SHAPING ABILITY OF TWO DIFFERENT NICKEL-TITANIUM ROTARY INSTRUMENTS OF TWO DIFFERENTALLOYS (INVITRO STUDY)

Abstract

Summary and conclusion The aim of the present study was to compare the shaping ability of one curve and HyFlex EDM rotary file systems regarding Canal curvature, Canal centering ability and Canal Transportation. Forty human permanent mandibular first molars were selected with mature apices having angles of curvature of the mesiobuccal canals ranging between 20° to 40° degrees from the buccal view. Samples were randomly and equally distributed into two groups each of text according to the system used for mesiobuccal canal preparation Cone beam computed tomography was used to evaluate angle of canal curvature and dentin thickness pre and post instrumentation. Dentin thickness was measured at three different levels 3,6 and 9 mm from the apex at axial view using measuring tool. Canal angle was determined according to scheinder method and Percent of reduction of canal curvature was calculated according to following equation (pre instrumentation measurement-post instrumentation measurment )/(pre instrumentation measurement) x100