The Rubber dam was placed, working field disinfected, and the temporary filling removed. The distal canal was enlarged coronally with #3 Largo bur to the broken instrument. The instrument was then loosened with endodontic ultrasound (Satellec with #25 K-file, power setting at 4 and 7). The loose instrument was removed with a size #45 Hedstroem file. A working length radiograph was taken and the canals were prepared with ProTaper rotary instruments under constant irrigation with NaOCl. The apical canals were finished manually with NiTiflex K-files to sizes #45 (mesial canals) and #55 (distal canal).

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