Periapical Index (PAI)
Periapical Index (PAI) 1 to 5 for up to four roots.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Root 1 PAI score
- 2: small changes in bone structure
- Root 2 PAI score
- 4: periodontitis with a well-defined radiolucent area
Result: PAI 4: periodontitis with a well-defined radiolucent area. Apical periodontitis (PAI 3 to 5). Roots: root 1 PAI 2, root 2 PAI 4.
The tool opens with these values already filled in. Replace them with your own.
What you enter
- Root 1 PAI score
- Root 2 PAI score
- Root 3 PAI score
- Root 4 PAI score
How this is calculated
Citation
Ørstavik D, Kerekes K, Eriksen HM. The periapical index: a scoring system for radiographic assessment of apical periodontitis. Endod Dent Traumatol. 1986;2(1):20-34. Read the sources: Ørstavik 1986 ↗, Iran Endod J 2018 ↗, Int Endod J 2020 ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.