METHOD FOR MANUFACTURING ARTIFICIAL DENTURES Russian patent published in 2000 - IPC

FIELD: medical engineering. SUBSTANCE: method involves modeling gingival prosthesis in usual way. Wax softening, plaster model drying and plastic polymerization is carried out in UHF-stove in dielectric cell. Gingival prosthesis boundary is traced on a model produced from gypsum using wax imprint. Gingival wax prosthesis structure is modeled. Gypsum application is made using direct modelling method with wax prosthesis structure in the dielectric cell having loss factor ε″=0.2-0.5 in its material. Time is given for gypsum to harden. The gypsum having been hardened, the gingival wax prosthesis structure is softened in the UHF-stove at 500-700 W of UHF power during 1-2 min. The cell is opened. The soft wax is removed. The rest of wax is washed out with boiling water. The gypsum form is dried in the UHF-stove at 250-350 W of UHF power during 5-10 min. The gypsum form is coated with insulation lack layer and the material to be used is prepared according to technical guide depending on its type. The material under use is taken in the amount equal to the gypsum form volume. Molding out and pressurizing is carried with 4600-5400 kg of force. Then the parts of the same cell are fixed with bolts and the cell is placed into the UHF-stove on the peripheral area of the board. The board together with the cell is rotated about the vertical axis. The prosthesis is polymerized in the UHF-stove under the following conditions. The prosthesis is heated in the UHF-stove during 6-10 UHF power min with UHF power of 110-130 W. The UHF power is reduced to 0-60 W and the condition is hold for 3-5 min. The UHF power is increased once more to 200-250 W and the condition is hold for 6-10 min. Then the cell is taken out from the stove and cooled in the open air at room temperature during 45-75 min. The cell is opened and the gingival prosthesis is withdrawn. EFFECT: accelerated manufacturing process; high accuracy of modeling; retained gingiva color. 3 dwg