Ch 19: Paralleling Technique

Parallel is defined as

• moving or lying in the same plane, always separated by the same distance and not intersecting.

• cutting across or through.

• intersecting at or forming a right angle.

• an angle of 90 degrees formed by two lines perpendicular to each other.

To achieve parallelism between the receptor and the tooth, the ____________ distance must be increased to keep the receptor parallel with the long axis of the tooth.

• target-object

• object-receptor

• target-receptor

• operator-patient

Image magnification occurs with the paralleling technique when the ______________ distance is increased.

• target-receptor

• operator-patient

• object-receptor

• target-object

(1) The American Dental Association (ADA) and the American Academy of Oral and Maxillofacial Radiology both recommend the use of a beam alignment device to reduce the amount of radiation the patient receives. (2) Limiting the size of the x-ray beam not only reduces the amount of skin that is exposed but also results in a significant reduction of radiation to the patient, by as much as 20%.

• Both statements are true.

• Both statements are false.

• The first statement is true; the second statement is false.

• The first statement is false; the second statement is true.

Which of the following is a disposable receptor holder designed for one-time use only?

• Rinn XCP instruments

• Precision receptor holders

• Stabe bite-block

• Snap-a-ray receptor holder

The text recommends using a size ____ receptor for anterior teeth and a size ____ receptor for posterior teeth.

• 1; 2

• 1; 1

• 2; 2

• 2; 1

According to the text, a size 1 receptor is always positioned with the long portion of the receptor in a ____________ direction, and a size 2 receptor is typically positioned with the long portion of the receptor in a ______________ direction.

• vertical; vertical

• horizontal; horizontal

• vertical; horizontal

• horizontal; vertical

(1) The dental radiographer should be careful not to stimulate the patient’s gag reflex. (2) Once the gag reflex is stimulated, the patient may gag on receptors that could normally be tolerated.

• Both statements are true.

• Both statements are false.

• The first statement is true; the second statement is false.

• The first statement is false; the second statement is true.

If you are using size 1 receptors, how many exposures will you need to take of the anterior teeth?

• Four

• Six

• Seven

• Eight

If you are taking an anterior image sequence, which tooth do the text recommends you begin with?

• 6

• 8

• 9

• 11