Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
55 Cards in this Set
- Front
- Back
Radiographs should be made of injured teeth because
|
the full extent of the injury may not be otherwise apparent
|
|
Elongation of the teeth in an x-ray film results from the
|
veritical angle being too low
|
|
If the target film distance is increased
|
the exposure time is also increased
|
|
substances penetrated by x-rays include
|
tissue and bone
|
|
If the cone does not cover the film, the result on the radiograph will be
|
a partial image
|
|
x-rays of _______ wavelenghts are most efficent in producing dental radiographs
|
short
|
|
The pebbly side of the film is positioned
|
toward the x-ray beam
|
|
The required thickness of aluminum filters for machines operating above 75 kVp is
|
2.5 millimeters
|
|
Film requiring an intensifying screen are
|
extraoral films
|
|
THe tissue which appears as a fine white line on the edge of bone around the root of the tooth in an x-ray is called
|
lamina dura
|
|
Material that apears the most opaque in a dental radiograph is
|
amalgam
|
|
A radiolucent substance will produce a _________ image on the processed film
|
dark
|
|
The ______ energy rays cause unnecessary radiation to tissue and result in poor radiographs
|
lower
|
|
Dental radiographs are the property of the
|
dentist exposing the radiograph
|
|
The type of x-ray film used to examine the apex of a tooth is
|
periapical
|
|
Radiographs that show only the crowns of the teeth are
|
interproximal
|
|
Blurred radiographs may result from
|
movement during exposure
|
|
The cephalometric tracing is used for each of the following except
|
planning for restorative procedures
|
|
The body structures most sensitive to ionizing radiation is
|
reproductive organs
|
|
The cells of the body least suscepectible to radiation x-rays are
|
muscle cells
|
|
What is the purpose of fixing solution
|
removing the unexposed crystals that were unaffected by the developer solutions
|
|
The main ingredient in the developer is
|
water
|
|
THe fixing solution is
|
acidic
|
|
The acetic does what
|
preserves the fixer
|
|
A ________ will appear on an x-ray film if it was not washed long enough
|
yellow-brown stain
|
|
If films are not fixed for correct amount of time they will appear to have a _____
|
brown tint
|
|
The ideal temp for the developing solution is _________ max
|
70 degrees/75 degrees
|
|
What is the gelatin suspension of silver halide salts called on an x-ray film?
|
emulsion
|
|
What are the uses of the lead foil in an x-ray packet?
|
stops unused radiation
prevents film fog |
|
What is the x-ray tube housing made up of?
|
glass
|
|
As the target film distance is increased, there is
|
less distortion
|
|
X-rays are made of
|
photons
|
|
Is the penetrating power of x-rays the KVP or the MA?
|
KVP
|
|
Why must we have proper collimation
|
reduce radiation to the patient 2 3/4
|
|
What does the milliamperage control?
|
controls the amount of radiation
|
|
The cathode has a filament and it is composed of what material?
|
tungsten
|
|
The thickness of the lead diaphragm is
|
1/16th of an inch
|
|
The lead apron contains how many millimeters of lead?
|
0.25mm
|
|
What is the theory for the paralleling technique?
|
The central rays are directed perepndicular to the film which is parallel to the long axis of the tooth
|
|
What is the bisecting angle technique?
|
ceontral rays must be projected perpendicularly to a plane bisecting angle formed by the longitudinal axis of the tooth and plane of the film packet
|
|
When is the ala-tragus line parallel to the floor?
|
max periapical
interproximal max occlusal |
|
If a patient gags easily, teh dental assistant should...
|
do anterior teeth first
have the patient hold their breath have patient rinse with mouth wash |
|
The logical sequence for taking a full mouth set of x-rays is
|
upper arch, bite wings, lower arch
|
|
Occlusal films are used to determine
|
buccolingual orientation of a tooth (cheek to tongue)
|
|
The maximum whole body dose per week for those who work with radiation is
|
.3 rems
|
|
Extra oral films are _____ than intra oral films.
|
more sensitive
|
|
The speed of the dental film is determined by the amount _________
|
amount of x-rays needed
|
|
If the MA is increased while the KVP and exposure time is the same, the films will appear ______
|
darker
|
|
Scatter radiation is a form of _______
|
secondary radiation
|
|
What causes film fog?
|
Light leak in the darkroom
|
|
Cephalometric x-rays are used in ____
|
orthodontics
|
|
If the target-film distance is increased, the ___________
|
exposure time is also increased
|
|
For minimal exposure to the patient,
|
group E film is used.
|
|
The temperature of the processing solution is adjusted by a ________
|
water bath
|
|
The occlusal plane of the arch should be _________
|
parallel to the floor
|