Provincial Key Lab for Biomechanical Engineering, Sichuan University, Chengdu 610065, China.
J Healthc Eng. 2017;2017:5680708. doi: 10.1155/2017/5680708. Epub 2017 May 2.
The differences of temporomandibular joint (TMJ) morphologic parameters by using two-dimensional (2D) and three-dimensional (3D) measuring methods were compared. Ten asymptomatic subjects (26.75 ± 4.89 years) were randomly recruited. The 3D models of the maxilla, mandible, and teeth were reconstructed according to cone-beam computed tomography (CBCT) image data. The morphologic parameters of TMJs were measured by the 2D CBCT measuring method (group A) and the 3D reconstruction model measuring method (group B), respectively. The morphologic parameters in each group were assessed by paired samples -test, and the statistical significance was achieved when < 0.05. The horizontal condylar angle (HCA), sagittal ramus angle (SRA), medial joint space (MJS), lateral joint space (LJS), superior joint space (SJS), and anterior joint space (AJS) in group A were significantly smaller than those in group B ( < 0.05). The HCA on the left side was significantly smaller than that on the right side in group A ( < 0.05). However, all the morphologic parameters in group B were not significantly different between left and right sides. In conclusion, there were significant differences for the morphologic parameters of TMJ measured on 2D CBCT and 3D models. 3D measuring method should be used for the detection of TMJ morphology in clinical practice.
比较了使用二维（2D）和三维（3D）测量方法测量颞下颌关节（TMJ）形态参数的差异。随机招募了 10 名无症状受试者（26.75±4.89 岁）。根据锥形束 CT（CBCT）图像数据重建上颌、下颌和牙齿的 3D 模型。使用 2D CBCT 测量方法（A 组）和 3D 重建模型测量方法（B 组）分别测量 TMJ 的形态参数。通过配对样本 t 检验评估每组中的形态参数，当 <0.05 时具有统计学意义。A 组的水平髁突角（HCA）、矢状支突角（SRA）、内侧关节间隙（MJS）、外侧关节间隙（LJS）、上关节间隙（SJS）和前关节间隙（AJS）明显小于 B 组（<0.05）。A 组左侧的 HCA 明显小于右侧（<0.05）。然而，B 组中所有形态参数在左右两侧之间均无显著差异。总之，2D CBCT 和 3D 模型测量的 TMJ 形态参数存在显著差异。在临床实践中，应使用 3D 测量方法检测 TMJ 形态。
