Evaluation of postoperative pain and its relationship with different motion kinematics: A Randomized clinical trial

Endodontic postoperative pain is described as a sensation of discomfort following the completion of root canal treatment and is experienced by 25-40% of patients. New thermomechanically treated nickel-titanium (NiTi) alloys and varied kinematics have been incorporated into the manufacture and use of endodontic instruments One RECI files are new heat treated C-wire files introduced into the market by (OR; MicroMega, Besançon, France). The C-wire technology is intended to boost instrument flexibility and centering ability One RECI files have a variable off-centered cross section, starting as a triple helix and progressively changing to an S-shape towards the shank.TruNatomy rotary system (Dentsply Sirona, Ballaigues, Switzerland) is a set of instruments made of a maximum fluted diameter of 0.8-mm,Instruments present a variable taper and an off-centered parallelogram cross-sectional design to preserve the radicular dentin during mechanical preparation, Instruments present a variable taper and an off-centered parallelogram cross-sectional design to preserve the radicular dentin during mechanical preparation.The Twisted File Adaptive (TFA) System (SybronEndo, Orange, CA) is composed of a combined continuous rotation and a reciprocating motion in which the file rotates CW, and depending on the load on the file, it adapts and reverses CCW by coasting in a reciprocating motion Hence, the objective of this randomized clinical trial is to comparatively evaluate the effect of motion kinematics on postoperative pain and healing following primary endodontic treatment using One RECI, TruNatomy and Twisted File Adaptive file systems.