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4th Yr - CAD > Relines and copy dentures > Flashcards

Relines and copy dentures Flashcards

1
Q

soft linings ?

A

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

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2
Q

what are some indications of soft linings ?

A
  • Persistent pain under denture
  • Reduction of pain during function
  • Sharp bony ridges
  • Superficial mental nerve
  • Thin atrophic mucosa
  • Parafunctional habits
  • Previous positive experience of resilient linings
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3
Q

what are the 2 different families of materials we use for soft linings?

A
  • silicone
  • acrylic
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4
Q

what is the chemistry of silicone materials ?

A
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5
Q

pros and cons of silicone

A
  • Feel softer to the patient when 2mm thick
  • Material is ‘Elastic’ – instantly deforms
    under load
  • Remain soft forever
  • Need special burs when adjusting

cons
* Silicone is inert and requires an adhesive
to glue it to the denture
* Prone to colonization with Candida due to porous property
- last yr or 2

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6
Q

describe acrylic ?

A

feeling

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7
Q

pros and cons of acrylic ?

A
  • Being acrylic they bond well to the denture base
  • They get their softness due to the inclusion of plasticisers
  • Plasticisers ‘Leach out’ in time leaving the
    material hard
  • Don’t feel as soft to the patient as silicone due to being visco-elastic (takes time to deform)
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8
Q

properties of acrylic and silicone

A
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9
Q

what are some further uses of soft linings ?

A
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10
Q

copy denture?

A

“A copy denture is a duplicate or
replica of a denture that attempts to
reproduce those aspects of a patient’s
denture that the patient is satisfied
with, while selectively improving those
aspects with which the patient and
clinician have been dissatisfied.’’

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11
Q

how do we make a copy centre ?

A
  • make mould of existing denture
  • lab turn it into wax/ acrylic replica of pts original denture
  • us them in pts mouth and record occlusion
  • then send to lab and they will replace wax teeth with actual teeth
  • we try it in and then take a wash impression
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12
Q

pros and cons of copy dentures ?

A
  • Shape of denture very similar to previous denture
  • Patient’s adapt to new dentures more easily
  • Time saving
  • Fewer clinical stages
  • Fewer impressions required only wash
  • Impression more tolerable than 1° / 2°
  • Appearance can be maintained
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13
Q

indications for copy dentures ?

A
  • Patients who have worn the same set for many years
  • Older patients
  • Patients with problems adapting to new dentures – when an older set
    has previously been satisfactory
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14
Q

contraindications for copy dentures ?

A

Previous dentures unsatisfactory:
* Teeth not in the neutral zone
* Multiple defects

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15
Q

when do we use a reline ?

A

when denture no longer fits in mouth this can be due to bone shrinking away

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16
Q

what is a reline ?

A

If a denture becomes ill fitting due to the change in the shape of the tissues beneath over time, they can be relined to make them fit again

17
Q

what materials do we use for relines

A

Materials we use can be hard setting or soft
Usually Acrylics
Can be done at chairside or in the lab ( pt without denture for some time ) can be hard or soft

18
Q

what is a reline?

A
  • chair side
  • hard or soft
  • permanent addition to their denture
  • we use acrylic material (hard0 or soft material (soft)
19
Q

what are some problem associated with chair side hard reline ?

A

Problems – largely with upper dentures
* Can increase OVD – especially when relining upper denture
* Increases thickness of palate= tongue may stick out more
* Exothermic polymerisation
* Monomers can be irritant / allergenic
* Destroys post-dam – retention may not be ideal
* Reline materials not as fully cured as lab materials

20
Q

how do we do a lab reline ?

A
  • Impression taken with denture in situ (closed mouth technique)
  • Light bodied silicone used
  • Sent to lab where model is cast and heat cured acrylic reline carried out
21
Q

what else can we do instead of lab reline ?

A

lab rebase
* Whole of fitting surface is removed and replaced – can only be done in
the lab
* No increase in OVD
* No thickening of palate
* Can include a new post dam

22
Q

relining/ rebasing chairside pros and cons?

A

Advantages
* Immediate result
* Fewer stages for errors to creep in

Disadvantages
* Inferior physical & mechanical properties
* Monomer
* For partial dentures, reline material may lock into undercuts or in between standing
teeth

23
Q

relining rebasing lab pros and cons

A

Advantages
* Good physical & mechanical properties
* Rebasing possible = can get post dam, and thin palate

Disadvantages
* Patient without denture for some time
* Errors may creep in due to impression taking, model pouring, flasking etc
* If heat is used to polymerise the lining, the existing base material may warp

24
Q

indications for chair side hard reline

A
  • for lower dentures :
  • Previous dentures very satisfactory, but now ill fitting due to bone
    resorption
  • New dentures satisfactory occlusion and neutral zone but unstable or
    unretentive
25
Q

summary

A
26
Q

what are tissue conditioners ?

A

Quick procedure, can offer
instant improvement in fit and relief of pain

lasts for a week
acts as a soft liner

27
Q

describe the tissue conditioner reaction

A

Composition
* Powder
* Acrylic beads
* usually higher methacrylates
e.g. poly (ethyl methacrylate)
* Liquid
* Ethyl alcohol
* Plasticizer
Setting mechanism
* Gelation – no chemical reaction
occurs

28
Q

uses of tissue conditioner

A
  • To offer temporary relief from pain
  • To help diagnose cause of pain
  • To see if permanent soft lining would be of benefit
  • Temporary improvement in fit of denture while new ones are being
    made
29
Q

properties of tissue conditioners

A
  • Initial plastic flow
  • Very soft – but
    degrades rapidly
  • Only useful for 1 to 2
    weeks
  • Easily dislodged during
    cleaning

4th Yr - CAD (11 decks)

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