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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2019.10
- 수록면
- 672 - 678 (7page)
이용수
초록· 키워드
오류제보하기
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.
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.
목차
ABSTRACT
I. 서론
II. 재료 및 방법
III. 결과
V. 고찰
참고문헌
참고문헌 (18)
참고문헌 신청
Thompson SA / 2000 / An overview of nickel-titanium alloys used in dentistry / Int Endod J 33:297~310
Peters OA / 2004 / Current challenges and concepts in the preparation of root canal systems : a review / J Endod 30:559~567
Sattapan B / 2000 / Defects in rotary nickel-titanium files after clinical use / J Endod 26:161~165
Parashos P / 2004 / Factors influencing defects of rotary nickel-titanium endodontic instruments after clinical use / J Endod 30:722~725
Shen Y / 2013 / Current challenges and concepts of the thermomechanical treatment of nickel-titanium instruments / J Endod 39:163~172
Peters OA / 2004 / Current challenges and concepts in the preparation of root canal systems : a review / J Endod 30:559~567
Sattapan B / 2000 / Defects in rotary nickel-titanium files after clinical use / J Endod 26:161~165
Parashos P / 2004 / Factors influencing defects of rotary nickel-titanium endodontic instruments after clinical use / J Endod 30:722~725
Shen Y / 2013 / Current challenges and concepts of the thermomechanical treatment of nickel-titanium instruments / J Endod 39:163~172
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