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5th ACS - Occlusion > Occlusion in Restorative Dentistry > Flashcards

Occlusion in Restorative Dentistry Flashcards

1
Q

Why important to study occlusion in relation to restorative work?

A 
Failure restoration
Fractured teeth and restoration
Overeruption/tilting
Fractured crowns
Wear of teeth 
Localised periodontitis 
Facial pain
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2
Q

What teeth common see over eruption?

A

Upper molars

Often due large under contoured amalgam on lower teeth/ lack opposing teeth

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3
Q

Issue w/ overuption?

A

Create unfavourable contact in excursion = fracture

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4
Q

How avoid fracture of crowns when providing?

A

If heavy occlusion use metal backings

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5
Q

What issue of tx when have tooth wear?

A

Need increase VD - complications

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6
Q

If have large occlusal load on one tooth what are periodontal effects?

A

See funnel shaped bone loss

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7
Q

What is ICP?

A

Intercuspal position

Position of mandible when maximum intercuspation of the teeth

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8
Q

When may be hard to see ICP?

A

Loss of cusps - lost teeth/ tooth wear

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9
Q

What is RCP?

A

Related centric relation - first tooth contact when condyle fully seated in glenoid fossa

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10
Q

Relationship of ICP and RCP?

A

Don’t usually coincide - close to RCP and slide ICP

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11
Q

What want to assess in slide ICP to RPC?

A

If vertical or horizontal competent

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12
Q

What expect to see if slide RCP to ICP if no tooth wear?

A

More significant vertical component

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13
Q

What is centric relation?

A

Relation of mandible to maxilla when condyles seated midmost uppermost position in glenoid fossa
Jaw relationship nothing to do with teeth

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14
Q

Adv of CR?

A

Most optimum position neurousculature system

MoM able fully relax

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15
Q

What is range of movement within CR called?

A

Hinge movement

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16
Q

What is terminal hinge axis?

A

Condyles hinge about horizontal axis when in CR

17
Q

What terminology use to describe lateral excursion?

A

Working side

Non-working side

18
Q

Difference between working and non-working side?

A

Working side - side jaw moving to

Non-working side - opposite side jaw moving to

19
Q

What can see on working side?

A

Group or canine guidance

20
Q

What is canine guidance during lateral excursion?

A

Ideal as canine well-formed take load

Only canine in contact - disocclusion all teeth

21
Q

What happens if canine wears?

A

Guidance transferred to other teeth

22
Q

What is group function?

A

When have +1 guiding teeth during lateral excursion

Less ideal

23
Q

What expect/ideal see non-working side during lateral excursion?

A

Posterior teeth should separate to avoid destructive forces

24
Q

What movement described condyles in lateral excursion?

A

Working side = Benett movement

NWS = Benett Angle

25
Q

What is Bennett movement?

A

Shift of mandible towards working side following by rotation around vertical axis
WS condyle move lateral

26
Q

What is Bennet angle?

A

7.5 degree

NWS condyle moves down, forwards and inwards

27
Q

Briefly describe what expect see protrusive excursion in different incisor class?

A

Class I - anterior guidance
Class II div I - posterior initial, than anterior
Class II div II - heavy anterior
Class III - posterior

28
Q

What range of movement expect to see CR?

A

25mm

29
Q

How find CR?

A

Pt tongue back palate - encourage condyle seat mid-most upper most position

Dawson technique

CR manipulation

30
Q

How to do CR manipulation?

A

Stabilise head
Fingers lower border mandible, thumbs on symphysis
Manipulate jaw hinges open and closed - freely
Guide condyles up with little fingers

31
Q

Issue CR manipulation?

A

Depends pt ability to relax - use anterior jig if struggling

32
Q

Does occlusion matter when construction splint for TMJ?

A

Yes, want splint in CR for neuromuscular dissociation

33
Q

What occlusion use in complete dentures?

A

RCP =ICP

Reproducible and comfortable for pt

34
Q

What is posset envelope of movement?

A

Traces movement of mandible through extreme border movements

35
Q

What does Posselt envelope of movement record?

A

ICP and RCP - see slide
Forward movement into protrusion
Maximum protrusion
Maximum opening

36
Q

Difference posselt diagram of dentate and edentulous mouth?

A

Similar as retain border activity as limited by musculature/condyle activity
No slide RCP to ICP and RCP=ICP

5th ACS - Occlusion (6 decks)

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