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Occlusion > Occlusion principles > Flashcards

Occlusion principles Flashcards

1
Q

What is occlusal stability?

A

the balance between elevator and depressor muscles

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2
Q

What are the muscles of mastication?

A

masseter, anterior belly of digastric, medial and lateral pterygoids

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3
Q

Which MoM helps to orient the jaw?

A

lateral pterygoid

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4
Q

The __________ (superior/ inferior) head of lateral pterygoid attaches to articular disk.

A

superior

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5
Q

The ____________ (superior/ inferior) head of lateral pterygoid attaches to neck of the condyle.

A

inferior

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6
Q

The condylar angle is usually about __________ degrees.

A

45

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7
Q

What are the three planes used to describe mandibular movements?

A

frontal, sagittal and horizontal

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8
Q

True/ False: The mandible can rotate and translate at the same time

A

TRUE

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9
Q

Around which axis does rotation occur?

A

terminal hinge axis (THA)

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10
Q

The mandible rotates during the first __________mm of incisal separation.

A

20-25

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11
Q

True/ False: During straight protrusive movement, both condyles move in different directions.

A

FALSE the condyles work together in same direction

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12
Q

During lateral translation, which condyle undergoes Bennett movement?

A

working condyle

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13
Q

What is Bennett movement/ cone of Bennett?

A

the special lateral translational movement of the working condyle. working condyle can move anywhere within cone of Bennett

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14
Q

Describe the movement of the non-working condyle.

A

forward and medial

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15
Q

What shape is the path of the mandible during chewing?

A

teardrop

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16
Q

What is the envelope of motion?

A

the range of movement in the three planes of orientation using the reference point between the two mandibular central incisors. described by Ulf Posselt

17
Q

What is the centric relation arc of curvature?

A

arc traced by mandible as it closed from rotational/ hinge position

18
Q

True/ False: Centric relation is dependent upon tooth contact.

A

FALSE independent of tooth contact

19
Q

What is centric relation (CR) and what is it restricted by?

A

a spacial relationship between the maxilla and mandible (any point of the centric relation arc of curvature) ; restricted to a purely rotary movement about the THA

20
Q

What is centric occlusion (CO)?

A

the initial contact of one or two teeth as the mandible closes in centric relation

21
Q

Where are the initial CO contact points on mandibular teeth?

A

distal incline

22
Q

Where are the initial CO contact point on maxillary teeth?

A

mesial inclines

23
Q

When all teeth are closed together as best they can, this position is known as _____________.

A

maximal intercuspation (MI)

24
Q

MI is determined by ________ and _________ (is/ is not) susceptible to change throughout life.

A

teeth, is

25
Q

What is observed when teeth move from centric occlusion to maximal intercuspation?

A

centric slide

26
Q

What is the habitual arc of closure?

A

the path the mandible traces when it closes from maximum open position

27
Q

Is the habitual arc of closure reproducible?

A

NO since it is not a border position

28
Q

What is the physiologic rest position (PRP)?

A

position mandible assumes when all muscles are at a state of equal relaxation

29
Q

On which arc does PRP lie?

A

habitual arc of closure

30
Q

The space between teeth in PRP is called__________.

A

interocclusal rest distance

31
Q

How can we determine interocclusal rest distance?

A

VDR-VDO= interocclusal rest space

32
Q

What is vertical dimension of occlusion (VDO)?

A

the distance between 2 arbitrary reference points above or below the mandibular and maxillary teeth or attached gingiva or skin over the mandible and cranium while teeth are in MI

33
Q

What is vertical dimension at rest (VDR)?

A

the distance between 2 arbitrary reference points in the PRP.

34
Q

What are the functions of anterior teeth?

A

anterior guidance, perform initial acts of mastication, speech, lip support, esthetics

35
Q

What is anterior guidance?

A

the resultant protrusive path the lower incisors must take due to anterior teeth contact

36
Q

Anterior guidance is determined by the _______________ of maxillary teeth and the _________ and ____________ overlap max and mand teeth

A

lingual concavities, vertical, horizontal

37
Q

Anterior guidance causes _________ disclussion.

A

posterior

38
Q

What is anterior guidance dictated by?

A

1) position of incisal edge of mandibular anterior teeth relative to the lingual surfaces of the maxillary anterior teeth
2) changes in morphology of the lingual surfaces of the maxillary anterior teeth.
3) length of mandibular incisors or canines

39
Q

Why is canine guidance preferred?

A

Muscles are at the lowest activity

Occlusion (2 decks)

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