Prosthodontics & Occlusion · single question
After seating a crown, it did not fully seat and showed open margins distally with occlusal discrepancy. What is the MOST likely cause?
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Correct answer: A. Contact point too tight on the distal surface
An excessively tight proximal (distal) contact prevents full crown seating, causing apparent open margins and bite discrepancy.
- A. CORRECT. A tight proximal contact (distal) is the most common reason a crown fails to fully seat. The contact prevents the crown from dropping to the preparation finish line, creating open margins and apparent occlusal discrepancy.
- B. Occlusal interference on the preparation would prevent complete seating from the occlusal direction but would not specifically cause a distal open margin.
- C. Die spacer issues would cause an overly tight internal fit uniformly, not a specific proximal problem.
- D. Insufficient mesial reduction would cause problems on the mesial side, not explain a distal open margin.
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