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CSA clinical aspects > CSA clinical aspects of resin composite > Flashcards

CSA clinical aspects of resin composite Flashcards

1
Q

Properties of resin composite?

A

tooth coloured
• strong
• hard wearing
• Relatively easy to place

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2
Q

What are the liquid components of composite?

A
  • Bis-GMA
  • TEGDMA
  • Yellow solution has foil as when light exposed  sets hard
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3
Q

What are the solid components of composite?

A

• Silica Filler >stirred into mixture >forms mouldable paste

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4
Q

What is the chemistry of resin composite?

A
  • Resin matrix = where polymerisation occurs

* Filler particles bond to resin matrix via silane coupling agent

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5
Q

What do filler particles do?

A

reduce shrinkage and make substance harder

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6
Q

What are the negatives of composite?

A
  • Polymerisation shrinkage
  • Technique sensitive
  • Highly affected by moisture
  • Doesn’t bond to tooth  Needs a bonding agent
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7
Q

What is polymerisation shrinkage?

A

• Monomers form a clinical bond to each other when set

space between them reduced as occurs

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8
Q

what helps in reducing shrinkage?

A

BisGMA and Filler particles

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9
Q

What does shrinkage cause?

A

gaps - prone to microleakage , plaque go in and recurrent caries
- sensitivity too since air reach

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10
Q

Why is moisture control needed for composite ?

A

hydrophobic
cotton wool rubber dam needed
good gingiva health so less bleeding

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11
Q

What happens when there’s areas where moisture control can’t be achieved ?

A

subgingival restoration

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12
Q

How to place composite?

A
  1. Cavity prep by drilling out caries
  2. Etch area (enamel & dentine for 15 s) > wash off acid for least 15 s
  3. Dry,don’t over dry ( for 5 seconds)
  4. Apply bond > this is what composite bonds to
  5. Light cure for 10-20 seconds
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13
Q

What does etching cause enamel to do?

A
  • etch goes down prisms in enamel and opens up gap

- incr. SA and more retentive

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14
Q

what happens when bond applied?

A

micro mechanical retention

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15
Q

What is bonding agent?

A

unfilled resin, flowable and enter pores made into enamel

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16
Q

What does composite chemically adhere to ?

A

layer of bonding agent

17
Q

What is cavity modification for composite?

A
  • must bevel edges of cavity > with bur at 45-degree angle to tooth
  • so etch & bond make more contact with more enamel prisms
18
Q

What does cavity modification for composite ensure?

A

o Avoids unsupported enamel
o Presents ends of enamel prisms for etching
o Provides larger SA to bond to
o Helps blend colour of restoration with rest of tooth

19
Q

what does etching beyond margins of cavity ensure

A

Helps in blending the restoration with the tooth

20
Q

What is process for bonding to dentine?

A

etching > priming >Bonding

21
Q

why is harder to cause retention to dentine?

A

it is wet , mix of collagen fibres and HAP

22
Q

What dissolves dentine smear layer?

A

Acid and mineral content of dentine

23
Q

What does priming do, adding HEMA bifunctional monomer solvent ?

A

has end sticks to composite & end sticks to organic materials > attract collagen fibres
•Primer pushes water out way

24
Q

don’t overdry when priming?

A

collagen fibres fall

then apply composite and light cure

25
Q

What does light curing do??

A

450-490 nM
• Limited depth of cure> only 2mm max
• cure in stages

26
Q

What is max distance to keep cure away ?

A

4mm

27
Q

How do we separate teeth?

A
  • Matrix strip & wedge

* Helps shape proximal surface

28
Q

What is best for anterior teeth separation?

A

matrix strip and wedge

29
Q

What is best for posterior teeth separation?

A

a metal matrix band

30
Q

What happens after restoration placement?

A

•Finishing >removal of excess material creating correct shape of restoration
- Polishing >abrasives to achieve a high polish

31
Q

How do we finishing ?

A

use finishing burs and abrasive discs

32
Q

How do we polish?

A

o Polishing points

o Soflex discs

33
Q

What do we use interproximal strips for ?

A
  • • Use thin strips to remove overhangs
    • Coarse/medium/fine/super fine
    • Insert, use below contact area to maintain proximal contact

CSA clinical aspects (13 decks)

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