ProFile Vortex Instruments after Clinical Use: A Metallurgical   Properties Study

doi:10.1016/j.joen.2012.09.018

CORC > 北京大学 > 工学院

	ProFile Vortex Instruments after Clinical Use: A Metallurgical Properties Study
	Shen, Ya ; Coil, Jeffrey M. ; Zhou, Hui-min ; Tam, Esther ; Zheng, Yu-feng ; Haapasalo, Markus
刊名	journal of endodontics
	2012
关键词	Defect differential scanning calorimetry endodontic instrument M-Wire nickel-titanium instrument ProFile Vortex x-ray diffraction NICKEL-TITANIUM INSTRUMENTS ROTARY ENDODONTIC INSTRUMENTS MECHANICAL-PROPERTIES DEFECTS FATIGUE ALLOY WIRE NITINOL SURFACE IMPACT
DOI	10.1016/j.joen.2012.09.018
英文摘要	Introduction: The aim of the study was to analyze the incidence and mode of ProFile Vortex instrument (Dentsply Tulsa Dental Specialties, Tulsa, OK) defects during a predefined schedule of clinical use by the undergraduate students in a dental school setting and to examine the metallurgical characteristics of unused and clinically used Vortex instruments. Methods: A total of 2,203, ProFile Vortex instruments discarded after single use from the undergraduate students program over 24 months were collected and examined for defects using a stereomicrosocpe at 10x magnification. The incidence and type of instrument defects or separation were analyzed. The lateral surfaces of part of the defected instruments and fracture surfaces of fractured files were examined using scanning electron microscopy. Unused and clinically used files were examined by differential scanning calorimetry and X-ray diffraction. Vickers hardness of the files was measured with a 200-g load. Results: Only 1 of the 2,203 files fractured during clinical use. The cause of fracture was shear stress, and the file also showed unwinding of the helix structure. None of the remaining 2,202 files exhibited unwinding after clinical use. Blunt apicals were detected in 86 used files (3.9%). Austenite-finish temperatures were very similar for as-received, used files with defects and used files without defects, all exceeding 50 degrees C. No difference in microhardness was detected among these 3 instrument groups. X-ray diffraction results showed that NiTi files had austenite structure at room temperature. Conclusions: The risk of ProFile Vortex fracture is very low when files are used 1 time by undergraduate students. Unwinding of the files was not detected except for the fractured file. Clinical single use had no detectable effect on austenite-martensite phase transformation of the files. Unused and clinical single-use files contain a similar phase structure at body temperature. (J Endod 2012;38:1613-1617); Dentistry, Oral Surgery & Medicine; SCI(E); 8; ARTICLE; 12; 1613-1617; 38
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/228808]
专题	工学院
推荐引用方式 GB/T 7714	Shen, Ya,Coil, Jeffrey M.,Zhou, Hui-min,et al. ProFile Vortex Instruments after Clinical Use: A Metallurgical Properties Study[J]. journal of endodontics,2012.
APA	Shen, Ya,Coil, Jeffrey M.,Zhou, Hui-min,Tam, Esther,Zheng, Yu-feng,&Haapasalo, Markus.(2012).ProFile Vortex Instruments after Clinical Use: A Metallurgical Properties Study.journal of endodontics.
MLA	Shen, Ya,et al."ProFile Vortex Instruments after Clinical Use: A Metallurgical Properties Study".journal of endodontics (2012).