Adhesives, sealants, cements, liners, bases, and waxes Flashcards
What is sealant material?
BisGMA-TEGDMA system but no filler
I sealant bonding chemical or mechanical?
Mostly mechanical
What physical feature of enamel provides the majority of retention?
Microtags
Why is the oxygen inhibition layer important to consider when dealing with sealants?
Oxygen interferes with radical polymerization, the surface of VLC materials are often uncured
Adhesive layer has what character?
Has both hydrophilic and hydrophobic character
Describe adhesive failure.
The adhesive fails to hold the composite to the dentin
Describe cohesive failure.
The adhesive holds to the dentin and composite but the adhesive separates from itself
Describe structural failure.
The dentin or composite fails
What is a smear layer?
Ground collagen and HA that is adhered to a surface; this interferes with bonding
What are the 4 traditional steps for dentin bonding?
Etch, prime, adhesive, and restoration
What is the composition of typical dentin etch?
30% H3PO4
What is the primer?
A hydrophobic monomer used to stabilize the dentin. (keeps collagen fibers from collapsing)
Glass-ionomers can be used as what?
Cements and bases
Zinc oxide eugenol (ZOE) can be used as what?
Cement, liner, and a base
Calcium hydroxide can be used as what?
Liner and a base
What are cements used for?
Binding restorations of appliances to tooth structure
What are 4 water based cements?
Glass-ionomers, resin modified glass-ionomers, zinc phosphate, and zinc polyacrylate
What are two resin based cements?
Composites and compomers
What is an oil based cement?
Zinc oxide eugenol
What is a liner?
A relatively thin layer of material used to protect the dentin from residual reactants that diffuse out of the restoration or oral fluids that may penetrate leaky restoration interface
What are three kinds of liners?
Solution liners, suspension liners, and cement liners
What is the thickness of a solution liner?
2-5 micrometers
What is the thickness of a suspension liner?
20-25 micrometers
What is the thickness of a cement liner?
200-1000 micrometers
What is indirect pulp capping?
When a preparation is <0.5mm to the pulp calcium hydroxide liner is applied
What is direct pulp capping?
When a preparation exposes pulp a dentist would place a direct pulp cap (calcium hydroxide liner)
Calcium hydroxide liners stimulate what biologic process?
Reparative dentin is stimulated by this
How does CaOH work?
Releases hydroxide ions (pH>11) and when ionized in low concentration odontoblast formation is stimulated
What are three sedative restoration materials?
Reinforced zinc oxide eugenol, resin modified glass ionomers (RMGI), and glass ionomers (GI)
ZOE has what that acts as obtundant (dulls pain)?
Oil of clove
Why use a liners and bases?
To protect the pulp and minimize post-op sensitivity; acts as thermal and chemical barrier, controls inflammation of the pulp, and controls fluid movement
What are the advantages of glass ionomer?
Adheres to tooth structure, fluoride release, proven clinical record or retention (better than composite), dimensionally stable, and biocompatable
What are the disadvantages of glass ionomer?
Slow setting, early dissolution, optical properties, stain resistance, and poor physical properties
What are five properties of waxes?
Temporary materials, should melt at lower temperatures, be carveable, burn off, and be dimensionally stable
