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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
Q

What are varnishes used for

A

to seal cut dentin

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26
Q

T/F varnishes dissolve slowly in oral fluids and is not permanent

A

True

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27
Q

What is the name of an intermediary material-varnish

A

copalite/universal varnish

28
Q

What is a Liner used for*

A

to seal dentin and medicate pulp

29
Q

What does calcium hydroxide stimulate

A

secondary reparative dentin

30
Q

What 2 things seals dentinal tubules

A

varnish, glass ionomer

31
Q

What kind of pH does calcium hydroxide have

A

basic

32
Q

Calcium hydroxide dissolves in oral fluids

A

true

33
Q

what happens when calcium hydroxide dissolves

A

it raises the pH which neutralizes the pH and decreases bacterial growth

34
Q

What kind of restorations can calcium hydroxide be placed under

A

all types of direct restorations

35
Q

What is calcium hydroxide being replaced with

A

bonding material that is not soluble and doesnt weaken the tooth

36
Q

What are the 3 types of intermediary materials

A

base, varnish, liner

37
Q

what does a base do

A

absorbs biting forces and insulates pulp

38
Q

what does a liner do

A

reduces acidity, stimulates pulp and is a bonding material

39
Q

What restorative materials are tooth colored filling materials

A

esthetic direct restorative materials

40
Q

This is used for direct restorations, core buildups, veneers, sealants and cement

A

composite

41
Q

what is a BLEND direct restorative material

A

a combination of composite and glass ionomer

42
Q

WHat is compomer direct restorative material

A

hybrid of composites and glass ionomer cements

43
Q

what is a polyacid modified glass ionomer direct restorative material

A

more glass ionomer than composite

44
Q

what is a polyacid modified resin composite

A

more composite than glass ionomer

45
Q

what is important to remember about composites, glass ionomers and blends

A

they are all polymers with reinforcing particles locked in the polymer framework

46
Q

what restores form and function, bonds chemically with other polymers and effectively seals cut dentin

A

composite and glass ionomer

47
Q

what is polymethyl/methacrylate PMMA*

A

a polymer made up of multiple methacrylate monomers

48
Q

What is a Dimethacrylate resin*

A

reaction between bisphenol-A and glycidyl methacrylate= Bis-GMA**

49
Q

What kind of polymer is a dimethacrylate resin

A

a cross linked polymer

50
Q

Bis-GMA has what*

A

larger molecules therefore less polymerization shrinkage than methacrylate monomers

51
Q

Triethylenglycol Dimethacrylate (TEGDMA)*

A

dimethacrylate

reduces viscosity

52
Q

both bis-GMA and Tegdma are used in composite resins T/F

A

true

53
Q

What are the advantages and disadvantages of Urethane Dimethacrylate*

A

Advantage-low viscosity

disadvantage- more brittle, more polymerization shrinkage than bis-GMA

54
Q

What is the composition of Composites

A

monomer-dimethacrylates (Bis-GMA, TEGDMA, URethane)

55
Q

What kind of filler particles are used in composites

A

silicates (quartz), radiopaque materials (Barium, strontium, zinc) and silane (bonds matrix and fillers)

56
Q

What are the classification sizes of fillers:*

A

Macrofill 10-20 microns
Midifill .1-10microns
Microfill .01-.1 microns

57
Q

What kind of particles are in a hybrid composite*

A

combination of sizes, gives increase strength and polishability

58
Q

Why is a composite flowable*

A

less fillers more resin

59
Q

What is affects shrinkage during polymerization

A

-shape of prep and intensity of light

60
Q

what are characteristics of composite

A
  • shrinkage-polymerization
  • low thermal conductivity
  • resin absorbs water
  • thermal expansion
61
Q

What is bonding

A

formation of resin layer that connects the primed surface to the overlying restoration

62
Q

What is the smear layer

A

the compacted debris on enamel or dentin from cavity prep

63
Q

What is the composition of Glass ionomers

A

organic, ionic polymer
silicate glass
fluoride

64
Q

What is the polymerization of glass ionomers

A

chemically activated
light activated
dual cure

65
Q

what are characteristics of glass ionomer

A 
thermal expansion similar to tooth
bonds to enalel and dentin
high compressive strength
low tensile strength
slightly soluble in water
66
Q

What are glass ionomers used for

A

restoratives
cements
bases/liners

Dental Materials (6 decks)

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