Polyvinylsiloxane impression material
First Claim
1. A polymerizable polyorganosiloxane composition, including a catalyst for polymerization, said composition for making a dental impression, comprising:
- (a) a QM resin, containing vinyl groups;
(b) a linear vinyl terminated polydimethyl-siloxane fluid, forming with said QM resin a dispersion having a vinyl content of about 0.16 to 0.24 m-mole/g;
(c) an organohydrogen polysiloxane for cross-linking said vinyl groups;
(d) an organoplatinum catalyst complex for accelerating polymerization of said components;
(e) an emulsifying plasticizer for said catalyst complex;
(f) a retarder component in sufficient amount for temporarily delaying the onset of said polymerization;
(g) a filler; and
(h) a surfactant that imparts wettability to said composition, wherein said composition surface contact angle with water is less than 50°
after three minutes wherein the OM resin-containing dispersion comprises;
a first dispersion having a viscosity of about 5,000-7,000 cps; and
a second dispersion having a viscosity of about 45,000-60,000 cps, said OM resin comprising about 20-25 weight % of said dispersions.
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Abstract
Improved two component polymerizable polyorganosiloxane compositions are described, particularly for use in making dental impressions, having improved tear strength and wettability. Improved tear strength results from inclusion of a quadri-functional polysiloxane having a vinyl content of 0.16 to 0.24 m-mole/g. Working time is maintained by including sufficient amounts of a retarder composition that delays onset of the vinyl polymerization. Wettability is improved by including a surfactant resulting in a surface contact angle with water at three minutes of less than 50°. The surfactant chosen has an HLB of 8-11, such that the wetting contact angle is achieved within less than two minutes and remains wetting throughout the working time of the impression taking, substantially improving the impression making process.
208 Citations
26 Claims
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1. A polymerizable polyorganosiloxane composition, including a catalyst for polymerization, said composition for making a dental impression, comprising:
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(a) a QM resin, containing vinyl groups; (b) a linear vinyl terminated polydimethyl-siloxane fluid, forming with said QM resin a dispersion having a vinyl content of about 0.16 to 0.24 m-mole/g; (c) an organohydrogen polysiloxane for cross-linking said vinyl groups; (d) an organoplatinum catalyst complex for accelerating polymerization of said components; (e) an emulsifying plasticizer for said catalyst complex; (f) a retarder component in sufficient amount for temporarily delaying the onset of said polymerization; (g) a filler; and (h) a surfactant that imparts wettability to said composition, wherein said composition surface contact angle with water is less than 50°
after three minutes wherein the OM resin-containing dispersion comprises;
a first dispersion having a viscosity of about 5,000-7,000 cps; and
a second dispersion having a viscosity of about 45,000-60,000 cps, said OM resin comprising about 20-25 weight % of said dispersions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method to taking a dental impression, in a wet environment, of oral hard and soft tissues, comprising:
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mixing a polymerizable polyorganosiloxane composition, including a polymerization catalyst comprising, (a) a QM resin, containing vinyl groups, (b) a linear vinyl terminated polydimethyl-siloxane fluid, forming with said QM resin a dispersion having a viscosity of about 5000-60,000 cps and a vinyl content of about 0.16 to 0.24 m-mole/g, (c) an organohydrogen polysiloxane having a viscosity of about 35-45 cps for cross-linking said vinyl groups, (d) an organoplatinum catalyst complex for accelerating polymerization of said components, (e) an emulsifying plasticizer for said catalyst complex component, (f) a retarder component in sufficient amount for temporarily delaying the onset of said polymerization, (g) a filler, and (h) a surfactant that imparts wettability to said composition, wherein said composition surface contact angle with water is less than 50°
after three minutes;placing said mixture into contact with said tissues; allowing said mixture to harden into said impression; and removing said impression from said tissues; wherein the OM resin-containing dispersion, comprises a first dispersion having a viscosity of about 5,000-7,00Q cps; and
a second dispersion having a viscosity of about 45,000-60,000 cps, said OM resin comprising about 20-25 weight % of said dispersions. - View Dependent Claims (18, 19, 20)
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21. A method of making a two component polymerizable polyorganosiloxane composition, one component including a polymerization catalyst, comprising:
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(a) forming a first component, including, (i) a QM resin containing vinyl groups, dispersed in a linear vinyl terminated polydimethylsiloxane fluid, said dispersion having a viscosity of about 5,000-60,000 cps and a vinyl content of about 0.16 to 0.24 m-mole/g, (ii) an organohydrogen polysiloxane having a viscosity of about 35-45 cps for cross-linking said vinyl groups, (iii) a filler, and (iv) a surfactant that imparts wettability to said composition, wherein said composition surface contact angle with water is less than 50°
after three minutes and wherein said OM resin-containing dispersion, comprises a first dispersion having a viscosity of about 5,000-7,000 cps; and
a second dispersion having a viscosity of about 45,000-60,000 cps, said OM resin comprising about 20-25 weight % of said dispersions;(b) mixing a second component, comprising, (i) a QM resin containing vinyl groups, dispersed in a linear vinyl terminated polydimethylsiloxane fluid, said dispersion having a viscosity of about 5000-60,000 cps and a vinyl content of about 0.16 to 0.24 m-mole/g, (ii) a filler, (iii) an organoplatinum catalyst complex for accelerating polymerization of said components, and (iv) a retarder component in sufficient amount for temporarily delaying the onset of said polymerization; and (c) storing components (a) and (b) until ready for use. - View Dependent Claims (22, 23)
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24. A polymerizable polyorganosiloxane composition, including a catalyst for polymerization, said composition for making a dental impression, comprising:
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(a) a QM resin, containing vinyl groups; (b) a linear vinyl terminated polydimethyl-siloxane fluid, forming with said QM resin a dispersion having a vinyl content of about 0.16 to 0.24 m-mole/g; (c) an organohydrogen polysiloxane for cross-linking said vinyl groups; (d) an organoplatinum catalyst complex for accelerating polymerization of said components; (e) an emulsifying plasticizer for said catalyst complex; (f) a retarder component in sufficient amount for temporarily delaying the onset of said polymerization; (g) a filler, wherein said filler comprises about 15 to about 45 weight percent of said composition, and wherein herein said filler comprises a mixture of about 14-24 weight percent crystalline silicone dioxide, about 3-6 weight percent amorphous silicone dioxide and about 4-8 weight percent silanated fumed silicone dioxide each based on 100% weight percent of the composition; and (h) a surfactant that imparts wettability to said composition, wherein said composition surface contact angle with water is less than 50°
after three minutes. - View Dependent Claims (25)
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26. A method of making a polymerizable polyorganosiloxane composition, including a polymerization catalyst, comprising:
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(a) forming a first dispersion, including, (i) a QM resin containing vinyl groups, dispersed in a linear vinyl terminated polydimethylsiloxane fluid, said dispersion having a viscosity of about 5,000-60,000 cps and a vinyl content of about 0.16 to 0.24 m-mole/g, (ii) an organohydrogen polysiloxane having a viscosity of about 35-45 cps for cross-linking said vinyl groups, (iii) a filler wherein said filler comprises about 15 to about 45 weight percent of said composition, and wherein herein said filler comprises a mixture of about 14-24 weight percent crystalline silicone dioxide, about 3-6 weight percent amorphous silicone dioxide and about 4-8 weight percent silanated fumed silicone dioxide each based on 100% weight percent of the composition; and (iv) a surfactant that imparts wettability to said composition, wherein said composition surface contact angle with water is less than 50°
after three minutes; and
,(b) mixing a second dispersion, comprising, (i) a QM resin containing vinyl groups, dispersed in a linear vinyl terminated polydimethylsiloxane fluid, said dispersion having a viscosity of about 5000-60,000 cps and a vinyl content of about 0.16 to 0.24 m-mole/g, (ii) a filler, (iii) an organoplatinum catalyst complex for accelerating polymerization of said components, and (iv) a retarder component in sufficient amount for temporarily delaying the onset of said polymerization; and (c) storing dispersions (a) and (b) until ready for use.
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Specification