FREE RDA Radiographic Techniques and Errors Questions and Answers

Question 1

The radiographic error known as 'elongation,' where teeth appear stretched out, is caused by:

Accepted Answer

Insufficient vertical angulation

Answer

Excessive vertical angulation

Answer

Incorrect horizontal angulation

Answer

Placing the film backwards

Question 2

Overlapping of the interproximal contacts on a bitewing radiograph is a common error caused by:

Accepted Answer

Incorrect horizontal angulation

Answer

Incorrect vertical angulation

Answer

Patient movement

Answer

Film bending

Question 3

A 'cone cut' error on a radiograph appears as a clear, unexposed crescent or straight line and is caused by:

Accepted Answer

The PID not being centered over the film

Answer

The patient swallowing during exposure

Answer

Using exhausted developer solution

Answer

Reversing the film in the mouth

Question 4

In the paralleling technique, the central ray of the x-ray beam is directed:

Accepted Answer

Perpendicular to the film and the long axis of the tooth

Answer

Parallel to the long axis of the tooth

Answer

Perpendicular to the bisector of the angle

Answer

At a +10 degree vertical angulation

Question 5

The radiographic error that results in images appearing shorter and more stout than their actual size is called foreshortening. What is the cause?

Accepted Answer

Excessive vertical angulation

Answer

Insufficient vertical angulation

Answer

Incorrect film placement

Answer

Horizontal angulation being too mesial

Question 6

A processed radiograph that appears too dark (high in density) is likely the result of:

Accepted Answer

Excessive exposure time or overdevelopment

Answer

Underdevelopment or cool developer

Answer

Insufficient exposure time

Answer

Fixer solution contamination