Ahn Sug-Joon, Kim Tae-Woo, Nahm Dong-Seok
Department of Orthodontics, College of Dentistry, Seoul National University, South Korea.
Am J Orthod Dentofacial Orthop. 2004 Oct;126(4):486-94; discussion 494-5. doi: 10.1016/j.ajodo.2003.08.029.
The aim of this study was to find cephalometric keys to provide information on the progression of temporomandibular internal derangement. The sample consisted of 58 women with Class II malocclusions. They were examined with routine lateral cephalograms and magnetic resonance imaging of the temporomandibular joint (TMJ) before orthodontic treatment. They were classified into 3 groups according to the results of the magnetic resonance imaging: normal disk position, disk displacement with reduction, and disk displacement without reduction. Thirty-four cephalometric variables regarding their pretreatment lateral cephalograms were analyzed by 1-way analysis of variance to evaluate the differences in the dentofacial morphology among the 3 groups. The results showed a decrease in posterior facial height, a decrease in ramus height, and backward rotation and retruded position of the mandible in the subjects with internal derangement of the TMJ. These changes were less severe in those with disk displacement with reduction and more severe as internal derangement progressed to disk displacement without reduction. The results suggest that internal derangement of the TMJ might induce dentofacial changes, and that some cephalometric variables can assist in identifying potential patients with internal derangement of the TMJ.
本研究的目的是寻找头影测量关键指标，以提供有关颞下颌关节内紊乱进展的信息。样本包括58名安氏II类错牙合畸形女性。在正畸治疗前，她们接受了常规头颅侧位片和颞下颌关节（TMJ）的磁共振成像检查。根据磁共振成像结果，她们被分为3组：正常盘位置、可复性盘移位和不可复性盘移位。通过单因素方差分析对34个关于其治疗前头颅侧位片的头影测量变量进行分析，以评估3组之间牙颌面形态的差异。结果显示，颞下颌关节内紊乱患者的面后部高度降低、升支高度降低，下颌向后旋转且位置后缩。这些变化在可复性盘移位患者中较轻，而随着内紊乱进展至不可复性盘移位则更为严重。结果表明，颞下颌关节内紊乱可能会引起牙颌面变化，并且一些头影测量变量有助于识别颞下颌关节内紊乱的潜在患者。
