Comparative evaluation of canal centring ability and canal transportation during biomechanical preparation using two niti rotary files using cbct:- an invitro study

Aim: To evaluate and compare canal centering ability, apical transportation and amount of dentin removed after root canal instrumentation with different rotary file systems using CBCT.
Method: Thirty mesial canals of lower molars were selected and divided into two experimental groups (n=15) according to the system used: NeolixNeoniti and One Shape. Pre- and post-instrumentation CBCT imaging was performed to measure mesial and distal distance of the dentin walls. The canal centering ability and canal transportation was calculated using the formulae given by Gambill et al. The volume of removed dentine was measured in mm3 for each root canal by subtracting the uninstrumented canal volume from the instrumented canal volume.