Furcation Classification — NDEB AFK MCQ
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Correct answer: B — Class III (through-and-through)
Glickman Class III furcation involvement is a through-and-through defect where a periodontal probe can pass completely through the furcation from one surface to another. Class I has horizontal probing ≤3 mm (incipient). Class II has horizontal probing >3 mm but does not extend through the furcation (cul-de-sac). Class III furcation involvement has the worst prognosis and may require hemisection, root amputation, or extraction.
Reference: Newman – Newman and Carranza's Clinical Periodontology, 13th ed., 2019