Forsberg C T, Burstone C J, Hanley K J
Am J Orthod. 1984 Mar;85(3):224-37. doi: 10.1016/0002-9416(84)90062-9.
The purpose of this study was to assess the reproducibility of landmarks visible in the submental-vertical radiographic projection. Ten subjects with at least a 2 mm apical base discrepancy as diagnosed by means of a posteroanterior headfilm were selected. Mean tracing and measurement error was found to be less than 1 mm for all landmarks. A system of patient orientation and radiographic technique is presented. The radiographs were made at 90 kVp, 15 mA, 1 second exposure, using Kodak Lanex X-D film with a speed of 600. A system of cephalometric analysis is presented for the assessment of skeletal asymmetry in the horizontal plane. This system of analysis uses landmarks within the cranial base, maxilla, and mandible to construct reference lines with which to assess asymmetry. These reference systems allow the assessment of asymmetry within each component part of the craniofacial complex as well as the relative relationship of these parts to one another. Examples are presented to demonstrate the use of this system in assessing skeletal asymmetry. These examples show how this system of analysis can be incorporated into the data base for a particular patient and how it can be useful in making treatment decisions for patients with skeletal asymmetries. This method lends itself to future incorporation into a three-dimensional computerized cephalometric analysis.
本研究的目的是评估颏下 - 垂直位X线投影中可见标志点的可重复性。通过后前位头颅片诊断出至少有2毫米根尖基底部差异的10名受试者被选中。发现所有标志点的平均描绘和测量误差均小于1毫米。本文介绍了一种患者定位和X线摄影技术系统。X线片在90千伏峰值、15毫安、1秒曝光条件下拍摄，使用速度为600的柯达Lanex X - D胶片。本文提出了一种用于评估水平面骨骼不对称性的头影测量分析系统。该分析系统利用颅底、上颌骨和下颌骨内的标志点构建参考线，用以评估不对称性。这些参考系统能够评估颅面复合体各组成部分内的不对称性以及这些部分彼此之间的相对关系。文中给出了示例，以展示该系统在评估骨骼不对称性方面的应用。这些示例展示了这种分析系统如何能够纳入特定患者的数据库，以及它在为骨骼不对称患者做出治疗决策时如何发挥作用。这种方法便于未来纳入三维计算机化头影测量分析。
