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Related Concept Videos

Fatigue01:21

Fatigue

181
Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
181
Temperature Dependent Deformation01:12

Temperature Dependent Deformation

147
In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
147

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Comparing Cyclic Fatigue Resistance and Free Recovery Transformation Temperature of NiTi Endodontic Single-File

Emad Youssef1,2, Holger Jungbluth1, Søren Jepsen1

  • 1Department of Periodontology, Operative and Preventive Dentistry, University of Bonn, 53111 Bonn, Germany.

Materials (Basel, Switzerland)
|April 9, 2024
PubMed
Summary
This summary is machine-generated.

Body temperature significantly reduces the cyclic fatigue resistance of endodontic single-file systems. This finding highlights the importance of temperature control during root canal procedures to prevent instrument failure.

Keywords:
bend and free recoverycyclic fatiguereciprocating endodontic instruments

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Area of Science:

  • Endodontics
  • Materials Science
  • Biomedical Engineering

Background:

  • Cyclic fatigue resistance is crucial for endodontic file longevity.
  • Nickel-titanium (NiTi) rotary and reciprocating files are commonly used in root canal therapy.
  • Understanding factors affecting file performance, such as temperature, is essential for clinical success.

Purpose of the Study:

  • To evaluate the impact of body temperature (37 °C) on the cyclic fatigue resistance of three different endodontic single-file systems.
  • To compare the performance of One Shape® new generation, WaveOne™, and WaveOne® GOLD files at body temperature versus room temperature.
  • To assess the suitability of the bend and free recovery (BFR) method for determining transformation temperatures of NiTi endodontic instruments.

Main Methods:

  • Three single-file systems (One Shape® new generation, WaveOne™, WaveOne® GOLD) were tested.
  • Cyclic fatigue tests were conducted in artificial canals at 20 °C and 37 °C.
  • A custom-made setup with a heating element simulated body temperature.
  • Transformation temperatures were determined using the bend and free recovery (BFR) method.

Main Results:

  • All tested endodontic file systems exhibited significantly reduced cyclic fatigue life at 37 °C compared to 20 °C (p < 0.05).
  • The WaveOne® GOLD system showed a trend towards less reduction in fatigue life at 37 °C in tighter curves (p = 0.075).
  • Transformation temperatures for all tested file systems were below body temperature.

Conclusions:

  • Body temperature directly and negatively affects the cyclic fatigue resistance of the evaluated endodontic single-file systems.
  • Clinical procedures should consider the influence of body temperature on NiTi file performance to minimize fracture risk.
  • The BFR method is a viable technique for determining the austenite finish temperatures (Af) of endodontic instruments.