Quantitative evaluation of apically extruded debris with Twisted File Adaptive instruments in straight root canals: reciprocation with different angles, adaptive motion and continuous rotation

AimTo evaluate the influence of movement kinematics when using Twisted File Adaptive instruments (SybronEndo, Orange, CA, USA) (TF Adaptive) on the amount of apically extruded debris. MethodologyForty-eight extracted mandibular incisor teeth were selected. The teeth were randomly divided into four groups (n?12), and the root canals were instrumented using the following movement kinematics: TF Adaptive motion, 90 degrees clockwise (CW) to 30 degrees counterclockwise (CCW) reciprocating motion, 150 degrees CW to 30 degrees CCW reciprocating motion or continuous rotation. TF Adaptive instruments were used for all groups. Debris extruded apically during instrumentation was collected in pre-weighed Eppendorf tubes, andafter drying, the mean weight of the debris was assessed with an electronic balance. The data were analysed statistically using a one-way analysis of variance. ResultsThe 90 degrees CW to 30 degrees CCW reciprocating motion produced the highest mean extrusion value, and this was significantly greater when compared with continuous rotation (P<0.05). 150 degrees CW to 30 degrees CCW reciprocating, adaptive and continuous rotation motions produced similar amounts of debris extrusion (P>0.05). ConclusionMovement kinematics affected the amount of apically extruded debris when using Twisted File Adaptive instruments.