SU1447371A1 - Composition for modelling dentures - Google Patents

Abstract

In order to increase adhesion and plasticity, the composition contains, in wt%: paraffin 13.4-17.3; synthetic rubber 4,2-4,4; polyethylene 2,8-3,1; alkylphenolamine resin 1 -1.5; the dye is 0.005-0.05 and ceresin is the rest. The composition is prepared by mixing the components with heat.

Description

four

00

This invention relates to medicine, in particular to orthopedic dentistry, to the formation of a wax reproduction of a dental prosthesis on a refractory model.

The aim of the invention is to increase the adhesion and plasticity of the composition.

The composition for modeling dental prostheses contains the components in the following ratio, wt%:

Paraffin13.4-17.3

Synthetic rubber4,2-4,4

Polyethylene2,8-3,1

Alkylphenolamine resin 1.0-1.5 Dye0.005-0.06

Ceresin Else

The composition includes as a base ceresin with a dropping point of 70-75 ° C and paraffin with a tal of 54-56 ° C; of fillers are stereoregular synthetic rubber with a content of 94–97% pl of 1.4 cs units, high molecular weight polyethylene with a melting point of 08–110 ° C, an alkylphenolamine resin with a melting point of 90–105 ° C, and a fat soluble dye.

In the specified amount, the dye does not affect the properties of the composition and only determines the color intensity.

The polymer products are dissolved in paraffin and ceresin, forming molecular solutions in the melt. Polyethylene changes the crystal structure of polymers, and

In a melting apparatus with mechanical displacement, preparing waxes of ceresin and paraffin, molten crushed rubber polyethylene, withstanding 160 ° C: stirred to form the original mass, then reduced to PO-125 ° C and added amine resin, periodically to completely melted, enter and mix everything thoroughly

The finished composition is poured into 25 forms, after hardening it is removed and packed in boxes or

To assess the technological chemical properties of the model according to the invention, three different compositions (m

rubber contributes to the formation of amorphous minimal and optimal).

phases.

The mixing of these components leads to the fact that rubber and polyethylene lose their elastic properties and enhance the plastic properties of paraffin and ceresin, as well as compact their crystal structure.

Experimental studies have shown that an increase in the polyethylene content above 3.1% dramatically increases the melt viscosity and the drop temperature, and a decrease below 2.8% worsens the workability of the wax and does not compensate for the loosening effect of rubber.

The application of the proposed plasticity and adhesive adhesive to temperatures below 30 ° C allows wax constructions on models without preliminary tide with molten wax, which is influenced by internal formative constructions, increases the lief of the wax reproduction and ultimately improves the quality of lit

40

Claims (1)

Formula invented Composition for modeling of wax, containing paraffin, ceramolamine resin, dye, so that, in order to increase the plasticity of the composition, it adds synthetic rubber in the following ratio of nanos, wt.%: The rubber content in the range of 4.2–4.4% provides the necessary amount of plasticity (in particular flexibility) and adhesiveness. A decrease in its content leads to a decrease in positive properties and the mechanical strength caused by the introduction of polyethylene increases dramatically. An increase in the rubber content leads to a deterioration in the processability of wax, an increase in adhesiveness and a decrease in the homogeneity of the composition. Alkylphenolamine resin is introduced in the range of 1.0-1.5%, which provides the necessary sedimentation stability and does not l causes excessive adhesion to the gear-technical tool and the hands of the technician. The introduction of polyethylene 2,8- 3,1% and rubber 4,2-4,4% in the composition leads to the fact that at T 20-30 ° C the value of 5 plastic deformation exceeds 5%, which provides the flexibility of wax blanks with low temperatures, and an increase in the dropping temperature to 88-90 ° C indicates that at higher temperatures of 40-50 ° C, being in a plastic state, the composition does not flow. A denture modeling compound is prepared as follows. Ceresin and paraffin are loaded into a melting apparatus of any design with mechanical movement to prepare wax compositions, melted, then crushed rubber and granulated polyethylene are added, kept at 140-160 ° C: stirred until a uniform mass is formed, then the temperature is reduced to PO-125 ° C and an alkylphenol-amine resin was added, periodically stirring until completely melted, the dye was added and the whole was mixed well. The finished composition is poured into molds 5, after solidification is removed from the molds and packaged in boxes or convalue. To assess the technological and physicochemical properties of the modeling composition according to the invention, three different compositions were prepared (maximum). five  minimal and optimal). minimal and optimal). The application of the proposed composition due to plasticity and adhesiveness at temperatures below 30 ° C allows one to simulate wax structures on refractory models without preheating and melt wax. This eliminates the effect of internal stresses in wax structures, improves the clarity of the wax pattern, and ultimately improves the quality of the casting. Invention Formula A denture simulation composition containing paraffin, ceresin, alkylphenolamine resin, a dye, characterized in that, in order to increase the adhesion and plasticity of the composition, it additionally contains synthetic rubber and polyethylene in the following proportions of taken components, wt.%: Paraffin13.4-17.3 Synthetic rubber 4,2-4,4. Polyethylene2,8-3,1 Alkylphenolamine resin 1.0-1.5 Dye0.005-0.06 Ceresin Else Paraffin 13.5 17.3 13.4 Synthetic rubber