Pilloni and Rojas proposed a classification for furcation involvement. The authors are from Sapienza University of Rome.
Furcation involvement is present when periodontal disease has caused resorption of bone into the bi- or tri-furcation area of a multi-rooted tooth.
Classification:
(1) type (N if not clinically exposed, E if clinical exposed)
(2) grade (from I to III)
Horizontal Attachment Loss
Grade
<= 2 mm
I
>= 3 mm but not total
II
total (through and through)
III
Reporting - one of the following: NI, NII, NIII, EI, EII, EIII
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Specialty: Otolaryngology
