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Validated finite element analyses of WaveOne Endodontic Instruments: a comparison between M-Wire and NiTi alloys
N Bonessio1, E S J Pereira, G Lomiento
1Department of Structural Engineering, University of California, San Diego, CA, USA.
International Endodontic Journal
|June 14, 2014
Summary
Finite Element Analysis (FEA) validated WaveOne instrument torsional performance. M-Wire NiTi files showed greater flexibility than conventional NiTi, though fracture resistance offered limited improvement.
Area of Science:
- Endodontics
- Materials Science
- Biomedical Engineering
Background:
- WaveOne instruments are widely used in endodontic treatments.
- Understanding the torsional properties of nickel-titanium (NiTi) rotary instruments is crucial for clinical success and preventing instrument fracture.
- Finite Element Analysis (FEA) offers a powerful tool for simulating mechanical behaviors of dental instruments.
Purpose of the Study:
- To validate FEA models for torsional analysis of WaveOne instruments against in vitro data.
- To model and compare the torsional performance of WaveOne instruments made from M-Wire and conventional NiTi alloys.
Main Methods:
- WaveOne instruments (Small, Primary, Large) were subjected to torsional testing (ISO 3630-1).
- FEA simulations were created using micro-CT scans and validated against experimental torque and angle data.
- FEA was used to compare M-Wire and conventional NiTi virtual instruments under identical conditions.
Main Results:
- FEA simulations demonstrated significant agreement with in vitro torsional test results, confirming model accuracy.
- M-Wire instruments exhibited greater flexibility at lower deflection levels compared to conventional NiTi instruments.
- Torsional fracture resistance was slightly higher for M-Wire instruments, but the overall improvement in torsional performance at fracture was limited.
Conclusions:
- FEA is a reliable method for simulating the torsional performance of WaveOne endodontic instruments.
- M-Wire NiTi alloy enhances the flexibility of WaveOne instruments, particularly at low deflections.
- While M-Wire offers benefits, its superior fracture resistance does not translate into substantial improvements in overall torsional performance at the point of fracture.
