RU2248197C1 - Self-polymerizing composition for producing individual imprint spoons - Google Patents

Abstract

FIELD: medical engineering.

SUBSTANCE: composition is prepared from a powder and liquid, the powder containing acryl copolymer, chemically precipitated chalk and pigment, and the liquid containing methyl methacrylate with triethyleneglycol, dimethylacrylate and hydroquinone added in powder to liquid proportion of 2:1. The ingredients are taken in known quantities. The material polymerizes in given time.

EFFECT: high quality of orthopedic articles of low cost.

Description

The invention relates to medicine and can be used in orthopedic dentistry for the manufacture of individual spoons, mounting bases and bases of positioners.

In modern orthopedic dentistry at the clinical stages, auxiliary devices are widely used, individually made of cold-cured plastics, usually of foreign manufacture.

To obtain a precision impression at the stage of micro-prosthetics, impression spoons — fragmentary spoons-mouthguards — made individually from cold-cured polymers, are used.

One of the urgent tasks of orthopedic dentistry is the optimal restoration of the lost functions of the dentofacial system, including removable plate prostheses with complete loss of teeth. It should be noted that in the Russian Federation the number of patients of retirement age with complete loss of teeth is more than 25%. In connection with the aforementioned improvement of domestic methods and means of orthopedic treatment of such patients is an important task.

One of the factors ensuring the effectiveness of orthopedic treatment of patients with complete loss of teeth with removable dentures is a working impression, the quality of which depends to a large extent on the material used (composition, composition).

Various materials are now known and widely used for making individual spoons.

Spofa Dental (Czech Republic) produces two-component methacrylic injection plastic with a mineral filler content, which hardens on the basis of chemical initiation in the absence of heating.

The company “Hereus Kulzer”, Germany, for the manufacture of individual spoons developed materials such as plastic “Palavit-L”, “Palatrae-LC” “Paladisk-LC”, ready-to-use light-cured plates, they use a light polymerisation device for plastics.

Acrylic plastics Trey special (Kondulor firm), Formatray (Kerr firm, USA), Individual (Voko firm, Germany), Ostroy (GC firm, Japan), etc. are also used to make individual spoons.

Unfortunately, none of the companies for obvious reasons does not disclose the composition of its material to a quantitative and qualitative level, and all of the materials mentioned are quite expensive.

Due to the fact that in the scientific and patent literature the applicant has not found a self-polymerizing material for the manufacture of individual spoons, A.S. has been selected as the closest analogue. USSR No. 360082, class A 61 C 9/00.

The material consists of powder and liquid, and in order to increase heat resistance, improve technological properties, increase the strength of the copolymer material, a suspension grafted copolymer of methyl methacrylate with fluororubber is used as a powder in a ratio of components from 1: 7 to 1:10.

Obviously, the material is good for the mentioned purposes, however, it is quite tough, laborious to manufacture, difficult to process, expensive.

The technical problem to be solved is the development of a self-polymerizing composition with optimal working time for the manufacture of products in orthopedic dentistry and high physical and chemical properties.

Moreover, the technical result obtained by the implementation of this invention is to improve the quality of manufactured orthopedic products for dentistry and reduce their cost.

The technical result mentioned is achieved in that the self-polymerizing composition consists of a powder comprising a suspension copolymer of methacrylic acid methyl and butyl esters, chalk, chemically precipitated pigment, and a liquid including methacrylic acid methyl ester, triethylene glycol dimethacrylate, hydroquinone in a powder to liquid ratio of 2: 1 in the following ratio of components, wt.%:

Suspension copolymer of methyl and

methacrylic acid butyl esters 44.7-47.7

Chemically precipitated chalk 18.5-21.5

Pigment 0.065-0.085

Methacrylic acid methyl ester 29.2-33.2

Triethylene glycol dimethacrylate 1.5-2.5

Hydroquinone 0.004-0.006

The combination of the mentioned essential features in the stated ratio makes it possible to obtain a composition with optimal working time for the manufacture of products from it and high physicochemical properties.

Example. Self-cutting composition with the composition and ratio of components, wt.%:

Suspension copolymer of methyl and

butyl esters of methacrylic acid 45.5

Chemically precipitated chalk 21.5

Pigment 0,066

Methacrylic acid methyl ester 31.0

Triethylene glycol dimethacrylate 1.93

Hydroquinone 0.004

obtained as follows (for example, the preparation of a composition for the manufacture of an individual spoon).

In strict accordance with the recipe, the components are thoroughly mixed. Then the powder is mixed with the liquid in a ratio of 2: 1 at room temperature and normal humidity.

The amount of material depends on the size of the jaw of the patient. For example, to make a medium-sized spoon, take 10 g of powder and 5 g of liquid, then mix thoroughly until a homogeneous mass is formed, hold it until the test stage (6-7 minutes), lay it on a plaster model and form a spoon. The working time of the material (the time from the moment of mixing to the moment of inability to form the product) 10-12 minutes The polymerization of the material takes place on the desktop for 15-17 minutes. After polymerization of the material (the product has a solid texture and ambient temperature), the spoon is separated from the gypsum model and processed with milling cutters.

Material for the manufacture of mounting bases and bases-positioners are prepared in a similar way.

As for the individual components included in the composition, then:

- a suspension copolymer of methacrylic acid methyl and butyl esters is the main component of the reaction, from which the polymerization initiator exits into the liquid. Moreover, with an increase in the content, the wettability of the powder deteriorates, the plastic properties of the material deteriorate, and the polymerization processes are disturbed. With a decrease, the polymerization time increases and the physicochemical properties deteriorate;

- chalk is used to reduce the reaction temperature, reduce costs; with an increase in the content of the component, the physicochemical properties of the material deteriorate, with a decrease, the reaction temperature increases (at high temperatures the monomer boils and the product can be deformed) and the cost of the material;

- the pigment can be used in various colors to give an aesthetic perception to the material and the product from it;

- Methacrylic acid methyl ester serves to trigger a chemical reaction. With a decrease in the component content, the wettability of the powder deteriorates, the plastic properties of the material deteriorate, the polymerization processes are impaired, and with an increase in the polymerization time, the physicochemical properties deteriorate;

- triethylene glycol dimethacrylate increases the polymerization time and increases the hardness of the material, when it increases, the stiffness and brittleness of the product increases, and when it decreases, the effect of increasing working time is lost;

- hydroquinone is an inhibitor and is added to maintain fluid suitability for at least two years. An increase in its content leads to the absence of a reaction process when mixing the powder and liquid, and its decrease leads to the polymerization of the liquid without adding powder.

It should be noted that the material has a very convenient and important for practical purposes working time of 10-12 minutes, which allows the doctor to make several products without hurry, which means without loss of quality, for example, individual spoons for the upper and lower jaw.

Claims (1)

A self-polymerizing composition for individual impression spoons based on a powder — an acrylic copolymer and a liquid — methacrylic acid methyl ester, characterized in that the powder additionally contains chemically precipitated chalk, a pigment, and a suspension copolymer of methacrylic acid and methyl butyl esters is used as an acrylic copolymer, and the liquid additionally contains triethylene glycol, dimethacrylate and hydroquinone with a ratio of powder and liquid 2: 1 in the following ratio of components, ma from.%: Methyl Suspension Copolymer and methacrylic acid butyl esters 44.7-47.7 Chemically precipitated chalk 18.5-21.5 Pigment 0.065-0.085 Methacrylic acid methyl ester 29.2-33.2 Triethylene glycol dimethacrylate 1.5-2.5 Hydroquinone 0.004-0.006