問題一覧
1
using an F speed rather than an E speed film to produce a radiograph results in?
less patient exposure
2
a dental xray machine operating at 75kvp is required to have a total aluminum filtration of ?
2.5mm
3
every radiographic retake represents ?
an unnecessary doubling of patient exposure
4
which of these position indicating device is least effective in minimizing radiation scatter ?
pointed cone
5
radiation history should include all of the following except ?
background radiation exposure
6
lead aprons should be used ?
on all patients
7
all but which of the following are important to minimize patient exposure to radiation ?
not utilizing selection criteria to prescribe radiographs
8
dental radiographs should be taken ?
to aid in diagnosis
9
before prescribing dental radiographs, which of the following are needed ?
all of the above
10
the most important use of x-rays in dentistry is ?
diagnosis
11
the occupational radiation dose will be kept to zero if ?
all of the above are correct
12
the MPD is best defined as ?
the maximum dose of ionizing radiation that is not expected to cause injury
13
what cannot be used to check the reliability of the xray machine and protective barriers ?
coin test
14
which of the following is true regarding film badges ?
film badges should be worn so they are not blocked by pens or jewelry
15
which of the following , if sufficient, could provide adequate shielding ?
all of the above could be adequate
16
each successive full mouth survey , appears lighter than the one before. which of the following corrections should be made ?
change the developer solution
17
a major difference between automatic and manual processing of radiographs is that automatic processing?
require special solutions at high temperatures
18
in developing radiographs, the fixer acts to?
remove unexposed and undeveloped silver halide from the film and harden the emulsion
19
if the temperature of the processing solutions is slightly above normal, radiographs of desired density may be best obtained by?
decreasing the developing time
20
a latent image ?
invisible until the film is processed
21
an exposed radiograph should remain in the fixed in order to attain archival life for ?
twice the developing time
22
the effect of safe light illumination in the darkroom does not depend on which of the following ?
size of the darkroom
23
a radiograph is clear after processing. this could result from any of the following except ?
exposure to white light
24
in the time temperature method of processing dental radiographs, the thermometer is ?
kept in the developer bath
25
which is the correct order for manually processing radiographs ?
develop, rinse, fix, wash, dry
26
manufactures recommend that radiographic developing solutions be covered to prevent ?
emission of an oxidizing agent
27
the coin test of a safelight in the darkroom shows a clear outline of the coin. what does this mean ?
the safelight is faulty
28
if the films are fed into the automatic processor too rapidly, what can happen?
films will stick together
29
every patient should have a current medical history that?
all of the above are valid statements
30
using disinfecting solutions on the dental x-rays unit is not recommended because..
the solution may seep into the electrical connections
31
microorganisms can remain viable on radiographic equipment for at least ?
48hrs
32
when taking a full mouth series of radiographs?
the exposure switch should be covered with plastic
33
a reason for using the paralleling method instead of the bisecting method is ?
all of the above
34
in taking the radiograph you did not center the beam on the film packet in the patients mouth. the resulting film will show ?
collimator cutoff
35
a set of radiographs all show thin images. one possible error that could have caused this is ?
excessive FFD
36
if a film packet is placed in the patients mouth with the wrong side facing the xray beam, the resulting film will?
have a thin image with a geometric pattern on it
37
the failure to remove partial dentures while taking radiographs may cause ?
superimposition of the metallic object on the film
38
a lon cone ( 16inch FFD) is used in the paralleling technique to?
avoid magnification of the image
39
using a localizing ring with a film holder helps in preventing?
collimator cut off
40
the projection most likely to excite the gag reflex is the ?
maxillary molar projection
41
the best way to prevent patient movement during intraoral radiography is ?
good operator technique
42
a full mouth survey
varies in need and number of films according to selection criteria and mouth size
43
another correct way to refer to the paralleling method is ?
right angle technique
44
in order to avoid creating an artifact on the apex of the tooth when placing the film in the film holder, which of the following statements is accurate ?
“ the dot “ should be in the “ slot “
45
placement of the premolar projection should include ?
all of the above
46
the posterior topographic view of the villa can be considered a topographic view of the ?
maxillary sinus
47
when using the bisecting angle technique for a maxillary premolar projection, the point of entry is ?
the most anterior part of the cheekbone
48
the best way to visualize a salivary stone in the floor of the mouth is by using ?
mandibular right angle occlusal projection
49
occlusal film is classified as size ?
4
50
for the maxillary molar periapical projection, the center of the film packet should be aligned with?
the middle of the second molar
51
in the bisecting technique, if the central ray is not perpendicular to the film packet in the horizontal plane, the resulting film will be ?
overlapped
52
what would be the projection of choice to visualize a large in the midline of the palate?
maxillary topographic occlusal
53
when using the bisecting technique, the point of entry for the mandibular molar projection is the ?
roots of the molars
54
the film speed of occlusal film is ?
the same as periapical film
55
the best projection to decide whether an impacted maxillary cuspid is located bucally or lingually is the ?
maxillary right angle occlusal
56
the bisecting angle technique may be an advantageous technique to use with ?
all of the above
57
object scatter degrading the image is not a concern in panoramic radiography ?
because of the narrow slit beam
58
each successive panoramic film appears lighter than the one before. which of the following correction should be made ?
change the developer solution
59
which of the following anatomic structures is usually not seen on intraoral periapical radiographs but is seen on pantomograms?
mandibular foramen
60
if the lead apron is placed too high on the patient
it will create a large RO on the film
61
the main reason for taking a panoramic radiograph would be ?
to see the borders of a lesion that are larger than periapical film
62
panoramic radiographs cannot be used for detection of ?
caries and periodontal disease
63
the main advantage of using intraoral source for panoramic radiography is ?
significant reduction in patient radiation dose
64
advantages of panoramic radiography include all of the following except ?
overuse
65
the best extraoral projection for viewing an impacted left mandibular third molar is ?
left lateral oblique
66
grids are used to?
reduce object scatter
67
in extraoral radiography , an increased FFD is necessary to ?
increase the beam divergence
68
extraoral cassettes..
all of the above
69
if all of your extraoral films appear dense and fogged after processing while your intraoral films are satisfactory, the probable cause is ?
the safelight is too intense
70
extraoral films are processed
by the time temperature method
71
the major disadvantage of using extraoral projections with screens in dentistry is ?
decreased definition
72
a conventional panoramic radiograph will show both the right and left joints in ?
the lateral plane
73
the standard dental xray unit
can be used for digital radiography
74
the storage phosphor sensor is?
thinner than direct sensors
75
the type of digital imaging system that is similar to scanning a document is ?
optically scanned digital radiography
76
the human eye can discern about
32 gray levels
77
darkroom and processing capability is needed in ?
optical scanning digital radiography
78
the most critical part of a digital radiographic system is the
sensor
79
digital imaging for panoramic units
is now available
80
a hard copy is
a computer printout
81
in direct digital radiography, a digital image can be generated in anywhere from?
1.5 to 5 mins
82
the major difficulty in using direct digital radiography is ?
placing the sensor parallel to the tooth
83
digital images ..
all of the above
84
digital intraoral sensors are ?
quite fragile
85
all of the digital imaging systems differ in how they ?
acquire the digital image
86
the main application of MRI in dentistry has been in imaging
the particular disc of the TMJ
87
part of the quality assurance program includes maintaining the conditions of protective devices such as ?
all of the above
88
the most critical part of a darkroom quality assurance program is ?
monitoring the chemical strength and level of the processing solutions
89
processing solutions should be changed ?
every 2 to 3 weeks