Lateral Canal
An accessory branch of the main root canal that extends laterally through the dentine to the periodontal ligament space, typically located in the apical or middle third of the root.
Full Definition
Lateral canals (also called accessory canals) arise from the main canal during root development and communicate between the pulp space and the periodontal ligament. They are clinically significant because they can harbour bacteria and inflammatory products, potentially causing localised periodontal lesions that mimic primary periodontal disease. On radiographs, lateral canals are rarely visible unless filled with sealer during obturation, providing diagnostic information about root canal system complexity. Editors should note that 'lateral canal' and 'accessory canal' are used interchangeably in most literature, though some sources reserve 'lateral' for mid-root branches and 'accessory' for apical-third branches.
Usage
Usage note: 'Lateral canal' and 'accessory canal' are broadly synonymous; verify preferred term against journal or house style.
In Context
- "Sealer extrusion into a lateral canal was noted on the post-operative radiograph." — Post-operative report
- "The histological section revealed lateral canals in the middle third of the mesial root." — Research article