Prosthodontics & Occlusion · single question
Why do base metal RPD frameworks have corrosion resistance despite lacking noble metals?
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Correct answer: C. Surface oxide layer
Base metal alloys (cobalt-chromium) achieve corrosion resistance through a surface oxide layer u2014 a thin, passive film of chromium oxide that prevents further corrosion. Noble metal content is irrelevant here because base metals by definition contain no noble metals.
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