| 摘要 |
PROBLEM TO BE SOLVED: To provide a mold with physical and mechanical properties similar to a natural tooth, by producing a ceramic network structure from ceramic suspension and injecting glass into a part thereof. SOLUTION: Polyvinyl alcohol with concentration of about 0.5-2wt.% is added to deionized water in a pH range of 2-6, a precipitant is added to an alumina suspension with homogeneous dispersion promoted ceramic particles to remove excess water and a dispersant (20). The alumina suspension (colloid) is injected into a gypsum mold and dried to draw out water into the gypsum (21B, 22B). The dried suspension is taken out from the gypsum mold and burnt in a furnace under a temperature range 1000-1400 deg.C (24). Low melting point glass is injected into a crown part of burnt suspension and heated at about 1100 deg.C for about 0.5-1 hour (25A). Further, monomer solution is injected into the suspension part in the crown part (26). After that, excess glass is removed from the surface of the suspension. |
