Comptes rendus de l’Acade'mie bulgare des Sciences, Vol 73, No11, pp.1510-1516
Influence of Mechanical and Chemical Modification Techniques on Zirconia Surface Roughness
Mariela Tsanova-Stamatova, Neshka Manchorova-Veleva, Tsvetanka Babeva
3D profilometry is a highly technological method successfully used in dentistry for evaluating materials’ roughness. The aim of our in vitro study was to estimate the effect of mechanical and chemical agents on surface roughness and microscopic structure of zirconia polycrystals by means of 3D profilometry. Seven groups of yttria-stabilized KATANA™Zirconia (Kuraray Noritake Dental Inc.) samples were prepared: one control group (no pretreatment); four groups sandblasted with 50 µm and 250 µm Al2O3 particles at a pressure of 2 and 4 bars and two groups treated with HF (hydrofluoric acid) of 10% and 40% concentration. Each specimen was with diameter and thickness of 11.8 mm and 5.0 mm, respectively. 3D optical profilometry was used to study the surface topography and roughness of the samples. By comparison with control group it was demonstrated that the most suitable treatment that leads to the highest surface roughness values is sand blasting with 50 µm Al2O3 particles at a pressure of 4 bars. This method can be suggested as an effective method for surface pretreatment of zirconia.
Key words: profilometry, zirconia, ceramics, surface modification, roughness