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Composite resin a type of acrylic resin (Properties (Optical and…
Composite resin
a type of acrylic resin
Classification
due to matrix, polymerization type and kind of fillings
Microfilling
fraction of micro
=> anterior teeth
agglomerate
condensate
homogeneous
heterogeneous
Hybrids
microfilling + macrofilling + pre-polymeriza particles
( ↑ mechanical resistance)
microfilling + macrofilling
small + microfilling
microfilling + minifilling
heavy particle: for posterior teeth
Macrofilling
several microns
=> molars
miniparticales/ microparticles: anterior
hybrids/ blends: anterior
macroparticles: posterior teeth
Properties
Optical and aesthetic properties
colors, shades, translucent, opacities, fluorescence...
surface polishing: the smaller inorganic filling, the better polishing
Water sorption: small amount (organic)
compensate polymerization shrinkage
Thermal expansion coefficient: high,
need adhesion system
marginal filtration problems
↑ Radiopacity
Mechanical resistance
with microfilling: less resistance
high compressive resistance
Absence of adhesion to dental structure: need adhesive system
Wear resistance: many factors
Biocompatibility
Time evolution:
max response is the third day
5-8 become normal
inflammatory, small layer of reparative dentine (secondary dentine)
Germ presence: infection
Hardness > AR
Polymerization reaction
first to break double links (exothermic)
Activation system
chemical/ auto/ self- curing: less extent
light- curing: more extended
UV lamp
visible/ halogen light (425-450)
thermo-curing: lab use
setting grade
--> light curing thickness: 3mm
inhibit surface layer (un-polymerized, sticky)
--> use glycerin to avoid
polymerization shrinkage << AR shrinkage
--> light curing: to light direction
Indication
Artificial teeth: harder and more resistance than AR
Cover metal surface
--> for aesthetic demands
Sealant
BIS-GMA resins, without filler
Other with inorganic filler
--> more life, mechanical resistance
Compomer and Ionosite (CR & GI)
--> CR indicate in cervical area
Cement
advantage:
better optical
best compatibility for ceramic or composite resins
composition:
BIS-GMA
inorganic filler
microparticle
drawback of old cement:
opacity
less adhesion
solubility
hardening:
light-curing
self- curing
dual cement
Aesthetic plastic restoration
anterior
posterior
Rigid restoration
indirect procedure processed out of mouth
ceramic: mechanical resistance and aesthetic great
--> CR: cheaper, perform with patient, more accessible
Composition
Inorganic filling
--> to improve the properties
Interface matrix- filling: Bonding agents
to obtain appropriate coefficients of thermal expansion
radiopacity
suitable polished
commonly use
Al silicate & lithium
barium or strontium silica glass
Al silicate & barium
quartz
colloidal silica, pyrogenic silica
zirconium
Organic matrix
biphenyls A + 2GMA --> BIS-GMA (toxic)
Other
dyes
preservative
activator & inhibitor