Apical Foramen
Pronunciation: AY-pih-kul foh-RAY-men
The principal opening at or near the anatomical apex of a tooth root through which the pulp's neurovascular supply enters and exits.
Full Definition
The apical foramen is the main canal opening at the root apex, through which blood vessels, lymphatics, and nerves pass between the dental pulp and the periapical tissues. It is frequently situated slightly eccentric to the anatomical apex. In endodontic documentation, the working length is measured to the apical constriction (the narrowest point of the canal), which is typically 0.5–1 mm coronal to the foramen. Editors must distinguish 'apical foramen' from 'apical constriction' and 'apical delta', terms that describe different anatomical landmarks in root canal therapy reports.
Usage
Usage note: Plural is 'apical foramina', not 'apical foramens'. Distinguish clearly from 'apical constriction' in endodontic text.
In Context
- "The electronic apex locator detected the working length 1 mm short of the apical foramen." — Endodontic treatment record
- "Extrusion of sealer beyond the apical foramen was noted on the post-obturation radiograph." — Root canal therapy case report