Objective:To investigate the difference of cervical vertebrae alignment and dentofacial morphology between patients with mandibular deviation and persons with mormal occlusion .Methods:lateral cephalometric radiographs were taken in 20 patients with mandibular deviation and 41 young adults with normal occlusion.Morphometry was conducted using a software.Results： (1) The inclination of occlusion plane , mandibular plane and the curve of cervical vertebrae were all higher in mandibular deviation patients than those in normal occlusion persons. But the cervical vertebrae inclination was smaller in the patients. (2) The inclination of the dens and the cervical vertebrae plane showed positive correlation to Frankfort horizontal,palatal,occlusion and mandible plane. Each plane inclination was high in the cases with forward flexion dens in patient group;(3)The curve from the second cervical vertebrae to the fourth cervical vertebrae had a negative correlation to the dens and the cervical vertebrae plane inclination .The curve was small in the patients with forward flexion dens but large in those with backward flexion dens.Conclusion:Dentofacial morphology was correlated to cervical vertebrae alignment; furthermore,dentofacial morphology and cervical vertebrae posture in the patients with mandibular deviation are significantly different from those in the individuals with normal occlusion.%目的：探讨下颌偏斜者的颌面形态、颈椎姿势与正常牙 合者的差异；研究颌面形态与颈椎姿势的相关性。方法：对20例恒牙列下颌偏斜患者及41例正常咬合者拍摄自然头位时的头颅定位侧位片。结果：①下颌偏斜者咬合平面、下颌平面的陡度及颈椎弯曲度大于正常咬合者而颈椎倾斜度小于对照组，患者头呈前倾位；②下颌偏斜者的齿突倾斜度、颈椎平面倾斜度与眶耳平面、腭平面、咬合平面、下颌平面的倾斜度之间均呈正相关，齿突前倾时，各平面倾斜度大；③下颌偏斜者第2颈椎到第4颈椎的弯曲度与齿突倾斜度、颈椎平面倾斜度呈负相关，齿突前倾时，上位颈椎弯曲度小，齿突后倾时，上位颈椎弯曲度增加。结论：颌面形态与上位颈椎的倾斜有明显相关关系；下颌偏斜者的颌面形态、颈椎姿势与正常牙 合者有明显差异。
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