Effect of different surface treatments and adhesive cementation on the surface topography and flexural strength of translucent and ultra-translucent monolithic zirconia

• Published in: Journal of prosthodontics
• Main Authors: da Silva, Bianca Cristina Dantas, da Silva, Sarah Emille Gomes, da Silva, Nathália Ramos, de Moreira, Fernanda Gurgel Gois, Souza, Karina Barbosa, Zhang, Yu, de Souza, Rodrigo Othávio Assunção
• Format: Journal Article
• Language: English
• Published: United States 27-08-2024
• Subjects: surface treatment; sandblasting; zirconia; flexural strength; resin cement
• ISSN: 1532-849X; 1532-849X
• DOI: 10.1111/jopr.13929

To evaluate the effect of different surface treatments and adhesive cementation on the miniflexural strength (MFS) of monolithic zirconia.
Two-hundred and forty (240) sintered bars of translucent zirconia (Z
) and ultra-translucent zirconia (Z
) were obtained (8 mm ×2 mm ×1 mm). The bars were divided into 16 groups (n = 15) according to the factors "Zirconia" (Z
and Z
), "Cementation" (Cem) and "surface treatment" (Ctrl:Control, Al:Aluminum oxide/Al
O
50 µm, Si:Silica/SiO
coated alumina particles oxide 30 µm, Gl:Glazing+hydrofluoric acid). Half of the bars received an adhesive layer application, followed by application of resin cement and light curing. The surface roughness was measured in non-cemented groups. All the bars were subjected to the MFS test (1.0 mm/min; 100 kgf). Scanning electron microscopy was used for qualitative analyses. MFS data (MPa) and roughness (µm) were statistically evaluated by three-way and two-way ANOVA respectively and Tukey's test (5%).
The surface treatment and the interaction were significant for roughness. Glazing promoted less roughness compared to silicatization. Regarding MFS, only the zirconia and surface treatment factors were significant. For Z
, the sandblasted groups had an increase in MFS and glazing reduced it. There was no difference between the groups without cementation for the Z
; however, Z
.Si/Cem, and Z
.Al/Cem obtained superior MFS among the cemented groups.
Sandblasting increases the flexural strength for Z
, while glaze application tends to reduce it. Applying resin cement increases the flexural strength of Z
when associated with sandblasting. Sandblasting protocols promote greater surface roughness.