DENA 1390 ch 42 test review

Extraoral images are taken when large areas of the ___ or __ need to be examined?

Skull or Jaw

A panoramic image allows the dentist to view the entire dentition and related structures on a single ___?

Image

_____ images may be used to supplement a panoramic radiograph

Bitewing

Two types of panoramic units:

Film-based imaging and digital imaging

In panoramic imaging, what rotates around the patient?

Both the image receptor and tubehead

The ___ trough is the curved zone where structures appear clear in a panoramic

Focal

Another name for the focal trough?

Image layer

Structures positioned outside the focal trough appear ___ or ___?

Blurred or indistint

The collimator in a panoramic machine contains a what?

Narrow vertical slit

Unlike an intraoral tubehead the vertical angulation of the panoramic tubehead is not ___?

Adjustable

The head positioner includes a chin rest, forehead rest, bite-block, and lateral head __

Support

Exposure controls allow adjustment of what?

Milliamperage and Kilovoltage

In a panoramic imaging, what could not be changed?

The exposure time

Intensifying screens contain ___ that emit visible light

Phosphors

A phosphor plate system does NOT require what?

An intensifying screen

Which image occurs when metallic obljects are not removed before exposure?

Ghost image

What images appear blurred and larger than the original object?

Ghost images

A lead apron used during panoramic imaging should NOT have a what?

A thyroid collar

During a panoramic exposure, the patients lips must be ___ around the bite-block ( causes radiolucent shadow over anterior lips

Closed

Failure to place the tongue against a palate results in a radiolucent shadow over the apices of the _____?

Maxillary teeth

If the chin is tipped to high, a ___ smile line appears on the panoramic image.

Flat

Which plane should be parallel to the floor during panoramic imaging?

Frankfort

If the chin is tipped too low, an exaggerated ___ line appears on the image

Smile

When the patient is positioned too far back on the bike block, Anterior teeth appear, how?

Widened and blurred

When the patient is positioned too far forward on the bike block, anterior teeth appear how?

Narrowed and blurred

If the spine (patient) is not straight during exposure, the ____ spine may be superimposed over the image

Cervical

Cone Beam computed tomography provides ____- dimensional views of oral structures

3D

CBCT is commonly used to assist with what?

Proper implant placement planning

A____ is used with extra oral imaging to reduce scatter radiation reaching the film

Grid