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Operative II > Current Adhesives and Composite Bonding > Flashcards

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?

A

20-25 MPa

23
Q

Is enamel mostly inorganic or organic material?

A

Inorganic material

24
Q

Which is better for adhesion and bonding enamel or dentin?

A

Enamel

25
Q

What portion of dentin do you want to bond to?

A

INtertubular dentin

26
Q

_____ dentin: more fluid,more & wider tubules,& less intertubulardentinthan superficial dentin.

A

Deeper dentin

27
Q

mixture of tooth debris, often contaminated with saliva, blood cells, and bacteria
DO NOT BOND to this
Remove with acid etch

A

Smear Layer

28
Q

______ is the intermingled layer of collagen and resin

A

Hybrid layer

29
Q

HOw long do you etch dentin?

A

15 secs

30
Q 
\_\_\_\_\_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
A

OVERETCHING

31
Q

_______ results in lower bond strengths
=Collagen collapses
= lower bond strength

A

OVERDRYING

32
Q

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

A

UNDERDRYING

33
Q

What is the etchant composed of?

A

Phosphoric acid

34
Q

Is the primer hydrophilic or hydrophobic?

A

Hydrophilic

35
Q

Is the adhesive bonding resin hydrophilic or hydrophobic?

A

Hydrophobic

36
Q

Is there a lot or a little filler in bonding systems?

A

Little filler

37
Q

How long do you etch enamel?

A

15-30 secs

38
Q

Do you want enamel dry or slightly moist?

A

Dry

39
Q

Do you want dentin dry or slightly moist?

A

Slightly moist

40
Q

The primary dentin bond mechanism is from ________

A

Hybrid layer

41
Q

Is there a better bond in superficial or deep dentin?

A

Superficial dentin

42
Q

Do you rinse in total etch or self-etch?

A

Total etch

43
Q

Total etch systems are ____ predictable and create a ____ bond

A

More; stronger

44
Q 
Disadvantages of \_\_\_\_\_ systems:
◦Collagen collapse is possible*
◦Etched zone is often deeper than hybrid layer
◦Exposed demineralized, collagen fibrils
◦Post-operative sensitivity
A

Total etch systems

45
Q

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

A

Self-etch systems

46
Q

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

A

Self etch systems

47
Q

Can be used in total etch, self-etch or selective-etch mode (etch enamel only with phosphoric acid)

A

Universal adhesives

48
Q

T/F: You Don’t want to directly etch pulp

A

True

49
Q

Which etch system has increased bond but increased possibility for error?

A

Total etch

50
Q

Which etch system has no etching, decreased bond strength, and increased sensitivity? Less operator error too

A

Self etch

51
Q

______ is used on ACC crown preps
◦2% Chlorhexidine Antibacterial Solution
◦Applied after acid etching
-increases bond strength

A

Consepsis

Operative II (11 decks)

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