Dynamic cyclic fatigue resistance of NiTi instruments in a double-curved stainless steel canal with variable distances of displacement

The present study aimed to measure the number of cycles fracture (NCF) different instruments using pecking motion at constant and varying distances movement body temperature. This included 20 files from each brand: ProTaper Universal F2, Next X2, WaveOne Gold Primary (Dentsply Sirona, Maillefer, Ballaigues, Switzerland). Instruments brand were divided into two groups (ten for group) that experienced or variable in a stainless-steel artificial double-curved canal platform ensured instrument rotated stable temperature with minimum fluctuation environment. While running, was programmatically controlled move any desired distance displacement simulate clinical distances. proprietary programs. times recorded then transformed (NCF). Data analyzed Minitab proper tests. All fragments observed under scanning electron microscope capture describe characteristics surface. had highest NCF, while lowest NCF. manufacturer brands modes experimental showed interactive effects. surface revealed no striation. A new design, material, mode rotation, have certain effects on cyclic fatigue resistance instrument.