Anatomical relationship of the mandibular canal to its surrounding structures in mature mandibles

By Denio D, Torabinejad M, Bakland LK

Date: 06/1992
Journal: JOE

Summary: 

Purpose: To study the relationship of the mandibular canal to the posterior teeth in human mandibles

N= 22 mature human mandible

Materials/Methods:

•Access cavities and Size 10 to 20 K files were placed in the canals and cemented to the most apical position

•The mandibles were sectioned with a band saw through the root apices of the 1st and 2nd premolars and molars until the endodontic file(s) could be identified.

Most highlighted Results:

•2nd  premolars (4.7mm) and 2nd molars (3.7mm) had the closest distances to the canal

•The mesial roots of the 1st molars were farthest from the canal (6.9 mm) •S-shaped curve of the canal was followed in 31% of the cases

•The canals were located lingual (19%), buccal (17%), or directly inferior (5%) to the apices of the posterior teeth.

•In 28% of the cases the canal could not be identified clearly in the 2nd  premolars and 1st molar regions

Clinical significance:

The mandibular 2nd premolar and 2nd molar are the most likely teeth to be involved in accidental damage to the mandibular canal during root canal therapy