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Lernmaterialien für DMS an der University of Glasgow

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TESTE DEIN WISSEN

What are 2 disadvantages of alginate?

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TESTE DEIN WISSEN
  • Poor tear strength
  • Must be provided ASAP
    • Syneresis and inhibition with moisture
Lösung ausblenden
TESTE DEIN WISSEN

What are 5 disadvantages of GI?

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TESTE DEIN WISSEN
  • Brittle and poor wear resistance
  • Moisture susceptible when first placed
    • Most importantly during hardening phase
    • Must be water and dessication free
    • Consequences
      • Aluminum ions may leach out and therefore reducing mechanical properties
      • Saliva contamination causes excess water absorption
    • Overall, results in weak material
  • Lower compressive strength than composite (by 50%)
  • Poorer aesthetics
  • Poor handling characteristics
Lösung ausblenden
TESTE DEIN WISSEN

What is the composition of GI?

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TESTE DEIN WISSEN
  • Acid
    • Polyacrylic and tartaric acid
  • Base
    • Quartz
    • Alumina
    • Aluminium phosphate
    • Aluminium fluroide
    • Sodium fluoride
    • Calcium fluoride
  • Lithium and strotinum salts can be added to increase radiopacity but do not take part in reaction
Lösung ausblenden
TESTE DEIN WISSEN

How does bonding take place in GI?

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TESTE DEIN WISSEN
  • Carboxyl groups in cement bond to enamel
  • Hydrogen ion bonding and metallic ion bridging with collagen in enamel
Lösung ausblenden
TESTE DEIN WISSEN

What are the 7 ideal properties of denture bases/acrylics?

Lösung anzeigen
TESTE DEIN WISSEN
  • Dimensionally stable
  • Biocompatible
  • Easy/cheap to manufacture and reproduce
  • High  
    • Youngs Modulus
    • Proportional limit (elastic limit)
    • Softening temp
    • Transverse, fatigue and impact strength
    • Thermal conductivity 
    • Hardness and resistance abrasion
Lösung ausblenden
TESTE DEIN WISSEN

What are 4 elastomer impression materials?


Lösung anzeigen
TESTE DEIN WISSEN
  • Polysulphides
  • Polyether
    • Impregnum
  • Curing Silicone
    • Addition (Aquasil Ultra)
    • Non-Addition (Verone)
Lösung ausblenden
TESTE DEIN WISSEN

What are 4 faults that occur during production of heat-cured acrylic and why do they occur?

Lösung anzeigen
TESTE DEIN WISSEN
  • Under-curing
    • Too much monomer (irritant) and decrease in mechanical properties
  • Over-curing
    • Contraction porosity/polymerisation shrinkage
      • Monomer shrinks by 20%
      • Too much monomer, insufficient pressure, insufficient excess material
    • Gaseous porosity
      • Monomer boiling in bulkier parts of denture creating voids
    • Granularity 
      • Not enough monomer
    • Crazing
      • Internal stresses due to fast cooling rate
Lösung ausblenden
TESTE DEIN WISSEN

What are 3 advantages of elastomeric impressions?

Lösung anzeigen
TESTE DEIN WISSEN
  • Higher tear strength/resistance
  • Greater elastic recovery 
  • Lower visco-elasticity
  • Lower rigidity
  • Greater reproduction of surface detail
Lösung ausblenden
TESTE DEIN WISSEN

What are the constituents of PMMA?

IPPPCo MHCo

Lösung anzeigen
TESTE DEIN WISSEN
  • Powder
    • Benzoyl peroxide (initator)
    • PMMA particles (pre-polymerised beads)

    • Plasticiser (quicker dissolving in monomer liquid)

    • Co-polymer (improves mechanical properties)
    • Pigments (colour)
  • Liquid
    • Methymethacrylate monomer (polymerises)
    • Hydroquinone (inhibitor by reacting with free radicals and therefore increasing shelf life)
    • Co-polymer (improves mechanical properties)
Lösung ausblenden
TESTE DEIN WISSEN

What are 4 non-elastic impression materials?

Lösung anzeigen
TESTE DEIN WISSEN
  • Impression compound
  • Impression waxes
  • Impression plasters
  • ZOE
Lösung ausblenden
TESTE DEIN WISSEN

What are 2 advantages of alginate?

Lösung anzeigen
TESTE DEIN WISSEN
  • Relatively easy to use
  • Operator compatible
    • Can decide on working and setting time
  • Quite accurate 
    • Relatively fine detail recorded
  • Cheap
  • Non-irritant and non-toxic
Lösung ausblenden
TESTE DEIN WISSEN

What is the setting reaction of alginate?

Lösung anzeigen
TESTE DEIN WISSEN

2NanAlg + nCaSO4 ----> nNa2SO+ CanAlg


  • Sodium alginate to calcium alginate
  • Cross-linking with calcium allows alginate to set
  • Intermediate reaction between sodium to calcium delays setting
Lösung ausblenden
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Q:

What are 2 disadvantages of alginate?

A:
  • Poor tear strength
  • Must be provided ASAP
    • Syneresis and inhibition with moisture
Q:

What are 5 disadvantages of GI?

A:
  • Brittle and poor wear resistance
  • Moisture susceptible when first placed
    • Most importantly during hardening phase
    • Must be water and dessication free
    • Consequences
      • Aluminum ions may leach out and therefore reducing mechanical properties
      • Saliva contamination causes excess water absorption
    • Overall, results in weak material
  • Lower compressive strength than composite (by 50%)
  • Poorer aesthetics
  • Poor handling characteristics
Q:

What is the composition of GI?

A:
  • Acid
    • Polyacrylic and tartaric acid
  • Base
    • Quartz
    • Alumina
    • Aluminium phosphate
    • Aluminium fluroide
    • Sodium fluoride
    • Calcium fluoride
  • Lithium and strotinum salts can be added to increase radiopacity but do not take part in reaction
Q:

How does bonding take place in GI?

A:
  • Carboxyl groups in cement bond to enamel
  • Hydrogen ion bonding and metallic ion bridging with collagen in enamel
Q:

What are the 7 ideal properties of denture bases/acrylics?

A:
  • Dimensionally stable
  • Biocompatible
  • Easy/cheap to manufacture and reproduce
  • High  
    • Youngs Modulus
    • Proportional limit (elastic limit)
    • Softening temp
    • Transverse, fatigue and impact strength
    • Thermal conductivity 
    • Hardness and resistance abrasion
Mehr Karteikarten anzeigen
Q:

What are 4 elastomer impression materials?


A:
  • Polysulphides
  • Polyether
    • Impregnum
  • Curing Silicone
    • Addition (Aquasil Ultra)
    • Non-Addition (Verone)
Q:

What are 4 faults that occur during production of heat-cured acrylic and why do they occur?

A:
  • Under-curing
    • Too much monomer (irritant) and decrease in mechanical properties
  • Over-curing
    • Contraction porosity/polymerisation shrinkage
      • Monomer shrinks by 20%
      • Too much monomer, insufficient pressure, insufficient excess material
    • Gaseous porosity
      • Monomer boiling in bulkier parts of denture creating voids
    • Granularity 
      • Not enough monomer
    • Crazing
      • Internal stresses due to fast cooling rate
Q:

What are 3 advantages of elastomeric impressions?

A:
  • Higher tear strength/resistance
  • Greater elastic recovery 
  • Lower visco-elasticity
  • Lower rigidity
  • Greater reproduction of surface detail
Q:

What are the constituents of PMMA?

IPPPCo MHCo

A:
  • Powder
    • Benzoyl peroxide (initator)
    • PMMA particles (pre-polymerised beads)

    • Plasticiser (quicker dissolving in monomer liquid)

    • Co-polymer (improves mechanical properties)
    • Pigments (colour)
  • Liquid
    • Methymethacrylate monomer (polymerises)
    • Hydroquinone (inhibitor by reacting with free radicals and therefore increasing shelf life)
    • Co-polymer (improves mechanical properties)
Q:

What are 4 non-elastic impression materials?

A:
  • Impression compound
  • Impression waxes
  • Impression plasters
  • ZOE
Q:

What are 2 advantages of alginate?

A:
  • Relatively easy to use
  • Operator compatible
    • Can decide on working and setting time
  • Quite accurate 
    • Relatively fine detail recorded
  • Cheap
  • Non-irritant and non-toxic
Q:

What is the setting reaction of alginate?

A:

2NanAlg + nCaSO4 ----> nNa2SO+ CanAlg


  • Sodium alginate to calcium alginate
  • Cross-linking with calcium allows alginate to set
  • Intermediate reaction between sodium to calcium delays setting
DMS

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