Dental Polymers
Dental Polymers
Dental Polymers
PRESENTED BY,
SMIJAL
CONTENTS
Thermoplastic
Thermoset
Based on structural units.
Vinyl Resins
Polystyrene
Acrylic Resins
Epoxy “
Multifuctional acrylate resins
APPLICATIONS IN DENTISTRY
1) Linear
2) Branched
Based on Type of Poymerization.
Addition Polymerization
Condensation “
Random copolymerization
Graft type “
Block type “
Polymerization unit
ADDITION POLYMERIZATION
Ionic polymerization :
Catalyst bring about exchange of ions
resulting in cross- linked polymer.
Eg : Addition silicones
CONDENSATION POLYMERIZATION
[ Step- growth ]
Block Copolymerization
When specific number of monomer units are
repeated together in a particular pattern.
Graft copolymerization
Requirements of Polymerization
1) Momomer (reactive gp) with functional gp C=C.
2)Side gp on polymer determines the physical
properties of resulting polymer.
Side group is usually pendent group.
STAGES OF POLYMERIZATION
1) Initiation
2) Propagation
3) Termination
4) Chain transfer
1) Initiation
Inhibitedby impurities.
These react with activated free- radical or
any activated nucleus or with an activated
growing chain to prevent further growth.
Eg: Hydroquinone
Presence of O2
PHYSICAL PROPERTIES OF
POLYMERS.
Higher
the temperature, softer & weaker the
polymer .
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