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33 Cards in this Set
- Front
- Back
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Which layer is "infected" and which is "affected" in Carious dentin?
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Outer layer is "infected"
Inner layer is "affected" |
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In a Caries Detector, what does the dye bond to, and where is this present?
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Bonds to denatured collagen which is in the outer "infected" dentin.
Not present in the inner "affected" dentin. |
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How should you ALWAYS excavate caries?
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ALWAYS excavate from the PERIPHERY inward.
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What 2 locations should you NEVER start the excavation of decay?
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Never start at center of pulpal floor or along axial wall.
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What is Benzalkonium Chloride (BAC)?
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An antibacterial agent which creates a residual bacterial inhibition zone of up to 7 microns.
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How does GLUMA work?
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By coagulating plasma proteins and forming a series of occluding coagulation plugs and also by killing bacteria.
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An 11 degree (C) increase in pulpal temperature can result in a ___% chance of necrosis.
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60%
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What are the criteria for a successful Indirect Pulp Cap?
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Positive pulp vitality
No recurring or spontaneous pain except thermal No apical pathology Not tender to percussion No swelling |
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Criteria for a successful Direct pulp cap?
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no spontaneous or recurring pain except thermal
no swelling normal vitality tests not tender to percussion no periapical pathology pink pulp able to arrest bleeding pulp with peroxide or sodium hypochlorite |
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3 Steps in indirect pulp capping?
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Calcium hydroxide base (Dycal) placed over dentin <0.5mm thick.
Glass-ionomer liner (Vitrebond) placed over the CaOH. Add resorative material |
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What do you treat pulpal exposure with?
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MTA - Mineral Trioxide Aggregate
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What is the basis of all composites
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Bis-GMA
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What is Bis-GMA thinned with and why?
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diluents
to increase flow, strength, and improve handling |
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If there are more filler particles, will there be more or less shrinkage?
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LESS
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Why do flowables shrink more?
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Because they are mainly the monomer, with little filler
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Shrinkage is proportional to....
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the volume of resin in the cured composite
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How are Fillers classified?
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Shape - spherical or irregular
Size - Macro (>1 micron), Micro (< 1 micron), Nano (1000th of a micron) |
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What are some examples of filler materials?
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SILICA, barium, quartz...
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What are coupling agents used for?
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to improve adherence of the resin to the silica filler
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What coupling agent chemically coats filler surfaces and increases strength by transferring stress to the filler particles?
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Silane
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What is Silane very sensitive to?
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moisture
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What 3 types of catalysts are there?
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chemical (mixing base and accelerator)
photochemical (use of blue light to set) Heat |
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What type of bond is formed between bonding agents to enamel and dentin?
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Micro-mechanical
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What type of bond is formed between composite and the bonding agents?
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chemical
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What is the 2 step total-etch adhesive procedure?
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etch with acid, rinse, prime+bond
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What allows us to add subsequent layers of composite?
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oxygen inhibition layer
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The hybrid layer is approx. ___% resin and ___% collagen.
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70% resin and 30% collagen
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What gets rid of water in the prep?
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Priming agent.
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What is the most common source of post-operative sensitivity from composite restorations?
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Microleakage
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Bevels ______ the surface area of bondable enamel.
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increase
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Beveling is designed to do what?
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expose the enamel rods end-on.
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What are the types of dental composite?
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Flowable - light body
Microfills - medium body micromatrix - medium body packable - heavy body |
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What is the peak wavelength of camphoroquinone?
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468nm
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