Endo Mizuki, Terajima Masahiko, Goto Tazuko K, Tokumori Kenji, Takahashi Ichiro
Section of Orthodontics and Dentofacial Orthopedics, Faculty of Dental Science, Kyushu University, 3-1-1 Maidashi, Fukuoka, Japan.
Orthodontics (Chic.). 2011 Fall;12(3):210-21.
To assess the three-dimensional (3D) position of the temporomandibular joint (TMJ) in the cranial base structure, the 3D morphology of the TMJ, and the fossa-condyle interspaces in subjects with normal occlusion and patients with mandibular asymmetries using 3D computed tomography (CT) images. We hypothesized that the fossa-condyle interspaces and the shape or size of the TMJ would correlate with mandibular asymmetry.
Twenty women with mandibular asymmetry and nine control subjects were recruited. The TMJ position, linear distances, angles, surface areas, and the fossa-condyle relationship were assessed with 3D CT images of the TMJ.
The fossa surface area was larger on the contralateral side, although no significant difference was observed in the linear or angular measurements of the fossa. The condylar neck height and condylar angle on the contralateral side were larger than those on the deviated side, and the frontal neck angle on the deviated side was larger than that on the contralateral side and of the control. No significant difference was observed in the condylar area. The fossa-condyle interspaces in the posterolateral section of the TMJ were smaller on the deviated side.
The condyle in the patients with mandibular asymmetry was rotated posterolaterally within the fossa on the deviated side. Patients with mandibular asymmetry showed larger fossas and longer condylar processes on the contralateral side and narrower fossa-condyle interspaces on the deviated side, especially in the posterolateral section of the TMJ.
使用三维计算机断层扫描（CT）图像评估正常咬合受试者和下颌不对称患者颞下颌关节（TMJ）在颅底结构中的三维位置、TMJ的三维形态以及窝-髁间隙。我们假设窝-髁间隙以及TMJ的形状或大小与下颌不对称相关。
招募了20名下颌不对称女性和9名对照受试者。通过TMJ的三维CT图像评估TMJ位置、线性距离、角度、表面积以及窝-髁关系。
对侧窝的表面积更大，尽管在窝的线性或角度测量中未观察到显著差异。对侧髁颈高度和髁角大于偏斜侧，偏斜侧的额颈角大于对侧和对照组。髁面积未观察到显著差异。TMJ后外侧部分的窝-髁间隙在偏斜侧较小。
下颌不对称患者的髁在偏斜侧的窝内向后外侧旋转。下颌不对称患者对侧的窝更大，髁突更长，偏斜侧的窝-髁间隙更窄，尤其是在TMJ的后外侧部分。
