Chang Wei-Ting, Lyu Dong-Yuan, Lai Yu-Lin, Yen Jui-Ying, Chen Ya-Chi, Lee Shyh-Yuan
School of Dentistry, National Yang Ming Chiao Tung University, Taipei, Taiwan.
Department of Stomatology, Taipei Veterans General Hospital, Taipei, Taiwan.
J Dent Sci. 2025 Jan;20(1):147-153. doi: 10.1016/j.jds.2024.09.005. Epub 2024 Sep 27.
BACKGROUND/PURPOSE: Identifying crestal bone level (CBL) on the buccal and lingual aspects poses challenges in conventional dental radiographs. Given that optical coherence tomography (OCT) has the capability to non-invasively provide in-depth information about the periodontium, this in vitro study aimed to assess whether OCT can effectively identify periodontal landmarks and measure CBL in the presence of gingiva.
An in-house handheld scanning probe connected to a 1310-nm swept-source OCT (SS-OCT) system, along with self-developed algorithms were employed to measure the CBL in dental models with artificial gingiva. Markers were positioned 0.5 mm above the artificial gingival margin (SG) and the crestal bone (SC) on both the mid-buccal and mid-lingual sides of 28 plastic teeth. The distances between the paired SG and SC were measured in the OCT images after correcting for the optical path through the covering artificial gingiva. These measurements were subsequently compared to the ground truth values obtained using a 2.5D inspection system.
The mean difference in CBL measured by SS-OCT and 2.5D was 0.008 mm (95 % CI: -0.092 to 0.108 mm). Statistical analysis using a three-way ANOVA indicated that the measurement differences were not significant across maxillary/mandible, anterior/posterior, and buccal/lingual dimensions. Furthermore, these differences were not associated with gingival thickness (α = 0.05).
The proposed SS-OCT system demonstrated its capability to accurately and non-invasively assess CBL through artificial gingiva. Moreover, it facilitated the semi-automatic delineation of critical periodontal landmarks on OCT en face images, highlighting its potential for clinical applications.
背景/目的：在传统牙科X光片中，确定颊侧和舌侧的牙槽嵴骨水平（CBL）具有挑战性。鉴于光学相干断层扫描（OCT）能够无创地提供有关牙周组织的深度信息，本体外研究旨在评估OCT在有牙龈存在的情况下能否有效识别牙周标志并测量CBL。
使用连接到1310纳米扫频源OCT（SS-OCT）系统的内部手持式扫描探头以及自行开发的算法，测量带有人工牙龈的牙科模型中的CBL。在28颗塑料牙的颊侧和舌侧中点，将标记物放置在人工牙龈边缘（SG）和牙槽嵴骨（SC）上方0.5毫米处。在校正通过覆盖的人工牙龈的光路后，在OCT图像中测量配对的SG和SC之间的距离。随后将这些测量结果与使用2.5D检测系统获得的真实值进行比较。
SS-OCT和2.5D测量的CBL平均差异为0.008毫米（95%CI：-0.092至0.108毫米）。使用三因素方差分析的统计分析表明，在上颌/下颌、前/后以及颊侧/舌侧维度上，测量差异不显著。此外，这些差异与牙龈厚度无关（α=0.05）。
所提出的SS-OCT系统展示了其通过人工牙龈准确且无创地评估CBL的能力。此外，它有助于在OCT正面图像上半自动描绘关键的牙周标志，突出了其在临床应用中的潜力。
