Abstract
In this study, four different groups were prepared in a cast model of an arch
that received four implants made with a Co-Cr dental alloy. The surface of
each group was prepared by four different surface treatments, including
sandblasting with Al2O3 grains (SB), conventional finishing with dental burs
(CF), milling with a CAD/CAM device (MIL), and electrodischarge machining
(EDM). The characterization of the roughness parameters, morphology, elemental
composition, and electrochemical properties of a dental Co-Cr alloy in
different surface states exposed to an oral environment were reported. The
electrochemical properties were tested with open-circuit potential (OCP) and
anodic scan in Ringer’s solutions. The results of roughness parameters,
elemental composition, OCP, corrosion potential and pitting potential were
statistically analyzed by one-way ANOVA and the Tukey-Kramer multiple-
comparison test at 95% confidence level. The roughness parameters classified
the surfaces from smoothest to roughest according to the following order; CF,
MIL, EDM, and SB. The CF group has the best corrosion resistance followed by
the EDM, MIL, and SB groups.