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Article: Fatigue testing of a NiTi rotary instrument. Part 1: Strain-life relationship

TitleFatigue testing of a NiTi rotary instrument. Part 1: Strain-life relationship
Authors
KeywordsBreakage
Failure
Fracture
Low-cycle fatigue
Nickel-titanium
Root canal instrument
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. 612-618 How to Cite?
AbstractAim To examine the fatigue behaviour using a strain-life approach, and to determine the effect of water on the fatigue life of a NiTi rotary instrument. Methodology Instruments of one brand of NiTi engine-file (size 25, ProFile 0.04 and 0.06) were subjected to rotational bending either in air or under water, the number of revolutions to fracture (Nf) being recorded using an optical counter and an electronic break-detection circuit. The effective surface strain amplitude (εa) for each specimen was determined from the curvature of the instrument (on a photograph) and the diameter of the fracture cross-section (from a scanning electron micrograph of the fracture surface). Strain was plotted against fatigue life and the low-cycle fatigue (LCF) region identified. Values were examined using two-way analysis of variance for difference between various instrument-environment combinations. Results A total of 212 instruments were tested. A strain-life relationship typical of metals was found. Nf declined with an inverse power function dependence on εa. A fatigue limit was present at about 0.7% strain. The apparent fatigue-ductility exponent, a material constant for the LCF life of metals, was found to be between -0.45 and -0.55. There was a significant effect of the environmental condition on the LCF life, water being more detrimental than air. Conclusions The fatigue behaviour of NiTi rotary instrument is typical of most metals, provided that the analysis is based on the surface strain amplitude, and showed a high-cycle and a LCF region. The LCF life is adversely affected by water. © 2007 International Endodontic Journal.
Persistent Identifierhttp://hdl.handle.net/10722/154475
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. 612-618en_US
dc.identifier.issn0143-2885en_US
dc.identifier.urihttp://hdl.handle.net/10722/154475-
dc.description.abstractAim To examine the fatigue behaviour using a strain-life approach, and to determine the effect of water on the fatigue life of a NiTi rotary instrument. Methodology Instruments of one brand of NiTi engine-file (size 25, ProFile 0.04 and 0.06) were subjected to rotational bending either in air or under water, the number of revolutions to fracture (Nf) being recorded using an optical counter and an electronic break-detection circuit. The effective surface strain amplitude (εa) for each specimen was determined from the curvature of the instrument (on a photograph) and the diameter of the fracture cross-section (from a scanning electron micrograph of the fracture surface). Strain was plotted against fatigue life and the low-cycle fatigue (LCF) region identified. Values were examined using two-way analysis of variance for difference between various instrument-environment combinations. Results A total of 212 instruments were tested. A strain-life relationship typical of metals was found. Nf declined with an inverse power function dependence on εa. A fatigue limit was present at about 0.7% strain. The apparent fatigue-ductility exponent, a material constant for the LCF life of metals, was found to be between -0.45 and -0.55. There was a significant effect of the environmental condition on the LCF life, water being more detrimental than air. Conclusions The fatigue behaviour of NiTi rotary instrument is typical of most metals, provided that the analysis is based on the surface strain amplitude, and showed a high-cycle and a LCF region. The LCF life is adversely affected by water. © 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.subjectFailure-
dc.subjectFracture-
dc.subjectLow-cycle fatigue-
dc.subjectNickel-titanium-
dc.subjectRoot canal instrument-
dc.subject.meshDental Alloys - Chemistryen_US
dc.subject.meshEquipment Failureen_US
dc.subject.meshMaterials Testing - Methodsen_US
dc.subject.meshNickel - Chemistryen_US
dc.subject.meshRoot Canal Therapy - Instrumentationen_US
dc.subject.meshRotationen_US
dc.subject.meshStress, Mechanicalen_US
dc.subject.meshTitanium - Chemistryen_US
dc.subject.meshWateren_US
dc.titleFatigue testing of a NiTi rotary instrument. Part 1: Strain-life relationshipen_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.1365-2591.2007.01262.xen_US
dc.identifier.pmid17532775en_US
dc.identifier.scopuseid_2-s2.0-34547239216en_US
dc.identifier.hkuros131639-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-34547239216&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume40en_US
dc.identifier.issue8en_US
dc.identifier.spage612en_US
dc.identifier.epage618en_US
dc.identifier.eissn1365-2591-
dc.identifier.isiWOS:000247906000004-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridCheung, GSP=7005809531en_US
dc.identifier.scopusauthoridDarvell, BW=7005953926en_US
dc.identifier.citeulike1451678-

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