Dental Radiology
- 1.
The harmful effects of radiation on human tissues are
- A.
Immediately exhibited
- B.
Insignificant
- C.
Usually acute
- D.
Cumulative
- E.
Painful
Correct Answer
D. CumulativeExplanation
The effects of repeated exposure to radiation are cumulative and can result in many different disorders such as cancer, cataracts, leukemia, and genetic abnormalities.Rate this question:
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- 2.
The protective lead apron must be impregnated with how much lead?
- A.
0.20 mm
- B.
0.22 mm
- C.
0.25 mm
- D.
0.30 mm
- E.
0.35 mm
Correct Answer
C. 0.25 mmExplanation
The lead apron must be impregnated with 0.25 mm of lead to be effective in shielding out the radiation.Rate this question:
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- 3.
You have a patient who had read articles describing the hazards of medical/dental radiation and is not sure about letting you take X-rays on her. Based on what you now know, how could you explain the procedures in a way that would be reassuring?
- A.
You are using a lead apron and lead thyroid shield.
- B.
You are using the long cone paralleling technique.
- C.
You take radiographs only when a need is indicated by clinical examination, not nased on an arbitrary time schedule.
- D.
Both a and b
- E.
All of the above
Correct Answer
E. All of the aboveExplanation
If you have a patient with concerns about radiation exposure, you should explain that you are using a lead apron and lead thyroid shield, you are using the long cone paralleling technique, and you take radiographs only when a need is indicated by clinical examination and not based on an arbitrary time schedule.Rate this question:
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- 4.
What do filters do in the X-ray beam?
- A.
Increase density and short waves
- B.
Reduce density
- C.
Reduce exposure time
- D.
Correct the size of the beam
- E.
Reduce patient radiation dose and remove the long waves
Correct Answer
E. Reduce patient radiation dose and remove the long wavesExplanation
Aluminum filters are used in the PID to filter out the long wanes. Only the short waves are useful in making an image on a film. Therefore, the filter removes the long waves and the patient receives less radiation.Rate this question:
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- 5.
The X-ray photons generated by the dental X-ray machine have
- A.
The same energy and wavelengths.
- B.
Many different wavelengths
- C.
Only a few energies capable of penetrating dense tissue
- D.
Many different speeds
- E.
None of the above
Correct Answer
B. Many different wavelengthsExplanation
The X-ray photons produced in the tube head have many different wave lengths.Rate this question:
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- 6.
What is the recommened collimation of the radiation beam at the patient's skin surface?
- A.
1.5 inches
- B.
2.75 inches
- C.
3.75 inches
- D.
2.75 cm
- E.
Both b and d
Correct Answer
B. 2.75 inchesExplanation
The recommended collimation or restriction of the size of the X-ray beam at the patient's face is 2.75 inches.Rate this question:
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- 7.
What does the ALARA concept stand for?
- A.
As low as reasonably achievable
- B.
As little as radiation is allowable
- C.
As low as radiation is around
- D.
As long as reasonably allowable
- E.
None of the above
Correct Answer
A. As low as reasonably achievable -
- 8.
Which of the following devices is an example of personnel monitoring?
- A.
Film badge
- B.
Pocket dosimeter
- C.
Film ring
- D.
Both a and c
- E.
A, b, and c
Correct Answer
E. A, b, and cExplanation
Film badges, pocket dosimeters, and film rings are all example of personnel monitoring devices that measure the dose of radiation received by the members of the dental team.Rate this question:
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- 9.
The transfer of energy as it passes through matter is called
- A.
Reproduction
- B.
Cumulative
- C.
Mutation
- D.
Absorption
- E.
Energize
Correct Answer
D. AbsorptionExplanation
The energy of the X-ray beam is transferred to the material through which it passes. This transfer of energy is called absorption.Rate this question:
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- 10.
What is it called when a lead disc is used for the elimination of the peripheral portion of the X-ray beam?
- A.
Filtration
- B.
Collimation
- C.
Elongation
- D.
Ionization
- E.
Absorption
Correct Answer
B. CollimationExplanation
Collimation means that a lead disc is used for the elimination of the peripheral portion of the X-ray beam. The lead disc is called the collimator. It restricts the size of the X-ray beam at the patient's face.Rate this question:
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- 11.
Which molecular changes occur in a living organsim being struck by photons?
- A.
Molecules break into smaller pieces.
- B.
New bonds form within molecules.
- C.
Molecular bonds are disrupted.
- D.
New bonds form between new molecules.
- E.
All of the above
Correct Answer
E. All of the aboveExplanation
When a living organism is struck by photons, the molecules are broken into smaller pieces, they form new bonds within themselves and with other molecules, and some molecular bonds are disrupted.Rate this question:
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- 12.
What is the correct vertical angulation used when taking a bitewing radiograph?
- A.
0 degrees
- B.
+10 degrees
- C.
-10 degrees
- D.
+30 degrees
- E.
+5 degrees
Correct Answer
B. +10 degreesExplanation
+10 degrees vertical angulation is the correct vertical angulation for taking bitewing radiographs to produce minimal geometric distortion and open the contacts between the teeth.Rate this question:
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- 13.
In the bisecting the andle technique, where is the vertical angel of the central beam directed?
- A.
Parallel to the film
- B.
Perpendicular to the line bisecting the angel made by the film and the side of the tounge
- C.
Parallel to the long axis of the tooth
- D.
Perpendicular to the line bisecting the angle made by the long axis of the tooth and the film
- E.
Both b and d
Correct Answer
D. Perpendicular to the line bisecting the angle made by the long axis of the tooth and the filmExplanation
In the bisecting the angle technique, the vertical angle of the beam is directed perpendicular to the line that bisects the angle made by the film and the long axis of the tooth being radiographed.Rate this question:
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- 14.
What is true of a full-mouth X-ray series?
- A.
Always has periapical and bitewings
- B.
Has a minimum of 20 films
- C.
Can be replaced by a panoramic film
- D.
Varies in need and number of films according to selection criteria and mouth size
- E.
Both a and d
Correct Answer
A. Always has periapical and bitewings -
- 15.
In dental radiography, what infection control procedures are included?
- A.
Sterilization
- B.
Disinfection
- C.
Anitspetic agents
- D.
Both a and b
- E.
All of the above
Correct Answer
D. Both a and bExplanation
In dental radiography, the Snap-A-Ray film holders and XCP film holders are sterilized and the treatment room is disinfected. No antiseptic agents are used.Rate this question:
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- 16.
What is the safest postion for an operator while exposing an intraoral film?
- A.
Behind the head of the X-ray unit
- B.
Behind a lead barrier
- C.
At a 45 degree angle to the opposite side of the patient's head
- D.
Both b and c
- E.
All of the above
Correct Answer
B. Behind a lead barrierExplanation
Standing behind the lead barrier is the safest place for the operator while exposing intraoral films.Rate this question:
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- 17.
What does immersing the contaminated exposed film packet in a disinfecting solution do?
- A.
Disinfects it
- B.
Destroys the image
- C.
Takes too long
- D.
Makes the images clearer
- E.
None of the above
Correct Answer
B. Destroys the imageExplanation
Exposed film should never be immersed in a disinfecting solution. Immersing them in any liquid will destroy the image. However, it is acceptable to wipe the exposed films with a dry paper towel to remove any saliva or blood.Rate this question:
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- 18.
What nees to happen wheeen exposing a full-mouth set of radiographs?
- A.
The PID need not be covered with a barrier if gloves are worn
- B.
A film dispenser should be used
- C.
Unexpected film should be kept on the counter in the room
- D.
The exposure button should be covered with a plastic barrier
- E.
None of the above
Correct Answer
D. The exposure button should be covered with a plastic barrierExplanation
Covering the exposure button with a plastic barrier is part of the infection control protocol for exposing X-rays.Rate this question:
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- 19.
Where in the X-ray head does thermionic emission take place?
- A.
Tungsten target
- B.
Tungsten filament
- C.
Step-down transformer
- D.
PID
- E.
Both a and b
Correct Answer
B. Tungsten filamentExplanation
Thermionic emission, which is when the electrons are boiled off of the tungsten filament, takes place in the cathode at the tungsten filament.Rate this question:
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- 20.
Which radiographic technique records the most accurate image of crowns, roots, and supporting structures?
- A.
Bitewing film
- B.
Panoramic film
- C.
Periapical film
- D.
Occlusal film
- E.
Extraoral film
Correct Answer
C. Periapical filmExplanation
The periapical intraoral film records the most accurate image of crowns, roots, and supporting structures.Rate this question:
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- 21.
The bicuspid/premolar bitewing radiograph should be placed to include which of the following anatomic structures?
- A.
All of the mandibular cuspid
- B.
The distal half of the mandibular cuspid
- C.
The distal half of the maxillary cuspid
- D.
The mesial half of the maxillary first premolar
- E.
The distal half of the mandibular first molar
Correct Answer
B. The distal half of the mandibular cuspidExplanation
Proper film placement for the bicuspid/premolar bitewing radiograph must include the distal half of the mandibular cuspid. This way the bicuspid will appear in the center of the radiographRate this question:
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- 22.
What is the primary diagnotic use of a bitewing radiograph?
- A.
Check for unerupted teeth
- B.
Register the appearance of supporting structures such as bone and soft tissue
- C.
Show a crown preparation, placement, and residual excess cement.
- D.
Check the length of the canal for endodontic procedures.
- E.
Check for interproximal decay and crestal bone levels.
Correct Answer
E. Check for interproximal decay and crestal bone levels.Explanation
The primary diagnostic use of a bitewing radiograph is to check for interproximal decay and examine the crestal bone levels.Rate this question:
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- 23.
The size-1 film would most likely be used to radiograph which of the following areas on an adult patient?
- A.
Incisors and cuspids
- B.
Maxillary bicuspids
- C.
Mandibular bicuspids if the floor of the mouth is too shallow
- D.
Mandibular bicupids
- E.
Both a and c
Correct Answer
A. Incisors and cuspidsExplanation
In a 20-film mount full-mouth set of X-rays, the central incisors, lateral incisors, and cuspids are radiographed using a size-1 film.Rate this question:
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Jan 28, 2013Quiz Edited by
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Jul 21, 2011Quiz Created by
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