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SU14; Operative II > Adhesives and Bonding > Flashcards

Adhesives and Bonding Flashcards

1
Q

What is the procedure of bonding to enamel

A

etch enamel
rinse and dry
place enamel bonding resin
place restorative composite

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2
Q

The path of etch is similar to what

A

caries-cores of rods etch more and lateral sides near sheath

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3
Q

How much of the surface is etched

A

10µm of surface and penetrates 25-75µm

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4
Q

What is the strength of the acid used to etching

A

37% phosphoric acid

some 10% solutions being advocated total etch technique

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5
Q

What is the length of time for etching

A

15-20 sec

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6
Q

Why do primary teeth require a longer etching time

A

hyperfluornated

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7
Q

What is the proper timing for rinsing etch

A

10-20 sec
short rinse may leave debris
long rinse may weaken bond

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8
Q

What is the result upend contamination of etched enamel by saliva or secular fluid

A

it decreases the bond strength

must re-etch

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9
Q

What is the visual clue to determine successful etching

A

frosty white coloring

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10
Q

What are some drying techniques used to dry the etch

A

electric hot air dryers
HVE
three way syringe
liquid drying agents do not seem to do anything

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11
Q

What is the difference of etch pattern from gel to liquid

A

they are the same pattern!
can control gel pattern more
liquid etch is good for grooves and fissures

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12
Q

Bonding resin is made up of what

A

low viscosity resins (monomers)

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13
Q

After the bonding resin is places with a 10 sec cure, the composite is applied how

A

2mm increments

40 sec light cure

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14
Q

The remineralization of etched enamel can take up to how many months

A

2-3; fluoride can induce remineralization

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15
Q

Why is remineralization practical or not

A

etched enamel is probably polished off during finishing

protein matrix destroyed during finishing

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16
Q

Freshly cut etched enamel produces 25-50% greater bond strengths than uncut, why?

A

to get through the first amorphous enamel to get to the rods

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17
Q

This gives a good esthetic transition from tooth to material, the best marginal seal and minimum micro leakage, but a less durable restorative material margin configuration

A

a 45° exit

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18
Q

This conserves maximum tooth structure, produces weaker enamel bonds, can be optically more difficult to hide transition from tooth to material, most durable material margin configuration

A

90° exit

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19
Q

What is the procedure of bonding to dentin

A

etch dentin
rinse and dry
place dentin/enamel bonding resin
place restorative composite

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20
Q

This is an adherent layer of tooth debris, saliva, and bacteria which covers surface and plugs tubules to reduce dentin permeability, it offers weak cohesion and adhesion and must be addressed

A

smear layer

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21
Q

Newer dentin bonding systems remove this, which interferes with the resin bonding

A

smear layer

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22
Q

You must be aware of these changes in dentin

A

aging;
primary and secondary are organized
tertiary or repetitive is irregular
sclerotic dentin is high mineralized and response to mild stimulus

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23
Q

Cervical lesions can have either of these two things

A

sensitivity; open tubules

insensitive; transparant, discolored, occluded tubules

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24
Q

This relies on demineralization and is micromechanical

A

resin based dentin adhesion

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25
Q

This is difficult to etch, less collagen; use materials that rely on mineral RMGI or GI

A

sclerosed dentin highly mineralized

26
Q

Must address the smear layer, how?

A

ionic and hydrophilic resins

establish micro-mechanical attachment to dentin surface

27
Q

What are the three methods of attachment involving dentin

A

smear layer saturation
tubular penetration
resin impregnation

28
Q

This is a self-etch system involving acidic monomers (phosphate esters/carboxylic acids); minor retentive feature

A

smear layer penetration

29
Q

This is the penetration of resin down tubules; moderate retentive feature

A

tubular penetration

30
Q

This is dentin demineralization, resin penetrating and wetting remaining collagen; major retentive feature

A

resin impregnation

31
Q

What are three components of a dentin bonding system

A

conditioner or etchant
dentin primer
adhesive resin

32
Q

This is used to remove the smear layer and cleans surface but does not demineralize dentin; mild acids

A

conditioner (RMGI)

33
Q

This removes the smear layer, demineralizes dentin and leaves a pours surface

A

etchant (adhesive)

34
Q

What is the total etch system

A

3 step system or 2 step

etch and rinse then either primer then adhesive or primer/adhesive at once

35
Q

What is the self etch system

A

2 step or 1 step
etch/primer then adhesive
or all at once

36
Q

This is a hydrophilic monomer mixed with solvent; increases smear layer permeability, penetrate wet collagen and provides micro mechanical retention

A

primer

37
Q

This is light or unfilled resin; intermediate between primer and composite
copolymerize with primer and composite
usually both hydrophobic and hydrophilic

A

adhesive resin

38
Q

Is this enamel or dentin bonding; provides long term durable bond

A

enamel

39
Q

Is this enamel or dentin bonding; is not as predictable

A

dentin

40
Q

Is this enamel or dentin bonding; this interface may exhibit microleakage

A

dentin

41
Q

What is the first step in dentin bonding

A

acid etch the dentin surface to remove smear layer and create spaces between collagen network

42
Q

After etching the dentin, what is the next step

A

apply dentin primer; hydrophilic solutions; penetrate and impregnate collagen

43
Q

After applying the primer, what is the next step

A

apply adhesive; penetrates remaining porosities and provides a seal and hydrophobic surface

44
Q

How would you apply composites in dentin bonding

A

in 2mm increments

45
Q

What is dry bonding

A

all moisture is removed and the dentin is dehydrated

there is potential for collagen to collapse and it decreases permeability

46
Q

What is wet bonding

A

all excess moisture removed
dentin surface is fully hydrated
collagen network is exposed
there is a thin layer of water but is removed by acetone based primers and resin replaces water without collapsing collagen network

47
Q

What is the clinical significance of wet/dry bonding

A

bond quality

posterior sensitivity

48
Q

What four things can contaminate dentin bonding

A

hand piece oil
intersulcular fluid
hemorrhage
air/water syringe

49
Q

What four things play into the storage of bonding materials

A

evaporation
cross contamination
temperature
shelf life

50
Q

When sealing dentin with resin, what is important to keep in mind

A

resin can penetrate the tubules toward the pulp
they are difficult to cure when mixed with fluid
unpolymerized monomer can leach into pulp; long term effects are unknown

51
Q

What three things are associated with resin-resin bonding

A

applications
techniques
mechanisms

52
Q

What are three resin-resin bonding applications

A

layering restorations; control color and shrinkage
resurfacing or repairing
cementation of indirect processed composite restorations (inlays, crowds, bridges)

53
Q

What are the two types of resin-resin bonding

A 
immediate
delayed (>24hrs)
54
Q

In immediate resin-resin bonding this unreacted bonding is left

A

air inhibited layer

55
Q

This occurs after the light is removed regarding immediate resin-resin bonding

A

dark-cure polymerization

56
Q

This under 10 minutes, new composite can be added directly to the surface, why

A

composite bonds chemically to air inhibited layer

57
Q

If greater than 10 minutes or contamination, how can you add composite

A

clean with etchant and add layers of resin

58
Q

In delayed resin-resin bonding, there is no what left

A

no unreacted bonds; no air inhibited layer

these are mechanical bonds

59
Q

What do the mechanical bonds of delayed resin-resin bonding rely on

A

roughened surface

good wetting of material

60
Q

When using a hybrid delayed resin-resin bonding what steps should you yake

A

roughen (diamond or microabrator)
acid etch
rinse and dry
place infilled resin - wets surface

SU14; Operative II (5 decks)

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