Toothwear and Occlusion Flashcards Preview

CDS: Restorative Dentistry > Toothwear and Occlusion > Flashcards

Flashcards in Toothwear and Occlusion Deck (32)
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1

Define "occlusion"

The study of the relationship between the upper and lower teeth when they are close together

2

What is the functional purpose of occlusion?

The functional purpose of bringing the teeth together is for chewing and swallowing

3

Which muscles are important for occlusion?

Temporalis, Masseter, Pterygoid muscles

4

What is the purpose of the muscles of mastication?

To move the jaws into position to allow the teeth to contact

5

Which position is the mandible in when the teeth are apart?

Rest position

6

Which position is the mandible in when there is maximal inter-cuspation of the teeth?

Intercuspal Position (ICP)

7

What is the intercuspal position (ICP)?

The position in which the teeth are maximally meshed together
It is the position the mandible aims for at the end of chewing.
Provides maximal stability for the teeth and the jaws

8

Describe the contact points of posterior teeth when the mandible is in the intercuspal position

The lower buccal cusps and upper palatal cusps occlude against the fossae and marginal ridges of the occluding teeth

9

Describe the contact points of the anterior teeth when the mandible is in the intercuspal position

The lower incisal edges and canine tips occlude against the cingulum area of the opposing teeth

10

Where are forces directed in teeth in ideal occlusal contacts?

Down the long axis of teeth

11

What can we use to assess suspected ICP?

Shimstock
Place the shimstock between opposing teeth and ask patient to bite down.
If the teeth are in ideal occlusion, should not be able to remove the shimstock.

12

How thick is shimstock?

10 microns

13

What is the purpose of articulating paper?

To assess the occlusion intra-orally.

14

Describe the features of a balanced occlusion

- Even, bilateral contacts in the ICP
- Anterior teeth contact evenly when the mandible protrudes
- Contact with teeth in the opposing arch
- Contact with adjacent teeth in the opposing arch

15

Describe the components of the temporomandibular joint

The head of condoyle fits into the mandibular fossa of the temporal bone

16

What happens to the head of condoyle during protrusion of the mandible?

The head of condoyle translates downwards and forwards in the mandibular fossa

17

How is "guidance" studied?

By observing movement of the mandible from ICP "outwards"

18

Describe group function

When the mandible swings laterally and there are several teeth contacting

19

What is canine guidance also known as?

Posterior discussion

20

Describe canine guidance

When the mandible moves laterally with the tips of the canines being the only teeth in the arch which are touching

21

What is an articulator and what can it be used for?

- A device in which dental casts are help in relationship to each other
- Can be used to replicate mandibular movements

22

Define "attrition"

- The loss of tooth substance caused by contact between occluding surfaces
- Caused by parafunctional rather than functional activity

23

Define "parafunction"

Purposeless clenching or grinding of the teeth (bruxism)

24

Define "erosion"

The loss of tooth substance by a chemical process (acid) not involving bacterial action

25

Define "abrasion"

Loss of tooth substance cased by abnormal rubbing from a non-dental object. Most commonly caused by a toothbrush

26

What is toothier often due to?

A combination of attrition, erosion and abrasion

27

What does translation mean in relation to movement of the jaw?

Downwards and forwards

28

What is the purpose of restorations in teeth?

Replace lost tooth tissue and to "restore" form, function and appearance

29

Why may restorations fail?

- Secondary (recurrent) caries
- Fracture of the restoration or tooth
- Pulp death
- Incompatibility with periodontal tissues
- Poor appearance

30

What can poorly fitting crown margins be associated with?

Gingivitis