2. Adhesive Dentistry, I Flashcards
Adhesion:
nA material, usually a ____ fluid, that joins two substrates together and solidifies
viscous
Prerequisites for Effective Adhesive Dentistry
wEtch/Prime: ____ dissolution of the enamel or dentin to enhance intimate contact of adhesives with substrate
wBond : infiltration of ____ resin into demineralized enamel and dentin which enables bonding of resins to the surface -
-____ RETENTION
acidic
unfilled
micromechanical
Principles of Adhesion Dentistry
Bonding Agent/Adhesive:
w____ that penetrates and establishes intimate contact with the conditioned tooth, polymerizes, and forms a strong bond between substrate and the restorative material.
monomer
Principles of Adhesion Dentistry
wBonding agent needs ____ contact between it and the conditioned substrate (enamel, dentin, and/or cementum)
l____ action
l____ the surface well
close
scrubbing
wet
Principles of Adhesion Dentistry
wEnamel Adhesion:
n Bonding agent is the ____ into treated enamel
n ____ penetrates into etched surface
n Formation of ____ into porosities
scrubbed
resin
resin microtags
Principles of Adhesion Dentistry
wDentin Adhesion:
n Resin tags infiltrate
demineralized ____
n Adhesion to ____ is less strong than adhesion to ____
dentin
dentin
enamel
Principles of Adhesion Dentistry
uDentin Adhesion:
nBonding resin penetrate and polymerize in the etched, open ____, forming resin tags
nBonding resins also penetrates the ____
dentinal tubules
intertubular dentin
Dentin Adhesion
wAdhesive strength to dentin is less than enamel
w Why?
[???]
ANSWER ME
Challenges in Dentin Adhesion
- MUST remove the ____ -Requires a procedure to
etch or prime the dentin - Deeper preparation into dentin = less ____ substrate = less ____
-Therefore: Deeper preparation into dentin = less ____
smear layer
mineralized
retention
bond strength
Challenges in Dentin Adhesion
Gap Formation at the Resin-Dentin Interface
Dentin bond strengths ____ than enamel bond strengths
Composite resins ____ as they polymerize, creating stresses within the composite material
Pulls away from substrate = ____ discrepancy = “____”
less
shrink
marginal
gap formation
Different Adhesive System Clasifications
n “____” - Etch and Rinse procedure
n “____” - Adhesives that have etching capacity built into the material but NO rinse step
n “____” – Combination of both above
total etch
self etch
selective self etch
Different Bonding Systems
wTotal Etch technique: n Developed in the 1990’s n Still used effectively n \_\_\_\_ etching of the entire preparation (\_\_\_\_) with \_\_\_\_ Acid n \_\_\_\_
simulataneous
dentin and enamel
phosphoric
rinse and dry
Total Etch Technique w\_\_\_\_ phosphoric acid n \_\_\_\_ second etch on enamel n \_\_\_\_ second etch on dentin n Rinse time \_\_\_\_ seconds
w____ Step System and ____ Step System
30-40%
15
10
5-10
3
2
Total Etch Technique - 3 Step System
w 3-steps: 1st : \_\_\_\_(conditioning) l\_\_\_\_ off lDemineralizes \_\_\_\_ lRemoves the \_\_\_\_ layer in dentin lOpens the \_\_\_\_ lIncreases enamel/dentin \_\_\_\_
acid etching rinsed enamel smear dentinal tubules permeability
Total Etch Technique - 3 Step System
2nd : ____
lWets and penetrates porosities
lPrimer molecules contain two functional
groups:
w____ group: has affinity for the tooth substrate
w____ group: has an affinity for unfilled resin that follows
primer
hydrophilic
hydrophobic
Total Etch Technique - 3 Step System
3rd : ____ (unfilled resin)
l____ onto the treated surfaces
lTogether with the Primer penetrates the treated enamel and opened dentinal tubules
Then: ____ to set bonding agent
bonding
scrubbed
light cure
Total Etch Technique - 2 Step System
wSimplified 3 Step Systems
wStill use “____” technique
wCombined Steps 2 and 3: ____ are combined
total etch
primer and bonding agents
Total Etch Technique - 2 Step System
w Advantages:
n ____ to use
n Bond strengths sometimes were ____
w Disadvantages:
n Greater post operative ____ in some
2 Step products
n Some adhesives NOT ____ certain kinds of composite materials
easier
improved
sensitivity
compatible
Total Etch Technique - 2 Step System
w2 Step Systems Used in PreClinic:
n ____
prime & bond NT
Different Bonding Systems
wSelf Etch technique:
n Developed recently
n ____ etching of the entire preparation (____) with ____ Primer – but NOT ____ Acid
n Do Not rinse/just ____ dry
simultaneous dentin and enamel acidic phosphoric air
Self Etch Adhesive System
w Uses an \_\_\_\_ primer to etch enamel and dentin simultaneously n Not \_\_\_\_ acid n NOT \_\_\_\_ OFF n Less acidic than phosphoric acid lWhy does this matter?* n Only \_\_\_\_ dried
acidic
phosphoric
rinsed
air
Self Etch Adhesive System
wSelf-etching adhesive systems:
n ____ motion is required
lWhy is this important?*
-Self-etching bonding agents dissolve the smear layer without ever exposing ____
n Minimizes post-operative sensitivity lHow?
-No ____ of the primer; never opening the ____ to the environment
scrubbing
dentinal tubules
rinsing/drying
dentinal tubules
Self Etch Adhesive System
wAdvantage of eliminating the rinsing and drying step:
n Reduces the possibility of ____ the dentinal tubules - “____” (that can happen in total etch procedures).
n Desiccaiton = collapsing of dentinal tubules that occur with overdrying = less ____
n Eliminates guessing “how ____” for the dentin with Total Etch
overdrying
desiccation
penetration
dry is dry enough
Self Etch Adhesive System
wPrime and Bond Elect Steps:
Scrub primer around the ____ and into the entire ____ thoroughly, do not rinse; air dry
Then ____cure
margins
prep
light
Self Etch Adhesive System
The Self Etch material used in preclinic:
n ____
prime and bond elect
Different Bonding Systems
wShortcoming of Pure Self Etch Systems: Enamel demineralization /marginal seal ____ than with Phosphoric acid*
**Research has shown: The use of Phosphoric Acid to etch the enamel ____/and or enamel ____ of the preparaion as an initial and additional step has increased the overall bond ____ of the restoration
This is the why the newer “____” Technique came to be developed
weaker cavosurface bevel strength selective-etch
Different Bonding Systems
wSelective-Etch technique:
n Phosphoric Acid etching of only the
____ margins of the preparation
n ____
Follow with
n ____ etching of the entire ____ preparation with Self Etch Primer - NOT ____ Acid
n Do Not rinse/just ____ dry
enamel
rinse and dry
simultaneous
internal
phosphoric
air
Selective-Self Etch Adhesive System
wExtra Step – Based on Research:
1st: Etch enamel ____ and/or ____ areas first with Phosphoric acid to increase marginal bond strength
lDo not get etchant into the ____ itself
lThen proceed with the Self Etch System according to manufacturers instructions
cavosurface
bevel
preparation
Composite Resin Composition
n Primary components
l____ Phase – liquid resin liquid
l____ Phase – reinforcing particles or fibers within the matrix
l____ to promote adhesion between the filler and the matrix
Complex composition – covered in Dental Materials
matrix
filler
bonding agent
Composite Resin Composition
n Compositions vary by ____
lEach material is a proprietary mix of ____ forming the matrix, as well as engineered filler ____ and glass ____.
manufacturer
resins
glasses
ceramics
Composite Resin Composition
wComposite Resins are divided into types: 1. Unfilled Resins no \_\_\_\_ particles 2. Filled Resins a variety \_\_\_\_ materials
filler
filled
Composite Resin Composition
wTypes of Unfilled Resins:
n ____ - adhesive layer
n ____ sealer/____ glaze
Thin, ____ top coat, but not used as a ____ material
bonding agent restoration clear viscous restorative
