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目的:用Andrews六要素对西安地区汉族正常牙合人群的侧貌形态进行初步分析。方法:在西安地区汉族个别正常牙合人群中选择95例,其中女48例、男47例(18~30岁),拍摄X线头颅侧位定位片和侧面像,选择4个软组织标志点、3个硬组织标志点,根据Andrews六要素中侧貌的美学分析指标,用Nemo Ceph NX软件测量上颌中切牙颊面中心(FA点)与GALL线的位置关系、下颌中切牙颊面中心(FA点)到硬组织颏下点间距离与眉间点到鼻下点距离的关系、鼻下点到软组织颏下点的距离与眉间点到鼻下点距离的关系、硬组织颏前点与Will线的关系,并进行统计学分析。结果:西安地区汉族个别正常牙合人群中,上颌中切牙FA点基本落于GALL线前后1 mm内,且多数落于GALL线偏后方;眉间点至鼻下点的距离、鼻下点至软组织颏下点的距离与外耳道点至软组织下颌角点的距离相近;FA点至硬组织颏下点的距离近似于外耳道点至硬组织下颌角点距离的1/2;硬组织颏前点落在Will线前后1 mm内,大多落在Will线稍后方,且与性别无关。结论:西安地区汉族正常牙合人群侧貌符合Andrews六要素中对侧貌的要求。
OBJECTIVE: To analyze the morphology of Han nationality occlusion in Xi’an with six elements of Andrews. Methods: Ninety-five cases (48 males and 47 males (18-30 years old)) were selected from the normal occlusion population of Han nationality in Xi’an. Four X-ray flaps and lateral images were selected. Four soft tissue markers were selected, According to the aesthetic analysis indexes of the topography of six elements of Andrews, the relationship between the buccal center (FA point) and the GALL line of the maxillary central incisor was measured by Nemo Ceph NX software. The center of buccal center (FA point) to the distance between the submental point of the hard tissue and the distance between the eyebrow and the nose, the distance from the nasal point to the submental point of the soft tissue and the distance between the eyebrow and the nose, Points and the relationship between the Will line, and statistical analysis. Results: In the normal Han population in Xi’an, FA points of the maxillary central incisors basically fell within 1 mm before and after the GALL line, and most of them fell behind the GALL line. The distance between the eyebrow and the nose, The distance between the submental point to the soft tissue and the mandibular angle from the external auditory canal to the soft tissue was similar. The distance from the FA point to the submental point of the hard tissue was approximately 1/2 of the distance from the external auditory meatus to the mandibular angle of the hard tissue. Falls within 1 mm around the Will line, mostly falls behind the Will line, and has nothing to do with gender. Conclusion: The normal occlusion population of Han nationality in Xi’an meets the requirements of the four features of Andrews.