Evaluation of Apical Transportation During Calcium Hydroxide Paste Removal Using 2 Different Rotary Systems-invitro study

Abstract

Objectives: This study was done to compare and evaluate incidence of apical transportation during calcium hydroxide paste removal using 2 different rotary systems on 40 degree curved simulated root canal blocks. Materials and Methods: 2 groups (n=15 Group 1- iRace Group 2- ProTaper) of simulated root canals were instrumented till working length. Post instrumentation images were taken under stereomicroscope with corresponding final file inserted into the canal to the working length. Calcium hydroxide paste with iodoform was placed till the working length and removed after 7 days using Master Apical File with copious irrigation. Images were taken under stereomicroscope post calcium hydroxide paste removal with corresponding final file inserted till the working length to assess the incidence of apical transportation. Images were printed and the angle was measured using Schneider’s technique by 3 examiners. Stereomicroscopic images were superimposed using Adobe Photoshop 8 software to observe any deviation in the original path. Results: The mean angle change after rotary instrumentation and calcium hydroxide removal were observed in both groups. Superimposed images showed greater root canal deviation in Group 2 than Group1.