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DMT > Denture soft liners > Flashcards

Denture soft liners Flashcards

1
Q

List the 2 main types of denture liners

A

Temporary soft liners (tissue conditioners)

Permanent soft liners

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2
Q

Difference between tissue conditioners and temporary soft liners?

A

Tissue conditioners = useful for days

Temporary soft liners = useful for weeks

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3
Q

Indications for use of temporary soft liners/tissue conditioners

A

Temporary support to aid wound healing/traumatised tissue
Improve fit of ill fitting denture
Diagnostic aid - functional impression

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4
Q

Requirements for temporary liners

a) viscosity
b) elasticity
c) soft/hard

A

a) Initial flow on seating in mouth
b) elastic for cushioning but plastic for functional impression
c) soft when set

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5
Q

Why are temporary liners only temporary?

A

harden after a few days as solvent and plasticizer leach out

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6
Q

Advantages of tissue conditioners/temporary liners

A

Chair-side procedure

Initially soft

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7
Q

Disadvantages of tissue conditioners/temporary liners

A

Harden - need replacing regularly
Become highly distorted due to flow (denture fit becomes worse)
Difficult to control thickness so may be uncomfortable
Difficult to clean

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8
Q

Indications for permanent soft liners?

A 
Pain during mastication while wearing denture 
Aid retention (engage undercuts)
Obturators - used when hard and/or soft tissues have been removed = fill space
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9
Q

Requirements of permanent soft denture liners (6)

A 
Biocompatible
Permanently soft
Adhere to denture base
Durable
Easy to clean 
Elastic
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10
Q

List 2 types of permanent soft liners

A

Acrylic based

Silicone based

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11
Q

Properties of permanent soft denture liners

A

Initial softness

Softness on ageing

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12
Q

Difference between silicone and acrylic permanent soft liners (properties)

A

Silicones remain soft

Acrylics harden

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13
Q

Effect of oxygenating cleansers of denture liners

A

Cause surface pitting - should be avoided

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14
Q

Advice on cleaning dentures with soft liners with toothpaste

A

Care required

Acrylics suffer abrasion
Silicones can debond

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15
Q

Retarded elastic vs elastic

A 
Elastic = recovery is immediate
Retarded = visco-elastic = recovery occurs over time
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16
Q

Elastic properties of silicone and acrylic soft lienrs

A 
Silicone = elastic
Acrylics = viscoelastic
17
Q

Effect of liner addition to denture base

A

Some of the denture base must be removed = thinner = reduced strength = denture fracture

18
Q

Advantages of permanent soft liners

A

Pain relief

Allow denture wear

19
Q

Disadvantages of permanent soft liners

A 
Not permanent
Difficult lab procedure
Weaken base
Suspect bonding
Difficult to clean

DMT (11 decks)

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