Dental Implant Centre, Faculty of Dentistry, Mahidol University, Salaya, Thailand.
PLoS One. 2023 Sep 21;18(9):e0291831. doi: 10.1371/journal.pone.0291831. eCollection 2023.
In implant dentistry, the advent of intraoral scanning technology has revolutionized traditional clinical processes by streamlining procedures and ensuring predictable treatment outcomes. However, achieving accurate virtual implant positions using intraoral scanners and scan bodies can be influenced by various clinical and laboratory factors. This study aims to investigate the impact of scan body image capture deficiency and scan body alignment methods in computer-aided design (CAD) software on the accuracy of virtual implant positions, particularly in different implant depths. Three stereolithographic half-arch implant models with different implant depths were prepared, representing three scenarios of scan body exposure: full exposed scan body, 2/3 exposed scan body, and 1/3 exposed scan body. The scan body image capture deficiency and alignment methods were simulated using CAD software. The deviation of virtual implant positions obtained from different scenarios were evaluated using 3D analysis software. The highest angular and linear deviation (0.237±0.059 degrees, 0.084±0.068 mm) were found in the 1/4 upper and lower part scan body deficiency using the 1-point alignment method in the 1/3 exposed scan body. Two-way ANOVA analysis revealed significant effects of scan deficiency on virtual implant position deviations across all scan body exposures, except for the linear deviation when the scan body was exposed 2/3 of its length. Furthermore, scan deficiencies in the 1/4 upper and lower parts of the scan body significantly affected implant angular deviation regardless of scan body exposure, while implant linear deviation was specifically affected when the scan body was exposed to only 1/3 of its total length. Deficiencies in scan body acquisition, particularly in deep soft tissue situations, can lead to deviations in both angular and linear positioning of virtual implants. Employing appropriate scan body alignment methods such as a 3-point alignment approach demonstrates better accuracy compared to a 1-point alignment.
在种植牙科领域，口腔内扫描技术的出现彻底改变了传统的临床流程，使治疗过程更加简化，并确保了可预测的治疗效果。然而，使用口腔内扫描仪和扫描体获得准确的虚拟种植体位置可能会受到各种临床和实验室因素的影响。本研究旨在探讨扫描体图像采集不足和扫描体在 CAD 软件中的对齐方法对虚拟种植体位置准确性的影响，特别是在不同种植深度的情况下。本研究制备了三个具有不同种植深度的立体光刻半口种植体模型，代表了三种扫描体暴露情况：完全暴露的扫描体、2/3 暴露的扫描体和 1/3 暴露的扫描体。使用 CAD 软件模拟了扫描体图像采集不足和对齐方法。使用 3D 分析软件评估了从不同情况下获得的虚拟种植体位置的偏差。在 1/3 暴露的扫描体中，使用 1 点对齐方法时，1/4 上、下扫描体采集不足的情况下，虚拟种植体位置的偏差最大（0.237±0.059 度，0.084±0.068 毫米）。双向方差分析显示，除了扫描体暴露 2/3 长度时的线性偏差外，扫描体采集不足对所有扫描体暴露的虚拟种植体位置偏差均有显著影响。此外，扫描体上、下 1/4 部分的采集不足会显著影响种植体的角度偏差，而当扫描体仅暴露其总长度的 1/3 时，种植体的线性偏差会受到特别影响。扫描体采集不足，尤其是在深部软组织情况下，会导致虚拟种植体的角度和线性定位偏差。与 1 点对齐相比，采用 3 点对齐等适当的扫描体对齐方法可以提高准确性。
