Assessment of Virtual Handles for Dental Implant Manipulation in VR Planning

Overview

This study evaluated the usability of virtual handles in a VR dental implant planning system by comparing implant manipulation with and without handles. The handles allowed more precise control of implant position and orientation but required more time to complete tasks. The findings highlight the trade-off between accuracy and efficiency in VR implant planning.

Background

Dental implant surgery replaces missing teeth with implants and prostheses, requiring precise 3D planning to avoid anatomical complications. Current implant planning systems typically use 2D displays and mouse input, limiting intuitive manipulation of 3D objects. Virtual reality (VR) offers immersive 3D interaction using hand controllers, potentially improving implant placement accuracy. However, direct manipulation in VR can be imprecise due to hand instability, prompting the development of virtual handles to restrict movements along specific axes for fine-tuning implant positioning.

Data Highlights

Key Findings

• Direct interaction with implants in VR allows manipulation in all 6 degrees of freedom but can cause unintended simultaneous movements, reducing precision.
• Virtual handles enable axis-restricted translation and rotation, improving fine-tuning accuracy of implant placement.
• Using handles increases task completion time due to the need for multiple sequential operations.
• Handheld VR controllers provide stable and accurate input essential for dental implant manipulation but may cause arm fatigue.
• Virtual handles balance the trade-off between interaction intuitiveness and manipulation precision in VR implant planning.

Clinical Implications

Incorporating virtual handles in VR dental implant planning systems can enhance the precision of implant positioning by restricting movements to specific axes, which is critical for avoiding anatomical complications. Clinicians should consider the increased time requirement for fine-tuning with handles but may benefit from improved accuracy and reduced risk of malposition. VR planning tools with such features may improve surgical outcomes by facilitating more controlled implant placement.

Conclusion

Virtual handles in VR implant planning improve the accuracy of implant manipulation by enabling controlled, axis-specific adjustments, albeit with increased time expenditure. This approach offers a promising enhancement to current VR dental implant planning workflows, balancing precision and usability.

References

1. Zorzal et al. 2019 -- VR Implant Planning System for Student Learning
2. Mendes et al. 2020 -- Virtual Handles for Axis-Restricted Manipulation
3. Moussa et al. 2021 -- Review of VR in Dental Education
4. Huang et al. 2018 -- Efficiency of VR Controllers in Task Performance
5. Frees et al. 2017 -- Accuracy Limitations in Direct VR Interaction