[Durgical](https://durgical.com/en/) › [DurgiPedia](https://durgical.com/en/durgipedia/) › [Dentistry](https://durgical.com/en/dentistry/) › [Endodontics](https://durgical.com/en/dentistry/areas/endodontics/) › Endodontic–periodontal lesions

# Endodontic–periodontal lesions

- Oral pathology

Some infections involve both the pulp and the gum pocket of the same tooth. Testing the pulp tells which came first and what to treat first.

Updated Nov 12, 2026

**See it in 3D:** [Gums (gingiva)](https://durgical.com/en/anatomy/gums/)

## Key points

- Pulp and periodontium communicate via apex, lateral canals and tubules.
- Vitality testing decides; a necrotic pulp means endo first.
- Root damage means a poor prognosis.

## What it is

The pulp and the periodontium are connected through the apical foramen, lateral canals and dentine tubules, so disease in one can reach the other. An endodontic–periodontal lesion is a pathological communication between them in one tooth. The current classification first asks whether the root is damaged (fracture, perforation, resorption), because that changes the prognosis, and then whether the patient has periodontitis.

## How to recognise it

- Signs: a deep pocket reaching the apex, a radiolucency around the root, pain, swelling, a sinus tract or mobility.
- Pulp tests are the key: a necrotic pulp means an endodontic component.
- A narrow, deep, isolated pocket in a root-filled tooth suggests a vertical root fracture.
- Root damage (fracture, perforation, resorption) gives a poor prognosis.
- In a patient without periodontitis, a lesion of endodontic origin often heals well with root canal treatment alone.

## Differential and risks

- Treat the endodontic cause first, wait for healing, then reassess and treat the remaining periodontal defect.
- Deep scaling of a lesion that is really endodontic can damage the attachment that would have healed.
- Differential: periodontal abscess (vital pulp, generalised pockets) and periapical abscess (necrotic pulp, no deep pocket).

## Next step / Initial management

- Test pulp vitality, probe all around the tooth and take a periapical radiograph.
- Necrotic pulp: refer to the dentist for root canal treatment first, with periodontal re-evaluation after healing.
- Suspected fracture or perforation: refer to the endodontist; extraction is often needed.

## Test yourself

Think of the answer, then tap the question to see it.

## What is the single most useful test in an endodontic–periodontal lesion?

Pulp vitality testing: a necrotic pulp shows that an endodontic component is present.

## Which treatment comes first when the pulp is necrotic?

Root canal treatment, followed by periodontal re-evaluation once it has healed.

## What does a narrow, deep, isolated pocket on a root-filled tooth suggest?

A vertical root fracture.

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## Connections

## See it in 3D 1

The structures of Durgical's 3D anatomy where it is found.

- [Gums (gingiva)](https://durgical.com/en/anatomy/gums/)

## Related 5

- [Endodontic diagnosis: naming pulp and apical disease](https://durgical.com/en/dentistry/endodontic-diagnosis-naming-pulp-and-apical-disease/)
- [Periodontal abscess versus periapical abscess](https://durgical.com/en/dentistry/periodontal-abscess-versus-periapical-abscess/)
- [Periodontal probing: pockets, bleeding and attachment loss](https://durgical.com/en/dentistry/periodontal-probing-pockets-bleeding-and-attachment-loss/)
- [Cracked tooth and vertical root fracture](https://durgical.com/en/dentistry/cracked-tooth-and-vertical-root-fracture/)
- [Pulp and periapical tests: cold, heat, percussion and palpation](https://durgical.com/en/dentistry/pulp-and-periapical-tests-cold-heat-percussion-and-palpation/)

## Related conditions 1

- [Periodontitis](https://durgical.com/en/conditions/periodontitis/)

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Educational content; it does not replace assessment by a dentist or doctor and is not a clinical instruction. For facial or neck swelling with difficulty swallowing or breathing, a knocked-out tooth or bleeding that will not stop, go to an emergency department at once.

Sources: [Interpreting Endodontic-Periodontal Lesions: A Conceptual Framework Based on Pulpal and Periodontal Findings, a Narrative Review](https://pmc.ncbi.nlm.nih.gov/articles/PMC13025299/) (Dentistry Journal (PMC open access), 2026); [Clinical Efficacy of Treatment of Endodontic-Periodontal Lesions: A Systematic Scoping Review of Experimental Studies](https://pmc.ncbi.nlm.nih.gov/articles/PMC9603271/) (International Journal of Environmental Research and Public Health (PMC open access), 2022); [Periodontal Abscess](https://www.ncbi.nlm.nih.gov/books/NBK560625/) (StatPearls Publishing (NCBI Bookshelf), 2023).

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Representative model, for educational purposes only.

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Source: https://durgical.com/en/dentistry/endodontic-periodontal-lesions/
License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Cite as: DurgiPedia (durgical.com), https://durgical.com/en/dentistry/endodontic-periodontal-lesions/