Iowa Dental Assistant Registration:
Radiology Practice Exam With 100%
Solved Solutions (2025-2026) Update.
What two agencies oversee dental radiography? What is the function of each with respect to
dental radiography? - Answer Iowa Department of Public Health: state radiation control
agency, inspects facilities; Iowa Dental Board: ensures that dental assistants meet minimum
training standards; issues qualification in dental radiography
Under what conditions can a dental assistant take radiographs? - Answer Assistant must have
added qualified in dental radiography or be on trainee status Dentist must order the films
Dentist must provide supervision
Under what conditions can a dental assistant trainee take radiographs? - Answer Dentist must
order the films. Dentist must provide personal supervision of trainee
What three things are required to obtain radiography qualification from the Board? - Answer
Course of study that includes clinical training, examination, and an application with fee
When is the radiography qualification renewed? What are the renewal requirements? - Answer
Renewed when registration is renewed - by August 31 of odd-numbered years
What are the renewal requirements for dental radiography? - Answer Renewal requires proof
of 2 hours of continuing education in dental radiography and renewal fee
Name two possible penalties for violating dental radiography requirements. - Answer
Disciplinary action by the dental board Criminal charges or civil action
T/F: A dentist should always prescribe radiographs every six months to review a patient's dental
condition. - Answer False
T/F: A certified dental assistant does not need to obtain a separate radiography qualification
from the Board to take x-rays. - Answer False
T/F: Dental assistant trainees can train in dental radiography during the trainee period. - Answer
, What are the parts of the control panel? What is the function of each part? - Answer Timer:
controls how long electrons move—length of exposure mA setting: determines the number of
electrons available kVp setting: determines the force of electron movement
A source of electrons is needed to create x-rays. What else is needed to create x- rays? - Answer
Motion to the electrons Something to stop the electrons
What determines the number of electrons that will be used? - Answer mA and time
What role does kinetic energy play in the creation of x-rays? - Answer Electrons in motion
possess kinetic energy; Kinetic energy from electrons in motion is converted into heat and x-rays
when the electrons are stopped
What does the force of electron movement have to do with the x-rays that are created - Answer
Force of movement determines force of x-ray The greater the movement force, the more
powerful the x-rays
Which x-ray has more penetrating power, one that was created with a kVp of 60 or an x-ray that
was created with a kVp of 80? - Answer 80 kVp
What is the function of the PID? - Answer Aim the central rays - used to aim the x-rays
If the patient moves during the exposure, which film quality is affected? - Answer Detail, aka
definition
What should you do to lighten a film's density? - Answer Decrease the mA or decrease time
If the dentist looks at some films and tells you she wants more shades on the next film, what
would you adjust? - Answer Increase the kVp to increase the number of shades (high kVp
yields long scale contrast)
Name four factors of a diagnostically acceptable radiograph. - Answer Proper density, contrast
and detail; shows entire area and surrounding structures
Where would you look to find the collimator? - Answer Base of the PID
Radiology Practice Exam With 100%
Solved Solutions (2025-2026) Update.
What two agencies oversee dental radiography? What is the function of each with respect to
dental radiography? - Answer Iowa Department of Public Health: state radiation control
agency, inspects facilities; Iowa Dental Board: ensures that dental assistants meet minimum
training standards; issues qualification in dental radiography
Under what conditions can a dental assistant take radiographs? - Answer Assistant must have
added qualified in dental radiography or be on trainee status Dentist must order the films
Dentist must provide supervision
Under what conditions can a dental assistant trainee take radiographs? - Answer Dentist must
order the films. Dentist must provide personal supervision of trainee
What three things are required to obtain radiography qualification from the Board? - Answer
Course of study that includes clinical training, examination, and an application with fee
When is the radiography qualification renewed? What are the renewal requirements? - Answer
Renewed when registration is renewed - by August 31 of odd-numbered years
What are the renewal requirements for dental radiography? - Answer Renewal requires proof
of 2 hours of continuing education in dental radiography and renewal fee
Name two possible penalties for violating dental radiography requirements. - Answer
Disciplinary action by the dental board Criminal charges or civil action
T/F: A dentist should always prescribe radiographs every six months to review a patient's dental
condition. - Answer False
T/F: A certified dental assistant does not need to obtain a separate radiography qualification
from the Board to take x-rays. - Answer False
T/F: Dental assistant trainees can train in dental radiography during the trainee period. - Answer
, What are the parts of the control panel? What is the function of each part? - Answer Timer:
controls how long electrons move—length of exposure mA setting: determines the number of
electrons available kVp setting: determines the force of electron movement
A source of electrons is needed to create x-rays. What else is needed to create x- rays? - Answer
Motion to the electrons Something to stop the electrons
What determines the number of electrons that will be used? - Answer mA and time
What role does kinetic energy play in the creation of x-rays? - Answer Electrons in motion
possess kinetic energy; Kinetic energy from electrons in motion is converted into heat and x-rays
when the electrons are stopped
What does the force of electron movement have to do with the x-rays that are created - Answer
Force of movement determines force of x-ray The greater the movement force, the more
powerful the x-rays
Which x-ray has more penetrating power, one that was created with a kVp of 60 or an x-ray that
was created with a kVp of 80? - Answer 80 kVp
What is the function of the PID? - Answer Aim the central rays - used to aim the x-rays
If the patient moves during the exposure, which film quality is affected? - Answer Detail, aka
definition
What should you do to lighten a film's density? - Answer Decrease the mA or decrease time
If the dentist looks at some films and tells you she wants more shades on the next film, what
would you adjust? - Answer Increase the kVp to increase the number of shades (high kVp
yields long scale contrast)
Name four factors of a diagnostically acceptable radiograph. - Answer Proper density, contrast
and detail; shows entire area and surrounding structures
Where would you look to find the collimator? - Answer Base of the PID
