Table 1 Diagnostic criteria for different degrees of periodontitis
Periodontitis | Diagnostic criteria |
|---|---|
No | No evidence of mild, moderate, or severe periodontitis |
Mild |  ≥ 2 interproximal sites with AL ≥ 3 mm and ≥ 2 interproximal sites with PD ≥ 4 mm (not on the same tooth), or one site with PD ≥ 5 mm |
Moderate |  ≥ 2 interproximal sites with AL ≥ 4 mm (not on the same tooth), or ≥ 2 interproximal sites with PD ≥ 5 mm (not on the same tooth) |
Severe |  ≥ 2 interproximal sites with AL ≥ 6 mm (not on the same tooth) and ≥ 1 interproximal site with PD ≥ 5 mm |