Glickman's classification

Question 1

Grade I

Answer 1

Incipient/ early-stage lesion
Primarily affects soft tissue
Suprabony pockets (slight bone loss)
No radiographic evidence of bone loss

Question 2

Grade II

Answer 2

No through and through interradicular bone loss

Cul-de-sac with definite horizontal component

Distinct horizontal destruction of furcation

Portion of PDL remains intact

Partial penetration of Naber’s probe

Possible radiographic evidence

Question 3

Grade III

Answer 3

Through and through destruction of bone and soft tissue

Bone is not attached to the dome of furcation

Furcation is filled with soft tissue hence not clinically visible

Pocket formation

Able to pass Naber’s probe through

Radiographic evidence (small triangular radiolucency)

Question 4

Grade IV

Answer 4

Interdental bone is destroyed

Furcation is clinically visible due to gingival recession

Tunnel exists between roots of affected teeth

Radiographic evidence is noted

Periodontal probe passes from one aspect to another
(through and through tunnel)