quiz #3+final
Terms
undefined, object
copy deck
- Radiographs should be made of injured teeth because
- the full extent of the injury may not be otherwise apparent
- Elongation of the teeth in an x-ray film results from the
- veritical angle being too low
- If the target film distance is increased
- the exposure time is also increased
- substances penetrated by x-rays include
- tissue and bone
- If the cone does not cover the film, the result on the radiograph will be
- a partial image
- x-rays of _______ wavelenghts are most efficent in producing dental radiographs
- short
- The pebbly side of the film is positioned
- toward the x-ray beam
- The required thickness of aluminum filters for machines operating above 75 kVp is
- 2.5 millimeters
- Film requiring an intensifying screen are
- extraoral films
- THe tissue which appears as a fine white line on the edge of bone around the root of the tooth in an x-ray is called
- lamina dura
- Material that apears the most opaque in a dental radiograph is
- amalgam
- A radiolucent substance will produce a _________ image on the processed film
- dark
- The ______ energy rays cause unnecessary radiation to tissue and result in poor radiographs
- lower
- Dental radiographs are the property of the
- dentist exposing the radiograph
- The type of x-ray film used to examine the apex of a tooth is
- periapical
- Radiographs that show only the crowns of the teeth are
- interproximal
- Blurred radiographs may result from
- movement during exposure
- The cephalometric tracing is used for each of the following except
- planning for restorative procedures
- The body structures most sensitive to ionizing radiation is
- reproductive organs
- The cells of the body least suscepectible to radiation x-rays are
- muscle cells
- What is the purpose of fixing solution
- removing the unexposed crystals that were unaffected by the developer solutions
- The main ingredient in the developer is
- water
- THe fixing solution is
- acidic
- The acetic does what
- preserves the fixer
- A ________ will appear on an x-ray film if it was not washed long enough
- yellow-brown stain
- If films are not fixed for correct amount of time they will appear to have a _____
- brown tint
- The ideal temp for the developing solution is _________ max
- 70 degrees/75 degrees
- What is the gelatin suspension of silver halide salts called on an x-ray film?
- emulsion
- What are the uses of the lead foil in an x-ray packet?
-
stops unused radiation
prevents film fog - What is the x-ray tube housing made up of?
- glass
- As the target film distance is increased, there is
- less distortion
- X-rays are made of
- photons
- Is the penetrating power of x-rays the KVP or the MA?
- KVP
- Why must we have proper collimation
- reduce radiation to the patient 2 3/4
- What does the milliamperage control?
- controls the amount of radiation
- The cathode has a filament and it is composed of what material?
- tungsten
- The thickness of the lead diaphragm is
- 1/16th of an inch
- The lead apron contains how many millimeters of lead?
- 0.25mm
- What is the theory for the paralleling technique?
- The central rays are directed perepndicular to the film which is parallel to the long axis of the tooth
- What is the bisecting angle technique?
- ceontral rays must be projected perpendicularly to a plane bisecting angle formed by the longitudinal axis of the tooth and plane of the film packet
- When is the ala-tragus line parallel to the floor?
-
max periapical
interproximal
max occlusal - If a patient gags easily, teh dental assistant should...
-
do anterior teeth first
have the patient hold their breath
have patient rinse with mouth wash - The logical sequence for taking a full mouth set of x-rays is
- upper arch, bite wings, lower arch
- Occlusal films are used to determine
- buccolingual orientation of a tooth (cheek to tongue)
- The maximum whole body dose per week for those who work with radiation is
- .3 rems
- Extra oral films are _____ than intra oral films.
- more sensitive
- The speed of the dental film is determined by the amount _________
- amount of x-rays needed
- If the MA is increased while the KVP and exposure time is the same, the films will appear ______
- darker
- Scatter radiation is a form of _______
- secondary radiation
- What causes film fog?
- Light leak in the darkroom
- Cephalometric x-rays are used in ____
- orthodontics
- If the target-film distance is increased, the ___________
- exposure time is also increased
- For minimal exposure to the patient,
- group E film is used.
- The temperature of the processing solution is adjusted by a ________
- water bath
- The occlusal plane of the arch should be _________
- parallel to the floor