NDAEB EXAM ACTUAL TEST 2026 QUESTIONS
WITH VERIFIED ANSWERS
◉ 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.
◉ What is a Lateral Cephalometric Projection used for? 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? 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? Answer: Ghost
images
◉ If a lead apron is incorrectly placed on a pt during a panoramic
radiograph, what occurs? Answer: "Lead Apron Artifact" a
radiopaque cone-shaped artifact results.
◉ What happens if a patient's chin is positioned too high during a
pan? Answer: It will create a "reverse smile line"
◉ What happens if a patient's chin is positioned too low during a
pan? Answer: It will create an "exaggerated smile line"
◉ What are three types of stress and strain? 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? 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? Answer: 1. An
organic resin matrix.
2. Inorganic fillers.
3. A coupling agent.
4. pigments.
◉ What is the resin matrix in a composite resin? Answer: A fluid-like
material called dimethacrylate or BIS-GMA.
◉ What is the filler in a composite resin? Answer: Inorganic fillers in
a composite resin include quartz, glass, silica particles, and
colorants. They add strength and other characteristics needed in a
restorative material.
◉ Composites are classified by particle size as: Answer: Megafill,
macrofill, midifill, minifill, microfill, and nanofill.
, ◉ What is the coupling agent used for in a composite resin? Answer:
It strengthens the resin by chemically bonding the filler to the resin
matrix.
◉ What are pigments used for in a composite resin? Answer: So a
composite material can match a tooth colour.
◉ What is Polymerization? Answer: The process by which resin
material is changed from a pliable state into a hardened restoration.
This occurs through auto-curing or light-curing.
◉ True of false: Glass ionomers release fluoride? Answer: True.
◉ What is IRM? Answer: A reinforced zinc-oxide eugenol (ZOE)
composition. The eugenol has a sedative effect on the pulp.
◉ What do noble metals used for cast restorations consist of?
Answer: Gold, palladium, and platinum.
◉ What are the four types of gold alloys? Answer: 1. Soft, type I :
83% noble metals and are used for casting inlays.
2. Medium, type II : 78% noble metals and can be used for almost all
types of cast inlays and posterior bridge abutments
WITH VERIFIED ANSWERS
◉ 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.
◉ What is a Lateral Cephalometric Projection used for? 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? 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? Answer: Ghost
images
◉ If a lead apron is incorrectly placed on a pt during a panoramic
radiograph, what occurs? Answer: "Lead Apron Artifact" a
radiopaque cone-shaped artifact results.
◉ What happens if a patient's chin is positioned too high during a
pan? Answer: It will create a "reverse smile line"
◉ What happens if a patient's chin is positioned too low during a
pan? Answer: It will create an "exaggerated smile line"
◉ What are three types of stress and strain? 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? 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? Answer: 1. An
organic resin matrix.
2. Inorganic fillers.
3. A coupling agent.
4. pigments.
◉ What is the resin matrix in a composite resin? Answer: A fluid-like
material called dimethacrylate or BIS-GMA.
◉ What is the filler in a composite resin? Answer: Inorganic fillers in
a composite resin include quartz, glass, silica particles, and
colorants. They add strength and other characteristics needed in a
restorative material.
◉ Composites are classified by particle size as: Answer: Megafill,
macrofill, midifill, minifill, microfill, and nanofill.
, ◉ What is the coupling agent used for in a composite resin? Answer:
It strengthens the resin by chemically bonding the filler to the resin
matrix.
◉ What are pigments used for in a composite resin? Answer: So a
composite material can match a tooth colour.
◉ What is Polymerization? Answer: The process by which resin
material is changed from a pliable state into a hardened restoration.
This occurs through auto-curing or light-curing.
◉ True of false: Glass ionomers release fluoride? Answer: True.
◉ What is IRM? Answer: A reinforced zinc-oxide eugenol (ZOE)
composition. The eugenol has a sedative effect on the pulp.
◉ What do noble metals used for cast restorations consist of?
Answer: Gold, palladium, and platinum.
◉ What are the four types of gold alloys? Answer: 1. Soft, type I :
83% noble metals and are used for casting inlays.
2. Medium, type II : 78% noble metals and can be used for almost all
types of cast inlays and posterior bridge abutments
