Department of Orthodontics, Korea University Guro Hospital, Seoul, 08308, Republic of Korea.
Department of Orthodontics, Graduate School of Clinical Dentistry, Korea University, Seoul, 02841, Republic of Korea.
Sci Rep. 2021 Apr 30;11(1):9389. doi: 10.1038/s41598-021-88940-y.
The aim of this study was to assess the changes in individual condyles from 5 to 8 years in patients with temporomandibular joint (TMJ) osteoarthritis using 3-dimensional cone beam computed tomography (3D CBCT) reconstruction and superimposition. To assess the longitudinal TMJ changes, CBCT was performed at initial (T) and final (T) timepoints that were at least 5 years apart and at a middle (T) timepoint. To improve the accuracy, we used a novel superimposition method that designated areas of coronoid process and mandibular body. The differences in the resorption and apposition amounts were calculated between each model via maximum surface distances. The greatest resorption and apposition observed were - 7.48 and 2.66 mm, respectively. Evaluation of the changes in each condyle showed that osteoarthritis leads to both resorption and apposition. Resorption was mainly observed in the superior region, while high apposition rates were observed (in decreasing order) in the posterior, lateral, and anterior regions. The medial parts showed greater apposition than the lateral parts in all regions. Our superimposition method reveals that both resorption and apposition were observed in condyles with TMJ osteoarthritis, and resorption/apposition patterns depend on the individual condyle and its sites.
本研究旨在使用三维锥形束 CT（3D CBCT）重建和叠加技术，评估 5 至 8 年间颞下颌关节（TMJ）骨关节炎患者个体髁突的变化。为了评估 TMJ 的纵向变化，在至少相隔 5 年的初始（T）和最终（T）时间点以及中间（T）时间点进行 CBCT 检查。为了提高准确性，我们使用了一种新的叠加方法，该方法指定了冠状突和下颌体的区域。通过最大表面距离计算每个模型之间吸收和堆积量的差异。观察到的最大吸收和堆积分别为-7.48 和 2.66mm。对每个髁突变化的评估表明，骨关节炎会导致吸收和堆积。吸收主要发生在上部区域，而后部、外侧和前部区域的堆积率较高（依次递减）。在所有区域中，内侧部分的堆积量均大于外侧部分。我们的叠加方法表明，TMJ 骨关节炎患者的髁突中均观察到吸收和堆积，吸收/堆积模式取决于个体髁突及其部位。
