Quiz 1B Flashcards
Layer of debris (organic and inorganic material) that forms onto the enamel and dentin when prepared with rotary instruments?
smear layer
Layer a few microns thick and weakly adheres to the substrate; also lowers the surface energy?
smear layer
What must be removed or penetrated by the adhesive (usually by acid etching)?
smear layer
What is a strong acid solution, such as phosphoric acid solutions and gels 35-37%, that is also called conditioners?
etchants
Hydrophilic monomers to produce good wetting that is usually carried in a solvent (acetone, ethanol, water)?
primers
What component of the material of the bonding system is HEMA found in?
primer
What does the HEMA molecule look like?
has hydrophilic & hydrophobic end
Hydrophobic, dimethacrylate oligomers compatible with the primer and composite monomers (primary sources of color)?
adhesives
What are light cured, an activator like camphoroquinone and organic amine, or dual-cured catalyst for self curing?
initiators and accelerators
What gives bonding agents a higher bonding strength?
fillers
What are some other ingredients in the composition of bonding materials?
fluoride, antimicrobials (gluteraldehyde)
What occurs after etching primarily by micro-mechanical retention removing the smear layer HA crystals by dissolution?
enamel bonding
What indicates macro-spaces formed after enamel bonding?
frosty appearance
What forms by etching with phosphoric acid gel to aid enamel bonding?
macro and micro tags
What is more numerous and contributes most to micro-mechanical retention?
micro tags
What flows in the micro/macro tags (micropores) irregularities?
primer and adhesive
What forms the resin tags when cured?
primer and adhesive
What are the three procedures of dentin bonding?
1) Etching
2) Priming
3) Bonding
What does etching do?
removes smear layer
removes HA from outer dentin layer
exposes collagen sponge layer
exposes dentin tubules
Why must care be taken after etching to prevent drying?
to keep dentin surface and collagen layer from collapsing on itself, thus preventing penetration by the primer, thus bonding will fail
The primer forms what layer?
hybrid layer
The process of impregnation of the etched dentin by the resin in the primer?
the hybrid layer formation
If the hybrid layer fails to fully impregnate with primer, what happens?
space creates mechanically weak zone
Primers have solvents that do what?
enhance wetting
carry the monomers into the tags
To ensure to carry the monomers deep as the solvent evaporates, what can we do?
apply several layers of the primer
