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Endodontics · single question

Which statement is TRUE regarding pulp canal obliteration (calcific metamorphosis)?

  1. The pulp canal space is clearly visible radiographically
  2. The canal is histologically absent / completely gone
  3. The tooth shows a decreased (or absent) response to cold testing
  4. It always requires immediate root canal treatment
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Correct answer: C. The tooth shows a decreased (or absent) response to cold testing

  • A. Opposite. The canal appears obliterated/narrowed (not clearly visible) on radiographs.
  • B. False. A canal space persists histologically even when it cannot be seen radiographically.
  • C. Correct. Continued/irregular dentin deposition narrows the canal, so the pulp typically shows reduced or no response to cold (and other) vitality tests.
  • D. Many obliterated teeth stay asymptomatic and are simply monitored; RCT is not automatic.

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