4b - Occlusion for conventional dentures Flashcards

1
Q

What are the different types of record block?

A
  • wax only
  • shellac base with wax
  • heat cured base
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2
Q

What are the properties of a wax only record block?

A
  • less retentive
  • cheap
  • lots of space for setting teeth
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3
Q

What are the properties of a shellac base record block?

A
  • more stable
  • more expensive
  • limited space for setting teeth
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4
Q

What are the properties of a heat cured base?

A
  • very stable
  • expensive
  • least space for setting teeth
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5
Q

What equipment is required for a jaw registration?

A
  • heat source
  • hot plate
  • wax knife
  • foxes bite plate
  • dividers or willis bite gauge
  • bite registration paste
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6
Q

What are the steps of jaw registration?

A

1 - adjust upper for retention
2 - adjust upper for tooth position
3 - adjust upper for occlusal plane
4 - lower tooth position and jaw relationship
5 - measure vertical dimension and establish face height
6 - record registration
7 - select shade, mould and setting

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7
Q

How should you adjust a record block for retention?

A
  • not too much lip support (or else will drop)
  • trim rim labially and buccally
  • ensure no overextension
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8
Q

How should you adjust the upper record block for tooth position?

A
  • lip support
  • incisal level
  • midline
  • buccal corridor
  • occlusal plane
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9
Q

What is the recommended nasiolabial angle for lip support?

A

90 degrees (actually usually 96 degrees)

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10
Q

What should be marked on to the record block for tooth position and incisal level?

A
  • smile / lip line
  • canine line
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11
Q

What should be used as reference for the midline?

A
  • incisive papilla
  • filtrim of the lip
  • nose to some extent
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12
Q

What is the buccal corridor?

A
  • space between cheeks and teeth when smiling
  • in a small percentage of people
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13
Q

What reference points are used to adjust the occlusal plane?

A

Anterior = interpupillary
Posterior = ala tragus line

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14
Q

What is the neutral zone?

A

The area in which the forces of the lips and cheeks, and the tongue are balanced, denture should be placed here.

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15
Q

What happens if a denture is not designed within the neutral zone?

A

Too buccally - cheek movement dislodges denture
Too lingually - tongue movement dislodges denture
Lingual flange incorrect shape - tongue lifts denture

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16
Q

Define class I skeletal relationship.

A

Shallow overjet and overbite

17
Q

Define class II div 1 skeletal relationship.

A

Increased overjet and shallow overbite

18
Q

Define class II div 2 skeletal relationship.

A

Increased overjet and deeper overbite

19
Q

Define class III skeletal relationship.

A

Edge to edge incisors or reverse overjet ± posterior cross bite

20
Q

What happens when there is excessive freeway space?

A
  • reduced masticatory function
  • overclosed facial appearance
  • cheek biting
  • TMJ symptoms
21
Q

What happens when there is reduced or inadequate freeway space?

A
  • excessive load on denture bearing area
  • continuous muscular activity results in pain
  • aesthetic complaints (“teeth are too big”)
  • noisy dentures
22
Q

What is the ideal FWS?

A
  • 2-4mm
  • don’t change more than 1-2mm from patients initial FWS even if it is not in the recommend range
23
Q

How do you prepare a record block to record registration?

A
  • cut notches
  • apply adhesive if using paste