Prosthodontics & Occlusion · single question
During crown try-in, the crown will not fully seat and there are open margins on the distal. What is the most likely cause?
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Correct answer: A. Tight interproximal contact on the distal
- A. ✅ Correct. If the crown stops short with open margins SPECIFICALLY on the distal, a TIGHT DISTAL INTERPROXIMAL CONTACT is preventing full seating — the crown is contacting the adjacent distal tooth before it reaches the preparation.
- B. ❌ Over-reduction would cause excess space/gap — not inability to seat.
- C. ❌ Impression distortion causes global misfit, not a localized distal contact issue.
- D. ❌ Internal surface interference would prevent seating from all directions equally, not selectively produce a distal open margin.
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