Effect of 125-150 Hz Vibrational Frequency Electric Toothbrush on Teeth and Supporting Structures: A Finite Element...

Area of Science:

• Biomedical Engineering
• Dental Mechanics
• Computational Biology

Background:

• Electric toothbrushes utilize varying vibrational frequencies for enhanced plaque removal.
• Understanding the biomechanical effects of these vibrations on dental structures is crucial for product safety.
• Previous research has not comprehensively assessed the safety of 125-150 Hz frequencies on the entire craniofacial complex.

Purpose of the Study:

• To evaluate the safety of 125-150 Hz vibrational frequency electric toothbrushes on teeth and associated oral structures.
• To quantify stress and displacement within the maxilla, mandible, and dentition under simulated brushing forces.

Main Methods:

• A 3D finite element method (FEM) model of a human skull, including maxilla, mandible, and teeth, was developed from CT scans.
• Linear static analysis was performed by applying a 15g force to the anterior regions of the maxilla and mandible.
• Calculations included primary displacement (sagittal, vertical, transversal) and principal stress levels.

Main Results:

• Applying 15g force to maxillary anterior teeth resulted in minimal deflection (0.003-0.017 mm) and stress (0.004-0.017 MPa).
• Applying 15g force to mandibular anterior teeth showed slightly higher deflection (0.077-0.078 mm) and stress (0.051 MPa).
• Overall stress and displacement levels were found to be negligible across all simulated conditions.

Conclusions:

• The finite element method analysis indicated that 125-150 Hz vibrational frequencies generate negligible stress on the maxilla, mandible, and dentition.
• The applied forces and boundary conditions did not result in harmful effects on the teeth and supporting structures.
• A vibrational frequency of 125-150 Hz is considered optimal and safe for electric toothbrush applications.