|DANB RADIOLOGY EXAM| 249 QUESTIONS AND ANSWERS 2025
(100% CORRECT)
3 film holding devices used for bisecting - (Answer)dentsply rinn stabe, rinn BAI, dental
SUPA
3 film holding devices used for paralleling - (Answer)dentsply rinn XCP-DS, Rinn XCP,
flow dental RAPD
a patient complains of pain in the upper molar region. What radiographic exposure
should be made? - (Answer)periapical
a properly exposed film appears completely black. when was it exposed to white light? -
(Answer)before it was processed
According to the principles of shadow casting, preferred object, film distances -
(Answer)As close as possible to
According to principles of shadow casting, how should the central beam be directed? -
(Answer)Perpendicular to the tooth and film
According to the principles of shadow casting, how should the film be placed in relation
to the tooth? - (Answer)parallel
According to principles of shadow casting what is the preferred source object distance?
- (Answer)As far as practical
After processing exposed dental film, you noticed dark spots on the film. What caused
this? - (Answer)Premature contact with the developer
An insurance company request a patient's radiographs when examining a dental claim
you only have one copy of the radiographs. what should you duplicate and which should
go to the insurance company? - (Answer)Duplicate, which will go to the insurance
company.
The office keeps the best copy
Desired thickness of lead apron - (Answer).25 mm
Difference between direct and indirect exposure sensor - (Answer)-Direct means
directly obtaining a digital image by exposing intraoral sensor to x-rays to provide an
image that can be viewed on a computer.
-indirect is photostimuble phosphor plate sensor technology, obtaining a digital image in
which an exposed phosphor plate is placed into a scanner and then converted into a
digital image.
Explain PSP - (Answer)-Photostimuable Phosphor Plate aka storage phosphor system
-indirect digital imaging
,-captures analog data then processed in a laser scanning device
-light is then converted into electrical signal that the computer uses to create the digital
image
Films submerged, totally in fixer but not in developer. What will it look like? -
(Answer)The part that was fixed, but not developer would be clear
How are indirect exposure films exposed - (Answer)X-rays hit phosphor screen creating
fluorescent light that exposes the film
How are stable film holders cleaned between use - (Answer)Sterilize film holder devices
or discard disposable image receptor holding devices
How are x-rays formed in the tube head - (Answer)Turn on the machine, adjust settings,
press exposure button, filament heats up/ thermionic emission, electron cloud is formed,
electrons flow from cathode to anode, electrons strike target, energy is converted into x-
rays and heat
How can exposure to the operator be reduced? - (Answer)move farther from the
radiation
How can you differentiate the zygoma from the maxillary sinus in a maxillary posterior
PA? - (Answer)- The maxillary sinus appears as three sided pyramid
- The zygoma appears a J-shaped
How do you determine how often to take radiographs - (Answer)evidence based
selection criteria
How do you differentiate between maxillary and mandibular molars when mounting? -
(Answer)- you differentiate them by how many roots are in the molars
- Maxillary have roots and mandibular have two roots
How does exposure time differ between adults and children? - (Answer)The exposure
time is cut by 1/3
How does exposure time for children compare to that of an adult - (Answer)1/3-1/2
How does exposure time for edentulous patients compare to dentulous patients? -
(Answer)1/5 exposure time for edentulous
How does film speed correlate with definition and detail? - (Answer)faster film = lower
definition and detail
How does kVp affect patient exposure - (Answer)Higher kVp= low pressure
, How does packet placement differ between bisecting and paralleling? - (Answer)-
bisecting - packet is as close to tooth as possible, but not parallel
-parallel - packet is parallel to tooth, further away
How does radiation affect cells? - (Answer)It causes damage to living cells. Ionization.
How does reducing exposure to the patient benefit the operator? - (Answer)The less the
patient is exposed, the less the operator is exposed
How does resolution and detail of a panoramic radiograph compare with that of a PA
and BW? - (Answer)It is not as sharp and detailed as the intra oral image
How does the reproductive capacity of a cell correlate with radio sensitivity? -
(Answer)Rapidly producing cells are more sensitive to radiation
How far from the work surface must the Safelite be mounted? - (Answer)4 feet
How far should the operator stand from the source of radiation - (Answer)6 feet
How is vertical angulation established with the bisecting technique? - (Answer)beam is
perpendicular to the imaginary line that bisects the angle formed by the long axis and
the film
How is vertical angulation established with the paralleling technique? - (Answer)It is
perpendicular to the film, and parallel to the bite portion of the stabe
How long are films fixed? Assume optimal temperature - (Answer)10 minutes
How long does films stay in the developer assume optimal temperature - (Answer)Five
minutes, 68°F
How long does the wash last? - (Answer)10 to 15 seconds
How long is the final rinse? - (Answer)20 min
How many impulses are in .25 seconds - (Answer)15 impulses
How much total filtration is required of x-ray machines that operate lower than 70 KVP -
(Answer)1.5 mm
How often are BMWs taken on children with high-risk? - (Answer)Every six months
How often must you replenish the solutions in an automatic processor? How often
should you check for replenishment? - (Answer)For every 30 films processed 6-8 oz
should be taken out and replaced with fresh solution
(100% CORRECT)
3 film holding devices used for bisecting - (Answer)dentsply rinn stabe, rinn BAI, dental
SUPA
3 film holding devices used for paralleling - (Answer)dentsply rinn XCP-DS, Rinn XCP,
flow dental RAPD
a patient complains of pain in the upper molar region. What radiographic exposure
should be made? - (Answer)periapical
a properly exposed film appears completely black. when was it exposed to white light? -
(Answer)before it was processed
According to the principles of shadow casting, preferred object, film distances -
(Answer)As close as possible to
According to principles of shadow casting, how should the central beam be directed? -
(Answer)Perpendicular to the tooth and film
According to the principles of shadow casting, how should the film be placed in relation
to the tooth? - (Answer)parallel
According to principles of shadow casting what is the preferred source object distance?
- (Answer)As far as practical
After processing exposed dental film, you noticed dark spots on the film. What caused
this? - (Answer)Premature contact with the developer
An insurance company request a patient's radiographs when examining a dental claim
you only have one copy of the radiographs. what should you duplicate and which should
go to the insurance company? - (Answer)Duplicate, which will go to the insurance
company.
The office keeps the best copy
Desired thickness of lead apron - (Answer).25 mm
Difference between direct and indirect exposure sensor - (Answer)-Direct means
directly obtaining a digital image by exposing intraoral sensor to x-rays to provide an
image that can be viewed on a computer.
-indirect is photostimuble phosphor plate sensor technology, obtaining a digital image in
which an exposed phosphor plate is placed into a scanner and then converted into a
digital image.
Explain PSP - (Answer)-Photostimuable Phosphor Plate aka storage phosphor system
-indirect digital imaging
,-captures analog data then processed in a laser scanning device
-light is then converted into electrical signal that the computer uses to create the digital
image
Films submerged, totally in fixer but not in developer. What will it look like? -
(Answer)The part that was fixed, but not developer would be clear
How are indirect exposure films exposed - (Answer)X-rays hit phosphor screen creating
fluorescent light that exposes the film
How are stable film holders cleaned between use - (Answer)Sterilize film holder devices
or discard disposable image receptor holding devices
How are x-rays formed in the tube head - (Answer)Turn on the machine, adjust settings,
press exposure button, filament heats up/ thermionic emission, electron cloud is formed,
electrons flow from cathode to anode, electrons strike target, energy is converted into x-
rays and heat
How can exposure to the operator be reduced? - (Answer)move farther from the
radiation
How can you differentiate the zygoma from the maxillary sinus in a maxillary posterior
PA? - (Answer)- The maxillary sinus appears as three sided pyramid
- The zygoma appears a J-shaped
How do you determine how often to take radiographs - (Answer)evidence based
selection criteria
How do you differentiate between maxillary and mandibular molars when mounting? -
(Answer)- you differentiate them by how many roots are in the molars
- Maxillary have roots and mandibular have two roots
How does exposure time differ between adults and children? - (Answer)The exposure
time is cut by 1/3
How does exposure time for children compare to that of an adult - (Answer)1/3-1/2
How does exposure time for edentulous patients compare to dentulous patients? -
(Answer)1/5 exposure time for edentulous
How does film speed correlate with definition and detail? - (Answer)faster film = lower
definition and detail
How does kVp affect patient exposure - (Answer)Higher kVp= low pressure
, How does packet placement differ between bisecting and paralleling? - (Answer)-
bisecting - packet is as close to tooth as possible, but not parallel
-parallel - packet is parallel to tooth, further away
How does radiation affect cells? - (Answer)It causes damage to living cells. Ionization.
How does reducing exposure to the patient benefit the operator? - (Answer)The less the
patient is exposed, the less the operator is exposed
How does resolution and detail of a panoramic radiograph compare with that of a PA
and BW? - (Answer)It is not as sharp and detailed as the intra oral image
How does the reproductive capacity of a cell correlate with radio sensitivity? -
(Answer)Rapidly producing cells are more sensitive to radiation
How far from the work surface must the Safelite be mounted? - (Answer)4 feet
How far should the operator stand from the source of radiation - (Answer)6 feet
How is vertical angulation established with the bisecting technique? - (Answer)beam is
perpendicular to the imaginary line that bisects the angle formed by the long axis and
the film
How is vertical angulation established with the paralleling technique? - (Answer)It is
perpendicular to the film, and parallel to the bite portion of the stabe
How long are films fixed? Assume optimal temperature - (Answer)10 minutes
How long does films stay in the developer assume optimal temperature - (Answer)Five
minutes, 68°F
How long does the wash last? - (Answer)10 to 15 seconds
How long is the final rinse? - (Answer)20 min
How many impulses are in .25 seconds - (Answer)15 impulses
How much total filtration is required of x-ray machines that operate lower than 70 KVP -
(Answer)1.5 mm
How often are BMWs taken on children with high-risk? - (Answer)Every six months
How often must you replenish the solutions in an automatic processor? How often
should you check for replenishment? - (Answer)For every 30 films processed 6-8 oz
should be taken out and replaced with fresh solution
