Occlusion - considerations 1

Question 1

What is a stable occlusion?

Answer 1

One in which occlusal contacts help limit the possibility of tooth movement (drifting, tipping and over eruption). There are also no ongoing active processes likely to lead to tooth movement.

Question 2

What are 3 possible ways in which an occlusion can become unstable?

Answer 2

Ex
Periodontitis
Orthodontic treatment

Question 3

How do the cusps come into contact when in ICP?

Answer 3

the upper palatal cusps on the molars occlude the fossa of the lower molars.
Then buccal cusps of the lower molars occlude with the fossas of the upper molars

Question 4

What are 2 benefits of ICP?

Answer 4

The tooth is more stable

Forces are directed down the long axis of the tooth.

Question 5

What are two unfavourable contacts

Answer 5

Cusp contact tip to tip

no contact at all

Question 6

Mandible movement during chewing is described in terms of working and non-working sides. Describe the working side and what it looks like?

Answer 6

The food bolus is one this side
The mandible moves to this side
TMJ on this side makes rotation movement

Question 7

Describe the non-working side?

Answer 7

The food bolus isn’t on this side
The mandible moves in the opposite direction.
The TMJ performs a translation movement. The head of the condyle moves down at a 45-degree angle towards the articular eminence

Question 8

What is bennet’s angle?

Answer 8

This is the angle between the sagittal plane and the horizontal plane from which the condyle advances during lateral movement of the mandible.

Question 9

What is bennet’s angle usually?

Answer 9

10 degrees

Question 10

What are the 3 types of guidance?

Answer 10

Canine guidance 
Group function
Balanced articulation (only for full denture patients)

Question 11

Why do full denture patients get balanced articulation?

Answer 11

Due to the fact that if there was one area of guidance placed then the denture would be easily dislodged.

Question 12

When restoring teeth, canine guidance is prefered, why is this?

Answer 12

Easier to recreate
Protects the posterior teeth and posterior restorations more
Doesn’t strain the M.O.M as much

Question 13

If a patient has non-working side contacts what may they present with?

Answer 13

Shooting pains

Question 14

What are some examples of parafunction?

Answer 14

Bruxism
clenching
Protective neuromuscular reflexes dont operate.

Question 15

What can parafunction cause?

Answer 15

Damage to teeth, periodontium, muscles and joints

Question 16

When performing any restoration, what must be considered in terms of parafunction?

Answer 16

The patient’s parafunction habits must be considered and factored into the design.
So that the design can withstand these forces.

Question 17

When is a facebow used?

Answer 17

When reorganising the occlusion

Any time canines are restored or altered

Question 18

How can you examine a patients occlusion clinically?

Answer 18

Articulating paper
Mount casts onto articulator (out of mouth)
Shimstock paper

Question 19

How thick is articulating paper?

Answer 19

20microns

Question 20

What is shimstock paper and how is it used?

Answer 20

Get patient to bite down and if you can’t remove it then there is a contact present. 12microns thick