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This study compares the cyclic fatigue resistance of files made of gold technology, such as ProTaper Gold F2 and WaveOne Gold Primary files, and files made of M-Wire technology, such as ProTaper Next X2 and WaveOne files. Materials and Methods: A total of 45 files were used in this study, which were classified into 4 groups. Cyclic fatigue tests were conducted using a cyclic loading testing machine, with an artificial canal made of stainless steel (angle of curvature: 45°; curvature radius: 5 mm). All rotary instruments were allowed to reciprocate and rotate until complete fracture, and the fracture time was recorded in seconds using a stop watch. To prevent human error, the experiments were also video-recorded. Results: Gold-Wire files (WaveOne Gold and ProTaper Gold) demonstrated longer time to fracture than that M-Wire files (WaveOne and ProTaper Next) (P < 0.005). In addition, WaveOne files showed more time to fracture than ProTaper Next files (P < 0.005). Fracture surface evaluation coincide with our results. Conclusions: Under the conditions of this study, the gold alloy files resisted cyclic fatigue better than the M-Wire alloy files, In addition, WaveOne files resist cyclic fatigue better than ProTaper Next files.

Cyclic fatigue and fracture surfaces evaluation of different nickel titanium endodontic files