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15 Cards in this Set
- Front
- Back
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Benefits of CH liner
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Insulation, barrier for fluids, reparative dentin, fluoride release, antibac.
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Calcium hydroxide paste system:
1) Base 2) Paste 3) Filler 4) Setting reaction accelerated by: 5) Soluble in water? 6) Setting time? |
1) Base - calcium hydroxide
2) Catalyst = salicylate (weak acid, reacts with calcium) 3) Filler = titanium oxide 4) Water 5) 3 mins 5) Yes |
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What was the original glass ionomer?
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ASPA - aluminofluorosilicate glass polyacrylic acid
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What is glass ionomer liquid?
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Aqueous solution of polyacids
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What are glass ionomer particles?
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Calciumfluoroaluminum silicate, Barium or ZnO for radioopacity
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Advantages of glass ionomer
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Chemical bond to tooth , good seal
Leach fluoride Strong Coeffecieint of thermal expansion similar to tooth |
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Disadvantages of glass ionomer
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Slow initial set, slow final set
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Glass ionomer adhesion
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Ioninc bonding with calcium and phosphate ions of tooth tstructure
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Vitrebond
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light cured glass ionomer, initial set due to photo-initiated polymerization
delayed setting due to acid/base |
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Glass ionomer vs. RMGI structure?
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Glass - polyacid chains do not connect
RMGI - polyacid chains connect |
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What crosslinks polyacid chains in RMGI?
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Pendent methylacrylate group
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Photopolymerization:
1) Activator 2) Photosensitive intiatiator 3) Accelerator Absorb what wavelength of light? |
1) Visible light
2) Diketone 3) Amine 470 nm (camphoquinone) |
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Purpose of:
1) CH liner 2) ZOE base |
1) Stimulate reparative dentin
2) added insulation, resistance to condensation during placement of amalgam, temp filling material, base, liner, cement |
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Main advantage of ZOE
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neutral ph, eugenol is soothing to pulp if dentin is thick enough (0.5-1.0mm)
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Disadvantages of ZOE:
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No chemical bonding, highly soluble, irritation to soft tissue if dentin too thin, low strength
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