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Please use this identifier to cite or link to this item: http://hdl.handle.net/1843/57157
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dc.creatorTúlio César Modestopt_BR
dc.creatorEufemia Carolina Pelaez Acostapt_BR
dc.creatorPedro Damas Resendept_BR
dc.creatorÉrika Sales Joviano Pereirapt_BR
dc.creatorIsabella Faria da Cunha Peixotopt_BR
dc.creatorVicente Tadeu Lopes Buonopt_BR
dc.creatorAna Cecília Diniz Vianapt_BR
dc.date.accessioned2023-07-28T18:09:14Z-
dc.date.available2023-07-28T18:09:14Z-
dc.date.issued2018-
dc.citation.volume26pt_BR
dc.citation.spage1pt_BR
dc.citation.epage7pt_BR
dc.identifier.doihttps://doi.org/10.1590/1678-7757-2018-0144pt_BR
dc.identifier.issn1678-7765pt_BR
dc.identifier.urihttp://hdl.handle.net/1843/57157-
dc.description.resumoObjective: The aim of this study was to evaluate the influence of torsional preloading on the cyclic flexural fatigue resistance of thermally treated NiTi instruments. Material and Methods: Ten new instruments New Hyflex CM (HF 30.06; Coltene/Whaladent Inc.), Typhoon CM (TYP 30.06; Clinician's Choice Dental Products) and Vortex Blue (VB 30.06; Dentsply Tulsa Dental) were chosen, based on geometry and specific characteristics of the manufacturing process. The new instruments of each system were tested in a bench device to determine their fatigue resistance through mean value of number of cycles to failure (Nf) (Control Group – CG). Another group of 10 new HF, TYP and VB instruments were submitted to 20 cycles of torsional straining between 0° and 180° (Experimental Group – EG) and then submitted to fatigue until rupture under the same conditions of the CG. Tested instruments were examined by scanning electron microscopy (SEM). Data were analyzed using one-way analysis of variance and post hoc Tukey’s test (α=.05). Results: Higher fatigue resistance was accomplished by HF instruments, followed by VB and TYP (p<0.05). During the torsional preloading, the lowest mean torque value was observed for TYP instruments (p<0.05). The torsional preload caused a significant reduction in the Nf values (p<0.05) of about 20%, 39% and 45% for instruments HF, VB and TYP, respectively. Longitudinal cracks, generated during the torsional preloading, were present in VB files, but were not observed in the CM instruments (HF and TYP). Conclusions: In conclusion, the flexural fatigue resistance of thermally treated instruments is diminished after cyclic torsional loading.pt_BR
dc.languageporpt_BR
dc.publisherUniversidade Federal de Minas Geraispt_BR
dc.publisher.countryBrasilpt_BR
dc.publisher.departmentENG - DEPARTAMENTO DE ENGENHARIA METALÚRGICApt_BR
dc.publisher.departmentFAO - DEPARTAMENTO DE ODONTOLOGIA RESTAURADORApt_BR
dc.publisher.initialsUFMGpt_BR
dc.relation.ispartofJournal of Applied Oral Sciencept_BR
dc.rightsAcesso Abertopt_BR
dc.subjectEndodonticspt_BR
dc.subjectDental Instrumentspt_BR
dc.subjectNiTipt_BR
dc.subject.otherEndodontiapt_BR
dc.subject.otherMemóriapt_BR
dc.titleCyclic flexural fatigue resistance of NiTi Controlled Memory and Blue Technology instruments after torsional preloadingpt_BR
dc.typeArtigo de Periódicopt_BR
dc.url.externahttps://www.scielo.br/j/jaos/a/SKdV3YwtWF6cCzRgzdy39Kk/?lang=en#pt_BR
dc.identifier.orcidhttp://orcid.org/0000-0002-2712-9686pt_BR
dc.identifier.orcidhttp://orcid.org/0000-0002-1774-8096pt_BR
dc.identifier.orcidhttp://orcid.org/0000-0003-1830-2704pt_BR
dc.identifier.orcidhttp://orcid.org/0000-0001-5504-6055pt_BR
dc.identifier.orcidhttp://orcid.org/0000-0002-2261-8333pt_BR
dc.identifier.orcidhttp://orcid.org/0000-0002-0574-5218pt_BR
dc.identifier.orcidhttp://orcid.org/0000-0002-5987-0540pt_BR
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