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CSAR > CSAR 21-24 - Occlusion > Flashcards

CSAR 21-24 - Occlusion Flashcards

1
Q

What parts of the body are involved in occlusion?

A 
Teeth 
Periodontium 
MOM
TMJ 
Neurological system
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2
Q

What programmes dynamic occlusion and how?

A

Central Pattern Generator (CPG)

Adapts into teeth as much as possible, negotiating interferences and hard to change pathway once CPG imbedded

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3
Q

What are the 2 varied movements in functional occluding pathways?

A

Broad (cow like) –> broad wide movement

Constrained (rat like) –> up and down

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4
Q

How may functional occlusion by adapted and not adapted to?

A

Adapted if functional pathway restored
Can adapt through tooth wear or loosening of teeth
No adaption when incorrect guidance or palatal surfaces are too convex

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5
Q

Define fremitus.

A

When bite together and tooth moves out of the way

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6
Q

What methods can be used to increase inter-occlusal space?

A

Prep - occlusal reduction
Relative axial tooth movement - Dahl concept - used for cracked tooth syndrome
(Ortho)

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7
Q

What static occlusion goals want to be achieved?

A

Simultaneous bilateral stable posterior contacts apically directed, protecting anterior teeth from splaying
Want cusp fossa relationship

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8
Q

What dynamic occlusion goals want to be achieved?

A

Smooth gliding excursive movement - canine/group function

Want immediate separation of anterior teeth

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9
Q

What are the movements of the condyle in lateral excursion?

A

WS –> rotation

NWS –> orbit

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10
Q

What are the condylar movements in jaw opening?

A

20mm of opening - hinge opening

Condyle then translates down articular eminence to open further

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11
Q

Why is a 1.Arcon and 2.Non-arcon articulator and their use?

A
  1. Articulated condyle (e.g.Whipmix) - common in fixed pros to replicate hinge movement of mandible and for changes in OVD
  2. Non-articulated condyle (e.g.Dentatus) - used for removable pros
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12
Q

Why is a face bow used for a semi-adjustable articulator?

A

Facebow allows maxillary casts to be in relation to the condyles in dynamic occlusion

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13
Q

Why is dynamic occlusion inaccurate from a simple hinge articulator?

A

Simple hinge rotation axis not anatomical - it is lower down

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14
Q

What face bow is used for a fully adjustable articulator (unnecessary accuracy)?

A

Kinematic record - true hinge axis

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15
Q

What face bows are used for a semi adjustable articulator (sufficient accuracy)?

A

Earbow record - arbitrary hinge axis

Kois Dento-Facial Analyser - arbitrary hinge axis with average values

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16
Q

What does the Kois face bow measure?

A

Facial midline and aesthetic plane

17
Q

What is the difference between 1.conformational and 2.reorganisational approaches with occlusion?

A
  1. Fitting in with existing occlusion and ICP
  2. Where original ICP can not be used due to lack of inter-occlusal space: worn dentition, missing teeth (no replacement = dento-alveolar compensation) and complete overbite patient
18
Q

What reference point is used when reorganising the occlusion?

A 
New reference point 
Centric relation (seated condyle) is always a reproducible position as it is joint position and nothing to do with teeth
19
Q

What is RCP?

A

Tooth to tooth position

First contact of teeth when condyles are in centric relation (on the retruded arc of closure)

20
Q

How does a pt go from RCP into ICP?

A

90% of people slide from RCP to get their teeth to maximally interdigitate into ICP

21
Q

When is the RCP-ICP slide changed?

A

To gain anterior space by changing OVD

Preparing tooth involved in slide, most commonly last tooth in arch (7)

22
Q

If a large horizontal slide, not planned, what can happen due to the changed RCP?

A

Muscles deprogramme/relax
Neuromuscular functional pathway lost
Condyles seat into centric relation
Mandible drops back and can lead to increased OJ/ anterior open bite

23
Q

What are the manipulation techniques of finding centric relation?

A

Bimanual
Chin point
Schuyler technique - tongue to roof of mouth - reproducible

24
Q

What are the anterior midpoint stop appliances of finding centric relation?

A

Lead gauge - block for anterior teeth to bite on, therefore back teeth out of occlusion, allows slide
Kois deprogrammer
Gothic arch tracing - when missing lots of teeth

25
Q

How is centric relation recorded?

A

Teeth apart, not in RCP

Beauty hard wax or silicone reg material (Blu Mousse) used

26
Q

What is distalising the mandible and equilibrating it?

A

What to put patient into centric relation
To gain anterior space by utilising a horizontal slide
Equilibrating by tooth preparation, therefore RCP=ICP

27
Q

What bur is used to removed ceramic crown?

A

Diamond

28
Q

What bur is used to removed metal crown?

A

Tungsten-carbide

CSAR (12 decks)

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