METHOD FOR MAKING REMOVABLE DENTURE Russian patent published in 2010 - IPC A61C13/08 

FIELD: medicine.

SUBSTANCE: invention refers to medicine, namely to orthopaedic dentistry, and can be used in making a removable denture with a rigid plate, including with using an elastic seat. The method involves moulding of a denture part of the oral cavity, structural wax modelling of a prospective denture on a dental cast, dental casting with using a wax model in a moulding tray with using a duplicating silicone as a moulding paste, curing of the moulding paste, opening of the tray after the duplicating mass is cured, elimination of the wax from the dental cast and formation of runners, drying and degreasing of the denture to be placed by moulds, drying of the dental cast and isolation of the dental cast with polyurethane varnish and dividing lubricant, placing of the denture by the cast moulds and assembling of the moulding tray, heating of the dental cast and the silicone mould with the denture, filling the tray through the runners with the components of polyurethane mixture based of diisocyanate and polyatomic alcohol to mould the rigid seat, heating and curing of the moulding tray with the filled polyurethane mixture, extraction of the denture with the rigid seat from the polyurethane mixture after cooling and opening of the moulding tray, removal of the runners and finishing of the end denture. In making the removable denture, the end dental cast is dried up in a microwave at power 300-700 watt within 10-15 minutes, the dental cast is covered with layers of the isolating polyurethane varnish with each layer dried at room temperature within 5 minutes, and final drying of the whole varnish coat in the microwave at power 70-100 watt within 5-10 minutes. The dental cast and the silicone mould with the denture are heated in the microwave at power 90-100 watt within 20-25 minutes. Filling of the moulding tray of the initial components of the polyurethane mixture is preceded with preheating of a vertically positioned two-module cartridge with the initial components in a thermal case at temperature 60-70°C within 40-60 minutes. The cartridge is cooled to room temperature for 30-60 minutes; the assembled moulding tray is put in a polymerisation reactor; a two-module cartridge with the initial components of the polyurethane mixture is inserted into a dispenser and, after discharge of the outlets of the two-module cartridge, a mixer is put on the cartridge, and a capacity of the moulding tray is filled with a thin stream of the polyurethane mixture to be discharged from counter-runners, and the filled moulding tray immediately placed in the polymerisation reactor is air-pressurised in a sealed polymerisation reactor at pressure 2 atm within 5 minutes without water filling of the internal capacity of the polymerisation reactor. Before disassembling, the filled tray is cured in the microwave at power 70-100 watt within 10-15 minutes, and in making the wax moulds, the runners of diametre 4-8 mm are used.

EFFECT: ensured process of the high-quality removable denture with sufficient modulus of transverse and longitudinal elasticity of the rigid seat, with sufficient Charpy impact, with ensuring the preset level of solidity of the rigid seat, prolonged operation life and simplified technological process.

5 cl, 3 ex