Efficacy of Three Different Rotary Ni-Ti Instruments in Removing Gutta Percha during Root Canal Retreatment (In Vitro Study)

Abstract

Background: Although root canal therapy has a high degree of success, it doesn’t always lead to the desired response, and failure may occur. Failure might occur in case of persistence of bacteria in the root canal system as a consequence of insufficient cleaning, inadequate obturation, or when there is coronal leakage. Aim of the work: Our study was conducted to evaluate the efficiency of 3 rotary Ni-Ti retreatment systems which are protaper, Fanta and M3 progold. Remaining amount of guttapercha on canal walls, the time required for retreatment process, number of fractured files, amount of debris extrusion was evaluated. Materials and Methods: The total number of sample was sixty canals in thirty mesial root of lower mandibular first molar type III and was randomly divided into three groups of twenty canals according to retreatment system used. In Group (I) retreatment was done using protaper universal retreatment files. In Group (II) retreatment was done using Fanta AF retreatment files. In Group (III) retreatment was done using M3 Pro gold retreatment files. Results: Protaper retreatment file system was faster than Fanta and M3 progold retreatment file system regarding time required for retreatment with significant difference. Regarding number of fractured instruments three protaper D3 (20 7%) files, 2 Fanta RTR1 (20 7%), 5 M3 progold files 4 M3RT1(20 7%) and 1 M3RT2 (25 8%) were broken. Fanta showed the highest amount of debris extrusion in comparison to protaper and M3 progold retreatment systems with significant difference. Conclusion: Under the circumstances of this study, it can be concluded that fanta and M3 progold file has higher efficiency in removal of root canal filling material than Protaper file, protaper faster in retreatment than Fanta and M3 progold, different root section affects amount of remaining root filling material, M3 progold file system has more broken files than 2 other groups, fanta extrude more debris than protaper and M3 progold.