Introduction: 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. Methods: The patients were 60 adults with mandibular prognathism, divided into a symmetry group (menton deviation,<2 mm; n 5 30) and an asymmetry group (menton deviation, >4 mm; n 5 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. Results: 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). Conclusions: In patients with facial asymmetry and mandibular prognathism, cranial base volume increased on the nondeviated side and was also correlated with mandibular asymmetry.
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机译：简介：本研究旨在测量面部不对称和下颌前突的患者颅底和下颌骨的尺寸变化，并检查颅底和下颌骨的不对称性之间的形态关系。方法：将60名成人下颌前突的患者根据芒通的程度分为对称组（智齿偏差<2 mm; n 5 30）和不对称组（智齿偏差> 4 mm; n 5 30）。偏差。用螺旋扫描仪进行三维计算机断层扫描。在重建的3维表面模型上指定了地标。进行了颅底和下颌变量的线性，角度和体积测量。结果：在不对称组中，半基础，前颅底和中颅底的体积显着较大（P <0.01），cr鸡至蝶骨，蝶骨至岩rou，前斜突至岩rou和犁骨无偏移侧的小脊长明显大于偏侧（P <0.05）。在无偏侧和偏侧之间，Menton偏差与半碱基量的差异显着相关，而ramal体积与半碱基量和中颅底量的差异显着相关（P <0.05）。结论：面部不对称和下颌前突的患者，颅底体积在非偏移侧增加，并且与下颌不对称相关。
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