Intrabony Defect Classification — NDEB AFK MCQ
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Correct answer: E — Two walls of bone remaining surrounding the defect
Intrabony (vertical) defects are classified by the number of remaining bony walls: three-wall (best prognosis for regeneration), two-wall (crater), one-wall (worst prognosis), or combined defects. A two-wall defect has two remaining osseous walls (typically buccal and lingual, or mesial and distal) surrounding the defect. Three-wall defects are most predictable for guided tissue regeneration and bone grafting.
Reference: Newman – Newman and Carranza's Clinical Periodontology, 13th ed., 2019