ch 23 exam 3 extraoral radiography

the most common extraoral film is the

used to image large areas of the skull or jaws

The extraoral film is typically used for the following purposes (7)

Equipment for extraoral radiographs (5)

special extention arm used in conjunction with teh x-ray tube head

includes a film holderand head positioner that allow the dental radiographer to position both film and patient easily

Where is most extaoral film placed?

sensitive to the light emitted from intensifying screens

sizes of film most often used in extraoral film?

a nonscreen film that does not require the use of screens for exposure

film that requires more exposure

device that converts x-ray energy into visible light; the light then exposes the screen film

calcium tungstate screens emit what color light
rare earth screens emit what color light

which screens require less exposure

holds the film in tight contact with the intensifying screen and protects the film from exposure to light

rigid, constructed of plastic on the front and metal on the back; permits the passage of the x-ray beam through the front side (tube side)

a device used to reduce the amount of scatter radiation that reaches an extraoral film during exposure

what are the effects of scatter radiation

can be used to decrease film fog and increase the contrast of the radiographic image

to compensate for the lead strips found in the grid, what happens to the exposure time

patient preparation for extraoral radiography(3)

used to examine the posterior region of the mandible and is valuable for use in children, in patients wiht limited jaw opening dut to fracure or swelling, and in patients who have difficulty stabalizing or tolerating intraoral film placement

which is preferred, panoramic radiograph or lateral jaw radiograph? why?

does lateral jaw rediography require the use of a special x-ray unit?

2 techniques used with lateral jaw projection

purpose of the lateral jaw projection-body of the mandible is to evalute (3)

Film placment, head position and x-ray beam point of entry for lateral jaw, body of the mandible and ramus of the mandible

used to examine the bones of the face and skull and is most often used in oral surgery and orthodontics

the most common skull radiographs used in dentistry include the following (5)

Film placement of all five skull radiographs

X-ray beam point of entry for all five skull radiographs

head position for lateral cephalometric

head postion for posteroanterior

head position for waters

head postion for submentovertex

head position for reverse towne

purpose is to evaluate facial growth and development, trauma, and disease and developmental abnormalities

This projection demonstrates the bones of the face and skull as well as the soft tissure profile of the face

the soft tissure outline of the face is more readily seen on the resulting radiograph whe what is used

where does the filter go

what is the purpose of the filter

a line extending from the top of the ear canal to the bottom of the eye socket

purpose is to evaluate facial groth and development, trauma and disease and developmental abnormalities

these projections demonstrates the forntal and ethmoid sinuses, the orbits and the nasl cavity

MSP

Purpose is to evaluate the maxillary sinus area

Purpose is to identify the position of the condyles, semonstrate the base of the skull, adn evaluate fractures of the zygomatic arch

this projection demonstrates the sphenoid and ethmoid sinuses and teh lateral wall of the maxillary sinus

purpose is to idnetify fractures of teh condylar neck and ramus area

What makes up the TMJ