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BDS2.5 Oral Biology > Occlusion > Flashcards

Occlusion Flashcards

1
Q

What is occlusion?

A

When the upper and lower teeth come into contact

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2
Q

What are the 2 main types of occlusion?

A

Static occlusion

Dynamic occlusion

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3
Q

What is static occlusion?

A

Contacts between teeth when the mandible is closed and is stationary

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4
Q

What is dynamic occlusion?

A

Contacts between teeth when the mandible is moving relative to the maxilla

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5
Q

What is ICP and what occlusion does it relate to?

A

Intercusp position

Relates to static occlusion

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6
Q

What is ICP?

A

When teeth fit together in maximum intercuspation

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7
Q

What bite is ,ost easily recorded?

A

ICP

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8
Q

Overjet vs overbite?

A

Overjet = horizontal overlap
Overbite = vertical overlap

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9
Q

Describe class 1 occlusion?

A

Ideal position of the molars

mesio-buccal cusp of the maxillary first permanent molar occludes with the mesio-buccal groove of the mandibular first permanent molar.

Mandibular incisor edges over/just in front of the Cingular of the maxillary incisors

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10
Q

What is class 2 occlusion?

A

Mand. Incisal edges behind the Cingular of max incisors

MB cusp of max 1 molar anterior to the MB groove on mand 1st molar

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11
Q

What is class 2 division 1 occlusion?

A

Characterised by proclaimed layers, and central incisors

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12
Q

What is class 2 division 2 occlusion?

A

Characterised by proclaimed lateral incisors and retroclined central incisors

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13
Q

What is class 3 occlusion?

A

Mandibular incisal edges are anterior to the cingulum of the maxillary incisors or in reverse relationship to the incisors, edges

MB cusp of max 1st molar sits posterior to the MB of the mandibular 1st molar

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14
Q
A
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15
Q

What is malocclusion?

A

When the teeth are not occluding in an ideal position

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16
Q

Why is this class 1 malocclusion?

A

There is crowding

17
Q

What are the functional cusps?

A

Palatal cusps of the maxillary posterior teeth

Buccal cusps of the mandibular posterior teeth

18
Q

What is the role of functional cusps?

A

Maintain vertical dimension of occlusion

They transmit occlusal forces axilally

They may be involved in interference

19
Q

What is dynamic occlusion?

A

Contacts between teeth when the mandible is moving relative to the maxilla

Mandible is moved by the muscles attached to the mandible

Movement of the mandible is influenced by 2 guidance systems

20
Q

What 2 guidance systems influence movement of the mandible?

A

Posterior and anterior determinants

21
Q

What are the posterior determinants?

A

Anything to do with TMJ

22
Q

What are the 2 TMJ systems?

A

The TMJ joint

TMJ ligament and joint capsule

23
Q

What are the 2 main movements of the TMJ?

A

Rotation

Translation

24
Q

What is the translation movement of the TMJ?

A

Movement of the head of the condyle downwards and forwards along the distal face of the articular eminence of the glenoid fossa on the intra-articular disc

25
Q

What are the anterior determinants?

A

The guidance by teeth e,g, molars

26
Q

What is the working side?

A

Is the side of the mandible towards which the mandible is moving during lateral excursion

The side to which the mandible moves

27
Q

Is canine guidance involved in dynamic occlusion?

A

Yes

28
Q

During lateral excursions, what teeth are preferable for guidance?

A

Teeth towards the front of the mouth, I.e. premolars as opposed to molars

29
Q

What are the 2 types of guidance during lateral excursion?

A

Group or canine

30
Q

What occurs on the non-working side during lateral excursion?

A

Disocclusion/excursion

31
Q

What is mutually protected occlusion?

A

A dynamic occlusal relationship in which the posterior teeth contact in maximum intercuspation, but not in lateral or protrusive movements

Anterior teeth protect the posterior teeth during excursion movements

The posterior teeth protect the anterior teeth in maximum intercuspation

32
Q

What is christensen’s phenomenon?

A

The triangular space between the maxillary and mandibular posterior teeth bilaterally during protrusion

This gap is caused by the incline of the articulation eminence

33
Q

What causes the christensen’s phenomenon?

A

The gap is caused by the incline of the articulation eminence

34
Q

When can occlusal interference occur?

A

Any occlusal contacts during mandibular excursion

35
Q

What is occlusal interference?

A

Amy occlusal contact(s) during mandibular excursions that may interfere with the smooth movement and guidance of the mandible in relation to the maxilla

36
Q

What can cause restorations to fail over time?

A

An interference from posterior teeth on the non working side during lateral excursion may cause restoration to fail over time

BDS2.5 Oral Biology (10 decks)

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