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Article: Defects in Nickel-Titanium Instruments after Clinical Use. Part 2: Fractographic Analysis of Fractured Surface in a Cohort Study

TitleDefects in Nickel-Titanium Instruments after Clinical Use. Part 2: Fractographic Analysis of Fractured Surface in a Cohort Study
Authors
Issue Date2009
PublisherElsevier Inc. The Journal's web site is located at http://www.jendodon.com
Citation
Journal Of Endodontics, 2009, v. 35 n. 1, p. 133-136 How to Cite?
AbstractThe purpose of this study was to investigate the mode of failure of three brands of nickel-titanium (NiTi) instruments (ProTaper [Dentsply Maillefer, Ballaigues, Switzerland], ProTaper for Hand Use [Dentsply Maillefer], and K3 [SybronEndo, Orange, CA]) that separated during clinical use. A total of 79 fractured instruments were collected from three endodontic clinics over 16 months. The fracture surface of each fragment was examined by scanning electron microscope. Most of the rotary instruments (78% of K3 and 66% of ProTaper) failed because of fatigue fracture, whereas 91% of NiTi hand instruments failed as a result of shear (p < 0.01). The fracture mode of shaping files in rotary ProTaper was different between two different clinics (p < 0.05). All surfaces with fatigue fracture (n = 47) revealed the presence of either one or two crack origins. The vast majority (86%) of K3 fatigue failure had two crack origins that could be found not only at the cutting edge but also at various places along the flute compared with only 28% of ProTaper showing multiple crack origins (p < 0.01). The latter showed one crack origin in 81% of the fatigued shaping files but only 37% for finishing files (p < 0.01). The results of this study indicated that the failure mode of NiTi instruments is related to preparation technique. © 2008 American Association of Endodontists.
Persistent Identifierhttp://hdl.handle.net/10722/154552
ISSN
2015 Impact Factor: 2.904
2015 SCImago Journal Rankings: 1.681
ISI Accession Number ID
Funding AgencyGrant Number
Faculty of Dentistry, University of British Columbia, Canada
Funding Information:

Supported in part by Post-Doctoral Fellowship Awards, Faculty of Dentistry, University of British Columbia, Canada. Address requests to reprints to Dr Markus Haapasalo, Division of Endodontics, Oral Biological and Medical Sciences, UBC Faculty of Dentistry, 2199 Wesbrook Mall, Vancouver, BC, Canada V6T 1Z3. E-mail address: markush@interchange. ubc.ca.

References

 

DC FieldValueLanguage
dc.contributor.authorShen, Yen_US
dc.contributor.authorCheung, GSpen_US
dc.contributor.authorPeng, Ben_US
dc.contributor.authorHaapasalo, Men_US
dc.date.accessioned2012-08-08T08:26:08Z-
dc.date.available2012-08-08T08:26:08Z-
dc.date.issued2009en_US
dc.identifier.citationJournal Of Endodontics, 2009, v. 35 n. 1, p. 133-136en_US
dc.identifier.issn0099-2399en_US
dc.identifier.urihttp://hdl.handle.net/10722/154552-
dc.description.abstractThe purpose of this study was to investigate the mode of failure of three brands of nickel-titanium (NiTi) instruments (ProTaper [Dentsply Maillefer, Ballaigues, Switzerland], ProTaper for Hand Use [Dentsply Maillefer], and K3 [SybronEndo, Orange, CA]) that separated during clinical use. A total of 79 fractured instruments were collected from three endodontic clinics over 16 months. The fracture surface of each fragment was examined by scanning electron microscope. Most of the rotary instruments (78% of K3 and 66% of ProTaper) failed because of fatigue fracture, whereas 91% of NiTi hand instruments failed as a result of shear (p < 0.01). The fracture mode of shaping files in rotary ProTaper was different between two different clinics (p < 0.05). All surfaces with fatigue fracture (n = 47) revealed the presence of either one or two crack origins. The vast majority (86%) of K3 fatigue failure had two crack origins that could be found not only at the cutting edge but also at various places along the flute compared with only 28% of ProTaper showing multiple crack origins (p < 0.01). The latter showed one crack origin in 81% of the fatigued shaping files but only 37% for finishing files (p < 0.01). The results of this study indicated that the failure mode of NiTi instruments is related to preparation technique. © 2008 American Association of Endodontists.en_US
dc.languageengen_US
dc.publisherElsevier Inc. The Journal's web site is located at http://www.jendodon.comen_US
dc.relation.ispartofJournal of Endodonticsen_US
dc.subject.meshCohort Studiesen_US
dc.subject.meshDental Alloysen_US
dc.subject.meshDental Instrumentsen_US
dc.subject.meshDental Stress Analysisen_US
dc.subject.meshEquipment Failure Analysisen_US
dc.subject.meshEquipment Reuseen_US
dc.subject.meshMicroscopy, Electron, Scanningen_US
dc.subject.meshNickelen_US
dc.subject.meshRoot Canal Preparation - Instrumentation - Methodsen_US
dc.subject.meshSurface Propertiesen_US
dc.subject.meshTitaniumen_US
dc.titleDefects in Nickel-Titanium Instruments after Clinical Use. Part 2: Fractographic Analysis of Fractured Surface in a Cohort Studyen_US
dc.typeArticleen_US
dc.identifier.emailCheung, GSp:spcheung@hkucc.hku.hken_US
dc.identifier.authorityCheung, GSp=rp00016en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.joen.2008.10.013en_US
dc.identifier.pmid19084143-
dc.identifier.scopuseid_2-s2.0-57149134929en_US
dc.identifier.hkuros154548-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-57149134929&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume35en_US
dc.identifier.issue1en_US
dc.identifier.spage133en_US
dc.identifier.epage136en_US
dc.identifier.isiWOS:000262140700029-
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridShen, Y=7404767171en_US
dc.identifier.scopusauthoridCheung, GSp=7005809531en_US
dc.identifier.scopusauthoridPeng, B=7102873002en_US
dc.identifier.scopusauthoridHaapasalo, M=7003569249en_US

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