Composite Resin and GIC Flashcards
(111 cards)
1
Q
composite resins are known as
A
FILLED RESINS
2
Q
the most widely used restorative material
A
COMPOSITE RESIN
3
Q
phases of composite resin (2)
A
- Continuous Polymeric Phase
- Discontinuous Inert Phase
4
Q
the continuous polymeric phase of composite resin is due to the reaction between __________ and __________ resulting in ____________
A
glycidyl methacrylate + Bisphenol A = BisGMA
5
Q
epoxide material in the continuous polymeric phase of CR
A
glycidyl methacrylate
6
Q
organic material in the continuous polymeric phase of CR
A
Bisphenol A
7
Q
discontinuous inert phase of CR is also known as
A
DISPERSED PHASE OF INERT FILLERS
8
Q
inorganic fillers of composite resin (CR)
A
- quartz or silica
- lithium aluminum silicate
- various barium glasses
9
Q
T or F: fillers increase the strength of the resin
A
TRUE
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)
11
Q
filler surfaces are coated by
A
COUPLING AGENT
12
Q
these increases strength of composite resin by coating the fillers
A
COUPLING AGENT
13
Q
these decreases the solubility and water absorption of composite resin
A
COUPLING AGENT
14
Q
coupling agents (2)
A
- VINYL SILANE
- EPOXY SILANE
15
Q
basic types of CR
A
- CONVENTIONAL CR (MACROFILLED)
- MICROFILLED CR
- HYBRID CR or BLENDS
16
Q
other types of CR
A
- FLOWABLE
- PACKABLE
17
Q
this type of restoration provides a rough surface finish but has high compressive strength
A
CONVENTIONAL CR or MACROFILLED RESIN
18
Q
the rough surface from macrofilled resin is due to the big size of what
A
FILLERS
19
Q
filler size in macrofilled resin
A
5-25 microns (average of 8 microns)
20
Q
amount of inorganic fillers in conventional CR
A
75-80%
21
Q
amount of resin matrix in conventional CR
A
20-25%
22
Q
this was designed to replace the rough surface finish of conventional CR
A
microfilled composite resin
23
Q
amount of fillers in microfilled resin
A
inorganic: 35-50%
resin matrix: 50-65%
24
Q
filler size in microfilled resin
A
0.01-0.004 microns
25
this type of CR has smooth surface finish but low compressive strength
microfilled CR
26
this type of CR has smooth surface finish and high compressive strength
hybrid CR or blends
27
amount of fillers in blends
inorganic: 70-80%
resin matrix: 20-30%
28
filler size of this type of CR is slightly smaller than the conventional and mixed with submicron-sized fillers
blends or hybrid CR
29
T or F: flowable composites has a rough surface making it prone to wearing
TRUE. flowable composites has low wear resistance = rough surface
30
T or F: the low compressive strength of flowable composites is due to lower filler content
TRUE
31
T or F: flowable composites are indicated for extensive Class I caries
FALSE. only small Class I and as a pit and fissure sealant
32
this type of CR is used as the first increment liner under a hybrid or packable composite
flowable composite
33
properties of flowable composite (4)
1. easy to manipulate
2. low wear resistance
3. low filler content
4. low compressive strength
34
indications of flowable composite (4)
1. small Class I
2. P and F sealant
3. marginal repair material
4. liner in hybrid and packable composites
35
this was designed to be more viscous and get a “feel” upon insertion similar to amalgam
PACKABLE COMPOSITE
36
goals of developing packable composite
1. easier restoration of proximal contact
2. similarity to handling properties of amalgam
37
indications of composite resin (5)
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
38
contraindications of composite resin (2)1
1. stress-bearing posterior restorations
2. when moisture control is poor
39
T or F: moisture control is attained through the use of rubber dam
TRUE
40
T or F: CR has a high thermal conductivity
FALSE. it is not metal !!! low thermal conductivity
41
advantages of CR (7)
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
42
T or F: CR releases fluoride
FALSE. GIC releases fluoride but not CR
43
polymerization shrinkage of composite is resolved by
incremental packing
44
T or F: composite has good dentin adaptation
FALSE. that is why it needs to be etched and bonded
45
disadvantages of composite resin (7)
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
methods of polymerization
1. self cured
2. light cured
47
method where polymerization is achieved by chemical means
self cured
48
activator and initiator in self cured polymerization
activator: tertiary amine
initiator: benzoyl peroxide
49
polymerization in light cured is achieved by
photochemical reaction
50
activator and initiator in light cured
activator: visible blue light
initiator: diketone compound (benzoin methyl ether)
51
T or F: light cured polymerization provides better resistance to wear and abrasion
TRUE
52
advantages of light cured polymerizaiton
1. extended working time
2. reduced porosities
3. better resistance to wear and abrasion
53
procedures done in using composite resin
1. remove fault from the tooth
2. acid-etch
3. bond
4. add composite
54
acid etchant (37%) is usually applied for how long
15 seconds
55
appearance of cavity preparation after etching
chalky white or frosty
56
T or F: etchant should not be placed on soft tissue
TRUE. it is irritating to the pulp
57
how long is the bonding agent applied
10 seconds. then dried and cured for 10 seconds.
58
how long, usually, should composite be cured
20-30 seconds
59
this removes the surface smear layer oof dentin
acid etchant
60
what is the purpose of removing the surface smear layer of dentin
to enhance adaptation of the restorative material
61
T or F: acid etching improves wettability of polymer to enamel thus making the surface more reactive
TRUE
62
T or F: acid etching causes dissolution of exposed ends of the dentinal tubules to create surface irregularities
FALSE. enamel rods not dentinal tubules
63
surface irregularities made by acid etching increases _____ and provides ________
surface roughness; provides greater surface
64
objectives of acid etching (3)
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
usual component of acid etchant
37% phosphoric acid
66
duration of acid etchant application based on percentage of acid
10% = 30 secs
20% = 20 secs
37% = 15 secs
67
used to ensure optimum bond betweeen teeth and composite
bonding agent
68
reaction of bonding agent with enamel
mechanical and chemical
69
reaction when bonding agent locks itself into the microporosities of enamel
mechanical
70
reaciton of bonding agent with the ions of tooth surface
chemical
71
common problems of composite restoration (7)
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
T or F: a solution to isolate area in deep-seated Class V and Class IV extensive caries is to use a matrix band
FALSE. use retraction cord for caries below gingiva
73
T or F: white line around the enamel margin may be due to too much etching and bonding in the area
FALSE. due to INADEQUATE etching and bonding
74
intense pressure applied during contouring may result in
white line around enamel margin
75
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
TRUE
76
T or F: using a slow start polymerization technique will result in white line around enamel amrgin
FALSE. it will resolve the problem. white line around enamel margin is due to high intensity light curing
77
T or. F: marginal voids brought by self cure composite is repaired by preparing the area and re-restoring it
TRUE
78
T or F: shade seleciton must be done after the tooth is dried
FALSE. shade selection must be done before isolating the tooth
79
T or F: placing the shade of the selected tooth and curing it may be done to correctly choose the shade of the restoration
TRUE
80
what are some of the causes of weak and/or missing proximal contacts
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
T or F: a hand instrument mayb be used to hold the matrix band against the adjacent tooth while curing the composite
TRUE
82
T or F: bonding materials from different systems may be used
FALSE. this will cause poor retention of the material
83
these are water-based cements
GIC
84
properties of GIC (4)1
1. bonds with enamel and dentin
2. has anticariogenic propert
3, biocompatible with pulp (used as liner and base)
4. long term stability in oral environment
85
T or F: GIC is weaker than amalgam but stronger than composite
FALSE. both weaker than amalgam and composite
86
T or F: some materials of GIC has same radiographic appearance as caries
TRUE. some are radiolucent
87
advantages of GIC (5)
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
disadvantages of GIC (6)
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
T or F: due to its radiolucency, GIC is less esthetic than composite
TRUE
90
T or F: GIC may be used without bonding agent
TRUE. it has inherent adhesion to tooth strcuture
91
type of GIC used as luting cement
Type I
92
type of GIC used as liner and base
Type III
93
type of GIC used as resto material
Type II
94
classification of GIC
1. Conventional Glass Ionomer
2. Resin-Modified Glass Ionomer
3. Polyacid-Modified Composite Resins (Compomers)
95
the new transulcent dental filling material
convetional glass ionomer
96
this type of GIC was introduced in 1972 and indicated for root surface caries
convetional glass ionomer
97
T or F: conventional glass ionomer may be used for full restorations
FALSE. it has low resistance and strength and should not be used as full resto
98
this type of GIC releses fluoride
convetional glass ionomer
99
type of GIC developed in 1992
resin-modified GI
100
resin modified GI is occasionally refereed to as
DUAL-CURE
101
this has generally much lower fluoride release than conventional GI due to addition of HEMA
resin-modified GI
102
this type of GIC is easier to use and possesses better strength, wear resistance, and esthetics than conventional GI
resin-modified GI
103
indications of RMGIs
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
this type is superior to RMGIs but inferior to composite
compomers/polyacid-modified CR
105
introduced in Europe in 1993 by McLean
compomers
106
this is composite with GIC components
COMPOMERS
107
T or F: compomers are light cured making them easy to manipulate
TRUE
108
T or F: like RMGIs, compomers release less fluoride
TRUE
109
GIC comes in
powder and liquid
110
powder component of GIC
aluminosilicate
111
liquid component of GIC
polyacrylic acid
