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radiology exam 2 > test 2 > Flashcards

test 2 Flashcards

1
Q

the dental x ray films serves as a recording medium or

A

image receptor

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2
Q

image receptor refers to

A

a picture or likeness of an object

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3
Q

the term receptor refers to something that responds to

A

stimulus

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4
Q

film base is a

A

thin flexible (blue tinted to enhance contrast and image quality) covered with photographic emulsion on both sides

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5
Q

adhesive holds

A

emulsion to film on both sides

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6
Q

emulsion is

A

is a gelatin with suspended silver halides salt crystals. When placed in water the gelatin swells exposing the silver salts to the developing sol’n. As the gel dries and shrinks, the smooth surface left becomes the radiograph.

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7
Q

During radiation exposure, the x-rays strike and ionize some, but not all, of the

A

silver halide crystals, resulting in the formation of a latent image (invisible image).

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8
Q

Radiation striking the film causes

A

ionization of the silver halide

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9
Q

true or false

The amount of radiation is dependent upon what it passes through first.

A

true

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10
Q

The silver halide salts in the gelatin is very sensitive to

A

xrays

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11
Q

. The more radiation these crystals absorb

A

the darker the image will be.

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12
Q

Processing fluids react with these crystals to

A

produce a visible image on the film

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13
Q

On dental film

A

90-99% of the salts are silver halide

-1-10% is silver iodide

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14
Q

A Protective Layer, or supercoating of gelatin protects

A

the emulsion layers

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15
Q

composition of DentalX-ray Film

A

Film base
Adhesive
Emulsion
Protective layer

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16
Q

What is a thin flexible (blue tinted to enhance contract and image quality covered with photogaphic emulsion on both sides

A

Film base

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17
Q

What holds emulsion to film on both sides

A

adhesive

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18
Q

Emulsion is

A

a gelatin with suspended silver halides salt crystals. When placed in water the gelatin swells exposing the silver salts to the developing sol’n. As the gel dries and shrinks, the smooth surface left becomes the radiograph

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19
Q

During radiation exposure, the x-rays

A

strike and ionize some, but not all, of the silver halide crystals, resulting in the formation of a latent image (invisible image).

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20
Q

Radiation striking the film causes

A

ionization of the silver halide. The amount of radiation is dependent upon what it passes through first.

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21
Q

The silver halide salts in the gelatin is

A

very sensitive to x-rays. The more radiation these crystals absorb the darker the image will be.

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22
Q

Processing fluids react with these crystals to

A

produce a visible image on the film

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23
Q

Silver halide crystals

A

On dental film
-90-99% of the salts are silver halide
-1-10% is silver iodide
A Protective Layer, or supercoating of gelatin protects the emulsion layers

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24
Q

Outer Film Packet

A

Mechanical barrier which is a plastic envelope-like package which protects the film from light, scratches, etc.
Identification dot is visible on the back of the packet- the flap side with color. This raised dot on the film denotes front and back or which side is up.
This dot is ALWAYS placed in the holder 1st
White side toward PID

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25
Q

Intraoral film packets showing the front or tube side (white, unprinted side of the film packet) (top) and the back side (color-coded side) of the film packet (bottom).

A

WHITE SOLID is top

COLOR CODED IS BOTTOM

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26
Q

layers of x ray film

A

Photograph of the back of an open film packet. (1) Moisture-resistant outer wrap. (2) Black paper. (3) Film. (4) Lead foil backing.

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27
Q

BLACK PAPER

A

The paper protects the protective layer over the emulsion on the film base.
Shields film base from light.
A processing error occurs when this black paper is loaded into the processor with the film

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28
Q

LEAD FOIL

A

Sheet of lead nearest the flap side of the packet therefore the back of the packet. Its purpose is to absorb backscatter radiation- that is deflected radiation back toward the film.
Note the embossed pattern on the end. This is called a herringbone pattern. This pattern along with a much lighter film appears when the operator puts the film in the holder backwards.

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29
Q

TYPES OF FILM

A

Intraoral
Extraoral
Duplicating

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30
Q

Types of Dental X-ray Film

intraoral

A 
Film packet
Packaging
Speed groups
Film size
Types of projections
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31
Q

intraora film packet review

A

Intraoral-film packets containing 1 or 2 film, black paper, wrapping, lead, foil, outer wrapping
Each film has raised dot on the corner. The raised portion is the front of the film
Black paper helps keep light out
Lead foil helps absorb scatter radiation and prevents back-scatter to fog image. A herringbone pattern appears when film is placed backwards.

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32
Q

film speed

A

the faster the film, the less radiation is required

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33
Q

the larger the crysta

A

the faster the film but the grainier the sharpness

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34
Q

the thicker the emulsion

A

the faster the film

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35
Q

special radiosensitive dyes

A

incease film speed

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36
Q

FILM SPEED

A F D

A

A is the slowest and F is the fastest

Only D and F film is still available

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37
Q

FILM SIZES

A

Size 0- Pedo
Size 1- Pedo and adult anterior where palate is narrow
Size 2-standard PA
Size 3-Longer for BW’s
Size 4-Occlusal films 2 ¼ inches by 3 inches

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38
Q

T OR F

With the exception of the large occlusal film, all intraoral film sizes are available both with and without an attached bitetab for use in taking bitewing projections.

A

TRUE

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39
Q

bite wing views

A

BW- views of crowns of teeth and alveolar crests and caries

    • views of maxilllary and mandibular teeth on the same film
    • views to some extent the occlusion of molars
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40
Q

Periapical

A

PA—named for the apex of tooth

–views the entire tooth and the surrounding bone

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41
Q

occlusall radiograph

A

survey large areas especially the floor of the mouth

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42
Q

Extraoral film—screen

A

screen film-image is from intensifying fluorescent light instead of directly from x-rays
Packaging
Film size
5 x 7 lateral views of the TMJ, Jaw, etc
8 x 10 cephalometric profiles—orthodontist
5 x 12 or 6 x 12 panoramic film

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43
Q

intensifying screens

A

Transfers x-ray energy into visible light

- allows for much less radiation since intensified
- smooth plastic almost looks like cardboard
- coated with minute fluorescent crystals called phosphors
- when exposed to x-rays phosphors fluoresce and emit blue or green light
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44
Q

in extraora film

Screen film must be placed between

A

intensifying screen inside of a cassette either rigid or flexibl

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45
Q

in extral oral film blue…

A

Blue sensitive film must be paired with blue light screens. This is a conventional tungstate screen where the phosphors emit blue light.

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46
Q

in extra oral film the newer rare earth screen

A

The newer rare earth screen phosphors emit green light and must also be paired with green sensitive film. The rare earth need even less radiation than the blue.

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47
Q

dupicaing film

A

Only one side is coated with emulsion and appears dull
non-emulsion side is shiny and appears darker (this side is away from the radiograph)
Dull side toward radiograph being copied
Does not use x-rays but light so film is light sensitive

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48
Q

Radiograph film is extremely sensitive to:

A 
Radiation
Light
Heat and humidity
Chemical fumes
Physical pressure
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49
Q

film storage

A

Film should be stored in original packaging in a lead-lined or a fog film box
Keep away from “the line of fire” from the tubehead
Keep away from ligh
Keep in a cool dry place
The darkroom is hotter and has chemical fumes so should not be a storage area
Do not put heavy items on top to create pressure
Shelf life date is printed on the box
t

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50
Q

Radiolucent refers to the portion of the radiograph

A

black or dak

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51
Q

A diagnostic radiograph has both

A

black and white portions with many areas of gray.

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52
Q

Radiolucent-portion on the film that is dark or black—the x-rays pass through the tissues

A

with little or no resistance so the majority strike the film causing darkness

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53
Q

Radiopaque- the light or more white portions on a radiograph– fewer x-rays

A

can pass through dense structure or tissues so fewer x-ray actually strike the film

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54
Q

examples of radiolucent

A

soft tissue and air spaces

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55
Q

exampes of radioopaque

A

enamel
denitn
bone

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56
Q

Density-

A

the overall blackness of a radiograph. In other words, it must have enough color to be viewed when light is shined through it. Too dark is just as bad as too light.

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57
Q

Milliamperage, kilovoltage, and exposure time

A

are setting factors of density

also thickness makes a difference

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58
Q

Amt of light transmitted through a film
Less dense-
More dense-

A

Less dense- much light transmitted

More dense- less light transmitted

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59
Q

density is the blackness that results

A

Is the blackness that results from the darkening of crystals in the emulsion of the film caused by interaction with x-ray photons.
More photons = darker film

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60
Q

CONTRAST

A

can be defined as the difference between how black and white with many shades of gray. The more visible shades of gray, the longer the contrast scale and the better the radiograph. This is low contrast. More detail is distinquishable.

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61
Q

Low contrast or long-scale contrast result when

A

higher kvp is used

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62
Q

think of contrast like the

A

keys on a piano
The longer the piano keyboard, the more keys are available to play more notes and therefore more of a song than if you only used a few keys.
So we want L and L—low and long contrast

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63
Q

contrast can also be definied as the visibe

A

difference between densities on a radiograph which is dependent upon the object being filmed (subject) and the film

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64
Q

Subject contrast

A

a. there must be some difference
example: factory x-raying bolts
b.Increased kV produces lower contrast, more grays which is good
Decreased kV produces higher contrast which is bad
c. Scatter radiation

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65
Q

penetrometer tests demonstrate

A

radiographically that a longer contrast scale results from the use of 100 kilovolt exposures. Dental radiographs exposed at 100 kVp have long-scale contrast. Radiographs exposed at 65 kVp have short-scale contrast.

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66
Q

exposed at 60 kVp, has

A

high contrast

67
Q

exposed at 90 has

A

low contrast

68
Q

output consistency test is monitored by

A

using stepwedge which is a device with layered metal steps of varying thickness to determine film density and contrast. It may also be used to test the strength of the chemicals

69
Q

stepwedge is place on a

A 
#2 film and exposed. This is compared to a reference film.
Reference film is film that is taken on a different day and is considered acceptable
70
Q

sharpness is

A

The clarity of the outline of the structures are dependent upon:

a. Geometric factors
b. Crystal size in the film emulsion-the larger the crystal the less sharp the image
71
Q

penumbra

A

a shadowing around an object, a “halo effect” related to

  1. Focal spot size- smaller is better
  2. Long Target- object distance
  3. Short Object- film distances
  4. Paralellism-absolute must
  5. Perpendicular relationship of the central ray to the object and the film
72
Q

the three subject contras or Radi. image

A

subject
kvp
scattered radiation

73
Q

film contrast for rad image

A

film type
exposure
processing

74
Q

geometric factos

A 
focal spot size
target fim distance
object film distance
motion 
screen thickness
screen film contact
75
Q

a small focal spot

and a large

A

increases sharpness

decreases

76
Q

long target

short target

A

increase sharpness

decrease

77
Q

short target film

long object film

A

decrease sharpness

increase

78
Q

no movement

movement

A

sharp image

fuzzy image

79
Q

thin screen

thick screen

A

increase sharp

decrease sharp

80
Q

small crystals

large crystals

A

increase sharpness

decrease

81
Q

geometric factors

A

A. Focal spot
a.Decreased focal spot increased sharpness
b.If patient or film moves—motion increases focal spot
B. Target Film Distance
a. anode distance to the film
b. PID are 8 or 16 inches
c. decreasing distance makes the beam more divergent

82
Q

Geometric factors continued

A

C. Object Film Distance
a. distance of teeth to film
b. decreased distance increases sharpness and decreases magnification
D. Motion-decreases sharpness

E. Screen thickness (intensifying screens)
Are made of crystals that emit light when struck by x-rays. Light intensifies image
Use of screen decreases sharpness
Increasing thickness of screen decreases sharpness
F. Screen Film Contact

83
Q

Crystal Size

A

The crystal size in the film emulsion is important in sharpness. We will cover indepth in Chapter 7, but in essence decreasing the crystal size increases sharpness.

84
Q

Magnification

A

Mostly influenced by the target-object-distance (which is the length of the PID for our purposes) and the object-film distance
The longer the PID the less magnification but there is an increase in sharpness

85
Q

distortion

A

Unequal magnification usually caused by the film not being parallel to the teeth thus the x-rays are not penetrating at a perpendicular angle

86
Q

Varying exposure factors

A

mA=the amount of x-rays generated
Increasing the mA darkens the radiograph
Decreasing mA lightens the radiograph

Exposure time
Increasing time darkens the radiograph
Decreasing time lightens radiograph
This is a factor that you can and may change especially for children

87
Q

increasing kv gives a

A

shorter wavelength and increases the energy thus increasing penetration.
This is the only factor that directly influences contrast

88
Q

If mA is the amount of radiation and kV is the INTENSITY of radiation,

A

then if you increase kV you must decrease mA or decrease the exposure time to compensate

89
Q

Rule: For every 15 kV increase,

A

divide the time in half (time/2). For every 15 kV decrease double you time (timex2).

90
Q

target surface

target film

A

Target-surface-anode to skin (error, not pushing ring in next to face)
Target-film—-Anode to film
Increasing distance decreases magnification, increases sharpness and decreases penumbra

91
Q

true or fase

4–5 Using a small focal spot on the target, a long target–film distance, and a short object–film distance will result in a sharp image.

A

true

92
Q

Large focal spot on the target and long object

A

film distance results in more penumbra and therefore loss of image sharpness.

93
Q

movement of tube head

A

Motion, even slight, of the tube head will effectively create a larger surface area of the focal spot, resulting in penumbra

94
Q

The operator must take into account several distances to produce the ideal diagnostic quality image:

A

The distance between the x-ray source and the surface of the patient’s skin
The distance between the object to be x-rayed and the film
The distance between the x-ray source and the recording plane of the film

95
Q

processings is

A

is bringing the latent or hidden (invisible) image on the film to a visible useful radiograph

Preserves the visible image so that a permanent record is created and does not disappear or deteriorates over time

96
Q

reduction is when

A

the exposed halide portion through chemical processed is removed leaving the black metallic silver.

97
Q

Selective Reduction removes

A

ALL unexposed silver halides leaving nothing.

98
Q

Reduction is achieved

A

by the developing solution. Selective Reduction occurs in the fixer.
Developer + rinsing + fixer + rinsing + drying

99
Q

The film is then placed in fixer solution. The fixer removes

A

the unexposed silver halides and creates the white or clear areas.

100
Q

grays

A

Grays are differing amounts of radiation passing through.

101
Q

clear film means

A

no radiation struck the film

102
Q

steps in manual processing

A

Developing- solution reduces the silver halide to black metallic solution
Rinsing- purpose is to remove as much of the alkaline developer as possible (fixer lasts longer)
Fixing-removes unused silver halide
Washing- removes any chemicals that may be left
Drying- air or heated to dry film for handling

103
Q

Automatic Film Processing Solutions

A

Developer
Fixer
Hardening agents
Replenisher

104
Q

a fixer

A

Stops further film development—keeps image permanently
Removes undeveloped silver halide
Hardens emulsion
You will not need to know individual chemical names

105
Q

Manual Film Processing

A 
Equipment
Maintenance
Preparation 	
Procedure
Following the procedure
106
Q

the idea floating ttempfor manual fim is

A

68 degrees five minutes

107
Q

automati film processing

A

Faster, usually within 5 minutes
Better quality
Roller transport moves film through the developer, fixer, water and drying compartments in a timed environment
Does require a warm-up
Solutions are supersaturated and contain more hardener in the developer

108
Q

AUTOMATIC FILM PROCESSING CONTINUED

A

Some units automatically replenish solutions and others are operator dependent
REQUIRE TIMELY CLEANING
Rollers must be cleaned or film gets stuck or film is streaked
If your rollers are appearing silver, not clean
Care must be taken when processing multiple films to not overlap

109
Q

A cleaning film (large extraoral film) should be run through the processor

A

at the beginning of each day before use to clean the rollers. This is in addition to the rollers removal and washed with running water at proper intervals.

110
Q

SAFELIGHT

A

A commercially available bracket-type lamp with safelight filter shielding the short wavelength, blue-green region of the visible light spectrum given off by the bulb. The light given off by this filter would appear dark red.

111
Q

need to know

A

Because of heating chemicals, the processor is the cause of fires in dental offices
In the darkroom, everything needs to be put in the same place every time

112
Q

duplicators

A

Usually contain built-in ultraviolet light and a timer.
Duplicating film comes in panorex size sheets with emulsion only on one side which looks dark. The non-emulsion side appears shiny. Put the dull side against the radiograph with shiny side up.
The machine is turned on. Light is emitted. All of this under darkroom conditions. Then the film is sent through the developer just like an x-ray film would be.

113
Q

NEVER, NEVER, EVER RELEASE

A

original films

114
Q

film duplications

A

Duplicate radiographs for the patient, for referral, for transfer, for consultations, for publication, etc.
Duplicate radiographs are copies of the original and maybe obtained through a 2 film pack or through use of a duplicator.

115
Q

duplicators

A

Usually contain built-in ultraviolet light and a timer.
Duplicating film comes in panorex size sheets with emulsion only on one side which looks dark. The non-emulsion side appears shiny. Put the dull side against the radiograph with shiny side up.
The machine is turned on. Light is emitted. All of this under darkroom conditions. Then the film is sent through the developer just like an x-ray film would be.

116
Q

Developing errors

A

Underdeveloped film-light image- weak solutions or too little time in solutions
Overdeveloped film-dark image-developer is too hot, rollers got hung up keeping film in solution too long or timer is messed up
Reticulation of emulsion-cracked appearance- too big a difference in temperature between developer and fixer

117
Q

if the film appears green on one side and blurred on the other it means

A

two fils run through the processor together

118
Q

A Herringbone pattern across one end of the film and a lighter image overall indicates

A

the film was placed in the holder backwards

119
Q

Cone cut indicates the ring

A

was not placed on the XCP properly or the PID was not lined up with the ring properly

120
Q

an artifact

A

artifact is anything that appears that does not add diagnostic quality

121
Q

Static electricity caused

A

by incorrect handling of film

122
Q

what do we want to see in BW

A

Open Contacts

Detection of Decay

123
Q

bitewings

A

Bitewings (BW’s) or interproximal radiographs may be taken using film holders or paper bite tabs
The BW should show the crowns of both maxillary and mandibular teeth in the same radiograph with open contacts between the teeth
The teeth should be in occlusion

124
Q

bite wings again

A 
BW’s are usually 2 or 4 films  but a complete set of 7-8 vertical BW’s may be taken for periodontally involved teeth
The film is placed horizontally usually with standard film
#3 film is longer and usually requires only 1 per side but it is more narrow and shows less crestal bone and does not open contacts as well due to curve of the arch
125
Q

bw anguation

A

BW vertical angulation is approximately +10 degrees which corrects for the slight buccal inclination of the maxillary teeth otherwise is would be zero angulation
Failure to have proper inclination of the PID results in showing one arch more than the other which means missing crestal bone levels

126
Q

angulation again

A

More than 10 degrees shows more maxillary teeth
Less than 10 degrees shows more mandibular teeth
So if a question asks if you are showing too much of one arch over the other, the error is in Vertical angulation

127
Q

film holders vs bitetabs

A 
Bitetabs are more versatile
Attach to the white side of the film
Does not have external aiming device
Not as bulky in the mouth
Film holders
Have external aiming device
Uncomfortable and bulky
Biteblock is thicker so less alveolar bone is visible
128
Q

compromised film placement

A

Most common reason for poor BW’s is poor film placement due to
Patient complaints of discomfort or gagging
Tori
Shallow palate
Patient inability or refusal to open wide enough

129
Q

central lateral bitewing

A 
Film Position
Aligned with distal edges of the canines
Vertical position
Central Ray
Perpendicular to film at +100 angulation
130
Q

canine bitewing

A 
Film Position
Centered on mandibular canine, parallel to mean tangent
Vertical position
Central Ray
Perpendicular to film at +100 angulation
131
Q

premolar bitewing

A

Film Position
Must be positioned so that the resulting film shows both the maxillary and mandibular premolars and the distal contact areas of both canines.
Film is parallel to plane of mandibular premolars
Tube Head angulation
Horizontal: Central beam directed perpendicular to the film plane
Vertical: Central beam +100

132
Q

What Is an Acceptable Premolar Bitewing?

A

Open contacts between:
Canines and first premolars
First and second premolars
Occlusal plane in the middle of the film

133
Q

molar bitewing

A

Film Position
Must be positioned so that the resulting film shows both the maxillary and mandibular molars and the distal contact areas of the premolars.
Film is parallel to plane of mandibular molars
Tube Head angulation
Horizontal: Central beam directed perpendicular to the film plane
Vertical: Central beam +100

134
Q

What Is an Acceptable Molar Bitewing?

A

Open contacts between:
Distal contact of the second premolar and first molar
First and second molars and the second and third molar (if present)
Occlusal plane in the middle of the film

135
Q

NOTE

A

The contact between the upper first and second molars is often closed on the molar bitewing and open on the premolar bitewing!

136
Q

errors

A

Tilted films
Patient does not maintain pressure when biting
Patient swallows
Tori, etc obstructs film placement
Top edge of film is slanted due to touching tooth or palate
Poor placement on YOUR part
Not enough teeth to properly bite

137
Q

film mounting is

A

the placement of radiographs in a holder that has the films arranged in an anatomical order
The advantages of this is the ease of viewing and interpreting in the correct order. There is less chance of error of misidentifying the tooth or reversing left and right.

138
Q

film mounts may be fabritated out of

A

celluloid, cardboard, or plastic.

There are numerous combinations of sizes and number of frames

139
Q

2 methods of mounting

A

Labial mounting method
Views as if you are standing in front of the patient and looking at them.
If I am holding a set of full mouth radiographs, the side in my left hand is the patient’s right side and the side is my right hand is the patient’s left side.
Imagine standing in front of the patient and bending the mount around their face, the radiograph will match the teeth.
MOST COMMON

  1. Lingual Mounting
    1. Views as if you are standing behind the patient so what is in your right hand is the patient’s right side and the left is the left.
    2. Seldom used
140
Q

interpretation may be defined as

A

reading the radiograph and explaining what is observed in terms the patient understands.
Interpretation is also defined as the recognition of radiographic errors such as overlapping contacts, elongation, foreshortening, movement, normal and some abnormal developmental anatomies.

141
Q

diagnosis defined as

A

the determination of the nature and the identification of an abnormal condition or disease
Diagnosis is the ultimate responsibility of the dentist.
More eyes looking, more likely to see caries, etc.

142
Q

full mouth

A

series can be as few as 14 films or as many as 20. Mostly it is 18 films
3 anterior maxillary
3 anterior mandibular
2 posterior in each of 4 quadrants for 8 all together
4 BW’s

143
Q

the purpose of periapical examination

A

The purpose of the periapical examination is to view the entire tooth and surrounding bone.

144
Q

Periapical (PA) shows the entire tooth and should show at least

A

least 2 mm past the apex of the surrounding bone- bisecting or paralleling techniques may be used

145
Q

Occlusal radiographs show

A

larger areas especially the floor of the mouth—a modification of the bisecting technique is used

146
Q

in paralleing technique the film is

A

placed parallel to the long axis of the tooth

147
Q

Since the structures in the mouth prevent parallel placement against the tooth, the film has to be placed

A

further away from the tooth so the object-film distance is increased so target-film should be increased

148
Q

points of entry on face

A

Anterior centrals- tip of the nose
Canine- ala of the nose
Premolars below the pupil of the eye
Molars- the outer canthus of the eye

149
Q

angulation

A

Angulation is the angle of alignment between the tubehead and the PID
HORIZONTAL ANGULATION—determines if the x-rays pass through interproximally. Overlapping teeth on the radiograph is poor angulation or extremely crooked teeth

150
Q

more angulation

A

VERTICAL ANGULATION– PID and the tubehead are parallel to the floor the angle is zero
When the PID is pointed upward that is a negative angulation and pointed downward is positive

151
Q

more more angulation

A

Excessive vertical angulation foreshortens the picture; Too little angulation elongates.
With XCP-excessive-lose portion of the crown
Too little angulation-lose apex

152
Q

usually

A

Usually the anterior has vertical film placement and posterior has horizontal film placement
BUT if better bone loss levels are desired vertical posterior may be taken

153
Q

bisecting

A

that 2 triangles having equal angles and a common side are equal triangles
Paralleling states that a right angle technique should be used because of less chance of operator error and uses shadow casting rules

154
Q

shadow casting rules

A

Use smallest focal spot possible
Object should be as far as practical from the source of radiation
Object and film should be as close as possible to each other
Object and film be parallel to each other
Radiation must strike the object and film at right angles

155
Q

principles of bisecting

A

Very helpful in children and adults with shallow palates, tori, or edentulous
Page 139, Figure 12-2 shows bisector line
To bisect you must look at the angle formed by the long axis of the tooth and the film. Imagine a line between and this is the bisector line
Place the PID to right angles to the bisector line

156
Q

normally for bitewings the film is placed

A

placed horizontally. The main purpose for BW’s is to diagnose interproximal caries but they are also very helpful for determining bone level.

157
Q

premolar bite wing should

A

SHOW THE DISTAL OF THE CANINE AND OPEN ALL CONTACTS BUT ESPECIALLY THE PREMOLAR CONTACTS. IT SHOULD ALSO SHOW EQUAL AMOUNTS OF THE CROWN PROTIONS OF BOTH THE MAXILLLARY AND MANDIBULAR TEETH. +10 DEGREES FOR THE PID. THE MOST COMMON MISTAKE IS PLACING THE FILM AND POINTING THE PID AT ZERO DEGREES. +10 MEANS THE PID IS POINTED SLIGHTLY DOWNWARD NOT EVEN.

158
Q

molar bitewing should

A

SHOW THE MOLAR CONTACTS OPEN
+10 DEGREES FOR THE PID
THE TEETH SHOULD BE TOGETHER ON THE BITEBLOCK OR BITETAB. WHEN THE TEETH ARE NOT TOGETHER, YOU WILL NOT HAVE THE BONE LEVEL IN THE PICTURE

159
Q

quality assurance

A

REFERENCE FILM-A FILM PROCESSED UNDER IDEAL CIRCUMSTANCES. A FILM IS RUN EACH MORNING AND CHECKED AGAINST THE REFERENCE FILM TO CHECK THE PROCESSING CHEMISTRY

160
Q

coint test

A

THE PURPOSE OF THE COIN TEST IS TO TEST THE DARKROOM LIGHT.
AFTER EXPOSING A #2 FILM AT THE LOWEST POSSIBLE SETTING ON THE COUNTERTOP, TAKE IT TO THE DARKROOM AND OPEN THE FILM AND PLACE ON A PAPER TOWEL. LAY A COIN ON THE FILM FOR TWO MINUTES IN THE DARKROOM WITH ONLY THE DARKROOM LIGHT ON. THEN PROCESS THE FILM NORMALLY.

161
Q

film fog test

A

ANY TIME A NEW BOX OF FILM IS OPENED, A SAMPLE FILM SHOULD BE TAKEN TO TEST THE FILM FOR FOG BEFORE USING WITH A PATIENT.

162
Q

beam alignment test

A

THE PURPOSE OF THIS ACTIVITY IS TO DETERMINE THE SIZE AND ALIGNMENT OF THE PRIMARY BEAM.
(PRETTY MUCH SET AND TESTED WHEN X-RAY MACHINE IS INSTALLED, NOW)

163
Q

unit output test

A

THE PURPOSE IS TO EVALUATE THE DENTAL X-RAY UNIT FOR CONSISTENCY OF RADIATION OUTPUT.
THIS IS THE STEPWEDGE TEST

164
Q

ma caibration testq

A

THE PURPOSE IS TO EVALUATE THE RADIATION OUTPUT AS CONTROLLED BY THE MILLIAMPERAGE SETTING. THIS IS ASSUMING THE MACHINE HAS A MILLIAMPERAGE SETTING AND IS NOT PRESET IN THE MACHINE

radiology exam 2 (1 decks)

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