ProFile Vortex and Vortex Blue Nickel-Titanium Rotary Instruments after Clinical Use

doi:10.1016/j.joen.2015.02.003

CORC > 北京大学 > 工学院

	ProFile Vortex and Vortex Blue Nickel-Titanium Rotary Instruments after Clinical Use
	Shen Ya ; Zhou Huimin ; Coil Jeffrey M ; Aljazaeri Bassim ; Buttar Rene ; Wang Zhejun ; Zheng Yu-Feng ; Haapasalo Markus
刊名	journal of endodontics
	2015
关键词	Differential scanning calorimetry,ProFile Vortex,Vortex Blue,metallurgical properties,nickel-titanium instrument,torsional failure
DOI	10.1016/j.joen.2015.02.003
英文摘要	The aim of this study was to analyze the incidence and mode of ProFile Vortex and Vortex Blue instrument defects after clinical use in a graduate endodontic program and to examine the impact of clinical use on the instruments' metallurgical properties.A total of 330 ProFile Vortex and 1136 Vortex Blue instruments from the graduate program were collected after each had been used in 3 teeth. The incidence and type of instrument defects were analyzed. The lateral surfaces and fracture surfaces of the fractured files were examined by using scanning electron microscopy. Unused and used instruments were examined by full and partial differential scanning calorimetry.No fractures were observed in the 330 ProFile Vortex instruments, whereas 20 (6.1%) revealed bent or blunt defects. Only 2 of the 1136 Vortex Blue files fractured during clinical use. The cause of fracture was shear stress. The fractures occurred at the tip end of the spirals. Only 1.8% (21 of 1136) of the Vortex Blue files had blunt tips. Austenite-finish temperatures were very similar for unused and used ProFile Vortex files and were all greater than 50°C. The austenite-finish temperatures of used and unused Vortex Blue files (38.5°C) were lower than those in ProFile Vortex instruments (P < .001). However, the transformation behavior of Vortex Blue files had an obvious 2-stage transformation, martensite-to-R phase and R-to-austenite phase. The trends of differential scanning calorimetry plots of unused Vortex Blue instruments and clinically used instruments were very similar.The risk of ProFile Vortex and Vortex Blue instrument fracture is very low when instruments are discarded after clinical use in the graduate endodontic program. The Vortex Blue files have metallurgical behavior different from ProFile Vortex instruments.Copyright ? 2015 American Association of Endodontists. Published by Elsevier Inc. All rights reserved.; SCI(E); PubMed; 0; ARTICLE; markush@dentistry.ubc.ca
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/188153]
专题	工学院
推荐引用方式 GB/T 7714	Shen Ya,Zhou Huimin,Coil Jeffrey M,et al. ProFile Vortex and Vortex Blue Nickel-Titanium Rotary Instruments after Clinical Use[J]. journal of endodontics,2015.
APA	Shen Ya.,Zhou Huimin.,Coil Jeffrey M.,Aljazaeri Bassim.,Buttar Rene.,...&Haapasalo Markus.(2015).ProFile Vortex and Vortex Blue Nickel-Titanium Rotary Instruments after Clinical Use.journal of endodontics.
MLA	Shen Ya,et al."ProFile Vortex and Vortex Blue Nickel-Titanium Rotary Instruments after Clinical Use".journal of endodontics (2015).