Restorative Dentistry and Endodontics

  • 제43권2호
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  • Pages.25.1-25.10
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  • 2018
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  • 2234-7658(pISSN)
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  • 2234-7666(eISSN)
대한치과보존학회 (The Korean Academy of Conservative Dentistry)
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Cyclic fatigue resistance, torsional resistance, and metallurgical characteristics of M3 Rotary and M3 Pro Gold NiTi files

  • 투고 : 2017.09.13
  • 심사 : 2018.02.25
  • 발행 : 2018.05.31
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초록

Objectives: To evaluate the mechanical properties and metallurgical characteristics of the M3 Rotary and M3 Pro Gold files (United Dental). Materials and Methods: One hundred and sixty new M3 Rotary and M3 Pro Gold files (sizes 20/0.04 and 25/0.04) were used. Torque and angle of rotation at failure (n = 20) were measured according to ISO 3630-1. Cyclic fatigue resistance was tested by measuring the number of cycles to failure in an artificial stainless steel canal ($60^{\circ}$ angle of curvature and a 5-mm radius). The metallurgical characteristics were investigated by differential scanning calorimetry. Data were analyzed using analysis of variance and the Student-Newman-Keuls test. Results: Comparing the same size of the 2 different instruments, cyclic fatigue resistance was significantly higher in the M3 Pro Gold files than in the M3 Rotary files (p < 0.001). No significant difference was observed between the files in the maximum torque load, while a significantly higher angular rotation to fracture was observed for M3 Pro Gold (p < 0.05). In the DSC analysis, the M3 Pro Gold files showed one prominent peak on the heating curve and 2 prominent peaks on the cooling curve. In contrast, the M3 Rotary files showed 1 small peak on the heating curve and 1 small peak on the cooling curve. Conclusions: The M3 Pro Gold files showed greater flexibility and angular rotation than the M3 Rotary files, without decrement of their torque resistance. The superior flexibility of M3 Pro Gold files can be attributed to their martensite phase.

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참고문헌

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  2. Torsional Resistance of Two New Heat Treated Nickel Titanium Rotary Instruments: An in Vitro Evaluation vol.20, pp.None, 2018, https://doi.org/10.1590/pboci.2020.156
  3. Assessment of Real-Time Operative Torque during Nickel-Titanium Instrumentation with Different Lubricants vol.10, pp.18, 2020, https://doi.org/10.3390/app10186201
  4. A New Device to Test the Bending Resistance of Mechanical Endodontic Instruments vol.10, pp.20, 2020, https://doi.org/10.3390/app10207215
  5. Impact of Peracetic Acid on the Dynamic Cyclic Fatigue of Heat-Treated Nickel-Titanium Rotary Endodontic Instrument vol.2021, pp.None, 2021, https://doi.org/10.1155/2021/6676005
  6. Influence of shaft length on torsional behavior of endodontic nickel-titanium instruments vol.109, pp.3, 2018, https://doi.org/10.1007/s10266-020-00572-2