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Prosthodontics & Occlusion · single question

A crown impression shows a poorly captured finish line because gingival tissue collapsed over the margin during the impression. What should you do?

  1. Trim the impression and pour it anyway
  2. Retake the impression after gingival displacement with retraction cord
  3. Send it to the lab with a note
  4. Add more material over the defective area
Show answer and explanation

Correct answer: B. Retake the impression after gingival displacement with retraction cord

  • A. Trimming a defective margin produces an inaccurate die and an ill-fitting crown — never acceptable.
  • B. Correct. Place retraction cord to displace the gingiva and expose a dry, readable finish line, then retake the impression.
  • C. A lab cannot fabricate an accurate margin from an unreadable impression.
  • D. Adding material over a set impression creates distortion and a 'double mix' artifact.

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