The shape of the mandible

C.L.B. Lavelle , R. Greenwood
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引用次数: 1

Abstract

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.

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下颌骨的形状
传统的头颅测量技术在正颌手术诊断和计划中的有效性仍然存在争议。这不仅反映了线性和角度参数将尺寸和形状结合在一起的事实,而且这些技术通常依赖于非同源基准点,所得数据的数学意义值得怀疑。为了避免这些问题,我们使用内侧(对称)轴变换技术来比较各种异常患者的侧位头像所获得的下颌形状。该技术以确定下颌形状的中央(内侧)轴为中心,并基于确定外周边界的相等加权点,而不依赖于颅成像方向。测量衍生的内轴及其相对方向描述了由于疾病和手术干预导致的下颌形状的显著变化。然而,需要进一步的研究来确定这种描述生物形状的特定技术是否有助于正颌手术的诊断和计划。
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