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Article: Analysis of defects in ProTaper hand-operated instruments after clinical use

TitleAnalysis of defects in ProTaper hand-operated instruments after clinical use
Authors
Issue Date2007
PublisherElsevier Inc. The Journal's web site is located at http://www.jendodon.com
Citation
Journal of Endodontics, 2007, v. 33 n. 3, p. 287-290 How to Cite?
AbstractThe purpose of this study was to analyze the type and location of defects observed in ProTaper for Hand Use (PHU) instruments after routine clinical use. We analyzed a total of 401 PHUs discarded from an endodontic clinic over a 17-month period. Those failed instruments were examined on the lateral and fractographic surface by scanning electron microscope. Of the 86 PHUs that showed discernible defects, 28 were intact but partially unwound, and 58 were fractured (36 because of shear and 22 from fatigue failure). The primary characteristic of shear failure was the presence of a skewed dimple and/or tear ridge, a typical pattern developed because of a combination of various loads. Nearly 74% of the instruments with defects exhibited shear damage. About three-quarters of the instrument fractures occurred in the apical one-third of the canal, mostly in molars. The results of this study indicated that most PHU instruments fail because of either shear or fatigue. © 2007 American Association of Endodontists.
Persistent Identifierhttp://hdl.handle.net/10722/66355
ISSN
2015 Impact Factor: 2.904
2015 SCImago Journal Rankings: 1.681
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorShen, Yen_HK
dc.contributor.authorBian, Zen_HK
dc.contributor.authorCheung, GSPen_HK
dc.contributor.authorPeng, Ben_HK
dc.date.accessioned2010-09-06T05:45:40Z-
dc.date.available2010-09-06T05:45:40Z-
dc.date.issued2007en_HK
dc.identifier.citationJournal of Endodontics, 2007, v. 33 n. 3, p. 287-290en_HK
dc.identifier.issn0099-2399en_HK
dc.identifier.urihttp://hdl.handle.net/10722/66355-
dc.description.abstractThe purpose of this study was to analyze the type and location of defects observed in ProTaper for Hand Use (PHU) instruments after routine clinical use. We analyzed a total of 401 PHUs discarded from an endodontic clinic over a 17-month period. Those failed instruments were examined on the lateral and fractographic surface by scanning electron microscope. Of the 86 PHUs that showed discernible defects, 28 were intact but partially unwound, and 58 were fractured (36 because of shear and 22 from fatigue failure). The primary characteristic of shear failure was the presence of a skewed dimple and/or tear ridge, a typical pattern developed because of a combination of various loads. Nearly 74% of the instruments with defects exhibited shear damage. About three-quarters of the instrument fractures occurred in the apical one-third of the canal, mostly in molars. The results of this study indicated that most PHU instruments fail because of either shear or fatigue. © 2007 American Association of Endodontists.en_HK
dc.languageengen_HK
dc.publisherElsevier Inc. The Journal's web site is located at http://www.jendodon.comen_HK
dc.relation.ispartofJournal of Endodonticsen_HK
dc.rightsThe Journal of Endodontics. Copyright © Lippincott Williams & Wilkins.en_HK
dc.subject.meshDental Alloysen_HK
dc.subject.meshDental Instrumentsen_HK
dc.subject.meshDental Stress Analysisen_HK
dc.subject.meshEquipment Failure Analysisen_HK
dc.subject.meshHumansen_HK
dc.subject.meshMicroscopy, Electron, Scanningen_HK
dc.subject.meshNickelen_HK
dc.subject.meshRoot Canal Preparation - instrumentationen_HK
dc.subject.meshShear Strengthen_HK
dc.subject.meshTitaniumen_HK
dc.titleAnalysis of defects in ProTaper hand-operated instruments after clinical useen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0099-2399&volume=33&issue=3&spage=287&epage=290&date=2007&atitle=Analysis+of+defects+in+ProTaper+hand-operated+instruments+after+clinical+useen_HK
dc.identifier.emailCheung, GSp:spcheung@hkucc.hku.hken_HK
dc.identifier.authorityCheung, GSp=rp00016en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.joen.2006.09.009en_HK
dc.identifier.pmid17320716-
dc.identifier.scopuseid_2-s2.0-33847081737en_HK
dc.identifier.hkuros126613en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-33847081737&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume33en_HK
dc.identifier.issue3en_HK
dc.identifier.spage287en_HK
dc.identifier.epage290en_HK
dc.identifier.isiWOS:000244586500018-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridShen, Y=7404767171en_HK
dc.identifier.scopusauthoridBian, Z=7103314705en_HK
dc.identifier.scopusauthoridCheung, GSP=7005809531en_HK
dc.identifier.scopusauthoridPeng, B=7102873002en_HK

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