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3rd yr- CSB- Partial dentures > Talking the talk partial dentures > Flashcards

Talking the talk partial dentures Flashcards

1
Q

Define support in terms of dentures

A

Support is resistance to vertical force directed towards the mucosa

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2
Q

Give examples of structures in the mouth that can support a denture

A
  1. Tooth
  2. Mucosa
  3. Tooth and mucosa
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3
Q

What do we call a denture supported by teeth?

A

Tooth borne

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4
Q

What do we call a denture supported by mucosa?

A

Mucosa borne

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5
Q

What do we call a denture supported by tooth and mucosa?

A

Tooth and mucosa borne

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6
Q

How can tooth support for dentures be achieved?

A

1, Adding occlusal rests

  1. Adding cingulum rests
  2. Adding incised rests and onlays
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7
Q

Name some mucosal borne dentures

A
  1. Every denture
  2. Spoon denture
  3. Transitional/colleted denture (gum stripper)
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8
Q

What is another name for the transitional denture?

A

Gum stripper (BUT DONT USE THIS NAME ON CLINIC)

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9
Q

What is a major disadvantage of transitional dentures?

A

They can trap plaque underneath the denture against the adjacent teeth

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10
Q

Define saddle

A

An edentulous region of the alveolar ridge

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11
Q

Give examples of some different types of saddles

A
  1. Bounded saddle

2. Free end saddle

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12
Q

Define bounded saddle

A

A saddle which has a tooth at each end

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13
Q

Define free end saddle

A

An edentulous area with teeth at one end

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14
Q

Define retention

A

It is the resistance to a vertical force directed away from the mucosa

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15
Q

How can retention be gained on a denture

A

By the use of clasps

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16
Q

How do claps work

A

They ‘engage undercut’ to gain retention

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17
Q

What can cause a denture to be loose?

A
  1. Lacks support
  2. Lacks retention
  3. Lacks resistance to lateral movement
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18
Q

Name the different types of clasps

A
  1. Retentive clasp

2. Reciprocated clasp

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19
Q

How does a retentive claps work?

A

As the denture moves up, the claps is forced to expand

The resistance to the claps to expansionists holds the denture in place

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20
Q

What is an undercut?

A

The area below the survey line (Line of maximum bulbosity) on a tooth

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21
Q

What is the survey line on a tooth?

A

The line of maximum bulbosity

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22
Q

Which direction can clasps approach the undercut from?

A

Can approach:

  1. Gingivally
  2. Occlusally
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23
Q

What is bracing in terms of dentures

A

Bracing is resistance to a horizontal force

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24
Q

Define reciprocation

A

It is the resistance to the specific horizontal forces generated by retentive clasps

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25
Q

Give an example of reciprocation

A

A bracing element which is in contact with the side of the tooth opposite the retentive clasps

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26
Q

What must retentive clasps always be to make a denture successful?

A

Must ALWAYS be reciprocated

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27
Q

Where is the reciprocated clasps found on a tooth?

A

On the side opposite to the retentive clasp

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28
Q

What is indirect retention

A

Resistance to rotational displacement in a tooth and mucosal borne denture

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29
Q

What is rotational displacement and what can it lead to

A

When a denture rotates around the claps usually due to sticky food pulling the denture away from the mucosa
Can lead to the denture becoming loose

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30
Q

How is indirect retention usually achieved?

A

By placing a rest on a tooth anterior to the clasp

31
Q

What is a sulcus

A

A space that has been produced between tongue/lips/cheeks and the residual alveolar ridge

32
Q

What does the functional depth of sulcus describe

A

The minimum depth of the sulcus when the muscles are contracting

33
Q

Define flanges

A

Parts of the denture which extend into the sulcus

34
Q

Where should flanges extend to?

A

Normally extend to the functional depth of the sulcus

35
Q

What is it called when flanges extend beyond the functional depth of the sulcus

A

they are over extended

36
Q

What are the problems associated with over extended flanges

A

They can cause the denture to be unstable in function

37
Q

What is it called when flanges DO NOT extend to the functional depth of the sulcus

A

They are under extended

38
Q

What are the problems associated with under extended flanges

A

They may lead to loss of suction under the denture (so loss of retention)

39
Q

What is occlusion?

A

Occlusion is the precise way in which teeth in the upper arch meet the teeth in the lower arch

40
Q

What is denture occlusal instability

A

When teeth meet incorrectly and make the denture unstable

41
Q

What is denture occlusal instability usually die to?

A

A premature contact point

42
Q

Name some components of a partial denture

A
  1. Occlusal rests
  2. Cingulum rest
  3. Clasps
  4. RPI clasping system
  5. Connectors
43
Q

Where are occlusal rests found

A

They extend upto 1/3rd across the occlusal surface of the tooth
They are usually directly down the long axis of the tooth

44
Q

Describe the shape of an occlusal rest

A

They are saucer shaped in profile

They should not interfere with occlusion

45
Q

What is the purpose of an occlusal rest?

A
  1. Give support to denture

2. Keep clasps in the correct position

46
Q

Where are cingulum rests found?

A

Down the long axis of the tooth on the cingulum

They are clear of occlusion

47
Q

What is the purpose of a cingulum rest?

A

To keep clasps in position

48
Q

What can happen if a cingulum rest isn’t postponed correctly?

A

It can start acting like an orthodontic appliance and move the tooth

49
Q

Which material is best suited to providing the framework for partial dentures

A

Cobalt chrome

50
Q

What is a problem with using cobalt chrome to make partial dentures?

A

It is quite stiff and inflexible

51
Q

How much horizontal depth of undercut do we need to engage for a cobalt chrome denture?

A

0.25mm

52
Q

How big do clasps on dentures need to be do be able to ho in and out of undercuts without distorting itself?

A

15mm long (1.5cm)

53
Q

What can happen if a clasp is stretch ed beyond its elastic limit

A

The clasp will break
OR
sit away from the tooth not providing retention

54
Q

Which clap type engages with the undercut

A

ONLY retentive as reciprocating clasp arms sit above the survey line

55
Q

What are guide planes

A

They are flat surfaces cut into enamel of teeth which are parallel to the path of insertion of a denture

56
Q

Other than cutting enamel how else can guide planes be made?

A

By adding composite to the tooth surface and cutting away the composite

57
Q

What does the RPI in RPI clasping system stand for

A

Rest
Plane
I bar

58
Q

Where is the rest found in the RPI clasping system

A

Mesial rest

59
Q

Where is the plane found in the RPI clasping system

A

Distal guide plane

60
Q

Where is the I bar found in the RPI clasping system

A

Retentive I bar clasp

61
Q

When are RPI clasping system used

A

Designed for lower free end saddles

62
Q

Why is an RPI clasp system good?

A

Gives good support, retention and reciprocation

63
Q

What are connectors?

A

Rigid components of a denture which hold all other components together

64
Q

Name the 2 types of connectors

A

Major and minor

65
Q

What are major connectors

A

They usually connect from left and right sides of a denture

66
Q

Define over extended flanges

A

Flanges that extend beyond the functional depth of the sulcus

67
Q

Define under extended flanges

A

Flanges that DO NOT extend to the functional depth of the sulcus

68
Q

What are minor connectors

A

A branch from the major connector to the various components eg claps, occlusal rests, saddles etc

69
Q

Name the classification we use to classify dentures

A

Kennedy classification

70
Q

Name the different classes found in the Kennedy classification

A

Class I
Class II
Class III
Class IV

71
Q

What is a Kennedy class I denture?

A

A bilateral free end saddle

Found on both sides of the mouth and one side of each denture is edentulous

72
Q

What is a Kennedy class II denture?

A

A unilateral free end saddle

Found on both sides of the mouth but only one denture has an edentulous side

73
Q

What is a Kennedy class III denture?

A

A bounded saddle denture (Found on both sides of the mouth and each denture has a tooth on both sides)

74
Q

What is a Kennedy class Iv denture?

A

The saddle anterior to the abutments

Denture for anterior teeth

3rd yr- CSB- Partial dentures (5 decks)

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