대한치과의사협회지 (The Journal of the Korean dental association)

  • 제57권11호
  • /
  • Pages.672-678
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  • 2019
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  • 0376-4672(pISSN)
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  • 2713-7961(eISSN)
대한치과의사협회 (The Korean Dental Association)
권호 표지

니켈티타늄 전동 파일의 기계적 특성 비교: Aurum Blue vs. Aurum Pro

Comparison of mechanical properties of nickel-titanium rotary files: Aurum Blue vs. Aurum Pro

  • 곽상원 (부산대학교 치의학전문대학원 치과보존학교실) ;
  • 하정홍 (경북대학교 치과대학 치과보존학교실) ;
  • 안상미 (부산대학교 치의학전문대학원 치과보존학교실) ;
  • 김현철 (부산대학교 치의학전문대학원 치과보존학교실)
  • Kwak, Sang Won (Department of Conservative Dentistry, School of Dentistry, Dental Research Institute, Pusan National University) ;
  • Ha, Jung-Hong (Department of Conservative Dentistry, School of Dentistry, Kyungpook National University) ;
  • Ahn, Sang Mi (Department of Conservative Dentistry, School of Dentistry, Dental Research Institute, Pusan National University) ;
  • Kim, Hyeon-Cheol (Department of Conservative Dentistry, School of Dentistry, Dental Research Institute, Pusan National University)
  • 투고 : 2019.09.09
  • 심사 : 2019.09.30
  • 발행 : 2019.10.31
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초록

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.

키워드

과제정보

This study was supported by Clinical Research Grant, Pusan National University Dental Hospital (2018).

참고문헌

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