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Endodontics · single question

On a full-mouth radiograph with several endodontically treated teeth, which finding most strongly indicates a need for retreatment?

  1. A persistent periapical radiolucency with inadequate or voided obturation
  2. A well-condensed fill with a normal periodontal ligament space
  3. A symptom-free tooth with a properly fitting post and crown
  4. Slight PDL widening that has since resolved
Show answer and explanation

Correct answer: A. A persistent periapical radiolucency with inadequate or voided obturation

  • A. Correct. A lingering apical radiolucency together with poor-quality obturation signals persistent infection and is the classic indication for endodontic retreatment.
  • B. Incorrect. A dense fill with a healthy PDL indicates success, not failure.
  • C. Incorrect. An asymptomatic, well-restored tooth needs no retreatment.
  • D. Incorrect. A resolved transient widening indicates healing.

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