**3. Results**

Samples were prepared according to the study protocol and divided by groups with the following marks: polishing (*n* = 3)—PL; milling (*n* = 3)—MC; abrasive blasting, with an abrasive size of 50 µm (*n* = 12), abrasive size 90 µm (*n* = 3), abrasive size 125 µm (*n* = 3)—AB50, AB90, AB125 respectively; plasma-electrolyte processing (*n* = 16)—PZ.
