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Occlusion > Mechanisms of Mandibular Movement > Flashcards

Mechanisms of Mandibular Movement Flashcards

1
Q

What are the 4 anatomic determinants of movement?

A

Right TMJ
Left TMJ
Teeth/Occlusion
Neuromuscular

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2
Q

Which axis of the mandible is the most basic fundamental?

A

Hinge Axis

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3
Q

___ is the imaginary line drawn between the 2 condyles where the mandible will open and close about this axis

A

Hinge Axis

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4
Q

_____ is the movement of the mandible forward until front teeth come into contact

A

Protrusion

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5
Q

What muscles are involved in protrusion?

A

lateral pterygoid; assisted by medial pterygoid

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6
Q

What muscles are involved in retraction?

A

Posterior fibers of temporalis, deep masseter, and geniohyoid and digastric

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7
Q

What muscles are involved in elevation?

A

Temporalis, masseter, and medial pterygoid

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8
Q

What muscles are involved in depression?

A

digastric, geniohyoid, and mylohyoid muscles

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9
Q

What are the 2 movements of lateral movements of mandible?

A

Rotation and translation

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10
Q

Which condyle rotates in lateral movement?

A

Working condyle (side toward which the mandible is moving

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11
Q

Which condyle translates in lateral movement?

A

Non-working/ Balancing condyle

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12
Q

T/F: Many of the terms and words of occlusion originated with the construction of denture

A

True

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13
Q

____ occurs when condyles move down articular eminence

A

Translation

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14
Q

_____ occurs for the first 20-25mm of opening

A

Rotation

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15
Q

Only _____ movement can be isolated clinically

A

rotational movement

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16
Q

_____ movements may occur in all three reference planes in the mandible

A

Rotational movements

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17
Q

What are the 3 planes rotation can occur?

A

Sagittal, frontal, and horizontal

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18
Q

_____ in the vertical plane around a sagittal center of rotation Occurs during lateral movement Sagittal axis is in the working side condyle; Non-working side moves inferiorly in the frontal plane around sagittal axis

A

Rotation

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19
Q

____ in the horizontal plane around a frontal (vertical)axis; Frontal axis is in the working side Occurs during lateral movement; non working moves medially and forward in the horizontal plane around this frontal axis

A

Rotation

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20
Q

Where all three axes (horizontal,vertical and sagittal) meet is called the ______

A

rotational center of the condyle

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21
Q

To do a protrusive movement, both _____ contract to move mandible forward

A

Lateral pterygoids

22
Q

What muscle functions in translation?

A

Lateral pterygoids

23
Q

In what movement do Both condyles translate; Condyles move forwards and downwards; Condyles move down the posterior slope of the articular eminence

A

Protrusive movement

24
Q

The ______ is the only joint in the body capable of moving in three dimensions.

A

temporomandibular joint

25
Q

When a condyle moves in a _______, it goes over the medial wall of the glenoid fossa

A

Lateral translation

26
Q

During, the angle is influenced by the ______ of the articular eminence.

A

posterior slope

27
Q

The condylar angle measured via lateral movement is influenced by the ______ of the articular fossa (non-workingside)

A

steepness of the medial wall

28
Q

once the condyle begins to move in any direction, it is no longer ______, it will begin to move either forward or laterally in the fossa.

A

rotating

29
Q

An immediate lateral shift of the working condyle is called

A

Immediate side shift

30
Q

A slower lateral shift of the working condyle is called

A

Progressive side shift

31
Q

During a lateral movement, this is the condyle on the side towards which the mandible moves–A.k.a. rotating condyle

A

Working side condyle

32
Q

This is the condyle on the side opposite to which the mandible moves–A.k.a. orbiting condyle

A

Non-working side condyle

33
Q

_____ condyle moves downwards, forwards and medially Moves over the steeper medial wall of the articular fossa; Can record the condylar angle from this movement also; Condylar angle is usually slightly steeper than when recorded in protrusion

A

Non-working side condyle

34
Q

_____ condyle mainly rotates around a vertical axis (it does not move out of the articular fossa)

A

Working side condyle

35
Q

Sometimes the orbitingside condyle does not simply rotate but also shifts laterally during the lateral movement.This lateral movement of the orbiting side condyle is called the _______

A

Bennett movement.

36
Q

Bodily shift of the mandible toward the working side during lateral excursion

A

Bennet’s movement

37
Q

The _____ the teeth are to the working condyle, the shorter will be the cusp height

A

closer

38
Q

______ is the angle formed by the sagittal plane and the path of the advancing orbiting condyle during lateral mandibular movement as viewed in the horizontal plane.

A

Bennett angle:

39
Q

Angle at which the condyle moves away from a horizontal reference plane; can be recorded (estimated) on a patient; Can be recorded via a protrusive movement or via lateral movements

A

Condylar angle

40
Q

What is the plane of reference for the condylar angle?

A

Frankfort’s horizontal plane

41
Q

_____ is The angle formed by the intersection of the protrusive and non-working condylar paths as viewed in the sagittal plane.

A

Fischer’s angle

42
Q

The difference between the condylar angle recorded with a protrusive and lateral record; Medial wall of articular fossa is generally steeper than the posterior slope of the articular eminence (5-10°0

A

Fischer’s angle

43
Q

The dynamic relationship of the lower anterior teeth against the upper anterior teeth through all ranges of function

A

Anterior guidance

44
Q

What are the only 2 teeth you want touching during lateral protrusive?

A

Canines

45
Q

What are the teeth you want touching during protrusive movements?

A

Incisors

46
Q

_______ protect the posterior teeth in all mandibular excursions

A

Anterior teeth

47
Q

____ protect anterior teeth by taking the force of closure of the mandible

A

Posterior teeth

48
Q

Class ___ lever will create the least stress to the anterior teeth

A

Class 3

49
Q

The closer to the fulcrum a tooth is, the ____ force it will have

A

More force

50
Q

If a posterior nonworking contact occurs during the protrusive biting function, the fulcrum point moves from the temporomandibular joint to the point of faulty contact, forming the Class ____ lever

A

Class 1 lever

51
Q

The premature nonworking contact (B) triggers a more forceful closure of the muscles (P) on the nonworking side. This changes the normal Class III lever system to the destructive Class ____ lever system and puts an unusual amount of stress on the undesired contact.

A

Class 2 lever

52
Q

The amount of _____ that can be generated between the teeth depends on the distance from the temporomandibular joint and the muscle force vectors. Much more force can be generated on the posterior teeth, than on the anterior teeth.

A

force

Occlusion (13 decks)

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