Method of forming elastic layer on rigid plastic basis when manufacturing removable double-layer denture

FIELD: orthopedic stomatology.

SUBSTANCE: method of forming elastic silicone substrate on rigid plastic basis consists in that mechanically and chemically treated surface of rigid basis adjusting to prosthetic bed is moistened with monomer being a member of basis plastic composition, dried, and coated with adhesive primer. After 1 min pause, basis is introduced for 3-4 min into microwave field emitted by source with power 450-600 W. After microwave treatment, surface is coated by cold-cured elastomer and substrate layer is then formed in mouth cavity. Adhesive strength of layer is thus increased by more than 1.5-2 times when compared to conventional method.

EFFECT: increased strength of bond between soft substrate and rigid plastic basis, and prolonged service time of denture.

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The invention relates to prosthetic dentistry, methods for producing a removable two-layer dental prostheses, in particular to the formation of the elastic layer (lining) on the hard plastic base using the energy of the radiation of the microwave range.

A known method of manufacturing a two-layer dentures in the complete loss of teeth (U.S. Pat. RF 2008845, 1994, IPC 5 And 61 With 13/00), which includes operations:

1) tacking with the contact surface of the basis for the planting box of the mouth,

2) machining the surface of the base

3) drawing on its corrugated surface of the adhesive layer of thermoplastic organic materials, including natural origin (wax, bitumen, latex, etc.),

4) coating of plastic composition of the film material is polyethylene,

5) repeated tacking the contact surface through the film,

6) the connection of the film material with hard plastic base,

7) removal of excess plastic and film materials,

8) drying of the prosthesis.

As follows from the description of the method, the process of forming the hard basis of the elastic layer is coated with a film of polyethylene, including 8 of the required operations is simple and, in our opinion, the reliability when using the prosthesis. The connecting seam between the PL is ncoi and plastic base under the action of friction when you chew food easily wears out. In addition, the polymer film is exposed to aging, especially when a sudden change in temperature in the oral cavity, which negatively affects their durability.

Recent works related to the production of two-and in fact, three-layer prosthesis, should be called the invention Ickburgh with co-workers, protected by the RF patent 2132661, 1999, IPC 6 And 61 With 13/06. The main objective of the proposed invention is to increase the bond strength between the soft pads with a hard base and ensure long-term functioning of the prosthesis. From this point of view, this invention can be considered as the closest analogue, for the intended purpose, our technical solutions outlined on page 3 of the application description.

Being the characterizing portion of patent - analogue is the following. With the plaster model made contrastin with a gap, which is formed by applying on a plaster model of a multilayer clasp wax. The thickness of the wax layer should be equal to the total thickness of the metal plate layer (50-400 μm), which is napalan plasma method on the surface of contrastano, and elastic lining applied to this retention layer. With clearance form the configuration of the pads, which then polimerizuet. After that, a metal layer with an elastic lining NDA is up with contrastano and on the reverse side of the metal layer model hard polymetylmetacrylate (PMMA) based prosthesis (basis) of the two plates clasp wax, taking into account all amendments to the thickness of sprayed metal layer and the soft elastic.

A simple list of characteristics distinctive parts shows that technologically method is very complex and requires significant time to implement, for example, stages of polymerization of acrylic and silicone masses of hot curing following the conventional method of heat treatment in cuvettes (water bath) with subsequent cleaning and washing of the elastic layer, a prisoner in plasmolen armature. The method requires special equipment - installation "PLAST".

In the study of patent documents and scientific literature, the authors of the present proposal has taken into account the promising method of polymerization of thermoplastic masses for the manufacture of rigid base dentures under the action of microwave radiation. Work in this area is conducted over 10 years in several countries, including Russia (see U.S. Pat. U.S. No. 5104591, 1992, U.S. Pat. Of the Russian Federation No. 2157139 and 2157140, 2000, IPC 7 And 61 With 13/00, application for U.S. Pat. Japan No. 07-117316, 1995 and No. 10-129694, 1998, both the IPC And 61 13/15). These inventions have undeniable advantages over methods of making getcobascna prostheses compared with the long-used (traditional) by heat treatment, monomer-polymer of acrylate mixtures in a water bath. However, all the above-mentioned invention relates to improvements in manufacturing techniques ill the fir basis plastics under various conditions and modes of exposure to microwave radiation.

As for the impact energy of microwave radiation on the connection elastic lining materials, hot and cold curing with rigid PMMA plastic, the published article of the Turkish authors Akesi Ilbay S. And Ilbay S.G., J.Marmara University Dental Faculty, 1993, Sep., 327-32. The work is devoted to the study of the adhesion forces of the substrate of PMMA with vulcanizates hot (Mollopast-B) and cold (Getz Soft Oryl) curing in the presence of a coupling agent. In both cases, with retention sublayer and without it. Comparative experiments with traditional heating samples in cuvettes in a water bath and using the technique of microwave radiation. The results of tests on samples of two different groups showed that the adhesion strength of the hard and soft layers for both types of elastic materials magnitude is much higher than the traditional method of heating than the microwave.

In all likelihood, Turkish researchers have not installed dependencies between the parameters of the source of microwave radiation, the processing time of the materials in a microwave field and the chemical nature of all substances. Our research, both preliminary and final, allowed us to obtain results for the opposite conclusion, which we used when developing technical solutions.

In the course of the research the AMI was selected radiation source installed capacity, found the exact time of exposure to microwave radiation of the microwave range to the hard base coated with a two sublayers. The first is a monomer, which is part of PMMA plastic, the second adhesive (primer)containing methacrylate and silicone connection, ensuring the formation of strong chemical bonds between the substrates, rigid base polymer and elastic silicone lining derived from a vulcanizate of cold hardening.

Before placing the base in a microwave field its hard surface is treated first mechanically to give her roughness and increase the real contact surface substances, and then chemically to remove adsorbates that prevent strong adhesion of the layers. The above-described steps of forming the elastic layer on hard is very important for increasing the adhesion strength of connection pads with a basis in the second stage of this process.

Thus posed to the authors, the problem was solved through the development of a method of forming an elastic layer (lining) on the plastic base in the manufacture of removable double-layer denture. The method consists in the fact that the inner adjacent to the prosthetic socket, the surface of the basis metal handle cutter, degrease the swelling monomer, forming part of the base plastics. Then dried the surface, put on her adhesive (primer) and after a minute excerpts put the base in the microwave the microwave range for 3-4 minutes at the power of the radiation source 450-600 watts. After that, prepared as described above, the surface of the base cover polymer composition (elastomer) cold hardening, followed by forming the elastic layer of the prosthesis in the mouth.

The proposed method can be illustrated by the following examples.

Example 1. For forming the elastic layer on the inner surface of the rigid PMMA basis removable denture in the upper jaw was used silicone elastomer cold hardening Ufi Gel-P company VOCO with the attached primer (adhesive)containing organosilicon compound and an acrylate. The hard base of the prosthesis was made by thermopolymerization plastic Ftoraks, plastered in a cell.

The inner surface of the base adjacent to the prosthetic socket, metal handle cutter to give it a roughness, degrease it 96%alcohol and moisten with methyl methacrylate, which is allowed to dry. Then, on the surface, apply primer and after a minute excerpts basis with applied sublayers for 3 minutes and placed on a rotating table microwave field mikrovolnovoj the radiation power of 600 watts. After turning off the furnace basis take out and cover the inner surface of the elastomer, followed by forming an elastic layer on a rigid basis in the oral cavity. After curing, the excess elastic layer removed from the surface of the prosthesis.

As indicated by the observations, due to the increase of the adhesion strength of the hard and soft layers of the prosthesis, made our way, the duration of its use (without repair) increased more than 2 times. The comparison is conducted in terms of the use of dual-layer denture made previously for a particular patient of the same materials, but known in the art standard methods (Majodina, abstract of PhD thesis "Clinical and experimental justification for the use bastochnoi bastochnoi cold hardening plastics "Pentasil-R for forming double-layer bases laminar prostheses", M, 1999, p.13).

The life of the prosthesis at the moment exceeded six months.

Example 2. The patient with complete loss of teeth were made of two-layer prostheses with the use of our method of forming an elastic layer on a rigid basis of a thermoplastic material, Ethacryl-02. Maintain all the operations of example 1 except for reducing the power of the microwave oven to 450 W and increasing to 4 minutes processing time microfono the first radiation of hard surfaces of the bases covered sublayers.

The time of wearing dentures is about 5 months.

On the note of the patient, he does not feel any discomfort when chewing and speech articulation, dentures tightly adjacent to the mucous membranes of the oral cavity. No visible changes between layers is not found.

Example 3. All operations of forming the elastic layer on a rigid base made of plastic Stomatal performed as described in the previous examples except for the capacity of the furnace, installed at the level of 500 W, and the time of processing the surface of a base coated with a sublayer in the microwave the microwave range, equal to 3.5 minutes.

Observation: the time of wearing removable dual-layer denture on the lower jaw is longer than 4 months. When inspecting any changes and defects on the prosthesis is not detected. The patient does not experience any significant discomfort.

To prove the strength of adhesion of the hard plastic layer and soft silicone for a long time to keep its elasticity, were the samples were tested for adhesive strength by the method of "shift" according to GOST 14-759-69 on universal testing machine INSTRON-1251" IMM them. Baykova. Samples of basic plastics three types Packed in the cell and polymerizable in a water bath or in the microwave field. The surface of the acrylic plate was pre-cleaned, oasiria and, were treated with primer and inflicted on them a silicone elastomer, then glue the "overlap" to obtain the contact area 600 mm2that withstood the samples under load, then on the air from 40 to 60 minutes.

Comparative test results of adhesive strength of samples made close to our method and the traditional method, are summarized in table.

Table

The adhesion strength of the adhesion Ufi Gel-P with acrylic plastics
Basic materialApplying methodAdhesion (MPa)
Ethacryl-02Traditional (instructions)1,01
The proposed method2,47
The ftoraksTraditional (instructions)1,48
The proposed method3,24
StomatalTraditional (instructions)1,77
The proposed method2,97

We have developed a method, used in the manufacture and repair of removable double-layer dentures, has the following advantages:

1. Improves adhesion of the flexible and rigid layers of the prosthesis is not less than 1.5-2 times compared with the rate when forming the elastic lining on the hard basis of the traditional method.

2. Increases the service life of the prosthesis is at least two times, thanks

3. This reduces the number of clinic visits by the patient to replace the lining in case of leakage between layers.

The method of forming an elastic layer on a rigid plastic base in the manufacture of removable double-layer denture, including physical and chemical processing of internal, adjacent to the prosthetic socket, the surface of the base, wherein the surface is treated with a metal cutter, clean and moisten the monomer, which is part of the basic plastic, then dried surface, put primer on it and after a minute excerpts put the base in the microwave the microwave range for 3-4 min at a radiation power of the microwave oven 450-600 watts, then prepared as described above, the surface of the base cover polymer composition of cold hardening with subsequent formation of elastic layer of the prosthesis in the mouth.



 

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FIELD: orthopedic stomatology.

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1 tbl, 3 ex

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