A MICRO-COMPUTER TOMOGRAPHIC COMPARISON QUALITY OF ROOT CANAL FILLING MATERIAL REMOVAL OF BIOCERAMIC SEALER USING DIFFERENT NI-TI ROTARY SYSTEMS

Abstract

Currently, the use of bioceramic sealers are increased in endodontic treatment due to its good properties. However, this sealer was difficult to remove in endodontic retreatment. The purpose of this study was to compare root canal filling material removal quality of 4 different rotary systems and the time required for gutta-percha and sealer removal. Twenty-four human mandibular premolars with single and straight root canal were instrumented up to #25.06 with Protaper Next and obturated using matched-taper size-cone technique. The teeth were divided into 4 groups (n=6) according to the system used for filling removal group: group 1: Mtwo Retreatment (MTR), group 2: WaveOne Gold (WG), group 3: Hyflex EDM (HE) and group 4: TF adaptive (TF) with time recording. Micro-CT scans were taken after obturation and retreatment for the residual filling material volume analysis. The result shows all teeth examined had filling remnants within the canal less than 1%. No statistically significant difference (p > .05) in residual filling material was observed among the group. The retreatment time of MTR was a significant difference from TF (p < .05) but no significant difference from WG and HE (p > .05). It was concluded from this study that four different systems were able to remove the filling material up to 99 percent, with no different in the volume of the remaining filling material.