Ormocers Flashcards
Bisphenol A has what properties?
oestrogenic affect
BISGMA is cytotoxic when?
in a number of cell cultures
what is an ormocer?
monomer free matrix of 3D cross linked polymers in which inorganic silanated filler particles =
- abundance of polymerisation opportunities
- as a consequence no residual monomer
who invented ormocers?
Fraunhofer insitute for silica research, Wurzburg
3 components of ormocers?
silicones
organic polymers
ceramic glasses
relative proportions of structural elements of ormocers define what?
the materials properties
for desired application manufacturer chooses?
base materials
how the inorganic poly condensation reaction is conducted
the linking reactions which lead to the construction of the organic network
what do the silicones give?
elasticity
surface permeability
gas permeability
what do the organic polymers give?
toughness/flexibilty
functionalisation
processability
ceramics/glasses give?
hardness
transparency
thermal/chemical stability
what is the first process of manufacturing?
build up of inorganic network
controlled hydrolysis and condensation of organically modified Si alkoxides
second process of manufacturing?
form of organic network
application of heat/UV initiate reaction of polymerisation of polymerisable units
= results in organic inorganic copolymer
can further customise properites by addition of?
particles
fibres
weaves - of all varying compositions
ormocors used in dentistry?
ormocer based composite restoratives - admira
light cured glass polyalkenoates
for composite - use dedicated product bonding agent
ormocers dental composite claims to?
have less shrinkage on setting
less residual monomers
