BU DENTAL RADIOLOGY FINAL TEST QUESTIONS &
ANSWERS
What does the x-ray tube contain? - Answers - cathode anode and focusing cup
Who discovered what x-rays were? - Answers - Wilhelm Conrad Roentgen
In a dental x-ray tube the electrons are emitted from the what? - Answers - Cathode
X-ray is produced when electrons moving at a high speed hit the tugstnen target in a x-
ray tube. T or F - Answers - True
an assistant may hold the film or sensor in place for the pt during exposure - Answers -
False
As soon as a film or sensor is placed in a pt's mouth it is considered contaminated? -
Answers - True
X-rays are ionizing radiation. - Answers - True
Bitewings show what? - Answers - Crowns and permant fixtures are interporximal
surfaces of the teeth.
In the paralleling technique the xray is directed perpendicular to the bisecting line
between the angle of the long axis of the tooth and the film/sensor - Answers - True,
explain.. So when you are parallelling, the angle you make when you are bisecting is
perpendicular to the angle
Pt;s should be drapped with a led apron prior to any radiographic images? - Answers -
True
Which if not a safety precaution for taking x-rays?
-Always stand behind an appropriate barrier?
-Never stand in the path of primary radiation
-Never stabilize the tube head during radiation
-If neccessary hold the film in the pt's mouth - Answers - If neccessary hold the film in
the pt's mouth, never hold the film or sensor in the pts mouth.
X-rays travel at the speed of light? - Answers - True
Nerve cells can be regennerated? - Answers - False, No- Dense things like bone can
and perm fixtures, restorations.
Which of these have an infulence on radiation protection?
-Safe equipment
, -Skilled operator
-Lead aprons and thyroid collars
-All of the above - Answers - All of the above
Filters in an x-ray tube is made of what? - Answers - Aluminum
The radiographs which reveal the entire teeth with the apical region is called what? -
Answers - Periapical
X-ray instruments should always be what? - Answers - Sterlized
Tree-like lightening black streaks on a processed film are caused by what? - Answers -
Static electricity when drying
During pregancy a partiant may be irradiated by taking necessary precations? True or
False - Answers - True
In your office the radiographs turn brown with age almost all of the time. What corrective
action do you take? - Answers - Wash the film properly after fixing
When the ID dot appers near the apex of the tooth it means what? - Answers - The film
was placed in the holder incorrectly
A darkroom safe light should be at least how many feet away from the film being
opened? - Answers - 4 feet
Overlapping of teeth is caused by what? - Answers - Incorrect horiziontal angulation
When exposing the mandubular molar area, what is the position of the film? - Answers
- Centered on the second molar
The harmful effect of x-rays are caused by what?
-Ionizaiton
-Electromagnetic radiation
-Background radiation
-All of the above - Answers - All of the above
Overall darkness of a radiograph is called what? - Answers - Dentsity
Electrons are what - Answers - Negatively charged
Neutrons are - Answers - Neutrally charged
Protons are - Answers - Postively charged
Binding energy is what - Answers - Force that keeps electrons in their place
ANSWERS
What does the x-ray tube contain? - Answers - cathode anode and focusing cup
Who discovered what x-rays were? - Answers - Wilhelm Conrad Roentgen
In a dental x-ray tube the electrons are emitted from the what? - Answers - Cathode
X-ray is produced when electrons moving at a high speed hit the tugstnen target in a x-
ray tube. T or F - Answers - True
an assistant may hold the film or sensor in place for the pt during exposure - Answers -
False
As soon as a film or sensor is placed in a pt's mouth it is considered contaminated? -
Answers - True
X-rays are ionizing radiation. - Answers - True
Bitewings show what? - Answers - Crowns and permant fixtures are interporximal
surfaces of the teeth.
In the paralleling technique the xray is directed perpendicular to the bisecting line
between the angle of the long axis of the tooth and the film/sensor - Answers - True,
explain.. So when you are parallelling, the angle you make when you are bisecting is
perpendicular to the angle
Pt;s should be drapped with a led apron prior to any radiographic images? - Answers -
True
Which if not a safety precaution for taking x-rays?
-Always stand behind an appropriate barrier?
-Never stand in the path of primary radiation
-Never stabilize the tube head during radiation
-If neccessary hold the film in the pt's mouth - Answers - If neccessary hold the film in
the pt's mouth, never hold the film or sensor in the pts mouth.
X-rays travel at the speed of light? - Answers - True
Nerve cells can be regennerated? - Answers - False, No- Dense things like bone can
and perm fixtures, restorations.
Which of these have an infulence on radiation protection?
-Safe equipment
, -Skilled operator
-Lead aprons and thyroid collars
-All of the above - Answers - All of the above
Filters in an x-ray tube is made of what? - Answers - Aluminum
The radiographs which reveal the entire teeth with the apical region is called what? -
Answers - Periapical
X-ray instruments should always be what? - Answers - Sterlized
Tree-like lightening black streaks on a processed film are caused by what? - Answers -
Static electricity when drying
During pregancy a partiant may be irradiated by taking necessary precations? True or
False - Answers - True
In your office the radiographs turn brown with age almost all of the time. What corrective
action do you take? - Answers - Wash the film properly after fixing
When the ID dot appers near the apex of the tooth it means what? - Answers - The film
was placed in the holder incorrectly
A darkroom safe light should be at least how many feet away from the film being
opened? - Answers - 4 feet
Overlapping of teeth is caused by what? - Answers - Incorrect horiziontal angulation
When exposing the mandubular molar area, what is the position of the film? - Answers
- Centered on the second molar
The harmful effect of x-rays are caused by what?
-Ionizaiton
-Electromagnetic radiation
-Background radiation
-All of the above - Answers - All of the above
Overall darkness of a radiograph is called what? - Answers - Dentsity
Electrons are what - Answers - Negatively charged
Neutrons are - Answers - Neutrally charged
Protons are - Answers - Postively charged
Binding energy is what - Answers - Force that keeps electrons in their place
