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Abstract
The in vitro chloride corrosion resistance of a number of new dental alloys proposed for use as dental implants and as porcelain substrates have been evaluated along with controls of Inlay Gold and Vitallium in a physiological saline solution by both open circuit potential-time measurements and potentiostatic anodic polarization study.
Based upon criteria such as initial and 24-hr open circuit potentials, presence or absence of active/passive transition, extent of passive region, and breakdown potentials, it has proved possible to qualitatively define a range of in vitro chloride corrosion behavior with a group of passivating alloys (Plantenium, Vitallium, Nobilium) at one end of the range (passive), the so-called “base-metals” intended for porcelain substrates at the other end of the range (active), and those dental alloys containing appreciable concentrations of noble metals (> 50%) at the center.
Typical values for passive/active boundaries of the range are: initial potentials +200/-700 mV, 24-hr potentials +115/-375 mV, extent of passive region 100/600 mV, and breakdown potentials 0/+900 mV.