Periodontitis is defined as interdental clinical attachment loss (CAL) of at least 2 mm at two or more non-adjacent teeth, or buccal/oral CAL of at least 3 mm with pocketing of at least 3 mm at two or more teeth. Exceptions include CAL caused by trauma, caries, extraction sites, endodontic lesions draining at the margin, or vertical root fractures.

3. IS THIS PERIODONTITIS?

8. HOW TO DEFINE PERIODONTITIS
1. Interdental CAL at ≥2 non-adjacent teeth
2. Buccal or oral CAL ≥3 mm with pocketing ≥3 mm at ≥2 teeth
but not diagnosed as:
1) Recession of traumatic origin.
2) Caries in the cervical area of the tooth.
3) CAL on distal of a second molar with extraction of a third
molar.
4) Endo lesion draining through the margin.
5) vertical root fracture.