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Manufacturing and marketing nickel-titanium (NiTi) rotary instruments became feasible in the early 1990s. Despite their advantages, NiTi instruments may fracture inside the root canal without any sign.[1] Cyclic fatigue and torsional fatigue are the main mechanisms of the fracture of NiTi instruments.[2] Torsional failure occurs when part of the instrument binds to the dentin.[3] Cyclic fatigue fracture of the instrument occurs when the instrument rotates freely in a curvature, generating tension/compression cycles in the region of the maximum flexure until fracture occurs.[1]

Comparison of cyclic fatigue resistance and shaping ability between two single-file reciprocating systems in curved canals