Mechanical Properties of Controlled Memory and Superelastic   Nickel-Titanium Wires Used in the Manufacture of Rotary Endodontic   Instruments

doi:10.1016/j.joen.2012.07.006

CORC > 北京大学 > 工学院

	Mechanical Properties of Controlled Memory and Superelastic Nickel-Titanium Wires Used in the Manufacture of Rotary Endodontic Instruments
	Zhou, Hui-min ; Shen, Ya ; Zheng, Wei ; Li, Li ; Zheng, Yu-feng ; Haapasalo, Markus
刊名	journal of endodontics
	2012
关键词	Controlled memory endodontic instrument mechanical property nickel-titanium alloy phase transformation INDUCED MARTENSITIC-TRANSFORMATION NEAR-EQUIATOMIC NITI BENDING PROPERTIES METALLURGICAL CHARACTERIZATION CYCLIC FATIGUE SHAPE-MEMORY PHASE-TRANSFORMATION ORTHODONTIC WIRES PROFILE SYSTEMS ALLOY
DOI	10.1016/j.joen.2012.07.006
英文摘要	Introduction; The aim of this study was to investigate the structure and mechanical properties of newly developed controlled memory (CM) nickel-titanium wires used in the manufacture of rotary endodontic instruments. Methods: The composition and the phase transformation behavior of both types of wires were examined by x-ray energy dispersive spectroscopy and differential scanning calorimetry, respectively. Conventional superelastic (SE) nickel-titanium wire was used as a control. The mechanical properties of the wires at selected temperatures (room temperature, 37 degrees C, and 60 degrees C) were evaluated with tensile, cyclic tensile, and cantilever bending tests by using an Instron 3365 universal testing machine. The data of austenitic transformation finishing temperature (A(f)) were analyzed statistically by using 1-way analysis of variance test at a significance level of P < .05. Results: The raw CM wires contained a nickel content of 50.7% +/- 0.5% and possessed a relatively higher Af than SE wires (P < .05). The critical plateau stress and ultimate tensile strength of the CM wires were lower than they were for the SE wires, but the maximum strain before fracture of the CM wires (58.4% +/- 7.5% to 84.7% +/- 6.8%) was more than 3 times higher than it was for SE wires (16.7% +/- 3.8% to 27.5% +/- 5.4%). The maximum strain of the CM wires with a diameter of 1.22 mm tested at room temperature (23 degrees C +/- 2 degrees C) was up to 84% +/- 6.4%. CM wires were not SE at either room temperature or 37 degrees C; however, they exhibited superelasticity when heated to 60 degrees C. Conclusions: The raw CM wires exhibited different phase transformation behavior and mechanical properties when compared with SE wires, attributing to the special heat treatment history of CM wires. This study suggested greater flexibility of endodontic instruments manufactured with CM wires than similar instruments made of conventional SE wires. (J Endod 2012;38:1535-1540); http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000310716600013&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Dentistry, Oral Surgery & Medicine; SCI(E); 10; ARTICLE; 11; 1535-1540; 38
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/230568]
专题	工学院
推荐引用方式 GB/T 7714	Zhou, Hui-min,Shen, Ya,Zheng, Wei,et al. Mechanical Properties of Controlled Memory and Superelastic Nickel-Titanium Wires Used in the Manufacture of Rotary Endodontic Instruments[J]. journal of endodontics,2012.
APA	Zhou, Hui-min,Shen, Ya,Zheng, Wei,Li, Li,Zheng, Yu-feng,&Haapasalo, Markus.(2012).Mechanical Properties of Controlled Memory and Superelastic Nickel-Titanium Wires Used in the Manufacture of Rotary Endodontic Instruments.journal of endodontics.
MLA	Zhou, Hui-min,et al."Mechanical Properties of Controlled Memory and Superelastic Nickel-Titanium Wires Used in the Manufacture of Rotary Endodontic Instruments".journal of endodontics (2012).