Authors: G. Plotino, N. M. Grande, L. Testarelli, G. Gambarini
Rubrics: Cyclic fatigue
Keywords: cyclic fatigue
Aim To evaluate the cyclic fatigue resistance of Reciproc and WaveOne instruments in simulated root canals.
Methodology Two groups of 15 NiTi endodontic instruments of identical tip size of 0.25 mm were tested, group A; Reciproc R25 and group B: WaveOne primary. Cyclic fatigue testing was performed in a stainless steel artificial canal manufactured by reproducing the instrument’s size and taper. A simulated root canal with a 60° angle of curvature and 5-mm radius of curvature was constructed for both the instruments tested. The centre of the curvature was 5 mm from the tip of the instrument and the curved segment of the canal was approximately 5 mm in length. The Reciproc instruments were activated using the preset programme specific for the Reciproc instruments, whilst the WaveOne instruments were activated using the preset programme specific for the WaveOne instruments. All instruments were rotated until fracture occurred and the time to fracture (TtF) and the length of the fractured tip were recorded and registered. Means and standard deviations of TtF and fragment length were calculated for each system and data were subjected to Student’s t-test (P < 0.05).
Results A statistically significant difference (P < 0.05) was noted between Reciproc and WaveOne instruments. Reciproc R25 instruments were associated with a significant increase in the mean time to fracture when compared with primary WaveOne instruments (130.8 ± 18.4 vs. 97.8 ± 15.9 s). There was no significant difference (P > 0.05) in the mean length of the fractured fragments between the instruments.
Conclusions RECIPROC instruments were associated with a significantly higher cyclic fatigue resistance than WaveOne instruments.