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目的：建立一种Ｘ线头影测量分析的新方法，并建立相应的正常值。方法：选择符合Ａｎ－ｄｒｅｗｓ正常牙合、面部比例协调的中国人８０例，男女各４０例，平均年龄２１．９岁，通过测量常用参照平面与Ｎ－Ｍｅ夹角的均数、标准差、最小值、最大值及极差。结果：发现Ｂｏ－Ｎ－Ｍｅ均数非常接近６０°，且具有最小的标准差和极差。依据与Ｂｏｌｔｏｎ平面呈６０°角平面为参考平面，称之为鼻根垂直线（ｎａｓｉｏｎｖｅｒｔｉｃａｌ，ＮＶ），建立一种Ｘ线头影测量方法。结论：鼻根垂直线分析方法是一种全新的头影测量新方法，可同时对上颌与颅骨、下颌与颅骨、上下颌基骨、牙齿与颅骨、牙齿与基骨以及面部垂直关系作出评价。
Objective: To establish a new method of X-ray cephalometric analysis and establish corresponding normal values. Methods: Eighty Chinese were enrolled in this study. The average age was 21.9 years. By measuring the mean and standard deviation of the angle between common reference plane and N-Me, Minimum, maximum and very poor. Results: The mean Bo-N-Me was found to be very close to 60 ° with the smallest standard deviation and very poor. According to the plane of Bolton was 60 ° angle plane as the reference plane, called the nasion vertical line (nasionvertical, NV), the establishment of a method of X-cephalometry. Conclusion: The method of analyzing the vertical line of nasal root is a new method of cephalometric measurement. The vertical relationship between maxilla and skull, mandible and skull, maxillary and mandibular base, dental and skull, tooth and base bone and facial can be evaluated simultaneously.