Question 1

In the paralleling technique, how should the film/sensor be positioned relative to the long axis of the tooth?

Accepted Answer

The film/sensor should be placed parallel to the long axis of the tooth, with the central ray directed perpendicular to both the tooth and the film.

Question 2

What is the primary advantage of the paralleling technique over the bisecting angle technique?

Accepted Answer

The paralleling technique produces less image distortion and more accurately represents the true shape and length of teeth because the film is parallel to the tooth.

Question 3

In the bisecting angle technique, where is the central ray directed?

Accepted Answer

The central ray is directed perpendicular to an imaginary line that bisects the angle formed between the long axis of the tooth and the plane of the film.

Question 4

Which film-holding instrument is most commonly recommended for the paralleling technique?

Accepted Answer

A Rinn XCP (Extension Cone Paralleling) instrument or equivalent film-holding device is recommended because it holds the film parallel to the tooth and guides beam angulation.

Question 5

When taking a bitewing radiograph, where is the film/sensor positioned vertically?

Accepted Answer

The film is centered horizontally to cover both the maxillary and mandibular posterior teeth, with the occlusal plane bisecting the film and the tab centered in the patient's bite.

Radiographic Techniques – DANB Dental Assistant Certification

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