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The most important requirements for successful endodontic treatment are  accurate diagnosis and good knowledge of canal morphology. A mandibular  second premolars rarely have more than one root and one root canal. Data from  the literature indicate low percentage of a mandibular premolars with three  or more root canals. Unusual morphology of the root canal system is  diagnostic and therapeutic challenge. It is very important to analyze  preoperative radiograph and to explore thoroughly the entrance of the root  canal. The aim of this study was to present two patients who had lower second  premolars with three canals that required endodontic therapy

Endodontic therapy of a mandibular premolar with three root canals: Two case reports