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Article: Low-cycle fatigue of rotary NiTi endodontic instruments in hypochlorite solution

TitleLow-cycle fatigue of rotary NiTi endodontic instruments in hypochlorite solution
Authors
KeywordsBreakage
Corrosion fatigue
Failure
Fractographic examination
Fracture
Nickel-titanium
Root canal preparation
Strain-life analysis
Issue Date2008
PublisherElsevier Inc. The Journal's web site is located at http://www.elsevier.com/locate/dental
Citation
Dental Materials, 2008, v. 24 n. 6, p. 753-759 How to Cite?
AbstractObjective: To examine the low-cycle fatigue (LCF) behaviour of NiTi rotary endodontic instruments in aqueous sodium hypochlorite solution. Methods: Four brands of NiTi rotary instrument (n = 179) were subjected to a rotational-bending fatigue test at a rate of 250 rpm until fracture, the instrument being immersed in 1.2% sodium hypochlorite solution. The surface strain amplitude, calculated from the curvature (from a pre-test photograph) and diameter of the fracture cross-section (from SEM photomicrograph) was plotted against the total number of revolutions to failure. An apparent fatigue-ductility exponent was determined from a regression line fitted to the LCF lives for each brand of instrument. All detached fragments were examined fractographically for crack initiation and the extent of crack extension into the cross-section. The values were compared using one-way analysis of variance (ANOVA) or χ2, where appropriate, at α = 0.05. Results: A linear strain-life relationship was obtained for all groups; the apparent fatigue-ductility exponent was similar between various brands (ANOVA, P > 0.05), but not for the number of crack origins (χ2, P < 0.05). There was an inverse, linear relationship between the square root of the extension of the fatigue-crack and the strain amplitude. Significance: NiTi rotary instruments fatigued in hypochlorite shows a strain-life relationship with low-cycle and high-cycle fatigue regions. The LCF behaviour is not affected by the cross-sectional shape of the instrument. There appears to be a critical extent of crack propagation for various surface strain amplitudes leading to final, catastrophic fracture of the instrument. © 2007 Academy of Dental Materials.
Persistent Identifierhttp://hdl.handle.net/10722/65913
ISSN
2015 Impact Factor: 3.931
2015 SCImago Journal Rankings: 1.339
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorCheung, GSPen_HK
dc.contributor.authorDarvell, BWen_HK
dc.date.accessioned2010-09-06T05:42:02Z-
dc.date.available2010-09-06T05:42:02Z-
dc.date.issued2008en_HK
dc.identifier.citationDental Materials, 2008, v. 24 n. 6, p. 753-759en_HK
dc.identifier.issn0109-5641en_HK
dc.identifier.urihttp://hdl.handle.net/10722/65913-
dc.description.abstractObjective: To examine the low-cycle fatigue (LCF) behaviour of NiTi rotary endodontic instruments in aqueous sodium hypochlorite solution. Methods: Four brands of NiTi rotary instrument (n = 179) were subjected to a rotational-bending fatigue test at a rate of 250 rpm until fracture, the instrument being immersed in 1.2% sodium hypochlorite solution. The surface strain amplitude, calculated from the curvature (from a pre-test photograph) and diameter of the fracture cross-section (from SEM photomicrograph) was plotted against the total number of revolutions to failure. An apparent fatigue-ductility exponent was determined from a regression line fitted to the LCF lives for each brand of instrument. All detached fragments were examined fractographically for crack initiation and the extent of crack extension into the cross-section. The values were compared using one-way analysis of variance (ANOVA) or χ2, where appropriate, at α = 0.05. Results: A linear strain-life relationship was obtained for all groups; the apparent fatigue-ductility exponent was similar between various brands (ANOVA, P > 0.05), but not for the number of crack origins (χ2, P < 0.05). There was an inverse, linear relationship between the square root of the extension of the fatigue-crack and the strain amplitude. Significance: NiTi rotary instruments fatigued in hypochlorite shows a strain-life relationship with low-cycle and high-cycle fatigue regions. The LCF behaviour is not affected by the cross-sectional shape of the instrument. There appears to be a critical extent of crack propagation for various surface strain amplitudes leading to final, catastrophic fracture of the instrument. © 2007 Academy of Dental Materials.en_HK
dc.languageengen_HK
dc.publisherElsevier Inc. The Journal's web site is located at http://www.elsevier.com/locate/dentalen_HK
dc.relation.ispartofDental Materialsen_HK
dc.rightsDental Materials. Copyright © Elsevier Inc.en_HK
dc.subjectBreakageen_HK
dc.subjectCorrosion fatigueen_HK
dc.subjectFailureen_HK
dc.subjectFractographic examinationen_HK
dc.subjectFractureen_HK
dc.subjectNickel-titaniumen_HK
dc.subjectRoot canal preparationen_HK
dc.subjectStrain-life analysisen_HK
dc.subject.meshCorrosionen_HK
dc.subject.meshDental Alloys - chemistryen_HK
dc.subject.meshDisinfectants - chemistryen_HK
dc.subject.meshElasticityen_HK
dc.subject.meshEquipment Designen_HK
dc.subject.meshEquipment Failureen_HK
dc.subject.meshHumansen_HK
dc.subject.meshMaterials Testingen_HK
dc.subject.meshMicroscopy, Electron, Scanningen_HK
dc.subject.meshNickel - chemistryen_HK
dc.subject.meshPliabilityen_HK
dc.subject.meshRoot Canal Preparation - instrumentationen_HK
dc.subject.meshRotationen_HK
dc.subject.meshSodium Hypochlorite - chemistryen_HK
dc.subject.meshStress, Mechanicalen_HK
dc.subject.meshSurface Propertiesen_HK
dc.subject.meshTitanium - chemistryen_HK
dc.subject.meshTorqueen_HK
dc.titleLow-cycle fatigue of rotary NiTi endodontic instruments in hypochlorite solutionen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0109-5641&volume=24&spage=753&epage=9&date=2008&atitle=Low-cycle+fatigue+of+rotary+NiTi+endodontic+instruments+in+hypochlorite+solutionen_HK
dc.identifier.emailCheung, GSP: spcheung@hkucc.hku.hken_HK
dc.identifier.emailDarvell, BW: b.w.darvell@hku.hken_HK
dc.identifier.authorityCheung, GSP=rp00016en_HK
dc.identifier.authorityDarvell, BW=rp00007en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.dental.2007.09.004en_HK
dc.identifier.pmid17996288-
dc.identifier.scopuseid_2-s2.0-43049121394en_HK
dc.identifier.hkuros141556en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-43049121394&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume24en_HK
dc.identifier.issue6en_HK
dc.identifier.spage753en_HK
dc.identifier.epage759en_HK
dc.identifier.eissn1879-0097-
dc.identifier.isiWOS:000255961300006-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridCheung, GSP=7005809531en_HK
dc.identifier.scopusauthoridDarvell, BW=7005953926en_HK

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