Lavelle C L, Greenwood R
Int J Oral Surg. 1985 Dec;14(6):517-25. doi: 10.1016/s0300-9785(85)80058-2.
The validity of traditional cephalometric techniques for orthognathic surgical diagnosis and planning remains controversial. This not only reflects the fact that the linear and angular parameters combine size and shape together, but the techniques also generally rely upon non-homologous datum points, with the resultant data being of dubious mathematical significance. In order to circumvent these problems, the technique of medial (symmetric) axis transformation was used to compare mandibular shapes derived from lateral cephalographs of patients with various anomalies. This technique centers on defining the central (medial) axes of mandibular form and is based on equal weighting of points defining the peripheral border independent of cephalographic orientation. Measurement of the derived medial axes and their relative orientation described marked changes in mandibular shape resulting from pathosis and surgical intervention. However, further research is required to ascertain whether this specific technique for the description of biologic shape facilitates orthognathic surgical diagnosis and planning.
传统头影测量技术在正颌外科诊断和治疗计划中的有效性仍存在争议。这不仅反映了线性和角度参数将大小和形状结合在一起的事实，而且这些技术通常还依赖于非同源基准点，所得数据的数学意义值得怀疑。为了规避这些问题，采用了中轴线（对称）变换技术来比较患有各种异常的患者的侧位头影图得出的下颌骨形状。该技术的核心是定义下颌骨形态的中心（中轴线），并基于定义周边边界的点的等权重，而与头影测量方向无关。对得出的中轴线及其相对方向的测量描述了病变和手术干预导致的下颌骨形状的显著变化。然而，还需要进一步研究以确定这种描述生物形状的特定技术是否有助于正颌外科诊断和治疗计划。
