DHED 409: Exam 1

Density

overall darkness

what controls contrast?

kVp

What zone in a panoramic contains all the teeth

zone 6

What zone shows the top middle of the panoramic?

Zone 1

Patient preparation for a pano

take-off rpd, earrings, glasses, any piercings, hair accessories, hearing aids, and dentures

"true image" on a pano

occurs when structure lies between the receptor and rotation center

Double image

when structure is behind the moving rotation center and is penetrated twice by x-ray beam

Ghost image

when structure outside of image layer and close to x-ray source resembles the real image but opposite side and blurred

Ghost image example picture

lead apron on pano picture

What are the panoramic facial planes?

-Midsagittal

-Frankfort

-Canine

If midsagittal is not line up right on a pano what are the errors?

Tilted and or twisted

If the patient is tilted the panoramic will look like

Condyles will look higher on one side

Tilted panoramic picture

If the patient is twisted the panoramic will look like

one side of the ramus will look bigger than the other side

Twisted panoramic image

The Frankfort plane is

imaginary line that passes under the floor of the orbit to the external auditory meatus

What two Errors may happen with the frnakfort plane

chin too up or too down

If the chin is to up the panoramic will look like a

frown

If the chin is to down the panoramic will look like a

big smile

chin too up on panoramic picture

chin down on a panoramic picture

If the canine plane is too far forward

-thin anterior teeth

-shadow of the ramus is present of both sides

If the canine plane is too far back

-spine is present

-large wide teeth

if the patient is slumped you will see

shadow of the spine near zone 5

Slumped position panoramic picture

if the tongue is raised

radiopaque line

tongue when not raised on a panoramic

picture