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Flashcards in Occlusion 1 Deck (26)
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1

What muscles are involved in mandibular movement?

1. Muscles of Mastication
- Involved in depression, elevation + lateral movements of the mandible

2. Suprahyoid Muscles
- Elevate the hyoid bone or depress the mandible

2

List the muscles of mastication (4)

1. Temporalis

2. Lateral Pteryogid

3. Medial pterygoid

4. Masseter

3

Function of temporalis

Elevates + retracts mandible

Assists in rotation

4

Function of lateral pterygoid

- Lateral movement + protrusion + depression

5

Function of medial pterygoid

- Elevates mandible
- Lateral movement + protrusion

6

Function of the masseter

- Elevates + protracts the mandible
- Assists in lateral movement

7

What are the 2 main mandibular movements?

1. Rotation

2. Translation:
- Lateral translation

8

Occlusal vertical dimension

Teeth clenched together

9

Resting vertical dimension

Resting position of TMJ
- Mouth slightly open, lips together and teeth not in contact

10

What type of movements occur in rotation?

Hinge movements
- Rotation of the condylar heads

11

Function of a facebow (2)

Recording relationship of maxilla to:

1. Terminal hinge axis

2. Distance between the condyles

12

Translation of the condyle steps (4)

1. Lateral pterygoid contracts
2. Articular disc + condyle begin to move
3. Travels downwards + forwards along the incline of the articular eminence
4. May also travel laterally (laterotrusive movement)

13

What does posselts envelope show? (3)

Border movements of the mandible in the:

1. Frontal plane
2. Sagittal plane
3. Horizontal plane

14

What do the:
1. Letters
2. Lines

In Posselts Envelope relate to?

1. Letters
- Tooth positions

2. lines
- Jaw position

15

What does:

ICP
E
PR
T
R
RCP

Stand for

ICP - Intercuspal position

E - Edge to edge

PR - Protrusion

T - Maximum opening

R - Retruded axis position

RCP - Retruded contact position

16

What is ICP? (3)

- Comfortable bite
- Max interdigitation of teeth
- Can be called centric occlusion

17

What is edge to edge? (2)

- Teeth slide forward from ICP guiding on palatal surfaces of anterior teeth

- Incisal edges of upper and lower incisors touch

18

If edge to edge and theres space between posteriors what does this mean?

Anterior guidance

19

If edge to edge and theres no space between posteriors

Grouped function

20

What is protrusion?

- Condyle moves forwards and downwards on articular eminence

21

Tooth contacts in protrusion (3)

- Only incisors +/- canines
- No posterior tooth contacts
- Eventually no tooth contacts

22

What is maximum opening? (3)

- No tooth contacts

- Mouth wide open

- Full translation of condyle over the articular eminence

23

What is retruded axis position? (3)

1. No tooth contacts
2. In the most superior anterior position of the condylar head in the fossa
3. Terminal hinge axis

24

What is retruded contact position?

First tooth contact from retruded arch of closure

25

What position do we aim to make most restorations in?

ICP

26

What 2 sides make up lateral translation?

1. Working side
- The side the mandible moves to

2. Non-working side