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5th yr- Finals- CSA revision > Tooth coloured filling material > Flashcards

Tooth coloured filling material Flashcards

1
Q

Give examples of tooth coloured filling material

A
  1. Composite
  2. GIC
  3. RMGI
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2
Q

What is dental composite made up of

A

Inorganic filler and an organic binder

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3
Q

What are the advantages of composite

A
  1. Aesthetic
  2. Conserves tooth structure
  3. Chemically bonds to tooth
  4. Has a low thermal conductivity
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4
Q

What are the disadvantages of composite

A
  1. Technique sensitive
  2. Polymerisation shrinkage
  3. Has a decreased wear resistance
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5
Q

What can polymerisation shrinkage lead to

A
  1. Marginal leakage
  2. Secondary caries
  3. Post op sensitivity
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6
Q

How does composite set

A

Via a free radical addition polymerisation

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7
Q

Talk through the stages of a composite free radical addition polymerisation

A
  1. Activation: chemical and light
  2. Initiation
  3. Propagation
  4. Termination
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8
Q

What causes polymerisation shrinkage

A

Poor body to dentine

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9
Q

What can polymerisation shrinkage lead to

A
  1. Poor retention
  2. Staining
  3. Sensitivity
  4. Secondary caries
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10
Q

How far can the blue composite setting light travel effectively

A

2mm

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11
Q

Why are filler placed in dental composite

A

To reduce shrinkage upon curing

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12
Q

What do inorganic fillers reduce

A
  1. Polymerisation shrinkage
  2. Water absorption
  3. Thermal expansion
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13
Q

What do inorganic fillers increase

A
  1. Compressive tensile strength
  2. Modulus of elasticity
  3. Abrasion resistance
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14
Q

Why are coupling agents added to compsite

A
  1. Improve adherence of resin to filler surface
  2. Chemically coat filler surface and increase strength
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15
Q

When is flowable composite indicated

A
  1. Class V restoration
  2. Micro preparations
  3. Extended fissure sealings
  4. Adhesive cementation of ceramic restoration
  5. Blocking out cavity undercuts
  6. Initial base later
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16
Q

What are the disadvantages of flowable composite

A

Has a lower filler volume and so exhibit increased shrinkage and wear with decreased strength

17
Q

What does etch do to enamel

A

Decalcifies the enamel rods exposing the dentinal tubules

18
Q

Why do we etch enamel before composite placement

A
  1. Remove debris and surface enamel
  2. Increase surface area
  3. Increase wetting
19
Q

What does acid etching do to enamel

A
  1. Improves retention of the restoration
  2. Increases the surface area of the dentine
  3. Remices the smear layer from prep
    4,Allowes for penetration of bonding agents into dentine

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

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