Silicone composition for forming a lining layer basis removable dentures

 

(57) Abstract:

The invention relates to prosthetic dentistry. Silicone composition for forming a lining layer basis removable dentures contains silicone rubber, metal oxides, pigment, catalyst, glass microspheres, a polydimethylsiloxane, a surfactant, glycerine or polyoxymethylenes, the components are taken in certain proportions. The composition has a high adhesion, moisture resistance, strength properties, which ensures a long time use in the oral cavity.

The invention relates to silicone compositions used in prosthetic dentistry, in particular, for the formation of the elastic lining layer in the manufacture of dentures.

Known composition based on silicone rubber, containing in wt.% polydimethylsiloxane rubber 62,7-78,45, chelate compounds of aluminum and titanium 2-7,84, diethylaminoethylmethacrylate 3-4,35, a mixture of modified Aerosil with zinc oxide 16,549-25,1, pigments 0,01-0,02 (and.with. The USSR 427706, 1975, MKI A 61 C 9/00).

In the Federal Republic of Germany patent 4328248, 1995, MCI A 61 C 13/01 mentioned elastic material based on silikonovye lining material to the base is achieved by external pressure. The composition of the material (composition using silicone rubber) is not specified.

Protected in the first invention, the composition is adopted by us for the prototype allows to obtain the elastic lining material, which, however, has a limited period of use in the oral cavity due to insufficient water resistance and adhesion. In the second invention, the formation of the elastic lining material is complicated: it requires special equipment.

The task of the invention is to provide a composition for forming lining with high strength and adhesion to prosthetic base.

As a result of scientific-experimental studies we have developed a silicone cold cured composition containing the ingredients in the following amounts, wt.%:

Silicone rubber (M m 40000-60000) - 46,57 - 48,65

The aluminum hydroxide was 4.76 - 4,86

Alumina - 0,946 - at 1,047

The silicon oxide - 8,64 - 8,9

The modified silica - 3,742 - 4,545

Surfactant (glycerol, polyoxyethylenesorbitan) - 5,68 - 6,88

Glass microspheres - 5,12 - 5,47

The polydimethylsiloxane - of 14.46 - 14,49

Dibutyltin tin - 1,57 - 1,83

Gamma aminopropyltriethoxysilane - 1,4 -1,49

Eilsel>The composition proposed for the formation of the elastic lining layer on the basis of dentures, it has high adhesion, moisture resistance, optimum strength properties, which ensures a long time use in the oral cavity.

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 an underlayment for the basis of the combined plate dentures. Material longstanding high performance adhesive strength after soaking in water for 32 days adhesive strength is maintained at the level of 1.9 kg/cm, a water absorption of from 0.1 to 0.3%, the adhesive strength under shear - 11,9 kg/cm2.

Tests conducted by the Department of faculty of prosthetic dentistry the University for compliance with ISO 10139-1; 10993; 7405.

The preparation of the composition described in the following examples.

Example 1

In a mechanical mortar making silicone rubber (M m 40000) in an amount of 65 m H., aluminum hydroxide - 6,5 m H., silicon oxide is 11.9 m H., modificirovannaya within half an hour and the mixture is discharged into the tank. Then prepare a mixture of the following components: oligomerisation - 77,3 m H., alumina - 5,65 m H.-modified silica - 11,35 m H., microspheres - 5,63 m H. that mix there within half an hour, and the mixture is discharged from the stupa. Then to 20 m H. prepared mixture is added a catalyst consisting of 1,05 m h dibutyltindilaurate tin, 2,1 m H. ethyl silicate, 0,94 m H. gamma aminopropyltriethoxysilane and 0.9 m CH VINYLTRIMETHOXYSILANE.

The resulting composition is administered in mixture I in the amount of 80 m H., mix until a homogeneous mass within 2-3 minutes.

The composition is prepared for forming the lining of silicone material on the hard acrylic base denture. Curing of the lining occurs in the oral cavity of the patient.

Properties composition: specific tensile strength =12.0 kg/cm2, elongation L=120%, the curing time of the composition in the oral cavity of the patient 34 minutes

Example 2

In a mechanical mortar is stirred for half an hour silicone rubber (M m 60000) in an amount of 65 m H., silicon oxide is 11.9 m H., polyoxyethylenesorbitan (SAS) - 7,6 m H.-modified silica - 2,18 m H. , aluminum hydroxide - 6,5 m H., glass, Mick is capacity. Then prepare a mixture II comprising oligomerisation - 77,8 m H., a modified silicon oxide - 13,65 m H., alumina - 5,11 m H., glass microspheres - 5,4 m H. Components is stirred for half an hour and unloaded from the stupa. To 20 g of this mixture II add dibutyltindilaurate tin - 1,05 m H., gamma-aminopropyltriethoxysilane - 0,94 m H., ethyl silicate - 2,1 m H., propyltrimethoxysilane - 0,9 m H. the resulting homogeneous composition is added to 80 g of a mixture of I. the Composition is stirred for 2 to 3 minutes to obtain a homogeneous mass. The product is ready for use as a lining material for the hard base of the dental prosthesis.

Properties composition: =12.5 kg/cm2L=130%, the curing time in the oral cavity 45 minutes.

Example 3

The mixture of components produced in a mechanical mortar that make silicone rubber (M m 40000) in an amount of 62.5 m H., silicon oxide and 11.6 m H. , polyoxyethylenesorbitan (SAS) - 9,2 m H.-modified silica - 6,1 m H., aluminum hydroxide is 6.4 m H., glass microspheres - 7,35 m H., iron trioxide - 0.2 m h Components is stirred for 40 minutes, the mixture I unload.

There is prepared a mixture II comprising oligomerisation - 77,8 m H., modified the s 35 minutes and the mixture II unload. To 20 m H. this mixture add dibutyltindilaurate tin - 1,05 m H., ethyl silicate - 2,1 m H., gamma-aminopropyltriethoxysilane - 0,94 m H., VINYLTRIMETHOXYSILANE - 0,9 m H. the resulting mixture is stirred with 80 m h mixture I for 2 - 3 minutes until a homogeneous mass.

The composition is ready for use as a lining material for hard acrylic base denture. Curing of the composition occurs in the mouth for 3 to 4 minutes

Properties composition: =13.5 kg/cm2L=130%, the curing time in the mouth - 34 minutes

Example 4

The mixture of components produced in the course of half an hour in a mechanical mortar that make silicone rubber (M m 60000) in an amount of 62.5 m H., silicon oxide and 11.6 m H.-modified silica - 6,1 m H., aluminum hydroxide is 6.4 m H., glass microspheres - 7,35 m H. trioxide iron of 0.4 m H. the mixture I is stirred for 30 minutes and discharged into the tank. There is prepared a mixture II comprising oligomerisation - 77,3 m H., a modified silicon oxide - 11,35 m H., alumina - 5,65 m H., glass microspheres - 5,63 m H. Components is stirred for half an hour and discharged into the tank.

Then to 20 m H. this mixture II add dibutyltin is 0,9 m including the resulting composition is mixed with 80 m h mixture I in 2-3 minutes until smooth.

The composition is ready for use as a lining material. Curing of the composition occurs in the mouth for 3-4 minutes

Properties composition: =12.0 kg/cm2L=135%, the curing time in the mouth 3-4 minutes

Silicone composition for forming the elastic lining layer basis removable dentures, including polyacrylate - polydimethylsiloxane rubber, metal oxide - modified silicon oxide, pigment, catalyst, characterized in that it further comprises a polydimethylsiloxane, glass microspheres, surfactant-glycerine or polyoxymethylenes, as the metal oxide further comprises silicon oxide, aluminum oxide and aluminum hydroxide, and a catalyst for use dibutyltindilaurate tin, ethyl silicate, gamma aminopropyltriethoxysilane and alkenylsilanes at the following content, wt.%:

Polydimethylsiloxane rubber - 46,57-48,65

The polydimethylsiloxane - of 14.46-14,49

The modified silica - 3,7-4,545

The silicon oxide - 8,64-8,9

Alumina - 0,94-at 1,047
Pigment - 0,082-0,34

Dibutyltindilaurate tin - 1,57-1,83

Ethyl silicate - 2,89-3,14

Gamma aminopropyltriethoxysilane - 1,4-1,49

Alkenylsilanes - 1,16-1,35 t

 

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