The Effect of Single File Systems on Apical Debris Extrusion During Retreatment: An In Vitro Study

Objective: The aim of this study was to compare the amounts debris extruded apically with use different single file systems during endodontic retreatment. Material and Methods: 36 mandibular premolar teeth were prepared ProTaper Universal files up F3. At every instrument change, root canals irrigated 2 mL 5.25% NaOCl solution. After canal preparation, final irrigation performed using 5 17% EDTA followed by saline. dried paper point filled gutta percha AH Plus sealer. stored at 37 °C 100% humidity for 1 week. Then divided randomly into three groups (n=12) according system used: HyFlex EDM One File, Reciproc Blue File Curve. Debris retreatment collected preweighed Eppendorf tubes. initial weight subtracted from tubes calculate each group. Data analyzed one-way analysis variance post-hoc Tukey tests (p=0.05). Results: significantly more compared Curve (p0.05). Conclusion: Under conditions in vitro study, all instrumentation techniques resulted extrusion. properties may have an effect on amount