Yttria-Stabilized Tetragonal Zirconia Polycrystal (Y-TZP) ceramic specimens (Figure 1(b)) are made by sintering zirconia (ZrO2) powders stabilized with Yttria (Y2O3). The material was supplied by Bettini S. p. A. (Monte Marenzo, Lecco, Italy), and it is compliant to ISO 13356:1997 [20]. Sharpening was performed by a diamond grinding machine and finished by fine diamond paste polishing.