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Article: Low-cycle fatigue of NiTi rotary instruments of various cross-sectional shapes

TitleLow-cycle fatigue of NiTi rotary instruments of various cross-sectional shapes
Authors
KeywordsBreakage
Fracture
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. 626-632 How to Cite?
AbstractAim To compare the low-cycle fatigue (LCF) behaviour of some commercial NiTi instruments subjected to rotational bending, a deformation mode similar to an engine-file rotating in a curved root canal, using a strain-life analysis, in water. Methodology A total of 286 NiTi rotary instruments from four manufacturers were constrained into a curvature by three rigid, stainless steel pins whilst rotating at a rate of 250 rpm in deionized water until broken. The number of revolutions was recorded using an optical counter and an electronic break-detection circuit. The surface strain amplitude, calculated from the curvature (from a photograph) and diameter of the fracture cross-section (from a scanning electron micrograph), was plotted against the number of cycles to fracture for each instrument. A regression line was fitted to the LCF lives for each brand; the value was compared with that of others using one-way analysis of variance (anova). The number of crack origins observed on the fractographic view was examined with chi-square for differences amongst various groups. Results A linear strain-life relationship, on logarithmic scales, was obtained for the LCF region with an apparent fatigue-ductility exponent ranging from -0.40 to -0.56. The number of crack-initiation sites, as observed on the fracture cross-section, differed between brands (χ2, P < 0.05), but not LCF life (one-way anova, P > 0.05). Conclusions The LCF life of NiTi instruments declines with an inverse power function dependence on surface strain amplitude, but is not affected by the cross-sectional shape of the instrument. © 2007 International Endodontic Journal.
Persistent Identifierhttp://hdl.handle.net/10722/154476
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. 626-632en_US
dc.identifier.issn0143-2885en_US
dc.identifier.urihttp://hdl.handle.net/10722/154476-
dc.description.abstractAim To compare the low-cycle fatigue (LCF) behaviour of some commercial NiTi instruments subjected to rotational bending, a deformation mode similar to an engine-file rotating in a curved root canal, using a strain-life analysis, in water. Methodology A total of 286 NiTi rotary instruments from four manufacturers were constrained into a curvature by three rigid, stainless steel pins whilst rotating at a rate of 250 rpm in deionized water until broken. The number of revolutions was recorded using an optical counter and an electronic break-detection circuit. The surface strain amplitude, calculated from the curvature (from a photograph) and diameter of the fracture cross-section (from a scanning electron micrograph), was plotted against the number of cycles to fracture for each instrument. A regression line was fitted to the LCF lives for each brand; the value was compared with that of others using one-way analysis of variance (anova). The number of crack origins observed on the fractographic view was examined with chi-square for differences amongst various groups. Results A linear strain-life relationship, on logarithmic scales, was obtained for the LCF region with an apparent fatigue-ductility exponent ranging from -0.40 to -0.56. The number of crack-initiation sites, as observed on the fracture cross-section, differed between brands (χ2, P < 0.05), but not LCF life (one-way anova, P > 0.05). Conclusions The LCF life of NiTi instruments declines with an inverse power function dependence on surface strain amplitude, but is not affected by the cross-sectional shape of the instrument. © 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.subjectFracture-
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.meshRotationen_US
dc.subject.meshStress, Mechanicalen_US
dc.subject.meshSurface Propertiesen_US
dc.subject.meshTitanium - Chemistryen_US
dc.titleLow-cycle fatigue of NiTi rotary instruments of various cross-sectional shapesen_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.1365-2591.2007.01257.xen_US
dc.identifier.pmid17459117-
dc.identifier.scopuseid_2-s2.0-34547306412en_US
dc.identifier.hkuros131644-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-34547306412&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume40en_US
dc.identifier.issue8en_US
dc.identifier.spage626en_US
dc.identifier.epage632en_US
dc.identifier.isiWOS:000247906000006-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridCheung, GSP=7005809531en_US
dc.identifier.scopusauthoridDarvell, BW=7005953926en_US
dc.identifier.citeulike1451676-

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