It evaluated the effects of different zirconia surface treatments on the bond strength of a resin cement to Y-TZP (yttria-stabilized tetragonal zirconia) ceramics, as well as their phase-transformations. 75 blocks (5mmx5mmx4mm) of Y-TZP were assigned into five groups (n=15): (tribochemical silica coating - TBS) zirconia surface was abraded by silica coated alumina particles followed by silanization; (GLZ(1)) zirconia surface received the application of a thin layer of low-fusing porcelain glaze, followed by hydrofluoric acid (HF) etching for 1min; (GLZ(5)) glaze application + HF etching by 5min; (GLZ(10)) glaze application+HF etching by 10min; (GLZ(15)) glaze application +HF etching by 15min. After etching, all the specimens were washed, dried and silanized. Cylinders of composites (diameter: 3.25mm; height: 3mm) were cemented to the Y-TZP blocks using a resin cement. All the specimens were subjected to aging (10,000 thermal cycles and 90days storage), tested under shear conditions, and finally analyzed by a stereomicroscope (failure analysis). In addition, we also performed topographical and phase transformation analyses of the treated zirconia surfaces. The TBS group presented the highest bond strength value (23.34MPa). The glazedgroups presented low bond valuesand high prevalences of pretest failures. X-ray diffraction analysis showed a phase transformation for the TBS group (13.14%); however, there was no clear phase change observed for the GLZ groups. From our results, we concluded thattribochemical silica coating is the main Y-TZP surface conditioning for resin bond improvements.