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Influence of environmental temperature, heat-treatment and design on the cyclic fatigue resistance of three generations of a single-file nickel–titanium rotary instrument

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Abstract

The aim of the present study was to evaluate the effect of environmental temperature, heat-treatment*** and design on the cyclic fatigue resistance of OneShape (OS), OneShape new generation (OSNG) and One Curve (OC) NiTi rotary single-file instruments. Cyclic fatigue testing of NiTi instruments was performed in an artificial canal with a 5-mm radius of curvature and a 60° angle of curvature located 5 mm from the tip of the instrument. During the experiment 3 different temperatures were used in a thermostatic bath with electronic and infrared controls: 0°, 20° and 35 °C. Sixty OneShape, 60 OneShape new generation and 60 One Curve instruments were rotated in the artificial canal until fracture occurred and the number of cycles to fracture (NCF) and the length of the fractured fragment (FL) was recorded. Data were analyzed by one-way ANOVA test at the 5% significance level. Fatigue resistance was significantly higher as the environmental temperature decreased, with differences ranging from 61 to 791%. OC instruments were significantly more resistant to cyclic fatigue than OS and OSNG instruments at all the temperatures tested (P < 0.05). There was no significant difference with respect to the length of the fractured file fragments for all the instruments tested at all the temperatures tested (P > 0.05). Within the limitation of the present study, fatigue resistance of the files was significantly increased when the environmental temperature decreased. OC instruments were significantly more resistant to cyclic fatigue than OS and OSNG instruments at all the temperatures tested.

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Acknowledgements

The authors deny any conflicts of interest related to this study.

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Authors and Affiliations

  1. Department of Oral and Maxillo-Facial Science, “Sapienza”-University of Rome, Rome, Italy

    Simone Staffoli & Antonella Polimeni

  2. Department of Health Sciences, Università Magna Graecia, Catanzaro, Italy

    Nicola Maria Grande & Leonzio Fortunato

  3. Private Practice, Grande Plotino and Torsello, Dental Clinic, Rome, Italy

    Gianluca Plotino

  4. Department of Endodontics, Faculty of Dentistry, Istanbul Medeniyet University, Istanbul, Turkey

    Taha Özyürek

  5. Faculty of Dentistry, Department of Endodontics, Medipol University, Istanbul, Turkey

    Mustafa Gündoğar

  6. Istanbul Medeniyet Universitesi, 34956, Fatih Mahallesi, Eski Ankara Asfalti, Orhanli Yerleskesi, Tuzla, Istanbul, Turkey

    Taha Özyürek

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  1. Simone Staffoli
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  2. Nicola Maria Grande
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  3. Gianluca Plotino
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  4. Taha Özyürek
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  5. Mustafa Gündoğar
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  6. Leonzio Fortunato
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  7. Antonella Polimeni
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Correspondence to Taha Özyürek.

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Staffoli, S., Grande, N.M., Plotino, G. et al. Influence of environmental temperature, heat-treatment and design on the cyclic fatigue resistance of three generations of a single-file nickel–titanium rotary instrument. Odontology 107, 301–307 (2019). https://doi.org/10.1007/s10266-018-0399-5

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  • DOI: https://doi.org/10.1007/s10266-018-0399-5

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