Omran Ahmed, Wertheim David, Smith Kathryn, Liu Ching Yiu Jessica, Naini Farhad B
Kingston Hospital NHS Foundation Trust, Galsworthy Road, Kingston upon Thames, KT2 7QB, UK.
School of Computer Science and Mathematics, Faculty of Science, Engineering and Computing, Kingston University, Penrhyn Road, Kingston upon Thames, Surrey, KT1 2EE, UK.
Maxillofac Plast Reconstr Surg. 2020 Oct 31;42(1):37. doi: 10.1186/s40902-020-00282-3.
The human mandible is variable in shape, size and position and any deviation from normal can affect the facial appearance and dental occlusion.
The objectives of this study were to determine whether the Sassouni cephalometric analysis could help predict two-dimensional mandibular shape in humans using cephalometric planes and landmarks.
A retrospective computerised analysis of 100 lateral cephalometric radiographs taken at Kingston Hospital Orthodontic Department was carried out.
Results showed that the Euclidean straight-line mean difference between the estimated position of gonion and traced position of gonion was 7.89 mm and the Euclidean straight-line mean difference between the estimated position of pogonion and the traced position of pogonion was 11.15 mm. The length of the anterior cranial base as measured by sella-nasion was positively correlated with the length of the mandibular body gonion-menton, r = 0.381 and regression analysis showed the length of the anterior cranial base sella-nasion could be predictive of the length of the mandibular body gonion-menton by the equation 22.65 + 0.5426x, where x = length of the anterior cranial base (SN). There was a significant association with convex shaped palates and oblique shaped mandibles, p = 0.0004.
The method described in this study can be used to help estimate the position of cephalometric points gonion and pogonion and thereby sagittal mandibular length. This method is more accurate in skeletal class I cases and therefore has potential applications in craniofacial anthropology and the 'missing mandible' problem in forensic and archaeological reconstruction.
人类下颌骨在形状、大小和位置上存在差异，任何偏离正常的情况都可能影响面部外观和牙合关系。
本研究的目的是确定萨苏尼头影测量分析是否有助于使用头影测量平面和标志点预测人类二维下颌骨形状。
对在金斯顿医院正畸科拍摄的100张侧位头影测量X线片进行回顾性计算机分析。
结果显示，下颌角估计位置与下颌角追踪位置之间的欧几里得直线平均差异为7.89mm，颏前点估计位置与颏前点追踪位置之间的欧几里得直线平均差异为11.15mm。以蝶鞍-鼻根点测量的前颅底长度与下颌体下颌角-颏下点长度呈正相关，r = 0.381，回归分析显示，前颅底蝶鞍-鼻根点长度可通过方程22.65 + 0.5426x预测下颌体下颌角-颏下点长度，其中x = 前颅底（SN）长度。腭部呈凸形与下颌骨呈斜形之间存在显著关联，p = 0.0004。
本研究中描述的方法可用于帮助估计头影测量点下颌角和颏前点的位置，从而估计下颌骨矢状长度。该方法在骨骼I类病例中更准确，因此在颅面人类学以及法医和考古重建中的“缺失下颌骨”问题方面具有潜在应用价值。
