Effect of several repair techniques on the bond strength between composite resin and degraded Y-TZP ceramic


  • Vinícius Felipe Wandscher Franciscan University (UFN) (Prosthodontics Unit) – Santa Maria – RS – Brazil. http://orcid.org/0000-0002-2542-3590
  • Luana Brondani Private Practice.
  • Gabriel Kalil Rocha Pereira Meridional Faculty – IMED – Passo Fundo – RS – Brazil.
  • Renata Marques de Melo São Paulo State University (Unesp) – Institute of Science and Technology, São José dos Campos – Department of Restorative Dentistry – São José dos Campos – SP – Brasil.




Objective: To evaluate the bond strength of different repair treatments for composite resin to aged Y-TZP ceramics.  Material and Methods: Zirconia blocks were cut into smaller specimens, sintered according to manufacturer’s recommendations (final dimensions of 4×4×3 mm), and randomly allocated into nine groups (n=15) according to the surface treatment and presence/absence of aging of the substrate (subjected to low-temperature degradation - LTD), as follows: without LTD (Control: without treatment; TBS: tribochemical silica coating + silane + adhesive); with LTD (Control-LTD: without treatment; TBS-LTD: TBS with hydrothermal degradation; MoS-LTD: Monobond S + adhesive; MoP-LTD: Monobond Plus + adhesive; MZP-LTD: Metal/Zirconia Primer + adhesive; USB-LTD: Single Bond Universal; AP-LTD: Alloy primer + adhesive). LTD was simulated in an autoclave (134 °C, 2 bar, 5 h). The ceramic blocks were embedded in PVC cylinders with a self-curing acrylic resin; each surface treatment protocol was performed; a composite resin cylinder (Æ: 3.25 mm and height: 3 mm) was then build-up using split metallic matrices. All the specimens were aged (thermocycling + storage in water for 90 days) and subjected to the shear bond strength test using a universal testing machine (1 mm/min). The failure mode was classified into four types: adhesive, composite resin cohesive fracture, ceramic cohesive fracture, and mixed. The bond strength values were subjected to Mann–Whitney test. Results: Only air-abraded samples (TBS and TBS–LTD) survived thermocycling. More than 80% of the samples of the other groups presented pre-test failures. TBS groups presented higher values of bond strength (3.94) compared to TBS-LTD (0.96). The predominant type of failure for the surviving samples were adhesive. Conclusion: Air particle abrasion is mandatory to improve the bond strength of the Y-TZP substrate; an aged substrate presents an even more unfavorable scenario for adhesion.


 Dental prosthesis repair; Hydrothermal degradation; Zirconia; Shear bond strength; Sandblasting.


Author Biography

Vinícius Felipe Wandscher, Franciscan University (UFN) (Prosthodontics Unit) – Santa Maria – RS – Brazil.

Prosthodontics Unit






Clinical or Laboratorial Research Manuscript