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4th yr- CAD- Complete dentures > Copy dentures and relines > Flashcards

Copy dentures and relines Flashcards

1
Q

What is a soft lining

A

A soft cushioned lining inside the denture to stop pressure points and make eating more comfortable

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2
Q

What are the indications for a resilient lining material (soft lining)

A
  1. Patient experiences persistent pain under denture
  2. To reduce pain during function
  3. Previous positive experience of a soft lining
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3
Q

What might cause pain during function

A
  1. Sharp bony ridges
  2. Superficial mental nerve
  3. Thin atrophic mucosa
  4. Parafunctional habits
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4
Q

What material can we use for soft linings

A
  1. Silicone materials

2. Acrylic materials

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5
Q

Which is better silicone or acrylic for a soft lining

A

Both have their advantages and disadvantages but silicone is preferred

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6
Q

What do silicone materials for soft linings contain

A
  1. Poly dimethyl siloxane
  2. Silica filler
  3. Plasticizer
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7
Q

Give advantages of using a silicone material for soft linings

A
  1. Material is elastic so deforms under load
  2. Silicone is inert
  3. Feels soft to patient when 2mm thick
  4. Remains soft forever
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8
Q

Give disadvantages of using a silicone material for soft linings

A
  1. Need special burs when adjusting
  2. Prone to colonisation with candidia as its porous
  3. Requires an adhesive to glue to denture as its inert
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9
Q

What is acrylic material for soft lining made up

A

Powder and liquid

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10
Q

Give advantages of using a ACRYLIC material for soft linings

A
  1. Bonds well to denture base

2. Is soft due to plasticisers

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11
Q

Give disadvantages of using a ACRYLIC material for soft linings

A
  1. Plasticisers leach out in time leaving the material to harden
  2. Doesn’t feel as soft to the patient as silicone does
  3. Is visco-elastic meaning it takes time to soften
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12
Q

What is the minimum thickness needle for an acrylic vs silicone lining

A

Acrylic: 2-3mm
Silicone: 2mm

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13
Q

What is the what is the compliance (softness) of an acrylic vs silicone lining

A

Acrylic: softness decreases with time
Silicone: soft forever

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14
Q

What is the glass transition temperature of an acrylic vs silicone lining

A

Acrylic: 20-30 degrees when new
Silicone: -130 degrees

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15
Q

What is the bone to denture base like of an acrylic vs silicone lining

A

Acrylic: good binding
Silicone: requires a bonding agent

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16
Q

What is the surface finish like of an acrylic vs silicone lining

A

Acrylic: good
Silicone: poor

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17
Q

What do we mean by glass transition temperature

A

The temperature when a material becomes rigid and hard

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18
Q

How long do chariside soft reline materials last

A

3-6 months at most

19
Q

How long do lab soft reline materials last

A

1-3 yrs

20
Q

Other than patient comfort when else might we use soft liners

A
  1. Used in undercuts in tuberosity areas

2. Used as an obturator

21
Q

When do we carry out a reline

A

If a denture becomes ill fitting due to the change in the shoe of the tissues over time

22
Q

What is a reline

A

Making the denture fit again by relining it with material

23
Q

What can we use to reline a denture

A

Can use hard setting or soft but we usually use acrylic

24
Q

What are the problems associated with a chair side hard reline of an upper denture

A
  1. The hard lining can make the palate thicker
  2. Can increase OVD
  3. Exothermic polymerisation
  4. Monomers can be irritant / allergenic
  5. Destroy post dam which can reduce retention
  6. Chair line may not be fully cures as lab materials
25
Q

What are the advantages of making a chair side hard reline

A
  1. Immediate result

2. Few states fro errors to creep in

26
Q

What are the disadvantages of making a chair side hard reline

A
  1. Inferior physical and mechanical properties
  2. Monomer
  3. Reline material may lock into undercuts of a partial denture
27
Q

How do we carry out a laboratory reline

A
  1. An impression is taken when denture is in situ
  2. Light bodies silicone wash placed inside the denture
  3. Impression sent lab where model is cast and heated cured acrylic reline carries out
28
Q

What are the advantages of making a lab made hard reline

A
  1. Good physical and mechanical properties

2. Rebasing is possible

29
Q

What are the disadvantages of making a lab made hard reline

A
  1. Patient needs to be without denture for a few days

2. Errors can creep in due to impression taking

30
Q

What material can we use for a hard reline

A

Tokuso

31
Q

What material can we use for a soft reline

A

Coe soft

32
Q

How do we carry out a chair side hard reline

A
  1. Apply rebase aid
  2. Mix material
  3. Place over fitting surface
  4. Insert into mouth and ask the paint to bite together
33
Q

What are the indications for a chair side hard reline

A
  1. Previous dentures are satisfactory but just ill fitting due to bone resorption
  2. New denture satisfactory occlusion and neutral zone but unstable or unretentive
34
Q

What are tissue conditioners used for

A

They can odder instant improvement in fit of denture and relief of pain but they only last for a week

35
Q

Describe the composition of tissue conditioner materials

A
  1. Powder acrylic beads

2. Liquid ethyl alcohol

36
Q

what is ethyl alcohol

A

A plasticzer

37
Q

Talk through the properties of temporary resilient lining materials

A
  1. Initial plastic flow
  2. Very soft but rapidly degrades
  3. Short term 1-2 weeks
38
Q

When might we use a tissue conditioner

A
  1. To offer temporary relief from pain
  2. To help diagnose cause of pain
  3. to see if permanent soft lining would benefit
  4. Temporary improvement in fit of denture while new ones are being made
39
Q

What is a copy denture

A

It is a duplicate or replica od a denture that attempts to reproduce the aspects of a patients denture that are good while improving certain aspects which we are dissatisfied with

40
Q

Why do we make copy dentures

A

Faster than going through all the steps of making a denture

41
Q

How do we make a copy denture

A
  1. Mould made of existing denture
  2. Wax acrylic replica constructed by lab
  3. Occlusion recorded
  4. Put on articulator and set up teeth for wax try in
  5. Try in
  6. Talk was impression and prices to fit
42
Q

What are the advantages of copy dentures

A
  1. Shape of denture very similar to previous denture
  2. Time saving
  3. Fewer clinical stages
  4. Fewer impressions required
  5. Appearance can be maintained
43
Q

What are the indications for a copy denture

A
  1. Older patients
  2. Patient who have worn their denture for many years
  3. Patent with problems in adapting to new dentures
44
Q

What are the contraindication for a copy denture

A
  1. Previous denture is unsatisfactory

2. Previous denture has multiple defects

4th yr- CAD- Complete dentures (3 decks)

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