Mai Hai Yen, Mai Hang-Nga, Lee Cheong-Hee, Lee Kyu-Bok, Kim So-Yeun, Lee Jae-Mok, Lee Keun-Woo, Lee Du-Hyeong
Department of Prosthodontics, School of Dentistry, Kyungpook National University, Daegu, Republic of Korea.
Institute for Translational Research in Dentistry, Kyungpook National University, Daegu, Republic of Korea.
J Adv Prosthodont. 2022 Apr;14(2):88-95. doi: 10.4047/jap.2022.14.2.88. Epub 2022 Apr 27.
This study investigated the accuracy of full-arch intraoral scans obtained by various scan strategies with the segmental scan and merge methods.
Seventy intraoral scans (seven scans per group) were performed using 10 scan strategies that differed in the segmental scan (1, 2, or 3 segments) and the scanning motion (straight, zigzag, or combined). The three-dimensional (3D) geometric accuracy of scan images was evaluated by comparison with a reference image in an image analysis software program, in terms of the arch shape discrepancies. Measurement parameters were the intermolar distance, interpremolar distance, anteroposterior distance, and global surface deviation. One-way analysis of variance and Tukey honestly significance difference post hoc tests were carried out to compare differences among the scan strategy groups (α = .05).
The linear discrepancy values of intraoral scans were not different among scan strategies performed with the single scan and segmental scan methods. In general, differences in the scan motion did not show different accuracies, except for the intermolar distance measured under the scan conditions of a 3-segmental scan and zigzag motion. The global surface deviations were not different among all scan strategies.
The segmental scan and merge methods using two scan parts appear to be reliable as an alternative to the single scan method for full-arch intraoral scans. When three segmental scans are involved, the accuracy of complete arch scan can be negatively affected.
本研究调查了通过各种扫描策略结合分段扫描和合并方法获得的全牙弓口内扫描的准确性。
使用10种扫描策略进行了70次口内扫描（每组7次扫描），这些策略在分段扫描（1、2或3段）和扫描运动（直线、之字形或组合）方面有所不同。在图像分析软件程序中，通过与参考图像比较，根据牙弓形状差异评估扫描图像的三维（3D）几何准确性。测量参数为磨牙间距离、前磨牙间距离、前后距离和整体表面偏差。进行单因素方差分析和Tukey真实显著性差异事后检验，以比较扫描策略组之间的差异（α = 0.05）。
单扫描和分段扫描方法执行的扫描策略之间，口内扫描的线性差异值没有差异。一般来说，扫描运动的差异除了在3段分段扫描和之字形运动的扫描条件下测量的磨牙间距离外，没有显示出不同的准确性。所有扫描策略之间的整体表面偏差没有差异。
使用两个扫描部分的分段扫描和合并方法似乎是全牙弓口内扫描单扫描方法的可靠替代方法。当涉及三段分段扫描时，完整牙弓扫描的准确性可能会受到负面影响。
