Lecture 4

Question 1

Why should we take pre-op radiographs?

Answer 1

To assess the chance of jaw fracture and tell the owner before we go ahead with the procedure. Also to see tooth pathology, fractures and direction of roots.

Question 2

Have many views should we do for dogs and cats?

Answer 2

Dogs - 10

Cats - 6

Question 3

Explain the bisecting angle technique (BAT)?

Answer 3

Rule of thumb: aim x-ray collimator at 90 degrees to film and then drop 20-30 degrees from vertical
For cats it is 25 degrees from the vertical angle

Question 4

Explain what is wrong with the angle of the radiograph is the teeth appear too long or shot?

Answer 4

Long = too horizontal with angle
Short = too vertical with angle

Question 5

What technique can we use to prevent superimposition of the nasal cavity of the teeth?

Answer 5

Take a mediolateral view to assess apical pathology allows you to see the apex of the tooth over the nasal cavity

Question 6

What is the modified BAT for looking at the maxillary PM4 in cats?

Answer 6

shift the tube head so it is more horizontal (30 degrees above the horizontal) causes elongation of the tooth roots but the zygoma is now out of the way

Question 7

What do you do when you get 2 mesial roots superimposed on one another?

Answer 7

In this scenario you don’t know which root is in-front of the other. Do 2 views the lateral to tube shift will go rostral and the medial to the tube shift will go caudal.
This view is called the tube shift rule or same lingual opposite buccal (SLBO)