Dental composition and use thereof

1. A dental composition comprising:

Polymerizable monomer (1),

Initiator component(s),

Filler component(s) in an amount of more than 20 wt.-%, wt.-% with respect to the whole weight of the composition,

the polymerizable monomer (1) being characterized by formula (I)

with:

B—O-A-[—O—B′—] a representing the unsymmetrical monomer backbone as linkage between the reactive (meth)acrylate moieties,

a=0 or 1,

A being selected from:

A being always attached as aryl-alkyl ether onto B and/or B′,

B being selected from:

*—(CH 2 ) b —*, *—(CH 2 —CH 2 —O—CH 2 —CH 2 )—*, *—(CH 2 —CH 2 —O—CH 2 —CH 2 —CH 2 )—*, *—(CH 2 —CH 2 —CH 2 —O—CH 2 —CH 2 —CH 2 )—*,

B being always attached as alkyl ester onto the (meth)acrylate reactive moiety,

b=2 to 6,

B′ being selected from *—(CH2) b′ —*, *—(CH 2 —CH 2 —O—CH 2 —CH 2 )—*,

B′ being always attached as alkyl ester onto the (meth)acrylate reactive moiety,

b′=2 to 6,

R═H, methyl,

X being selected from H, methyl, ethyl, hexyl, tert-butyl,

“*” representing those site(s) of a moiety of the monomer, where that moiety is bonded to another moiety of the monomer.

2. The dental composition according to claim 1 , the polymerizable monomer (1) being characterized by either formula (Ia) or formula (Ib)

with:

B—O-A-O—B′ being an unsymmetrical monomer backbone as linkage between the reactive (meth)acrylate moieties,

A being selected from

A being always attached as aryl-alkyl ether onto B and B′,

B being selected from:

*—(CH 2 ) b —*, *—(CH 2 —CH 2 —O—CH 2 —CH 2 )—*, *—(CH 2 —CH 2 —O—CH 2 —CH 2 —CH 2 )—*, *—(CH 2 —CH 2 —CH 2 —O—CH 2 —CH 2 —CH 2 )—*,

B being always attached as alkyl ester onto the (meth)acrylate reactive moiety,

b=2 to 6,

B′ being selected from: *—(CH 2 ) b —*, *—(CH 2 —CH 2 —O—CH 2 —CH 2 )—*,

B′ being always attached as alkyl ester onto the (meth)acrylate reactive moiety,

b′=2 to 6,

R═H, methyl,

X═H, methyl, ethyl, hexyl, tert-butyl;

or

with:

B—O-A being an unsymmetrical monomer backbone as linkage between the reactive (meth)acrylate moieties,

A being selected from:

A being always attached as aryl-alkyl ether onto B and always attached as alkyl ester onto the (meth)acrylate reactive moiety,

B being selected from:

*—(CH 2 ) b —*, *—(CH 2 —CH 2 —O—CH 2 —CH 2 )—*,

B being always attached as alkyl ester onto the (meth)acrylate reactive moiety,

b=2 to 6,

R═H, methyl;

“*” representing those sites of a moiety of the monomer, where that moiety is bonded to another moiety of the monomer.

3. The dental composition according to claim 1 , wherein the polymerizable monomer (1) has a molecular weight of about 300 to about 600, the polymerizable monomer (1) does not solidify at 23° C. or both.

4. The dental composition according to claim 1 , the polymerizable monomer (1) being selected from one of the following monomers and mixtures thereof:

5. The dental composition according to claim 1 , the polymerizable monomer (1) being selected from one of the following monomers and mixtures thereof:

R being always independently selected from H and CH3.

6. The dental composition according to claim 1 , the initiator being selected from radiation curing, redox curing, heat curing initiators and combinations thereof.

7. The dental composition according to claim 1 comprising the respective components in the following amounts:

Polymerizable monomer(s) (1): from about 1 to about 75 wt.-%,

Initiator(s): from about 0.1 to about 10 wt.-%,

Filler(s): from about 20 to about 90 wt.-%.

8. The dental composition according to claim 1 further comprising in addition a polymerizable monomer (3) comprising a urethane moiety.

9. The dental composition according to claim 1 not comprising solvent(s) in an amount above about 10 wt.-%.

10. The dental composition according to claim 1 , wherein the dental composition has at least one or all of the following features before curing:

Viscosity: from about 0.5 to about 200 Pa*s measured at 23° C. with a shear rate of 100 l/s;

pH value if brought in contact with water: about 1 to about 9,

radiation or redox curing, and

storage stable.

11. The dental composition according to claim 1 , wherein the dental composition after curing has a

Compressive strength determined according to ISO 4049 using specimens having the dimension of 3 mm×3 mm×5 mm of at least 430 MPa; and a

Compressive strength determined according to DIN 53454 using cylindrical specimens with a diameter of 4 mm and a height of 8 mm of at least 280 MPa.

12. The dental composition according to claim 1 , wherein the

Polymerizable monomer(s) (1) is present in an amount from about 1 to about 75 wt.-%,

Initiator(s), being selected from radiation curing or redox curing initiator(s), and Filler(s) being selected from silica or silica/zirconia filler(s) and mixtures thereof, in an amount from about 20 to about 90 wt.-%.

13. The dental composition according to claim 1 being provided as one or two part system.

14. An article comprising:

the dental composition according to claim 1 , the article in the form of a dental filling material, crown and bridge material, inlay, onlay, veneer or dental mill blank.

15. A method comprising:

applying a rapid-prototyping technique to the dental composition according to claim 1 to produce a dental restoration.

16. The method according to claim 15 , wherein the dental restoration is selected from a dental crown, a bridge, or an onlay or inlay.