Cement Materials Flashcards
name three examples of luting agent material
zinc polycarboxylate
GIC/ RMGIC
composite resin luting agents
what is the ideal film thickness of a luting cement
25 micrometres
what are ideal properties of a dental luting cement
radiopaque
easy to mix
easy to use
film thickness 25 micrometres
low solubility
cariostatic
biocompatible
what must composite luting cements be used with
a suitable DBA
how is bonding to porcelain achieved
requires to be etched with hydrofluoric acid (sandblasted)
surface wetting agent - silane coupling agent
composite luting cement
DBA
what must be used when bonding a metal restoration to a tooth
dual cured material as light will not penetrate the metal
what is an example of a self adhesive composite resin
Panavia
what restorations can GIC be used to cement
MCC
metal post
zirconia crown
gold restoration
what restorations can a light cure composite and DBA be used to cement
veneer
what restorations can a dual cure composite and DBA be used to cement
fibre post
composite inlay
porcelain inlay
what can an anaerobic cure composite be used to cement
adhesive bridge
what dental material can be used as a temporary cement for restorations
zinc oxide
zinc oxide eugenol
why can eugenol containing materials not be used to cement the provisional restoration where the final cement will be resin
any residual eugenol will interfere with the setting of resin
name the five components of a dental ceramic
kaolin
quartz
feldspar
metal oxides
glass
what is the monomer in composite
BisGMA
what does the length of the monomer affect in composite
viscosity
polymerisation shrinkage
what does the filler particles in composite affect
wear resistance
polishability
aesthetics
compressive strength
what light wave is camphorquinone activated at
470 nm
what is unsupported enamel
enamel prisms that are sectioned/ cracked
bases that do not reach the EDJ
what does unsupported enamel in a cavity preparation cause
marginal failure
what is the hybrid zone
zone of collagen penetration into dentine surface
what is the smear layer
made up of contaminated dentine surface from the operator cutting the cavity
how does GIC come packaged
powder - calcium fluoro-aluminosilicate
liquid - acid with water
what are the three stages of GIC setting
dissolution
gelation and hardening
hydration
name 3 uses of GIC
luting cements
direct restorations
indirect pulp protection (over a pulp cap)
what is RMGIC
same as GIC but with the addition of HEMA
what are uses of RMGIC
provisional restorations
base liner under composite restorations
what is black’s cavity classification
I - posterior occlusal
II - posterior approximal involvement
III - anterior approximal
IV - anterior incisal edge
V - buccal cervical cavity
name three indications for FS
high caries risk
deep fissures
newly erupting molar
name an indication for PRR
evidence of enamel demineralisation in the fissure
what is a nayyar core
rubber dam placed
access cavity
remove 2-4mm GP from canals
pack with amalgam using narrow smith plugger
back amalgam into remaining cavity
what is an indication for a post
broken down root treated tooth with insufficient/ no ferrule
what are the two broad classifications of permanent luting cements
water based
resin based
what are examples of water based luting cements
GIC
RMGIC
zinc phosphate
zinc polycarboxylate
what are examples of resin based luting cements
self adhesive and adhesive resins
dual cure/ self cure/ light cure
what is zinc phosphate
water based cement
great mechanical retention but soluble in oral fluid
low pH (2) causes irritation to pulp
what is zinc polycarboxylate
bonds to tooth surface but not restoration
difficult to mix and soluble in mouth at low pH
what is GIC
bonds to tooth by Ca ion exchange and hydrogen bonding with collagen in dentine
no chemical bond to restoration
what is RMGIC
GIC with the addition of HEMA
shorter setting time and longer working time
cannot be used to cement ;porcelain restorations as HEMA swells and will cause porcelain to crack
what must composite luting cements be used with
suitable DBA
what does porcelain require when it is being cemented
silane coupling agent on the surface of porcelain rest
what do metal restorations require
metal bonding agent as well as having the fitting surface sandblasted
what is an example of a self adhesive composite resin
panavia
what are the two types of temporary cements
zinc oxide
zinc oxide eugenol
when can zinc oxide eugenol not be used as a temporary cement
when the definitive luting cement is resin based as left over eugenol can interfere with the setting
