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Periodontics · single question

Which infrabony (intrabony) defect configuration is most common?

  1. One-wall defect
  2. Two-wall defect
  3. Circumferential defect
  4. Three-wall defect
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Correct answer: B. Two-wall defect

  • A. One-wall (hemiseptal) defects are less common and have the poorest regenerative prognosis.
  • B. Correct. Two-wall defects — classically the interdental 'crater' between adjacent teeth — are the most frequently encountered infrabony defect.
  • C. Circumferential defects encircling the root are relatively uncommon.
  • D. Three-wall defects have the BEST regenerative prognosis because of the blood supply and space maintenance from surrounding walls, but they are less common than two-wall.

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