Comparative Evaluation of Canal Centering Ability of Single-file Retreatment System vs Multiple-file Retreatment System, with and without Gutta-Percha Solvent: An In Vitro Study
Year: 2025
Type: article
Abstract: Aim: This study aimed to compare the canal centering ability (CCA) of a single-file retreatment system and a multiple-file retreatment system, with and without the use of gutta-percha (GP) solvent.Materials and methods: Twenty extracted human mandibular molars with a canal access angle (CAA) of 20-40° were selected and treated endodontically.Samples were equally distributed into two groups, group I (10): HyFlex Remover, group II (10): ProTaper Universal Retreatment File, with two subgroups of five samples each: With solvent, without solvent.Retreatments were performed according to the manufacturer's instructions.Cone-beam computed tomography (CBCT) was used to evaluate CCA in coronal, apical, and middle thirds.Data were analyzed using an independent Student's t-test (p < 0.05).Results: Group I, with p-values of 0.001 at 3 mm, 0.024 at 6 mm, and 0.041 at 9 mm, showed significantly better centering ability than group II at all levels when xylene was used.Without xylene, both groups performed similarly in the apical and middle thirds, but group I outperformed group II at the coronal third (p = 0.001).Conclusion: HyFlex Remover demonstrated superior CCA across all root canal levels, regardless of solvent use.However, xylene significantly improved the performance of the ProTaper system at the apical and coronal thirds.Clinical significance: Endodontic retreatment poses challenges in maintaining canal anatomy while removing obturating materials.This study was necessary to evaluate the CCA of single-vs multiple-file retreatment systems, with and without solvent use.Findings showed HyFlex Remover maintained superior centering ability, minimized solvent dependence, and provided clinicians with a safer, more reliable option for retreatment.
Authors: Sangkeetha Gnanasekaran, Arasappan Rajakumaran, Rajeswari Kalaiselvam, Mathan Rajan Rajendran, Seshan Rakkesh Ramesh, Manigandan Kuzhanchinathan
Language: English
Subfield: Oral Surgery
Field: Dentistry
Domain: Health Sciences
Open Access status: diamond
OpenAlex ID: W4415990544