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Cyclic fatigue test was performed until fracture in a custom stainless\u2010steel device with water bath equipment to simulate body temperature. Fracture time was recorded. A number of cycles were calculated. Resistance to bending at 45\u00b0, torsional resistance and angular deflection were evaluated. The fracture surfaces were examined by scanning electron microscopy. Statistical analysis was performed with one\u2010way ANOVA and Tukey and Kruskal\u2013Wallis and Dunn tests. Pro\u2010R and Logic RT presented the highest cyclic fatigue (<jats:italic>P<\/jats:italic>\u00a0&lt;\u00a00.05). D2 had higher strength to bend than Pro\u2010R and Logic RT (<jats:italic>P<\/jats:italic>\u00a0&lt;\u00a00.05). Logic RT showed the highest torque and angular deflection (<jats:italic>P<\/jats:italic>\u00a0&lt;\u00a00.05), without differences when compared to D2 (<jats:italic>P<\/jats:italic>\u00a0&gt;\u00a00.05). Instrument performances were dependent on their geometrical features and heat treatments.<\/jats:p>","DOI":"10.1111\/aej.12474","type":"journal-article","created":{"date-parts":[[2020,12,10]],"date-time":"2020-12-10T17:22:12Z","timestamp":1607620932000},"page":"265-272","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Evaluation of the mechanical properties of different nickel\u2013titanium retreatment instruments"],"prefix":"10.1111","volume":"47","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6810-1877","authenticated-orcid":false,"given":"Theodoro","family":"Weissheimer","sequence":"first","affiliation":[{"name":"Department of Conservative Dentistry Federal University of Rio Grande do Sul Porto Alegre 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