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Article: Fatigue testing of a NiTi rotary instrument. Part 2: Fractographic analysis

TitleFatigue testing of a NiTi rotary instrument. Part 2: Fractographic analysis
Authors
KeywordsBreakage
Corrosion fatigue
Failure
Nickel-titanium
Root canal preparation
Strain-life analysis
Issue Date2007
PublisherBlackwell Publishing Ltd. The Journal's web site is located at http://www.blackwellpublishing.com/journals/IEJ
Citation
International Endodontic Journal, 2007, v. 40 n. 8, p. 619-625 How to Cite?
AbstractAim To examine the topographic features of the fracture surface of a NiTi instrument after fatigue failure, and to correlate the measurements of some features with the cyclic load. Methodology A total of 212 ProFile rotary instruments were subjected to a rotational-bending test at various curvatures until broken. The fracture surface of all fragments was examined by SEM to identify the crack origins. The crack radius, i.e. extent of the fatigue-crack growth towards the centroid of the cross-section, was also measured, and correlated with the strain amplitude for each instrument. Results All fracture surfaces revealed the presence of one or more crack origins, a region occupied by microscopic striations, and an area with microscopic dimples. The number of specimens showing multiple crack origins was significantly greater in the group fatigued under water than in air (P < 0.05). A linear relationship between the reciprocal of the square root of the crack radius and the strain amplitude was discernible (P < 0.001), the slopes of which were not significantly different for instruments fatigued in air and water. Conclusions The fractographic appearance of NiTi engine-files that had failed because of fatigue is typical of that for other metals. The fatigue behaviour of NiTi instruments is adversely affected by water, not only for the low-cycle fatigue life, but also the number of crack origins. There appears to be a critical extent of crack propagation for various strain amplitudes leading to final rupture (akin to the Griffith's criterion for brittle materials). © 2007 International Endodontic Journal.
Persistent Identifierhttp://hdl.handle.net/10722/154477
ISSN
2015 Impact Factor: 2.842
2015 SCImago Journal Rankings: 2.020
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorCheung, GSPen_US
dc.contributor.authorDarvell, BWen_US
dc.date.accessioned2012-08-08T08:25:32Z-
dc.date.available2012-08-08T08:25:32Z-
dc.date.issued2007en_US
dc.identifier.citationInternational Endodontic Journal, 2007, v. 40 n. 8, p. 619-625en_US
dc.identifier.issn0143-2885en_US
dc.identifier.urihttp://hdl.handle.net/10722/154477-
dc.description.abstractAim To examine the topographic features of the fracture surface of a NiTi instrument after fatigue failure, and to correlate the measurements of some features with the cyclic load. Methodology A total of 212 ProFile rotary instruments were subjected to a rotational-bending test at various curvatures until broken. The fracture surface of all fragments was examined by SEM to identify the crack origins. The crack radius, i.e. extent of the fatigue-crack growth towards the centroid of the cross-section, was also measured, and correlated with the strain amplitude for each instrument. Results All fracture surfaces revealed the presence of one or more crack origins, a region occupied by microscopic striations, and an area with microscopic dimples. The number of specimens showing multiple crack origins was significantly greater in the group fatigued under water than in air (P < 0.05). A linear relationship between the reciprocal of the square root of the crack radius and the strain amplitude was discernible (P < 0.001), the slopes of which were not significantly different for instruments fatigued in air and water. Conclusions The fractographic appearance of NiTi engine-files that had failed because of fatigue is typical of that for other metals. The fatigue behaviour of NiTi instruments is adversely affected by water, not only for the low-cycle fatigue life, but also the number of crack origins. There appears to be a critical extent of crack propagation for various strain amplitudes leading to final rupture (akin to the Griffith's criterion for brittle materials). © 2007 International Endodontic Journal.en_US
dc.languageengen_US
dc.publisherBlackwell Publishing Ltd. The Journal's web site is located at http://www.blackwellpublishing.com/journals/IEJen_US
dc.relation.ispartofInternational Endodontic Journalen_US
dc.rightsInternational Endodontic Journal. Copyright © Blackwell Publishing Ltd.-
dc.subjectBreakage-
dc.subjectCorrosion fatigue-
dc.subjectFailure-
dc.subjectNickel-titanium-
dc.subjectRoot canal preparation-
dc.subjectStrain-life analysis-
dc.subject.meshDental Alloys - Chemistryen_US
dc.subject.meshEquipment Failureen_US
dc.subject.meshNickel - Chemistryen_US
dc.subject.meshRoot Canal Therapy - Instrumentationen_US
dc.subject.meshStress, Mechanicalen_US
dc.subject.meshSurface Propertiesen_US
dc.subject.meshTitanium - Chemistryen_US
dc.subject.meshWater - Adverse Effectsen_US
dc.subject.meshWeight-Bearingen_US
dc.titleFatigue testing of a NiTi rotary instrument. Part 2: Fractographic analysisen_US
dc.typeArticleen_US
dc.identifier.emailCheung, GSP:spcheung@hkucc.hku.hken_US
dc.identifier.emailDarvell, BW:b.w.darvell@hku.hken_US
dc.identifier.authorityCheung, GSP=rp00016en_US
dc.identifier.authorityDarvell, BW=rp00007en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1111/j.1365-2591.2007.01256.xen_US
dc.identifier.pmid17511786-
dc.identifier.scopuseid_2-s2.0-34547312762en_US
dc.identifier.hkuros131642-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-34547312762&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume40en_US
dc.identifier.issue8en_US
dc.identifier.spage619en_US
dc.identifier.epage625en_US
dc.identifier.isiWOS:000247906000005-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridCheung, GSP=7005809531en_US
dc.identifier.scopusauthoridDarvell, BW=7005953926en_US
dc.identifier.citeulike1451677-

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