Prosthodontics & Occlusion · single question
A woman has a fixed partial denture from #8–10. Tooth #10 appears opaque in the cervical third. Most likely reason?
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Correct answer: D. Metal too thick
- A. Over-preparation alone doesn't specifically cause cervical opacity.
- B. A generic 'lab error' is too vague compared with the specific structural cause.
- C. Incorrect shade affects overall color but not the localized cervical opacity seen with PFM restorations.
- D. Correct. In a porcelain-fused-to-metal restoration, insufficient porcelain over a thick metal coping/opaquer at the cervical third makes that area look opaque (the metal/opaque layer 'shows through').
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