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NDAEB Exam Prep Questions And Answers
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NDAEB Exam Prep Questions And Answers NDAEB Exam Prep Questions And Answers NDAEB Exam Prep Questions And Answers
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NDAEB Exam PrepWhat two basic methods are used to acquire a digital x-ray image? - ANS Direct imaging(sensor) &
indirect imaging(PSP)
Advantages of Digital Radiography - ANS 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 - ANS Cost, converting previous records to digital, learning the
computer software, thickness and rigidity of sensors, infection control
What is intraoral film composed of? - ANS 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? - ANS The image on the film that is not yet visible because it has not been
processed.
What does 'film speed' refer to? - ANS 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? - ANS True
What is the fastest film speed currently available? - ANS 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? - ANS Intraoral film, extraoral film, and
duplicating film.
When does a "Herringbone" pattern occur on dental film? - ANS When it is placed in the mouth
backwards.
What are the 5 basic sizes that intraoral film comes in? - ANS Child Size: 0
Narrow Anterior: 1
Adult Size: 2
Preformed bitewing: 3 (infrequently used)
Occlusal: 4
What are two common extraoral radiographs taken? - ANS Panoramic and Cephalometric.
What is an intensifying screen? - ANS 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.
What are the 5 steps in processing film? - ANS 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? - ANS Bisecting &
Paralleling
,5 Basic Rules of the Paralleling Technique - ANS 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? - ANS To ensure an area is
not omitted or exposed twice.
What occurs if the horizontal angulation is incorrect? - ANS Overlapping of teeth.
What two errors can occur if the vertical angulation is incorrect? - ANS Foreshortened or elongated
images.
What qualities must an endodontic x-ray have? - ANS 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: - ANS 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: - ANS 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? - ANS Use of a cone-shaped x-ray beam to acquire three-
dimensional information.
What is a film grid? (used for extraoral imaging) - ANS It is used to reduce the amount of scatter
radiation that reaches an extraoral film during exposure.
What is a Lateral Cephalometric Projection used for? - ANS Used to evaluate facial growth and
development, trauma, disease, and developmental abnormalities. It shows the bones of the face and
skull as well as the soft tissue profile.
What is a Posteroanterior Projection used for? - ANS Used to evaluate facial growth and development,
trauma, disease, and development abnormalities. It shows the frontal and ethmoid sinuses, the orbits,
and the nasal cavities.
What happens if a patient does not remove jewellery or metallic/radiodense objects from their
head/neck? - ANS Ghost images
If a lead apron is incorrectly placed on a pt during a panoramic radiograph, what occurs? - ANS "Lead
Apron Artifact" a radiopaque cone-shaped artifact results.
What happens if a patient's chin is positioned too high during a pan? - ANS It will create a "reverse smile
line"
What happens if a patient's chin is positioned too low during a pan? - ANS It will create an "exaggerated
smile line"
What are three types of stress and strain? - ANS Tensile stress: pulls and stretches a material Ex. tug-of-
war
Compressive stress: pushes a material together. ex. chewing
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