Development of a multi-layered virtual tooth model for the haptic dental training system

Area of Science:

• Biomedical Engineering
• Dental Education Technology
• Virtual Reality Applications

Background:

• Dental education requires realistic simulation for skill development.
• Current virtual reality (VR) systems lack accurate multi-layered tooth models with varying mechanical properties.
• Developing a haptic virtual tooth model is crucial for effective VR dental training.

Purpose of the Study:

• To construct a multi-layered virtual tooth model for a VR haptic dental training system.
• To simulate the mechanical feedback of cutting real teeth within a virtual environment.
• To evaluate the model's fidelity in replicating the tactile sensations of dental procedures.

Main Methods:

• A virtual tooth model was developed with distinct layers mimicking real tooth structures.
• Cutting experiments on real teeth were conducted to determine mechanical properties (spring and damping coefficients).
• The virtual model's haptic feedback was calibrated using determined coefficients to simulate realistic cutting forces.

Main Results:

• A multi-layered virtual tooth model was successfully constructed and integrated into the VR system.
• The model accurately simulated the sensation of cutting, comparable to real teeth.
• Feedback force variations were observed at layer boundaries, reflecting differing mechanical hardnesses.
• Determined coefficients for dental hard tissue: spring coefficient 0.8 N/mm, damping coefficient 1.79 Nsec/mm.

Conclusions:

• The developed multi-layered virtual tooth model provides realistic haptic feedback for dental training.
• This VR system offers a promising platform for acquiring essential dental hand skills.
• The fidelity of the virtual model supports its potential in future dental education curricula.