When are extra oral radiographs needed?
When large areas of the skull or jaw must be examined, or when patients are unable to open their mouths for image receptor placement.
What types of film might be needed to supplement a panoramic image? Why?
Bitewing films are used to supplement a panoramic film to detect dental caries or periapical lesions. The images on a panoramic film are not as well defined or clear as the images on intraoral film.
What is a focal trough?
Imaginary three-dimensional horse-shoe shaped zone used to focus panoramic radiographs.
Why is a CBCT image better than a two-dimensional image?
The two-dimensional can't provide any information about the buccal or lingual width or locations, nor can they distinguish between types of soft tissues.
Is it difficult to learn to use a CBCT machine?
No but time for training is necessary.
What is the purpose of extra oral radiographs?
Overall image of the skull and jaws
What is the name of the device that may be added to a panoramic unit to allow the operator to easily position the film and patient?
Cephalostat
What is the purpose of a grid?
Device used to reduce the amount of scatter radiation that reaches an extra oral film during exposure.
What type of imaging is best for soft tissues of the TMJ?
Arthrography and CBCT