowns


  • Yançanã Luizy Gruber State University of Ponta Grossa
  • Thaís Emanuelle Bakaus State University of Ponta Grossa
  • Bruna Fortes Bittencourt State University of Ponta Grossa
  • João Carlos Gomes State University of Ponta Grossa
  • Alessandra Reis State University of Ponta Grossa
  • Giovana Mongruel Gomes State University of Ponta Grossa https://orcid.org/0000-0001-6603-5239




Ceramics, Composite resins, Electron microscope tomography, Shear strength, Surface properties


Aim: The roughness and micromorphology of various surface treatments in aged metal-free crowns and the bond strength of these crowns repaired with composite resin (CR) was evaluated in vitro. Methods: A CR core build-up was confectioned in 60 premolars and prepared for metal-free crowns. Prepared teeth were molded with the addition of silicone, and the laboratory ceromer/fiber-reinforced crowns (SR Adoro/Fibrex Lab) were fabricated. Subsequently, the crowns were cemented and artificially aged in a mechanical fatigue device (1.2 X 106 cycles), then divided into 4 groups (n = 15) according to the surface treatment: 1) phosphoric acid etching (PA); 2) PA + silane application; 3) roughening with a diamond bur + PA; and 4) sandblasting with Al2O3 + PA. After the treatments, the crowns (n = 2) were qualitatively analyzed by scanning electron microscope (SEM) and surface roughness (n = 5) was analyzed before and after the surface treatment (Ra parameter). The remaining crowns (n = 8) received standard repair with an adhesive system (Tetric N-Bond) and a nanohybrid CR (Tetric N-Ceram), and the microshear bond strength (SBS) test was performed (0.5 mm/min). Roughness and SBS data were analyzed by one- and two-way ANOVA, respectively, as well as Tukey’s post-test (α = 0.05). Results: Sandblasting with Al2O3 + PA resulted in the highest final roughness and SBS values. The lowest results were observed in the PA group, whereas the silane and diamond bur groups showed intermediate values. Conclusion: It may be concluded that indirect ceromer crowns sandblasted with aluminum oxide prior to PA etching promote increased roughness surface and bond strength values.


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Author Biographies

Yançanã Luizy Gruber, State University of Ponta Grossa

Department of Restorative Dentistry, School of Dentistry, State University of Ponta Grossa, PR, Brazil

Thaís Emanuelle Bakaus, State University of Ponta Grossa

Department of Restorative Dentistry, School of Dentistry, State University of Ponta Grossa, PR, Brazil.

Bruna Fortes Bittencourt, State University of Ponta Grossa

Department of Restorative Dentistry, School of Dentistry, State University of Ponta Grossa, PR, Brazil.

João Carlos Gomes, State University of Ponta Grossa

Department of Restorative Dentistry, School of Dentistry, State University of Ponta Grossa, PR, Brazil.

Alessandra Reis, State University of Ponta Grossa

Department of Restorative Dentistry, School of Dentistry, State University of Ponta Grossa, PR, Brazil.

Giovana Mongruel Gomes, State University of Ponta Grossa

Department of Restorative Dentistry, School of Dentistry, State University of Ponta Grossa, PR, Brazil.


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How to Cite

Gruber YL, Bakaus TE, Bittencourt BF, Gomes JC, Reis A, Gomes GM. Effect of surface treatments on repair strength, roughness and morphology in aged metal-free crowns. Braz. J. Oral Sci. [Internet]. 2020 May 5 [cited 2023 Jan. 30];19:e206155. Available from: https://periodicos.sbu.unicamp.br/ojs/index.php/bjos/article/view/8656155

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