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CSP3 YR5- Restorative RESET > Occlusion > Flashcards

Occlusion Flashcards

1
Q

Occlusion - what is it? variation? Influence?

A 
What is it:
- the contact between teeth
Variations:
- in different ways with diff consequences and significance 
Influence:
- the masticatory function and system
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2
Q

Occlusion - types (definition)?

A

Types:

  • static (between teeth when the mandible is closed and stationary) (intercuspal position)
  • dynamic (between teeth when mandible is moving relative to maxilla)
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3
Q

Occlusion - intercuspal position - defintion?

A

Defintion:

  • when the teeth fit together in maximum intercuspation
  • the natural position of teeth in biting (most comfortable occlusion)
  • best fit regardless of condylar position
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4
Q

Occlusion - defects?

A

Defects:

  • overjet (horizontal overlap)
  • overbite (vertical overlap)
  • openbite (teeth don’t contact each other)
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5
Q

Occlusion - intercuspal position - class I (how teeth touch?

A

How teeth touch:

  • mand incisal edges over/just in front ofncingulaum of max incisors (MB cusp of max)
  • first molar in the MB groove on mand first molar
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6
Q

Occlusion - intercuspal position - class II (how teeth touch? Div 1? Div 2?

A

How teeth touch:
- mand incisal edges behind the cingulum of the max incisors
- MB cusp of max first molar ant to the MB groove on mand first molar
Div 1:
- max ant are further ahead very protruding maxilla
Div 2:
- max teeth retroincline (hug max central incisors)

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7
Q

Occlusion - intercuspal position - class III (how teeth touch?

A

How teeth touch: malocclusion;

  • mand incisal edges far ant to the cingulum of max incisors or in reverse relation to incisal edges
  • MB cusp of max first molar post to the MB groove on mand first molar
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8
Q

Occlusion - functional cusps - how they touch? Why like this?

A 
2mm normal for an overjet
How they touch:
- palatal cusps of the maxillary post teeth
- buccal cusps of mand teeth
Why like this:
- maintain vertical dimension of occlusion
- transmit occulusal forces axially
- involved in interference
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9
Q

Occlusion - dynamic occlusion - why movement? Movement influenced by? Guidance 2 systems?

A 
Why move:
- moved by the muscles attached to mandible
Movement infleunce:
- by 2 guidance systems
Guidance systems:
- posterior and anterior determinants
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10
Q

Occlusion - post/ant determinants - what are they?

A

2 TMJ systems
Posterior are the condyles
Anterior are the teeth

Posterior determinants learn the head anatomy critically

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11
Q

Occlusion - scissor and cross bites

A

Answer

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12
Q

Occlusion - movements of TMJ - overview? How it works? Joint type?

A

Rotation and translation
Rotation:
- initial opening move the TMJ rotates within the joint space
- final stage of closing movement the TMJ roattes within the joint space
Joint type:
- hinge

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13
Q

Occlusion - functional cusps (max and mand)

A

Max - palatal cusps
Mand - buccal cusps

ANATOMY IS CRITICAL

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14
Q

Occlusion - TMJ - translation (defintion)

A

Translation:
- movement of the head of the condyle downwards and dowards along the distal face of the articular eminence of the glenoid fossa on the intra-articular disc, at the end if the rotator movement as the mandible is open further

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15
Q

Occlusion - anterior determinants - what is it? Touching? Teeth? Openbite/class 3 ICP?

A 
What is it:
- the teeth
Touching:
- maxillary and mandibular teeth are touching each other during the mandibular excursions then the those teeth are providing guidance to the mandivualr movement 
Teeth:
- all ant to the TMJ
Openbite:
- possible that an individual may have ant guidance in a molar teeth on protrisce movement (such as openbite and class 3)
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16
Q

Occlusion - mandible - working side?

A
  • The side of the mandible towards which the mandible is moving during lateral excursion
  • Greatest amount if teeth to teeth contact
17
Q

Occlusion - mandible - non-working side?

A
  • The side away from which the mandible is moving in lateral excursion
  • However, the non working side condyle that undergoes most movement in lateral excursion
18
Q

Occlusion - anterior guidance - lateral excursion?

A
  • to move to the left or the right side
19
Q

Occlusion - anterior guidance - canine guidance?

A
  • dynamic occlusion that occurs on the canine in the working side in lateral excursion
  • working side is the side to.whixh the mandible moves
20
Q

Occlusion - anterior guidance - group function?

A

Group function:

  • dynamic occulsuoj is shared by several teeth on the working ISD in lateral excursion
  • generally premolars
  • guidance to be towards the front of the mouth (premolars as opposed to molars)
  • take notes if are molar
21
Q

Occlusion - disocclusion in excursion - what is it?

A

What is it:
- lateral excursions the working side guidance (either canine or group) cause the teeth in the non-working side to disocclude

22
Q

Occlusion - mutually protected occlusion - what is it?

A

What is it:

  • dynamic occlusal relationship in which the posterior teeth contact in maximum ICP, but not in lateral or protrusive movements
  • posterior teeth protect ant from occlusal forces
  • ant teeth protect the post teeth during excursive movements
23
Q

Occlusion - Christensen’s phenomenon - what is it?

A

What is it:

  • triangular space between max and mandible posterior teeth bilaterally during protrusion
  • caused by incline of the articular eminence
24
Q

Occlusion - occluslal interference - what is it?

A

What is it:

  • any occlusal contact during mand excursions that may interfere with the smooth movements and guidance of the mandible in relation to maxilla
  • causes an abrupt movements of the mandible away from the guidance provided by the posterior TMJ and the ant determinants (guidance)
25
Q

Occlusion - working side interference - what is it?

A

What is it:

  • any occlusal contacts on the working side towards the back of the mouth (molars), whilst still providing anterior teeth guidance, may interfere with the movement of the non-working side condyle
  • because the contact occurs closer to the condyle and therefore is likely to interfere with the movement of the non-working side condyle down the articular eminence
  • if the guiding contact between max and mand teeth on the working side occurs towards the first of thr mouth (pre/canine) then such contacts are unlikely to interfere with the movements of the non-working side condyle
26
Q

Occlusion - non-working side interference - what is it?

A

What is it:

- interference from the post teeth on the non working side during lateral excursion

27
Q

Occlusion - applied occlusion - what is it?

A

What is it:

- on restorations, in time that restoration will fail

CSP3 YR5- Restorative RESET (44 decks)

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