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 Concept

# Apex Locator

## Definition

An electronic device that measures impedance changes to determine the position of the apical foramen. Modern multi-frequency apex locators are accurate to within 0.5 mm in most clinical conditions.

## Clinical Guides

[Working Length Determination](https://endo-guide.app/working-length)

## Related Terms

[Crown-Down Technique](https://endo-guide.app/glossary/crown-down-technique)[Canal Transportation](https://endo-guide.app/glossary/canal-transportation)[Debris Extrusion](https://endo-guide.app/glossary/debris-extrusion)[Reversible Pulpitis](https://endo-guide.app/glossary/reversible-pulpitis)[Irreversible Pulpitis](https://endo-guide.app/glossary/irreversible-pulpitis)[Pulp Necrosis](https://endo-guide.app/glossary/pulp-necrosis)

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