Term
(1) Give three reasons for etching enamel in bonding.
(2) aka "etching enamel"
(3) etching enamel leaves what on the surface?
(4) after priming, what is formed? |
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Definition
(1) (removing smear layer)
-provides good micromechanical undercuts
-higher surface energy
-predictable bonding
(2) conditioning
(3) collagen network
(4) hybrid layer |
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Term
(1) what is formed after adhesive is cured?
(2) what is the 'hybrid layer'?
(3) T/F: dentin is more acid resistant than hybrid layer.
(4) define dental primer |
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Definition
(1) copolymerisation with composite
(2) band of resin-reinforced dentin
(3) False
(4) hydrophilic monomer for wetting demineralized surface and exposed collagen
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Term
(1) why is "wetting" important in dental bonding?
(2) define dental adhesive
(3) Why should care be taken to not dessicate dentin following rinsing of etchant? |
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Definition
(1) a translating material - allows hydrophobic adhesive to bond to hydrophilic dentin/enamel.
(2) curable monomer for mechanical bonding within enamel microporosities and dentin collagen.
(3) may collapse collagen network - decreases opportunities for micromechanical retention. |
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Term
| Compare the various "generations" of adhesive systems in terms of their composition and basic application procedures. |
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Definition
4th generation
-3 steps: etch + prime + bond
5th generation
-2 steps: etch + (prime and bond)
6th generation - no phosphoric acid
-2 steps: self etch(etch and prime) + bond
7th generation
All-in-one |
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Term
(1) What are the different classifications of self-etch acidity type? Give respective pHs.
(2) Give Kerr's brand for 4th-7th generation adhesives.
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Definition
(1) Mild: pH ~2
Intermediary strong: pH ~1.5
Strong: pH <1
(2) 4th gen: Optibond FL
5th gen: Optibond Solo Plus
6th gen: Optibond Solo Plus SE
7th gen: All-in-One |
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Term
Give compositions for:
(1) 4th gen: -etch, primer, adhesive composition
(2) 5th gen: etch, primer/adhesive composition
(3) 6th gen: -etch/primer, adhesive composition
(4) 7th gen: -etch/primer/adhesive composition |
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Definition
(1) -phosphoric acid
-HEMA/polyalkenoic acid/water*
*acetone or ethanol can be solvents
-bis-GMA/HEMA
(2) -phosphoric acid
-HEMA/dimethacrylates/other monomers/acetone*
*ethanol can be solvent
(3) -acid phosphate monomer/water*/HEMA
*acetone or ethanol can be solvents
-HEMA/dimethacrylates/silica/other monomers
(4) -acid phosphate monomer/dimethacrylates/water*/HEMA
*acetone or ethanol can be solvents
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Term
(1) Explain steps in application of 5th Gen Adhesive
(2) Explain steps in application of 6th Gen Adhesive
(3) Explain steps in application of 7th Gen Adhesive |
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Definition
(1) -follow etch procedures for 4th Gen
-scrub on primer/adhesive
-dry with gentle air flow
-light cure
(2) -apply etch/primer for 30 secs
-dry with gentle air
-wait 20 secs, apply adhesive
-light cure 10 secs
(3) -mix etch/primer with adhesive
-apply with pressure for 15 secs
-dry with gentle air
-light cure 10 secs
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Term
| List the two compatible and two incompatible adhesives. |
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Definition
Compatible:
- Total etch, 3 step system
- Self etch, 2-step system
Incompatible:
- Total etch, 2-step system: residual acid present from primer/adhesive
- Self etch, 1-step system: residual acid present from etch/prime/adhesive
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Term
| Do filled adhesives provide a stronger bond? |
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Definition
| No evidence for enhanced strength or bond, because filler level too low. |
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