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Radiology > Final SG > Flashcards

Final SG Flashcards

1
Q

foreshortening

A

excessive (too much) vertical angulation

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2
Q

how incorrect film packet placement happens

A

operator placed bite block at least 1cm above occlusal surface of mandibular teeth

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3
Q

how to correct incorrect film packet placement

A

instrument and image receptor may be angled and tongue gently displaced to allow bite block to rest against teeth of interest before patient closes
also can place cotton roll on opposite surface.

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4
Q

bending of upper edge of film against palate

A

most of the distortion will be localized to bend area

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5
Q

elongation because of

A

improper vertical angulation

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6
Q

a carious lesion has

A

jagged margins

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7
Q

a composite has

A

a definite cut

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8
Q

erupting teeth

A

primary teeth undergoing external resorption due to eruptive force of permanent teeth

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9
Q

external resorption starts

A

from outside in

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10
Q

mylohyoid ridge/line is

A

posterior extension of mental ridge

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11
Q

lingual nerve transverse

A

lingual foramen

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12
Q

submandibular fossa houses

A

submandibular salivary gland

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13
Q

alveolar crest typically appears _____ below cementoenamel junction

A

1.5 to 2mm

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14
Q

PDL space appears as

A

a thing radiolucent line around root of tooth

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15
Q

incorrect horizontal angulation results in

A

overlapped contact areas

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16
Q

no apices are seen

A

improper placement of film packet

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17
Q

improper placement

A

a dropped corner is seen when edge of receptor is not placed parallel to incisal or occlusal surfaces of teeth

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18
Q

if vertical angulation is _______, image of tooth on receptor is shorter than actual tooth; images are foreshortened

A

too steep (excessive)

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19
Q

if vertical angulation is too steep (excessive)

A

the image of the tooth on receptor is shorter than actual tooth; images are foreshortened

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20
Q

how to correct if image is foreshortened

A

increase vertical angulation

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21
Q

if vertical angulation is ______, the image of tooth on receptor is longer than actual tooth; images are elongated

A

too flat (insufficient)

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22
Q

if vertical angulation is too flat (insufficient)

A

the image of tooth on receptor is longer than actual tooth; images are elongated

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23
Q

how to correct if image is elongated

A

decrease vertical angulation

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24
Q

a cone cut is seen when the position indicating device (PID)

A

is not properly aligned with periapical beam alignment device

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25
Q

a cone cut is seen as

A

a curved unexposed (clear) area on radiograph

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26
Q

overlapped interproximal contacts result from

A

incorrect horizontal angulation

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27
Q

incorrect vertical angulation causes images

A

to appear distorted

28
Q

vertical BW angulation

A

+10 degrees

29
Q

horizontal BW angulation

A

+20 to 30 degrees

30
Q

what makes rampant caries

A

greater than 3 areas in mouth

31
Q

cone cut is seen when PID

A

is not properly aligned with bitewing beam alignment device

32
Q

bent film results in

A

distorted or elongated image

33
Q

bent film appearance

A

images appear stretched and distorted

34
Q

bent film cause

A

film bent excessively b/c of curvature of patient’s hard palate. As result, stretched and distorted images seen on radiograph

35
Q

bent film correction

A

check film placement before exposure

if film bent b/c of curvature of hard palate, cotton rolls can be used with paralleling technique or bisecting technique

36
Q

film crease is seen as

A

a thin radiolucent line on radiograph

37
Q

film crease cause

A

film creased and emulsion cracked

38
Q

to correct film creasing

A

do not bend or crease film excessively. instead, gently soften corners of film before placing in patient’s mouth

39
Q

double exposure cause

A

same receptor exposed twice in patient’s mouth.

40
Q

result of double exposure

A

double image seen on radiograph

41
Q

correction of double exposure

A

always separate exposed and unexposed receptors. once receptor has been exposed, place in designated area

42
Q

movement results in

A

a blurred image

43
Q

movement appearance

A

blurred images seen on radiograph

44
Q

movement cause

A

either tubehead or patient moved during exposure of receptor

45
Q

movement correction

A

stabilize tubehead and patient’s head before exposing receptor. instruct patient to remain still but don’t say “don’t move”

46
Q

reversed film causes image

A

that appears light with a herringbone pattern

47
Q

too much vertical angulation results in images that are

A

foreshortened

48
Q

too little vertical angulation results in images that are

A

elongated

49
Q

incorrect horizontal angulation results in images that are

A

overlapped

50
Q

what errors can occur with bitewing technique

A

elongation
overlapped contacts
cone cut

51
Q

what errors can occur with bisecting technique

A

elongation
overlapped contacts
cone cut
phalangioma

52
Q

hole or opening in bone

A

canal

53
Q

broad, shallow depression in bone

A

foramen

54
Q

cavity, recess, or hollow space in bone

A

fossa

55
Q

passageweay through bone

A

sinus

56
Q

spongelike bone

A

cancellous

57
Q

cancellous is also known as

A

trebeculae

58
Q

bony partition that separates two spaces

A

septum

59
Q

immovebale joint between bones

A

suture

60
Q

hard or compact bone

A

cortical

61
Q

root canal treatments are filled with

A

gutta percha

62
Q

Cervical burnout

A

Radiolucency on both sides of cervical region

63
Q

CEJ

A

enamel forms first, then cementum meets enamel

cementum overlaps enamel

64
Q

alveolar bone proper

A

lamina dura radiographically

lines the tooth socket

65
Q

what makes inverted y

A

when border of nasal fossa and border of maxillary sinus meet

66
Q

coronoid process is visible

A

in maxillary molar PA

67
Q

lingual foramen is

A

apical to 24&25

Radiology (6 decks)

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