Denture

 

(57) Abstract:

The invention relates to medicine and can be used in prosthetic dentistry. The technical result is the prevention of erosion of the material of the dental prosthesis and secretions in the mouth of the elements and compounds that cause allergic and toxic reactions. Denture contains plastic base, fitted with artificial teeth. The outer surface of the base made in the form of porous wear condensed in the vacuum of the atomic flux of constituent elements of a film made of bioinert dielectric forming galvanic couples with structural materials, chemically inert towards them and the environment of the oral cavity substances such as oxide of tantalum.

The invention relates to medicine, namely to prosthodontics.

One of the main problems in prosthetic dentistry is the search for ways of eliminating patients severe allergic and toxic reactions resulting from exposure to substances included in the composition of the acrylic plastic, which are used for dentures. The composition of the monomer, which is used for receiving the sludge acids. In addition, the composition of the basal plastics are various plasticizers, cloud emulsions, dyes and catalysts. Even under ideal adherence polymerization full-linking monomer is achieved. The violation of polymerization leads to a sharp increase in the number of residual, unbound monomer. Due to erosion of the plastic under the action of various reasons (diffusion extraction components, chemical and mechanical effects) of the above substances act in the oral cavity, causing the clinical manifestations of allergic and toxic reactions. To reduce the impact of plastics components on the human body, along with the improvement of structural materials in dentistry searching various types of protective coatings that prevent erosion of the surface of the prosthesis, in particular work on the modification of the surface of the prosthesis.

Famous dentures with elevated denetleyicisi properties, representing plastic base are installed on the teeth [1] , as well as methods of making dentures with protective coatings[2] , [3] , [4] and [5] .

In the author's evidence [1] to eliminate allergic react is adding the original mixture of powder metal alloy, used for prosthodontic works, volume 19 to 20%.

The main disadvantages of the proposed solution are:

- increase the conductivity of the modified layer and the growth of electrochemical currents in the mouth;

- changes in the mechanical properties of the prosthesis, because it is converted to a design type sandwich structure, which are plastic inner is not modified part, "covered" durable metalized shell.

The proposed solution does not exclude the contact of the tissues of the oral cavity by polymethyl methacrylate, methyl methacrylate, erosion which leads to the development of allergic and toxic reactions.

In the author's evidence [2] is proposed to solve the problem of biological indifference prostheses by modification of their surface by chemical means. This is used for processing of the finished products of different solvents for 3-10 min, for example, acetic acid esters. The main disadvantage of this modification is a short-term effect, because the solvents produce simple chemical cleaning of the surface of the prosthesis by leaching of residual unreacted monomer and polymerization initiators. Allergic and toxic reactions remain valid.

Excluding contact of mucous prosthetic bed with prosthetic material can fully be realized by using more or less thick, impermeable products for erosion plastic, metal layers or other materials.

A known design of prostheses [3] , in which the insulating strips are applied thin layers of adhesive, Mylar film, plated or pasted gold foil. However, when using such strips are substantially complicated by the operation of the prosthesis, in addition, the use of "massive" pads changes the shape of the prosthesis and the violation of his fixation. The logical way out of this situation is the application of film coatings of small thickness having high adhesion to the material of the prosthesis. However, the first experiments by plating on plastic prostheses showed that in this way arise the principal obstacles to achieving high adhesion and a uniform coating thickness of not more than 1 μm, not violating the shape accuracy and the fixation of the prosthesis. The closest analogue, taken as a prototype, is the construction of the dental prosthesis, the method of metallization which is described in authorswarning in the form of galvanic metal coating of palladium with a thickness of 5-7 microns or silver with a thickness of 20-30 μm, moreover, to increase the adhesion of the coating on the plastic used pre-processing of dentures in solutions of surface-active substances.

A common shortcoming of this and other similar structures prostheses containing metallized plastic, is the following. All singleton metals used in dentistry as a coating (gold, platinum, palladium, silver), and conductive alloys and solid solutions, are not biocompatible with the human body. In particular, palladium toxic to living tissues. In addition, the introduction of metal conductors in the oral cavity leads to galvanic couples and, as a consequence, the electric currents flowing under the action of electrochemical differences of potentials, which, in turn, stimulates chemical-toxic, allergic and electrogalvanic reaction. It is also important that getting a solid, porous, postavkoy metal films with a thickness of 1-2 microns, having a high adhesion to the material of the prosthesis, electrochemical methods is of fundamental limitations associated with the mechanism of their growth, and thicker films may reduce the accuracy of the shape of the prosthesis and complicate their fixation.

The purpose of the compounds, cause allergic and toxic reactions.

This objective is achieved in that the surface of the dental prosthesis is made in the form of a porous, wear-resistant, condensed in the vacuum of the atomic flux of constituent elements of a film made from a biologically inert, dielectric, forming a galvanic couples with structural dental materials, chemically inert towards them and the environment of the oral cavity substances such as oxide of tantalum.

After fabrication of the dental prosthesis by known methods and polishing the denture is covered with a film of tantalum oxide thickness of 0.6-0.8 μm in the vacuum processing chamber installation of reactive ion-plasma magnetron sputtering of tantalum.

An additional feature of the proposed design of the dental prosthesis is maintaining its high-quality polished surface, as well as in connection with the use of vacuum methods of depositing films of tantalum oxide, there is no need to create a rough surface to increase adhesion of the film to the substrate for subsequent plating (palladium, gold, silver), as proposed, for example, in the author's svidetelyam holding intraoral apipucos allergological tests (using a plastic disk with a diameter of 2 cm), the membranes of the oral cavity and the condition of the capillaries, which assessed the condition of the mucosa before and after the study, established the intolerance of the material of the prosthesis. Next were sampled using the same disks, but having on its surface a film of an oxide of tantalum. Since the result was negative, it is possible to apply the coating to a previously-made denture. During the subsequent operation of the prosthesis patients reported disappearance of the phenomena of burning, dryness, swelling of the mucous membranes of the mouth and lips, improvement of General condition. Objectively observed the disappearance of inflammatory phenomena, microscopic examination normalization of the microcirculatory bed. Cases erosion of the materials of the prosthesis and allocation in the mouth of the elements and compounds that cause allergic and toxic reactions were observed.

Sources

1. SU 219099, 30.05.1968.

2. SU 470297, 15.05.1975.

3. Pathological physiology. /Ed. by A. I. Volozhin, G. C. paradine. M : Medpress, 1998, 480 S.

4. SU 254008, 07.10.1969.

5. SU 1680142, 30.09.1991.

Denture containing plastic base, fitted with artificial teeth, ulvaceae of the atomic flux of constituent elements of the film, made of bioinert dielectric forming galvanic couples with structural materials, chemically inert towards them and the environment of the oral cavity substances such as oxide of tantalum.

 

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