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Oscillation characteristics of endodontic files: numerical model and its validation
Bram Verhaagen1, Simon C Lea, Gerrit J de Bruin
1Institute for Biomedical Technology and Technical Medicine MIRA, University of Twente, Enschede, The Netherlands. b.verhaagen@tnw.utwente.nl
Ultrasonic files significantly improve root canal cleaning during endodontic treatment. Numerical and laser measurements confirm file oscillation patterns, aiding in predicting performance and fracture risk.
Area of Science:
- Endodontics
- Biomedical Engineering
- Acoustics
Background:
- Root canal treatment aims to eliminate bacteria using antimicrobial fluids.
- Conventional syringe irrigation has limitations in cleaning efficacy.
- Passive ultrasonic irrigation (PUI) enhances fluid agitation for better cleaning.
Purpose of the Study:
- To numerically analyze the oscillation characteristics of endodontic files during PUI.
- To compare numerical simulations with experimental measurements of file oscillations.
- To explore the potential of numerical modeling for predicting file behavior and acoustic streaming.
Main Methods:
- Modeling the endodontic file as a tapered, driven rod.
- Performing numerical analysis of the file's oscillation patterns.
- Measuring file oscillations using a scanning laser vibrometer.
Main Results:
- Numerical analysis revealed a sinusoidal wave pattern in file oscillation, with increasing amplitude and decreasing wavelength towards the file tip.
- Experimental measurements using a scanning laser vibrometer showed good agreement with the numerical simulations.
- The study demonstrated the effectiveness of numerical modeling in predicting endodontic file behavior.
Conclusions:
- Numerical modeling provides accurate predictions of endodontic file oscillation patterns during PUI.
- This model can help predict fracture likelihood and understand acoustic streaming effects.
- The findings support the optimization of file design and PUI protocols for improved root canal cleaning.
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