NDAEB Exam Prep Questions & Answers (A+)
What two basic methods are used to acquire a digital x-ray image? Answer-Direct
imaging(sensor) & indirect imaging(PSP)
Advantages of Digital Radiography Answer-Immediate viewing of images, less radiation,
no chemicals, ability to enhance images, commu...
NDAEB Exam Prep Questions & Answers (A+)
What two basic methods are used to acquire a digital x-ray image? Answer-Direct
imaging(sensor) & indirect imaging(PSP)
Advantages of Digital Radiography Answer-Immediate viewing of images, less radiation,
no chemicals, ability to enhance images, communication with other dentists, no more lost films,
remote consultation capability
Disadvantages of Digital Radiography Answer-Cost, converting previous records to digital,
learning the computer software, thickness and rigidity of sensors, infection control
What is intraoral film composed of? Answer-Film Base - Clear Cellulose Acetate
Thin Adhesive Layer
Silver Halide Crystals - absorb radiation
A protective layer to protect the emulsion surface.
What is a latent image? Answer-The image on the film that is not yet visible because it
has not been processed.
What does 'film speed' refer to? Answer-The amount of radiation that is required to
produce a radiograph of standard density.
True or false: The larger the silver halide crystals, the faster the film speed? Answer-True
, NDAEB Exam Prep Questions & Answers (A+)
What is the fastest film speed currently available? Answer-F-Speed. (It reduces patient
exposure to radiation by 20-60% compared to E or D speed film)
What are the 3 types of x-ray film used in dental radiography? Answer-Intraoral film,
extraoral film, and duplicating film.
When does a "Herringbone" pattern occur on dental film? Answer-When it is placed in
the mouth backwards.
What are the 5 basic sizes that intraoral film comes in? Answer-Child Size: 0
Narrow Anterior: 1
Adult Size: 2
Preformed bitewing: 3 (infrequently used)
Occlusal: 4
What are two common extraoral radiographs taken? Answer-Panoramic and
Cephalometric.
What is an intensifying screen? Answer-A device that intensifies or increases the effect of
radiation and thus decreases the amount of exposure time needed. It is coated with phosphor
which gives off light when struck by x-radiation.
, NDAEB Exam Prep Questions & Answers (A+)
What are the 5 steps in processing film? Answer-1. Developing (reduce the silver halide
crystals into black metallic silver)
2. Rinsing (remove developer from film)
3. Fixing. (use an acidic solution to remove unexposed silver halide crystals)
4. Washing (wash the film)
5. Drying
What are the two techniques that can be used for exposing intraloral images? Answer-
Bisecting & Paralleling
5 Basic Rules of the Paralleling Technique Answer-1. Placement: it must cover correct
teeth to be examined
2. Position: it must be parallel to the long axis of the tooth.
3. Vertical Angulation: Central ray must be directed perpendicular to the receptor & tooth.
4. Horizontal Angulation: Central ray must be directed through the contact areas.
5. Central Ray: it must be centered on the receptor.
Why is it important to have an 'exposure sequence' for receptor placement? Answer-To
ensure an area is not omitted or exposed twice.
What occurs if the horizontal angulation is incorrect? Answer-Overlapping of teeth.
, NDAEB Exam Prep Questions & Answers (A+)
What two errors can occur if the vertical angulation is incorrect? Answer-Foreshortened
or elongated images.
What qualities must an endodontic x-ray have? Answer-Tooth centered on the image
At least 5mm of bone visible beyond apex of the tooth
The image is as anatomically accurate as possible
Two methods of mounting radiographs are: Answer-1. Labial mounting method:
radiographs placed in the mount with the raised dots facing up (as if the viewer is looking
directly at the pt)
2. radiographs placed in the mount with the raised dots facing down (as if the viewer is inside
the patients mouth looking out)
Two types of panoramic machines are in use today: Answer-Film-based imaging & direct
digital imaging. The main difference is the image receptor, digital units use a sensory array
rather than film.
What is Cone Beam Computed Tomography? Answer-Use of a cone-shaped x-ray beam to
acquire three-dimensional information.
What is a film grid? (used for extraoral imaging) Answer-It is used to reduce the amount
of scatter radiation that reaches an extraoral film during exposure.
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