Radiology

Question 1

What types of radiographs require a red Rinn holder?

Answer 1

Bitewings

don’t have to change configuration for left and right

Question 2

What types of radiographs require a blue Rinn holder?

Answer 2

anterior periapicals 
(don't have to change configuration for upper and lower)

Question 3

What types of radiographs require a yellow Rinn holder?

Answer 3

posterior periapicals

Question 4

what size of film do u use for a bitewing?

Answer 4

size 2

Question 5

what size of film do you use for an anterior periapical?

Answer 5

size 0 or 1

Question 6

what size of film do you use for a posterior periapical?

Answer 6

size 2

Question 7

what side of the film packet faces the x-ray machine?

Answer 7

white side

Question 8

when using a yellow rinn holder for posterior periapicals what quadrants can be x-ray’d without changing the configuration of the holder?

Answer 8

Upper right & lower left

upper left & lower right

Question 9

describe how you would set up a yellow rinn holder for an upper right periapical (and lower left)

Answer 9

Hold the metal rod in your right hand with 2 metal prongs facing away from your hands

Slide the bite block on to the prongs

attach the ring with the true square side first on to the metal rod

White dot should be ….

Question 10

Where should the white dot be located for a anterior periapical using blue Rinn holder?

Answer 10

At the bottom and should be on the corner that goes into the bite block first

Question 11

Where should the white dot be located for a bitewing using red Rinn holder?

Answer 11

with the film packet horizontal it should be At the top towards the palate

Question 12

Where should the white dot be located for a posterior periapical using yellow Rinn holder?

Answer 12

……

Question 13

what does the dose of the x-ray depend on? (4)

Answer 13

Size and build of the patient

number & spacing of the teeth

the tooth/teeth being radiographed

x-ray unit being used

Question 14

Describe how you set up the collimator head in relation to the patient/Rinn holders (3)

Answer 14

Push the ring close to the patient’s face but not touching

Ensure the rotation of collimator head matches the grooves on the Ring of the Rinn holder
(there’s a vertical groove for PA’s and a horizontal groove)

Ensure the line on the collimator head is parallel to the metal rod of the rinn holder - assess from the front

Question 15

Describe the set up for an occlusal radiograph. (5)

Answer 15

Have patient in the correct position

No holder required - ask patient to gently bite down on the occlusal film packet with white side facing the x-ray source

ensure dot is facing up and is out of the mouth

ensure vertical angulation is 60 degrees downwards

place tube head above the bridge of nose

Question 16

when do you know to stop pressing the exposure button?

Answer 16

when the warning sound stops

Question 17

what is patient position for occlusal radiographs? (3)

Answer 17

ala-tragus line and maxillary occlusal plane parallel to the floor

Midsagittal plane perpendicular to the floor

Interpupillary line parallel to the floor

Question 18

What must you ask the patient before taking an OPT? (3)

Answer 18

DOB
ADDRESS
had an opt recently/elsewhere

Question 19

what must the patient remove before an OPT? (6)

Answer 19

Outdoor jackets 
jewellery - earrings 
hearing aids 
removable appliances in mouth 
hair accessories 

• ensure no bulky hair styles

Question 20

Describe how the patient should be positioned for an OPT (6)

Answer 20

(adjust the height so its a little higher than required)

get patient to;
stand upright with straight neck

place chin on the chin rest

Feet slightly apart

hands on the handles

and bite the peg at the groove with upper and lower front teeth

ask patient to stay still and push tongue up on to the roof of their mouth.

Question 21

Describe the machine position (superimposed lines) 3

Answer 21

Ensure the vertical line is down the middle of the face

the horizontal line is along the Frankfort plane

ensure the canine line is superimposed on to the canine