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Dental radiology practice questions
Terms in this set (24)
Wilhelm Conrad Roentgen
discovered x-rays in 1895
Cathode, anode and focusing cup
The dental X-ray tube contains
In a dental X-ray tube the electrons are emitted from the
True or false: x-ray is produced when electrons moving at high speed hit the tungsten target in a X-ray tube.
True or false: an assistant may hold the film in place for the patient during exposure time.
As soon as a film is placed in a patients mouth, it's considered contaminated.
Crowns and interproximal surfaces of teeth
Bitewing x-rays show
True or false: In the paralleling technique, the x-ray beam is directed perpendicular to the bisecting line between the angle of the long axis of the tooth and the film.
A, b, and c
Which are safety precautions for taking radiographs? A. Always stand behind an appropriate barrier. B. Never stand in the path of primary radiation. C. Never stabilize the tube head during exposure. D. If necessary hold the film in the patients mouth.
True or false. X-ray travel at the speed of light.
Nerve cells are more sensitive to radiation than lymphocytes.
Which of the following have an influence on radiation protection? A. Safe equipment b. Skilled operator. C. Lead aprons and thyroid collars. D. All of the above
Filters in an X-ray tube is made of. A. Lead. B. Aluminum. C. Concrete. D. Glass
The radiograph which reveal the entire teeth with the apical region is called a?
After use X-ray instruments should always be .... ?
I'm which digital system do we need a scanner? A. CCD. B. CMOS C. PSP D. all the above
Tree-like or lightning-like black streaks on a processed film are cause by? A. Bending the film. B. Over exposing. C. Underexposing or d. Static electricity
During pregnancy a patient A. may never be exposed to radiation b. May be irradiated by taking necessary precautions
Wash the films properly after fixing.
In your office, the radiographs tum brown with age almost all of the time. What corrective action can you take?
When the ID dot appears near the apex of a tooth, it means that: a. The film is mounted incorrectly. b. The film was placed in the film holder incorrectly. c. The patient has an abscessed tooth. d. Both a and b
A darkroom "safelight" should be at least _____ from the film being opened.
Overlapping is caused by: a. Cone cut b. Incorrect vertical angulation. C. Incorrect horizontal angulation d. Improper feeding of films in the processor.
d) Centered on the second premolar.
When exposing the mandibular molar area, what is the position of the film? a. Centered on the first molar, b. Centered on the second molar. c. Centered on the first premolar. d) Centered on the second premolar.
D. All the above
The harmful effects of x-rays are caused by a. Ionization b. Electromagnetic radiation c. Background radiation d. All of the above.
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