Notes

Question 0

Periapical film

Answer 0

Used to show the root apex of the tooth and the surrounding structure

Question 1

Radiology

Answer 1

Study of x-radiation for diagnostic purposes

Question 2

Bite wing

Answer 2

To detect inter proximal decay and to determine the height of the alveolar crest of bone

Question 3

Occlusal film

Answer 3

Can view a cross section of the teeth and the complete palatal structure or floor of the mouth

Question 4

Review patients radiological history

Answer 4

Always ask how long and how many

Question 5

Horizontal angulation

Answer 5

Central ray must pass through the teeth parallel to the angle of the arch of the teeth to be exposed

Question 6

Vertical angulation too low?

Answer 6

Elongation

Question 7

Vertical angulation too high?

Answer 7

Foreshortening

Question 8

Conditions for most accurate image:

Answer 8

1) tooth must be parallel and as close to the film as possible
2) the source of X-rays must be small and as far from the tooth as possible
3) radiation must strike the object and film at right angle

Question 9

If central ray not parallel to teeth…

Answer 9

Resultant image is overlapping and can’t detect inter proximal caries

Question 10

Which cones rays are more divergent?

Answer 10

Short cone

Question 11

Safety precautions (6)

Answer 11

Never hold film in patients mouth 
Stand behind protective barrier 
Or stand at least 6' away from unit 
Never stand in direct line of primary beam 
Do not use a pointed cone
Use lead lined open ended come

Question 12

Paralleling technique (long cone)

Answer 12

Long axis tooth and film are parallel to each other
Central ray is directed perpendicular to the long axis tooth and the film
(Produces most accurate image of the teeth because tooth and film are parallel)

Question 13

Vertical Angulation

Answer 13

Up and down angulation of the cone