Abstract
ProTaper Universal (PTU), WaveOne (WO), Mtwo (Mtwo), Reciproc (RC) and ProTaper Next (PTN). Three of them with continuous motion (PTU, Mtwo and PTN) and two with reciprocating motion (WO and RC). The proposed null hypothesis was that there were not statistically significant differences in the resistance to cyclic fatigue between these files, according to the study of time and Number of Cycles to Fracture (NCF).
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