Research on Cyclic Fatigue Resistance of Two Kinds of Nickel-titanium Instruments

doi:10.13701/j.cnki.kqyxyj.2021.09.009

Abstract

Abstract: Objective: To evaluate the cyclic fatigue resistance of WaveOne Gold with reciprocating motion and Protaper Next with continuous rotary motion. Methods: Thirty WaveOne Gold Primary and 30 ProTaper Next X2 were tested in a custom-made three-pin device with a 38° curvature and 5-mm radius for cyclic loading. The time to fracture (in seconds) was recorded. The fracture length was measured with a digital caliper in millimeters. The fracture surfaces were examined under the scanning electron microscope. Results: The cyclic fatigue test revealed that WOG Primary took significantly longer time to fracture in contrast with ProTaper Next X2 (P<0.05). There was no difference in the fracture length between two groups. The scanning electron microscopy examination demonstrated typical pattern of cyclic fatigue. Conclusion: WOG composed of new thermal treated alloy with reciprocating motion appeared more resistance to cyclic fatigue resistance than ProTaper Next with continuous rotary motion.

Key words: cyclic fatigue, WaveOne Gold, Protaper Next, reciprocating

TONG Fangli, ZHU Yali, XIE Chengjie, CHEN Lei. Research on Cyclic Fatigue Resistance of Two Kinds of Nickel-titanium Instruments[J]. Journal of Oral Science Research, 2021, 37(9): 810-813.

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