[1][2] Apical delta refers to the branching pattern of small accessory canals and minor foramina seen at the tip or apex of some tooth roots.

Because the anatomy of this area is very small and complex with several portals of entry to the root canal i.e. more than one apical foramen.

In reality, determining the exact position of the apical foramen is problematic, requiring radiography and/or use of an electronic apex locator to produce a refined estimate.

A tooth may have multiple small accessory canals in the root apex area forming an apical delta which can complicate the endodontic problem.

The root tip is removed during apicoectomy to eliminate the apical delta and maximise the chance of successful healing.