Exam 1.3: Intraoral Technique & Darkroom Errors

Question 1

What are the 4 Types of Radiograph Errors

Answer 1

1. Patient Preparation
2. Technique Errors
3. Exposure and Processing Errors
4. Film-Handling Errors

Question 2

What are the 2 sub-types of Patient Prep errors?

Answer 2

Radiopaque artifacts

Motion artifact

Question 3

2 common examples of radiopaque artifacts

Answer 3

Eyeglasses & Dental appliances

Question 4

What is the primary cause of motion artifact

Answer 4

Patient movement as a result of clinician not emphasizing the importance of staying very still

Question 5

Technique Errors: Appropriate Teeth - Why is it so important to make sure the right teeth are in frame?

Answer 5

Because each pic is designed to capture specific teeth and structures…..it helps minimize exposure

Question 6

What can cause the “Apices Cut off” Technique error

Answer 6

Film not positioned apically enough

Insufficient Vertical Angulation can project images off the film

Question 7

What technique error can cause a “herringbone” pattern to be superimposed on the image of the teeth?

Answer 7

Putting the film in backwards

Question 8

What is “Dot Artifact”…how can it be avoided

Answer 8

Film ID dot can interfere with important structures

Prevent by obeying “Dot in the Slot”

Question 9

What error can result in a double image?

Answer 9

Re-exposure of a previously exposed, but undeveloped film

Question 10

How is horizontal angulation related to diagnosing interproximal caries?

Answer 10

Horizontal angulation error can cause the image to have overlapping contacts making interproximal caries diagnosis impossible

Question 11

What arch is usually affected by vertical angulation errors?

Answer 11

Maxillary.

Foreshortened buccal roots and failure of the palatal and buccal cusp tips to align occur with too much vertical angulation

Question 12

What error will cause the image of the plastic positioning ring to show on the image?

Answer 12

Incorrectly assembling the film positioning device

Question 13

What error occurs when only part of the film is covered by the beam; and leaving the other part unexposed?

Answer 13

Cone Cut

Question 14

What is the 50% rule for BW

Answer 14

Equal amounts of maxillary and mandibular crown should be captured on the BW

Question 15

Exposure and Processing Errors:

What error results in the plastic film being clear with a blue tint?

Answer 15

Processing an unexposed film

Question 16

What are “Roller Streaks”

Answer 16

Radiolucent lines may appear on the film if the rollers in the automatic processor are dirty and sludge contaminates the film

Question 17

What happens if the film is exposed to light before processing?

Answer 17

The image will be ruined

Question 18

What type of film handling error occurs when radiolucent lines/curves end up on the image from bending the film or pressing too hard on it pre-exposure

Answer 18

Pressure marks

Question 19

What would cause a brown colored stain on a traditional (non digital) xray image

Answer 19

Insufficient removal of the chemical fixer

Question 20

What might cause film overlap?

Answer 20

Feeding films into the processor in too rapid succession