Cyclic flexural fatigue resistance of NiTi Controlled Memory and Blue Technology instruments after torsional preloading

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dc.creatorTúlio César Modesto
dc.creatorEufemia Carolina Pelaez Acosta
dc.creatorPedro Damas Resende
dc.creatorÉrika Sales Joviano Pereira
dc.creatorIsabella Faria da Cunha Peixoto
dc.creatorVicente Tadeu Lopes Buono
dc.creatorAna Cecília Diniz Viana
dc.date.accessioned2023-07-28T18:09:14Z
dc.date.accessioned2025-09-09T00:00:15Z
dc.date.available2023-07-28T18:09:14Z
dc.date.issued2018
dc.identifier.doihttps://doi.org/10.1590/1678-7757-2018-0144
dc.identifier.issn1678-7765
dc.identifier.urihttps://hdl.handle.net/1843/57157
dc.languagepor
dc.publisherUniversidade Federal de Minas Gerais
dc.relation.ispartofJournal of Applied Oral Science
dc.rightsAcesso Aberto
dc.subjectEndodontia
dc.subjectMemória
dc.subject.otherEndodontics
dc.subject.otherDental Instruments
dc.subject.otherNiTi
dc.titleCyclic flexural fatigue resistance of NiTi Controlled Memory and Blue Technology instruments after torsional preloading
dc.typeArtigo de periódico
local.citation.epage7
local.citation.spage1
local.citation.volume26
local.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.
local.identifier.orcidhttp://orcid.org/0000-0002-2712-9686
local.identifier.orcidhttp://orcid.org/0000-0002-1774-8096
local.identifier.orcidhttp://orcid.org/0000-0003-1830-2704
local.identifier.orcidhttp://orcid.org/0000-0001-5504-6055
local.identifier.orcidhttp://orcid.org/0000-0002-2261-8333
local.identifier.orcidhttp://orcid.org/0000-0002-0574-5218
local.identifier.orcidhttp://orcid.org/0000-0002-5987-0540
local.publisher.countryBrasil
local.publisher.departmentENG - DEPARTAMENTO DE ENGENHARIA METALÚRGICA
local.publisher.departmentFAO - DEPARTAMENTO DE ODONTOLOGIA RESTAURADORA
local.publisher.initialsUFMG
local.url.externahttps://www.scielo.br/j/jaos/a/SKdV3YwtWF6cCzRgzdy39Kk/?lang=en#

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