title: Effects of colloidal silica suspension mixing on porosity of phosphate-bonded investments after setting and heating processes.
abstract: 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.
authors.affiliation: Department of Biomaterials and Bioengineering, Institute of Health Biosciences, The University of Tokushima Graduate School, 3-18-15 Kuramotocho, Tokushima 770-8504, Japan.
authors.forename: Ji-Young
authors.initials: JY
authors.lastname: Bae
authors.forename: Kenzo
authors.initials: K
authors.lastname: Asaoka
mesh_terms: D055598:Chemical Phenomena; D060326:Chemistry Techniques, Synthetic; D003102:Colloids / Q000737:chemistry; D003198:Computer Simulation; D003734:Dental Casting Investment / Q000737:chemistry*; D003799:Dental Stress Analysis; D006358:Hot Temperature; D008422:Materials Testing / Q000379:methods*; D008956:Models, Chemical; D009716:Numerical Analysis, Computer-Assisted; D010316:Particle Size; D010539:Permeability; D010710:Phosphates / Q000737:chemistry*; D016062:Porosity; D011208:Powders / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry*; D014867:Water
chemical_list: D003102:Colloids; D003734:Dental Casting Investment; D010710:Phosphates; D011208:Powders; D014867:Water; D012822:Silicon Dioxide