XP-Endo Finisher on Postoperative Pain in Retreatment Cases Using Mtwo R Files

"XP-endo Finisher file will be inserted without rotation into the root canals filled with 2.5% NaOCl and will be activated (800 rpm; torque of 1 N.cm) for~1 min in each canal using slow and gentle 7-8 mm lengthwise movements."

obturation material will be removed using Mtwo R (VDW, Munich, Germany)files attached to an endodontic motor (Ecube, seachin, Korea) with a constant speed of 280 rpm, as suggested by the manufacturer. Mtwo R 25/0.05 will be used to empty the coronal and middle thirds of the root. Mtwo R 15/0.05 will be used to reach the working length.