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The aim of this study was to evaluate the difference in the angle of curvature, radius of curvature and canal volume before and after root canal shaping by Protaper and Mtwo rotary systems using spiral computed tomography (spiral CT). 45 colored resin blocks with a single canal and 20° curvature were taken and divided into 3 groups of 15 samples each. Iodine based contrast was injected into the canals and preoperative scanning was done with spiral CT. The canals were prepared with Mtwo in group I, Protaper in group II and group III was kept as a negative control. All the canals were filled with contrast solution and subjected to postoperative scanning. Pre and postoperative images were recorded and compared and statistically analyzed using Digital Imaging and Communications in Medicine (DICOM) software. Group I did not show any change whereas group II showed significant change in the angle and radii of curvature in which the apical canal curvature was straightened. There was no significant difference in the volumetric change of root canal between the

COMPARISON OF CHANGE IN ROOT CANAL ANGLE, RADII OF CURVATURE AND VOLUME BY PROTAPER AND MTWO SYSTEMS USING SPIRAL COMPUTED TOMOGRAPHY