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Article
Efficacy of ProTaper rotary instruments in removing filling materials during root canal retreatment

Author: Dr. Hikmet A. Sh. Al-Gharrawi . B.D.S., M.Sc. د.حكمت عبد الرحيم
Journal: MUSTANSIRIA DENTAL JOURNAL مجلة المستنصرية لطب الاسنان ISSN: 18138500 Year: 2009 Volume: 6 Issue: 1 Pages: 1-7
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

The aim of the this study was to investigate the efficacy of ProTaper rotary instruments compared to hand instrumentation with Hedstrom files, with and without the 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 canals were utilized in this study. The root canals were prepared using step-back technique and obturated with laterally condensed gutta-percha and sealer cement. The roots randomly divided into four groups with ten specimens each. Removal of gutta-percha was performed using ProTaper and Hedstrom files, both were used with and without the solvent eucalyptol. Both, time taken to reach the working length and time taken to complete removal of gutta-percha were recorded. Statistical analysis of the collected data revealed a highly significant decrease in the working time when ProTaper was used to remove gutta-percha compared with Hedstrom files. A highly significant decrease in the working time was found when eucalyptol was used with ProTaper. No significant difference existed between the treatments using Hedstrom with or without the use of eucalyptol.


Article
Evaluation of apically extruded debris by using hand and rotary Nickel-Titanium instruments

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Abstract

This study evaluated the amount of apical debris, using hand, rotary ProTaper instruments, and rotary ProFile instruments. Forty five of mandibular premolars with single root were randomly divided into three groups. The teeth in all groups were instrumented until reaching the working length, with ProFile, rotary ProTaper and hand PrpTaper instruments. Debris extruded from the apical foramen was collected into preweighed polyethylene vials and the extruded irrigant was evaporated. The weight of the dry extruded debris was established by comparing the pre-and post instrumentation weight of polyethylene vials for each group. All instruments tested produce a measurable amount of debris, a statistically significant difference was observed between ProTaper instruments and ProFile group in term of debris extrusion (P < 0.001). Although ProTaper rotary extruded a relatively higher amount of debris, no statistically significance difference was observed between this type and the ProTaper hand instruments (P > 0.05).

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