DRC Image Acquisition & Interpretation 2

Question 1

A patient's mandibular molar periapical radiograph shows the apices cut off. Which receptor placement error caused this?

Accepted Answer

Receptor not extended beyond the apices

Answer

The receptor must extend at least 5mm beyond the apex to ensure complete visualization of the root and periapical region.

Question 2

Which of the following best describes the appearance of a periapical abscess on a radiograph?

Accepted Answer

Poorly defined radiolucency at the apex

Answer

A periapical abscess typically appears as a poorly defined (diffuse) radiolucency at or surrounding the root apex.

Question 3

When using the paralleling technique, the central ray should be directed:

Accepted Answer

Perpendicular to both the receptor and the long axis of the tooth

Answer

In the paralleling technique, the central ray is directed perpendicular to both the receptor and the long axis of the tooth to minimize distortion.

Question 4

Which of the following radiographic findings is characteristic of internal resorption?

Accepted Answer

Round or oval radiolucency within the root canal

Answer

Internal resorption appears as a round or oval-shaped radiolucency within the root canal, expanding the canal from within.

Question 5

A 'double image' artifact on a digital sensor is most likely caused by:

Accepted Answer

Movement of the receptor during exposure

Answer

Movement of the receptor or patient during exposure causes a blurred or double image due to recording two positions simultaneously.

(DRC) Dental Radiology Certification for Dental Hygienist Practice Test