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Direct Esthetic Restoration > Composite Resin and GIC > Flashcards

Composite Resin and GIC Flashcards

1
Q

composite resins are known as

A

FILLED RESINS

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2
Q

the most widely used restorative material

A

COMPOSITE RESIN

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3
Q

phases of composite resin (2)

A
  1. Continuous Polymeric Phase
  2. Discontinuous Inert Phase
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4
Q

the continuous polymeric phase of composite resin is due to the reaction between __________ and __________ resulting in ____________

A

glycidyl methacrylate + Bisphenol A = BisGMA

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5
Q

epoxide material in the continuous polymeric phase of CR

A

glycidyl methacrylate

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6
Q

organic material in the continuous polymeric phase of CR

A

Bisphenol A

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7
Q

discontinuous inert phase of CR is also known as

A

DISPERSED PHASE OF INERT FILLERS

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8
Q

inorganic fillers of composite resin (CR)

A
  1. quartz or silica
  2. lithium aluminum silicate
  3. various barium glasses
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9
Q

T or F: fillers increase the strength of the resin

A

TRUE

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10
Q

T or F: the coefficient of thermal expansion is increased due to inert fillers

A

FALSE. decreased (which is good = enhances use of resin)

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11
Q

filler surfaces are coated by

A

COUPLING AGENT

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12
Q

these increases strength of composite resin by coating the fillers

A

COUPLING AGENT

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13
Q

these decreases the solubility and water absorption of composite resin

A

COUPLING AGENT

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14
Q

coupling agents (2)

A
  1. VINYL SILANE
  2. EPOXY SILANE
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15
Q

basic types of CR

A
  1. CONVENTIONAL CR (MACROFILLED)
  2. MICROFILLED CR
  3. HYBRID CR or BLENDS
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16
Q

other types of CR

A
  1. FLOWABLE
  2. PACKABLE
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17
Q

this type of restoration provides a rough surface finish but has high compressive strength

A

CONVENTIONAL CR or MACROFILLED RESIN

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18
Q

the rough surface from macrofilled resin is due to the big size of what

A

FILLERS

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19
Q

filler size in macrofilled resin

A

5-25 microns (average of 8 microns)

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20
Q

amount of inorganic fillers in conventional CR

A

75-80%

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21
Q

amount of resin matrix in conventional CR

A

20-25%

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22
Q

this was designed to replace the rough surface finish of conventional CR

A

microfilled composite resin

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23
Q

amount of fillers in microfilled resin

A

inorganic: 35-50%
resin matrix: 50-65%

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24
Q

filler size in microfilled resin

A

0.01-0.004 microns

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25
Q

this type of CR has smooth surface finish but low compressive strength

A

microfilled CR

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26
Q

this type of CR has smooth surface finish and high compressive strength

A

hybrid CR or blends

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27
Q

amount of fillers in blends

A

inorganic: 70-80%
resin matrix: 20-30%

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28
Q

filler size of this type of CR is slightly smaller than the conventional and mixed with submicron-sized fillers

A

blends or hybrid CR

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29
Q

T or F: flowable composites has a rough surface making it prone to wearing

A

TRUE. flowable composites has low wear resistance = rough surface

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30
Q

T or F: the low compressive strength of flowable composites is due to lower filler content

A

TRUE

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31
Q

T or F: flowable composites are indicated for extensive Class I caries

A

FALSE. only small Class I and as a pit and fissure sealant

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32
Q

this type of CR is used as the first increment liner under a hybrid or packable composite

A

flowable composite

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33
Q

properties of flowable composite (4)

A
  1. easy to manipulate
  2. low wear resistance
  3. low filler content
  4. low compressive strength
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34
Q

indications of flowable composite (4)

A
  1. small Class I
  2. P and F sealant
  3. marginal repair material
  4. liner in hybrid and packable composites
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35
Q

this was designed to be more viscous and get a “feel” upon insertion similar to amalgam

A

PACKABLE COMPOSITE

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36
Q

goals of developing packable composite

A
  1. easier restoration of proximal contact
  2. similarity to handling properties of amalgam
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37
Q

indications of composite resin (5)

A
  1. Class I-VI restorations
  2. As foundation for core buildups
  3. Sealants and conservative restoration for preventive restorations
  4. Esthetic enhancement procedures
  5. Periodontal splinting
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38
Q

contraindications of composite resin (2)1

A
  1. stress-bearing posterior restorations
  2. when moisture control is poor
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39
Q

T or F: moisture control is attained through the use of rubber dam

A

TRUE

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40
Q

T or F: CR has a high thermal conductivity

A

FALSE. it is not metal !!! low thermal conductivity

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41
Q

advantages of CR (7)

A
  1. esthetic
  2. low thermal conductivity
  3. no galvanic reactions
  4. direct material (1 appointment only)
  5. easily repaired
  6. bonded resin may enhance tooth strength
  7. conservative preparation technique that minimizes removal of sound tooth structure
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42
Q

T or F: CR releases fluoride

A

FALSE. GIC releases fluoride but not CR

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43
Q

polymerization shrinkage of composite is resolved by

A

incremental packing

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44
Q

T or F: composite has good dentin adaptation

A

FALSE. that is why it needs to be etched and bonded

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45
Q

disadvantages of composite resin (7)

A
  1. no self-sealing quality like amalgam
  2. poor dentin marginal adaptation
  3. low wear resistance
  4. low fracture strength
  5. excessive wear under stress
  6. no fluoride release
  7. polymerization shrinkage may cause bacterial leakage and high stress to develop
46
Q

methods of polymerization

A
  1. self cured
  2. light cured
47
Q

method where polymerization is achieved by chemical means

A

self cured

48
Q

activator and initiator in self cured polymerization

A

activator: tertiary amine
initiator: benzoyl peroxide

49
Q

polymerization in light cured is achieved by

A

photochemical reaction

50
Q

activator and initiator in light cured

A

activator: visible blue light
initiator: diketone compound (benzoin methyl ether)

51
Q

T or F: light cured polymerization provides better resistance to wear and abrasion

A

TRUE

52
Q

advantages of light cured polymerizaiton

A
  1. extended working time
  2. reduced porosities
  3. better resistance to wear and abrasion
53
Q

procedures done in using composite resin

A
  1. remove fault from the tooth
  2. acid-etch
  3. bond
  4. add composite
54
Q

acid etchant (37%) is usually applied for how long

A

15 seconds

55
Q

appearance of cavity preparation after etching

A

chalky white or frosty

56
Q

T or F: etchant should not be placed on soft tissue

A

TRUE. it is irritating to the pulp

57
Q

how long is the bonding agent applied

A

10 seconds. then dried and cured for 10 seconds.

58
Q

how long, usually, should composite be cured

A

20-30 seconds

59
Q

this removes the surface smear layer oof dentin

A

acid etchant

60
Q

what is the purpose of removing the surface smear layer of dentin

A

to enhance adaptation of the restorative material

61
Q

T or F: acid etching improves wettability of polymer to enamel thus making the surface more reactive

A

TRUE

62
Q

T or F: acid etching causes dissolution of exposed ends of the dentinal tubules to create surface irregularities

A

FALSE. enamel rods not dentinal tubules

63
Q

surface irregularities made by acid etching increases _____ and provides ________

A

surface roughness; provides greater surface

64
Q

objectives of acid etching (3)

A
  1. to remove surface smear layer of dentin
  2. to alter surface energy of freshly etched enamel to make surface more reactive
  3. to cause dissolution of exposed ends of enamel rods to crease surface irregularities
65
Q

usual component of acid etchant

A

37% phosphoric acid

66
Q

duration of acid etchant application based on percentage of acid

A

10% = 30 secs
20% = 20 secs
37% = 15 secs

67
Q

used to ensure optimum bond betweeen teeth and composite

A

bonding agent

68
Q

reaction of bonding agent with enamel

A

mechanical and chemical

69
Q

reaction when bonding agent locks itself into the microporosities of enamel

A

mechanical

70
Q

reaciton of bonding agent with the ions of tooth surface

A

chemical

71
Q

common problems of composite restoration (7)

A
  1. poor isolation of operating area
  2. white line around enamel margin
  3. voids
  4. weak or missing proximal contacts
  5. incorrect shade
  6. poor retention
  7. contouring and finisihing problems
72
Q

T or F: a solution to isolate area in deep-seated Class V and Class IV extensive caries is to use a matrix band

A

FALSE. use retraction cord for caries below gingiva

73
Q

T or F: white line around the enamel margin may be due to too much etching and bonding in the area

A

FALSE. due to INADEQUATE etching and bonding

74
Q

intense pressure applied during contouring may result in

A

white line around enamel margin

75
Q

T or F: since the white line around enamel margin in seen only on the surface, removing and re-restoring the fault may solve the problem

A

TRUE

76
Q

T or F: using a slow start polymerization technique will result in white line around enamel amrgin

A

FALSE. it will resolve the problem. white line around enamel margin is due to high intensity light curing

77
Q

T or. F: marginal voids brought by self cure composite is repaired by preparing the area and re-restoring it

A

TRUE

78
Q

T or F: shade seleciton must be done after the tooth is dried

A

FALSE. shade selection must be done before isolating the tooth

79
Q

T or F: placing the shade of the selected tooth and curing it may be done to correctly choose the shade of the restoration

A

TRUE

80
Q

what are some of the causes of weak and/or missing proximal contacts

A
  1. inadequately contoured matrix band
  2. inadequate weding
  3. movement of matrxi band during inseriton of composite
  4. matrix band too thick
  5. tacky composite pulling away from the matrix contact during insertion
81
Q

T or F: a hand instrument mayb be used to hold the matrix band against the adjacent tooth while curing the composite

A

TRUE

82
Q

T or F: bonding materials from different systems may be used

A

FALSE. this will cause poor retention of the material

83
Q

these are water-based cements

A

GIC

84
Q

properties of GIC (4)1

A
  1. bonds with enamel and dentin
  2. has anticariogenic propert
    3, biocompatible with pulp (used as liner and base)
  3. long term stability in oral environment
85
Q

T or F: GIC is weaker than amalgam but stronger than composite

A

FALSE. both weaker than amalgam and composite

86
Q

T or F: some materials of GIC has same radiographic appearance as caries

A

TRUE. some are radiolucent

87
Q

advantages of GIC (5)

A
  1. inherent adhesion to tooth structure
  2. high retention rate
  3. little shrinkage and good marginal seal
  4. biocompatible
  5. minimal cavity prep required
88
Q

disadvantages of GIC (6)

A
  1. brittle
  2. may crack
  3. radiolucent
  4. some release less fluoride than convetional GIC
  5. non-inherently radiopaque
  6. less esthetic than composite
89
Q

T or F: due to its radiolucency, GIC is less esthetic than composite

A

TRUE

90
Q

T or F: GIC may be used without bonding agent

A

TRUE. it has inherent adhesion to tooth strcuture

91
Q

type of GIC used as luting cement

A

Type I

92
Q

type of GIC used as liner and base

A

Type III

93
Q

type of GIC used as resto material

A

Type II

94
Q

classification of GIC

A
  1. Conventional Glass Ionomer
  2. Resin-Modified Glass Ionomer
  3. Polyacid-Modified Composite Resins (Compomers)
95
Q

the new transulcent dental filling material

A

convetional glass ionomer

96
Q

this type of GIC was introduced in 1972 and indicated for root surface caries

A

convetional glass ionomer

97
Q

T or F: conventional glass ionomer may be used for full restorations

A

FALSE. it has low resistance and strength and should not be used as full resto

98
Q

this type of GIC releses fluoride

A

convetional glass ionomer

99
Q

type of GIC developed in 1992

A

resin-modified GI

100
Q

resin modified GI is occasionally refereed to as

A

DUAL-CURE

101
Q

this has generally much lower fluoride release than conventional GI due to addition of HEMA

A

resin-modified GI

102
Q

this type of GIC is easier to use and possesses better strength, wear resistance, and esthetics than conventional GI

A

resin-modified GI

103
Q

indications of RMGIs

A
  1. class V resto in adults who are high risk for caries
  2. Class I and II in primary teeth that won’t require long term service
104
Q

this type is superior to RMGIs but inferior to composite

A

compomers/polyacid-modified CR

105
Q

introduced in Europe in 1993 by McLean

A

compomers

106
Q

this is composite with GIC components

A

COMPOMERS

107
Q

T or F: compomers are light cured making them easy to manipulate

A

TRUE

108
Q

T or F: like RMGIs, compomers release less fluoride

A

TRUE

109
Q

GIC comes in

A

powder and liquid

110
Q

powder component of GIC

A

aluminosilicate

111
Q

liquid component of GIC

A

polyacrylic acid

Direct Esthetic Restoration (5 decks)

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