Exam 1.11: Panographic Radiography

Question 1

A pan would be good for getting more details about a lesion whose borders extend past what?

Answer 1

The edge of intraoral radiographs

Question 2

What type of traumatic injuries are pan’s especially good for

Answer 2

Mandible injury to evaluate a fracture and then subsequent fracture healing after treatment

Question 3

Pans are good for evaluation of third molars. Besides the tooth’s location what other factors are being considered

Answer 3

Proximity to the neurovascular bundle or maxillary antrum

Question 4

What is a pan good for, especially for patients between the ages of 6-12?

Answer 4

Mixed dentition analysis

Question 5

How might a pan help when evaluating a fibrous dysplasia?

Answer 5

Evaluation of asymmetry of swelling

Question 6

How might a pan be of use to a dentist designing new dentures for a patient

Answer 6

Examining the relationship of the crest of the ridge to the mandibular canal, floor of the nose and sinuses

Question 7

What sinus is typically evaluated using a pan

Answer 7

Maxillary

Question 8

What type of TMD could be evaluated with a pan

Answer 8

Osseous symptoms, like degeneration and arthritis

Question 9

if you have already taken a baseline pan, what do you need to have in order to justify taking another f/u pan?

Answer 9

Clinical evidence of disease

Question 10

What errors will be caused if the patient is positioned with their chin down?

Answer 10

V shaped mandibular profile
Exagerrated curve of spee
V shaped hard palate
Condyles might be off of film

Question 11

What errors will be caused if the patient is positioned with their chin up

Answer 11

Flat mandibular profile
Flat or reversed curve of spee
Inverted hard palate

Question 12

What errors occur if the patient is seated too far forward

Answer 12

Teeth (especially anterior) seem narrow
Cervical spine overwhelms the rami
Structures are blurred

Question 13

What error occur if the patient is seated too far back

Answer 13

Teeth seem wide

Cervical spine disappears off of the lateral edge of film

Question 14

What errors occur if the patient’s head is twisted

Answer 14

Teeth on the side the patient is facing will be close to the tubehead and will appear wide
Opposite side teeth will appear narrow

Question 15

What errors will occur if the head is tilted

Answer 15

Image of angle of mandible and earlobe will be lower on one side than the other

Question 16

What positioning error will cause partially opaque triangles to appear over anterior mandible

Answer 16

slumping neck

Question 17

Branching, thin radiolucent line with a fern like pattern are caused by what technical error

Answer 17

Static electricity caused by pulling a screen film combo out of a plastic cassette quickly in low humidity

Question 18

Thin opaque lines of uniform width appear in the same location on every film taken

Answer 18

Scratched/cracked intensifying screen

Question 19

What technical error will cause thin, cruvilinear radiolucencies where film was held too tightly

Answer 19

Pressure mark

Question 20

What is it called when the images of two sets of jaws appears on the same film

Answer 20

double exposure

Question 21

What happens in a light leak technical error?

Answer 21

Radiolucent line or zone will appear in the same place on all films taken with that cassette

Question 22

How would an incomplete exposure occur?

Answer 22

By not holding down the xray button until the beep

Question 23

What is is called when you over expose film by turning the darkroom lights on prematurely

Answer 23

darkroom exposure

Question 24

Moisture droplets will appear like what on the image

Answer 24

radiolucent circles

Question 25

What causes a film to be too dark on a pan? How do you adjust for it?

Answer 25

Overexposure. You can’t adjust time of exposure so you must reduce the kVp