Chapter 7 : Dental X-ray Film Flashcards
Types of X-ray film
Intra oral film
extra oral film
occlusal film
An intraoral x-ray film packet is made up of four separate items:
Xray film
paper film wrapper
lead foil sheet
Outer film wrapping
protective sheet that covers the film and shields the film from light.
Paper film wrapper
thin, transparent coating placed over the emulsion.
Protective layer
is a flexible piece of polyester plastic 0.2 mm (200 microns) in thickness that is constructed to withstand heat, moisture, and chemical exposure
Film Base
Thin layer of adhesive material that covers both side of the film base
Adhesive Layer
a coating attached to both sides of the film base by the adhesive layer to give the film greater sensitivity to x-radiation.
film emulsion
A chemical compound that is sensitive to radiation or light
Halide
used to suspend and evenly disperse millions of microscopic silver halide crystals over the film base.
gelatin
stored energy on the film that cannot be seen until processed
latent image formation
The purpose of intra oral film packaging
to protect it from light and moisture
Double emulsion film
x-ray
why is a double emulsion film useful
requires less radiation exposure to produce an image
The raised bump is used to determine film orientation
also determines left and right side of the patient
identification dot
shields the film from backscatter (secondary radiation)
Lead foil sheet
a soft-vinyl or paper wrapper that hermetically seals the film packet, protective paper, and lead foil sheet.
outer package wrapping
purpose of outer package wrapping
protects film from exposure to oral fluids and light
solid white and has a raised bump in one corner that corresponds to the identification dot on the x-ray film.
tube side
has a flap used to open the film packet and remove the film before processing. Side that has colour
label side
three types of intraoral film types
periapical
bite wing
occlusal
used to examine the entire tooth (crown and root) and supporting bone
periapical film
used to examine the crowns of both maxillary and mandibular teeth on one film
bite wing
Which film is particularly useful in examining interproximal, or adjacent, tooth surfaces?
bite wing
used for examination of large areas of the maxilla or the mandible
occlusal film
Sizes of periapeical film
0,1,2
0: used for small childen
1: Examines anterior teeth in adults
2: Examines anterior and posterior teeth in adults
the “standard film” size in periapical film
size 2
Sizes of bitewing film
0,2,3
0: posterior teeth; small children
2;posterior teeth in OLDER children AND Adults
3: Shows all posterior teeth on one side of the radiograph
the largest intraoral film and is almost four times as large as a standard size 2 periapical film.
Occlusal film
amount of radiation required to produce a radiograph of standard density is called
Film speed
reccomended speed film
F speed
film
this film results in less radiation exposure of the patient and provides stable contrast characteristics.
F speed film
shows a panoramic (wide) view of the maxilla and the mandible and surrounding structures on a single image
panoramic image
exhibits the bony and soft tissue areas of the facial profile
cephalometric image
sizes of extraoral film used in dentral radiography in inches
5x7 inch and 8x10 inch
Two types of film in extraoral radiography
screen film
non screen film
a film that requires the use of a screen for exposure
screen film
where is the screen film placed
between two intensifying screens in a cassette
this film is sensitive to flourescent light rather than ro direct exposure to radiation
screen film
an extraoral film that does not require the use of screens for exposure.
Non-screen film
this film is not reccommended for use in the dental office because it requires more radiation
Non- screen film
Two items in extra oral film equipment
intensifying screen
cassette
sandwiched between two intensifying screens of matching size and is secured in a cassette
screen film
what color(s)does phosphors flourescence emit ?
blue or green
what colour does that Conventional calcium tungstate emit
blue light
colour that rare earth screens emit
green
a special device that is used to hold the extraoral film and the intensifying screens
cassette
lack of contact between screen and film results in _______
loss of image sharpness
a type of photographic film used to make an identical copy of an intraoral or extraoral radiograph.
duplicating film
how many sides does a duplicating film have ?
one
The optimum temperature for film storage
50-70F
optimum relative humidity level
30-50%
