Purpose: To study the relationship of the mandibular canal to the posterior teeth in human mandibles
N= 22 mature human mandible
•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
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