(PR98) Effect of Kinematics and Heat Treatment of Nickel-Titanium Rotary File Systems With Different Irrigation Needles on Apically Extruded Debris

Objective: This study evaluated the amount of apically extruded debris during root canal preparation using Ni-Ti file systems and irrigation needles including a newly introduced Trunatomy irrigation needle. Materials and methods: A total of 108 extracted human mandibular first molars were randomly divided into three groups based on the Ni-Ti file system used: Reciproc (RE), Reciproc Blue (RB), Mtwo (MT). Each group was divided into three subgroups based on the irrigation needle used: Blunt end (BE), Side port (SP) and TruNatomy irrigation needle (TN). The extruded debris during the mesio-buccal root canal preparation was collected through the Myers & Montgomery method. The weight of the debris was calculated by subtracting the mean weight of the tube before the procedure from the mean weight of the tube after the procedure. Two–way ANOVA and Tukey post hoc tests were performed to statistical analysis (p < 0.05).

Results: Two-way ANOVA showed a significant difference in the kind of irrigation needle (p >0.05). The amount of debris was the highest for the TN group and lowest for the SP group. There was no significant difference in the amount of debris among three Ni-Ti file systems (p >0.05). There was no relationship between Ni-Ti file systems and irrigation needle about the amount of debris extrusion.

Conclusion: Within the limitations of this study the type of irrigation needle affected the amount of apically extruded debris during root canal preparation. However, the amount of debris was not affected by Ni-Ti file systems.