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Article: Defects in ProTaper S1 instruments after clinical use: Longitudinal examination

TitleDefects in ProTaper S1 instruments after clinical use: Longitudinal examination
Authors
Issue Date2005
PublisherBlackwell Publishing Ltd. The Journal's web site is located at http://www.blackwellpublishing.com/journals/IEJ
Citation
International Endodontic Journal, 2005, v. 38 n. 8, p. 550-557 How to Cite?
AbstractAim: To evaluate defects in ProTaper shaping instrument S1 after a defined schedule of clinical use. Methodology: Among all ProTaper files discarded from an endodontic clinic at a stomatological school in China over a period of 17 months, 122 S1 instruments were collected. They were ultrasonically cleaned, autoclaved and then examined in the laboratory. Any instrument separation was noted; the average length involved was determined. The 0.5 mm region on either side of this length of discarded but intact instruments was examined circumferentially by scanning electron microscope. The region adjacent to the broken end of the fractured instruments was also examined in the same way. Results: One specimen was lost during processing. Of the remaining 121 instruments, 27 were separated with a mean fracture length of 3.67 mm from the tip. Of these, two files showed macroscopically torsional fracture and the others showed signs of flexural fatigue. Only one file that had not fractured showed visible unwinding defects. Examination of the 3.1-4.1 mm region of other unfractured instruments revealed the presence of microcracks, surface debris, pitting and/or wear of their cutting edges. Some debris particles seemed to have been trapped in crack-like structures. Conclusions: Multiple use of ProTaper S1 predisposed the instrument to microcrack formation and wear of the cutting edges. There was a low prevalence of plastic deformation and most ProTaper S1 instruments failed without discernible sign of unwinding of the flutes. Further studies should address the mode of failure and the role of debris particles in the fracture mechanism. © 2005 International Endodontic Journal.
Persistent Identifierhttp://hdl.handle.net/10722/65952
ISSN
2015 Impact Factor: 2.842
2015 SCImago Journal Rankings: 2.020
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorPeng, Ben_HK
dc.contributor.authorShen, Yen_HK
dc.contributor.authorCheung, GSPen_HK
dc.contributor.authorXia, TJen_HK
dc.date.accessioned2010-09-06T05:42:22Z-
dc.date.available2010-09-06T05:42:22Z-
dc.date.issued2005en_HK
dc.identifier.citationInternational Endodontic Journal, 2005, v. 38 n. 8, p. 550-557en_HK
dc.identifier.issn0143-2885en_HK
dc.identifier.urihttp://hdl.handle.net/10722/65952-
dc.description.abstractAim: To evaluate defects in ProTaper shaping instrument S1 after a defined schedule of clinical use. Methodology: Among all ProTaper files discarded from an endodontic clinic at a stomatological school in China over a period of 17 months, 122 S1 instruments were collected. They were ultrasonically cleaned, autoclaved and then examined in the laboratory. Any instrument separation was noted; the average length involved was determined. The 0.5 mm region on either side of this length of discarded but intact instruments was examined circumferentially by scanning electron microscope. The region adjacent to the broken end of the fractured instruments was also examined in the same way. Results: One specimen was lost during processing. Of the remaining 121 instruments, 27 were separated with a mean fracture length of 3.67 mm from the tip. Of these, two files showed macroscopically torsional fracture and the others showed signs of flexural fatigue. Only one file that had not fractured showed visible unwinding defects. Examination of the 3.1-4.1 mm region of other unfractured instruments revealed the presence of microcracks, surface debris, pitting and/or wear of their cutting edges. Some debris particles seemed to have been trapped in crack-like structures. Conclusions: Multiple use of ProTaper S1 predisposed the instrument to microcrack formation and wear of the cutting edges. There was a low prevalence of plastic deformation and most ProTaper S1 instruments failed without discernible sign of unwinding of the flutes. Further studies should address the mode of failure and the role of debris particles in the fracture mechanism. © 2005 International Endodontic Journal.en_HK
dc.languageengen_HK
dc.publisherBlackwell Publishing Ltd. The Journal's web site is located at http://www.blackwellpublishing.com/journals/IEJen_HK
dc.relation.ispartofInternational Endodontic Journalen_HK
dc.rightsInternational Endodontic Journal. Copyright © Blackwell Publishing Ltd.en_HK
dc.subject.meshDental Alloys - chemistryen_HK
dc.subject.meshEquipment Designen_HK
dc.subject.meshEquipment Failureen_HK
dc.subject.meshHumansen_HK
dc.subject.meshLongitudinal Studiesen_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.meshSurface Propertiesen_HK
dc.subject.meshTitanium - chemistryen_HK
dc.titleDefects in ProTaper S1 instruments after clinical use: Longitudinal examinationen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0143-2885&volume=38&spage=550&epage=557&date=2005&atitle=Defects+in+ProTaper+S1+instruments+after+clinical+use:+longitudinal+examinationen_HK
dc.identifier.emailCheung, GSP:spcheung@hkucc.hku.hken_HK
dc.identifier.authorityCheung, GSP=rp00016en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1111/j.1365-2591.2005.00991.xen_HK
dc.identifier.pmid16011774en_HK
dc.identifier.scopuseid_2-s2.0-22544487199en_HK
dc.identifier.hkuros111946en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-22544487199&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume38en_HK
dc.identifier.issue8en_HK
dc.identifier.spage550en_HK
dc.identifier.epage557en_HK
dc.identifier.isiWOS:000230432500009-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridPeng, B=7102873002en_HK
dc.identifier.scopusauthoridShen, Y=7404767171en_HK
dc.identifier.scopusauthoridCheung, GSP=7005809531en_HK
dc.identifier.scopusauthoridXia, TJ=8639066400en_HK
dc.identifier.citeulike254070-

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