Kit of parts for conducting a dental impression and retraction process

1. A kit of parts comprising Paste (A), Paste (B) and Paste (C) for conducting a dental impression and retraction process, comprising:

Paste (A) comprising:

at least one polyorganosiloxane with at least two olefinically unsaturated groups;

at least one organohydrogenpolysiloxane; and

at least one alkylsiloxane having at least one carbinol, silanol, alkoxy, carboxyl or amino group;

Paste (B) comprising:

at least one polyorganosiloxane optionally with olefinically unsaturated groups and

at least one addition cure catalyst;

and

Paste (C) comprising:

a softener; and

a condensation cure catalyst;

wherein the condensation cure catalyst 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 Paste (C);

comprising a Ti, Zr, Zn or Sn containing component.

2. The kit of parts of claim 1 , the addition cure catalyst 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 calculated as elemental platinum with respect to the weight of Paste (B).

3. The kit of parts claim 1 , Paste (A) being characterized by at least one of the following features:

having a consistency according to ISO 4823 in the range from 25 to 50 mm;

having a water contact angle, measured 10 s after placing a drop of water onto the surface of the paste of <90°.

4. The kit of parts of claim 1 , Paste (B) having a consistency of 25 to 50 mm, if determined according to ISO 4823.

5. The kit of parts of claim 1 , Paste (C) having a consistency of 25 to 50 mm, if determined according to ISO 4823.

6. The kit of parts to the of claim 5 , the additive(s) being selected from hydrophilating agent(s), retarder(s), inhibitor(s), colourant(s), stabilizer(s), flavouring(s), hydrogen scavenger(s), rheology modifier(s), astringent(s) and mixtures thereof.

7. A process for taking a dental impression of a dentition including sub-gingival parts of the sulcus, the process comprising:

providing the kit of parts as described in claim 1 ;

mixing Paste (A), Paste (B) and Paste (C) to obtain Composition (ABC);

applying Composition (ABC) into the sulcus of the dentition;

mixing Paste (A) and Paste (B) to obtain Composition (AB);

applying Composition (AB) in contact with Composition (ABC;

optionally applying a further Composition (D) being different from Composition (AB) and Composition (ABC) in contact with Composition (AB); and

removing Composition (ABC) and Composition (AB) and Composition (D), if present, from the dentition.

8. The process of claim 7 , wherein in step b) the mixing ratio of Paste (A), Paste (B) and Paste (C) is (A+B):C from 1:1 to 20:1 by volume, wherein Paste (A) and Paste (B) are mixed in a ratio from 10:1 to 1:5.

9. The process of claim 7 , wherein in step d) the mixing ratio of Paste (A), Paste (B) is from 10:1 to 1:5 by volume.

10. The process of claim 7 , wherein the Composition (ABC) is used in a smaller volume compared to Composition (AB).

11. The process of claim 7 , Composition (ABC) being characterized by at least one or all of the following features:

Consistency according to ISO 4823 of <30 mm;

Shore hardness A determined 10 min after mixing: >20;

Residual gap resistance: larger than 0.50 mm;

Water contact angle, measured 10 s after placing a drop of water onto the surface of the paste, of <90°;

Colour of Composition (ABC) being different from colour of Composition (AB).

12. The process of claim 7 , Composition (AB) being characterized by at least one or all of the following features:

Consistency according to ISO 4823 of >31 mm;

Shore hardness A determined 10 min after mixing: >20;

Residual gap behaviour: less than or equal to 0.2 mm;

Water contact angle, measured 10 s after placing a drop of water onto the surface of the paste, of <90.

13. A system for storing and delivering Paste (A), Paste (B) and Paste (C) as described in claim 1 , the system comprising three compartments for storing the respective pastes, means for delivering the respective pastes to an outlet orifice and an interface for receiving a mixing tip.

14. A process of conducting a dental retraction and dental impression process, the process comprising:

mixing Paste (A), Paste (B) and Paste (C) to obtain Composition (ABC);

applying composition (ABC) into the sulcus of a dentition;

mixing Paste (A) and Paste (B) to obtain Composition (AB);

applying composition (AB) in contact with Composition (ABC);

and removing Composition (ABC) an Composition (AB) from the dentition,

wherein Paste (A) comprises:

at least one polyorganosiloxane with at least two olefinically unsaturated groups, and

at least one organohydrogenpolysiloxane,

at least one alkylsiloxane having at least one carbinol, silanol, alkoxy, carboxyl or amino group;

wherein Paste (B) comprises:

at least one polyorganosiloxane optionally with olefinically unsaturated groups,

at least one addition cure catalyst

wherein Paste (C) comprises:

a softener;

a condensation cure catalyst

wherein the condensation cure catalyst is 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 Paste (C);

comprising a Ti, Zr, Zn or Sn containing component.

15. The kit of parts of claim 1 , wherein Paste (A) further comprises filler(s).

16. The kit of parts of claim 1 , wherein Paste (A) further comprises additive(s).

17. The kit of parts of claim 1 , wherein Paste (B) further comprises at least one alkylsiloxane having at least one carbinol, silanol, alkoxy; carboxyl or amino group.

18. The kit of parts of claim 1 , wherein Paste (B) further comprises filler(s).

19. The kit of parts of claim 1 , wherein Paste (B) further comprises additive(s).

20. The kit of parts of claim 1 , wherein Paste (C) further comprises filler(s).

21. The kit of parts of claim 1 , wherein Paste (C) further comprises additive(s).

22. The kit of parts of claim 1 , wherein Paste (C) further comprises at least one polyorganosiloxane optionally with olefinically unsaturated groups.