Thurow R C
Am J Orthod Dentofacial Orthop. 2000 Mar;117(3):298-302. doi: 10.1016/s0889-5406(00)70234-4.
An overview is presented of a new technique to improve the accuracy and reproducibility of earpost-dependent orientation in procedures such as cephalometric radiography and cast mounting, using a custom-molded ear canal insert to provide a stable fitted socket for more exact earpost fit. This is especially valuable in follow-up treatment and serial studies because the insert can be filed for future use on the same patient to provide identical positioning in successive registrations. Cephalometric radiography is further enhanced by the addition of a radiopaque x-ray marker deep in the canal, otherwise inaccessible, close to the bony ear canal (anatomical porion) and the mandibular condyle. This marker is also visible in all 3 cephalometric views-lateral, frontal (posteroanterior) and coronal (submental-vertex)-providing an exact common horizontal axis (Otic axis) for a three-dimensional Cartesian coordinate system of measurement.
本文概述了一种新技术，该技术用于提高诸如头颅测量放射摄影和模型安装等程序中依赖耳柱的定位的准确性和可重复性。该技术使用定制模制的耳道插入物，为更精确的耳柱适配提供稳定的适配插座。这在后续治疗和系列研究中特别有价值，因为该插入物可以存档以便将来在同一患者身上使用，从而在连续的记录中提供相同的定位。通过在耳道深处添加一个不透射线的X射线标记物，进一步增强了头颅测量放射摄影。否则，该标记物难以接近，它靠近骨性耳道（解剖学耳点）和下颌髁突。该标记物在所有三个头颅测量视图——侧位、正位（后前位）和冠状位（颏顶位）——中也可见，为三维笛卡尔测量坐标系提供了精确的公共水平轴（耳轴）。
