Quantitative measurements of the morphological parameters of the Temporomandibular Joint (TMJ) will provide a better understanding of the structure and function of the TMJ in the field of orthodontics for patients with malocclusion (1). A 3D model reconstructed from 2D CBCT scans can be reproduced with a size and volume that are identical to the actual anatomical values, and can provide measurements that are more accurate than simple linear measurements obtained from 2D CBCT scans alone (2). Although there have been efforts to standardize 3D measurements of the TMJ, the differences between 2D CBCT and 3D measurements remain unclear (1). In this study, subjects were divided into groups with malocclusion of Classes I, II, and III according to the ANB angle and molar occlusal relationships as evaluated by an orthodontist. CBCT scans were obtained in the Digital Imaging and Communications in Medicine (DICOM) format. The 2D CBCT images were measured in accordance with the method by previous research (Fig. 1), (3). For the 3D model measurements, the DICOM files were imported into Mimics software (Materialise, Leuven, Belgium), and the skull was reconstructed into a 3D model to measure the coronal condylar width (CCW), coronal condylar angle (CCA), horizontal condylar angle (HCA), and sagittal ramus angle (SRA) (Fig. 2).

中文翻译：

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使用 2D 和 3D 测量方法对咬合不正患者颞下颌关节的形态学分析

颞下颌关节 (TMJ) 形态参数的定量测量将有助于更好地了解 TMJ 在正畸领域的结构和功能，以帮助错牙合患者 (1)。从 2D CBCT 扫描重建的 3D 模型可以以与实际解剖值相同的大小和体积再现，并且可以提供比仅从 2D CBCT 扫描获得的简单线性测量值更准确的测量值 (2)。尽管已经努力使 TMJ 的 3D 测量标准化，但 2D CBCT 和 3D 测量之间的差异仍不清楚 (1)。在这项研究中，根据正畸医生评估的 ANB 角度和磨牙咬合关系，将受试者分为 I ​​类、II 类和 III 类咬合不正的组。CBCT 扫描以医学数字成像和通信 (DICOM) 格式获得。2D CBCT图像是按照以前研究的方法（图1），（3）测量的。对于 3D 模型测量，将 DICOM 文件导入 Mimics 软件（Materialise，Leuven，Belgium），将颅骨重建为 3D 模型以测量冠状髁宽（CCW）、冠状髁角（CCA）、水平髁角（HCA）和矢状支角（SRA）（图2）。