DRC Radiographic Techniques & Procedures 3

Question 1

Which occlusal radiographic projection is used to examine the entire maxillary arch in one image?

Accepted Answer

Maxillary topographic occlusal

Answer

The maxillary topographic occlusal projection uses a large receptor placed horizontally in the palate to capture the entire maxillary arch in a single image.

Question 2

For a patient with a strong gag reflex, which modification can help when exposing maxillary posterior periapical radiographs?

Accepted Answer

Use the bisecting angle technique instead of paralleling

Answer

The bisecting angle technique allows the receptor to be placed closer to the teeth (not deep in the palate), reducing stimulation of the gag reflex compared to paralleling technique.

Question 3

When taking a bitewing radiograph, the correct horizontal angulation directs the central beam:

Accepted Answer

Perpendicular to the curvature of the arch through the contact points

Answer

Correct horizontal angulation positions the beam perpendicular to the dental arch and directed through the contact points to open them on the radiograph.

Question 4

A periapical radiograph shows overlapping of posterior contact areas. The most likely cause is:

Accepted Answer

Incorrect horizontal angulation

Answer

Overlapping of contact areas results from incorrect horizontal angulation, where the beam is not directed perpendicular through the interproximal contacts.

Question 5

Which receptor size is most appropriate for a full-mouth series in an adult patient?

Accepted Answer

Size 1 for anteriors, size 2 for posteriors

Answer

A standard adult full-mouth series uses size 1 receptors for the narrower anterior teeth and size 2 receptors for the wider posterior areas.

(DRC) Dental Radiology Certification for Dental Hygienist Practice Test

(DRC) Dental Radiology Certification for Dental Hygienist Practice Test

DRC Radiographic Techniques & Procedures 3