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Cyclic Fatigue Evaluation of Nickel-Titanium Rotary Instruments Using an Electrical Resistance-based Method
Congyu Yang1, Yi Min1, Wei Fan1
1State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, Key Laboratory of Oral Biomedicine Ministry of Education, Hubei Key Laboratory of Stomatology, School & Hospital of Stomatology, Wuhan University, Wuhan, Hubei, China.
Journal of Endodontics
|June 28, 2025
Summary
Electrical resistance can predict the cyclic fatigue of nickel-titanium (NiTi) rotary instruments. This method is unaffected by autoclaving, offering a reliable indicator for instrument wear and failure prediction.
Area of Science:
- Endodontics
- Materials Science
- Biomedical Engineering
Background:
- Nickel-titanium (NiTi) rotary instruments are crucial in endodontic procedures.
- Cyclic fatigue is a primary failure mode for NiTi instruments, impacting procedural safety.
- A reliable indicator for assessing NiTi instrument fatigue is needed.
Purpose of the Study:
- To establish the correlation between electrical resistance and cyclic fatigue in NiTi rotary instruments.
- To evaluate electrical resistance as a quantifiable indicator for cyclic fatigue.
- To determine the effect of autoclaving on the electrical resistance of NiTi instruments.
Main Methods:
- Two types of NiTi instruments (ProTaper Universal F2 and ProTaper Gold F2) were subjected to cyclic fatigue testing.
- Electrical resistance was measured during cyclic loading and after simulated use.
- Scanning electron microscopy analyzed microcrack propagation and the impact of autoclaving.
Main Results:
- Electrical resistance demonstrated a quadratic increase with increasing cyclic fatigue.
- Microcrack expansion correlated with increased electrical resistance.
- Autoclaving did not significantly alter the electrical resistance measurements.
Conclusions:
- Electrical resistance serves as a quantifiable and predictive indicator for NiTi rotary instrument cyclic fatigue.
- This electrical resistance method is robust against autoclaving, enhancing its clinical applicability.
- The findings support the use of electrical resistance monitoring for assessing instrument integrity.
