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61 Cards in this Set

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  • Back
What is a cavity sealer?
It provides a protective coating for prepared dentin but does little for post-op sensitivity. It basically seals off the dentinal tubules short term. For use under amalgams and crowns
What is a cavity liner?
A cement or resin coating placed over dentin as a barrier between tooth and restorative material. Usually used in increments of 0.5 mm or less.
What is a cavity base?
It is basically just a thick liner used in bulk thickness to replace missing dentin and support final restoration.
What are 2 types of cavity sealers?
Varnish (Copalite) and adhesive sealers (Amalgambond, Prime & Bond, GLUMA).
What is GLUMA and what are its uses?
It is a cavity sealer and desensitizer. It can also be used as a rewetting agent prior to applying adhesive bonding agent. It coagulates plasma proteins to form a plug to seal off the tubules. It also aids in cross-linking of collagen fibers to increase bonding
What are the 2 main types of cavity liners?
CaOH (Dycal) and GI (Vitribond).
Do you have to etch the tooth prior to applying a cavity liner?
No, it adheres to tooth structure without etching (ie GI bonds chemically with dentin instead of micro-mechanical)
When would use of Dycal be indicated?
When you have a deep cavity prep within 0.5 mm of the pulp. It is fragile and must always be covered with GI
Advantages of Dycal
It is antibacterial due to pH of 12, it stimulates reparative dentin, and self cures in 2 minutes
Application of Dycal
Only apply sparingly over the deepest part of the prep, taking care to keep it off the prep walls and cavosurface margins.
Use of GI as a cavity liner
Antibacterial due to fluoride, very good bond to dentin but not to enamel, must be light cured. Use it to cover CaOH liner.
What are the 4 different types of cavity bases?
Zinc Oxide with eugenol (ZOE), zinc phosphate, GI, and polycarboxylate
When is use of a cavity base indicated?
Used when you're trying to get back to ideal prep form. You fill in the prep with GI and then you can cut it back down to shape the prep how you want it. Good for undercuts on crown preps too
Uses and advantages of ZOE (IRM)
It is palliative for the pulp in deep cavity preps. It can be used as a base or an entire interim restoration. It has a good seal but low strength. NEVER USE UNDER COMPOSITE!!
What is polyacrylic acid?
It is used in polycarboxylate and GI to dissolve powder or glass components. It can also be used as an etch in place of phosphoric acid. It will remove the smear layer without demineralizing the dentin.
Use of GI as a cavity liner
Antibacterial due to fluoride, very good bond to dentin but not to enamel, must be light cured. Use it to cover CaOH liner.
What are the 4 different types of cavity bases?
Zinc Oxide with eugenol (ZOE), zinc phosphate, GI, and polycarboxylate
When is use of a cavity base indicated?
Used when you're trying to get back to ideal prep form. You fill in the prep with GI and then you can cut it back down to shape the prep how you want it. Good for undercuts on crown preps too
Uses and advantages of ZOE (IRM)
It is palliative for the pulp in deep cavity preps. It can be used as a base or an entire interim restoration. It has a good seal but low strength. NEVER USE UNDER COMPOSITE!!
What is polyacrylic acid?
It is used in polycarboxylate and GI to dissolve powder or glass components.
Resin modified glass ionomer
Fuji II is commonly used, it has the best overall properties for compressive strength, thermal conductivity, solubility, and bond strength. It also releases fluoride and can remineralize the tooth
What is unique about GI?
Chemical bond between GI and dentin. This is about the only time we get a chemical bond between a material and dentin
What are the various uses of GI?
Restorative material, liner, base, and cement.
How do liners and cements differ?
They work the same, its just that the particle size is smaller in cement in order to achieve thinner film thickness.
You shoud pre-condition the tooth prior to using GI to cement a full crown.
False
When is use of a liner not necessary?
When there is more than 1.5mm of remaining dentin thickness on the floor of the prep.
What is infected dentin?
The outer layer that is soft, discolored, non-vital and can't be remineralized
What is affected dentin?
THe inner layer that is uninfected, vital, and somewhat soft but is capable of being remineralized
How does caries detector work?
It dyes denatured collagen protein only found in the outer infected layer, not in the inner affected area.
What is sclerotic dentin?
It will stain with caries detector but isn't infected. Its very hard and often discolored. Doesn't need to be removed usually.
You should always excavate caries from the periphery inward (T/F)
True
Common methods of cavity disinfection
Chlorhexidine applied with micro-brush, benzalkonium chloride (BAC) which creates a bacterial inhibition zone and comes in some etchants, and GLUMA
What are the criteria for a successful indirect pulp cap?
Positive pulp vitality, no recurring pain except thermal, no apical pathosis, not tender to percussion, and no swelling.
What are the criteria for a successful direct pulp cap?
Positive pulp vitality, no recurring pain except thermal, no apical pathosis, not tender to percussion, no swelling, pink pulp, and ability to arrest bleeding pulp.
What are the numbers of toffelmire matrix bands?
#1 universal band, #2 medium MOD band, and #3 wide MOD band
What thickness of band do you use for composite and amalgam?
.001 dead soft for composite and .0015 soft for amalgam
Interproximal wedges should be placed coronally to the cavosurface margin (T/F)
False, it should always be gingival to the cavosurface margin of the box
How far occlusal and gingival to the prep should the band extend?
1mm below and 1mm above
When would you use the OptraMatrix selectively thinned matrix bands?
Only when restoring class II preps with composite, they help to facilitate better interproximal contact.
What are T bands?
They are a soft brass band that doesn't require any kind of retainer apparatus and can be assembled intraorally.
When would you use a copper band matrix?
When you need to restore a badly broken down tooth with almost no structure left.
What is the basis of all composites?
Bis-GMA. It is thinned with diluents to increase flow, strength, and handling.
What is the function of filler particles in composite?
It is added to help cut down on polymerization shrinkage. It is often quartz, silica, barium or strontium glass, or ceramic.
What percent of total composite volume is filler?
Typically 40-70%
How are composite fillers classified?
By shape, size and material. They can be spherical or irregular, macro, micro, nano, or hybrid.
Function of coupling agents in composite
It coats the filler and helps keep filler and resin together. It also aids in transferring stress to the filler particles. Silanes are most commonly used.
What component of composite is most sensitive to moisture?
The silane in the coupling agent will break down if exposed to moisture.
What is the function of the plasticizer in composite?
They are solvents which contain the catalysts and are non reactive to the catalysts or the resin.
What is the most common photochemical catalyst?
Camphorquinone, it needs light of 468nm wavelength to set properly. LED and PAC spectrum flux is 470nm, so it works great for CQ
What kind of bond does a bonding agent make with dentin?
It is micro-mechanical and is mostly a result of the intertubular matrix and the tubules to a lesser extent.
What kind of a bond do you get between the bonding agent and composite?
It is a purely chemical bond.
What is the most effective etch-adhesive procedure?
The two step total-etch approach that uses 34% phosphoric acid. We use gen. 5 bonding agents at UNLV
What is needed to remove the smear layer and why is it important?
You use 34% phosporic acid. It creates a 3-5 micron layer of demineralized dentin that allows micro-mechanical retention with bonding agent.
Why is it important not to over dessicate the tooth after rinsing an etching agent from a prep?
The dentin needs to stay moist to allow for maximum retention of the bonding agent in the collagen fibril network exposed by etching.
What is the most common and effective primer in bonding agents?
Ethanol. It acts to pull water out of dentin and replace it with resin monomers
What is the major draw back of self-etching bonding materials?
They don't effectively remove the smear layer and don't etch uncut enamel which can undermine marginal integrity. They are also semi-permeable to water so restorations fail more often.
What is the most common cause of post-op sensitivity from composite restorations?
Microleakage caused mostly by polymerization shrinkage
What is the purpose of adding a bevel to a prep?
It increases the surface area of bondable enamel by exposing the enamel rods end-on. It should be 0.5-1.0mm
What is C-factor?
It is the ration of bonded to unbonded surface areas in a restoration. You want this to be small in order to negate the effects of polymerization shrinkage
What is the thermal expansion coefficient of composite?
40 (enamel is 12, so this can create problems).
What is unique about the curing of BisCover?
It cures without a sticky oxygen inhibition layer