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	Torsion property and cyclic fatigue fracture behavior of nickel-titanium endodontic instruments
	Zheng, YF ; Li, C ; Huang, C ; Zhao, LC
	2005
关键词	NiTi alloy torsion cyclic fatigue endodontic instrument
英文摘要	The torsion property and rotary fatigue fracture behavior of Smart (R) K file and R reamer made of nickel titanium alloy have been studied by means of Shimadzu Autograph DDS-10T universal tester and man-made cyclic system with curved copper tubes as simulated root canal. The instrument surface and the cyclic fatigue fracture surface have been investigated by optical microscope and scanning electron microscope. Comparing with ANSI/ADA specification no.28, maximum torsion values of both Smart (R) K and R endodontic instruments are satisfied in practice. Tensile stresses on the outer surface of the endodontic instruments play a dominant role in fracture initiation during cyclic fatigue fracture. The cyclic number corresponding to cyclic fatigue fracture decreases with the increase of the instrument size number/ curvature. Smart (R) K- and R endodontic instruments exhibit good ductility characteristics, therefore superior resistance to fracture.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000230426600147&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Engineering, Biomedical; Materials Science, Ceramics; Materials Science, Biomaterials; Materials Science, Composites; SCI(E); CPCI-S(ISTP); 0
语种	英语
内容类型	会议论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/316199]
专题	工学院
推荐引用方式 GB/T 7714	Zheng, YF,Li, C,Huang, C,et al. Torsion property and cyclic fatigue fracture behavior of nickel-titanium endodontic instruments[C]. 见:.

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