Department of Biomaterials and Bioengineering, Institute of Health Biosciences, The University of Tokushima Graduate School, 3-18-15 Kuramotocho, Tokushima 770-8504, Japan.
Dent Mater J. 2013;32(3):502-7. doi: 10.4012/dmj.2012-280.
A numerical simulation model, which was based on the setting and heating reactions of the binder phase of phosphate-bonded investment compacts, was developed to compute the porosities of set and burnout compacts. Densities and concentrations of microsilica particles in dilute suspension were measured and input into the simulation model. Validity of the model was confirmed by experimental results, that is, colloidal silica suspensions were prepared using different silica concentrations and mixed with investment powders. Porosities of these set and burnout compacts were experimentally measured. Effects of these factors on the porosity of compacts were examined using the developed simulation model: liquid/powder (L/P) ratio, concentration of microsilica particles in colloidal silica suspension, and ratio of binder component (NH₄H₂PO₄) in investment powder. It was concluded that numerical simulation is a viable tool for dental materials research.
开发了一种数值模拟模型，该模型基于磷酸盐结合型投资压坯的粘结相的设置和加热反应，用于计算凝固和烧失压坯的孔隙率。测量了稀悬浮液中硅微粉颗粒的密度和浓度，并将其输入到模拟模型中。通过实验结果验证了模型的有效性，即使用不同的二氧化硅浓度制备胶体二氧化硅悬浮液，并将其与投资粉末混合。使用开发的模拟模型实验测量了这些凝固和烧失压坯的孔隙率。使用该开发的模拟模型检查了这些因素对压坯孔隙率的影响：液/粉（L/P）比、胶体二氧化硅悬浮液中硅微粉颗粒的浓度以及投资粉末中粘结剂成分（NH₄H₂PO₄）的比例。结论是数值模拟是牙科材料研究的一种可行工具。
