本研究將表面含有環氧基團之改質二氧化矽膠體顆粒—ES及GS，分別與壓克力樹脂—bis-GMA/TEGDMA (G/T)、光敏感劑CQ (camphorquinone)、光起始劑OPIA ((4-octylphenyl)pheny- liodonium hexafluro antimonate)進行混合製成牙科綴補材料；其在固化燈(λmax：420nm)的照射下，G/T與GS(或ES)同時分別進行自由基與陽離子光聚合反應形成一互穿網(interpenetrating network, IPN)結構之壓克力/二氧化矽混成材料。以精密儀器如FT-IR、TEM、DMA、TGA等分析IPN結構混成材料之光硬化轉化率、微細結構、動態機械與熱性質，並進而評估IPN結構對材料硬化收縮、抗壓縮強度及硬度之影響。實驗結果發現，IPN結構之壓克力/二氧化矽混成材料能大幅降低硬化收縮率，提升玻璃轉移溫度(Tg)及抗壓縮強度。

The acrylate/silica mixtures used in the dental restoration were obtained by mixing the oxirane groups containing colloidal silica, GS and ES, respective with bis-GMA/TEGDMA (G/T) acrylate resin, camphorquinone, a photo- sensitizer, (4-octylphenyl phenyliodonium hexafluroantimonate), a photoinitiator. GS(and ES) and G/T underwent cationic and free radical polymerization simultaneously to afford the acrylate/silica hybrids of interpenetrating network (IPN) structures when the mixtures were photo-cured at 420nm. The conversion of the reaction, morphology, dynamic mechanical and thermal properties of the IPN-structured hybrids were measured and investigated by the FTIR, TEM, DMA and TGA. The degree of curing shrinkage, compression strength and hardness of the hybrid were assessed subsequently. The experimental results suggested that the degree of curing shrinkage of IPN-structured acrylate/silica hybrid was lowered significantly, and the glass transition temperature (Tg) and the compression strength for the hybrid were increased obviously as well.

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