Week 1 - intro to composite restorations Flashcards
types of aesthetic restorative material (tooth colored)
ceramic inlays/onlays silicate cement acrylic resin conventional glass ionomers composite
ceramic inlays/onlays
fabricated in lab
can be done chairside with CAD/CAM
silicate cement
no longer used
used to use for anterior restorations
acrylic resin
use in areas where temperature change, abrasion, and stress are LIMITED because-
low strength, high polymerization shrinkage
conventional glass ionomers
release fluoride for anti-cariogenicity
used for root surface caries
DO NOT use in occlusal areas
why are CGI bad for use in occlusal areas?
low resistance to wear and low strength
two types of glass ionomers
resin-modified
compomer
resin modified GI
resin added to GI to increase physical properties
can be light cured
acid-base setting rxn
compomer GI
polyacid modified composite
composite with some GI components
Composite components
resin + inorganic filler for increased physical properties
what kind of bonding agent used for composites?
silane bonding agent
types of composites
macrofill microfill hybrid composites nanofill composites packable composites flowable composite
most popular type of composite used today
nanofill composite
nanofill composite
small filler particles
highly polishable
packed tight for physical properties
packable composites
most viscous
for proximal contact restorations
mimic amalgam
flowable composite
low filler content
poor physical properties
class I restorations
bad for high stress areas
hybrid composites
high physical properties of macrofill and smoothness of microfill
macrofill (conventional)
80% inorganic filler
large particle size
good phys properties but rough texture
not used
microfill
35-60% filler
small particles
smooth surface texture, less phys properties
important properties of composite
linear coefficient of thermal expansion water sorption wear resistance surface texture radiopacity modulus of elasticity solubility
why must composites be radiopaque?
to detect radiolucent recurrent decay
done by adding Ba++ fillers
what is wear resistance?
resisting abrasive contact
not as good as amalgam
water sorption
amount of water material absorbs over time
absorption decreases phys properties
higher filler = less absorption
dimensional change that occurs w/ change in temperature
linear coefficient of thermal expansion
