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CSA clinical aspects > CSA clinical aspects of GIC > Flashcards

CSA clinical aspects of GIC Flashcards

1
Q

What is traditional glass ionomer cement?

A

powder Calcium-Fluoro-Alumino-Silicate Glass and Poly Alkenoic acid.

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2
Q

What is most common polyalkenoic acid?

A

polyacrylic acid , as well as polymaleic and polyitaconic acid

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3
Q

What are all polyalkenoic acids?

A

Long hydrocarbon chain backbone

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4
Q

What does Glass contain?

A

calcium fluoride and aluminium fluoride can be displaced in acid

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5
Q

What is the setting reaction?

A
  • water added to powdered glass and poly acid, paste is created
  • takes several hours to reach its final strength.
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6
Q

What are 3 phases to setting reaction?

A

dissolution
gelation
hardening

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7
Q

What is dissolution ?

A

H20 added to dry components, H+ liberated from COOH groups on polyacid chains

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8
Q

What happens when H+ ions in dissolution come into contact with glass particles?

A

attack glass causing Ca, Al, F, ions to be released from glass and go into solution

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9
Q

What is process of gelation?

A
  • Ca2+/Al3+ attracted to negatively charged carboxyl groups on acid chains.
  • causes chains to link together.
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10
Q

What is process of hardening?

A

up to a week before material reaches final hardness and several months before full maturation.

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11
Q

Why must traditional GIC protected by layer of varnish for first week?

A

materials prone to lose ions not yet reacted with acid chains if restoration gets too wet –ions leak out into saliva and material never reach a good strength.

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12
Q

What are fluoride ions from CaF and AlF remain as?

A

unreacted and move through material into surrounding tooth

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13
Q

What does unreacted Fluoride impart?

A

anticariogenic effect on enamel and dentine adjacent to GIC

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14
Q

What is fluoride recharge?

A

New fluoride enter GIC from toothpaste and topical fluoride application

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15
Q

Is amount of fluoride release from GIC enough ?

A

doesn’t prevent caries in high risk or reverese deep carious lesions after formed

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16
Q

How do GIC bond to teeth?

A

adhere directly to enamel and dentine without need for a bonding agent.

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17
Q

Do gic bond stronger to enamel or dentine?

A

ENAMEL since more min. content here

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18
Q

What is freshly cut tooth surface covered by ?

A

smear layer- loosely bound debris GIC would bond weakly,

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19
Q

How to remove smear layer?

A

using polyacrylic acid prior to placement of the GIC.

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20
Q

What does polyacrylic acid do?

A

doesn’t etch dentine leaving exposed collagen fibres, removes smear leaving a clean dentine surface.

21
Q

Are GIC water based?

A

tolerate wet enviro. compared to composites

22
Q

Why is GIC used for subginigival restorations?

A

tolerate wetter enivro. but can’t bond to a tooth wet with saliva or blood

23
Q

What does tradiotional glass ionomer not have?

A

translucency, surface polish or good shade match so use composites

24
Q

Where is GIC used

A

Anteriorly

25
Q

What are the advantages of traditional GIC?

A
  • chemical adhesion to tooth,
  • ability to bond where moisture control for composite cannot be achieved
  • release of fluoride.
26
Q

What are main disadvantages of GIC?

A
  • aesthetics being not as good

- strength not as good as composite or amalgam

27
Q

What was the 1985 silver cermet?

A

addition of amalgam powder (AG3SN) to GIC before mixing it.

28
Q

What was the RESIN MODIFIED GIC?

A

HEMA to GIC, or grafting polymerisable groups to the poly acid chains,

29
Q

Advantages of RMGIC?

A
  • stronger, sets on command (light curing) and more resistant to losing Al and Ca ions during hardening .
  • improved aesthetics and translucency.
30
Q

What does resin mattrix formed not allow?

A

much ion movement so no varnish protection no ions can be lost.

31
Q

What is biggest disadvantage of RMGIC?

A

fluoride ions cannot move so freely either,

32
Q

Cna GIC set chemically in absecnce of light?

A

yes

33
Q

Can RMGIC be light cured?

A

yes would speed up but eventually fully set chemically, so used for bonding amalgam which not allow light reach material.

34
Q

What is the 2012 zinc reinforcement ?

A

substitution of Ca ions with Zinc ions.

- resulting material is stronger, more wear resistant and higher fracture toughness than all other types of GIC

35
Q

What do 50% of GIC fail?

A

secondary caries

36
Q

When is GIC used in cavities when no other material usable ?

A

patients with limited opening, difficult access, not able to properly dry, quick fix when patient is anxious.

37
Q

What is life expectancy of GIC like compared to amalgam and composite ?

A

SHORTER

38
Q

Cavity prep for GIC?

A

REMOVE smear layer

- brush 10% polyacrylic acid to surfaces of cavity for 10 seconds, rinse well and drying for 10 seconds.

39
Q

What should cavity be like for gic since it doesnt flow well?

A

smooth surfaced cavity with slow speed bur

DO NOT BEVEL

40
Q

How does capsule come with GIC?

A

correct amounts of powder and water

41
Q

How is GIC placed?

A

directly using matrix strip or band to prevent overhangs interproximally

42
Q

why not to use metal matrix band with GIC

A

can adhere firmly to metal and pulled out cavity when band removed.

43
Q

Why do we need to work quick with GIC?

A

SETTING STARTS AFTER MIXING

44
Q

how do we need to feel if material is sluggish?

A

don’t use instruments as fractures within material and pulling away from cavity walls.

45
Q

What do we coat gic with?

A

resin bond (Optibond solo is fine) and light cure.

46
Q

What is prep for RMGIC?

A

shape as you would for composite.

  • Delay light curing
  • restoration can be finished and polished immediately after
  • No moisture protection is required.
47
Q

What are clinical indications for traditional GIC?

A 
•	Cavities extending below the CEJ
•	Temporisation (DURING)
Endodontics
•	Caries Management
•	Stepwise excavation
•	Paediatric restorations
•	Luting Cement for crowns
- Fissure sealant
48
Q

What are clinical indications for RMGIC?

A

• Cavities extending below the CEJ

-• Lining / Bonded amalgam

49
Q

Why should RMGIC not be used for dentine bonded crowns or cementing posts?

A

expansion during setting that could fracture restoration or tooth

CSA clinical aspects (13 decks)

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