Imaging DCT

Question 1

What are examples of plain RADs?

Answer 1

IO - BWs/ PAs/ USO etc
OPT
PA mandible

Question 2

What are indications of OPT?

Answer 2

Imaging mandible - fractures/ cysts
Wisdom teeth
Salivary calculi - submandibular gland
TMJ - limited use

Question 3

What are limitations of OPG?

Answer 3

Pt must be able to stand still 15-20 secs
Anterior teeth not well visualised due to imposition C-spine

Question 4

What is dose OPG?

Answer 4

2.7-39 microsievrts

Question 5

What image is often taken in combination w/ OPG

Answer 5

PA mandible

Question 6

When is a lateral ceph used?

Answer 6

To show relationship between teeth and jaws
LeFort fractures
Orthognathic surgeries
View pterygoid plates

Question 7

Limitations of lateral ceph?

Answer 7

Errors can be made in tracing

Question 8

What is dose of a lateral ceph?

Answer 8

2.2-14 microsieverts

Question 9

What are benefits of upper/ lower standard occlusal?

Answer 9

Help see anterior teeth - fractures/ developmental abnormalities
Avoid superimposition C spine

Question 10

What should be used if taking occlusal views?

Answer 10

Protective thyroid sheild

Question 11

When are PA mandibles used?

Answer 11

Mandibular fractures

Question 12

What are PA mandibles used in combination with?

Answer 12

OPT

Question 13

When are CT scans used?

Answer 13

Complex facial fractures, cysts, H&N cancer

Question 14

Benefit of CBCT?

Answer 14

Lower dose - can be used for smaller area

Question 15

Indications CBCT?

Answer 15

Wisdom teeth and ID nerve, pathology - cyst, implants

Question 16

When is MRI used?

Answer 16

For soft tissue structures

Question 17

Benefit of MRI

Answer 17

No radaiation - can be repeated

Question 18

Limitations of MRI

Answer 18

30-40 mins
Claustrophobic pt
Pt w. implanted metal

Question 19

Common indication MRI in dental?

Answer 19

TMJ pathology - look disc position on opening/ closing