Abstract
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.
Highlights
IntroductionFlexural strength, compressive strength, and wear resistance of the resin composites are low for using with canines and posterior teeth(1–3)
The resin composites have been widely used as dental filling materials1)
SiO2-Y2O3 stabilized ZrO2 (YSZ) spherical particles were successfully prepared by spray pyrolysis process
Summary
Flexural strength, compressive strength, and wear resistance of the resin composites are low for using with canines and posterior teeth(1–3). The flexural strength of front teeth is approximately 100 MPa. On the other hand, the flexural strengths of canines and posterior teeth range from approximately 200 to 500 MPa. SiO2 based-particles with Al2O3, ZrO2, TiO2, and CaO either alone or in combination have been usually used as fillers). The flexural strengths of dental composites with SiO2 based-fillers with Al2O3 are lower than 120 MPa. It is known that the using of ZrO2 to SiO2 basedfillers is effective for improvement of mechanical properties of the dental composites(4–6). The flexural strength and compressive strength of ZrO2 ceramics with tetragonal and cubic structure are higher performance than that of ZrO2 ceramics with monoclinic structure. Tetragonal and cubic phases can be stabilized upon doping with trivalent ions such as Y3+(7, 8)
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