Effect of glide path preparation on the apical debris extrusion for three single-file systems

Background. The dentinal debris produced during root canal preparation can be extruded through the apical foramen, which may cause undesired consequences, such as the postoperative inflammation of periapical tissues. Objectives. The aim of the present in vitro study was to evaluate the effect of glide path preparation on apical debris extrusion for the Reciproc (R), (R) , WaveOne Gold (R) (R) and One Curve file systems. Material and methods. A total of 72 mandibular incisors were divided into 6 groups according to the nickel-titanium (NiTi) system used and glide path preparation: group Rp - Reciproc; group Rp-O - Reciproc after glide path preparation; group WG - WaveOne Gold; group WG-O - WaveOne Gold after glide path preparation; group OC - One Curve; and group OC-O - One Curve after glide path preparation. The pre- and post-instrumentation weight of Eppendorf tubes was measured. The pre-weight was subtracted from the post-weight to calculate the amount of apically extruded debris. The data was analyzed using the one-way analysis of variance (ANOVA) with the statistical program PASW Statistics for Windows, v.18.0. Results. No statistically significant differences were found between the single-NiTi file systems with different kinematics in terms of apical debris extrusion, with or without glide path preparation (p p > 0.05). Conclusions. The amount of apically extruded debris was not affected by the kinematics of different single-NiTi file systems. Moreover, creating a glide path had no effect on the apically extruded debris in straight root canals.