A method of making a removable dental prostheses with elastic lining

 

The invention relates to medicine, namely prosthetic dentistry. A method of making a removable dental prostheses containing a rigid base and a flexible lining, includes the formation of elastic lining by making a wax model denture impression of the mouth, forming a wax model in a special cuvette using a molding material, wax removal, formation of Gating passages and a fill composition for the formation of elastic lining containing oligoalkylation, with a content of NCO-groups of 5.6-6.8 per cent, oligopolistic alcohol and catalyst at a ratio of wt. h: oligoalkylation - 100, oligopolistic alcohol - 14,8-25,8, catalyst - 0,04-0,1, and maintaining the cell for the formation of the lining. After forming the elastic lining spend the formation of a hard base. The method allows us to simplify and reduce the cost of obtaining prostheses with improved physical-mechanical properties. table 1.

The invention relates to medicine, namely to prosthetic dentistry and can be used for the manufacture of dentures.

Prosthetic dentistry has increased and more and more gestkaia quality of the materials used.

Under unfavorable anatomical and topographical conditions of the prosthetic bed - severe atrophy of the alveolar ridge, the presence of sharp bone edges and exostosis, thinning malopodatliva mucosa, and increased pain sensitivity using prostheses with hard bases becomes difficult or completely impossible. In these cases shows the use of two-layer bases with elastic lining, facing directly to the tissue prosthetic bed.

A known method of making a removable dental prostheses with elastic lining, consisting in the fact that the composition based on silicone rubber prepared immediately before use and the mixture is applied on the hard acrylic base denture Curing of the lining occurs in the oral cavity of the patient.

(RF patent 2187296, MCI And 61 To 6/093, publ. 2002) the disadvantages of this method include low adhesion of the lining to the base denture (1.9 kg/cm). In addition, the presence of mixture components in the oral cavity of a patient can have an adverse effect on the mucous membrane.

Known closest to the claimed method of manufacturing a two-layer basis removable subneg what about the impression of the denture part of the oral cavity is made of two-layer wax model of the denture, then, using the molding material to produce molding wax model, then make removing the top layer of wax formation Gating passages and fill in the composition for forming a hard basis removable dental prosthesis on the basis of polyurethane, then remove the bottom layer of wax, forming holes in the resulting hard basis and produce a fill composition for the formation of elastic lining containing polyisocyanate with a content of NCO-groups 3,7-5,5%, oligopolistic alcohol and dibutyltindilaurate tin as a catalyst, maintain cell for forming a lining on the hard basis, then open the cell, remove the denture and conduct final processing of the prosthesis (U.S. Pat. USA 4024636, MCI And 61 With 13/00, publ. 1977).

In the known method as MDI use 4,4'-dicyclohexylmethane, isophorondiisocyanate, hexamethylenediisocyanate, 2,2,4-trimethyl-1,6-hexadienal, xylylenediisocyanate, "demeril' -diisocyanate, methylcyclohexylamine and the product of the interaction of 3 moles of hexamethylenediisocyanate with 1 mol of water, are not products of industrial production.

Used polyisocyanates require special preparation - degassing vacuum >Used in the known method the composition to obtain an elastic lining layer of removable denture is only for bases on the basis of polyurethane, because it does not have sufficient adhesion to the hard polymer layer, and a connection with a rigid base denture occurs due to the interaction of the isocyanate elastic layer with a urethane groups of the hard base with the formation of allophanate connection.

The invention solves the problem of simplifying the method of obtaining a two-layer bases removable dentures with elastic lining polyurethane with improved physical-mechanical properties, while the hard basis can be obtained from various polymeric materials.

The problem is solved due to the fact that in the method of making a removable dental prostheses containing a rigid base and a flexible lining, including the formation of elastic lining by making a wax model denture impression of the mouth, forming a wax model in a special cuvette using a molding material, wax removal, formation of Gating passages and a fill composition for the formation of elastic lining, containing polyisocyanates and removal of gates, to fill in the cuvette using a composition containing as MDI oligoalkylation with the contents of six groups of 5.6-6.8 per cent in the following ratio, wt.h.: Oligoalkylation - 100,0 Oligopolistic alcohol - 14,8-25,8 Catalyst - 0,04-0,1 and after the formation of the elastic lining spend the formation of a hard base.

As oligoethyleneoxysilfonate the composition may contain oligotetramethyleneglycol (TU-38.103-137-78), or a mixture of oligoethyleneoxysilfonate Trevor-based oligopolisation and oligopolisation.

As oligopolization alcohol composition may contain oligoamenorrhea with molecular weight of 500 (Laprol 503, THE-6-05-1679-83), oligoamenorrhea with molecular weight of 370 (Laprol 373, TU-6-05-221-831-85)) or oligoamenorrhea with molecular weight of 500 (Laprol 502, THE-6-05-18-54-78).

As the catalyst composition may contain dibutyltindilaurate or octoate tin. If you need a painted base composition may contain a colorant, such as pigment red 5S (TU 6-14-588-79) in an amount of 0.0001-0,00015 wt. o'clock, i.e. traces. Used polyisocyanates subjected to degassing under VA the MES with elastic lining polyurethane with improved physical and mechanical properties, with high adhesion to any polymer basis removable dental prostheses, in particular polyacrylates. This simplifies the process of obtaining a two-layer removable dentures, because the preliminary formation of the elastic lining allows the creation of a basis by the conventional methods, without any prior activities Using industrial-manufactured components helps to make the production of such prostheses mass.

The results of preliminary clinical trials of the material obtained on the basis of the proposed composition, meet regulatory requirements, determining the possibility of its application in prosthetic dentistry, namely as a lining for the basis of the combined dentures.

The invention is illustrated by examples.

Example 1.

The impression of the denture part of the oral cavity wax model design elastic lining on the plaster model, produce molding plaster model with wax design elastic lining in a special cell with the use of silicon molding material. After solidification of the mass open ditch, remove the wax from the plaster model, plaster Modein) - 18 wt.h. and acetone - 30 wt.h. After this plaster model is placed in the resulting form and collect the cell. In the resulting gap through the gates poured a composition for the formation of elastic lining, containing, by weight.h.: Oligotetramethyleneglycol with a content of NCO-groups=5,6% - 100 Oligodendroglial (M m=500) is 22.2 Dibutyltindilaurate tin - 0,04 maintain cell for forming a lining at room temperature for 5 hours.

After completion of the polymerization cell open, cut molding, remove the plaster model made it elastic lining, cut off the sprues.

Then proceed to the manufacturer of the hard basis of a two-layer prosthesis with artificial teeth. On the plaster model with the elastic lining made of wax design basis of the prosthesis, it is placed in a special cell, which is filled silicone molding composition. After solidification of the molding material into the cuvette open, remove the wax, set of artificial teeth according to their prints in the received form. With the help of special devices prepared Gating moves. The assembled cell fill composition for the 370 - 100,0
Dibutyltindilaurate tin - 0,12
The cuvette is placed in a thermostat for 2 hours at 80oC. After cooling the cell open, remove the denture with two-layer basis, remove the sprue and produce the final processing of the prosthesis.

Physico-mechanical properties of polyurethane elastic lining of the resulting prosthesis is shown in the table.

Example 2.

Manufacturer of removable denture with elastic lining is carried out in accordance with example 1, but for education lining using a composition of the following composition, wt.h.:
Oligotetramethyleneglycol with a content of NCO-groups=5,8% - 100,0
Oligoamenorrhea (M m=370) - 16,4
Dibutyltindilaurate tin - 0.04
The cell with the composition is incubated at 90oC for 1 hour.

To obtain a hard basis use composition comprising, by weight.h.:
4,4'-diphenylmethanediisocyanate - 100,0
Oligoamenorrhea, M m 500 - 80,0
1,4-butanediol - 14.4V
Dibutyltindilaurate tin - 0,1
The cell with the mixture incubated at room temperature for 10 hours. Then the cell open, remove the two-layer denture, remove the sprue and produce the final processing of the prosthesis.

Physico-mehanicheskaya denture carried out in accordance with example 1, but for smooth lining using a composition of the following composition, wt.h.:
Oligotetramethyleneglycol with NCO content=6,0% - 100,0
Oligoamenorrhea (M m=500) - 14,8
Dibutyltindilaurate tin - 0,06
and for forming a hard basis dual-layer denture use composition comprising, by weight.h.:
4,4'-diphenylmethanediisocyanate - 100
Oligoamenorrhea, M m 500 - 23,5
Oligoamenorrhea, M. M. 370 - 87,0
Dibutyltindilaurate tin - 0,15
Physico-mechanical properties of polyurethane elastic lining of the resulting prosthesis is shown in the table.

Example 4.

Fabrication of two-layer denture carried out in accordance with example 1, but for the formation of elastic lining use composition comprising, by weight.h.:
Trevor-(mix oligopolisation and oligopolisation in their mass ratio 51,5: 48,5 with the average content of NCO-groups=6,3%) - 100
Oligoamenorrhea (M m=370) - 19,0
Octoate tin - 0,1
as for making a hard basis use composition comprising, by weight.h.:
4,4'-diphenylmethanediisocyanate - 100,0
Oligoamenorrhea, M 500 m - 103
1,4-butanediol - 8,0
Octoate ol in the table.

Example 5.

Manufacture of elastic lining to obtain a two-layer denture carried out in accordance with example 2, but using a composition containing, by weight.h.:
Trevor-(mix oligopolisation and oligopolisation in their mass ratio 51,5: 48,5 with the average content of NCO-groups=6,5%) - 100,0
Oligoamenorrhea (M m=500) - 17,2
Octoate tin - 0,1
Then proceed to the manufacturer of the hard base denture. On the plaster model with the elastic lining made of wax design basis of the prosthesis, it is placed in a metal cell. Then the wax softens, heated 20 min and removed by boiling the water and get a hollow shape of the prosthesis. Plaster mould cover separating varnish "Izokol-69". The cell is dried in air for 12 hours, then fill composition to obtain a prosthetic base "Ftoraks", compress the mixture and conducting the polymerization in hot water: first maintained at a temperature of 70oC for 60 min, then for 30 min in boiling water.

Then the cell open, remove the two-layer denture and do the final processing of the prosthesis.

Physico-mechanical>Fabrication of two-layer denture carried out in accordance with example 5, but to obtain an elastic lining use composition comprising, by weight.h.:
Trevor-(mix oligopolisation and oligopolisation in their mass ratio 51,5: 48,5 with the average content of NCO-groups=6,5%) - 100,0
Oligoamenorrhea (M m=500) and 25.8
Dibutyltindilaurate tin - 0,1
Physico-mechanical properties of polyurethane elastic lining of the resulting prosthesis is shown in the table.


Claims

A method of making a removable dental prostheses containing a rigid base and a flexible lining, including the formation of elastic lining by making a wax model denture impression of the mouth, forming a wax model in a special cuvette using a molding material, wax removal, formation of Gating passages and a fill composition for the formation of elastic lining containing polyisocyanate, oligopolistic alcohol and catalyst, and maintaining the cell for forming a substrate, characterized in that to fill in the cuvette using a composition containing as the polyisocyanate is oligoalkylation 100,0

Oligopolistic alcohol 14,8-25,8

The catalyst 0,04-0,1

and after the formation of the elastic lining spend the formation of a hard base.

 

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SUBSTANCE: composition has polydimethylvinyl siloxane rubber, filler, silica hydride and platinum catalyst. 3-[(2-oxypropyl methacrylate)aminopropyl]-triethyl silicoformate and stain are optionally included. The ingredients are taken in known proportions. The prosthesis has acryl base and underlying layer under the base produced from the said composition. The composition allows producing underlying layers of high adhesion to prosthesis base.

EFFECT: improved service characteristics.

2 cl, 2 tbl

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