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Dental Materials > Test #1-2 > Flashcards

Test #1-2 Flashcards

1
Q

What are the qualities that are needed for a base

A
  • thick
  • absorbs biting forces
  • thermal insulation
  • irritation to stimulate secondary dentin
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2
Q

what is the current belief that pulplal sensitivity is caused by

A

micro leakage not temp change

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3
Q

what is not preferred over a base material

A

bond, eliminates microleakage

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4
Q

what can be used as a base

A

any dental cement

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5
Q

what base cant be used under composite materials

A

ZOE

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6
Q

What base has a stronger matrix, has less effect on pulp due to neutral ZOE

A

EBA (ethoybenzoic)

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7
Q

why must zinc phosphate be mixed on a cool glass slab

A

exothermic*

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8
Q

Zinc oxide powder is mixed with __________ initial set is very_________

A

phosphoric acid, acidic

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9
Q

what is zinc phosphate not recommended for

A

deep cavit prep unless a layer of calcium hydroxide is first placed

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10
Q

what is the acidity like of polycarboxylate

A

acidic- but ph rises with time there fore its kinder to pulp

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11
Q

what restorations can polycarboxylate be placed under

A

all restorations, usually amalgam

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12
Q

what is the primary use of polycarboxylate

A

cement

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13
Q

what is the most popular base

A

glass ionomer

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14
Q

what are qualities of glass ionomer

A

strength, bonding, fl2, non irritating, anticariogenic

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15
Q

what are qualities of glass reinforced polymer

A

bonds to dentin, releases fl2

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16
Q

because glass ionomer is a polymer what else can it bond to

A

other polymer materials used in restorations

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17
Q

b/c glass ionomer bonds what does it reduce

A

microleakage at the interface

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18
Q

glass ionomer can be used under

A

all restorations

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19
Q

what are resin cements

A

fluid composites, less fillers

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20
Q

what are some examples of resins

A

mouthguards, bleach trays dentures, partials

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21
Q

what material will be used when the restoration is temporary

A

ZOE

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22
Q

what material will be used in a deep cavity prep

A

calcium hydroxide

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23
Q

what is used as a bonding agent under esthetic polymers, glass ionomers, composite and hybrids

A

acrylic resin/glass ionomer

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24
Q

What are varnishes being replaced by

A

bonding agents

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25
What are varnishes used for
to seal cut dentin
26
T/F varnishes dissolve slowly in oral fluids and is not permanent
True
27
What is the name of an intermediary material-varnish
copalite/universal varnish
28
What is a Liner used for*
to seal dentin and medicate pulp
29
What does calcium hydroxide stimulate
secondary reparative dentin
30
What 2 things seals dentinal tubules
varnish, glass ionomer
31
What kind of pH does calcium hydroxide have
basic
32
Calcium hydroxide dissolves in oral fluids
true
33
what happens when calcium hydroxide dissolves
it raises the pH which neutralizes the pH and decreases bacterial growth
34
What kind of restorations can calcium hydroxide be placed under
all types of direct restorations
35
What is calcium hydroxide being replaced with
bonding material that is not soluble and doesnt weaken the tooth
36
What are the 3 types of intermediary materials
base, varnish, liner
37
what does a base do
absorbs biting forces and insulates pulp
38
what does a liner do
reduces acidity, stimulates pulp and is a bonding material
39
What restorative materials are tooth colored filling materials
esthetic direct restorative materials
40
This is used for direct restorations, core buildups, veneers, sealants and cement
composite
41
what is a BLEND direct restorative material
a combination of composite and glass ionomer
42
WHat is compomer direct restorative material
hybrid of composites and glass ionomer cements
43
what is a polyacid modified glass ionomer direct restorative material
more glass ionomer than composite
44
what is a polyacid modified resin composite
more composite than glass ionomer
45
what is important to remember about composites, glass ionomers and blends
they are all polymers with reinforcing particles locked in the polymer framework
46
what restores form and function, bonds chemically with other polymers and effectively seals cut dentin
composite and glass ionomer
47
what is polymethyl/methacrylate PMMA*
a polymer made up of multiple methacrylate monomers
48
What is a Dimethacrylate resin*
reaction between bisphenol-A and glycidyl methacrylate= Bis-GMA**
49
What kind of polymer is a dimethacrylate resin
a cross linked polymer
50
Bis-GMA has what*
larger molecules therefore less polymerization shrinkage than methacrylate monomers
51
Triethylenglycol Dimethacrylate (TEGDMA)*
dimethacrylate | reduces viscosity
52
both bis-GMA and Tegdma are used in composite resins T/F
true
53
What are the advantages and disadvantages of Urethane Dimethacrylate*
Advantage-low viscosity | disadvantage- more brittle, more polymerization shrinkage than bis-GMA
54
What is the composition of Composites
monomer-dimethacrylates (Bis-GMA, TEGDMA, URethane)
55
What kind of filler particles are used in composites
silicates (quartz), radiopaque materials (Barium, strontium, zinc) and silane (bonds matrix and fillers)
56
What are the classification sizes of fillers:*
Macrofill 10-20 microns Midifill .1-10microns Microfill .01-.1 microns
57
What kind of particles are in a hybrid composite*
combination of sizes, gives increase strength and polishability
58
Why is a composite flowable*
less fillers more resin
59
What is affects shrinkage during polymerization
-shape of prep and intensity of light
60
what are characteristics of composite
- shrinkage-polymerization - low thermal conductivity - resin absorbs water - thermal expansion
61
What is bonding
formation of resin layer that connects the primed surface to the overlying restoration
62
What is the smear layer
the compacted debris on enamel or dentin from cavity prep
63
What is the composition of Glass ionomers
organic, ionic polymer silicate glass fluoride
64
What is the polymerization of glass ionomers
chemically activated light activated dual cure
65
what are characteristics of glass ionomer
``` thermal expansion similar to tooth bonds to enalel and dentin high compressive strength low tensile strength slightly soluble in water ```
66
What are glass ionomers used for
restoratives cements bases/liners

Dental Materials (6 decks)

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