Abstract
Statement of problem
How the corrosion properties of cobalt-chromium (Co-Cr) and Ti (Ti-6Al-4V) alloys,
frequently used in dental prostheses, are affected by different production methods
is unclear.
Purpose
The purpose of this in vitro study was to compare Co-Cr and Ti-6Al-4V alloys produced
by computer-aided design and computer-aided manufacturing (CAD-CAM) milling or laser
sintering in terms of corrosion, ion release, and surface hardness.
Material and methods
Co-Cr and Ti-6Al-4V specimens were produced by CAD-CAM milling and direct metal laser
sintering/selective laser sintering techniques. Testing included Vickers hardness
and then open circuit potential (OCP), Tafel extrapolation, and static immersion to
determine the corrosion behavior. The study used an inductively coupled plasma mass
spectrometer to measure ion release. The data were analyzed by using the Kruskal-Wallis
and Mann-Whitney U tests, with Bonferroni correction (α=.05).
Results
The Ti-6Al-4V laser-sintered group showed the highest Vickers hardness value (P<.008), the lowest OCP value (P<.008), and the lowest corrosion potential (Vcorr) value (P<.008). The corrosion current density (Icorr) level of the Co-Cr CAD-CAM milling group was statistically significantly lower than
that of the Ti-6Al-4V CAD-CAM milling and the Ti-6Al-4V laser-sintered groups (P<.008). The highest weight change was observed in the Ti-6Al-4V laser-sintered group.
The Co, Cr, and Ti ion emissions were higher in specimens produced by laser sintering
(P<.05), and no statistically significant difference in terms of Al and V oscillations
was found among the groups (P>.05).
Conclusions
Ti-6Al-4V alloys may be a good alternative for patients with Co-Cr allergies, but as
per the results of this study, Co-Cr still seems more suitable for clinical use.
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Article info
Publication history
Published online: August 04, 2022
Footnotes
Supported by an Istanbul University Research Fund (Project No: 31623).
Identification
Copyright
© 2022 by the Editorial Council for the Journal of Prosthetic Dentistry.
