Root canal morphology of the mandibular first premolars in an Iranian population using cross-sections and radiography.

Introduction: Successful endodontic treatment is dependent on a perfect knowledge of normal root canal anatomy and variations from the norm. This study was aimed to investigate the root canal anatomy of mandibular first premolars by both radiography and cross-sectional methods in an Iranian population.

Methods: Two hundred seventeen extracted human mandibular first premolars were used.