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KMID : 0362720190570110672
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Journal of the Korean Dental Association
2019 Volume.57 No. 11 p.672 ~ p.678
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Comparison of mechanical properties of nickel-titanium rotary files: Aurum Blue vs. Aurum Pro
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Kwak Sang-Won
Ha Jung-Hong
Ahn Sang-Mi
Kim Hyeon-Cheol
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Abstract
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AIM: The purpose of this study was to evaluate and compare the torsional fracture resistances, cyclic fatigue resistance, and bending stiffness of two nickel-titanium (NiTi) rotary instruments made of different heat-treated alloy: Aurum Blue (heat-treated) and Aurum Pro (conventional).
Methods: Forty-five Aurum Blue and Aurum Pro NiTi files were selected for the three mechanical tests (n=15). For the torsional resistance test, 3 mm file tip was fixed and the shaft was driven clockwise at 2 rpm until fracture occurred by using a customized device. Cyclic fatigue resistance was evaluated by rotating instruments in artificial canal with dynamic mode. Bending stiffness was tested by observation of the bending moment on attaining a 45° bend. The results were analyzed by student-t tests at a significance level of 95%. The fractured surface of each groups were examined under a scanning electron microscope (SEM).
Results: Aurum Blue showed significantly higher toughness, ultimate strength, distortion angle, and number of cycles to failure than those of Aurum Pro (p < 0.05). However, Aurum Blue and Aurum Pro did not differ significantly in terms of bending stiffness. SEM showed typical topographic appearances of the cyclic fatigue and torsional fracture.
Conclusions: Under the limitations of this study, heat-treated instruments showed higher flexibility and fracture resistances than conventional NiTi instruments.
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KEYWORD
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Endodontic treatment, Nickel-titanium file, Torsional resistance, Cyclic fatigue resistance, Bending stiffness, CM-wire Corresponding
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