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3rd yr- CSB- Occlusion > Jaw Movements and Articulators > Flashcards

Jaw Movements and Articulators Flashcards

1
Q

What are crown made on and why?

A

Made on an articulator as it can replicate jaw movement

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2
Q

Name the different moments/ positions your jaw can be in

A
  1. Intercuspal position (ICP)
  2. Protrusion
  3. Lateral movement
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3
Q

What is rotation

A

The jaw rotating up to 20mm

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4
Q

What is translation of the jaw

A

The jaw coming forward from the gelnoid fossa

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5
Q

Where does the jaw translate from and where to?

A

Slides from the glenoid fossa to the articular eminence

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6
Q

How do you open you jaw?

A

You rotate it and translate it at the same time

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7
Q

What is condylar guidance

A

Sliding of the articular eminence when the jaw comes forward

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8
Q

When moving your jaw side to side what do we call the slide you are slide towards

A

The working side

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9
Q

Which forces are posterior teeth designed for?

A

Vertical forces

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10
Q

What happens if posterior teeth experience excess horizontal forces?

A

They can crack

They can were down

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11
Q

Name the 2 groups patient can fit into when we describe their occlusion

A
  1. Canine guidance

2. Group function

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12
Q

What is canine guidance

A

When the patent moves their jaw to the side only the canines stay in contact

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13
Q

When placing an amalgam or composite restoration what type of treatment are we aiming to do?

A

Con formative treatment

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14
Q

What is con formative treatment

A

Any restoration that does not change the way the teeth:

  1. Meet together in ICP
  2. Slide across each other in lateral and protrusive movements
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15
Q

What does ICP stand for

A

Intercuspal position

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16
Q

What are crowns made on?

A

Articulators

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17
Q

What do articulators do?

A

They aim to replicate the jaw arrangements and movements of plaster models

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18
Q

How do we change from the ICP to an open position

A
  1. Rotation

2. Translation

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19
Q

How much does the jaw rotate when it opens

A

20mm

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20
Q

Around which point does the jaw rotate

A

The terminal hinge axis

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21
Q

Where is the terminal hinge axis?

A

The central point of the condyle

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22
Q

Name the main muscle involved in opening the jaw

A

Digastric muscle

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23
Q

What does the digastric muscle do?

A

It pulls the mandible backwards

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24
Q

What is translation

A

The forward movement of the jaw

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25
Q

Where does the jaw slide down when it is opening/ translating

A

The articular eminence

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26
Q

Which muscle pulls the jaw forwards and down?

A

Lateral ptergoid

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27
Q

Name the main muscle involved in closing the jaw

A

Temporalis
Masseter
Medial pterygoid

28
Q

Name the steps involved in closing the jaw

A

Protrusion

29
Q

What is protrusion

A

The condyles on both side being pulled forwards at the same time

30
Q

Which muscles are involved in protrusion

A

Lateral pterygoid

31
Q

What term is used to describe the jaw coming forwards as sliding down the articular eminence?

A

Condylar guidance

32
Q

What does the condylar guidance angle tell us?

A

Tells us the verticalness of slop of the articular eminence

33
Q

What is the normal range of the condylar guidance angle?

A

Around 20-70 degrees

34
Q

What do we need to know to be able to measure the condylar guidance angle?

A

Need to know the start and end points of the condyle

35
Q

What terms do we give to each Side of the mouth when we are describing lateral movement?

A
  1. Working side

2. Non working side

36
Q

What is the working side

A

The side our jaw is moving to

37
Q

Describe the condylar movement on the working side

A

The condyle is moving side ways

38
Q

Describe the condylar movement on the non working side

A

The condyle is moving forwards and across

39
Q

Which muscle is involved in lateral movement of the jaw

A

Lateral ptergoid

40
Q

Name the 2 components of lateral movement of the jaw

A
  1. Immediate side shift

2. Progressive side shift

41
Q

Give examples of some occlusal schemes

A
  1. Canine guidance

2. Group function

42
Q

What is the immediate side shift

A

The first slight movement of the jaw to the side

43
Q

What do articulators allow us to do?

A

Allow us to :

  1. Exam the occlusion
  2. Fabrication of restorations
  3. Investigate proposed changes to the occlusion (eg canine guidance to group function)
44
Q

What does an articulator need to be Abel to represent?

A

Jaw movements

45
Q

Which jaw movements must an articulator be able to represent?

A
  1. Opening and closing around a hinge axis matching the patient
  2. Protrusion with condylar guidance angle match the patient
  3. Lateral movements
46
Q

Which part of the articulator do we change to make sure the jaw movements mimic that of the patient?

A
  1. The condyle of the articulator needs to be in the same position as the condyle on the patient
    2, The slope the condyle travels down needs to be at the same condylar guidance angle as the patient
47
Q

Name the different types of articulators

A
  1. Hinge
  2. Average valve
  3. Semi adjustable
  4. Fully adjustable
48
Q

What can a simple hinge articulator recreate?

A
  1. ICP

2. Opening and closing by rotation

49
Q

Which muscle pulls the amndible backwards when opening

A

The digastric muscle

50
Q

What does the lateral pterygoid muscle do?

A

It pulls the mandible forward and down

51
Q

What is the lateral ptergoid involved in?

A

Lateral movement of the jaw

Protrusion

52
Q

What is the simple hinge good for?

A

Holding the teeth in ICP Which would be useful when making a crown for a canine guidance patient

53
Q

What can an average valve articulator recreate?

A
  1. ICP
  2. Opening and closing by rotation and translation
  3. Lateral movement
54
Q

State the AVERAGE values for the distaff between condyles

55
Q

State the AVERAGE values for the distance from condyle to incised edge

56
Q

State the AVERAGE values for the condylar guidance angle

A

30 degrees

57
Q

What is a key disadvantage when using average valve articulators

A

They work on average values only so you can’t change the:

  1. Distance between condyles
  2. Distance from condyle to incised edge
  3. Condylar guidance angle
58
Q

What can a semi adjustable articulator recreate?

A
  1. Position of hinge axis
  2. ICP
  3. RCP
  4. Lateral movements
59
Q

What is RCP

A

The most protruded position of the jaw

60
Q

What tool do we need to use to measure the position of the hinge axis?

61
Q

What can we adjust on a semi adjustable articulator?

A
  1. Hinge axis
  2. Condylar angles
  3. How far the Jaw hoes to the side
62
Q

What can a fully adjustable articulator recreate?

A
  1. Position of the hinge axis
  2. ICP
  3. RCP
  4. Lateral movements
63
Q

What can be adjusted in a fully adjustable articulator

A
  1. All surfaces of the gelled fossa
  2. Inter condylar width
  3. ISS
  4. Progressive side shift
  5. Condylar angle
64
Q

What does a face bow do?

A

It records the position of the hinge axis

65
Q

Which articulator would be best is you are only interested in getting the restoration correct in ICP?

A

Hinge articulator

66
Q

Which articulator would you use if you were making a denture

A

Average valve articulator

67
Q

Which articulator would you use if you wanted to ensure that lateral and protrusive excursions not create unwanted interferences

A

Semi adjustable

3rd yr- CSB- Occlusion (7 decks)

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