Abstract
Purpose: To evaluate the shear bond strength (SBS) between Y-TZP and a resin luting agent, after 1 of 2
enhancing strategies with TiO2--nts was applied, either to the resin luting agent or the Y-TZP mass, in
different concentrations.
Methods: In the Strategy TiO2-nts on ceramic, the resin luting agent Panavia F2.0TM (Kuraray) and an
experimental Y-TZP with added concentrations of TiO2--nts (0%, 1%, 2%, and 5% vol/vol) and a commercial Y-TZP, comprised 5 different groups (n = 10). In the Strategy TiO2-nts on cement, the resin luting
agent RelyX U200TM (3 M ESPE) was added with different concentrations of TiO2--nts (0%, 0.3%, 0.6%,
0.9% wt/wt) luted to a commercial Y-TZP, comprising 4 different groups (n = 10). The Y-TZP discs were
included in acrylic bases, and a cylinder (3 × 3 mm) of the correspondent luting agent for each respective
group was applied over them. After 24 h, specimens were subjected to SBS assessments in a universal
testing machine. Field emission scanning electron microscopy and energy dispersive X-ray spectroscopy
analyses were also performed on Y-TZP surfaces. Data were analyzed via analysis of variance and Tukey
tests (α = 0.05).
Results: TiO2-nts on ceramic influenced the bond strength significantly, but not linearly; TiO2-nts on
cement did not influence bond strength when analyzed separately, nor in comparison with the first.
Conclusion: Y-TZP enhancements with TiO2-nts led to a higher SBS with Panavia F2.0, a 5% TiO2--nt
concentration presented the highest bond strength. Modified Rely X U200 did not improve SBS.
