Correlation between cyclic fatigue and the bending properties of nickel titanium endodontic instruments
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概要
- 論文の詳細を見る
The effects of cyclic fatigue on bending properties of NiTi endodontic instruments were investigated. Sixteen Profiles® were divided into two groups (A, and B). The sequence of cantilever bending test and cyclic fatigue test was alternated repeatedly until file separation occurred. In the cyclic fatigue test, the instrument curvature was 19° in group A and 38° in group B. Fractographic examination was performed to determine fracture patterns. In group A, there were significant differences between the bending load values measured before the cyclic fatigue test and the last cantilever bending test before instrument fracture at each deflection (p<0.05). Fractographic examination showed the specific patterns of cyclic fatigue fracture. The stress required to induce martensitic transformation might be reduced due to the softening behavior caused by the cyclic fatigue under the relaxation condition of the superelasticity range (group A). The SEM images were able to display specific patterns indicating cyclic fatigue fracture.
- 日本歯科理工学会の論文
著者
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Suda Hideaki
Pulp Biology And Endodontics Department Of Restorative Sciences Division Of Oral Health Sciences Gra
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Ebihara Arata
Pulp Biology And Endodontics Department Of Restorative Sciences Graduate School Tokyo Medical And De
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Hanawa Takao
Department Of Dental Engineering School Of Dentistry Tokushima University Japan
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SUDA Hideaki
Pulp Biology and Endodontics, Department of Oral Sciences, Medical and Dental Sciences Track, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU)
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PIAO Jindan
Pulp Biology and Endodontics, Department of Oral Sciences, Medical and Dental Sciences Track, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU)
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MIYARA Kana
Pulp Biology and Endodontics, Department of Oral Sciences, Medical and Dental Sciences Track, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU)
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NOMURA Naoyuki
Micro-Powder Processing and Systems, Department of Materials Processing, Graduate School of Engineering, Tohoku University
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EBIHARA Arata
Pulp Biology and Endodontics, Department of Oral Sciences, Medical and Dental Sciences Track, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU)
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HANAWA Takao
Department of Metallic Biomaterials, Division of Biomaterials, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University
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