Department of Conservative Dentistry and Prosthodontics, Faculty of Dentistry, Srinakharinwirot University, Bangkok, Thailand.
Dent Mater J. 2010 Aug;29(4):454-60. doi: 10.4012/dmj.2009-126. Epub 2010 Jul 16.
The purpose of this study was to evaluate the dynamic viscoelastic properties of experimental silicone soft lining materials, Silastic MDX 4-4210 reinforced with silica fillers. Storage modulus (E'), loss modulus (E") and damping factor (tan delta) were determined using a dynamic mechanical analyzer under a deformation strain level of 0.27% at test frequency and a temperature range of 1 Hz and 0 to 60 degrees C, respectively. The degree of silica dispersion was also studied using a field emission scanning electron microscopy (FE-SEM). One-way ANOVA and Tukey's HSD test results indicated that the prepared silicone elastomers provided a significantly greater damping factor, but less storage modulus than GC Reline Soft and Tokuyama Sofreliner Tough (p<0.001). The storage moduli, loss moduli and damping factor of the experimental silicone elastomers increased with increasing amounts of fumed silica. In conclusion, the experimental silicone elastomers revealed acceptable dynamic viscoelastic properties to be used as denture soft lining materials.
本研究旨在评估 Silastic MDX 4-4210 硅橡胶增强型填充剂的动态黏弹性性能。使用动态机械分析仪，在 0.27%的变形应变水平、测试频率为 1Hz 以及 0 至 60°C 的温度范围内，分别测定储能模量（E'）、损耗模量（E"）和损耗因子（tanδ）。采用场发射扫描电子显微镜（FE-SEM）研究二氧化硅的分散程度。单因素方差分析和 Tukey 氏 HSD 检验结果表明，与 GC Reline Soft 和 Tokuyama Sofreliner Tough 相比，所制备的硅橡胶弹性体的损耗因子明显更大，储能模量更小（p<0.001）。硅橡胶弹性体的储能模量、损耗模量和损耗因子随气相法白炭黑用量的增加而增加。总之，实验硅橡胶弹性体具有可接受的动态黏弹性，可作为义齿软衬材料。
