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Dental Materials > Adhesives > Flashcards

Adhesives Flashcards

1
Q

What are sealants?

A

polymer coating to protect the teeth from further decay

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2
Q

What are the characteristic designs that allow for direct use?

A

light cured, flowable into pits

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3
Q

What is recommended to use before sealants to prepare the enamel?

A

etch

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4
Q

What is the major structural chemical used in sealant?

A

BidGMA-TEGDMA

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5
Q

Does sealant use fillers?

A

No

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6
Q

What type of bonding does the sealants have with the enamel?

A

mechanical

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7
Q

Are sealants meant to last a long time?

A

no but etching helps to extend longevity

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8
Q

What is macrotags?

A

larger interprism resin penetration

— looks like small notches in enamel

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9
Q

What are microtags and what is their purpose?

A

smaller penetrations into the enamel that provide the major retention of the sealant

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10
Q

How does oxygen inhibit sealants/polymerization?

A

interferes with radical polymerization via termination

thinner layer = bigger problem

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11
Q

The an adhesive layer usually hydrophobic or hydrophilic?

A

Both in order to bond with enamel and dentin

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12
Q

Do adhesive possess acid or basic groups that promote bonding

A

acidic

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13
Q

Are adhesive filled or unfilled?

A

unfilled or lightly filled

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14
Q

What two properties must flowable materials balance?

A

viscosity and mechanical properties

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15
Q

How does the resin viscosity correlate with mechanical properties?

A

increase in mechanical properties = increase in viscosity

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16
Q

How does increasing filler load affect the viscosity and mechanical properties?

A

increases viscosity and improves mechanical properties

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17
Q

Where in the tooth-adhesive-composite model does adhesive failure occur?

A

above adhesive

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18
Q

Where in the tooth-adhesive-composite model does cohesive failure occur?

A

in the middle of the adhesive layer

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19
Q

Where in the tooth-adhesive-composite model does structural failure occur?

A

in the dentin

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20
Q

What structures can interfere with adhesive bonding to tubular dentin?

A

The smear layer and plug

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21
Q

What is the smear layer and plug composed of?

A

ground collagen and hydroxy-appetite

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22
Q

How many steps are total-etch adhesives?

A

2-3

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23
Q

How many steps are self-etch adhesives?

A

1-2

24
Q

How many steps are RMGI adhesives?

A

1

25
Q

What are the 4 traditional steps for dentin bonding?

A

etch, prime, adhesive, restoration

26
Q

Is the primer hydrophobic or hydrophilic?

A

hydrophilic

27
Q

Can glass-ionomers be a cement, base, and/or liner?

A

cement and base

28
Q

Can zinc oxide eugenol be a cement, base, and/or liner?

A

all 3

29
Q

Can calcium hydroxide be a cement, base, and/or liner?

A

liner and base

30
Q

What is characteristic of cements?

A

used to bind restoration of appliances to tooth structure

31
Q

What are the three types of cements?

A

water-based
resin based
oil based

32
Q

What are the curing mechanisms?

A

light cure
cold-cure for methacrylate
water cure for cements

33
Q

What is the general scheme of chemical or cold cure?

A

mix part A and B to initiate polymerization

34
Q

How does one control the balance between mechanical properties and viscosity?

A

more filler = high viscosity & modulus

more liquid = opposite and longer working/setting time

35
Q

What is the powder to liquid ratio?

A

2.7:1

36
Q

Do resin based cements use monomers that are high or low in MW?

A

Low

37
Q

What are resin based cements used for?

A

ortho, cermanic corwns/bridges, veneers, inlays

38
Q

What is 4-META modifier?

A

an additive to promote bonding in resin adhesives

39
Q

What is zinc phosphate used for?

A

crowns

40
Q

What is a liner?

A

realtively thin material used to protect dentin from residual reactants that diffuse out of the restoration/oral fluids that may penetrate leaky restorations

41
Q

Do liners have a high or low viscosity

A

low

42
Q

What solution liners are used under amalgam?

A

copal varnish

43
Q

What solution liners are used under composite?

A

adhesives

44
Q

What are the requirements of an extensive carie?

A

close to pulp (0.5 mm) or exposed pylp

45
Q

What is used to protect the pulp in extensive caries?

A

calcium hydroxide liner

46
Q

What is characteristic of CaOH2 liners?

A 
paste reacts via acid/base
calcium ions cross link
insulator
high solubility
stimulates reparative dentin
47
Q

What cell is stimulated by CaOH2?

A

odontoblasts

48
Q

What is the brand name of CaOH2?

A

Dycal

49
Q

What are the components of zinc oxide and eugenol?

A

reinforced powder, ZnO powder, eugenol oil of clove

50
Q

What is the purpose of the oil of clove?

A

dulls pain (obtundent)

51
Q

What are the restriction of zinc oxide and eunegol?

A

cannot be sued under composite and inhibits polymerization

52
Q

What is the purpose of liners and bases?

A

protect the pulp
minimize post-op sensitivity (insulator and calm inflammation)
controls fluid movement

53
Q

Define bases

A

Provide thermal protection for the pulp and mechanical support for restorations by distributing the stress across underlying dentin

54
Q

What are the types of bases?

A

only water based

55
Q

What is the reaction utilized by bases?

A

acid-base reactions

56
Q

What are the characteristics of wax?

A 
temporary
melt at low temp
carvable
burn off
stable dimensionally
57
Q

Is the thermal expansion coefficient of wax small or large?

A

large

Dental Materials (6 decks)

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