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3rd yr- CSB- prosthodontics labs > Lab 3- denture design part 1 > Flashcards

Lab 3- denture design part 1 Flashcards

1
Q

Name the stages of designing a denture

A
  1. Saddle
  2. Support
  3. Retention
  4. Reciprocation
    (5. Guide planes)
  5. Connectors
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2
Q

What is the first thing you do when you are designing a denture

A

Outline the saddles

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3
Q

After outlining the saddles what do we need to identify

A

Is the denture:
tooth borne
tissue borne
or both

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4
Q

If the tooth is tooth borne what do we need to highlight on our design sheet

A

Occlusal rest

Cingulum rests

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5
Q

Where do we position on the rests on a bounded saddle

A

Use the nearest abutment tooth to the saddle

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6
Q

For a LOWER free end saddle where do we position the rest?

A

We use the furthest side of the abutment tooth

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7
Q

When placing our rests what do we need to consider

A

The occlusion - make sure occlusal rests don’t interfere with the occlusion

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8
Q

What can happen if a cingulum rest is sloping

A

It can have a tendency to push the tooth forwards

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9
Q

How do we want to place a cingulum rest

A

We want the rest seat to be perpendicular to the long axis of the tooth

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10
Q

How do we prep the tooth so that the cingulum rest is perpendicular to the long axis of the tooth

A

We can add composite onto the cingulum to ensure that the rest will be perpendicular to the long axis of the tooth

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11
Q

What does perpendicular mean

A

90 degree angle to

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12
Q

Why do we want the cingulum rest to be perpendicular to the long axis of the tooth

A

So that lateral force is directed downwards and doesn’t move the tooth from its original position

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13
Q

How can we add retention to a partial denture

A
  1. Clasps
  2. Adhesion/ cohesion of saliva
  3. Friction
  4. Accessory retention such as magnets
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14
Q

What do clasps require

A

Undercuts

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15
Q

how do we identify where undercuts are on a tooth

A

By surveying

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16
Q

What do we mark the survey line with

A

The SIDE of the surveyer lead

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17
Q

How do we orientate the lead when using the surveyor

A

We make sure the lead is perpendicular to the direction sticky food will pull the denture

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18
Q

What is a surveryer

A

A mechanical device that is used to identify where tissue and tooth undercuts are in the oral mucosa

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19
Q

What are surveyors used for

A
  1. Identifying undercuts for clasps

2. Identifying a path of insertion

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20
Q

What is the path of withdrawal?

A

The direction that sticky food pulls

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21
Q

How do we measure the horizontal depth of an undercut

A

Using pre measured gauges

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22
Q

List some materials we can use to make clasps

A

Cobalt chrome
Stainless steel
Gold

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23
Q

How much horizontal depth is needed for a cobalt chrome clasp

A

0.25mm

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24
Q

How much the horizontal depths needed for a Stainless steel clasp

A

0.5mm

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25
Q

How much the horizontal depth is needed for a Gold clasp

A

0.75mm

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26
Q

Why does cobalt chrome need less undercut

A

As it has a lower modulus of elasticity (it is stiffer) so needs less undercut

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27
Q

How can clasps approach the tooth

A
  1. Occlusally

2. Gingivally

28
Q

Give examples of occlusally approaching clasps

A
  1. 3 arm clasps

2. Ring clasps

29
Q

Give examples of gingivally approaching clasps

A

I bar

30
Q

Name the 3 parts of a 3 arm clasp

A
  1. Retentive arm
  2. Reciprocal arm
  3. Occlusal rest
31
Q

Where does the retentive arm go

A

Into the undercut so below the survey line

first 2/3 will be above the undercut and terminal 1/3 in undercut

32
Q

Where does the reciprocal arm go

A

Above the survey line

33
Q

Do we put 3 arm clasps on a molar

A

no as the clasp is too short

34
Q

How long does the retentive arm need to be

A

15mm

35
Q

What can happen If the retentive arm is too short

A

The material will stretch beyond its elastic limit and break

36
Q

What are the advantages of gingivally approaching clasps

A
  1. More aesthetic
  2. Can be made longer than occlusal approaching clasps
  3. Can be used for pre molars and canines
37
Q

What are the disadvantages of gingivally approaching clasps

A
  1. More damaging to periodontal health

2. Non undercut buccal surface may need to be built up first with composite

38
Q

How can we manipulate undercuts

A

By adding composite (this can add or remove undercuts)

39
Q

What happens to a patients smile/lip line as you get older

A

Lip line get lower so you can see more of the lower teeth

40
Q

Ideally which teeth do we want to clasp

A

The closet teeth to the saddle

41
Q

How many claps will give us maximum retention

A

One clasp on either end of the saddle (2 in total)

42
Q

Other than saddles what else do we need to support

A

Extra components such as rests placed on teeth away from the saddle

43
Q

What factors do we consider when choosing a clasp

A

Depends on:

  1. Undercuts
  2. Aesthetic demand
44
Q

For molars what type of clasp do we sully choose?

A

Occlusally approaching clasps

45
Q

Why do we choose occlusal approaching clasps for molars?

A

As they can be long enough and dont cover and gingival margins

46
Q

For premolars what type of clasp do we choose?

A

Gingival approaching eg I bat

47
Q

Why do we choose occlusal approaching clasps for molars?

A

They are long enough and more aesthetic

48
Q

For premolars what type of clasp do we sully choose?

A

Gingival approaching eg I bat

49
Q

Why do we choose Gingival approaching clasps for canines?

A

They are long enough and more aesthetic

50
Q

What is the path of withdrawal

A

The direction sticky toffee wants to pull the denture

51
Q

What is bracing

A

Resistance to lateral movement

52
Q

List some potential functions of a connector

A
  1. To join one or more saddles together
  2. To provide rigidity to the design
  3. To provide support
  4. To provide bracing
53
Q

List the major connectors we can use in the lower arch

A
  1. Lingual bar
  2. Sub lingual bar
  3. Lingual plate
  4. Dental bar
  5. Buccal bar
54
Q

List the major connectors we can use in the UPPER arch

A
  1. Plate
  2. Post, middle and anterior bar
  3. Horeshoe
  4. Ring
55
Q

Name the most common major connector we use in the lower arch

A

Lingual bar

56
Q

What is a lingual bar made from

A

A prefabricated blank pattern

57
Q

What are the disadvantages of a lingual bar

A

Offers no support or direct retention

58
Q

What do we need to ensure we have before placing a lingual bar

A

Need minimum of 4mmx2mm to have sufficient rigidity

3mm gingival Clarence needed + 4mm height of bar

59
Q

How much space do we need vertically to place a lingual bar

A

At least 7mm

60
Q

What do we need to ensure we have before placing a sublingual bar

A

4mmx2mm

3mm gingival Clarence and 2mm height

61
Q

How much space do we need vertically to place a sublingual bar

A

5mm

62
Q

What are the disadvantages of a sub lingual bar

A

Offers no support or retention

Needs careful impression technique!!!

63
Q

What is better sublingual or lingual bar

A

Sub lingual as they sit more comfortably in the patients mouth

64
Q

What is an advantage of a lingual plate

A

Give support and indirect retention

65
Q

What is an disadvantage of a lingual plate

A

Gingival coverage is detrimental to oral health

Needs to be supported by teeth at both ends

3rd yr- CSB- prosthodontics labs (9 decks)

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