Prosthodontics & Occlusion · single question
What is the recommended finishing line for a porcelain-fused-to-metal (PFM) crown margin?
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Correct answer: C. Chamfer
A chamfer finish line is the standard recommended margin design for PFM crowns — it provides adequate bulk for the metal collar/porcelain margin while being more conservative of tooth structure than a full shoulder. A full shoulder is reserved more for all-ceramic crowns needing maximum esthetic bulk, and a feather edge does not provide sufficient bulk for a durable PFM margin.
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