Root canal configuration of mandibular first and second premolars in an Iranian population.

Background And Aims: It is critical to have a proper knowledge of the normal anatomy of the pulp and its variations for the success of endodontic treatment. The aim of this study was to determine the canal configuration and the prevalence of C-shaped canals in mandibular first and second premolars in a North-Western Iranian population.

Materials And Methods: A total of 163 extracted mandibular first and 103 mandibular second premolars were injected with India ink and demineralized .