Different surface treatment protocols of a Y-TZP ceramic with a superficial glaze layer

Keywords: Zirconium, Glass, Dental cements.

Abstract

Aim: evaluate the influence of etching time with hydrofluoric acid on the bond strength of a Yttrium-stabilized polycrystalline tetragonal zirconia (Y-TZP) ceramic with a superficial glaze layer and a resin cement. Methods: Y-TZP blocks were cut to obtain 40 samples. They were distributed into four groups (n = 10): control treated by sandblasting with silica-coated alumina (RS) and three glazed experimental groups with different etching times: GS20s, GS60s and GS100s. Cementation was done with a universal adhesive and a resin cement. Two cement cylinders were made in each block. After thermocycling, the shear bond test was performed. Two extra samples of each group were made to obtain profilometry, scanning electron microscopy, mapping and backscattered electron detector images. Energy dispersive spectrometry and goniometry were also performed. Results: Kruskal-Wallis and Dunn tests demonstrated bond strength differences only between the RS (22.10MPa) and the GS groups (GS20s: 8,10Mpa; GS60s: 10.49MPa; GS100s: 7.53MPa) (p = 0.001), but there was no difference among the experimental groups (p > 0.05). The contact angles were 55.33º (RS); 70.78° (GS100s); 48.20º (GS60s) and 28.73º (GS20s). ANOVA and Tukey test demonstrated similar wettability of RS to GS60s and GS100s (p > 0.05), but all the experimental groups were statistically different between them (p < 0.001). Qualitative image analysis revealed an irregular glaze distribution after etching. The thickness of the remaining glaze layer measured by profilometry was 5±1μm (GS20S), 4±1μm (GS60S) and 3±1μm (GS100s). Conclusion: The etching time of glazed zirconia did not influence the adhesive strength of the ceramic to the resin cement.

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Author Biographies

Jean Soares Miranda, Braz Cubas University

Professor in the disciplines of Dental Prosthesis, TMD and Integrated Clinic at Braz Cubas University.

Ronaldo Luís Almeida de Carvalho, Braz Cubas University

Professor of Dentistry at Braz Cubas University. PhD in Restorative Dentistry, Institute of Science and Technology - Paulista State University "Júlio de Mesquita Filho".

Aline Serrado de Pinho Barcellos, Paulista State University

Doctoral student and Master in Restorative Dentistry, Institute of Science and Technology - Paulista State University.

Rodrigo Othávio de Assunção e Souza, Federal University of Rio Grande do Norte

Professor of the Graduate Program in Dentistry of the Federal University of Rio Grande do Norte and Collaborating Professor of the Graduate Program of UNESP.

Estevão Tomomitsu Kimpara, Paulista State University Júlio de Mesquita Filho

Full Professor at São José dos Campos School of Dentistry, Paulista State University Júlio de Mesquita Filho.

Fabíola Pessôa Pereira Leite, Paulista State University Júlio de Mesquita Filho

PhD in Dentistry Partial Prosthesis by Paulista State University Júlio de Mesquita Filho. Associate Professor 3 at the Federal University of Juiz de Fora.

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Published
2019-09-09
How to Cite
Miranda, J. S., Carvalho, R. L. A. de, Barcellos, A. S. de P., Souza, R. O. de A. e, Kimpara, E. T., & Leite, F. P. P. (2019). Different surface treatment protocols of a Y-TZP ceramic with a superficial glaze layer. Brazilian Journal of Oral Sciences, 18, e191504. https://doi.org/10.20396/bjos.v18i0.8656589