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20 Cards in this Set

  • Front
  • Back

A panoramic radiograph is valuable when diagnosing each of the following EXCEPT one. Which one is the EXCEPTION?

Recurrent caries

Which of these is an advantage of a panoramic radiograph when compared to an intraoral radiograph?

A larger region is recorded

Which of these is a limitation of a panoramic radiograph when compared to an intraoral radiograph?

Superimposition of structures may make interpretation difficult.

What is the term given to the technique where a slice of tissue is exposed distinctly, whereas structures outside the designated area are blurred our of the image?

Tomography

All panoramic radiographs have 10 to 30 percent magnification.


It is desirable to keep the magnification less in the anterior region and greater in the posterior region.

The first statement is true. The second statement is false.

The panoramic PID is collimated to what shape?

Narrow slit

What term is given to the area where structures will be imaged with relative clarity, whereas structures outside this area are blurred out of the image?

Focal trough

Each of the following is a component of the panoramic x-ray machine EXCEPT one. Which one is the EXCEPTION?

Variable exposure timer

Which dimension of the focal trough does the biteblock of the panoramic x-ray machine assist the operator with positioning?

Anterior-posterior

Which of the following planes is used to position the patient correctly within the superior-inferior (up-down) dimension?

Both (a) and (b)


Ala-tragus line


Frankfort plane

Which of the following positioning errors results in anterior teeth that are blurry and narrowed in size?

Too far forward in the focal trough

When the dental arches are rotated to the left, the teeth on the right side will be positioned closer to the image receptor.


The teeth closer to the image receptor will appear blurry and magnified.

Both statements are false.

Which of the following positioning errors results in an exaggerated "smile" appearance of the arches?

Chin tipped too far down.

The appearance of a large radiolucency that obscures the maxillary teeth apices results when

the tongue is not resting on the palate during exposure.

Which of the following appears radiolucent on a panoramic radiograph?

Nasal cavity

Which of the following appears radiopaque on the panoramic radiograph?

Zygomatic process of the maxilla

Which of the following could be called a negative shadow?

Glossopharyngeal air space

List three air spaces that may be recorded on panoramic radiographs.

(1) Palatoglossal air space


(2) Nasopharyngeal air space


(3) Glossopharyngeal air space


List three machine parts that may be recorded on panoramic radiographs.

(1) Biteblock


(2) Chin rest


(3) Side positioner guides

What is the term given to a structure that is recorded a second time, with less sharpness, and on the opposite side?

Ghost Image