Does incorporation of TiO2 nanotubes in air-abraded high translucent zirconia influence shear bond strength?

The present in vitro study evaluated the effect of titanium nanotubes (nTiO2) application on high translucent zirconia (Copra Supreme, Whitepeaks) on shear bond strength values with different self-adhesive resin cements (Panavia V5, G-Cem One, and Variolink Esthetic DC). One hundred and forty-eight specimens were prepared and randomly divided into four groups (n = 37) according to surface treatment groups (air-abraded sintered zirconia, air-abraded pre-sintered zirconia, application of nTiO2 on zirconia, and application of nTiO2 on air-abraded zirconia). nTiO2 were produced by alkaline hydrothermal synthesis, mixed with isopropyl alcohol (50 wt%), and applied on pre-sintered zirconia. The surface roughness (Ra) was examined. Sintered surfaces were characterized by field emission scanning electron microscope (Fe-SEM), and energy-dispersive X-ray spectroscopy (EDS) analysis. Surface treatment groups were randomly divided into three subgroups according to self-adhesive resin cement (n = 12). Luting procedures were performed and specimens were stored in water at 21 °C for 6 months before the shear bond strength test. Data were analyzed by one-way ANOVA and two-way ANOVA. Fe-Sem images and EDS confirmed the incorporation of nTiO2 on zirconia. Surface treatment methods affected the Ra of zirconia (p <.001). Surface treatment method (p =.013) and self-adhesive resin cement (p <.001) affected shear bond strength values. The lowest shear bond strength values were achieved in applied nTiO2 on high translucent zirconia specimens (p <.05). The lowest shear bond strength values were determined in the Variolink Esthetic DC group (p <.05). Application of nTiO2 on air-abraded high translucent zirconia surface had no significant effect on the shear bond strength (p >.05). [ABSTRACT FROM AUTHOR]