Panoramic

Question 1

linear tomography

Answer 1

xray source moves in one direction while receptor goes opposite

focal slice remains projected and appear clearly
areas outside of this will be spread out [focal trough]

Question 2

orthogonal program
adv/disadv

Answer 2

optimal view of dentition, angulation changed to be closer to 90 degrees of teeth

a = reduces teeth overlap, more accurate bone loss

d= distorts skeleton, narrow field of view

Question 3

benefits vs downfalls of panoramics

Answer 3

b
captures entire dentition, imaging of non-dental areas
lack of intraoral holder

d
worse clarity [lower spatial resolution, more superimposition]
longer exposure time
increased risk of pt moving
higher radiation dose per image [5x]

Question 4

advice to give to pt when getting panoramic

Answer 4

remove metal foreign bodies
position in machine
stay still
dont talk or swallow
tongue at roof of mouth

Question 5

explain bite peg and light beam markers

Answer 5

bite peg - edge to edge occlusion with both arches in focal trough

light beam markers -
horizontal line matches frankfort plane
vertical midline matches mid-saggital plane
canine lines match maxillary canines

Question 6

what is a focal trough

Answer 6

specific area within the patient’s anatomy where the dental arches and surrounding structures are in focus and captured sharply on the panoramic radiograph

where xray converges

Question 7

which external reference plane of pt should you position horizontally when setting up for panoramic radiograph

Answer 7

frankfort horizontal plane

external acoustic meatus to infraorbital rim