INVESTIGADORES
PEREZ Claudio Javier
congresos y reuniones científicas
Título:
PREPOLYMERIZED ORGANIC-INORGANIC HYBRID NANOPARTICLES AS FILLERS FOR LIGHT-CURED METHACRYLATE MONOMERS.
Autor/es:
V. MUCCI; G. ARENAS; C.J. PEREZ; C.VALLO
Lugar:
Praga
Reunión:
Conferencia; 7th International Conference on Nanostructured polymers and nanocomposites; 2012
Resumen:
Light-cured
dental materials consist of free-radical polymerizable methacrylate monomers
filled with a mixture of different inorganic fillers1. The
polymerization of the methacrylate monomers is initiated by radical-forming
photoinitiators, which decompose under irradiation with visible light in the
region of 450-480 nm (blue light) 2. The inorganic fillers are
incorporated to reduce the polymerization shrinkage3; which
contributes to the development of contraction stresses that often lead to bond
failure and recurrent caries4.
According to a
recent review by Ferracane 5, the most important changes in
resin-based dental composites have involved the reinforcing filler, which has
been purposely reduced in size to produce materials that are more easily and
effectively polished. Due to the small particle size, i.e. large specific
surface area, the interaction between the matrix and the surface of the particles
is dramatically increased6. This raises the viscosity of the filled
resins and reduces the attainable filler load. Thus, it is important to devise
methodologies to introduce high amounts of inorganic fillers into resin
composites. In this context, the preparation of silica nanoparticles in organic
liquid media is especially interesting.
The present study was carried out in order to
explore the possibility of incorporating high amounts of inorganic filler into
an organic monomer by the sol-gel process