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Dental Radiography 12, 13, 15, 5, 6 Flashcards | StudBud
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Dental Radiography 12, 13, 15, 5, 6
Dental Radiography 12, 13, 15, 5, 6
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1
Which is a modified paralleling technique image receptor positioner for use with bisecting technique?
Shorten the long biteblock
Use a sterile cotton roll to change angulation
Remove indicator aiming device
Ignore the color coding when assembling holder
2
When a biological response is based on the probability of occurrence rather than the severity of the change, it’s called
Stochastic
Long term
Deterministic
Short term
3
Which intraoral technique satisfies more shadow casting principles?
Bisecting
Paralleling
4
Anterior PAs are placed vertically in the oral cavity
False
True
5
What’s the approximate vertical angulation for adult BWs?
+10 degrees
0 degrees
-10 degrees
+20 degrees
6
Which size image receptor is used and how is it positioned for an anterior BW of a small and narrow adult arch?
Size 3 placed vertically
Size 0 placed horizontally
Size 1 placed vertically
Size 2 placed horizontally
7
Which of these are considered short-term outcomes following radiation exposure?
Embryological defects
Cancer
Acute radiation syndrome
Cataracts
8
Which of the following contributes the most to reducing patient radiation exposure?
F-speed film
E-speed film
D-speed film
9
An incorrect point of entry will result in
Conecutting
Overlapping
Cutting off the root apices
Foreshortening
10
Which is the correct seating position for the pt during X-ray exams when an image receptor w/o an external aiming device
Occlusal plane perpendicular and midsaggital plane parallel to the floor
Occlusal plane parallel and mid sagital plane perpendicular to the floor
Occlusal and midsaggital planes parallel to the floor
Occlusal and midsaggital planes perpendicular to the floor
11
Image receptor placement for an adult vertical premolar BW is to align the receptor so that the
Central and lateral incisors are centered
Anterior portion of the receptor lines up behind the distal half of canine
Anterior portion of receptor lines up behind distal half of 2nd premolar
Canine is centered
12
A dose-response curve indicating that any amount of radiation, has potential to cause a biological response called
Nonstochastic
Threshold
Stochastic
Nonthreshold
13
Which is NOT a radiation safety feature of an FDA approved handheld dental X-ray device?
Additional shielding around the PID
A removable battery
A leaded acrylic external back scatter ring shield
Increased inherent tube head shielding
14
Which of the following settings would the PID be pointing to the floor?
0
-30
+20
15
Who has an ethical responsibility to adopt ALARA?
Dental assistants
All the above
Dental hygienists
Dentists
16
An increase in each of the following puts a cell in a radiosensitive state EXCEPT
Specialization
Metabolic rate
Mitosis activity
Presence of immature cells
17
Based on age, which patient would potentially be most radiosensitive?
6-year-old
16-year-old
26-year-old
46-year-old
18
Which intraoral technique is based on the rule of isometry?
Paralleling
Bisecting
19
When an effect of radiation exposure is observed in the offspring of an irradiated individual but not the individual
This kind of effect is called somatic
This kind of effect is called genetic
This kind of effect is called indirect
This kind of effect is called direct
20
Which is best sequencing for exposing a full mouth series of periapical radiographs?
Max post, man post, max ant, man ant
Man ant, max ant, man post, max post
Man post, max post, man ant, max ant
Max ant, man ant, max post, man post
21
The animal maximum permissible whole-body dose for the general public is
0.5 mSv
50 mSv
500 mSv
5.0 mSv
22
Cutting of the root apex portion of the image on a PA radiograph results from
Inadequate horizontal angulation
Excessive horizontal angulation
Excessive vertical angulation
Inadequate vertical angulation
23
What shadow casting principle is NOT likely to be met when utilizing the paralleling technique?
Object and image receptor should be as close as possible to each other
Object should be as far as practical from target
Radiation should strike the object and image receptor perpendicular
Object and image receptor should be parallel to each other
24
A right-handed radiographer, when taking 8 vertical BWs, would place and expose which of the following first?
Left canine
Left premolar
Right premolar
Left molar
25
Which of these is NOT an intraoral radiograph?
Bitewing
Periapical
Occlusal
Panoramic
26
Which radiograph is used most often to detect proximal surface dental decay?
Pero apical
Occlusal
Panoramic
Bitewing
27
To compensate for the increased object-image receptor distance needed for parallelism, target-image receptor distance
Should decrease
Should increase
28
Each of the following aids in reducing patient radiation exposure EXCEPT
Slow-speed film
Careful film handling
Image receptor holders
Darkroom protocol
29
What’s the minimum total filtration required by dental X-ray machine that can operate in ranges above 70 kVp?
2.5mm of aluminum equivalent
1.5mm of aluminum equivalent
2.5mm of lead equivalent
1.5mm of lead equivalent
30
During dental X-ray exposure, the lead thyroid collar with apron should be placed on
Males
Children
Females
All patients
31
Where should the film packet embossed identification dot be positioned when taking a PA?
Toward middle of the oral cavity
Toward the incisal or occlusal edge of the tooth
Toward the palate or floor of the mouth
Toward the distal or back of the arch
32
When taking a premolar horizontal BW, anterior edge should be positioned behind distal edge of max canine when presented
With Class I occlusion
With Class IV occlusion
With Class III occlusion
With Class II occlusion
33
Image receptor placement for an adult horizontal molar BW is to align the receptor so that the
Canine is centered
Anterior portion of the receptor lines up behind the distal half of canine
Central and lateral incisors are centered
Anterior portion of receptor lines up behind distal half of 2nd premolar
34
How many size 2 receptors are required by most practices for exposure of posterior X-rays for FMX?
Seven
Five
Six
Eight
35
TLD, OSL, and DIS dosimeters are used to
Monitor radiation exposure a dental radiographer may incur
Protect an operator from unnecessary radiation exposure
Reduce the radiation exposure received by patient
Record an on-site survey of the radiation output of the X-ray unit
36
An error in vertical angulation will result in
Come cut
Overlapping
Overexposure
Unequal distribution of the arches
37
What PID length provides best quality X-ray images when utilizing the paralleling technique?
16 inches
12 inches
8 inches
38
Which factors DO NOT need to be considered when deciding image receptor size for FMX?
Patients ability to tolerate the image receptor
Previous accumulated exposure
Age of patient
Shape of dental arches
39
The potential risk of an FMX exam inducing cancer in a patient has been estimated to be
3 per 10,000 examinations
3 per 1,000 examinations
3 per 1,000,000 examinations
3 per 100,000 examinations
40
Line image receptor behind R/L central and lateral incisors to include Mesial halves of R/L canines describe which PA?
Canines
Central incisors
Premolars
Molars
41
The primary cause of biological damage from radiation is
Genetic effect
Indirect effect
Direct effect
Ionization
42
Which best expresses comparisons between dental radiation exposures and natural background exposure?
Accumulated dose
Effective dose equivalent
Absorbed dose
Lethal dose
43
What’s the minimum image receptor requirement for an adult FMX of PAs?
16
12
18
14
44
Which of the conditions would vertical BWs be recommended over horizontal BWs?
Adult with periodontal disease
Adolescent with suspected third molar impact ion
Child with rampant caries
Adult with malalighned teeth
45
Which of these conditions would NOT be visible on a BW?
Alveolar bone resorption
Overhanging restoration
Apical abscess
Proximal surface caries
46
For horizontal angulation for man premolar PA, central rays should be at the image receptor perpendicularly through the
Embrasures of the 2nd premolar and 1st molar
Embrasures of the canine and 1st premolar
Embrasures of the 1st and 2bd molars
Embrasures of the 1st and 2nd premolars
47
Indirect injury from radiation occurs when X-ray photons
Strike critical cell molecules
Break DNA bonds in the cell nucleus
Pass through the skin into deeper tissues
Ionize water and form toxins
48
Communication, knowledge of a quality X-ray, and education all aid in unnecessary radiation exposure by
Creating a longer target-surface distance
Using low exposure factors
Reducing the risk of retake radiographs
Collimating and filtering the primary beam
49
Which of these cells/tissues is most radioresistant?
Mature cartilage
Skin cell
Blood-forming cell
Lens of the eye
50
Lining image receptor behind distal of canine to include 1st and 2nd premolars and mesial half of first molar describes
Canine radiographs
Molar radiographs
Premolar radiographs
Central incisor radiographs
51
To determine horizontal angulation for max molar PA, central X-rays should be at the image receptor perpendicularly
Through embrasures of the 1st and 2nd molars
Through the embrasures of the 1st and 2nd premolars
Through the embrasures of the canine and 1st premolar
Through the embrasures of the 2nd premolar and 1st molar
52
An error in which of these results in overlapping?
Vertical angulation
Point of entry
Horizontal angulation
Placement of image receptor
53
X-ray tube head must be swiveled from side to side to adjust the vertical angulation of the X-ray beam.
False
True
54
To avoid overlap error the central rays of the X-ray beam must be perpendicular to the curvature of the arch
False
True
55
An image receptor positioned/holder must be used with
All the above
The paralleling technique
The bisecting technique
The Bitewing technique
56
Image receptor positioners designed for use with paralleling technique should have
Short biteblock and no backing
Short biteblock and L-shaped backing
Long biteblock and no backing
Long biteblock and L-shape backing
57
Which of the following exposes a patient to less radiation?
16 inch (41 cm) round PID
16 inch (41 cm) rectangular PID
12 inch (30 cm) round PID
8 inch (20.5 cm) round PID
58
Which is NOT considered critical for dental radiography?
Lens of the eye
Spinal cord
Thyroid gland
Mandible
59
The annual maximum permissible whole-body dose for oral health care personnel is
5.0 mSv
50 mSv
0.5 mSv
500 mSv
60
How many standard size 2 image receptors are recommended for posterior BW on an adult?
4
8
7
2
61
Which interproximal space should central rays be perpendicularly directed when exposing molar BW on a child’s primaries
Between the 1st and 2nd molars
Between lateral incisor and canine
Between canine and 1st molar
Between central and lateral incisors
62
Each are factors in determining occurrence of tissue injury from radiation EXCEPT
Amount of radiation dose
Rate at which the dose is delivered
Size of the irradiated area
Gender of patient
63
Most important reason for using an image receptor positioner when using paralleling technique is to stabilize in a
Position parallel to the teeth
Position at a longitudinal relationship to the teeth
Position at a right angle of the teeth
Position perpendicular to the teeth
64
Th e best rationale for taking vertical BWs is that vertical BWs
Result in less overlapping than horizontal BWs
More easily tolerated by most patients
Eliminate the need for PAs
Image more alveolar bone than horizontal BWs
65
Whats the recommendation for BWs for an adult recall pt with no clinical Carie’s and no high-risk factor for caries?
Every 18-24 months
Every 6-12 months
Every 12-18 months
Every 24-36 months
66
What’s the federally mandated maximum diameter size of the primary beam at the end of a round PID (at pt’s skin)?
4.75 inches (12 cm)
1.75 inches (4.5 cm)
2.75 inches (7 cm)
3.75 inches (10 cm)
67
All are a shadowing principle EXCEPT
Object and image receptor should be as close as possible
Object and image receptor should be perpendicular to each other
Radiation should strike the object and image receptor perpendicularly
Object should be as far as practical from target
68
If a protective barrier isn’t present, whats the recommended minimum distance that the operator should stand?
3 ft
6 ft
12 ft
9 ft
69
Which interproximal space should central rays be perpendicularly directed when exposing premolar BW on teen w/permanents
Between the 1st and 2nd premolars
Between lateral incisor and canine
Between central and lateral incisors
Between canine and 1st premolar
70
Which is the correct sequence of events following radiation exposure?
Recovery period, latent period, period of injury
Latent period, recovery period, period of injury
Period of injury, latent period, recovery period
Latent period, period of injury, recovery period
71
Which of these cells/tissues is most radiosensitive?
Lymphocyte
Mature bone
Brain cell
Nerve cell
72
In which of the following situations would using a size 3 image receptor be acceptable?
Horizontal BWs on a pediatric patient who presented with a need for them
Horizontal BWs on an adult patient for Carie’s detection
Vertical BWs on any patient who presented with a need for them
Horizontal BWs on an adult patient with periodontal disease
73
Which of the following is NOT an advantage of the paralleling technique?
Minimizes superimposition of adjacent structures
Satisfies more shadow casting principles
Produces images with minimal dimensional distortion
Easy technique for children to tolerate
74
Central X-rays perpendicular to the plane of image receptor and long axes of teeth describes which step of paralleling?
Point of entry
Placement
Vertical angulation
Horizontal angulation
75
Posterior PAs are placed horizontally in the oral cavity
False
True