Pre-sintered Y-TZP sandblasting: effect on surface roughness, phase transformation, and Y-TZP/veneer bond strength

Authors

  • Carla Müller Ramos-Tonello Faculdades Metropolitanas Unidas; Faculdade de Odontologia
  • Bruno Freitas Trevizo Universidade de São Paulo; Faculdade de Odontologia de Bauru
  • Raphaela Farias Rodrigues Universidade de São Paulo; Faculdade de Odontologia de Bauru; Departamento de Dentística, Endodontia e Materiais Dentários
  • Ana Paula Rodrigues Magalhães Universidade de São Paulo; Faculdade de Odontologia de Bauru; Departamento de Dentística, Endodontia e Materiais Dentários
  • Adilson Yoshio Furuse Universidade de São Paulo; Faculdade de Odontologia de Bauru; Departamento de Dentística, Endodontia e Materiais Dentários
  • Paulo Noronha Lisboa-Filho Univ. Estadual Paulista; Faculdade de Ciências; Departamento de Física
  • Americo Sheitiro Tabata Univ. Estadual Paulista; Faculdade de Ciências; Departamento de Física
  • Ana Flávia Sanches Borges Universidade de São Paulo; Faculdade de Odontologia de Bauru; Departamento de Dentística, Endodontia e Materiais Dentários

DOI:

https://doi.org/10.1590/1678-7757-2017-0131

Keywords:

Zirconium, Ceramics, Surface properties, Shear strength

Abstract

Sandblasting is a common method to try to improve the Y-TZP/veneer bond strength of dental prostheses, however, it may put stress on zirconia surfaces and could accelerate the t→m phase transformation. Y-TZP sandblasting before sintering could be an alternative to improve surface roughness and bonding strength of veneering ceramic. Objectives. The aim of this study was to analyze the effect of Y-TZP pre-sintering sandblasting on surface roughness, phase transformation, and the Y-TZP/veneer shear bond strength. Material and Methods. The Y-TZP specimen surface underwent sandblasting with aluminum oxide (50 μm) pre-sintering (Z-PRE) and post-sintering (Z-POS). Z-CTR was not subjected to surface treatment. After ceramic veneer application, the specimens were subjected to shear bond testing. Surface roughness was analyzed by confocal microscopy. Y-TZP monoclinic and tetragonal phases were evaluated by micro-Raman spectroscopy. Shear bond strength and surface roughness data were analyzed by One-way ANOVA and Tukey tests (α=0.05). Differences in the wave numbers and the broadening bands of the Raman spectra were compared among groups. Results. Z-POS (9.73±5.36 MPa) and Z-PRE (7.94±2.52 MPa) showed the highest bond strength, significantly higher than that of Z-CTR (5.54±2.14 MPa). The Ra of Z-PRE (1.59±0.23 µm) was much greater and significantly different from that of Z-CTR (0.29±0.05 µm) and Z-POS (0.77±0.13 µm). All groups showed bands typical of the tetragonal (T) and monoclinic (M) phases. Y-TZP sandblasting before sintering resulted in rougher surfaces but did not increase the shear bond strength compared to post-sintering and increased surface defects. Conclusions. Surface treatment with Al3O2, regardless of the moment and application, improves the results of Y-TZP/veneer bonding and is not a specific cause of t→m transformation.

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Published

2017-12-01

Issue

Section

Original Articles

How to Cite

Pre-sintered Y-TZP sandblasting: effect on surface roughness, phase transformation, and Y-TZP/veneer bond strength. (2017). Journal of Applied Oral Science, 25(6), 666-673. https://doi.org/10.1590/1678-7757-2017-0131