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Prostho II > 4. RPD bases > Flashcards

4. RPD bases Flashcards

1
Q

What is the base of the denture?

A

Portion that supports artifical teeth, rests on foundation tissues and replaces alveolar structures

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2
Q

What do the bases of RPDs face?

A
  • foundation tissues on one side

- artifical teeth on the other side

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3
Q

What parts of the RPD replace lost structures due to edentulism? (2)

A
  • Denture teeth

- Bases

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4
Q

Functions of RPD bases? (4)

A
  • Attach the prosthetic teeth to RPD
  • Be a supporting structure of the RPD: transfer occlusal forces to abutment teeth and tooth-tissue supported RPDs, to denture foundation area
  • Replace missing alveolar tissue in volume and appearance
  • Provide bracing, retention and in tooth-tissue supported RPDs direct-indirect retention
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5
Q

Base functions: attach the prosthetic teeth - Denture teeth are…

A

Individual units that should be attached to the bases to carry out their function

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6
Q

Base functions: attach the prosthetic teeth - Types of configuration of artificial teeth and RPD bases? (3)

A
  • Teeth attached to acrylic resin in an extended base (with or without underlying meshwork)
  • teeth attached to acrylic resin that is attached directly to a metal base (Shortened base)
  • Metal occlusal surfaces
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7
Q

Base functions: attach the prosthetic teeth - which type of artificial tooth configuration is the most common?

A

Teeth attached to acrylic resin in an extended base (with or without underlying meshwork)

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8
Q

Base functions: attaching prosthetic teeth is useful because? (2)

A
  • That way the bases help indirectly in mastication, deglutition, phonation and aesthetics
  • Prevents horizontal and vertical tooth migration
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9
Q

Bases: support function for the RPD? (4)

A
  • Resistancce of denture to vertical intrusive forces
  • must be transferred homogeneously
  • transferred to teeth and/or soft tissues
  • if support is correct = less bone resorption
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10
Q

Bases function: Replace missing tissues? (3)

A
  • Alveolar tissue - both bone and mucosa
  • Restore non-tooth esthetics
  • Lip and cheek support: restore face esthetics
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11
Q

Bases function: Provide additional retention? (3)

A
  • Because of adhesion and cohesion
  • in tissue supported and tooth-tissue supported
  • Important at the mandible: no major connector provides retention
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12
Q

More contact surfaces with bases means

A

more retention

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13
Q

Bases function: How do they provide stability?

A

Also thanks to teeth

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14
Q

Bases need to be strong enough to resist … (5)

A
  • Stresses which will be applied to it with the use of a thin base
  • Have to bear forces and have adequate thickness
  • fracture (toughness)
  • deformation (Deformation)
  • abrasion
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15
Q

Bases should be asethetic… (3)

A
  • Specially at the anterior region
  • smooth and polished surface
  • non absorbent
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16
Q

Bases and hygiene? (2)

A
  • Should not harbor microorganisms

- metal bases are the most hygenic

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17
Q

Why should bases be capable of adapting to supporting tissues ?

A

Improves retention by adhesion and cohesion

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18
Q

Bases and thermal conductivity?

A

Should be good thermal conductors

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19
Q

What should the weight for the bases be? (2)

A
  • Low weight for the upper denture

- High weight for the lower one

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20
Q

Bases should be able to chemically …

A

bond to prosthetic tooth materials and RPD allows

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21
Q

length (extension) of base is determined by? (2)

A
  • Number of missing teeth

- Retention, support and stability

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22
Q

Volume of the base will be determined by? (3)

A
  • prosthetic space available
  • amount of supporting tissue lost
  • relationship between edentulous ridge and opposing arch
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23
Q

What are the types of base extensions? (3)

A
  • Extended bases
  • Reduced bases
  • Shortened bases
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24
Q

What is an extended base?

A
  • extension similar to complete dentures
25
Q

Where is the extended bases border?

A

up to the functional boundary

26
Q

Extended bases seek to achieve…

A

border seal

27
Q

Extended bases materials? (2)

A
  • Acrylic resin

- with or without underlying framework

28
Q

Advantages of extended bases? (4)

A
  • Provide great support
  • Spread the forces over more syrface
  • Improve rention
  • Easy reline
29
Q

Disadvantages of extended bases? (2)

A

Very bulky: less comfortable and physiologic rejection

Less masticatory proprioception: b/c large extension & low thermal conductivity

30
Q

Extended bases can join the rest of the denture by…

A

Metal frameworks

31
Q

Extended bases: framework doesn’t extend up to …

A

The border of the base?

32
Q

What are the types of designs for extended bases? (3)

A
  • Fishbone
  • Ladder
  • Mesh
33
Q

What type of extended base design is less bulky than ladder base?

A

Mesh

34
Q

Extended bases indications? (2)

A
  • Great support and retention needed

- Great amount of lost tissue to restore

35
Q

What kennedy classes use extended bases? (3)

A
  • Class I and II esp with long free-ended edentulous areas
  • Class III at the mandible with long span space and weak abutment teeth
  • Class IV with great bone loss
  • Tissue supported RPDs
36
Q

How many flaps do reduced bases?

A

2

37
Q

What is a buccal flap? (3)

A
  • On the reduced base
  • Acrylic resin
  • Up to functional limit but shorter than in extended bases
38
Q

What is a lingual flap? (3)

A
  • On the reduced base
  • Metal
  • Continues with major connector
39
Q

Reduced bases are the junction between framework and acrylic resin by…

A

retentive devices

40
Q

Reduced bases: There is still acrylic resin covering the…

A

Residual ridge at buccal aspect and top of ridge

41
Q

Reduced base: Why is the lingual flap made of metal?

A

Generally has less resorption

42
Q

Reduced bases: What type of surface is at the junction of material?

A

Even surface at the junction of materials

43
Q

Reduced bases: framework is usually part of the _______ & ______ together

A

Major connector and cast

44
Q

Reduced base advantage? (4)

A
  • Structural strength
  • More comfortable
  • Generally produce fewer ulcers
  • Provide good support, retention and stability
45
Q

Reduced bases disadvantages? (3)

A
  • Transmit more load to the remaining teeth
  • Press mucosa more
  • More difficult retouches (due to metal part)
46
Q

Reduced base indications?

A

Need for support and stability of denture but good anatomical situation

47
Q

What kennedys classes do we use for a reduced base?

A

All

48
Q

When do we use a reduced base for kennedy class I?

A

Esp at maxilla with short span edentulous areas

49
Q

When do we use a reduced base for kennedy class II ?

A

Esp at maxilla with short span edentulous areas

50
Q

When do we use a reduced base for kennedy class III?

A
  • alveolar ridge loss

- unsuitable abutment teeth

51
Q

When do we use a reduced base for kennedy class IV?

A
  • alveolar ridge loss

- unsuitable abutment teeth

52
Q

Why cant we use a reduced base with unsuitable abutment teeth?

A

They need more support and stability

53
Q

Shortened bases characteristics? (4)

A
  • Only cover the top of the ridge
  • Saddle shape
  • With retention pins for denture teeth
  • Fully metallic to comply with mechanical requirements
54
Q

Advantages of shortened bases? (4)

A
  • Comfortable b/c reduced volume
  • Good esthetics b/c no acrylic to mimic gingiva
  • Hygienic
  • Good health preservation of attached gingiva because of low coverage
55
Q

Shortened bases disadvantages? (3)

A
  • Dont provide support to the denture: Need strong abutment teeth
  • Dont provide additional retention or stability
56
Q

Shortened bases indications?

A
  • Typical of tooth supported RPDs (but not always)

- For every edentulous area of only 1 tooth that implies a modification of any kennedys class

57
Q

What kennedys classes do we use for shortened bases? (2)

A

Class III and class IV

58
Q

When do we use a shortened bases for a kennedy class IV?

A

Class IV with little bone loss

59
Q

When do we use a shortened bases for a kennedy class III?

A

Class III with short edentulous areas (1-2 teeth)

Prostho II (12 decks)

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