Silica microspheres,as an important kind of fillers,have great impact on mechanical and thermal properties of dental resin.In this article,silica microspheres were prepared by sol-gel method and applied in modification of dental resin.The appearance and size of SiO2 microspheres were characterized by Fourier trans-form infrared spectroscopy (FT-IR),scanning electron microscope (SEM),transmission electron microscope (TEM),dynamic light scattering (DLS).It showed that SiO2 particles were successfully modified by KH-570 and had global microspheres with homogenous size and distribution (average diameter 450nm).The mechanical and thermal performances of dental composite were tested by universal testing machine and dynamic thermo-mechanical analysis (DMA).It found that the roughness,glass transition temperature Tg and the storage mod-ulus E′increased with increasing of silica content,but the strength and compression strength first increased and then decreased.By optimizing the content of silica,the ratio of silica was approach 45wt%,the value of bending and compression strength reached maximum (123.682 and 208.802 MPa respectively).The effect of silica micro-spheres on the mechanical performance and thermostability was discussed and its possible reasons were ana-lyzed.%Si O 2微球是齿科树脂的重要填充物,为进一步研究其对齿科树脂性能的影响,采用溶胶-凝胶法制备纳米Si O 2微球,并将其改性后应用于齿科树脂中,通过 FT-IR、SEM、TEM、激光粒度分析仪、微机控制万能拉伸试验机、DMA 等对制备的 Si O 2及其齿科复合材料进行表征分析.结果表明,γ-甲基丙烯酰氧基丙基三甲氧基硅烷成功改性SiO2,得到的SiO2微球分散性较好,呈规则的球形,平均粒径为450 nm；复合材料的强度与填充量有关,随着 Si O 2含量的增多力学性能增大,当填充量为45％时,复合材料的力学性能最大,弯曲强度为123．682 MPa,压缩强度为208．802 MPa,E′和 tanδ均达到最大值,并分析了力学性能存在差异的原因.
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