The canals were prepared using flexoreamers in continuous rotation and with balanced force technique. As the biggest flexoreamer size is 40, nr. 45 and 50 NiTiflex K-files were used at the end of the preparation with balanced force technique. Hedstroem files were used in addition to help in cleaning and shaping the middle and coronal portions of the canals. The canals were constantly irrigated with 0.5 % sodium hypochorite. At the end of the preparation the canal was irrigated with 17 % neutral EDTA and dried with large paper points.