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Flashcards in Final SG Deck (67)
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1

foreshortening

excessive (too much) vertical angulation

2

how incorrect film packet placement happens

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

3

how to correct incorrect film packet placement

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.

4

bending of upper edge of film against palate

most of the distortion will be localized to bend area

5

elongation because of

improper vertical angulation

6

a carious lesion has

jagged margins

7

a composite has

a definite cut

8

erupting teeth

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

9

external resorption starts

from outside in

10

mylohyoid ridge/line is

posterior extension of mental ridge

11

lingual nerve transverse

lingual foramen

12

submandibular fossa houses

submandibular salivary gland

13

alveolar crest typically appears _____ below cementoenamel junction

1.5 to 2mm

14

PDL space appears as

a thing radiolucent line around root of tooth

15

incorrect horizontal angulation results in

overlapped contact areas

16

no apices are seen

improper placement of film packet

17

improper placement

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

18

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

too steep (excessive)

19

if vertical angulation is too steep (excessive)

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

20

how to correct if image is foreshortened

increase vertical angulation

21

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

too flat (insufficient)

22

if vertical angulation is too flat (insufficient)

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

23

how to correct if image is elongated

decrease vertical angulation

24

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

is not properly aligned with periapical beam alignment device

25

a cone cut is seen as

a curved unexposed (clear) area on radiograph

26

overlapped interproximal contacts result from

incorrect horizontal angulation

27

incorrect vertical angulation causes images

to appear distorted

28

vertical BW angulation

+10 degrees

29

horizontal BW angulation

+20 to 30 degrees

30

what makes rampant caries

greater than 3 areas in mouth

31

cone cut is seen when PID

is not properly aligned with bitewing beam alignment device

32

bent film results in

distorted or elongated image

33

bent film appearance

images appear stretched and distorted

34

bent film cause

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

35

bent film correction

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

film crease is seen as

a thin radiolucent line on radiograph

37

film crease cause

film creased and emulsion cracked

38

to correct film creasing

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

39

double exposure cause

same receptor exposed twice in patient's mouth.

40

result of double exposure

double image seen on radiograph

41

correction of double exposure

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

42

movement results in

a blurred image

43

movement appearance

blurred images seen on radiograph

44

movement cause

either tubehead or patient moved during exposure of receptor

45

movement correction

stabilize tubehead and patient's head before exposing receptor. instruct patient to remain still but don't say "don't move"

46

reversed film causes image

that appears light with a herringbone pattern

47

too much vertical angulation results in images that are

foreshortened

48

too little vertical angulation results in images that are

elongated

49

incorrect horizontal angulation results in images that are

overlapped

50

what errors can occur with bitewing technique

elongation
overlapped contacts
cone cut

51

what errors can occur with bisecting technique

elongation
overlapped contacts
cone cut
phalangioma

52

hole or opening in bone

canal

53

broad, shallow depression in bone

foramen

54

cavity, recess, or hollow space in bone

fossa

55

passageweay through bone

sinus

56

spongelike bone

cancellous

57

cancellous is also known as

trebeculae

58

bony partition that separates two spaces

septum

59

immovebale joint between bones

suture

60

hard or compact bone

cortical

61

root canal treatments are filled with

gutta percha

62

Cervical burnout

Radiolucency on both sides of cervical region

63

CEJ

enamel forms first, then cementum meets enamel
cementum overlaps enamel

64

alveolar bone proper

lamina dura radiographically
lines the tooth socket

65

what makes inverted y

when border of nasal fossa and border of maxillary sinus meet

66

coronoid process is visible

in maxillary molar PA

67

lingual foramen is

apical to 24&25