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OPEDENT > 14. Composite > Flashcards

14. Composite Flashcards

1
Q

a mixture of silicate glass particles with an acrylic monomer that is polymerized during the application

A

DENTAL COMPOSITES

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2
Q

DENTAL COMPOSITES has (3) phases, what are those?

A

o Organic Resin Matrix
o Inorganic Fillers
o Coupling Agent

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3
Q

High Molecular Weight Resin

A. Organic Resin Matrix
B. Inorganic Fillers
C. Coupling Agent

A

A

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4
Q

Low Molecular Weight Resin

A. Organic Resin Matrix
B. Inorganic Fillers
C. Coupling Agent

A

A

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5
Q

Bisphenol A=glycidyl methacrylate (Bis-GMA)

A

High Molecular Weight Resin

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6
Q

Urethane dimethacrylate (UEDMA)

A

High Molecular Weight Resin

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7
Q

Low Molecular Weight Resin

A

Triethylene Glycol dimethacrylate (TEGDMA)

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8
Q

MONOMER

A. Organic Resin Matrix
B. Inorganic Fillers
C. Coupling Agent

A

A

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9
Q

makes the initial mixture fluid and moldable for placement into a cavity preparation

A

MONOMER

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10
Q

→ quartz
→ lithium aluminum silicate
→ barium aluminum silicate
→ barium, strontium, zinc glas

A. Organic Resin Matrix
B. Inorganic Fillers
C. Coupling Agent

A

B

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11
Q

colloidal silica

A. Organic Resin Matrix
B. Inorganic Fillers
C. Coupling Agent

A

B

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12
Q

SILICATE PARTICLES (FILLER)

A. Organic Resin Matrix
B. Inorganic Fillers
C. Coupling Agent

A

B

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13
Q

→ mechanical reinforcement of the mixture

A

SILICATE PARTICLES (FILLER)

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14
Q

→ produce light transmission and light scattering that add
enamel-like translucency to the mixture

A

SILICATE PARTICLES (FILLER)

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15
Q

T or f

EFFECTS OF FILLERS:

decrease in coefficient of thermal expansion

A

T

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16
Q

T or f

EFFECTS OF FILLERS:

→ decrease in polymerization shrinkage
→ increase in compressive strength

A
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17
Q

T or f

EFFECTS OF FILLERS:

decrease in water sorption

A

T

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18
Q

T or f

EFFECTS OF FILLERS:

→ improved aesthetics
→ radiopacity

A

T

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19
Q

Gamma-methacryloxy propyltrimethoxysilane

A

ORGANOSILANES

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20
Q

provides a good bond between the inorganic fillers and resin
matrix

A

ORGANOSILANES

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21
Q

silane has groups that reacts with inorganic filler and other
groups that reacts with the organic matrix

A

ORGANOSILANES

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22
Q

hydroquinone

A

POLYMERIZATION INHIBITOR

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23
Q

butylated hydroxytoluene

A

POLYMERIZATION INHIBITOR

24
Q

INITIATOR/ACTIVATOR SYSTEM
→ self-cured/auto-cured
→ light-cured

A

POLYMERIZATION INHIBITOR

25
Q

→ filler content
o high filler levels = decrease in fluidity
→ filler particle size
→ method of filler addition
→ matrix composition
→ polymerization method

A

CLASSIFICATION

26
Q

.005 to .01 micron

A

Nanofillers

27
Q

.01 to .1 micron

A

Microfillers

28
Q

1 to 10 microns

A

Midfillers

29
Q

10 to 100 microns

A

Macrofillers

30
Q

very large particles

A

Megafillers

31
Q

→ mixed ranges of fillers
→ largest particle size defines the hybrid

A

HYBRIDS

(FILLER SIZE)

32
Q

Self-Cured

Initiator?

A

Benzoyl Peroxide

33
Q

Self-Cured

Activator?

A

Tertiary Amine

34
Q

UV Light Activated

Initiator?

A

Benzoin Methyl Ether

35
Q

Visible Light Activated

Initiator

A

Diketones and Aromatic Ketones (Camphoroquinone and Biacetyl with Tertiary Amines)

36
Q

→ color matching
→ wear
→ marginal integrity
→ post-operative sensitivity

A

CLINICAL CONSIDERATION

37
Q

smear layer

A

DENTAL ADHESIVES

38
Q

any debris, calcific in nature, produced by reduction or instrumentation of enamel, dentin, and cementum that precludes interaction with underlying tooth tissue

A

smear layer

39
Q

→ 37% phosphoric acid
→ createst micro-porosities

A

ETCHANT

40
Q

→ aids bonding to enamel by:

o removal of surface debris

o producing micro-porosities into which resin can penetrate

o causing exposure of greater surface area

→ reduces microleakage

A

EFFECTS OF ETCHING

41
Q

hydrophilic monomers dissolved in organic solvents such as ethanol and acetone

A

PRIMER

42
Q

solvents can displace H2O in the dentinal tubules and the moit collagen network

A

PRIMER

43
Q

hydrophobic properties for copolymerization with adhesive resin

A

PRIMER

44
Q

objective:

o transform the hydrophilic dentin into hydrophobic and spongy state that allows the adhesive resin to wet and penetrate the exposed collagen network

A

PRIMER

45
Q

stabilize the hybrid layer and to form resin extensions into the dentinal tubules called resin tags

A

ADHESIVE/BONDING

46
Q

zone in which the resin adhesive micromechanically interlocks with dentinal collagen

A

HYBRID LAYER

47
Q
  • rate of dimensional change of a material per unit
    change in temperature
A

Linear Coefficient of Thermal Expansion (LCTE)

48
Q
  • amount of water that the composite absorbs over a period of time per unit of surface area
  • higher filler content have lower water absorption value
A

Water Absorption

49
Q
  • shrinkage of the material while hardening
  • hybrid shrinks less than microfilled
A

Polymerization Shrinkage

50
Q
  • ability to resist surface loss as a result of rubbing
    contact with tooth structure, restorative material,
    food
  • hybrid have higher resistance to wear
A

Wear Resistance

51
Q
  • smoothness of the surface of restorative material
  • size of the filler determines the smoothness
A

Surface Texture

52
Q

PROPERTIES OF COMPOSITE

A

(1) Linear Coefficient of Thermal Expansion (LCTE)

(2) Water Absorption

(3) Polymerization Shrinkage

(4) Wear Resistance

5) Surface Texture

(6) Radiopacity
(7) High Bond Strength to Enamel and Dentin
(8) Good Color Match to Tooth Structure
(9) Ease of Manipulation
(10) Ease of Finishing and Polishing
(11) Modulus of Elasticity
(12) Solubility

53
Q

loss of weight per unit of surface area due to the disintegration in oral fluids of a material over a period of time at a given temperature

A

Solubility

54
Q

pulpal inflammatory or degenerative changes

A

PROBLEMS DUE TO MICROLEAKAGE

55
Q

detrimental effect on the property of materials

A

PROBLEMS DUE TO MICROLEAKAGE

56
Q

→ recurrent caries
→ hypersensitivity of exposed dentin
→ longevity and service-ability of restoration may be compromised

A

PROBLEMS DUE TO MICROLEAKAGE

OPEDENT (9 decks)

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