Techniques

Question 1

What relationship is key to the quality of an image?

Answer 1

x-ray source
object
receptor

Question 2

what are the 2 intra oral radiographic techniques?

Answer 2

bisected angle
paralleling

Question 3

what is the standard intra oral technique?

Answer 3

paralleling

Question 4

what makes bisected angle easier for patient?

Answer 4

no holder required - patient holds film in their mouth

Question 5

when is bisected angle commonly used?

Answer 5

endodontic procedures

Question 6

how does paralleling create a reproducible image?

Answer 6

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

Question 7

what are holders made up of?

Answer 7

bite block (receptor)
indicator arm/ rod
aiming ring

Question 8

what are the colours of holders?

Answer 8

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

Question 9

what is the object that the image is taken on?

Answer 9

receptor

Question 10

what are receptors?

Answer 10

phosphor plates which are processed, erased and reused

Question 11

what type of radiology uses phosphor plates?

Answer 11

computed

Question 12

what are the 4 common sizes of receptors for intraoral?

Answer 12

0 1 2 4

Question 13

position of vertical plane?

Answer 13

parallel to long axis of tooth

Question 14

distortion of vertical plane results in?

Answer 14

elongated apex of tooth
roots projected off the top of receptor

Question 15

horizontal plane positioning?

Answer 15

parallel to dental arch

Question 16

distortion of horizontal plane results in?

Answer 16

overlapping

Question 17

position of x-ray beam?

Answer 17

right angle to tooth and receptor

Question 18

what happens if x-ray beam too angled up?

Answer 18

stretch teeth - elongated

Question 19

what happens if x-ray beam too angled down?

Answer 19

foreshorten teeth - short stubby appearance

Question 20

horizontal angulation of x-ray beam causes?

Answer 20

overlapping

Question 21

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

Answer 21

collimator

Question 22

what does rectangular collimation do?

Answer 22

reduce dose to patient by up to 50%

Question 23

what positioning is good magnification?

Answer 23

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

Question 24

where should the dot on the receptor be placed?

Answer 24

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

Question 25

upwards angulation of x-ray beam results in?

Answer 25

elongated teeth

Question 26

downwards angulation of x-ray beam results in?

Answer 26

foreshortened teeth

Question 27

what are bitewings used for?

Answer 27

detect caries
monitor caries progression
assess periodontal status
assess existing restorations

Question 28

what’s the dose difference between vertical and horizontal bitewings?

Answer 28

vertical 4 times radiation
horizontal 2 times radiation

Question 29

what happens if there are gaps when aligning collimator and guiding ring?

Answer 29

beam will hit receptor at an angle and cause overlap, elongation or foreshorting

Question 30

what are the 2 types of holders?

Answer 30

rigid plastic
paper tab

Question 31

when may you use the paper tab holder?

Answer 31

patient cant tolerate plastic