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Porcelain-fused-to-metal debonding — NDEB AFK MCQ

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ModerateProsthodonticsPorcelain-fused-to-metal debondingNDEB AFK

A metal-ceramic crown fractures at the porcelain-metal interface after occlusal adjustment. Laboratory review suggests inadequate oxide control and poor metal surface preparation. What is the most appropriate investigation?

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

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Correct answer: C — Review alloy surface preparation and firing protocol

Porcelain-to-metal bonding depends on compatible oxide formation, wetting, and micromechanical retention, so reviewing alloy surface preparation and firing protocol is the key investigation. A bitewing may assess fit or caries, but it does not explain interfacial porcelain-metal fracture. The pearl is that alloy selection, oxide management, and porcelain firing protocol are central to metal-ceramic success.

Reference: Dental materials and prosthodontic reference texts; NDEB KSAs 2024