NBDHE NBDHE Dental Radiography and Interpretation 5

Question 1

Which of the following is a characteristic radiographic feature of condensing osteitis?

Accepted Answer

Well-defined radiopaque mass at the apex of a tooth with pulpal pathology

Answer

Condensing osteitis presents as a focal sclerotic bone reaction appearing as a well-defined radiopaque area at the apex of a tooth with chronic low-grade pulpal inflammation.

Question 2

The geometric factor that most affects image sharpness is the:

Accepted Answer

Source-to-object distance

Answer

Increasing the source-to-object distance (focal spot to tooth distance) reduces penumbra and improves image sharpness.

Question 3

Which radiographic technique minimizes the overlap of proximal surfaces on a bitewing radiograph?

Accepted Answer

Directing the central ray through the contact points using correct horizontal angulation

Answer

Correct horizontal angulation directs the X-ray beam through the interproximal contacts, preventing overlapping of adjacent tooth surfaces.

Question 4

On a panoramic radiograph, which artifact results from the patient's tongue not being in contact with the palate during exposure?

Accepted Answer

A radiolucent band across the roots of the maxillary teeth

Answer

When the tongue is not positioned against the palate, an air space creates a dark radiolucent shadow (shadow of the air space) across the roots of the maxillary teeth.

Question 5

The latent image on conventional radiographic film is formed by:

Accepted Answer

Interaction of X-ray photons with silver halide crystals in the emulsion

Answer

X-ray photons interact with silver halide crystals in the film emulsion, liberating electrons that reduce silver ions and form a latent (invisible) image.

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NBDHE NBDHE Dental Radiography and Interpretation 5