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Restorative dentistry > Composite > Flashcards

Composite Flashcards

0
Q

2 major components of composite

A
  • organic polymer resin

- inorganic filler particles

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1
Q

First dental composite is a mixture of?

A
  • silicate glass

- acrylic monomer

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2
Q

Makes composite radiopaque

A

Barium glass

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3
Q

For adhesive bonding of filler to the resin

A

Coupling agent/keying agent

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4
Q

Example of coupling agent (2)

A
  • vinyl silane

- gamma methacryloxy propyl silane

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5
Q

Reduces viscosity of resin allowing easier filler incorporation

A

Diluent

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6
Q

Examples of diluent (2)

A
  • methyl methacrylate

- alipathic dimethacrylate

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7
Q

Example of catalyst

A

Benzoyl peroxide

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8
Q

An aromatic tertiary amine that initiate polymerization

A

Accelerator

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9
Q

Increases shelf life by preventing spontaneous polymerization

A

Inhibitor

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10
Q

Example of inhibitor

A

Hydro quinones

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11
Q

Initially increases rate of polymerization

A

Methacrylic acid

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12
Q

4 types of composite

A

1 conventional
2 micro-filled
3 hybrid
4 nano-filled

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13
Q

Chemically cured composite

A

Conventional composite

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14
Q

“Polishable composite”

A

Microfilled

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15
Q

Inorganic filler content of conventional composite (%)

A

70-80%

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16
Q

Inorganic filler content of micro-filled composite (%)

A

35-60%

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17
Q

Inorganic filler content of hybrid composite (%)

A

75-85%

18
Q

2 type of hybrid composite

A 
1 flowable (ampules)
2 packable (syringe)
19
Q

Diastema closure used for >2.5mm

A

Splints

20
Q

Contraindications of composite (4)

A
  • habitual bruxism
  • deep gingival prep
  • poor moisture control
  • large restoration
21
Q

The dimensional change of a material per unit change in temp

A

Linear coefficient of thermal expansion

22
Q

Properties of composite (7)

A
  • LCTE
  • water absorption
  • wear resistance
  • surface texture
  • radiopacity
  • modulus of elasticity
  • solubility
23
Q

Stiffness of the material

A

Modulus of elasticity

24
Q

Acid echant used for composite

A

37% phosphoric acid

25
Q

4 types of light curing units

A
  • quartz tungsten halogen
  • blue LED
  • argon laser
  • plasma arc
26
Q

Curing time using plasma arc curing light

A

9-10 secs

27
Q

Required distance between composite and light curing unit

A

2mm

28
Q

Used to measure the curing effectiveness of the unit

A

Radiometer

29
Q

Duration for etching (in secs)

A

15 secs

30
Q

Appearance after etching

A

Frosty appearance

31
Q

In etching, if contaminated with saliva, what do you do?

A

Re-etch for 5 secs

32
Q

White opaque appearance

A

Resin tags

33
Q

Components of bonding agent (3)

A
  • etchant
  • primer
  • adhesive
34
Q

Component of bonding agent used as adhesive

A

EDTA (ethylene diamine tetracetic acid)

36
Q

Consist of a gelatinous surface layer of coagulated protein

A

Smear layer

37
Q

Primer that penetrates demineralized dentin & bond to the collagen network or layer

A

HEMA ( hydroxyethyl methacrylate)

38
Q

HEMA + adhesive = ?

A

Wet bonding technique

39
Q

Process by which 2 or more molecules of same substance combine to form a polymer

A

Polymerization

40
Q

Energy required for optimum polymerization of composite

A

16 Joules

41
Q

Most common available light curing intentisty

A

400-600mW/cm2

42
Q

What component of ZOE will inhibit polymerization if used with composite?

A

-

43
Q

Best used for finishing and polishing composite

A

Polishing disks

45
Q

True or false: Moist tooth surface will bond more effectively than dry or very wet tooth surface

A

True

Restorative dentistry (4 decks)

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