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Article: Torsional strength and toughness of nickel-titanium rotary files

TitleTorsional strength and toughness of nickel-titanium rotary files
Authors
Issue Date2011
PublisherElsevier Inc. The Journal's web site is located at http://www.jendodon.com
Citation
Journal Of Endodontics, 2011, v. 37 n. 3, p. 382-386 How to Cite?
AbstractIntroduction: The aim of this investigation was to compare torsional strength, distortion angle, and toughness of various nickel-titanium (NiTi) rotary files. Methods: Five NiTi rotary instruments with different cross-sectional geometries were selected: TF and RaCe with equilateral triangle, ProTaper with convex-triangle, ProFile with U-shape, and Mtwo with S-shape. The size 25/.06 taper of TF, RaCe, ProFile, and Mtwo and the ProTaper F1 files were tested, all with the same diameter at D5. A metal mounting block with a cubical hole was constructed in which 5 mm of the file tip was rigidly held in place by filling the mold with a resin composite. The files were subjected to clockwise rotation at 2 rpm in a torsion tester. The torque and angular distortion were monitored until the file failed. The data were compared statistically for the yield and ultimate strengths, plastic hardening period, and toughness. Results: TF and RaCe had significantly lower yield strength than other systems. TF had a significantly lower ultimate strength than other files, whereas Mtwo showed the greatest. ProFile showed the highest distortion angle at break, followed by TF. ProFile also showed the highest toughness value, whereas TF and RaCe both showed a lower toughness value than the others (P < .05). Fractographic examination revealed typical pattern of torsional fracture for all brands, characterized by circular abrasion marks and skewed dimples near the center of rotation. Conclusions: Under the limitations of the present study, the 5 tested NiTi rotary files showed a similar mechanical behavior under torsional load, with a period of plastic deformation before actual torsional breakage but with unequal strength and toughness value. Copyright © 2011 American Association of Endodontists.
Persistent Identifierhttp://hdl.handle.net/10722/154656
ISSN
2015 Impact Factor: 2.904
2015 SCImago Journal Rankings: 1.681
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorYum, Jen_US
dc.contributor.authorCheung, GSPen_US
dc.contributor.authorPark, JKen_US
dc.contributor.authorHur, Ben_US
dc.contributor.authorKim, HCen_US
dc.date.accessioned2012-08-08T08:26:45Z-
dc.date.available2012-08-08T08:26:45Z-
dc.date.issued2011en_US
dc.identifier.citationJournal Of Endodontics, 2011, v. 37 n. 3, p. 382-386en_US
dc.identifier.issn0099-2399en_US
dc.identifier.urihttp://hdl.handle.net/10722/154656-
dc.description.abstractIntroduction: The aim of this investigation was to compare torsional strength, distortion angle, and toughness of various nickel-titanium (NiTi) rotary files. Methods: Five NiTi rotary instruments with different cross-sectional geometries were selected: TF and RaCe with equilateral triangle, ProTaper with convex-triangle, ProFile with U-shape, and Mtwo with S-shape. The size 25/.06 taper of TF, RaCe, ProFile, and Mtwo and the ProTaper F1 files were tested, all with the same diameter at D5. A metal mounting block with a cubical hole was constructed in which 5 mm of the file tip was rigidly held in place by filling the mold with a resin composite. The files were subjected to clockwise rotation at 2 rpm in a torsion tester. The torque and angular distortion were monitored until the file failed. The data were compared statistically for the yield and ultimate strengths, plastic hardening period, and toughness. Results: TF and RaCe had significantly lower yield strength than other systems. TF had a significantly lower ultimate strength than other files, whereas Mtwo showed the greatest. ProFile showed the highest distortion angle at break, followed by TF. ProFile also showed the highest toughness value, whereas TF and RaCe both showed a lower toughness value than the others (P < .05). Fractographic examination revealed typical pattern of torsional fracture for all brands, characterized by circular abrasion marks and skewed dimples near the center of rotation. Conclusions: Under the limitations of the present study, the 5 tested NiTi rotary files showed a similar mechanical behavior under torsional load, with a period of plastic deformation before actual torsional breakage but with unequal strength and toughness value. Copyright © 2011 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 Alloys - Chemistryen_US
dc.subject.meshElastic Modulusen_US
dc.subject.meshEquipment Designen_US
dc.subject.meshEquipment Failureen_US
dc.subject.meshHardnessen_US
dc.subject.meshHumansen_US
dc.subject.meshMaterials Testingen_US
dc.subject.meshMechanical Phenomenaen_US
dc.subject.meshMicroscopy, Electron, Scanningen_US
dc.subject.meshNickel - Chemistryen_US
dc.subject.meshRoot Canal Preparation - Instrumentationen_US
dc.subject.meshRotationen_US
dc.subject.meshStress, Mechanicalen_US
dc.subject.meshSurface Propertiesen_US
dc.subject.meshTitanium - Chemistryen_US
dc.subject.meshTorqueen_US
dc.subject.meshTorsion, Mechanicalen_US
dc.titleTorsional strength and toughness of nickel-titanium rotary filesen_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.2010.11.028en_US
dc.identifier.pmid21329826-
dc.identifier.scopuseid_2-s2.0-79951671380en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-79951671380&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume37en_US
dc.identifier.issue3en_US
dc.identifier.spage382en_US
dc.identifier.epage386en_US
dc.identifier.isiWOS:000288290000016-
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridYum, J=35224391200en_US
dc.identifier.scopusauthoridCheung, GSP=7005809531en_US
dc.identifier.scopusauthoridPark, JK=24177865700en_US
dc.identifier.scopusauthoridHur, B=14056308400en_US
dc.identifier.scopusauthoridKim, HC=35746710200en_US

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