Comparison of apical debris extrusion of different generation nickel‑titanium instrument systems

Abstract

Background and Aim: The aim of this study is to evaluate the apical debris extrusion amounts and preparation times of four different nickel‑titanium systems with a similar cross‑section design—Mtwo, RECIPROC, RECIPROC blue, and VDW.ROTATE.

Materials and Methods: Eighty human mandibular central incisors were divided into four equal groups (n = 20). The test apparatus was inserted into an assembly that provided root canal temperature. Preparation times were recorded using a stopwatch, and the amount of extruded debris was collected in pre‑weighed Eppendorf tubes. After drying, the net amount was determined by subtracting the previously measured Eppendorf tube weights from the total weight. Results: The Mtwo had the largest amount of debris, but there was no significant difference among the other groups. The VDW.ROTATE completed the preparation in a significantly shorter time than the RECIPROC blue and Mtwo.

Conclusion: Compared to other files, the Mtwo sequence produced significantly more debris and required significantly more time to complete the whole root canal preparation.