Clinical Results

Clinical results from the users of EdgeEndo.

Comparative Study of Cyclic Fatigue Resistance for Six Rotary Instruments with Different Nickel-Titanium Wires

Aug 18, 2016 | Studies, Uncategorized

More Studies Keep Showing EdgeEndo Domination!

EdgeEndo® files continue to be recognized as superior files. Many manufacturers are focused on refining the performance of NiTi. In recent studies conducted by university students and presented at the AAE conference, EdgeFile® was shown to be significantly more resistant to cyclic fatigue. Cyclic fatigue of a NiTi file occurs when the metal blade is subjected to repeated cycles of tension and compression that lead to stress and hardening of the material. In this study the six rotary files were tested for cyclic fatigue in an artificial canal. The survival of the instruments were tested using Weibull reliability test.




Cyclic fatigue occurs due to recurrent tension and compression inside the curved canals that leads to crack formation and propagation that progresses until failure. Many factors affect instrument cyclic fatigue including the type of wire that the instrument is made of, instrument design, instrumentation motion and surface integrity.

The efforts of manufacturers are consistently focused on refining the performance of instruments and increasing their resistance to fracture. Instrument modifications include surface electropolishing, changes in the file design and cross section and the use of reciprocating motions rather than continuous motions.

Recently, Thermal treatment optimizes the microstructure and maximizes the flexibility and resistance to cyclic fatigue of an instrument.

Today, instruments make of controlled memory wires have been introduced to the market and exhibit greater resistance to cyclic fatigue that regular NiTi alloys.




To compare the cyclic fatigue of six rotary instruments with different nickel-titanium (NiTi) wires.




F2 ProTaper Universal® (PT) and ProTaper Gold® (PTG) (Dentsply, Tulsa Dental Specialties, Tulsa OK, USA), C2 EdgeFile® (EF) (EdgeEndo, Albuquerque NM, USA), R25 RECIPROC® (RC) (VDW, Munich, Germany), Primary WaveOne® (WO) (Dentsply, Taillefer, Ballaigues, Switzerland), and #25 OneShape® (OS) (Micro-Mega, Besancon Cedex, France) (n-15 instruments) were tested for cyclic fatigue in an artificial canal with a 6-mm radium and a 45 degree curvature. The artificial canal within a stainless steel block was milled by using laser with the aid of computer program which reproduced the instrument size and taper and preserved the instruments trajectory that was adapted to the parameters selected. Number of cycles to fatigue (NCF) was recorded; the lateral surface and fractured face of segments were examined using scanning electron microscopy (SEM) and the cross sectional area was measured. One-way ANOVAs and Games-Howell tests were utilized for data analysis.




The EdgeFile had significantly greater resistance to cyclic fatigue, followed by the RC, WO, PTG, OS and PT (p<0.05). The WO and RC were significantly more resistant to cyclic fatigue than the PTG, OS, and PT.

No significant difference was found between the OS and the PTG (p<0.05), and the PT exhibited the lowest resistance to cyclic fatigue compared to the other systems (p<0.05).




The EdgeFile® was significantly more resistant to cyclic fatigue and was followed by the RECIPROC, WaveOne, ProTaper Gold, OneShape and ProTaper rotary files.

The improvements to rotary instruments were proven to increase their resistances to cyclic fatigue.

EdgeEndo® FireWire™ NiTi

EdgeEndo® proprietary heat treatment process called FireWire™ has created NiTi unmatched flexibility and resistance to cyclic fatigue. FireWire™ NiTi files provide cyclic fatigue resistance many times greater than other NiTi files. The increased flexibility of Heat treated NiTi allows files to better follow the canal, but EdgeEndo® FireWire™ NiTi does away with shape memory and “Bounce Back” and therefore gives incredible canal contouring capability. Dentin is preserved and canals in apical third are preserved.

*Based on Internal Testing. Click here for testing methodology.

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