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Endodontics · single question

Successful retention of a post/restoration after root canal therapy depends primarily on:

  1. The amount of remaining sound tooth structure (ferrule)
  2. The interocclusal space
  3. The shade of the final crown
  4. The type of rubber dam used
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Correct answer: A. The amount of remaining sound tooth structure (ferrule)

  • A. Correct. Long-term success depends on remaining coronal tooth structure and an adequate ferrule (≥1.5–2 mm of sound tooth circumferentially), which resists fracture and provides retention/resistance form.
  • B. Interocclusal space matters for the restoration but is not the primary determinant of post/core retention.
  • C. Shade is esthetic, not retentive.
  • D. The rubber dam type is irrelevant to retention.

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