DAS 130 FINAL EXAM QUESTIONS SOLVED CORRECTLY LATEST UPDATE 2025 ALREADY PASSED
X-rays were discovered by: - Answers Wilhelm Roentgen
Which of the following was Otto Walkhoff's contribution to dental radiography? - Answers He made the
first dental radiograph.
Which of the following was the most recent development in the history of dental x-ray equipment? -
Answers Introduction of a recessed long-beam tubehead.
Current, fast film requires less than __% of the initial exposure times used for dental radiography in
1920. - Answers 2
The long-cone paralleling technique was introduced by ______________ in 1947. - Answers F. Gordon
Fitzgerald
Cassandra is a college sophomore visiting your dental office for an initial examination. Her dental history
reveals that her dental care has been infrequent throughout her childhood and young adulthood, and
no care in the past 18 months. Any previous dental radiographs would be long outdated. When
Cassandra is informed of the rationale and need for a current full-mouth series, she states that she read
on the Internet that dental x-rays are unnecessary and would expose her to needless, dangerous
radiation.
You explain to Cassandra that: - Answers radiographs enable the dental professional to identify many
conditions that may otherwise go undetected and to see conditions that cannot be identified clinically.
Which of the following is true regarding the component parts of an intraoral dental x-ray machine? -
Answers The position-indicating device (PID) extends from the tubehead opening.
The exposure light turns ________ and the beep ______ when the x-ray exposure is completed. -
Answers off; stops
Beam alignment devices and collimating devices are used to indicate the position of the _______ in
relation to the tooth and the receptor? - Answers position-indicating device (PID)
__________ is a device used to hold and align intraoral dental x-ray films in the mouth. - Answers film
holder
After exposing a few radiographic images, a few of the images appear light. You know that the exposure
times were set properly, and a quick check reveals the films have not been placed backward and the
processing chemistry are up to date. A possible solution could be: - Answers make sure to hold the
exposure button down until the end of the beeping sound.
Prior to ___________, no federal standards existed for the manufacturer of dental x-ray machines. -
Answers 1974
,The film emulsion is composed of a homogenous mixture of - Answers gelatin and silver halide crystals
___________ is the main component of the silver halide crystals in dental x-ray film. - Answers Bromide
The latent image is stored by the ______________ in dental x-ray film. - Answers silver halide crystals
The invisible pattern of stored energy on the exposed film is called the - Answers latent image
When would you use a two-film packet when taking radiographs on your patient? - Answers When a
duplicate record of a radiographic examination is needed.
What is the purpose of the lead foil sheet found within the film packet? - Answers To shield the film
from secondary backscattered radiation
When you are placing the film packet in your patient's mouth, which side of the film packet would you
place toward the patient's teeth? - Answers The solid white side
Your dentist asks you to take radiographs on your patient in order to check the interproximal surfaces of
the posterior maxillary and mandibular teeth for decay. Which type of film would be the best to take the
radiograph? - Answers Bite-wing film
Your dentist asks you to take radiographs on your patient in order to check the apex (tip) of the
mandibular left posterior teeth. Which type of film would be the best to take the radiograph? - Answers
Periapical
The size #2 dental x-ray film may be used for which types of radiographs? - Answers - Adult periapical
- Adult bitewing
- Occlusal for a 6 year old pediatric patient.
Which of the following film speed is the fastest film currently available? - Answers F-speed film
An intensifying screen is a smooth plastic sheet coated with minute fluorescent crystals known as -
Answers phosphors
Rare earth screens - Answers have phosphors that emit green light
Duplicating film - Answers is used to make an identical copy of an intraoral or extraoral radiograph
Film is best stored in an area that is - Answers cool and dry
An oral examination limits the practitioner to knowledge of what is seen clinically. Dental images allow
the practitioner to see many conditions that are not apparent clinically - Answers Both statements are
true.
Through the use of dental images, the dental radiographer can detect ________ that cannot be detected
clinically. - Answers - diseases
, - lesions
- lesions
When dental images are properly prescribed, exposed, and processed, the benefit of disease detection
____________ the risk of small doses of x-radiation. - Answers far outweighs
A ______________ may be a dental radiographer. - Answers - Dentist
- dental hygienist
-dental assistant
A new patient arrives to your dental office, and you will be the dental radiographer. Your assigned
responsibilities in regards to dental imaging may include - Answers education of patients about dental
imaging.
To avoid occupational exposure to x-radiation, the dental radiographer must always - Answers -
maintain an adequate distance
- have proper positioning
- have proper shielding.
- avoid the primary beam.
The nucleus of an atom contains - Answers protons and neutrons.
Which of the following statements is true of ionization? - Answers - An atom that gains an electron will
have a negative charge
- An atom that loses an electron will have a positive charge.
(1) Radiation is the emission and propagation of energy through space or a substance in the form of
waves or particles. (2) Radioactivity can be defined as the process by which certain unstable atoms or
elements undergo spontaneous disintegration, or decay, in an effort to attain a more balanced nuclear
state. - Answers Both statements are true.
Electromagnetic radiations - Answers include x-rays and visible light.
Which of the following forms of electromagnetic radiation are capable of ionization? - Answers X-rays
Heat is a byproduct of x-ray production. Which component of the x-ray tubehead dissipates the heat
created by the production of x-rays? - Answers Insulating oil
What is the purpose of the PID? - Answers It aims and shapes the x-ray beam.
Within the x-ray tube, electrons are generated by the - Answers tungsten filament in the cathode.
X-rays were discovered by: - Answers Wilhelm Roentgen
Which of the following was Otto Walkhoff's contribution to dental radiography? - Answers He made the
first dental radiograph.
Which of the following was the most recent development in the history of dental x-ray equipment? -
Answers Introduction of a recessed long-beam tubehead.
Current, fast film requires less than __% of the initial exposure times used for dental radiography in
1920. - Answers 2
The long-cone paralleling technique was introduced by ______________ in 1947. - Answers F. Gordon
Fitzgerald
Cassandra is a college sophomore visiting your dental office for an initial examination. Her dental history
reveals that her dental care has been infrequent throughout her childhood and young adulthood, and
no care in the past 18 months. Any previous dental radiographs would be long outdated. When
Cassandra is informed of the rationale and need for a current full-mouth series, she states that she read
on the Internet that dental x-rays are unnecessary and would expose her to needless, dangerous
radiation.
You explain to Cassandra that: - Answers radiographs enable the dental professional to identify many
conditions that may otherwise go undetected and to see conditions that cannot be identified clinically.
Which of the following is true regarding the component parts of an intraoral dental x-ray machine? -
Answers The position-indicating device (PID) extends from the tubehead opening.
The exposure light turns ________ and the beep ______ when the x-ray exposure is completed. -
Answers off; stops
Beam alignment devices and collimating devices are used to indicate the position of the _______ in
relation to the tooth and the receptor? - Answers position-indicating device (PID)
__________ is a device used to hold and align intraoral dental x-ray films in the mouth. - Answers film
holder
After exposing a few radiographic images, a few of the images appear light. You know that the exposure
times were set properly, and a quick check reveals the films have not been placed backward and the
processing chemistry are up to date. A possible solution could be: - Answers make sure to hold the
exposure button down until the end of the beeping sound.
Prior to ___________, no federal standards existed for the manufacturer of dental x-ray machines. -
Answers 1974
,The film emulsion is composed of a homogenous mixture of - Answers gelatin and silver halide crystals
___________ is the main component of the silver halide crystals in dental x-ray film. - Answers Bromide
The latent image is stored by the ______________ in dental x-ray film. - Answers silver halide crystals
The invisible pattern of stored energy on the exposed film is called the - Answers latent image
When would you use a two-film packet when taking radiographs on your patient? - Answers When a
duplicate record of a radiographic examination is needed.
What is the purpose of the lead foil sheet found within the film packet? - Answers To shield the film
from secondary backscattered radiation
When you are placing the film packet in your patient's mouth, which side of the film packet would you
place toward the patient's teeth? - Answers The solid white side
Your dentist asks you to take radiographs on your patient in order to check the interproximal surfaces of
the posterior maxillary and mandibular teeth for decay. Which type of film would be the best to take the
radiograph? - Answers Bite-wing film
Your dentist asks you to take radiographs on your patient in order to check the apex (tip) of the
mandibular left posterior teeth. Which type of film would be the best to take the radiograph? - Answers
Periapical
The size #2 dental x-ray film may be used for which types of radiographs? - Answers - Adult periapical
- Adult bitewing
- Occlusal for a 6 year old pediatric patient.
Which of the following film speed is the fastest film currently available? - Answers F-speed film
An intensifying screen is a smooth plastic sheet coated with minute fluorescent crystals known as -
Answers phosphors
Rare earth screens - Answers have phosphors that emit green light
Duplicating film - Answers is used to make an identical copy of an intraoral or extraoral radiograph
Film is best stored in an area that is - Answers cool and dry
An oral examination limits the practitioner to knowledge of what is seen clinically. Dental images allow
the practitioner to see many conditions that are not apparent clinically - Answers Both statements are
true.
Through the use of dental images, the dental radiographer can detect ________ that cannot be detected
clinically. - Answers - diseases
, - lesions
- lesions
When dental images are properly prescribed, exposed, and processed, the benefit of disease detection
____________ the risk of small doses of x-radiation. - Answers far outweighs
A ______________ may be a dental radiographer. - Answers - Dentist
- dental hygienist
-dental assistant
A new patient arrives to your dental office, and you will be the dental radiographer. Your assigned
responsibilities in regards to dental imaging may include - Answers education of patients about dental
imaging.
To avoid occupational exposure to x-radiation, the dental radiographer must always - Answers -
maintain an adequate distance
- have proper positioning
- have proper shielding.
- avoid the primary beam.
The nucleus of an atom contains - Answers protons and neutrons.
Which of the following statements is true of ionization? - Answers - An atom that gains an electron will
have a negative charge
- An atom that loses an electron will have a positive charge.
(1) Radiation is the emission and propagation of energy through space or a substance in the form of
waves or particles. (2) Radioactivity can be defined as the process by which certain unstable atoms or
elements undergo spontaneous disintegration, or decay, in an effort to attain a more balanced nuclear
state. - Answers Both statements are true.
Electromagnetic radiations - Answers include x-rays and visible light.
Which of the following forms of electromagnetic radiation are capable of ionization? - Answers X-rays
Heat is a byproduct of x-ray production. Which component of the x-ray tubehead dissipates the heat
created by the production of x-rays? - Answers Insulating oil
What is the purpose of the PID? - Answers It aims and shapes the x-ray beam.
Within the x-ray tube, electrons are generated by the - Answers tungsten filament in the cathode.
