RCT lower premolar with a deep split

A 30 yo female presented to the clinic due to an irreversible pulpitis on tooth 45. The initial xray showed a deep split. After anesthesia, access cavity was performed in an oval bucco-lingual shape. Shaping and cleaning started by preflaring the common coronal part to remove any interferences. Visibility to the apical part was limited, although using high magnification and illumination with a microscope, so tactile sensation was of great importance. A 10 K file with a directional silicone stop was pre-bent and inserted. The first catch was in the lingual canal; the file taking a DL orientation as verified by the mark on the stop. Pull push motion was applied until the 10 k file could reach the working…