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Silica-yttria stabilized zirconia (YSZ) nano-hybrid fillers were successfully prepared by spray pyrolysis process. The chemical and physical properties of silica-YSZ nano-hybrid fillers were characterized by powder X-ray diffraction (XRD), a field-emission scanning electron microscope (FE-SEM), and a transmission electron microscopy (TEM) using energy dispersive X-ray spectrometer (EDS). XRD revealed that the crystal phases of silica-YSZ nano-hybrid fillers were the phases of both amorphous silica and tetragonal YSZ. silica-YSZ nano-hybrid fillers exhibited spherical mor- phology with approximately 1 μm. The flexural strengths of the dental composites as the property of filler were examined. The difference in the primary particle size of silica-YSZ nano-hybrid fillers was related to the difference in the flexural strengths. The silica-YSZ nano-hybrid fillers formed by the primary particles with approximately 90 nm exhibited high flexural strength of the dental composites. The flexural strength of the dental composites using that silica-YSZ nano-hybrid fillers formed by the primary particles with approximately 90 nm was approximately 210 MPa.

Preparation of Spherical Silica Based-Fillers with Zirconia for Dental Composite by Spray Pyrolysis