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BDS4 > Occlusion 1 > Flashcards

Occlusion 1 Flashcards

1
Q

TMJ anatomy

A

Starting from right:
Articular eminence
Superior head of lateral pterygoid
Inferior head of lateral pterygoid
Condylar head
Retrodiscal tissue
Inferior synovial cavity
Articulator disc
Superior synovial cavity
Mandibular fossa

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2
Q

What do muscles of mastication do?

A

Depression, elevation and lateral movements of mandible

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3
Q

What do suprahyoid muscles do

A

Elevate hyoid bone or depress mandible

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4
Q

Examples of MoM

A

Temporalis
Lateral pterygoid
Medial pterygoid
Masseter

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5
Q

What does temporalis do?

A

Elevates and retracts mandible
Assists in rotation

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6
Q

What does masseter do?

A

Elevates and protracts mandible
Assists in lateral movement

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7
Q

2 major types of mandibular movement?

A

Rotation and translation

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8
Q

What is rotation movement

A

Small amount of mouth opening (up to 20mm)
Condyle and disc remain within fossa
No downwards or forwards movement
Also known as hinge movement

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9
Q

What is the terminal hinge axis?

A

Rotation of condylar heads around an imaginary horizontal line through the rotational centres of the condyles
Imaginary line is termed terminal hinge axis

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10
Q

What is translation of the condyle?

A

Lateral pterygoid contracts
Condyle and disc begin to move
Travel downwards and forwards (may also travel laterally) along incline of articular eminence

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11
Q

What is a facebow

A

Records relationship of maxilla to terminal hinge axis of rotation of mandible and distance between condyles for semi adjustable articulators

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12
Q

What does posselts envelope show?

A

Extremes of mandibular movement
Border movements of mandible in sagittal plane

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13
Q

What are the movements in posselts envelope

A

P= Protrusion
E= Edge to edge
ICP= Intercuspal position
RCP= Retruded contact position
R= Retruded axis position
T= Maximum opening

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14
Q

What is intercuspal position

A

Tooth position regardless of condylar position
Maximum interdigitation of teeth

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15
Q

Types of occlusion

A

Dynamic
Static

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16
Q

How to mark tooth contacts

A

Articulating paper
Millers forceps

17
Q

What are the functional cusps in static occlusion

A

Lingual cusps of upper posterior and buccal cusps of lower posterior

18
Q

Types of dynamic occlusion

A

Canine guidance
Group function
Protrusion

19
Q

What is canine guidance

A

When mandible moves to working side contact made only between canines with no posterior tooth contacts- mutually protected occlusion

20
Q

What is group function

A

When mandible moves to working side, multiple teeth in contact on working side- toothwear

21
Q

Problem with dynamic occlsuion

A

Occlusal interference (working side, non working side, protrusive)

22
Q

What is lateral translation of the mandible also known as?

A

Bennet movement

23
Q

What is this angle

A

Bennet angle

24
Q

Types of articulators

A

Average value
Semi-adjustable
Arcon

25
Q

How to register ICP

A

Wax- ICP not obvious- very thin- cusp tip visible
Registration paste- ICP not obvious- silicone paste- thin
Record blocks- free end saddles- casts cannot be hand articulated
No materials- ICP obvious- multiple teeth contact when bite together

26
Q

What is conformative approach/reorganised approach?

A

Conformative- ICP registration without OVD increase
Reorg- opposite- want change

27
Q

When not to use conformative approach

A

Need to make space for restorations
Want change in aesthetics
Teeth out of position

28
Q

Techniques to put teetb intk RCP?

A

Bimanual manipulation
Chin point guidance
Chin point guidance with anterior jig

29
Q

What is the retruded contact position

A

First tooth contact when mandible is in retruded axis position

30
Q

How to register RCP

A

Wate
Paste
Record block

BDS4 (50 decks)

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