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NDAEB EXAM STUDY GUIDE WITH COMPLETE QUESTIONS AND VERIFIED SOLUTIONS
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NDAEB EXAM STUDY GUIDE WITH COMPLETE QUESTIONS AND VERIFIED SOLUTIONS
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NDAEB EXAM STUDY GUIDE WITHCOMPLETE QUESTIONS AND VERIFIED
SOLUTIONS
What are the 3 primary methods in which chemical exposure
takes place? Correct Answer Inhalation, ingestion, and skin
contact.
What is a latent image? Correct Answer The image on the film
that is not yet visible because it has not been processed.
What does 'film speed' refer to? Correct 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? Correct Answer True
What is the fastest film speed currently available? Correct 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?
Correct Answer Intraoral film, extraoral film, and duplicating film.
When does a "Herringbone" pattern occur on dental film? Correct
Answer When it is placed in the mouth backwards.
What are the 5 basic sizes that intraoral film comes in? Correct
Answer Child Size: 0
Narrow Anterior: 1
Adult Size: 2
,Preformed bitewing: 3 (infrequently used)
Occlusal: 4
What are two common extraoral radiographs taken? Correct
Answer Panoramic and Cephalometric.
What is an intensifying screen? Correct 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.
What are the 5 steps in processing film? Correct 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? Correct Answer Bisecting & Paralleling
5 Basic Rules of the Paralleling Technique Correct 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? Correct Answer To ensure an area is not omitted or
exposed twice.
,What occurs if the horizontal angulation is incorrect? Correct
Answer Overlapping of teeth.
What two errors can occur if the vertical angulation is incorrect?
Correct Answer Foreshortened or elongated images.
What qualities must an endodontic x-ray have? Correct 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: Correct 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: Correct
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? Correct Answer
Use of a cone-shaped x-ray beam to acquire three-dimensional
information.
What is a film grid? (used for extraoral imaging) Correct Answer
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? Correct
Answer 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? Correct Answer
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? Correct Answer
Ghost images
If a lead apron is incorrectly placed on a pt during a panoramic
radiograph, what occurs? Correct Answer "Lead Apron Artifact" a
radiopaque cone-shaped artifact results.
What happens if a patient's chin is positioned too high during a
pan? Correct Answer It will create a "reverse smile line"
What happens if a patient's chin is positioned too low during a
pan? Correct Answer It will create an "exaggerated smile line"
What are three types of stress and strain? Correct Answer
Tensile stress: pulls and stretches a material Ex. tug-of-war
Compressive stress: pushes a material together. ex. chewing
Shear stress: the breakdown of material as the result of
something sliding over two areas. ex. cutting with scissors.
What is amalgam alloy powder composed of? Correct Answer
Silver - gives it its strength.
Tin - gives it workability and strength.
Copper - gives it strength and resistance to corrosion.
Zinc - to suppress oxidation.
What is the composition of a composite resin? Correct Answer 1.
An organic resin matrix.
2. Inorganic fillers.
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