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DEN 107 FINAL (DANB STUDY GUIDE) QUESTIONS AND ANSWERS 2024
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DEN 107 FINAL (DANB STUDY GUIDE)The uses of dental images include the detection of - answer abnormalities in
surrounding hard and soft tissues.
Exposure to radiation - answer no matter how small, has the potential to cause harmful
biological changes.
The x-ray was discovered in 1895 by - answer Wilhelm Conrad Roentgen
The dentist who is credited making the first dental radiograph in 1895 is - answer Otto
Kalkhoff
In dentistry, the __________ the wavelengths of the x-rays, the greater their energy and
their usefulness. - answershorter
The component of the x-ray machine that functions in positioning the tubehead is the -
answerextension arm
The heart of the x-ray generating system is the - answerx-ray tube
Secondary radiation - answerrefers to x-radiation that is created when the primary beam
interacts with matter.
All of the following structures will appear radiolucent on dental x-ray film except -
answermetal restorations
The term ____________ is used to describe areas that appear dark on the image;
___________ is the term used to describe areas that appear white or light gray. -
answerradiolucent; radiopaque
The range of shades of gray between black and white on an image is called -
answercontrast
The degree of density or blackness on an image is controlled by the -
answermilliampere seconds
The sharpness of a radiographic image can be improved by - answersmaller film crystal
size
Damage caused by ionizing x-radiation to genetic cells - answercan affect future
generations
,Which of the following tissues has the highest radiation sensitivity? - answerBone
marrow
A lead apron and a thyroid collar - answermust be used on all patients for all exposures
The Guidelines for Prescribing Dental Radiographs issued by the American Dental
Association and the FDA recommend which of the following dental imaging procedures
for a pregnant patient? - answerRadiographic imaging procedures do not need to be
altered because of pregnancy
One of the rules of radiation protection is never stand closer than ______ feet from the
x-ray unit during an exposure unless you are behind a barrier - answer6
Dental imaging - answerrefers to film-based images
refers to digitally produced images
and detects conditions that might otherwise remain undetected
Which of the following is the name for the primary kind of radiation produced in the
dental x-ray tubehead? - answerBraking radiation
The portion of the x-ray machine that supplies the electrons to produce x-rays is the -
answercathode
What is the purpose of the insulating oil that fills the x-ray machine housing and
surrounds the x-ray tube? - answerAbsorbs heat created by the production of x-rays
Thermionic emission refers to the - answerrelease of electrons from the tungsten
filament
The lead collimator is used to - answerrestrict the size and shape of the primary beam
How much filtration is federally required for a dental x-ray machine operating over 70
kVp - answer2.50 mm
The function of the _________ filter in the x-ray tube is to ____________________ -
answerlead; restrict the size of the beam
Primary radiation is - answerthe beam of x-rays that comes from the target.
The fuzzy or blurred area around an image is called _____________. It can be reduced
by _______________. - answera penumbra; limiting movement
Because the entire x-ray area is considered a radiation hazard area, a radiation hazard
sign must be posted in - answersight of patients
and sight of personnel
, The time lapse from x-ray exposure until noticeable damage occurs is known as -
answerthe latent period
Chronic radiation exposure occurs when _____ doses of radiation are received over a
_______ time period. - answersmall; long
Which of the following terms is used to describe the energy or penetrating ability of the
x-ray beam in dental radiography? - answerQuality
All the following organs are more sensitive to radiation and are considered critical
organs except - answermuscle
The maximum permissible dose for an occupational worker for an individual 18 years of
age or older is _____ rem/year. - answer5
Who should hold the film in a patient's mouth if the patient is unable to do so? -
answerParent or relative of the patient
A patient is concerned with radiation exposure. You can assure him that your office
uses the ALARA concept, which includes - answerreducing the number of exposures
minimizing retakes
and keeping exposures levels as low as possible
One of the earliest signs of overexposure to x-rays may be - answererythema
If the operator's film badge indicates an exposure to small amounts of radiation, what
should be done? - answerEvaluate the x-ray equipment and techniques
An example of cumulative radiation exposure is - answercataracts
leukemia
and cancer
The dentist says that the image has too much contrast; she would like to see more gray
values. What adjustment would you make? - answerIncrease kVp
How well the image reproduces fine detail or distinct outlines of an object is called -
answersharpness
The location where x-rays are produced in the x-ray tube is called the - answerfocal
spot
When the electrons strike the target, ____________________ are generated. -
answer99% heat and 1% x-rays
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