Abstract
Radiopaque composites have been produced from flame-made ytterbium/silica mixed oxide within a crosslinked methacrylate resin matrix. The refractive index of the filler powder increased with ytterbium oxide loading. A high transparency was achieved for a matching refractive index of the filler powder and the polymer in comparison to commercial materials with 52 wt% ceramic filling. It was demonstrated that powder homogeneity with regard to particle morphology and distribution of the individual metal atoms is essential to obtain a highly transparent composite. In contrast, segregation of crystalline single-oxide phases drastically decreased the composite transparency despite similar specific surface areas, refractive indices and overall composition. The superior physical strength, transparency and radiopacity compared to composites made from conventional silica based-fillers makes the flame-made mixed-oxide fillers especially attractive for dental restoration materials.
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Acknowledgment
The research was supported by the Kommission für Technologie und Innovation (KTI) TOP NANO 21, Grant No. 5929.1, Switzerland. We gratefully acknowledge the technical support on the refractive index measurements of H. Schulz and D. Stratakis (ETH Zurich). Stimulating discussions with Prof. S.E. Pratsinis, H. Schulz, R. Mueller, M.J. Height (ETH Zurich) are also gratefully acknowledged.
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Mädler, L., Krumeich, F., Burtscher, P. et al. Visibly transparent & radiopaque inorganic organic composites from flame-made mixed-oxide fillers. J Nanopart Res 8, 323–333 (2006). https://doi.org/10.1007/s11051-005-9007-z
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DOI: https://doi.org/10.1007/s11051-005-9007-z