Department of Orthodontics, School of Dentistry, Yonsei University, Seoul, South Korea.
Am J Orthod Dentofacial Orthop. 2013 Sep;144(3):330-40. doi: 10.1016/j.ajodo.2013.03.024.
This study was conducted to measure the dimensional changes in the cranial base and the mandible in patients with facial asymmetry and mandibular prognathism, and to examine the morphologic relationship between asymmetries of the cranial base and the mandible.
The patients were 60 adults with mandibular prognathism, divided into a symmetry group (menton deviation, <2 mm; n = 30) and an asymmetry group (menton deviation, >4 mm; n = 30) according to the degree of menton deviation. Three-dimensional computed tomography scans were obtained with a spiral scanner. Landmarks were designated on the reconstructed 3-dimensional surface models. Linear, angular, and volumetric measurements of the cranial base and mandibular variables were made.
In the asymmetry group, the hemi-base, anterior cranial base, and middle cranial base volumes were significantly larger (P <0.01), and crista galli to sphenoid, sphenoid to petrous ridge, anterior clinoid process to petrous ridge, and vomer to petrous ridge lengths were significantly longer (P <0.05) on the nondeviated side than on the deviated side. Menton deviation was significantly correlated with the difference in hemi-base volume, and ramal volume was significantly correlated with the difference in hemi-base and middle cranial base volumes between the nondeviated and deviated sides (P <0.05).
In patients with facial asymmetry and mandibular prognathism, cranial base volume increased on the nondeviated side and was also correlated with mandibular asymmetry.
本研究旨在测量颜面不对称和下颌前突患者颅底和下颌的尺寸变化，并探讨颅底和下颌不对称的形态关系。
患者为 60 名下颌前突成年人，根据颏部偏斜程度分为对称组（颏部偏斜<2mm；n=30）和不对称组（颏部偏斜>4mm；n=30）。使用螺旋扫描器获得三维 CT 扫描。在重建的三维表面模型上标记标志。对颅底和下颌变量进行线性、角度和体积测量。
在不对称组中，非偏斜侧的半基、前颅底和中颅底体积明显增大（P<0.01），岩骨至蝶骨、蝶骨至岩嵴、前床突至岩嵴和犁骨至岩嵴长度明显延长（P<0.05）。颏部偏斜与半基体积差异显著相关，下颌支体积与非偏斜侧和偏斜侧半基和中颅底体积差异显著相关（P<0.05）。
在颜面不对称和下颌前突患者中，非偏斜侧颅底体积增加，且与下颌不对称相关。
