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Occlusion for FINALS > Ideal occlusion > Flashcards

Ideal occlusion Flashcards

1
Q

Gnathological occlusion

A

Highly engineered

**

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2
Q

What is the definition of ideal occlusion (2)

A

Distribution of load in most favourable way
Workable occlusal scheme
Simple to apply these principles in practice

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3
Q

Principles of ideal occlusion (4)

A

RCP = ICP
Forces directed through the long axis of the teeth
Posterior disclusion in eccentric positions
Mutual protection

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4
Q

What does RCP = ICP mean for anterior and posterior teeth and why? (4)

A

Posterior teeth contact
Anterior teeth have light contact only
Occlusal load directed through long axis of teeth
Condyles also ‘positioned’ to distribute load into bone with minimal muscular involvement

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5
Q

People who’s RCP ≠ ICP (3)

A

Functioning in ICP requires muscular activity to position the condyle and intra articular disc.
80-90% of population have RCP ≠ ICP.
Most people function perfectly well

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6
Q

Why should forces be through long axis of teeth (4)

A 
Distributes occlusal loads favourably
Contacts on inclines results in horizontal forces
-wear
-tooth movement
-bone loss
-fracture of restorations
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7
Q

What is posterior disclusion and why is it important? (3)

A

The anterior teeth disclude the posterior teeth
Avoids lateral forces on posterior teeth
Simple to engineer
-often only one tooth contact in eccentric positions
-three contacts between mandible and skull

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8
Q

If posterior contacts do occur

  • on working side
  • on non-working side
  • in protrusion
A

WS: group function
NWS: interference (undesirable)
Protrusion: interference (undesirable)

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9
Q

What dictates movement in anterior guidance? Where would an interference occur?

A

Palatal surfaces of upper anterior teeth

An interference would occur on mesial of lower and distal of upper teeth

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10
Q

Mutual protection in ICP and excursions (2)

A

ICP: posterior protect anterior teeth
Excursions: anterior protect posterior teeth

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11
Q

Why is canine guidance good? (4)

A

Because of the morphology of the canine

  • crown:root
  • distant from hinge
  • distant from muscle
  • highly innervated
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12
Q

Class I definition

A

Lower incisor occludes at or below the upper incisor cingulum plateau

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13
Q

Class II div I definition

A

Lower incisor occludes behind the upper incisor cingulum plateau

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14
Q

Class II div 2 definition

A

Lower incisor occludes behind the upper incisor cingulum plateau
Upper central incisors are retroclined

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15
Q

Class III definition

A

Lower incisors occludes in front of the upper incisor cingulum plaeau

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16
Q

AOB definition

A

No contact on anterior teeth

17
Q

What does the ideal occlusion mean in practice? (5)

A

Look at existing occlusion: know the tooth contacts
Conforming: Don’t introduce unfavourable contacts
Reorganising: Work to the ideal Occlusion
Know RCP and ICP contacts preoperatively
Know RCP and ICP contacts postoperatively

18
Q

Movement of the mandible is dictated by

A

The position of the condyle in the fossae
Condylar pathway along the articular eminence
Teeth ‘interfere’ with this border movement

19
Q

What is the only position where the mandible can rotate about a hinge without using the lateral pterygoid muscles to brace the closing muscles

A

Centric relation

20
Q

Positive aspects of centric relation

A

The neuromuscular system can function optimally

It is repeatable

21
Q

When would you use centric relation? (5)

A 
Complete dentures
Routine restorations to check RCP
Re-organising occlusion to create new ICP coincident with RCP
For mounting models for analysis in CR
Making hard splints
22
Q

Deprogramming neuromuscular system into CR depends on (4)

A

Operator ability
Tooth mobility
Edentulous areas
Difficulty of patient

23
Q

Methods for deprogramming neuromuscular system into CR (5)

A 
Bilateral manual manipulation (Dawson technique)
Cotton wool rools
Anterior jigs (Lucia)
Gothic Arch Tracing
Flat plane splint
24
Q

Methods for recording centric relation (3)

A

Manual manipulation into wax or silicone
Anterior jug with silicone
GAT with silicone

25
Q

Verifying centric relation records (3)

A

Compare 2 or more records.
Difficult because they may be recorded at different OVD anywhere within CR
Vericheck/Centricheck

Occlusion for FINALS (5 decks)

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