DAS 130 FINAL EXAM (2025) LATEST | 274
QUESTIONS | WITH COMPLETE SOLUTIONS!!
X-rays were discovered by: Answer - Wilhelm Roentgen
Which of the following was Otto Walkhoff's contribution to dental radiography?
Answer - He made the first dental radiograph.
Which of the following was the most recent development in the history of
dental x-ray equipment? Answer - Introduction of a recessed long-beam
tubehead.
Current, fast film requires less than __% of the initial exposure times used for
dental radiography in 1920. Answer - 2
The long-cone paralleling technique was introduced by ______________ in
1947. Answer - 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 Any previous dental radiographs would be long outdated.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: Answer - 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? Answer - The position-indicating device (PID) extends
from the tubehead opening.
The exposure light turns ________ and the beep ______ when the x-ray
exposure is completed. Answer - off; stops
Beam alignment devices and collimating devices are used to indicate the
position of the _______ in relation to the tooth and the receptor? Answer -
position-indicating device (PID)
__________ is a device used to hold and align intraoral dental x-ray films in the
mouth. Answer - 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: Answer - 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. Answer - 1974
The film emulsion is composed of a homogenous mixture of Answer - gelatin
and silver halide crystals
,___________ is the main component of the silver halide crystals in dental x-ray
film. Answer - Bromide
The latent image is stored by the ______________ in dental x-ray film. Answer
- silver halide crystals
The invisible pattern of stored energy on the exposed film is called the Answer
- latent image
When would you use a two-film packet when taking radiographs on your
patient? Answer - When a duplicate record of a radiographic examination is
needed.
What is the purpose of the lead foil sheet found within the film packet? Answer
- 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? Answer - 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? Answer -
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? Answer - Periapical
, The size #2 dental x-ray film may be used for which types of radiographs?
Answer - - Adult periapical
- Adult bitewing
- Occlusal for a 6 year old pediatric patient.
Which of the following film speed is the fastest film currently available? Answer
- F-speed film
An intensifying screen is a smooth plastic sheet coated with minute fluorescent
crystals known as Answer - phosphors
Rare earth screens Answer - have phosphors that emit green light
Duplicating film Answer - is used to make an identical copy of an intraoral or
extraoral radiograph
Film is best stored in an area that is Answer - 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 Answer - Both statements are true.
Through the use of dental images, the dental radiographer can detect
________ that cannot be detected clinically. Answer - - diseases
- lesions
- lesions
QUESTIONS | WITH COMPLETE SOLUTIONS!!
X-rays were discovered by: Answer - Wilhelm Roentgen
Which of the following was Otto Walkhoff's contribution to dental radiography?
Answer - He made the first dental radiograph.
Which of the following was the most recent development in the history of
dental x-ray equipment? Answer - Introduction of a recessed long-beam
tubehead.
Current, fast film requires less than __% of the initial exposure times used for
dental radiography in 1920. Answer - 2
The long-cone paralleling technique was introduced by ______________ in
1947. Answer - 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: Answer - 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? Answer - The position-indicating device (PID) extends
from the tubehead opening.
The exposure light turns ________ and the beep ______ when the x-ray
exposure is completed. Answer - off; stops
Beam alignment devices and collimating devices are used to indicate the
position of the _______ in relation to the tooth and the receptor? Answer -
position-indicating device (PID)
__________ is a device used to hold and align intraoral dental x-ray films in the
mouth. Answer - 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: Answer - 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. Answer - 1974
The film emulsion is composed of a homogenous mixture of Answer - gelatin
and silver halide crystals
,___________ is the main component of the silver halide crystals in dental x-ray
film. Answer - Bromide
The latent image is stored by the ______________ in dental x-ray film. Answer
- silver halide crystals
The invisible pattern of stored energy on the exposed film is called the Answer
- latent image
When would you use a two-film packet when taking radiographs on your
patient? Answer - When a duplicate record of a radiographic examination is
needed.
What is the purpose of the lead foil sheet found within the film packet? Answer
- 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? Answer - 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? Answer -
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? Answer - Periapical
, The size #2 dental x-ray film may be used for which types of radiographs?
Answer - - Adult periapical
- Adult bitewing
- Occlusal for a 6 year old pediatric patient.
Which of the following film speed is the fastest film currently available? Answer
- F-speed film
An intensifying screen is a smooth plastic sheet coated with minute fluorescent
crystals known as Answer - phosphors
Rare earth screens Answer - have phosphors that emit green light
Duplicating film Answer - is used to make an identical copy of an intraoral or
extraoral radiograph
Film is best stored in an area that is Answer - 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 Answer - Both statements are true.
Through the use of dental images, the dental radiographer can detect
________ that cannot be detected clinically. Answer - - diseases
- lesions
- lesions
