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Article: Dynamic torsional resistance of nickel-titanium rotary instruments

TitleDynamic torsional resistance of nickel-titanium rotary instruments
Authors
KeywordsMachining groove
nickel-titanium rotary file
repetitive load
shear fracture
torsional resistance
Twisted File
Issue Date2010
PublisherElsevier Inc. The Journal's web site is located at http://www.jendodon.com
Citation
Journal Of Endodontics, 2010, v. 36 n. 7, p. 1200-1204 How to Cite?
AbstractIntroduction: The cyclic fatigue of nickel-titanium (NiTi) rotary instruments has been studied extensively, but there is little information available on torsional fracture. Moreover, a clinical repeated locking effect was not considered in previous studies that evaluated torsional resistance of NiTi instruments. Thus, this study was aimed to compare the repetitive torsional resistance of various NiTi instruments with clinical relevance. Materials and Methods: Five brands of NiTi rotary instruments were selected: Twisted File (TF; SybronEndo, Orange, CA) and RaCe systems (FKG Dentaire, La Chaux-de-Fonds, Switzerland), both with an equilateral triangular cross-section, and the ProTaper (Dentsply Maillefer, Ballaignes, Switzerland), Helix (DiaDent, Chongju, Korea), and FlexMaster (VDW, Munchen, Germany), which had a convex triangular cross-section. Five millimeters of the tip of each file was embedded in composite resin block, and uniform torsional stresses (300 rpm, 1.0 N.cm) were applied repetitively by an endodontic motor with auto-stop mode until the file succumbed to torsional failure. The number of load applications leading to fracture was recorded. All fracture surfaces were examined under the SEM. Results were analyzed nonparametrically with α = 0.05. Results: Under the mode of load applications in this study, TF had the lowest and FlexMaster the highest torsional resistance among the groups (p < 0.05). Scanning electron microscopy examination revealed a typical pattern of torsional fracture for TF, RaCe, and ProTaper that was characterized by circular abrasion marks and skewed dimples near the center of rotation. In addition to these marks, Helix and FlexMaster presented a rough, torn-off appearance. Conclusion: It was concluded that files of same cross-sectional design may exhibit different resistance to fracture probably as a result of the manufacturing process. © 2010 American Association of Endodontists.
Persistent Identifierhttp://hdl.handle.net/10722/129073
ISSN
2014 Impact Factor: 3.375
2013 SCImago Journal Rankings: 1.331
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorPark, SYen_HK
dc.contributor.authorCheung, GSPen_HK
dc.contributor.authorYum, Jen_HK
dc.contributor.authorHur, Ben_HK
dc.contributor.authorPark, JKen_HK
dc.contributor.authorKim, HCen_HK
dc.date.accessioned2010-12-23T08:32:05Z-
dc.date.available2010-12-23T08:32:05Z-
dc.date.issued2010en_HK
dc.identifier.citationJournal Of Endodontics, 2010, v. 36 n. 7, p. 1200-1204en_HK
dc.identifier.issn0099-2399en_HK
dc.identifier.urihttp://hdl.handle.net/10722/129073-
dc.description.abstractIntroduction: The cyclic fatigue of nickel-titanium (NiTi) rotary instruments has been studied extensively, but there is little information available on torsional fracture. Moreover, a clinical repeated locking effect was not considered in previous studies that evaluated torsional resistance of NiTi instruments. Thus, this study was aimed to compare the repetitive torsional resistance of various NiTi instruments with clinical relevance. Materials and Methods: Five brands of NiTi rotary instruments were selected: Twisted File (TF; SybronEndo, Orange, CA) and RaCe systems (FKG Dentaire, La Chaux-de-Fonds, Switzerland), both with an equilateral triangular cross-section, and the ProTaper (Dentsply Maillefer, Ballaignes, Switzerland), Helix (DiaDent, Chongju, Korea), and FlexMaster (VDW, Munchen, Germany), which had a convex triangular cross-section. Five millimeters of the tip of each file was embedded in composite resin block, and uniform torsional stresses (300 rpm, 1.0 N.cm) were applied repetitively by an endodontic motor with auto-stop mode until the file succumbed to torsional failure. The number of load applications leading to fracture was recorded. All fracture surfaces were examined under the SEM. Results were analyzed nonparametrically with α = 0.05. Results: Under the mode of load applications in this study, TF had the lowest and FlexMaster the highest torsional resistance among the groups (p < 0.05). Scanning electron microscopy examination revealed a typical pattern of torsional fracture for TF, RaCe, and ProTaper that was characterized by circular abrasion marks and skewed dimples near the center of rotation. In addition to these marks, Helix and FlexMaster presented a rough, torn-off appearance. Conclusion: It was concluded that files of same cross-sectional design may exhibit different resistance to fracture probably as a result of the manufacturing process. © 2010 American Association of Endodontists.en_HK
dc.languageengen_US
dc.publisherElsevier Inc. The Journal's web site is located at http://www.jendodon.comen_HK
dc.relation.ispartofJournal of Endodonticsen_HK
dc.subjectMachining grooveen_HK
dc.subjectnickel-titanium rotary fileen_HK
dc.subjectrepetitive loaden_HK
dc.subjectshear fractureen_HK
dc.subjecttorsional resistanceen_HK
dc.subjectTwisted Fileen_HK
dc.titleDynamic torsional resistance of nickel-titanium rotary instrumentsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0099-2399&volume=36&issue=7&spage=1200&epage=1204&date=2010&atitle=Dynamic+torsional+resistance+of+nickel-titanium+rotary+instruments-
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.2010.02.016en_HK
dc.identifier.pmid20630299-
dc.identifier.scopuseid_2-s2.0-78049264432en_HK
dc.identifier.hkuros177053en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-78049264432&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume36en_HK
dc.identifier.issue7en_HK
dc.identifier.spage1200en_HK
dc.identifier.epage1204en_HK
dc.identifier.isiWOS:000279802000018-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridPark, SY=35747059700en_HK
dc.identifier.scopusauthoridCheung, GSP=7005809531en_HK
dc.identifier.scopusauthoridYum, J=35224391200en_HK
dc.identifier.scopusauthoridHur, B=14056308400en_HK
dc.identifier.scopusauthoridPark, JK=24177865700en_HK
dc.identifier.scopusauthoridKim, HC=35746710200en_HK

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