lecture 6 Flashcards
role of cements
bind restorations to tooth structure
3 groups of cements
water based
resin based
oil based
water based cements
glass ionomers
resin modified glass ionomers
zinc phosphate
zinc polyacrylates
resin based cements
composite
compomers
oil based cements
zinc oxide eugenol
requirements for cements
low viscosity but good mechanical properties
25 micrometers thick
how to balance mechanical properties and viscosity
powder= filler
more filler, more viscosity.
low P:L gives you what
increased working and setting time
resin cements
one component system
needs to be reversible, orthodontic bonding, also used for ceramic crown, bridges, veneers, inlays, onlays
viscosity and strength of resin cements controlled by what
low molecular weight monomers
filler load
glass ionomer
acidic polymer and basic glass
cured by acid base reaction
releases flouride
good adhesion to tooth surface
advantages to glass ionomer
adheres to tooth structure
biocompatible
proven clinical record
fluoride released.
disadvantages to glass ionomer
slow setting
poor physical properties
optical properties
early dissolution
