The method of obtaining an acrylic basis microwave polymerization

 

(57) Abstract:

The invention relates to medicine, namely prosthetic dentistry. The method of obtaining an acrylic basis microwave polymerization is swelling powder suspension polyacrylate in water containing methyl methacrylate and acrylic oligomers, followed microwave polymerization of the obtained molding material, at the same time as acrylic oligomers in the liquid, a mixture of ethoxylated dimethylacrylate of diphenylolpropane, 1,6-dimethacrylate of hexandiol, N-ethyl-N-phenyl-amino-2-hydroxypropylmethacrylate, and the mixture additionally contains polymethylsiloxane fluid, and swelling of the molding material is carried out in the microwave field for 7 to 12 minutes at power microwave fields 10 - 20% subsequent microwave polymerization of the base material in one cycle for 3 min at a power of the microwave field 100%. The method provides increased durability and functional usefulness of removable dentures. table 1.

The invention relates to medicine, namely to prosthodontics.

Known methods for producing acrylic bases microwave polymerization for producing kotorye, which is used dimethacrylate ether of triethylene glycol (TGM-3) or bis- (methacryloxyethyl) - diethylene glycol (ACM-2).

A method of obtaining acrylic bases microwave polymerization includes the following: for gypsumings models of the prosthesis in the cuvette recommended to withstand the proportion of gypsum: water 2,3:1,0 to avoid uneven heating in the microwave field. Swelling of the acrylic base material before molding is conducted in air at room conditions, the swelling time is very dependent on room temperature and can vary from 15 to 25 minutes Mode microwave polymerization includes 3 stages: I heating at 20% power microwave for 8 min, II - pause 4 min, III - heating at 40% power microwave for 8 minutes [Novikova O. B. Clinical and experimental substantiation of the possibility of using microwave radiation for polymerization of plastics in dentistry. Abstract. Diss. Kida. the honey. Sciences), 1997 - 24 C.].

However, obtained in this way removable plate dentures with acrylic basis microwave polymerization have several disadvantages that impair their functional properties and processability in manufacturing. Swollen acrylic base material to which sistency test that adversely affects the processability of the base material and the accuracy of the dental prosthesis. Known acrylic base materials microwave polymerization is very sensitive to heat in the microwave field, to eliminate porosity and achieve the optimum properties required basis multistage and continuous microwave polymerization, the complication of the process gypsumings models of the prosthesis to strict proportions of gypsum:water.

The purpose of this invention is to improve durability and functional usefulness of removable dentures with acrylic basis microwave polymerization by increasing the manufacturability acrylic base material microwave polymerization by increasing the fluidity of the molding material acrylic material and eliminating the heterogeneity of the properties of basis of the result of uneven heating in the microwave field.

This objective is achieved in that in a method of producing an acrylic basis microwave polymerization by swelling powder suspension polyacrylate in water containing methyl methacrylate and acrylic oligomers, followed microwave polymerization of the obtained molding MB ethoxylated dimethacrylate diphenylolpropane, 1,6-dimethacrylate of hexandiol, N-ethyl-N-phenyl-amino-2-hydroxypropylmethacrylate and the mixture additionally contains polymethylsiloxane fluid, and swelling of the molding material is carried out in the microwave field within 7-12 minutes at power microwave fields 10-20%, followed microwave polymerization of the base material in one cycle for 3 minutes at power microwave field 100%. It is desirable to use a mass ratio of powder and liquid is equal to 2-2,5:1-1,5.

Example. Removable laminar denture with acrylic basis microwave polymerization is made as follows. Gypsum model with wax prosthesis in a cell for microwave ovens from a radiotransparent material commonly accepted in the dental practice the method, after the hardening of the plaster cuvette is placed in a microwave oven for 1 minute at 100% power to melt the wax, then the cell open, remove any traces of wax and draw the base of the prosthesis surface plaster moulds are covered with insulating varnish. Then prepare the molding composition of the basic material, which in a suitable container with lid made of radiotransparent material (PE Cup, glass jar, etc. ) pour liquid consisting of 1 g of N-ethyl-N-phenyl-amino-2-hydroxypropylmethacrylamide liquid PMS-100 and 68 g of methyl methacrylate. In the liquid poured suspension powder of polymethyl methacrylate at a mass ratio of powder and liquid 2:1. Both halves of the cell in the expanded form is placed on the table in microwave ovens, on one half of the cell set a closed lid container of prepared molding composition of the base material for swelling in the microwave. The swelling time of 10 min at a power of 10%. At the end of time swelling the finished dough is extracted from the tank and produce a package of well-known way. Both halves of the cell is fixed in the closed position by the screws and again placed on the table in microwave ovens. Mode microwave polymerization consists of one cycle of 3 min at 100% power. After polymerization, the cell is removed from the oven, allow it to cool in air for at least 30 minutes, uncover and remove the finished prosthesis, which is then subjected to grinding and polishing according to the standard technique.

Test samples of the base material of the microwave polymerization obtained by the claimed method, showed an increase in the fluidity of the molding material (consistency index) acrylic material and eliminating the heterogeneity of the properties of basis of the result of uneven heating in the microwave field (see table).tsionnogo polyacrylate in the liquid, containing methyl methacrylate and acrylic oligomers, followed microwave polymerization of the obtained molding material, characterized in that as acrylic oligomers in the liquid, a mixture of ethoxylated dimethacrylate diphenylolpropane, 1,6-dimethacrylate of hexandiol, N-ethyl-N-phenyl-amino-2-hydroxypropylmethacrylate and the mixture additionally contains polymethylsiloxane fluid, and swelling of the molding material is carried out in the microwave field within 7-12 minutes at power microwave fields 10%-20% with the subsequent microwave polymerization of the base material in one cycle for 3 min at power microwave fields 100%.

2. The method according to p. 1, characterized in that the mass ratio of powder and liquid is 2-2,5 : 1-1,5.

 

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