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Title

IN VITRO COMPARISON OF GUTTA-PERCHA REMOVAL WITH H-FILE AND PROTAPER WITH OR WITHOUT CHLOROFORM

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 Start Page 6 | End Page 9

Abstract

 Introduction: Removal of root filling materials is one of the key steps in success of root canal RETREATMENT. The purpose of this study was to evaluate the efficacy of H-FILE and ProTaper with or without CHLOROFORM in the removal of GUTTA-PERCHA during RETREATMENT of mandibular premolars. Materials and Methods: Sixty mandibular premolars with one canal, and curvatures less than 30 degrees were used in this experimental study. They were instrumented with K-files and laterally obturated with condensed GUTTA-PERCHA using AH26 as the sealer and were stored in 100% humidity at 37oC for 2 weeks. The teeth were randomly divided into four groups of 15 teeth each. Removal of GUTTA-PERCHA was performed with H-FILE and ProTaper. All techniques were used with or without CHLOROFORM. The teeth were split longitudinally and the area of remaining GUTTA-PERCHA/sealer on the root canal wall was explored under stereomicroscope. RETREATMENT time duration was also recorded for each sample. Data were analyzed statistically by Two-way ANOVA, t-test and Tukey’s.Results: In all groups, no significant difference was found in remaining GUTTA-PERCHA and sealer with or without using CHLOROFORM, but CHLOROFORM shortened the time of RETREATMENT. ProTaper left significantly less remaining filling materials than H-FILE (P<0.05). RETREATMENT time was significantly different between the studied groups (P<0.001).Conclusion: ProTaper Ni-Ti instruments proved to be more efficient and time-saving devices for removal of GUTTA-PERCHA compared to H-FILE in canals with no or slight curvature.

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