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what is used to seal dentin or medicate the dental pulp?
liners
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varnish, calcium hydroxide, zinc oxide eugenol, and resin modified glass ionomers are all examples of what?
liners
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what stimulates reparative dentin?
calcium hydroxide
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what type of liner is contraindicated with composite?
zinc oxide eugenol
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what is used to provide thermal insulation or mechanical protection for the dental pulp?
bases
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what are examples of bases? why?
ALL cements because they are poor thermal conductors and have adequate compressive strenght
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what is used to affix a restoration to tooth structure or as a base?
cements
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what type of cement is mixed on a cool glass slab? why?
zinc phosphate cement-exothermic reaction when mixing (glass slab cools it down)
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zinc phosphate cement causes a ____ interlock between the tooth and castin
mechanical
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what type of cement has a high chemical affinity for enamel?
polycarbonzylate cement
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what is mixed together with a polycarboxylate cement?
powered with polyacrylic acid
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what does a glass ionmer cement bind to?
DENTIN
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t/f glass ionomer is fluoride releasing
true
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what type of cement can be used for a class V restoration?
glass ionomer
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what is the strgonest dental cement?
resin cement
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what type of cement is tooth colored what can it be used on?
- resin cement
- porcelain laminate veneers, inlays, crowns, clear ortho brackets
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what type of cement is used for luting etched metal retainers, bonded bridges and prefabricated endodontic posts?
resin cements
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what is the least soluble dental cement?
resin cement
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what cement is a resin modified glass ionomer?
hybrid cement
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t/f hybrid cements release fluoride
true
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what is the weakest dental cement?
zinc-oxide eugenol
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what is used to clean zoe contaminated instruments?
orange solvent
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in most cases dental cements have _____ strength and high ______ when compared to other restorative materials
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t/f all dental cements have not adhesive properties
FALSE-resin and glass ionmers have adhesive properties due to bonding procedure before placement of cement..all others do not have adhesive properties
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what stimultaes secondary dentin for pulp capping?
calcium hydroxide (alkaline pH)
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what are the three protective layers of dental cements?
- cavity-varnish
- liner/low-strength base
- high-strenght base
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what is used for pulp capping?
calcium hydroxide
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high strenght base proveds how many mm for thermal protection under metal?
.5mm
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what 2 things does a high strength base provide for restorations?
thermal insulation and mechanical support
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what mustthe thickness of the high strength base be for protection?
.5mm or greater
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high strength bases provide thermal prtection of ______ restorations
metallic
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cements used as temporary fillings are for what purpose?
sedative-evaluate response of pulp before final restoration
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what is the strongest cement?
resin cements-highest in mechanical strength
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how can you increase the strength of cements?
increase powder to liquid ratio
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adding powder to cements increases ______ and ______ but decreases ______ of cement
- viscosity and strength
- solubility
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when is a dual cure cement used?
in thicker restorations that the light cannot penetrate
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t/f alcohol gauze be used for cleanup of cement instruments
true
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how much the ZOE be mixed for intermediate restorations?
2 consistancy
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what is ZOE used for?
- TEMPORARY CEMENTATION
- Temporary and Intermediate restorations
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what is used as a sedative effect on the pulp?
ZOE
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what interferes with polymerization of resins?
ZOE
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when should ZOE not be used?
undeer composites, before final cementations with hybride glass ionomer or resin cements
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if ZOE is set up on slab before clean up what should be used to clean it up?
alcohol or orange solvent
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zinc phospahte has a ______ reaction that is ______
-
what type of cement do you use incremental incorporations of powder into liquid on a cool glass slab
zinc phosphate
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what should zinc phosphate be mixed on?
cool glass slab
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why must a large area be used when mixing zinc phosphate
dissipate heat, lengthen working time neutralize chemicals
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how does the zinc phospate start out?
acidic pH 4.2
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when does the zinc phosphate become neutral?
24-48 hours
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what is the liquid in the zinc polycarboxylate?
polyacrylic acid
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what cement causes minimum pulpal irritation?
zinc polycarboxylate
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zinc polycarboxylate has high _____, low _____ _____and it has a ______ and _____ retention
- visocosity
- compressive strength
- chemical and mechanical
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t/f when the zinc polycarboxylate loses its gloss and becomes stringy is when it should be applied to the tooth
FALSE it is no longer usable when it loses its gloss and becomes stringy
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what type of retention does the polycarboxylate have?
chemical and mechanical retention
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what type of bond does the glass ionomer cements have?
chemical bond with tooth structure
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what cement is known as a high strength
glass ionomer cements
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t/f glass ionomer cements are high strength bases?
true
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what adds radiopacity?
barium
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t/f traditional glass ionomer was not fluoride releasing but now it is?
false! traditional glass ionomer is fluoride releasing
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what needs to be done to the margins of a glass ionomer?
coat with agent or varnish to protect from moisture
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the fluoride releasing of traditional glass ionomers may have what type of effect?
anti-cariogenic
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what is the composition of hybrid ionomer cement?
similar to glass ionomer but with addition of RESIN
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what is added to the hybride ionomer cement that isn't in glass ionomer?
resin
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when is the hybride ionomer cement not used and why?
cementing all ceramic indirect restorations becuase of fracture risk due to expanision (absorbs moisture after setting)
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most metal free indirect restorations can only be cemented with what type of cements?
resin cements
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