TMJ and occlusion Flashcards

1
Q

What muscles open the mouth?

A

Lateral pterygoid

Geniohyoid
Mylohyoid
ABG

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2
Q

What muscles close the mouth?

A

Masseter
Temporalis
Medial pterygoid

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3
Q

What muscles are involved in protrusion?

A

Masseter
Medial pterygoid
Lateral pterygoid

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4
Q

What muscles are involved in retrusion?

A

Temporalis
Geniohyoid
ABG

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5
Q

What muscles are involved in lateral excursion?

A

Lateral pterygoid
Medial pterygoid

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6
Q

What muscles are involved in lateral movement?

A

Masseter
Temporalis

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7
Q

What innervates the MOM?

A

Vc

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8
Q

What innervates masseter?

A

Masseteric nerve

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9
Q

What innervates Temporalis?

A

Deep temporal nerve

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10
Q

What innervates the pterygoids?

A

Nerve to m. Pterygoid
Nerve to l. Pterygoid

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11
Q

What innervates Geniohyoid?

A

C1

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12
Q

What innervates mylohyoid?

A

Nerve to mylohyoid

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13
Q

What innervates ABG?

A

Nerve to mylohyoid

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14
Q

What movement is jaw opening?

A

Hinge

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15
Q

What movement is wide jaw opening?

A

Hinge and slide

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16
Q

What movement is protrusion?

A

Slide

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17
Q

Where does the condyle sit?

A

Glenoid fossa

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18
Q

What does the lateral ligament function to do?

A

Restricts posterior, lateral and inferior movement

Restricts contra lateral medial movement

Limits extent of pure hinge movement

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19
Q

What are the accessory ligaments?

A

Stylomandibular
Sphenomandibular
Pterygomandibular

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20
Q

What is the function of accessory ligaments?

A

Limits range of movement

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21
Q

What are the 2 compartments of the articular disk?

A

Upper - slide
Lower - hinge

22
Q

What are the 5 zones of the articular disk ?

A

Anterior extension
Posterior extension
Disc; anterior band, int zone, posterior band

23
Q

What part of the disk if continuous with the lateral pterygoid?

A

Anterior extension

24
Q

What parts of the TMJ are innervated?

A

Joint capsule

25
Q

What is the main source of innervation to the TMJ?

A

Trigeminal- mandibular division
- auriculotemporal

26
Q

What is the blood supply to the TMJ?

A

Branches of external carotid
- maxillary
- superficial temporal

27
Q

What are the 4 types of articulators?

A

Simple hinge
Plane line
Average value
Semi adjustable

28
Q

What is the purpose of a simple hinge articulator?

A

Holds casts together

29
Q

What is the purpose of simple hinge articulator?

A

Holds casts together

30
Q

What is the purpose of plane line articulator?

A

Restorations involving guidance
Arbitrary hinge

31
Q

What is the purpose of an average value articulator?

A

Fixes prostheses for teeth involved in guidance
Removable prostheses

32
Q

What is the name of the mandibular semi adjustable articulator?

A

Debar Mark II (arcon)

33
Q

What other instrument is needed to take a measurement with the denar articulator?

A

Face bow

34
Q

What is the semi adjustable denar articulator used for?

A

Bridges/ crowns involved in guidance

35
Q

What measurements do u need for using the semi adjustable articulator?

A

RCP
relevant excursions

36
Q

what position is reproducible?

A

Rested position

37
Q

What are index teeth?

A

Teeth that are in contact

Canines
Molars

38
Q

What planes are used for the Fox’s guide plane?

A

Frankfort
Interpapilliary

39
Q

What can be used to examine ICP and excursions?

A

Articulating paper

40
Q

What is the importance of OVD RVD and FWS?

A

Face height
Eating

41
Q

How do you get patient into RCP?

A

Tongue to roof of mouth

42
Q

How can you assess vertical dimensions?

A

Willis gauge
Mirror handle

43
Q

How do you calculate FWS?

A

RVD-OVD

44
Q

What materials are available for recording occlusion?

A

Carding wax
Silicone bite registration paste

45
Q

what is ICP?

A

intercuspal position

46
Q

what is RCP?

A

retruded contact position?

47
Q

what is OVD?

A

occlusal vertical dimension

48
Q

what is RVD?

A

rest vertical dimension

49
Q

what occurs on the working side during a lateral excursion?

A

teeth in contact
bennet movement (rotation around vertical axis, lateral movement)

50
Q

what happens on the non-working side during a lateral excursion?

A

teeth do not contact
bennet angle (downwards, forwards over eminence, medial movement)