Dental Chapter 38 Recall Questions
What is the maximum permissible dose of radiation for occupationally exposed people?
5.0 rems/year.
What does the control panel contain?
A master switch, an indicator light, selector buttons, and exposure buttons.
What shows up on an radiolucent film?
Air soaces, soft tissues, abcesses, tooth decay and dental pulp.
What is the positive electrode inside the X-ray tube called?
Anode
What shows up on a radiopaque film?
Body structures that radiation can not easily pass through.
Who was the first person to make practical use of radiographs in Dentistry?
C. Edmund Kelly's
What is the negative electrode inside the X-ray tube called?
Cathode
What is the process that results in the harmful effects of the x-ray?
Ionizing radiation.
What is the exposure factor that controls contrast?
KVP
What is the name of the time period between x-ray exposure and appearance of symptoms?
Latent period
What are the precautions that should be taken when one is handling the lead apron?
Never fold it when stored.
What are the three types of radiation?
Primary, secondary, and scatter radiation.
What are the three characteristics of the x-ray beam?
Quality, quanitiy, and intensity.
What is density?
The overall darkness or blackness of an image.
What is ionization?
The process by which electrons are removed from electrically stable atoms.
What are the primary components of a dental x-ray machine?
The tubehead, the extension arm, and control panel.
What is the purpose of the aluminum filter?
To remove low energy, long wavelengths, and the least penetrating x-rays from the beam.
What is the purpose of the collimator?
To restrict the size and shape of the x-ray beam to reduce patient exposure.
What are the two systems of radiation measurement?
Traditional system and systems international.
What is the most effective measure in reducing a patient's exposure to radiation?
Using a fast-speed film.
What is genetic effects?
When damage cells are passed on to succeeding generations.
What is radiolucent?
When the film apoears dark.
What is radiopaque?
When the film appears light.
Who discovered x-rays?
Wilhelm Conrad Roentgen
