Materials and Methods: Seventy-eight specimens of the VITA In-Ceram 2000 YZ cubes for InLab (n=12) ceramic with dimensions of (7x6x5) mm were sintered and divided into 6 groups: G1: alcohol cleaning; system; G2: blasting with aluminum particles coated with silica (CoJet®-Sand, 3M ESPE AG) and silanization during 5 min (Porcelain Primer); G3: Overglaze (Glaze Spray VITA AKZENT, Vita Zanhfabrik), etching (HF during 1 min) and silanization. G4: Overglaze (Glaze Spray VITA AKZENT), blasting with cojet and silanization. G5: Overglaze (Glaze AKZENT, Vita Zanhfabrik), etching with HF during 1 min and silanization; G6: Overglaze (Glaze AKZENT), blasting with cojet and silanization. The treated surfaces were evaluated by 3D optical profilometry in order to obtain the Ra and MEV data (1000x). Panavia F resin cement was made over the treated surfaces, light cured and submitted to the shear test (1mm/min). The data obtained were statistically evaluated by ANOVA (2-factors analysis of variance) and the means were compared by Tukey's test (5%). Energy Dispersive X-Ray Spectroscopy (EDS) was made in order to determine the chemical elements present on the surface of each group.
Results: The results of shear bond strength in MPa (mean + SD) followed by Ra (µm) were the following: G1 (2,28 ± 1.2) (0.14); G2 (7.89 ± 2.64) (0.51); G3 (13.33 ± 4.07) (3.37); G4 (9.24 ± 1.98) (0.41); G5 (17.78 ± 5.52) (3.79); G6 (12.47 ± 4.3) (0.4). The Tukey's test showed matching results of the surfaces treatment (etching and COJET).
Conclusions: The overglaze on the Y-TZP's cementation surface seems to modify the surface and allow other treatments to be carried out and there is increased bond strength to the resin cement.