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24 terms

Week 4 Dental Cements, Bases and Liners

STUDY
PLAY
acid-base
most of the chemistry of dental cements are governed by a simple _______-________ reaction.
zinc oxide
this powder is one of the oldest dental cements and is the only insoluble, nontoxic, reactive oxide that can react with an acid; possesses some antibacterial properties.
glass ionomer, resin, and resin ionomer
what are the three different types of glass powders that can be used as dental cements?
glass ionomer cement
this glass powder bonds CHEMICALLY to calcium and releases FLUORIDE. however it can be acidic and cause pulpal irritation; absorbs water
resin cement
this glass powder bonds MECHANICALLY and is extremely strong; they bond to both the tooth and restoration
resin ionomer cement
this glass powder is a contemporary alternative today and is a combination of properties of both resin and glass ionomer cements. releases fluoride.
Eugenol
this cement liquid is also known as "oil of cloves" and can cause pulpal necrosis
composite
eugenol must never be used in any ____________ restoration procedure. it inhibits free radical polymerization essential to the setting.
phosphoric acid
this cement liquid is very irritating to the soft tissues
polyacrylic acid
this cement liquid is very viscous and contain carboxyl group that bond calcium to the tooth structure.
luting agent, pulp protection, tempoary restoration, cavity sealers.
what are some of the uses of a dental cement?
ZOE, Zinc Phosphate, and Zinc Polycarboxylate
what are three metal oxides/acid liquids used as a luting cement?
Zinc Oxide and Eugenol
this is a weak luting cement that causes temporary cementation of indirect restorations
Zinc phosphate
this is a very strong luting cement that dissolves solwly and is used for permanent cementation of indirect restorations.
Zinc Polycarboxylate
this is a low to moderate strength luting cement and combines the ease of handling a polymer with the moderate strength of zinc oxide.
primary consistency
this consistency is when luting cements have a thin viscosity to fill this space (i.e. honey)
secondary consistency
this requires the addition of powder to increase strength and bring the cement to a thick, putty-like consistency.
particle size, temp, and cement powder/liquid ratio
what are 3 factors that can influence the consistency of mixed cement?
varnish
this is a thin layer if material placed on the floor and walls of a preparation to seal dentinal tubules and minimize microleakage; THEY EVAPORATE QUICKLY
copalite
_______ cannot be used under resins or in bonding procedures
liners
_____ serve 3 functions: 1) change the chemistry of the tooth surface, 2) irritate the pulp to form secondary dentin and 3) to bond filling material to a tooth
Dycal
______ has a pH of 9 and 11 which makes it highly bactericidal.
Bases
______ are mixed to a secondary consistency and are thicker and stronger than liners. they provide thermal insulation.
liner--base--varnish
what is the order of placement?