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SU14; Operative II > Adhesives and Bonding > Flashcards

Adhesives and Bonding Flashcards

(60 cards)

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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
This is difficult to etch, less collagen; use materials that rely on mineral RMGI or GI
sclerosed dentin highly mineralized
26
Must address the smear layer, how?
ionic and hydrophilic resins | establish micro-mechanical attachment to dentin surface
27
What are the three methods of attachment involving dentin
smear layer saturation tubular penetration resin impregnation
28
This is a self-etch system involving acidic monomers (phosphate esters/carboxylic acids); minor retentive feature
smear layer penetration
29
This is the penetration of resin down tubules; moderate retentive feature
tubular penetration
30
This is dentin demineralization, resin penetrating and wetting remaining collagen; major retentive feature
resin impregnation
31
What are three components of a dentin bonding system
conditioner or etchant dentin primer adhesive resin
32
This is used to remove the smear layer and cleans surface but does not demineralize dentin; mild acids
conditioner (RMGI)
33
This removes the smear layer, demineralizes dentin and leaves a pours surface
etchant (adhesive)
34
What is the total etch system
3 step system or 2 step | etch and rinse then either primer then adhesive or primer/adhesive at once
35
What is the self etch system
2 step or 1 step etch/primer then adhesive or all at once
36
This is a hydrophilic monomer mixed with solvent; increases smear layer permeability, penetrate wet collagen and provides micro mechanical retention
primer
37
This is light or unfilled resin; intermediate between primer and composite copolymerize with primer and composite usually both hydrophobic and hydrophilic
adhesive resin
38
Is this enamel or dentin bonding; provides long term durable bond
enamel
39
Is this enamel or dentin bonding; is not as predictable
dentin
40
Is this enamel or dentin bonding; this interface may exhibit microleakage
dentin
41
What is the first step in dentin bonding
acid etch the dentin surface to remove smear layer and create spaces between collagen network
42
After etching the dentin, what is the next step
apply dentin primer; hydrophilic solutions; penetrate and impregnate collagen
43
After applying the primer, what is the next step
apply adhesive; penetrates remaining porosities and provides a seal and hydrophobic surface
44
How would you apply composites in dentin bonding
in 2mm increments
45
What is dry bonding
all moisture is removed and the dentin is dehydrated | there is potential for collagen to collapse and it decreases permeability
46
What is wet bonding
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
What is the clinical significance of wet/dry bonding
bond quality | posterior sensitivity
48
What four things can contaminate dentin bonding
hand piece oil intersulcular fluid hemorrhage air/water syringe
49
What four things play into the storage of bonding materials
evaporation cross contamination temperature shelf life
50
When sealing dentin with resin, what is important to keep in mind
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
What three things are associated with resin-resin bonding
applications techniques mechanisms
52
What are three resin-resin bonding applications
layering restorations; control color and shrinkage resurfacing or repairing cementation of indirect processed composite restorations (inlays, crowds, bridges)
53
What are the two types of resin-resin bonding
``` immediate delayed (>24hrs) ```
54
In immediate resin-resin bonding this unreacted bonding is left
air inhibited layer
55
This occurs after the light is removed regarding immediate resin-resin bonding
dark-cure polymerization
56
This under 10 minutes, new composite can be added directly to the surface, why
composite bonds chemically to air inhibited layer
57
If greater than 10 minutes or contamination, how can you add composite
clean with etchant and add layers of resin
58
In delayed resin-resin bonding, there is no what left
no unreacted bonds; no air inhibited layer | these are mechanical bonds
59
What do the mechanical bonds of delayed resin-resin bonding rely on
roughened surface | good wetting of material
60
When using a hybrid delayed resin-resin bonding what steps should you yake
roughen (diamond or microabrator) acid etch rinse and dry place infilled resin - wets surface

SU14; Operative II (5 decks)

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