Periodontitis Staging and Grading (2017 World Workshop)
Periodontitis stage I to IV and grade A to C under the 2017 World Workshop classification.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Interdental attachment loss at the site of greatest loss
- 6 mm
- Teeth lost to periodontitis
- 0
- Bone loss at the worst site
- 40 %
- Age
- 45 years
- Smoking
- Non-smoker
- Diabetes and HbA1c
- No diabetes
Result: Periodontitis stage III, grade B: stage from interdental attachment loss 6 mm; grade from bone loss / age 0.89, as no direct evidence of progression was entered.
The tool opens with these values already filled in. Replace them with your own.
What you enter
- Interdental attachment loss at the site of greatest loss
- Radiographic bone loss, if no attachment loss is available
- Teeth lost to periodontitis (0 if none)
- Maximum probing depth
- Vertical bone loss of 3 mm or more
- Furcation involvement, class II or III
- Moderate ridge defect
- Needs complex rehabilitation (stage IV complexity)
The other 6 fields
- Extent
- Direct evidence of progression over 5 years
- Bone loss at the worst site
- Age
- Smoking
- Diabetes and HbA1c
How this is calculated
Citation
Tonetti MS, Greenwell H, Kornman KS. Staging and grading of periodontitis: framework and proposal of a new classification and case definition. J Periodontol. 2018;89 Suppl 1:S159-S172. Tables as reproduced in Int Dent J 2021 (PMC9275292). Read the sources: Tonetti 2018 ↗, Papapanou 2018 ↗, Int Dent J 2021 ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.