Effect of the functionalization of silica nanoparticles as a reinforcing agent on dental composite materials

Keywords: Composite material, functionalization, silica, UDMA, EGDMA, particle size, dental materials


The present study evaluated the effect of silica nanoparticle aggregation
state on the reflectance and crystallinity of dental composite materials. Two types of silica nanoparticles (ca. 10 nm): Aerosil 200 non funcionalized and Aerosil DT4 funcionalized with 3-methacryloxypropyltrimethoxysilane. Nanoparticles were dispersed in a monomer mix composed by Urethane Dimethacrylate (UDMA) and Ethylene glycol Dimethacrylate (EGDMA) in a 80:20 mass ratio. The particle size of silica and their aggregation state were determined using scanning electron microscopy (SEM) and transmission electron microscopy (TEM), showing that the Aerosil DT4 has dense aggregates with sizes higher than 1 µm; on the other hand the Aerosil
200 showed a particle gel-like structure. The functionalization degree of
the Aerosil DT4 was determined by thermogravimetric analysis (TGA),
obtaining a value of 7.57% w/w. The composite materials were evaluated by Differencial Scanning Calorimerty (DSC) to determine their crystallinity. The composite material reinforced by Aerosil DT4 showed lower cristallinity than the system with Aerosil 200 due to higher interaction of the polymeric matrix with the funcionalized surface of the Aerosil DT4. The effect of the aggregation state of silica nanoparticles on the optical properties of the composite material was determined by reflectance analysis. The Aerosil 200 sample showed a lower degree of nanoparticle aggregation and higher reflectance than the system with Aerosil DT4. The functionalization of  the Aerosil DT4 induced nanoparticle aggregation diminishing the optical properties of the composite material.

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Author Biographies

Henry Alberto Rodríguez-Quirós, NEW STETIC S.A.

Estudiante de Doctorado en Ciencias Químicas de la Universidad de Antioquia. Perteneciente al Grupo de Coloides de la Universidad de Antioquia.

Coordinador de Investigación y Gestión Tecnológica. Perteneciente al grupo de investigación GINEWS

Herley Fernando Casanova-Yepes, Universidad de Antioquia
Director del Grupo de Coloides de la Universidad de Antioquia


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