Evaluating the feasibility of using augmented reality for tooth preparation

Area of Science:

• Dental Technology
• Augmented Reality
• Surgical Navigation

Background:

• Tooth preparation is a complex dental procedure requiring precise abutment shaping and ideal tooth form prediction.
• Current methods can lead to inaccuracies and over-reduction, impacting prosthodontic treatment outcomes.

Purpose of the Study:

• To develop and evaluate an augmented reality (AR) system using head-mounted displays (HMDs) for dynamic navigation in tooth preparation.
• To assess the efficacy of AR-assisted visualization techniques compared to traditional methods.

Main Methods:

• An AR system utilizing optical see-through HMDs was developed, integrating tracking algorithms and 3D modeling for real-time visualization.
• Three scenarios were tested: traditional (no AR), overlay AR, and cross-sectional AR with angular displays.
• A user study (N=24) evaluated accuracy in distance to surface and cross-sectional angles.

Main Results:

• The cross-sectional AR approach significantly improved angle adjustment and reduced tooth over-reduction compared to traditional and overlay methods.
• User feedback indicated AR-assisted approaches were less difficult, with the cross-sectional method showing superior performance.
• Quantitative analysis confirmed reduced errors in distance and angle measurements with the cross-sectional AR technique.

Conclusions:

• AR-assisted visualization, particularly with cross-sectional views and angular displays, enhances the safety and precision of tooth preparation.
• The developed AR navigation system shows potential for improving accuracy and reducing over-reduction in clinical prosthodontic treatments.
• This technology offers a promising tool to support dentists in achieving optimal tooth preparation outcomes.