Kihara Takuya, Keller Andreas, Ogawa Takumi, Armand Mehran, Martin-Gomez Alejandro
Biomechanical- and Image-Guided Surgical Systems (BIGSS), Laboratory for Computational Sensing and Robotics, Johns Hopkins University, Hackerman Hall, 3400N, Charles Street, Baltimore, MD 21218, USA; Department of Fixed Prosthodontics, School of Dental Medicine, Tsurumi University, 2-1-3 Tsurumi, Tsurumi-ku, Yokohama, Kanagawa, 734-8501, Japan.
Biomechanical- and Image-Guided Surgical Systems (BIGSS), Laboratory for Computational Sensing and Robotics, Johns Hopkins University, Hackerman Hall, 3400N, Charles Street, Baltimore, MD 21218, USA; Department of Computer Science, Technical University of Munich, Munich, Germany.
J Dent. 2024 Sep;148:105217. doi: 10.1016/j.jdent.2024.105217. Epub 2024 Jun 28.
Tooth preparation is complicated because it requires the preparation of an abutment while simultaneously predicting the ideal shape of the tooth. This study aimed to develop and evaluate a system using augmented reality (AR) head-mounted displays (HMDs) that provide dynamic navigation capabilities for tooth preparation.
The proposed system utilizes optical see-through HMDs to overlay digital information onto the real world and enrich the user's environment. By integrating tracking algorithms and three-dimensional modeling, the system provides real-time visualization and navigation capabilities during tooth preparation by using two different visualization techniques. The experimental setup involved a comprehensive analysis of the distance to the surface and cross-sectional angles between the ideal and prepared teeth using three scenarios: traditional (without AR), overlay (AR-assisted visualization of the ideal prepared tooth), and cross-sectional (AR-assisted visualization with cross-sectional views and angular displays).
A user study (N = 24) revealed that the cross-sectional approach was more effective for angle adjustment and reduced the occurrence of over-reduction. Additional questionnaires revealed that the AR-assisted approaches were perceived as less difficult, with the cross-sectional approach excelling in terms of performance.
Visualization and navigation using cross-sectional approaches have the potential to support safer tooth preparation with less overreduction than traditional and overlay approaches do. The angular displays provided by the cross-sectional approach are considered helpful for tooth preparation.
The AR navigation system can assist dentists during tooth preparation and has the potential to enhance the accuracy and safety of prosthodontic treatment.
牙体预备很复杂，因为它需要预备基牙，同时还要预测牙齿的理想形态。本研究旨在开发并评估一种使用增强现实（AR）头戴式显示器（HMD）的系统，该系统可为牙体预备提供动态导航功能。
所提出的系统利用光学透视HMD将数字信息叠加到现实世界中，丰富用户的环境。通过集成跟踪算法和三维建模，该系统在牙体预备过程中使用两种不同的可视化技术提供实时可视化和导航功能。实验设置包括使用三种场景对理想牙齿与预备牙齿之间的表面距离和横截面角度进行全面分析：传统（无AR）、叠加（理想预备牙齿的AR辅助可视化）和横截面（带有横截面视图和角度显示的AR辅助可视化）。
一项用户研究（N = 24）表明横截面方法在角度调整方面更有效，且减少了过度预备的发生。另外的问卷调查显示，AR辅助方法被认为难度较小，其中横截面方法在性能方面表现出色。
与传统方法和叠加方法相比，使用横截面方法进行可视化和导航有可能支持更安全的牙体预备，减少过度预备。横截面方法提供的角度显示被认为对牙体预备有帮助。
AR导航系统可在牙体预备过程中协助牙医，有可能提高口腔修复治疗的准确性和安全性。
