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Article: Defects in Nickel-Titanium Instruments after Clinical Use. Part 4: An Electropolished Instrument

TitleDefects in Nickel-Titanium Instruments after Clinical Use. Part 4: An Electropolished Instrument
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. 2, p. 197-201 How to Cite?
AbstractThis study aimed to examine the type and location of defects observed in one brand of electropolished nickel-titanium instruments after routine clinical use. A total of 414 RaCe instruments with structural deformations, discarded from one endodontic clinic during a period of 24 months, were analyzed. The lateral and fracture surfaces of those separated instruments were examined by scanning; the locations of the fractures were recorded. Of all defective instruments, 388 had an area of structural change, and 26 were fractured. The distance from the tip of the instrument to the end of the deformed area was significantly longer in .02 taper instruments than in other tapers (P < 0.01), whereas in .04 instruments the distorted area ended closer to the tip (P < 0.05). In 31% of all fractured instruments, the fragment was 7-8 mm long, more frequently in .04 taper than in others. Most of the fractures were found adjacent to the spiraled sector. Shear fracture was diagnosed for 22 (85%) of all those fractured, whereas fatigue occurred in only 4 instruments (15%) (P < 0.05). There was a marked increase in the amount of defects after the seventh (45.4%) and eighth (100%) use. The results of this study indicated that RaCe instruments commonly exhibited unwinding defects after repeated use, and the most common cause of failure was shear failure. © 2008 American Association of Endodontists.
Persistent Identifierhttp://hdl.handle.net/10722/154558
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:

The authors thank Mr Andre Wong for the technical assistance with the SEM. This research was supported in part by Post-Doctoral Fellowship Awards, Faculty of Dentistry, University of British Columbia, Canada.

References

 

DC FieldValueLanguage
dc.contributor.authorShen, Yen_US
dc.contributor.authorWinestock, Een_US
dc.contributor.authorCheung, GSpen_US
dc.contributor.authorHaapasalo, Men_US
dc.date.accessioned2012-08-08T08:26:10Z-
dc.date.available2012-08-08T08:26:10Z-
dc.date.issued2009en_US
dc.identifier.citationJournal Of Endodontics, 2009, v. 35 n. 2, p. 197-201en_US
dc.identifier.issn0099-2399en_US
dc.identifier.urihttp://hdl.handle.net/10722/154558-
dc.description.abstractThis study aimed to examine the type and location of defects observed in one brand of electropolished nickel-titanium instruments after routine clinical use. A total of 414 RaCe instruments with structural deformations, discarded from one endodontic clinic during a period of 24 months, were analyzed. The lateral and fracture surfaces of those separated instruments were examined by scanning; the locations of the fractures were recorded. Of all defective instruments, 388 had an area of structural change, and 26 were fractured. The distance from the tip of the instrument to the end of the deformed area was significantly longer in .02 taper instruments than in other tapers (P < 0.01), whereas in .04 instruments the distorted area ended closer to the tip (P < 0.05). In 31% of all fractured instruments, the fragment was 7-8 mm long, more frequently in .04 taper than in others. Most of the fractures were found adjacent to the spiraled sector. Shear fracture was diagnosed for 22 (85%) of all those fractured, whereas fatigue occurred in only 4 instruments (15%) (P < 0.05). There was a marked increase in the amount of defects after the seventh (45.4%) and eighth (100%) use. The results of this study indicated that RaCe instruments commonly exhibited unwinding defects after repeated use, and the most common cause of failure was shear failure. © 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.meshDental Alloysen_US
dc.subject.meshDental Instrumentsen_US
dc.subject.meshDental Polishing - Methodsen_US
dc.subject.meshDental Stress Analysisen_US
dc.subject.meshEquipment Failureen_US
dc.subject.meshHumansen_US
dc.subject.meshNickelen_US
dc.subject.meshRoot Canal Preparation - Instrumentationen_US
dc.subject.meshShear Strengthen_US
dc.subject.meshTitaniumen_US
dc.subject.meshTorsion, Mechanicalen_US
dc.titleDefects in Nickel-Titanium Instruments after Clinical Use. Part 4: An Electropolished Instrumenten_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.2008.11.012en_US
dc.identifier.pmid19166772-
dc.identifier.scopuseid_2-s2.0-58249120928en_US
dc.identifier.hkuros159507-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-58249120928&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume35en_US
dc.identifier.issue2en_US
dc.identifier.spage197en_US
dc.identifier.epage201en_US
dc.identifier.isiWOS:000263074700010-
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridShen, Y=7404767171en_US
dc.identifier.scopusauthoridWinestock, E=25959395700en_US
dc.identifier.scopusauthoridCheung, GSp=7005809531en_US
dc.identifier.scopusauthoridHaapasalo, M=7003569249en_US

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