After creating glide path with #15 k-file, Revo-S (Micro Mega, Besancon, France) instruments were used in sequence as suggested by manufacturer recommendation with a rotational speed of 350 rpm in gentle in-out motion. The torque was adjusted to 2.5 Ncm, and a crown-down approach was selected. Once, the instrument had negotiated to the end of the canal and had rotated freely, it was removed.