2019
DOI: 10.3390/ma12162523
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Abstract: The aim of this study was to investigate the role of the flat-designed surface in improving the resistance to cyclic fatigue by comparing heat-treated F-One (Fanta Dental, Shanghai, China) nickel–titanium (NiTi) rotary instruments and similar prototypes, differing only by the absence of the flat side. The null hypothesis was that there were no differences between the two tested instruments in terms of cyclic fatigue lifespan. A total of 40 new NiTi instruments (20 F-One and 20 prototypes) were tested in the pr… Show more

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Cited by 31 publications
(35 citation statements)
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References 36 publications
(41 reference statements)
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“…Therefore, many other factors can influence mechanical resistance. Data have shown that different cross-sectional designs, tip and taper dimensions, pitch lengths, and operative motions could affect the resistance to both the flexural and torsional stresses [12][13][14]. Additional mass increases the torsional resistance and decreases the fatigue resistance [15].…”
Section: Introductionmentioning
confidence: 99%
“…Therefore, many other factors can influence mechanical resistance. Data have shown that different cross-sectional designs, tip and taper dimensions, pitch lengths, and operative motions could affect the resistance to both the flexural and torsional stresses [12][13][14]. Additional mass increases the torsional resistance and decreases the fatigue resistance [15].…”
Section: Introductionmentioning
confidence: 99%
“…This instrument has a similar S-Shaped cross-sectional design of the M-Two. Moreover, the instrument present a new heat treatment recently produced by the manufacturer the AF-H wire [18]. This, according to manufactured internal studies, ensure a more bendable file and more flexural and torsional resistance compared to other instruments.…”
Section: Discussionmentioning
confidence: 99%
“…The two main causes of intracanal failure of nickel-titanium (NiTi) rotary instruments are cyclic fatigue and torsional stress [1][2][3]. Cyclic fatigue occurs when the endodontic instrument is rotated in a curved canal by repeated compressive and tensile stresses, while torsional failure occurs when a part of the instrument, more frequently the tip, binds in the dentine, gets blocked and motor continues to rotate [4][5][6][7].…”
Section: Introductionmentioning
confidence: 99%