Prosthodontics & Occlusion · single question
A patient complains that their PFM crown appears opaque near the gum line. What is the cause — EXCEPT:
Show answer and explanation
Correct answer: D. Wrong shade of opaque
✓ D) Wrong shade of opaque is the EXCEPTION.
The opaque appearance near the cervical margin is most commonly caused by: insufficient tooth reduction leaving a thin porcelain layer that cannot mask the metal/opaque; the metal showing through; or insufficient gingival margin reduction. The shade of opaque affects color but 'wrong shade' is not a primary cause of visible opacity — the underlying issue is insufficient ceramic thickness to mask the opaque and metal.
The opaque appearance near the cervical margin is most commonly caused by: insufficient tooth reduction leaving a thin porcelain layer that cannot mask the metal/opaque; the metal showing through; or insufficient gingival margin reduction. The shade of opaque affects color but 'wrong shade' is not a primary cause of visible opacity — the underlying issue is insufficient ceramic thickness to mask the opaque and metal.
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