Furcation Grading - Glickman Classification
- Just barely detectable with examination hand instruments.
- Early bone loss.
- Examination hand instrument goes partially into the furcation, but not all the way through.
- Furcation may be grade II on both sides of the tooth, but are not connected.
- Advanced bone loss.
- Examination hand instrument goes all the way through furcation, to other side of tooth.
- Furcation is through-and-through.
- Through-and-through, plus furcation is clinically visible due to gingival recession.
The AAP definition of a furcation is "The anatomic area of a multirooted tooth where the roots diverge".