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National Boards Dental Hygiene Exam 2024
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National Boards Dental Hygiene Exam 2024
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National Boards Dental Hygiene Exam 2024A film radiograph turns yellow-brown over a period of 5 months. What is the most likely
explanation?
Light leak in the dark room
Film was used past its expiration date
Inadequate washing of the film
Film was excessively fixed - ANSWER-Inadequate washing of the film
Excessively fixed= turns light
Past expiration=looks fogged/light
Light leak in dark room= turns dark/black
A maxillary molar PA may show all of the following anatomical landmarks except one.
Which one is the exception?
Maxillary tuberosity
Maxillary sinus
Zygomatic Process
Inverted Y - ANSWER-Inverted Y
A wall of bone that separates the nasal fossa from the maxillary sinus. It is seen above
the maxillary canines
A periapical radiograph is exposed with a phospher plate. After exposure, the student
opens up the packet in the clinic and leaves the plate under the white light. How will the
radiograph appear after it is scanned?
Light
Dark
Fogged
Blurry - ANSWER-Light
A periapical radiograph is intended to be exposed with a vertical angulation of +20
degree. The operator inaccurately uses a vertical angulation of +55 degree. What
problem will occur?
Foreshortening
Overlapping
Magnification
Unsharpness
Elongation - ANSWER-Foreshortening
A radiograph is a three-dimensional representation of a three-dimensional object
produced
, on an image receptor
True
False - ANSWER-False
A radiograph is a TWO-dimensional representation of a three-dimensional object
produced
on an image receptor
A radiograph is found to be too light. Which of the following could explain this problem?
Developer temperature too high
Exposure time too long
Light leak in the dark room
Exposure time too short - ANSWER-Exposure time too short
All the others will cause film to be too dark
According to the inverse square law, as the distance between the tungsten target and
film is increased, the:
Useful beam is less safe for the patient
Useful beam has greater intensity resulting a darker film
Useful beam is less intense
Useful beam is decreased in size - ANSWER-Useful beam is less intense
All of the following are examples of principles that contribute to an ideal radiographic
image except one. Which one is the exception?
• Small source of radiation
• Long target-to-object distance
• Long film-to-object distance
• Object parallel to the film
• Central ray perpendicular to the film - ANSWER-Long film-to-object distance
All of the following characteristics of the darkroom safelight are correct except one.
Which one is the exception?
At least 4 ft between the light and the film
Red filter safe for intraoral films
No more than 15 watts light bulb
Orange filter for extraoral films - ANSWER-Orange filter for extraoral films
"" for Intraoral NOT extraoral
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