Effect of Adding Spherical Silica Filler on Mechanical Properties and Anti-carious Activity of Glass-ionomer Cement

研究了球形二氧化硅填料对玻璃离子聚合物水泥（GIC）力学性能和抗龋活性的影响。原始GIC和含有20wt%球形二氧化硅填料的制剂也检查了它们的断裂表面和氟化物释放。硅化球形填料（SF）的抗压强度可显著提高17%。SF将抗弯强度提高了17%。SF的加入改善了GIC的可加工性和力学性能。与对照组（原始GIC）比较。SF的加入显著改善了齿腔的即时边缘间隙和Teflon模具的凝固收缩率，分别达到63%和66%。然而，氟化物释放明显减少。然后，本研究表明，添加5wt% SF可提高人牙釉质和牙本质的剪切结合强度。

This study was investigated the effects of spherical silica fillers on the mechanical properties and anti-carious activity of glass-ionomer cements (GIC). The original GIC and a preparation containing 20wt% spherical silica filler were also examined with regard to their fracture surface and fluoride release. The fillers increased the compressive strength remarkably : up to 17% in the case of silanized spherical fillers (SF). The SF increased the flexural strength by up to 17%. The addition of SF improved the workability and mechanical properties of GIC. When compared with the control (original GIC). The addition of SF significantly improved immediate marginal gap in the tooth cavities and setting shrinkage in Teflon mold up to 63% and 66% respectively. However, fluoride release was significantly reduced. And then, this research showed that addition of 5wt% SF increased the shear bond strength to human enamel and dentin.