Techniques Flashcards

1
Q

What relationship is key to the quality of an image?

A

x-ray source
object
receptor

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2
Q

what are the 2 intra oral radiographic techniques?

A

bisected angle
paralleling

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3
Q

what is the standard intra oral technique?

A

paralleling

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4
Q

what makes bisected angle easier for patient?

A

no holder required - patient holds film in their mouth

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5
Q

when is bisected angle commonly used?

A

endodontic procedures

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6
Q

how does paralleling create a reproducible image?

A

holder keeps receptor parallel to tooth and x-ray beam
- accurate geometry
- minimises magnification

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7
Q

what are holders made up of?

A

bite block (receptor)
indicator arm/ rod
aiming ring

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8
Q

what are the colours of holders?

A

blue - anterior
yellow - posterior
red - bitewings
green - endo

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9
Q

what is the object that the image is taken on?

A

receptor

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10
Q

what are receptors?

A

phosphor plates which are processed, erased and reused

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11
Q

what type of radiology uses phosphor plates?

A

computed

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12
Q

what are the 4 common sizes of receptors for intraoral?

A

0 1 2 4

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13
Q

position of vertical plane?

A

parallel to long axis of tooth

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14
Q

distortion of vertical plane results in?

A

elongated apex of tooth
roots projected off the top of receptor

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15
Q

horizontal plane positioning?

A

parallel to dental arch

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16
Q

distortion of horizontal plane results in?

A

overlapping

17
Q

position of x-ray beam?

A

right angle to tooth and receptor

18
Q

what happens if x-ray beam too angled up?

A

stretch teeth - elongated

19
Q

what happens if x-ray beam too angled down?

A

foreshorten teeth - short stubby appearance

20
Q

horizontal angulation of x-ray beam causes?

A

overlapping

21
Q

what is the rectangle attachment at the end of the x-ray tube?

A

collimator

22
Q

what does rectangular collimation do?

A

reduce dose to patient by up to 50%

23
Q

what positioning is good magnification?

A

long distance between x-ray source and receptor
short distance between object and receptor

24
Q

where should the dot on the receptor be placed?

A

next to the crown of the tooth
bitewing - next to palate

25
upwards angulation of x-ray beam results in?
elongated teeth
26
downwards angulation of x-ray beam results in?
foreshortened teeth
27
what are bitewings used for?
detect caries monitor caries progression assess periodontal status assess existing restorations
28
what's the dose difference between vertical and horizontal bitewings?
vertical 4 times radiation horizontal 2 times radiation
29
what happens if there are gaps when aligning collimator and guiding ring?
beam will hit receptor at an angle and cause overlap, elongation or foreshorting
30
what are the 2 types of holders?
rigid plastic paper tab
31
when may you use the paper tab holder?
patient cant tolerate plastic