Curable composition for dental retraction

Patent metadata

Field	Value
Publication number	US-11684553-B2
Application number	US-201816477702-A
Country	US
Kind code	B2
Filing date	Jan 15, 2018
Priority date	Jan 18, 2017
Publication date	Jun 27, 2023
Grant date	Jun 27, 2023

Abstract

The invention relates to a curable composition for dental retraction comprising a resin matrix comprising at least one polyorganosiloxane with at least two olefinically unsaturated groups as component A1, at least one organohydrogenpolysiloxane as component A2, optionally at least one vinyl functional QM silicone component as component A3, at least one alkylsiloxane having at least one carbinol, silanol, or alkoxy moiety as component B, optionally surfactant(s) as component E, optionally additive(s) as component F, a filler system comprising filler(s) as component D, a catalyst system comprising addition cure catalyst component C-A suitable to cure components A1 and A2, condensation cure catalyst component C-B suitable to cure component B, the curable composition being provided as a kit of part comprising a Catalyst Part I and a Base Part II the Catalyst Part I comprising components C-A, C-B, A1, the Base Part II comprising components A2, A1, B, wherein each of components D, E and F and A3, if present, can be present either in the Catalyst Part I or the Base Part II or the Catalyst Part I and the Base Part II, and wherein component B is present in an amount of 6 wt. % or more with respect to the whole composition.

First claim

The invention claimed is:

1. A kit of parts comprising a Catalyst Part I and a Base Part II for providing a curable composition for dental retraction, the kit of parts comprising:
the Catalyst Part I comprising:
component A1: at least one polyorganosiloxane with at least two olefinically unsaturated groups, and
a catalyst system comprising:
an addition cure catalyst component C-A suitable to cure components A1 and A2, and
a condensation cure catalyst component C-B suitable to cure component B;

the Base Part II comprising:
component A1: at least one polyorganosiloxane with at least two olefinically unsaturated groups
component A2: at least one organohydrogenpolysiloxane,
component B: at least one alkylsiloxane having at least one carbinol, silanol, or alkoxy moiety, wherein component B is present in an amount of at least 6 wt. % with respect to the weight of the curable composition,
component D comprising filler(s) in a total amount of 10 to 50 wt % with respect to the weight of the curable composition, wherein the filler(s) are present in one or more of the Catalyst Part I and the Base Part II,

wherein at least two different polyorganosiloxane with at least two olefinically unsaturated groups are present in the curable composition, the at least two polyorganosiloxane with at least two olefinically unsaturated groups differ in viscosity by a factor of at least 5, and
wherein of the at least two different polyorganosiloxane with at least two olefinically unsaturated groups, a higher viscosity polyorganosiloxane is present in an amount relative to a lower viscosity polyorganosiloxane at a ratio of 0.9:1 to 3:1.

2. The kit of parts of claim 1 , the addition cure catalyst component C-A being characterized by at least one of the following features:
comprising a Pt containing component;
being present in an amount from 0.00005 to 0.05 wt. % calculated as elemental platinum with respect to the weight of Catalyst Part I.

3. The kit of parts of claim 1 , the addition cure catalyst component C-B being characterized by at least one of the following features:
being present in an amount from 0.1 to 15.0 wt. % with respect to the weight of Catalyst Paste I;
comprising a component comprising Ti, Zr, Zn or Sn.

4. The kit of parts of claim 1 , component B being characterized by at least one or more of the following features:
molecular weight: 900 to 500,000 g/mol;
being present in an amount from 6 to 20 wt. % with respect to the composition.

5. The kit of parts of claim 1 , component A1 comprising one or more compounds of the following formula:

wherein each R is independently a hydrocarbon group having 1-6 carbon atoms, and
wherein n is a numerical value that provides a viscosity of component A1 between 4 and 1,000,000 mPa*s mPa*s at 23° C.

6. The kit of parts of claim 1 , wherein at least one of the at least one polyorganosiloxane with at least two olefinically unsaturated groups of component A1 a vinyl functional QM silicone.

7. The kit of parts of claim 1 , comprising:
polyorganosiloxane with at least two olefinically unsaturated groups as component A1 in an amount from 0.1 to 45 wt. %;
organohydrogenpolysiloxane as component A2 in an amount from 0.1 to 20 wt. %;
vinyl functional QM silicone component as component A3 in an amount from 0.1 to 65 wt. %;
alkylsiloxane having at least one carbinol, silanol, or alkoxy as component B in an amount of at least 6 wt. %;
surfactant(s) as component E in an amount from 0.05 to 10 wt. %;
additive(s) as component F in an amount from 0.01 to 20 wt. %;
catalyst component C-A in an amount from 0.00005 to 0.05 wt. %; and
catalyst component C-B in an amount from 0.1 to 15 wt. %,
wherein wt. % is with respect to the weight of the composition.

8. The kit of parts of claim 1 , the curable composition being characterized by one or more of the following parameters:
curing time: within 10 min at 23° C.;
Shore hardness A: from 25 to 80 determined according to DIN ISO 7619-1:2012-02;
tensile strength: from 1.0 to 10 determined according to DIN 53504:2009-10;
consistency of Catalyst Part I and/or the Base Part II being from 25 to 50 mm determined according to ISO 4823:2015;
water contact angle of Catalyst Part I and/or the Base Part II measured 10 s after placing a drop of water onto the surface of the composition: <90°; and
residual gap resistance: at least 2.0 mm.

9. The kit of parts of claim 1 , one or more of the Catalyst Part I and the Base Part II further comprising additives selected from retarder(s), inhibitor(s), colourant(s), stabilizer(s), flavouring(s), hydrogen scavenger(s), rheology modifier(s), and astringent(s), or mixtures thereof.

10. A method for retracting a tooth sulcus, the method comprising:
contacting the Catalyst Part I and the Base Part II of claim 1 to form a mixture;
applying the mixture into the tooth sulcus;
curing the mixture to form a cured composition; and
removing the cured composition from the tooth sulcus.

11. The kit of parts of claim 1 , further comprising composition of one or more of the following components:
dental impression material;
retraction caps;
application device; and
impression trays.

12. The method of claim 10 , wherein the applying is via a static mixing tip.

13. The kit of parts of claim 1 , one or more of the Catalyst Part I and the Base Part II further comprising one or more of
component E: surfactant(s),
component F: additive(s), and
component A3: at least one vinyl functional QM silicone.

14. The kit of parts of claim 1 , wherein the Catalyst Part I and the Base Part II are contained in a double-barrel syringe or double-barrel cartridge.

15. The kit of parts of claim 1 , wherein at least some filler(s) of component D are reinforcing inorganic compound(s) being characterized as having a BET surface of 50 m 2 /g to 400 m 2 /g.

16. The kit of parts of claim 15 , wherein reinforcing inorganic compound(s) are selected from pyrogenic, fumed, precipitated, and surface-treated silicic acids, or combinations thereof.

17. The kit of parts of claim 15 , wherein the reinforcing inorganic compound(s) are present in an amount from 0.1 to 20 wt. %.

18. The kit of parts of claim 1 , wherein at least some filler(s) of component D are non-reinforcing inorganic compound(s) being characterized by one of more the following features:
a particle size of less than or equal to 200 μm;
a BET surface less than 50 m 2 /g.

19. The kit of parts of claim 18 , wherein the non-reinforcing inorganic compound(s) are selected from quartz, cristobalite, calcium silicate, diatomaceous earth, zirconium silicate, montmorillonite, zeolite, sodium aluminum silicate, aluminum oxide, titanium oxide, zinc oxide, barium sulphate, calcium carbonate, plaster, and glass, or combinations thereof.

20. The kit of parts of claim 18 , wherein the non-reinforcing inorganic compound(s) are present in an amount from 10 to 50 wt. %.

Assignees

• 3M Innovative Properties Company

Inventors

• Hoffmann Henning
• Osswald Peter
• Zech Joachim

Classifications

• C08L51/085

  on to polysiloxanes · CPC title

• A61K6/19 Primary

  Self-expanding, e.g. for filling teeth · CPC title

• A61K6/90

  Compositions for taking dental impressions · CPC title

• A61C9/0033

  Gingival retraction appliances · CPC title

• C08L83/04

  Polysiloxanes · CPC title