Citation Information :
Dhanyakumar NM, Shivanna V, Sharma S. Ex Vivo Evaluation of Endodontic Retreatment Using Four Rotary File Systems and Hand Hedstrom Files in the Removal of Gutta-percha and MTA-based Salicylate Resin Sealer. CODS J Dent 2018; 10 (2):29-34.
Objectives: The aim of this study was to compare and evaluate the efficacy of rotary ProTaper retreatment (PTR) files, ProTaper universal (PTU) files, ProTaper next (PTN) file system, Mtwo retreatment (Mtwo R) files, and hand Hedstrom files in the removal of filling materials from the root canal system of extracted human mandibular first premolars. Materials and methods: Seventy-five human mandibular first premolars were collected, stored, and cleaned. Standardization of all specimens was done to 15 mm length. All specimens were prepared upto F3 size using the PTU file system and obturated with F3 gutta-percha using an mineral trioxide aggregate (MTA) fillapex sealer. After coronal sealing, all teeth were stored for 1 week and then divided into five groups of 15 teeth each based on the retreatment file system used: group I—Hedstrom files, group II—PTR, group III—PTU, group IV—PTN, and group V—Mtwo R. Time taken for retreatment in each group was noted. After retreatment, all teeth were longitudinally sectioned, imaged under stereomicroscope, and scored. Data analysis was done using one-way analysis of variance and Tukey post hoc test. Results: ProTaper retreatment files showed significantly less residual filling material in the coronal third, whereas PTN files showed significantly less residual filling material in the middle and apical third as compared with other file systems. The PTN file system took significantly less time in removing root filling material as compared with other file systems. Conclusion: None of the file systems showed complete removal of root filling material after retreatment. ProTaper retreatment files were most efficient in the coronal third, whereas PTN files were most efficient in the middle and apical third. ProTaper next took the least retreatment time. Clinical significance: Irrespective of the file system used, root filling material is left behind, which may lead to failure of the treatment, and so an efficient retreatment file system is required.
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