Cyclic fatigue resistance of heat-treated nickel-titanium instruments after immersion in sodium hypochlorite and/or sterilization

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dc.contributor.authorPedullà, E.es_ES
dc.contributor.authorBenites, A.es_ES
dc.contributor.authorLa Rosa, G.M.es_ES
dc.contributor.authorPlotino, G.es_ES
dc.contributor.authorGrande N.M.es_ES
dc.contributor.authorRapisarda, E.es_ES
dc.contributor.authorGenerali, L.es_ES
dc.date.accessioned6/22/2022 13:33
dc.date.accessioned2022-09-30T16:49:33Z
dc.date.available6/22/2022 13:33
dc.date.available2022-09-30T16:49:33Z
dc.date.issued2018
dc.description.abstractIntroduction: The purpose of this study was to assess the effects of sodium hypochlorite (NaOCl) immersion and sterilization on the cyclic fatigue resistance of heat-treated nickel-titanium (NiTi) rotary instruments. Methods: Two hundred ten new 25/.06 Twisted Files (TFs; SybronEndo, Orange, CA) and Hyflex CM (Coltene Whaledent, Cuyahoga Falls, OH) files were divided into 7 groups (n = 15) for each brand. Group 1 (control group) included new instruments that were not immersed in NaOCl or subjected to autoclave sterilization. Groups 2 and 3 were composed of instruments dynamically immersed for 3 minutes in 5% NaOCl solution 1 and 3 times, respectively. Groups 4 and 5 consisted of instruments only autoclaved 1 and 3 times, respectively. Groups 6 and 7 recruited instruments that received a cycle of both immersion in NaOCl and sterilization 1 and 3 times, respectively. Instruments were subsequently subjected to a fatigue test. The surface morphology of fractured instruments was studied by field-emission scanning electron microscopy and x-ray energy-dispersive spectrometric (EDS) analyses. The means and standard deviations of the number of cycles to failure (NCF) were calculated and statistically analyzed using 2-way analysis of variance (P < .05). Results: Comparison among groups indicated no significant difference of NCF (P > .05) except for the groups of TFs sterilized 3 times without and with immersion in NaOCl (P < .05). HyFlex CM files exhibited higher cyclic fatigue resistance than TFs when files were sterilized 3 times, independently from immersion in NaOCl (P < .05). EDS analysis showed the presence of an oxide-rich layer on the Hyflex CM files' external surface. No morphologic or chemical differences were found between files of the same brand subjected to different treatments. Conclusions: Repeated cycles of sterilization did not influence the cyclic fatigue of NiTi files except for TFs, which showed a significant decrease of flexural resistance after 3 cycles of sterilization. Immersion in NaOCl did not reduce significantly the cyclic fatigue resistance of all heat-treated NiTi files tested. © 2018 American Association of Endodontists.es_ES
dc.formatapplication/pdfes_ES
dc.identifier.doi10.1016/j.joen.2017.12.011es_ES
dc.identifier.urihttps://doi.org/10.1016/j.joen.2017.12.011
dc.language.isoenges_ES
dc.publisherElsevier Inc.es_ES
dc.rightsinfo:eu-repo/semantics/closedAccesses_ES
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/es_ES
dc.sourceJournal of Endodonticses_ES
dc.subjectDentistryes_ES
dc.subject.ocdehttp://purl.org/pe-repo/ocde/ford#3.02.14es_ES
dc.titleCyclic fatigue resistance of heat-treated nickel-titanium instruments after immersion in sodium hypochlorite and/or sterilizationes_ES
dc.typeinfo:eu-repo/semantics/articlees_ES
dc.type.versioninfo:eu-repo/semantics/publishedVersiones_ES
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