作者对151例正常(牙合)人X线头影测量的二十个测量项目进行主成分和因子分析,结果表明,下切牙的位置在整个颅面结构中占有相当重要的位置,上下颌骨的位置及大小也是正常(牙合)颅面结构特征中比较关键的因素。通过少数几个因子即可尽可能地反映出颅面结构的全貌,同时也使X线头影测量结果的意义更明确,有利于初学者在临床上的直接应用。 The author of the 151 cases of normal (occlusal) X-ray cephalometric measurements of twenty subjects and principal component analysis and factor analysis showed that the location of the incisors in the craniofacial structure occupies a very important position, the upper and lower jaw Location and size of the normal (occlusal) craniofacial structural characteristics of the more critical factors. Through a few factors can reflect as much as possible the whole picture of the craniofacial structure, but also make the significance of X-cephalometry results more explicit, is conducive to beginners in the clinical application.