Current Adhesives and Composite Bonding Flashcards

1
Q

attraction between similar molecules or atoms

A

Cohesion:

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2
Q

attraction between unlike molecules, attraction between two contacting surfaces

A

Adhesion:

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3
Q

: material bonded to another material by means of an adhesive

A

Adherend

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4
Q

: substance that promotes adhesion

A

Adhesive

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5
Q

: joining two materials by means of an adhesive

A

Adhesive Bonding

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6
Q

_______ adhesion classification:
◦Interlocking
◦Undercuts, surface irregularities
◦THIS IS THE DENTAL ADHESION MECHANISM

A

Mechanical Bonding

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7
Q

-the ability of a liquid to maintain intermolecular contact with a solid surface

A

Surface wetting

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8
Q

Is enamel bonding or dentin bonding more predictable?

A

Enamel

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9
Q

Chemical “drilling”
◦30-40% phosphoric acid is most effective for enamel retention
◦Removes about 10 microns
Creates porous layer 5-50 microns deep

A

Acid etching enamel

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10
Q

What type of enamel etching?

“honeycomb” from dissolution of prism CORES

A

Type 1

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11
Q

What type of enamel etching?

“cobblestone” from dissolution of prism PERIPHERIES

A

TYpe 2

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12
Q

What type of enamel etching?

combination of I and II

A

Type 3

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13
Q

What type of enamel etching?

“pitted”

A

TYpe 4

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14
Q

What type of enamel etching?

“prismless” (flat and smooth)

A

Type 5

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15
Q

RINSE with water for ___ seconds _____ etching
◦To remove acid and leave enamel surface clean for bonding
◦25mL minimum water is necessary

A

10 ; after

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16
Q

Etching _____ wettability and surface area of the enamel

A

Increases

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17
Q

Etching raises the surface free energy to EXCEED the _______ of bonding material◦= produces spaces where resin can penetrate to for resin tags

A

surface tension

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18
Q

In what portion of the tooth is there less adhesion due to shorter and fewer enamel tags?

A

Cervical 1/3

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19
Q

Reduce microleakage at cervical and ascending walls in Class II preparations
NECESSARY!
Increases surface energy

A

Bevels

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20
Q

The micromechanical bond that is formed in enamel interlocks with etched ______

A

Enamel rods

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21
Q

The micromechanical bond that is formed in dentin interlocks with etched ______

A

Dentin collagen

22
Q

What is the bond strength in MPa of enamel-adhesive-composite bond?

23
Q

Is enamel mostly inorganic or organic material?

A

Inorganic material

24
Q

Which is better for adhesion and bonding enamel or dentin?

25
What portion of dentin do you want to bond to?
INtertubular dentin
26
_____ dentin: more fluid,more & wider tubules,& less intertubulardentinthan superficial dentin.
Deeper dentin
27
mixture of tooth debris, often contaminated with saliva, blood cells, and bacteria DO NOT BOND to this Remove with acid etch
Smear Layer
28
______ is the intermingled layer of collagen and resin
Hybrid layer
29
HOw long do you etch dentin?
15 secs
30
``` _____results in underfilledrestorations Steps: ◦Acid Etch TOO LONG ◦Wash and lightly dry =Demineralized zone is too thick =Primer can not infiltrate far enough =Leaves unprotected layer subject to degradation leads to premature bond failure leads to failure over time due to hydrolysis of uninfilitrated collagen ```
OVERETCHING
31
_______ results in lower bond strengths =Collagen collapses = lower bond strength
OVERDRYING
32
results in collagen that is too wet ◦Excess water ◦Poor hybrid layer formation ◦Resin unable to infiltrate intertubular dentin ◦“blister spaces” where primer and adhesive separate
UNDERDRYING
33
What is the etchant composed of?
Phosphoric acid
34
Is the primer hydrophilic or hydrophobic?
Hydrophilic
35
Is the adhesive bonding resin hydrophilic or hydrophobic?
Hydrophobic
36
Is there a lot or a little filler in bonding systems?
Little filler
37
How long do you etch enamel?
15-30 secs
38
Do you want enamel dry or slightly moist?
Dry
39
Do you want dentin dry or slightly moist?
Slightly moist
40
The primary dentin bond mechanism is from ________
Hybrid layer
41
Is there a better bond in superficial or deep dentin?
Superficial dentin
42
Do you rinse in total etch or self-etch?
Total etch
43
Total etch systems are ____ predictable and create a ____ bond
More; stronger
44
``` Disadvantages of _____ systems: ◦Collagen collapse is possible* ◦Etched zone is often deeper than hybrid layer ◦Exposed demineralized, collagen fibrils ◦Post-operative sensitivity ```
Total etch systems
45
Advantages of _____ systems: ◦No separate etch: overdried, collapsed demineralized collagen not a problem ◦Etched zone and hybrid layer comparable width; however, some exposed collagen ◦Low post-operative sensitivity ◦Time efficiency -decreased operator error
Self-etch systems
46
DisAdvantages of _____ systems: ◦Not compatible with self-cure, dual-cure composite ◦Acidic monomers, low pH, “kills” the basic amine activator ◦Will not etch unprepared enamel -Lower bond strength
Self etch systems
47
Can be used in total etch, self-etch or selective-etch mode (etch enamel only with phosphoric acid)
Universal adhesives
48
T/F: You Don't want to directly etch pulp
True
49
Which etch system has increased bond but increased possibility for error?
Total etch
50
Which etch system has no etching, decreased bond strength, and increased sensitivity? Less operator error too
Self etch
51
______ is used on ACC crown preps ◦2% Chlorhexidine Antibacterial Solution ◦Applied after acid etching -increases bond strength
Consepsis