Cyclic fatigue resistance of two nickel-titanium rotary instruments in interrupted rotation

International Endodontic Journal
E PedullàG Lo Giudice

Abstract

To investigate the influence of interrupted rotation on cyclic fatigue of two nickel-titanium rotary instruments. Cyclic fatigue of 300 new ProTaper Next size X1; X2 and Mtwo size 10, .04 taper; size 15, .05 taper; size 20, .06 taper and size 25, .06 taper instruments was tested in continuous or interrupted rotation. Fifty files of the same brand and size were randomly assigned to five groups (n = 10). Group 1 instruments were tested in continuous rotation; groups 2 and 3 in paused rotation for 1 s every 10 or 20 s, respectively; groups 4 and 5 in interrupted rotation for 5 s every 10 or 20 s, respectively. Cyclic fatigue was expressed in time to fracture (TtF) in an artificial canal with 60° angle and 5 mm radius of curvature. The fracture surface was examined with a scanning electron microscope (SEM). Data were evaluated by two-way analysis of variance. Cyclic fatigue of groups 2 and 4 of ProTaper Next X2 and Mtwo size 25, .06 taper was significantly lower than that of group 1 of the same instruments (P < 0.01). ProTaper Next X2 had significantly reduced cyclic fatigue in groups 3 and 5 (P < 0.05). No differences were found by interrupting the rotation for 1 or 5 s in all instruments (P > 0.05). Fatigue of other instruments w...Continue Reading

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Citations

Feb 27, 2018·International Endodontic Journal·H S TopçuoğluH Arslan
Jun 5, 2018·Journal of Investigative and Clinical Dentistry·Hüseyin Sinan TopçuoğluGamze Topçuoğlu
Oct 30, 2018·The Open Dentistry Journal·Massimo AmatoGiuseppe Lo Giudice
Jul 4, 2019·International Endodontic Journal·M HülsmannE Schäfer
Mar 31, 2019·Dentistry Journal·Gabriele CervinoMarco Cicciù
Oct 27, 2018·Brazilian Oral Research·Manoel Damião de Sousa-NetoGraziela Bianchi Leoni
Nov 11, 2020·Australian Endodontic Journal : the Journal of the Australian Society of Endodontology Inc·Eugenio PedullàErnesto Rapisarda
Jul 15, 2021·Australian Endodontic Journal : the Journal of the Australian Society of Endodontology Inc·Eugenio PedullàLuigi Generali

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