Resistance to Cyclic Fatigue Failure of New Nickel-titanium Rotary Instruments.

doi:10.13701/j.cnki.kqyxyj.2016.05.003

Abstract

Abstract: Objective: To evaluate the cyclic fatigue resistance of rotary endodontic instruments made of traditional or new nickel-titanium (NiTi) alloys. Methods: 30/.06 Hyflex CM, TF, K3XF and K3 were tested in a simulated canal with 60° of curvature and 3-mm radius. The number of rotations until fracture was recorded for each instrument. All fracture surfaces were examined under the SEM. Results: Hyflex CM, TF and K3XF showed a significantly higher resistance to cyclic fatigue than K3. Scanning electron microscopy examination revealed a typical pattern of cyclic fatigue fracture for Hyflex CM, TF, K3XF and K3 that was characterized by fatigue striations and microcrack. Conclusion: Hyflex CM, TF, and K3XF instruments composed of new thermal treated alloy appeared more resistant to cyclic fatigue failure than K3 in a simulated canal model.

CLC Number:

R781.05

ZHAO Dan, PENG Bin.. Resistance to Cyclic Fatigue Failure of New Nickel-titanium Rotary Instruments.[J]. Journal of Oral Science Research, 2016, 32(5): 437-439.

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