Citation Information :
Bedi K, Swapnil. Evaluation of Fracture Resistance of Endodontically Treated Teeth after Retreatment with Different Retreatment Files Systems: An In Vitro CBCT Study. World J Dent 2023; 14 (9):809-814.
Aim: To assess residual filling material in the root canals and the tooth's resistance to fracture posttreatment utilizing retreatment files, namely Professional Taper (ProTaper), Mtwo, and NeoEndo.
Materials and methods: A total of 90 human-extracted mandibular premolars with one root and a single canal were selected for this study. Samples were decoronated, followed by chemomechanical preparation, and thereafter, using the lateral compaction method, root canals were obturated. The samples were divided into three groups (n = 30)—retreatment file systems, namely ProTaper, Mtwo, and NeoEndo. All three groups were subjected to cone-beam computed tomography (CBCT) evaluation to assess remnants of obturating material inside the canals, and the same samples were further assessed for fracture resistance using the universal testing machine (UTM). The collected data was then evaluated using statistical analysis using the Kruskal–Wallis and post hoc Bonferroni tests.
Results: There were significant differences among the tested groups in the cervical thirds following statistical analysis (p < 0.05). The last residual material was found using ProTaper R (0.9280 ± 0.39707), followed by NeoEndo R (1.1000 ± 0.29814), and the maximum by Mtwo R (1.3500 ± 0.21904). In terms of fracture resistance after retreatment using ProTaper, Mtwo, and NeoEndo retreatment file systems, no significant differences were observed.
Conclusion: All the tested nickel-titanium (Ni-Ti) retreatment files performed satisfactorily in removing the material from the obturated canals. The filling material could not be entirely removed from any of the file systems. ProTaper R left the least amount of filling material in the cervical third. No statistically significant difference was displayed in terms of the fracture resistance among the respective groups.
Clinical significance: Retreatment is necessary in order to save a tooth that has undergone erroneous root canal treatment. To save time retreatment rotary files are being widely used these days. But these files may weaken the tooth by excessive removal of tooth structure. The current study provides clinically relevant knowledge about the different retreatment file systems available, providing in-depth insight into the effective and efficient management of challenging endodontic retreatment cases.
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