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BDS2.5 Oral Biology > Mandibular Movements > Flashcards

Mandibular Movements Flashcards

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1
Q

What cusp of the mandible molar teeth are normally seated in the central fossa of maxillary molars?

A

Distobuccal

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2
Q

What do the palatal cusps of the maxillary bicuspids contact?

A

Contact the marginal ridges of mandibular bicuspids and 1st molar

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3
Q

What cusp of the maxillary molars are seated in the central fossa of the mandibular molars?

A

The mesiopalatal

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4
Q

In intact unworn teeth where are the actual contact points?

A

Called centric stops or holding contacts, because they serve to hold the teeth in a stable position

The supporting cusp contact the opposing inclines leading tip the fossae - ideally with a buccal and lingual contact for each cusp

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5
Q

What are the actual contact points called?

A

Centric stops or holding contacts

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6
Q

What are the contact points of intact supporting cusps?

A

Contact on inclines leading the the central fossa with a buccal and lingual contact for each group

They have at least 1 mesial or distal contact with opposing marginal, triangular, transverse or oblique ridges

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7
Q

How many contacts allows the firm position of a supporting cusp?

A

At least 3

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8
Q

What are the contacts of supporting cusps called?

A

Tripodisation or tripodism of posterior occlusal contacts

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9
Q

What are the 2 main types of anterior guidance in lateral excursion?

A

Canine guidance

Group function

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10
Q

What guidance is involved in protrusion?

A

Incisor guidance

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11
Q

Describe Invisalign guidance

A

In protrusion the mandibular incisal edges glide down along the palatal inclines of the maxillary incisor teeth

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12
Q

What side are the condylar and bennet angles measured?

A

Non-working side condyle

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13
Q

What is the condylar or bennet angle?

A

The angle down the saggy tail plane and horizontally towards the working side

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14
Q

What is a condylar movement?

A

The immediate non-progressive side shift it immediate side shift or bennet movement

The movement of the working side condylar head outwards (laterally) during lateral excursion

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15
Q

Describe the condylar movement?

A

This movement is immediate and non-progressive

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16
Q

Why does immediate side shift happen?

A

It is the effect of downward, forward and inward movement of the non working side condyle during lateral excursion

17
Q

What is the condylar angle?

A

The angle formed by the downward movement of the non working condyle to the horizontal plane

18
Q

What is the general condylar angle?

A

22-65

Usually around 30

19
Q

What is the Bennet angle?

A

The angle formed from the medial movement of the non working condyle to the vertical plane

20
Q

What is the Bennet movement?

A

Forward downward and inward translation and the rotation of the working side

Working side condyle moves laterally in the direction of the lateral excursion and sometimes slightly downwards. This bodily lateral shift of the mandible is called the bennett movement

21
Q

What is the average shift of the bennet movement?

A

1.5mm

22
Q

Can the Bennet angle exist even in the absence of the Bennet movement?

A

Yes

23
Q

What is the centric relation?

A

Position of the mandible to the maxilla with the intra-articulation disc in place, when the head of the condyle is against the most superior part of the distal facing incline of the glenoid fossa

I.e the condyle is in the uppermost and foremost position within the glenoid fossa

24
Q

What is posselt’s envelope of movement?

A

Gives an idea of the different movements of the mandible

On the saggital plane

25
Q
A

A = closed
B = more arrest
E = fully open
F = protrusive

26
Q

What are the superior parts of the posselt’s diagram related to?

A

Protrusive movement

27
Q

What determines the superior movement?

A

Tooth contact

28
Q

What determines posterior movement?

A

Joint ligaments

29
Q

What determines inferior movement?

A

Muscle lengthening

30
Q

What determines anterior movement?

A

Joint ligaments

31
Q
A
32
Q
A
33
Q

What is used to classify traumatic incisal overlap?

A

Ackley’s classification

34
Q

What are the 4 rules in occlusion?

A
35
Q

In ideal occlusion, what are the other elements of stomatognathic system?

A

Neuromuscular elements

Temperomandinular joint structures

Teeth and supporting structures of the teeth

BDS2.5 Oral Biology (10 decks)

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