Table 2.

Average surface roughness (Ra) and mean roughness depth (Rz) for the different surface treatments.

Group	Ra (µm)	Rz (µm)
Group 1—Negative reference Red code bur	1.07 ± 0.05	3.69 ± 0.25
Group 2 Phosphoric acid	1.15 ± 0.21	3.92 ± 0.77
Group 3 Blue code bur	3.36 ± 0.51	10.36 ± 1.55
Group 4 Al2O3 sandblasting	0.73 ± 0.05	2.5 ± 0.18
Group 6 CoJet Sand	0.81 ± 0.07	2.81 ± 0.21