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Year : 2018  |  Volume : 5  |  Issue : 4  |  Page : 132-138

Micro-computed tomographic comparative evaluation of efficacy of different rotary instrument systems for removal of gutta-percha/bioceramic sealer from oval root canals (in vitro study)

1 Department of Endodontic, Faculty of Oral and Dental Medicine, Cairo University, Cairo, Egypt
2 Department of Oral Diagnostic Science, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia

Correspondence Address:
Samia Mohamed Elsherief
Department of Endodontics, Faculty of Oral and Dental Medicine, Cairo University, Cairo; Faculty of Dentistry, Um-Alqura University, Mecca
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/jdrr.jdrr_52_18

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Aim: This study used micro-computed tomography (CT) to compare the efficacy of three techniques for removing the root canal filling in single oval-shaped root canals after using laterally compacted gutta-percha/bioceramic sealer (BCS). Materials and Methods: Root canals in 30 single-rooted teeth will be instrumented with the ProTaper NEXT (Dentsply Maillefer, Ballaigues, Switzerland) and obturated using lateral condensation technique with gutta-percha and BCS. The teeth were divided randomly into three groups (n = 10). Removal of the root fillings was performed using one of the following techniques: group 1: ProTaper Universal Retreatment System with continuous rotational motion (RM); Group 2: Reciproc files with reciprocating adaptive motion; and Group 3: retreatment was done using Gates Glidden (GG) drills and H files. The teeth were scanned with CT scans. The percentage of remaining filling material was recorded. The data were analyzed statistically using the one-way ANOVA test and Tukey's post hoc test. Two-way ANOVA was used to study the effect of the interaction of file type and root segment, at a 95% confidence level (P < 0.05). Results: The highest mean value was recorded in the apical that was extremely significantly higher than the coronal and middle segments in all groups. ProTaper and GG groups showed a statistically higher mean value compared to Reciproc (P = 0.023). However, there was no significant difference between ProTaper and GG files. Conclusions: Reciproc file removes more filling materials than ProTaper and GG with H files. Within the limitation of this study, none of the techniques completely removes the filling materials from the large oval root canal.

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