Periodontitis | Stage I | Stage II | Stage III | Stage IV | |
Severity | Interdental CAL (at site of greatest loss) | 1 to 2 mm | 3 to 4 mm | ≥5 mm | ≥5 mm |
RBL | Coronal third (<15%) | Coronal third (15% to 33%) | Extending to middle third of root and beyond | Extending to middle third of root and beyond | |
Tooth loss (due to periodontitis) | No tooth loss | No tooth loss | ≤4 teeth | ≥5 teeth | |
Complexity | Local | Maximum probing depth ≤4 mm Mostly horizontal bone loss | Maximum probing depth ≤5 mm Mostly horizontal bone loss | In addition to Stage II complexity:
| In addition to Stage III complexity:
|
Extent and distribution | Add to stage as descriptor | For each stage, describe extent as:
|
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