Bisected Angle And Occlusal Views

Question 1

Describe the technique of bisected angle?

Answer 1

Film placed as close to tooth as possible
Observe angulation of long angle of tooth and angulation of film
Bisect angle of two
Aim beam at 90 degrees to bisected angle line

Question 2

What happens if angulation too flat?

Answer 2

Tooth appears elongated

Question 3

What happens if angulation too steep

Answer 3

Tooth appears shortened

Question 4

What are the benefits of bisected angle holder

Answer 4

Avoids irradiating finger
Aids visualising angulations
Reduces film bending
Stabilises film

Question 5

What do occlusal radiographs demonstrate?

Answer 5

In erupted teeth
Supernumerary teeth
Cysts

Question 6

What technique is used for occlusal radiographs?

Answer 6

Modified bisected angle technique

Question 7

Describe occlusal film positioning technique

Answer 7

Film placed in mouth. Occlusal place horizontal
Insert film as far as tolerable
White side of film towards area to be images
Beam angled appropriately

Question 8

Describe angulation of beam for maxilla

Answer 8

60-70 degrees lateral oblique

65 degrees anterior oblique

Question 9

Describe the angulation re. Mandibular occlusal films

Answer 9

45 degrees anterior and lateral oblique

Question 10

Describe angulation for true occlusal mandible

Answer 10

90degrees

Question 11

Why use bisected angle?

Answer 11

Change position or shape of tooth
Where access is difficult
If patient can’t tolerate holders