Stainless Steel Crown Composition — MFDS Part 1 MCQ
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Correct answer: B — Iron, chromium, and nickel
The correct answer is B. Conventional paediatric stainless steel crowns are formed from an iron-based stainless steel alloy containing chromium and commonly nickel. Chromium creates a protective oxide layer that provides corrosion resistance, while nickel contributes to the alloy's ductility and formability. Exact percentages vary between crown products, so fixed percentage figures should not be treated as universal. Cobalt–chromium is used for other dental prostheses rather than conventional paediatric preformed metal crowns. Gold–silver–copper, titanium–aluminium, and tin–copper–zinc describe different metallic alloy systems and are not the standard composition of these crowns.
Reference: Guy’s and St Thomas’ NHS Foundation Trust. Stainless steel crowns for children, section ‘How stainless steel crowns look’. Last reviewed July 2026. https://www.guysandstthomas.nhs.uk/health-information/stainless-steel-crowns-children