NDAEB ACTUAL TEST PAPER 2026 QUESTIONS
WITH SOLUTIONS GRADED A+
◉ 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
◉ 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.
◉ 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.
◉ 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)
WITH SOLUTIONS GRADED A+
◉ 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
◉ 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.
◉ 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.
◉ 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)
