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Prosthodontics & Occlusion · single question

A crown preparation impression comes back grossly distorted (voids, tearing, incomplete margins). What should be done?

  1. Nothing — proceed to fabricate the restoration from the impression as-is
  2. The impression should be retaken, since inaccuracies will be directly reproduced in the die/restoration, leading to poor fit and marginal integrity
  3. Send it to the lab and let them decide whether it's usable
  4. Only remake it if the patient complains about the final crown
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Correct answer: B. The impression should be retaken, since inaccuracies will be directly reproduced in the die/restoration, leading to poor fit and marginal integrity

A poor-quality impression cannot be expected to produce an accurate die or restoration — distortions, voids, and incomplete margins translate directly into fit, contact, and margin problems in the final prosthesis. Standard of care is to retake any impression that does not meet quality criteria, before proceeding further.

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