Abstract：
Accurate orthodontic analysis and diagnosis based on anatomical landmarks is essential to the success of orthodontic treatment. Helical computed tomography (CT) has evolved markedly, and dentists can now quickly obtain 3-dimensional (3D) reconstruction data using this imaging modality. The planning of orthodontic treatment had traditionally been based on cephalometric analysis using 2D landmarks. This study aimed to collect 3D morphological data using CT images to establish new landmarks for analysis and diagnosis in orthodontic treatment. Twenty male and 20 female adult Japanese dry skulls with of normal occlusion were selected. The skulls were scanned using a multidetector helical CT system (SIEMENS, Volume Zoom Plus 4, Germany). Models were reconstructed using 3D measurement software (Simplant, Dentsply Sirona, Tokyo, Japan) and 45 landmarks determined. Three-dimensional measurement for a total of 30 items representing these landmarks was then performed. The results provided 3D standard values for maxillofacial morphology in adult Japanese individuals with normal occlusion. These measurement items should allow the disadvantages of 2D cephalometric analysis to be overcome.
摘要：
基于解剖标志的准确正畸分析和诊断对于正畸治疗的成功至关重要。螺旋计算机断层扫描（CT）已经有了明显的发展，现在，牙医可以使用这种成像方式快速获得三维（3D）重建数据。传统上，正畸治疗的计划基于使用2D标志的头颅测量分析。本研究旨在使用CT图像收集3D形态学数据，以建立新的界标，以便在正畸治疗中进行分析和诊断。选择了20名正常咬合的男性和20名女性成年日本干头骨。使用多探测器螺旋CT系统扫描头骨(西门子，VolumeZoomPlus4，德国）。使用3D测量软件(Simplant，DentsplySirona,东京,日本）和确定的45个地标。然后对代表这些地标的总共30个项目进行三维测量。结果提供了正常咬合的成年日本人颌面部形态的3D标准值。这些测量项目应该允许克服2D头部测量分析的缺点。
