Bonding Agents Flashcards

(31 cards)

1
Q

What is the mechanism of Adhesion (resin-based)?

A

Replacement of minerals from hard tissue by resin monomers micromechanically interolocked

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2
Q

Why is enamel more predictable to bond to?

A
  • More homogenous structure
  • High inorganic content
  • Higher surface energy
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3
Q

Why is dentin less predictable to bond to?

A
  • high variability

- higher organic content

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4
Q

What is the composition of enamel?

A
  • 86% Inorganic
  • 12% Water
  • 2% Organic
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5
Q

What does etching do?

A
  • Creates microspores
  • 5-50 microns deep
  • Increases surface energy
  • Increases wettability
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6
Q

What is the composition of Dentin?

A
  • 50% Inorganic
  • 25% Organic
  • 25% Water
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7
Q

What is sclerotic dentin?

A
  • Normal Aging
  • Abrasion
  • Erosion
  • Hypermineralization
  • Less receptive to bonding
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8
Q

What is reparative dentin?

A
  • Results from caries/dental procedures
  • Hypermineralization
  • Less receptive to bonding
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9
Q

What percent does the dentin smear layer reduce dentin permeability?

A

86%

  • Produced by instrumentation
  • Composition: cut dentin debris, bacteria
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10
Q

How thick is the dentinal smear layer?

A
  • 0.5 - 5.0 microns
  • Will not wash off
  • Weak bond to tooth
  • Very soluable
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11
Q

What does a 4th generation bond system look like?

A
  • Conditioner (etchant)
  • Primer (hydrophilic)
  • Adhesive (hydrophobic)
  • Etch and Rinse

Example - Optibond FL, Scotchbond multi-purpose

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12
Q

What does a 5th generation bond system look like?

A
  • Attempt to simplify…
  • Reduce number of bottles
  • Etch and Rinse…
  1. Conditioner (etch)
  2. Combined primer and adhesive
  • More susceptible to hydrolysis over time…

Example: Optibond solo

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13
Q

What does a 6th generation bond system look like?

A
  • No phosphoric acid!
  • Combined conditioner and primer
  • Clearfil SE!
  • Separate adhesive
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14
Q

What does a 7th generation bonding agent look like?

A
  • “All in one”
  • Combined conditioner, primer and adhesive
  • One step
  • No mixing
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15
Q

What does conditioner (etch) do to the tooth?

A
  • Chemical alteration of the surface
  • ie: phosphoric, citric, maleic, nitric
  • Removes dentinal smear layer
  • Exposes collagen fibrils
  • Simultaneous enamel etch
  • Rinse
  • Keep moist
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16
Q

What does a primer (wetting agent) do?

A
  • Hydrophilic monomers
  • Displaces water
  • Promotes infiltration into collagen
  • Lightly air dry
  • Transforms hydrophilic to hydrophobic
  • This is better for composite which is hydrophobic!
17
Q

What does adhesive resin do?

A
  • Chemically binds to primer

- Links primer to resin composite

18
Q

What is the hybrid layer?

A

The hydrophilic resin infiltrated surface layer of collagen fibers in demineralized dentin

19
Q

A separate enamel is etch is more predictable then self etches…T/F?

20
Q

Study that supported optibond FL use (3 Step)…

A
  • Van Meerbeek Study - 100% retention at 3 years for NCCLs

- Boghosian - 97% at 13 years

21
Q

What do studies show about etch and rinse (two step)?

A
  • Optibond Solo
  • Swift - 93% retention at 3 years for NCCL
  • More susceptible to hydrolysis at hybrid layer
22
Q

If you are using a self etch bond system are you going to use phosphoric acid?

23
Q

Have controlled clinical studies found any difference in post op sensitivity between etch and rinse and self etch bonding systems?

24
Q

Does research support better bond strength with Clearfil SE it if is refrigerated?

A

Yes!

More Shear Bond Strength….

25
What do studies show about a self etch 2 step Clearfil SE to NCCLs?
- Van Meerbeek - 100% retention at 2 years - Van Dijken - 98% at 8 years - Peumans - 86% at 13 years
26
According to systematic reviews, what restoration type has the lowest failure rate regarding cervical restorations?
1. Glass Ionomers 2. 3-Step Etch and Rinse 3. 2-Step Self Etch 4. 2-Step Etch and Rinse 5. 1-Step Self Etch According to the Schwendicke Systematic Review
27
What common denominator do two-step etch and rinse and one step self-etch bonding systems have in common? Is this good?
Acidic Monomers - They are not good! Weaker bond...More susceptible to hydrolysis
28
What are MMPs?
Matrix Metalloproteinases
29
Where are MMPs found in teeth?
Naturally occurring in collagen in tooth structure
30
What induces MMPs?
Caries Phosphoric Acid
31
What inhibits MMPs?
Chlorhexidine One could... Apply CHX after acid etching, acidic conditioner, rinse, dry, CHX, dry, primer, dry, adhesive, cure According to a systematic review by Gostemeyer - Beneficial effect is NOT supported by evidence Impact of disinfection remains unclear