Metallurgical Characterization of Controlled Memory Wire Nickel-Titanium   Rotary Instruments

doi:10.1016/j.joen.2011.08.005

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	Metallurgical Characterization of Controlled Memory Wire Nickel-Titanium Rotary Instruments
	Shen, Ya ; Zhou, Hui-min ; Zheng, Yu-feng ; Campbell, Les ; Peng, Bin ; Haapasalo, Markus
刊名	journal of endodontics
	2011
关键词	Calorimetry controlled memory differential scanning microstructure nickel-titanium instrument phase transformation X-RAY-DIFFRACTION ENDODONTIC INSTRUMENTS CLINICAL-USE FATIGUE RESISTANCE FILES DEFECTS SURFACE
DOI	10.1016/j.joen.2011.08.005
英文摘要	Introduction: To improve the fracture resistance of nickel-titanium (NiTi) files, manufacturers have introduced new alloys and developed new manufacturing processes for the fabrication of NiTi files. This study aimed to examine the phase transformation behavior and microstructure of NiTi instruments from a novel controlled memory NiTi wire (CM wire). Methods: Instruments of Endo Sequence (ES), Pro File (PF), Pro File Vortex (Vortex), Twisted Files (IF), Typhoon (TYP), and Typhoon (TM) CM (TYP CM), all size 25/.04, were examined by differential scanning calorimetry (DSC) and x-ray diffraction (XRD). Microstructures of etched instruments were observed by optical microscopy and scanning electron microscopy with x-ray energy-dispersive spectrometric (EDS) analyses. Results: The DSC analyses showed that each segment of the TYP CM and Vortex instruments had an austenite transformation completion or austenite-finish (A(f)) temperature exceeding 37 degrees C, whereas the NiTi instruments made from conventional superelastic NiTi wire (ES, PF, and TYP) and TF had A(f) temperatures substantially below mouth temperature. The higher A(f) temperature of TYP CM instruments was consistent with a mixture of austenite and martensite structure, which was observed at room temperature with XRD. All NiTi instruments had room temperature martensite microstructures consisting of colonies of lenticular features with substantial twinning. EDS analysis indicated that the precipitates in all NiTi instruments were titanium-rich, with an approximate composition of Ti(2)Ni. Conclusions: The TYP CM and Vortex instruments with heat treatment contribute to increase austenite transformation temperature. The CM instrument has significant changes in the phase transformation behavior, compared with conventional superelastic NiTi instruments. (1 Endod 2011;37:1566-1571); Dentistry, Oral Surgery & Medicine; SCI(E); 0; ARTICLE; 11; 1566-1571; 37
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/237927]
专题	工学院
推荐引用方式 GB/T 7714	Shen, Ya,Zhou, Hui-min,Zheng, Yu-feng,et al. Metallurgical Characterization of Controlled Memory Wire Nickel-Titanium Rotary Instruments[J]. journal of endodontics,2011.
APA	Shen, Ya,Zhou, Hui-min,Zheng, Yu-feng,Campbell, Les,Peng, Bin,&Haapasalo, Markus.(2011).Metallurgical Characterization of Controlled Memory Wire Nickel-Titanium Rotary Instruments.journal of endodontics.
MLA	Shen, Ya,et al."Metallurgical Characterization of Controlled Memory Wire Nickel-Titanium Rotary Instruments".journal of endodontics (2011).