Orthodontic Assistant Practice Exam

Cephalometric tracings are typically made over which type of imaging?

1. Intraoral radiographs

2. Extraoral radiographs

3. Panoramic radiographs

4. 3D imaging scans

The correct answer is: Extraoral radiographs

Cephalometric tracings are primarily made over extraoral radiographs, which provide side views of the skull and facial structures. This type of imaging captures crucial anatomical details by projecting them onto a two-dimensional plane, allowing orthodontists to analyze the relationships between different craniofacial components. The information gathered through cephalometric analysis is vital for planning orthodontic treatments, as it helps assess the position of the teeth, mandible, and maxilla, as well as the overall facial growth pattern. In contrast, intraoral radiographs capture images within the mouth and are not suitable for cephalometric analysis, as they do not show the broader craniofacial relationships necessary for such evaluations. Panoramic radiographs give a broader view of the dental structures but still do not provide the specific measurements required for cephalometric analysis. Similarly, while 3D imaging scans offer a comprehensive view of the dental and skeletal structures, they are not traditionally used for cephalometric tracing, which relies on the standardized measurements and landmarks visible in extraoral radiographs.