WorksheetsDental Radiology Midterm
Total questions: 50
Worksheet time: 25mins
Wilhelm Conrad Roentgen discovered _______ in 1895
extraoral
x-rays
intraoral
None of the Above
The colored light was later discovered to be a stream of electrons that traveled from
electrons
atoms
cathode
anode
This is at the end of tube that directs the flow of x-ray, made of tungsten target.
cathode
anode
neutrons
atoms
Dr. C. Edmond Kells, a New Orleans dentist, took the first
Intraoral
Pano
Cephalometric
Periapical
What is the open-ended part of tube called
Position indicator device (PID) or cone
extraoral
intraoral
I don't know
The most familiar forms of electromagnetic energy are
Car battery and engine
moon, stars and venus
radio and television waves and visible light.
I don't know
_________________is the process by which atoms change into negatively or positively charged ions during radiation.
Ionization
Milliamperage
Kilovoltage
Impulse
_____________radiation is the central beam that comes from the x-ray tubehead.
Primary
Leakage
Secondary
Scatter
_________radiation forms when the primary x-ray strikes or contacts any type of matter (solid, liquid, gas)
Secondary
Leakage
Primary
Scatter
___________radiation deflects from its path as it strikes matter.
Scatter
Primary
Leakage
Secondary
______________radiation is a form of radiation that escapes in all directions from the tube or tubehead.
Secondary
Primary
Leakage
Scatter
Circuit boards and control are located in the ________________ of the dental x-ray unit.
control panel
kilovoltage
electronic timer
milliamperage
The most common settings for the kilovoltage is (are)
60 to 90
70 to 90
10 to 15
80 to 90
The most common settings for the milliamperage are
10 to 20
10 to 25
10 to 15
10 to 30
During the __________________ process, current passes through the cathode filament and heats it to an extremely high temperature.
bisecting technique
cross-section technique
thermionic emission
blurred image
Electromagnetic radiation with short wavelengths with high frequency equals _________________ energy.
less
more
kinetic
magnetic
The orthopantomograph unit took the first acceptable _____________________ radiographs.
panoramic
PID
intraoral
None of the Above
The period between the exposure and development of biological effects is called the ___________________ period.
RBE
latent
sievert
radiosensitive
__________________ is the degree of darkness on an x-ray.
Density
Opacity
Contrast
Obscureness
Long bite-wing film
No. 0
No. 1
No. 3
No. 2
Adult films are
No. 2
No. 3
No. 1
No. 0
Occlusal film is
No. 4
No. 2
No. 1
No. 0
Narrow anterior film uses
No. 4
No. 1
No. 2
No. 3
Which intraoral technique for film exposures do the American Association of Dental School and the American Academy of Oral and Maxillofacial Radiology recommend?
Paralleling
Horizontal
Bisecting
Occlusal
The ________ radiograph pictures the entire tooth and surrounding area.
occlusal
periapical
bite-wing
edentulous
What teeth requires the usage of the yellow rinn instrument?
PA Premolars and Molars
PA Central Incisors
PA Canine and Lateral incisiors
None of the Above
What teeth require the usage of the blue rinn instrument?
PA Premolars and molars
PA Central Incisors and Molars
PA Central Incisors, lateral Incisors and Canine
PA Premolars
For patients who have a sensitive gags reflex, which of the following may help prevent gagging/
Work quickly while talking to the patient.
Try to persuade the patient to breathe.
Try to get the patient to think of something else.
All of the above.
Head reclines against cassette
Cephalometric
Panoramic
Transcranial Temporomandibular joint
I don't know Mrs. Brown
Patient may sit or stand during this x-ray.
Panoramic
Cephalometric
Transcranial temporomandibular joint
I don't know Mrs. Brown
Patients holds cassette to side of head.
Transcranial temporomandibular joint
Panoramic
Cephalometric
I don't know Mrs. Brown
What imaging technique is mainly used to diagnose TMJ disease?
Magnetic resonance imaging
Ultrasonography
Panoramic
Computed tomography
What is the dental x-ray image that shows the top and bottom teeth.
Bitewing
Occlusal
Periapical
Occlusal
What teeth require the usage of the red rinn instrument?
Bitewing premolar and molars
PA premolar and molars
Occlusal Maxillary and Mandible
None of the Above
_______ cells are radiosensitive cells and rapidly divide.
Basal
Anode
Cathode
None of the Above
Cells that can be affected by radiation are
somatic
genetic
both
None of the Above
Some cells are more radiosensitive than others. Identify the most sensitive tissues and organs.
Lymphoid,Reproductive cells,Intestinal epithelium, Bone marrow
salivary glands,kidney, and muscle
Nerves
None of the Above
Solid metal, made of aluminum.
Anode
Cathode
Filter
None of the Above
The Lead plate
Collimator
Cathode
Anode
None of the Above
The Hard X-rays with short wavelengths is a
Cathode
Anode
Central beam
None of the Above
Why is it important to use dental x-rays safely?
To protect the patients
Safe use minimizes the risk of unnecessary exposure to patients and staff.
To protect the staff to small amounts of ionizing radiation.
None of the Above
What is ALARA, and how is it applied in Dental radiography?
ALARA-As Low As Reasonably Achievable. It ensures radiation exposure is minimized while still obtaining diagnostic images.
ALARA-As Long As Reasonably Activate-Radiation used when taking x-rays
ALARA-As Low As Reasonably Achievable. when x-rays are not taken.
None of the Above
What protective equipment should be used during dental X-rays?
gloves, mask and x-ray machine
Lead apron with thyroid collar, Lead gloves and Proper barriers or distance for staff.
Lead apron, goggles, mask and gloves.
None of the Above
How can a dental assistant minimize radiation exposure to themselves?
Stand at least 6 inches away from x-ray source, behind a lead barrier and use dosimeters.
Stand 6 feet away from x-ray source, behind lead barrier and use dosimeters,
Stand 6 seconds away from x-ray source, behind lead barrier and use dosimeters.
None of the Above
How often should dental X-rays be taken?
Only when clinically necessary.
To use up the patients insurance.
When the patient wants you to take them.
None of the Above
What is the proper technique to avoid retakes of X-rays?
paralleling technique
Perpendicular technique
Proper positioning, correct sensor, and proper exposure settings.
None of the Above.
What types of dental X-rays expose patients to the least radiation?
Digital and Bitewing X-rays
Periapical X-rays
Panoramic
None of the Above.
Why are thyroid collars important for patients?
It's something to wear.
Thyroid glands are highly sensitive to radiation.
Thyroid glands are least sensitive.
None of the Above.
What is tooth # 17 ?
Maxillary left third molar
Mandibular left third molar
Maxillary right third molar
None of the above.
How do dental assistants ensure compliance with X-ray safety regulations?
State and federal guidelines.radiation safety training, inspected equipment and exposure records.
Dental office guidelines, operating training, and old equipment.
Dental School guidelines.
None of the Above.
