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4 Radiology > Techniques 1 > Flashcards

Techniques 1 Flashcards

1
Q

name 3 types of intra-oral radiographs

A

peri-apical
bitewing
occlusal

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2
Q

what can u see in a peri-apical?

A

See from crown to root of teeth

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3
Q

what can u see in a horizontal bitewing?

A

from distal edge of 4 to mesial edge of 8, need to see the bone levels but not the whole root

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4
Q

what can u see in a vertical bitewing compared to horizontal?

A

more of the bone but still not the entire root

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5
Q

what can u see in a maxillary occlusal radiograph?

A

Anterior part of maxilla and anterior teeth

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6
Q

what can u see in a mandibular occlusal radiograph?

A

Tooth bearing portion of the mandible and the floor of the mouth

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7
Q

name this extra-oral radiograph

A

Lateral cephalogram

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8
Q

name this extra-oral radiograph

A

Postero-anterior mandible

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9
Q

name this extra-oral radiograph

A

Lateral oblique mandible

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10
Q

name this extra-oral radiograph

A

Occipito-mental views of facial bones

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11
Q

what happens to the detail of the image the closer the receptor is to the object?

A

better detail of image

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12
Q

radiographs are used to detect/asses

Apical infection/inflammation

Periodontal problems

Trauma - fractures to tooth or surrounding bone

Tooth morphology pre-extraction

Endodontics (RCT)

Evaluation of implants

tooth development

A
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13
Q

name 2 radiographic techniques

A

paralleling technique

bisected angle technique

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14
Q

name this intra- oral radiographic technique

A

paralleling technique

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15
Q

? technique

Uses ?

Receptor ? to tooth

X ray beam ? to tooth/receptor

Creates ? and ? image

A

paralleling

holder

parallel

perpendicular

accurate
reproducible

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16
Q

name intra-oral technique

A

bisected angle technique

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17
Q

is the bisected angle technique for intra-oral radiographs the standard technique? why?

A

no
Patient holds film so exposes fingers

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18
Q

when do u use the bisected angle technique for intra-oral radiographs?

A

when a patient cant tolerate a holder in their mouth

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19
Q

which teeth are blue holders used for?

A

anteriors

20
Q

what teeth are yellow holders used for?

A

posteriors

21
Q

what teeth are red holders used for?

A

bitewings

22
Q

what teeth are green holders used for?

A

endodontic procedures

23
Q

what are the 3 structural parts of a holder?

A

Bite block holds the receptor

Indicator arm/rod fits into the bite block

Aiming ring for alignment of the collimator with receptor

24
Q

name two factors that affect image geometry

A

receptor tooth relationship
x-ray tube position

25
Q

Vertical plane of the film parallel to?

A

long axis of the tooth

26
Q

Horizontal plane of the film parallel to?

A

the dental arch

27
Q

if the x-ray tube is angled up what happens to the teeth in the image?

A

elongates teeth

28
Q

if the x-ray tube is anlged down what happens to the teeth?

A

shortens the teeth

29
Q

explain the X-ray source to receptor distance

A

Want to be long so beam can diverge as cone shaped

30
Q

explain the Object (tooth) to receptor distance

A

Want to be short

31
Q

for anteriors the receptor orientation is horizontal or vertical?

A

vertical

32
Q

for posteriors the receptor orientation is horizontal or vertical?

A

horizontal

33
Q

what are some barriers to good positioning? 4

A

Mouth size
Gag reflex
Film size
Digital sensor shape and size

34
Q

what film size do u use for adult anteriors?

A

0 or 1

35
Q

what film size do u use for adult bisecting angles technique?

A

2

36
Q

what film size do u use for adult posteriors?

A

2

37
Q

what film size do u use for adult bitewings?

A

2

38
Q

what film size do u use for child anteriors?

A

0

39
Q

what film size do u use for child deciduous posteriors?

A

0

40
Q

what film size do u use for child permanent posterior teeth?

A

2

41
Q

what film size do u use for child bitewings >10yrs old?

A

2

42
Q

what film size do u use for child bitewings <10yrs old?

A

0 or 1

43
Q

what has caused this?

A

downwards vertical angulation
- shortened teeth
- separated cusps

44
Q

what has caused this?

A

horizontal angulation has caused overlap of teeth

45
Q

what has caused this?

A

upwards vertical angulation
- elongated teeth
- cone beam cutting has

4 Radiology (19 decks)

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