NBDHE Dental Radiography and Interpretation 2

Question 1

Which radiographic technique uses a horizontal angulation of 0° and a vertical angulation of +8° to +10° for mandibular premolars in the paralleling technique?

Accepted Answer

The beam is directed perpendicular to the long axis of the teeth and the film/sensor, with specific vertical angulation per region

Answer

A bisecting angle approach with steeper vertical angles

Answer

An occlusal projection technique

Answer

A panoramic technique

Question 2

A periapical radiograph showing a well-defined radiolucency with a sclerotic border at the apex of a vital tooth is MOST likely:

Accepted Answer

Periapical cemento-osseous dysplasia (early stage)

Answer

Periapical abscess

Answer

Periapical granuloma

Answer

Periapical cyst

Question 3

The maximum permissible dose (MPD) of ionizing radiation for an occupationally exposed dental worker per year in the U.S. is:

Accepted Answer

50 mSv (5 rem) per year

Answer

100 mSv (10 rem) per year

Answer

20 mSv (2 rem) per year

Answer

5 mSv (0.5 rem) per year

Question 4

Elongation on a periapical radiograph using the bisecting angle technique is caused by:

Accepted Answer

Insufficient vertical angulation (too flat/shallow)

Answer

Excessive vertical angulation (too steep)

Answer

Incorrect horizontal angulation

Answer

Film/sensor placement too close to the teeth

Question 5

On a panoramic radiograph, the 'ghost image' artifact is caused by:

Accepted Answer

A radiopaque structure on the contralateral side projecting across the midline at a higher and more blurred level

Answer

Metallic objects left on the patient's body

Answer

Movement of the patient during the exposure

Answer

Film/sensor placement outside the focal trough

Question 6

Which type of dental radiograph is BEST for evaluating the crestal bone height in a periodontal patient?

Accepted Answer

Vertical bitewing radiograph

Answer

Horizontal bitewing radiograph

Answer

Periapical radiograph

Answer

Panoramic radiograph