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5th yr- Finals- CSA revision > Clinical aspects of composite, amalgam and GIC > Flashcards

Clinical aspects of composite, amalgam and GIC Flashcards

1
Q

Describe the elements that make up composite

A
  1. Matrix
  2. Fillers
  3. Coupling agents
  4. Initiators and accelerators
  5. Pigments
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2
Q

What is the resin matrix made up

A

Monomers and diluents

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3
Q

What is composite made just of rein matrix known as

A

Unfilled resin

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4
Q

Give examples of filler particles in composite

A
  1. Silica particles
  2. Quartz
  3. Glass
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5
Q

What is composite made up of resin matrix and filler particles called

A

Filled resin

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6
Q

What does the filler size of composite determine

A

Surface smoothness
larger particle size rougher the surface

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7
Q

What does an increase in filler content result in

A
  1. Increase in hardness/ strength
  2. Increase in abrasion resistance
  3. Handling
  4. Aesthetics
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8
Q

How does composite set

A

Light activated free radical reaction

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9
Q

What are the short comings of composite

A
  1. Polymerisation shrinkage
  2. Technique sensitive
  3. Doesn’t bond directly to tooth needs bonding agents
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10
Q

What can polymerisation lead to

A

Development of gaps:
1. Secondary caries
2. Staining
3. Sensitivity

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11
Q

What are the contra indication of composite

A
  1. If moisture control can’t be achieved
  2. If using eugenol
  3. Very deep restorations- may need liner
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12
Q

Why does etching do to enamel

A
  1. Creates a micro porous layer
  2. Increases surface area
  3. Increases wettability
  4. Increases surface energy
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13
Q

What does etching fo to dentine

A
  1. Removes the smear later
  2. Unblocks and ideas the dentinal orificies
  3. Exposes network of collagen
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14
Q

What does a bonding agent allow for

A

chemicals that allow composites adhere to tooth

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15
Q

What is the limited depth of cure for the blue light curers

A

2mm

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16
Q

What is dental amalgam

A

An alloy of silver mercury and tin with some other metals added to modify the properties

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17
Q

Name the metals found in amalgam

A

Silver
Tin
Mercury

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18
Q

What are the possible metal combinations of an amalgam reaction

A
  1. Ag3Sn (Gamma)
  2. Ag2Hg3 (Gamma1)
  3. Sn7Hg (Gamma2)
19
Q

What Is gamma 2 responsible for

A

Sn7Hg responsible for
1. Corrosion
2. Creep
3. Decrease in strength

20
Q

How do we reduce the amount of gamma 2

A

by adding copper to increase the content of gamma 1

21
Q

What are the benefits of amalgam

A
  1. Good compressive strength
  2. Good wear resistance
  3. Kind to opposing teeth
  4. Easy to use
  5. Chemical set
  6. Cheap
  7. Radio opaque
22
Q

What are the disadvantages of amalgam

A
  1. Non adhesive
  2. Weak in thin sections (<2mm)
  3. Thermal conductor
  4. Unaesthetic
  5. Corrodes
  6. Can lead to lichenoid type reactions
23
Q

What are the indications of amalgam

A
  1. Class 1 and class II cavities
  2. Where heavy occlusal forces are encountered
  3. Where aesthetics are not important
  4. Building up broken teeth prior to crowding
24
Q

List the cavity design needed for amalgam

A
  1. No unsupported enamel
  2. Undercut: wider at the base than at the top
  3. Cavo surface angle >90
  4. Amalgam margin angle >70
  5. Must be 2mm deep minimum
25
Q

What is the average life span of amalgam v composite

A

Amalgam: 12 yrs
Composite: 5 years

26
Q

What is the main reason for restoration failure

A

Secondary caries

27
Q

Name the 3 main types of GIC

A
  1. Traditional GIC
  2. Resin modified GIC (RMGIC)
  3. Zinc reinforced GIC
28
Q

List the benefits of GIC

A
  1. Easier to use
  2. Doesn’t need bond
  3. Tolerates moisture
  4. Chemically bonds to enamel and dentine
  5. Releases flouride
29
Q

What can we use to aid GIC renting to dentine

A

Dentine condition

30
Q

What is denine conditioner made up of

A

10% poly acrylic acid

31
Q

What is released into the cavity when a GIC is placed

A

Fluoride

32
Q

What is the main reason for GIC failure

A

Secondary caries

33
Q

What are the benefits of flouride release from GIC

A
  1. Greater caries inhibitor sen than amalgam
  2. Significantly greater caries prevention than composite
  3. Significantly fewer demineralised restoration margin in class II restorations in deciduous teeth
34
Q

What are the disadvantages of GIC

A
  1. Weaker compared to other material
  2. Poor aesthetic composited to composite
  3. Poorer survival time compared to other materials
35
Q

What are some advantages of RMGIC

A

bE

36
Q

What are the indication of GIC

A
  1. Subgingival restorations
  2. Temporary restorations
  3. Step wise excavation
37
Q

What are some advantages of RMGIC

A
  1. Better aesthetics
  2. Command set
  3. More resistant to losing ions during maturation
  4. its stronger
38
Q

What are the disadvantages of RMGIC

A
  1. Doesn’t bond to the tooth surface
  2. Doesn’t release as much flouride
  3. Polymerisation shrinkage
39
Q

For which teeth is TMGIC more commonly used

A

Anterior teeth

40
Q

What are some of the problems associated with GIC

A
  1. They are weak
  2. They fracture easily
  3. Wear is high
  4. Complicated to use
  5. Short workable time
  6. Stops acting like GIC once cured
41
Q

Give examples of zin reinforced GIC

A

Chemfil

42
Q

What are the advantages of zin reinforced GIC

A
  1. Best strength of the GICs
  2. Bonds directly to enamel and dentine
  3. No conditioning or varnish required
43
Q

What are the indications for RMGIC

A

Non loading bearing restorations
bonded amalgam

5th yr- Finals- CSA revision (19 decks)

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