Dagna Alberto, Poggio Claudio, Beltrami Riccardo, Colombo Marco, Chiesa Marco, Bianchi Stefano
Department of Clinical, Surgical, Diagnostic and Pediatric Sciences-Section of Dentistry, University of Pavia, Pavia, Italy.
Department of Occupational Medicine, Ergonomy and Disability, Laboratory of Nanotechnology, Salvatore Maugeri Foundation IRCCS, Pavia, Italy.
J Conserv Dent. 2014 May;17(3):250-4. doi: 10.4103/0972-0707.131788.
The aim of this in vitro study was to evaluate the cyclic fatigue resistance of three single-use nickel-titanium (NiTi) instruments.
Forty files each of OneShape (OS), Reciproc R25 (R25), WaveOne Primary (WO) file, and ProTaper (PT) F2 (as control) were tested in four curved artificial canals with different angles and radii of curvature. The number of cycles to fracture (NCF) was determined and the data were compared for differences by using two-way analysis of variance (P < 0.05).
In general, all single-use instruments were more resistant than traditional rotary instrument used as control. R25 showed the highest cyclic fatigue resistance. One Shape and WO files showed similar cyclic fatigue resistance values, higher than PT F2.
Within the limitations of this study, it can be concluded that R25 was the most fatigue resistant. OS rotary instruments seem to have good mechanical resistance, similar to NiTi files developed for reciprocating motion.
本体外研究旨在评估三种一次性使用的镍钛（NiTi）器械的抗循环疲劳性能。
分别对40根OneShape（OS）、Reciproc R25（R25）、WaveOne Primary（WO）锉以及ProTaper（PT）F2锉（作为对照）在四条具有不同角度和曲率半径的弯曲人工根管中进行测试。测定折断时的循环次数（NCF），并使用双向方差分析比较数据差异（P<0.05）。
总体而言，所有一次性使用器械的抗循环疲劳性能均优于用作对照的传统旋转器械。R25表现出最高的抗循环疲劳性能。One Shape锉和WO锉表现出相似的抗循环疲劳性能值，高于PT F2锉。
在本研究的局限性范围内，可以得出结论，R25的抗疲劳性能最强。OS旋转器械似乎具有良好的机械抗性，类似于为往复运动设计的镍钛锉。
