Glickman classification (Furcation involvement)

Furcations can be:

  • Class I
    • Incipient or early stage of furcation involvement.
  • Class II
    • Cul-de-sac involvement
    • Vertical bone loss may be present
  • Class III
    • Through and through involvement
  • Class IV
    • Through and through with no soft tissue occluding the openings
    • Complete visualization possible