DEN 130 1 H - Dental Radiology- 42

These flashcards cover key concepts from the Extraoral Imaging lecture, focusing on definitions, functions, and common errors associated with panoramic and CBCT imaging.

What is the purpose of extraoral imaging?

To examine large areas of the skull or jaw when patients can't open their mouths for film placement.

What are the uses of panoramic imaging?

To locate impacted teeth, detect jaw lesions, and observe eruption patterns.

What has improved the diagnostic capability of panoramic imaging?

The introduction of full-featured digital panoramic units.

How does a cone beam computed tomography (CBCT) differ from a CT scan?

CBCT provides three-dimensional imaging specialized for dental structures, whereas CT scans are general and less focused.

What are common errors in patient preparation for panoramic imaging?

Ghost images from retained radiodense objects and lead apron artifacts.

What is a focal trough?

An imaginary three-dimensional curved zone where structures appear clear on a panoramic radiograph.

What happens if the patient’s chin is positioned too high during panoramic imaging?

The hard palate and floor of the nasal cavity may appear superimposed over the roots of the maxillary teeth.

What are the advantages of cone beam computed tomography (CBCT)?

Provides 3D views, enhances diagnostic abilities, and can visualize soft tissue.

What is the main function of the head positioner in panoramic imaging?

To align the patient's teeth accurately within the focal trough.

What will occur if the patient’s lips are not closed during panoramic film exposure?

A dark radiolucent shadow will obscure the anterior teeth.

What is the impact of the vertical angulation not being adjustable in a panoramic tubehead?

The tubehead design limits the flexibility for adapting to varying patient anatomies.

Which panoramic film projection is commonly used to evaluate facial growth?

Lateral cephalometric projection.

Why are skull radiographs challenging to interpret?

Because of the numerous overlapping anatomic structures.