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DENTAL RADIOLOGY (BOARD REVIEW) ACTUAL QUESTIONS AND ANSWERS 100% CORRECT | NEW UPDATE
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DENTAL RADIOLOGY (BOARD REVIEW) ACTUAL QUESTIONS AND ANSWERS 100% CORRECT | NEW UPDATE
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DENTAL RADIOLOGY (BOARD REVIEW)ACTUAL QUESTIONS AND ANSWERS 100%
CORRECT | NEW UPDATE 2024-2025
Which radiology innovator is known as the father of the science of radiation
protection? - ANSWER Willhelm Roentgen
What is the source of electrons used for x-ray production? - ANSWER Tungsten
filament
Where does the generation of xrays in the xray tube actually occur? - ANSWER
Tungsten target
Which theory best describes the free radical formation that is so injurious to living
tissue? - ANSWER Indirect theory
What unit of radiation represents the amount of radiation energy absorbed by the
tissue? - ANSWER Gray
What factor is most important when considering the biologic effects of radiation
used in dentistry? - ANSWER Limited area exposure
Which cell type is the most sensitive to radiation? - ANSWER Immature cells
What reduces operator exposure to radiation? - ANSWER Distance
,Which radiographic technique has less distortion and magnification and creates a
more accurate image on film? - ANSWER Paralleling
What is used to restrict the size of the xray beam? - ANSWER Collimation
If the source-to-film distance is changed from 8 to 24 inches, the intensity of the
beam becomes __________. - ANSWER 1/9th as intense
The greatest cause of human radiation effects in dental radiography involve
_________. - ANSWER Free radicals of water
Cell sensitivity to radiation is most pronounced when? - ANSWER During
mitosis, periods of increased metabolism and during embryonic development
How many impulses equal a 1/4 second exposure time? - ANSWER 15
As you go from a "D-speed" film to an "E-speed" film, the exposure time should be
approximately ________. - ANSWER Halved
The mA setting controls what? - ANSWER Heat of the tube filament
Number of free electrons in the tube
number of photons ultimately produced
The density of the film
, A bite wing film is exposed properly using an exposure setting of 1 second with
the xray source 8 in from the patient. What time would be needed if the source
was moved 16 inches away? - ANSWER 4 seconds
For optimal detection of incipient interproximal caries, what machine setting is
preferable? - ANSWER 65 Kvp, 10 mA
What controls the quality of the xray beam and thus film contrast? - ANSWER
Aluminum filtration
kVp
Increasing the kVp results in :___________. - ANSWER A long scale of contrast
The primary purpose of sodium thiosulfate is to ________. - ANSWER Remove
the silver bromide crystals that have not been developed and enhance contrast
Films not fixed for a long enough period of time will appear ___. - ANSWER To
have a brown tint
For reducing scatter radiation, the collimation or restriction of the radiation beam
at the patient's face should not exceed ___________. - ANSWER 2.75 inches
The most radiation sensitive tissue is _________. - ANSWER Hematopoietic
(Blood)
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