Abstract
The aim of the this study was to investigate the efficacy of ProTaper rotaryinstruments compared to hand instrumentation with Hedstrom files, with and withoutthe use of a solvent (eucalyptol) in the retreatment of gutta-percha filled root canals.Roots of forty extracted single-rooted maxillary anterior teeth with straight root canalswere utilized in this study. The root canals were prepared using step-back techniqueand obturated with laterally condensed gutta-percha and sealer cement. The rootsrandomly divided into four groups with ten specimens each. Removal of gutta-perchawas performed using ProTaper and Hedstrom files, both were used with and withoutthe solvent eucalyptol. Both, time taken to reach the working length and time taken tocomplete removal of gutta-percha were recorded. Statistical analysis of the collecteddata revealed a highly significant decrease in the working time when ProTaper wasused to remove gutta-percha compared with Hedstrom files. A highly significantdecrease in the working time was found when eucalyptol was used with ProTaper. Nosignificant difference existed between the treatments using Hedstrom with or withoutthe use of eucalyptol.
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