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Objectives: To determine the influence of TF adaptive motion on fatigue resistance and efficacy of gutta-percha removal by retreatment files. Materials and methods: A total of 180 extracted single rooted natural human lower premolar teeth were used. Root canal preparations were completed using Mtwo files and obturated using a thermoplastic technique. The teeth were randomly divided into six groups. Three different retreatment file systems (D race, ProTaper universal retreatment, and TF adaptive files) employed with two different rotary motion of continuous and TF adaptive motion. Efficacy of gutta-percha removal was estimated using radiograph and retreatment files were assessed for deformation or fracture using an operating microscope (1.6x and 2.5x magnification). Data were analyzed using analysis of variance (ANOVA) and Chi-square tests (p < 0.05) in Statistical Package for the Social Sciences (SPSS) version 23.0. Results: ProTaper retreatment files took significantly less time to reach working length. ProTaper retreatment files were able to delete gutta-percha from more number of samples. Both D race and TF adaptive files exhibited fracture. Conclusion: TF adaptive motion did not improve the performance of the retreatment files.

journal of operative dentistry and endodontics

Influences of Continuous Rotation and TF adaptive Motion on the Resistance of Different Retreatment File Systems to Deformation and Fracture: An <i>In Vitro</i> study

Influences of Continuous Rotation and TF adaptive Motion on the Resistance of Different Retreatment File Systems to Deformation and Fracture: An In Vitro study