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RPD Framework Alloy — NDEB AFK MCQ

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ModerateDental MaterialsRPD Framework AlloyNDEB AFK

Which type of dental alloy is most commonly used for cast metal frameworks in removable partial dentures?

Educational content. Not a substitute for clinical judgement or local policy.

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Correct answer: E — Cobalt-chromium (Co-Cr) alloy

Cobalt-chromium (Co-Cr) alloys (e.g., Vitallium) are the most commonly used alloys for RPD frameworks. They offer high yield strength and elastic modulus (allowing thinner cross-sections than gold), excellent corrosion resistance, low density (lighter than gold), good biocompatibility, and lower cost than noble metal alloys. Typical composition: ~60% Co, ~25-30% Cr, ~5% Mo. Type IV gold alloys were historically used but are now largely replaced by Co-Cr for RPD frameworks.

Reference: Anusavice – Phillips' Science of Dental Materials, 13th ed., 2022