WorksheetsChapter 42-- Extraoral Imaging
Total questions: 20
Worksheet time: 7mins
Advantages of panoramic imaging, when contrasted with intraoral imaging, include
no focal trough limitations.
lower equipment cost.
less radiation exposure.
Both A and C.
The ______ used in the panoramic x-ray machine tubehead is a lead plate with an opening shaped like a narrow vertical slit.
filament
filter
collimator
cephalostat
Check all that apply.
Skull radiography is most often used in
Oral Surgery
Endodontics
Periodontics
Oshadontics
Orthodontics
A patient wearing earrings or glasses must remove them before a panoramic x-ray image exposure; otherwise, a _____ will appear on the image.
Exaggerated Smile Line
Ghost Image
Visible Spine
Exaggerated Reverse Smile
When a patient’s chin is positioned too low during the panoramic exposure
the condyles will not be visible.
detail in the posterior apical regions will be lost.
the mandibular incisors will appear blurred.
Both A and C occur
A panoramic image allows the dentist to do all of the following except
determine if a tooth is percussion sensitive.
view the maxillary sinus
view the entire dentition and related structures in one film.
detect caries.
When a patient’s teeth are not positioned in the groove of the bite-block and are too far forward, the teeth will appear
fat
tall
short
skinny
The _______ is an imaginary three-dimensional curved horseshoe shaped area or space.
focal trough
filament
tungsten target
none of the above
_____ decreases the film fog, increasing the contrast of the extraoral image.
collimator
lead foil
filament
grid
none of the above
The purpose of the head positioner is to position the patient correctly in the
Frankfort plane.
central ray.
occlusal vertical dimension.
focal trough.
When the cervical spine will appear as a radiopacity in the center of the film, obscuring the diagnostic information is a result of _____________
ghost image
lead apron artifact
anterior focal trough
posterior focal trough
patient does not stand or sit with a straight spine
When the patient’s jaws are outside the focal trough, the resulting images are
too light.
blurred.
ghost images.
doubled.
all of the above
A radiopaque cone-shaped artifact on a panoramic image that interferes with the diagnostic information is caused by the
patient’s lead apron being incorrectly placed or a lead apron with a thyroid collar being used.
patient’s chin being too high during the procedure
patient’s head being posterior to the focal trough.
patient moving during the procedure.
The posteroanterior projection shows
shows the bones of the face and skull, as well as the soft tissue profile
joint shows the bone and the relationship of the jaw joint.
the frontal and ethmoid sinuses, the orbits, and the nasal cavities
all of the above
none of the above
The lateral cephalometric projection shows
the frontal and ethmoid sinuses, the orbits, and the nasal cavities.
the bone and the relationship of the jaw joint.
the bones of the face and skull, as well as the soft tissue profile
none of the above
all of the above
The temporomandibular joint shows
the bone and the relationship of the jaw joint.
the frontal and ethmoid sinuses, the orbits, and the nasal cavities.
the bones of the face and skull, as well as the soft tissue profile.
all of the above
The quality of the panoramic view depends on
how closely the patient’s jaw conforms to the focal trough.
the size of the patient’s jaw.
how the patient’s jaw is positioned within the focal trough.
All of the above.
None of the above
All of the following statements about panoramic imaging are true except
with film-based imaging, bitewings need to be taken to detect decay.
the digital panoramic unit uses film that has to be processed.
a digital panoramic unit can reveal a small interproximal carious lesion, eliminating the need to take bitewing images.
panoramic images are primarily used for locating impacted teeth, lesions in the jaw, and eruption patterns.
A ghost image will appear _____ than normal and on the _____ side of the image.
larger; same
smaller; opposite
smaller; same
larger; opposite
In panoramic imaging, _____ rotate(s) around the patient.
the image receptor but not the tubehead
neither the image receptor nor the tubehead
the tubehead but not the image receptor
both the image receptor and the tubehead
