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Occlusion > Week 3 - Mandibular Movements > Flashcards

Week 3 - Mandibular Movements Flashcards

1
Q

Occlusal Stability

A

Anatomic and functional harmony caused by the balance between the elevator and depressor muscles

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2
Q

At rest, where is the jaw?

A

Suspended 2-4 mm in space

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3
Q

(According to this class) What are the muscles of mastication?

A

Digastric
Masseter
Temporalis
Lateral Ptrygoid

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4
Q

Diagastric muscle

A

Helps open the jaw

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5
Q

Masseter muscle

A

Helps close and crush

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6
Q

Temporalis muscle

A

Closes the jaw

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7
Q

Lateral Pterygoid muscle

A

Open and orient the jaw

Has two heads that act like oars on a boat

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8
Q

Articulating disc

A

Biconcave disc in the TMJ to protect the bone from the joint

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9
Q

What two bones are included in the TMJ?

A

Mandible and Temporal bone

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10
Q

What direction does the jaw move during protrusion?

A

Down and forward

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11
Q

Midsagittal section of the head

A

Median plane

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12
Q

Transverse section of the head

A

Horizontal plane

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13
Q

Coronal section of the head

A

Frontal plane

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14
Q

Rotation movement of the mandible

A

Rotating around its long axis

Mandible stays in the same location

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15
Q

Translational movement of the mandible

A

Leaves the former space and goes to another

In the mandible, this occurs when it moves forward

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16
Q

THA (Terminal Hinge Axis or Transverse Horizontal axis)

A

Imaginary line that connects the condyles

The mandible rotates around this axis

17
Q

Working side

A

The side towards which the mandible moves during lateral movement

18
Q

Non-working side

A

The side opposite the working side

19
Q

What direction does the non-working side move during right lateral movement?

A

It moves downward, forward, and medial

20
Q

What direction does the working side move during right lateral movement?

A

Laterally

21
Q

Bennett’s Movement/Bennett’s Cone

A

The working side movement can go anywhere within a cone (called Bennett’s cone)

22
Q

Bennett’s Side Shift

A

Mandibular Lateral Rotation
During lateral movement, the jaw has to translate forward slightly, because it is up against a wall and at an angle. When it twists, it has to come forward because it can’t move the skull

23
Q

What motion does the jaw move during chewing?

A

It opens and closes in a tear-drop shape

24
Q

Ulf-Posselt’s Envelope of Motion

A

Occurs when the mouth is opening and closing

The mandible first rotates and then it translates

25
Q

Centric relation curve

A

The curve seen when the mandible first rotates

26
Q

Curve of translation

A

When the mandible translates after rotating during opening in Ulf-Posslet’s envelope of motion

27
Q

Initial Point of contact

A

In 90% of the population, CO occurs with two teeth and then slide into MI
In 10% of the population, they go straight into MI (CO = MI)

28
Q

What are the funcitons of Anterior Teeth?

A 
Anterior Guidance
Perform Initial acts of mastication
Speech
Lip Support
Esthetics
29
Q

Anterior Guidance

A

The anterior teeth overlap, creating an angle, which help guide occlusion

30
Q

What is anterior guidance dictated by?

A

Position of the incisal edge of the mandibular anterior teeth relative to the lingual surfaces of the maxillary anterior teeth
Changes in morphology of the lingual surfaces of maxillary anterior teeth
Length of mandibular incisors or canines

31
Q

What are the 2 forms of anterior guidance, and which is ideal?

A

Incisal guidance

Canine guidance*

32
Q

Why is Canine guidance ideal?

A

Muscle activity is lower, leading to less fatigue

33
Q

What are the two occlusal schemes, which is ideal?

A

Anterior guidance

Group Function

34
Q

Group Funciton

A

The canines and molars are all touching at the same time

not ideal but sometimes necessary

35
Q

What are the three functions of the incisal guides on the articulator?

A

1) When anterior teeth are prepared, the angulations of the custom guide provides anterior guidance in the place of anterior teeth
2) When only posterior teeth are to be replaced, the angulation of the guide serves to estimate the buccolingual and mesiodistal cusp angles so as to avoid interference in both protrusive and on-working excursions
3) Reduce the amount of wear on the stone during excursive movements made on the articulator

Occlusion (12 decks)

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