Dental adhesive composition, preparation and use thereof

1. A dental adhesive composition comprising:

ethylenically unsaturated component(s) with acidic moiety;

ethylenically unsaturated component(s) without acidic moiety;

water;

sensitizing agent(s);

reducing agent(s); and

a silane composition comprising:

(meth)acrylate functional silane(s), and

amino functional silane(s),

wherein the (meth)acrylate functional silane(s) is present in equal proportion or in excess with respect to weight over the amino functional silane(s), and

wherein the dental adhesive composition exhibits a shear bond strength to hydrofluoric acid etched lithium disilicate and feldspathic dental ceramics of at least 20 MPa according to DIN EN ISO 29022 (2013-09).

2. The dental adhesive composition of claim 1 , the (meth)acrylate functional silane being characterized by one or more of the following features:

Molecular weight: 200 to 400 g/mol;

Formula:

A m -B—Si(R 1 ) n (OR 2 ) 3-n

wherein:

A is a (meth)acrylate,

B is selected from (i) linear or branched C 1 to C 12 alkyl, (ii) C 6 to C 12 aryl, (iii) organic group having 2 to 20 carbon atoms, wherein the organic group comprises one or more ether, thioether, ester, thioester, thiocarbonyl, amide, urethane, carbonyl, and sulfonyl linkages,

R 1 is a C 1 to C 6 alkyl group, or an C 6 to C 12 aryl group,

R 2 is a C 1 to C 6 alkyl group,

m=1, 2, 3, or 4, and

n=0, 1, or 2.

3. The dental adhesive composition of claim 1 , the amino functional silane being characterized by one or more of the following features:

Molecular weight: 160 to 500 g/mol;

Formula:

A-B—Si(R 1 ) n (OR 2 ) 3-n

wherein:

A is an amino moiety,

B is selected from (i) linear or branched C 1 to C 12 alkyl, (ii) C 6 to C 12 aryl, (iii) organic group having 2 to 20 carbon atoms, wherein the organic group comprises one or more ether, thioether, ester, thioester, thiocarbonyl, amino, amide, urethane, carbonyl, and sulfonyl linkages,

R 1 is a C 1 to C 6 alkyl group or a C 6 to C 12 aryl group,

R 2 is a C 1 to C 6 alkyl group, and

n=0, 1, or 2.

4. The dental adhesive composition of claim 1 , wherein:

ethylenically unsaturated component(s) with acidic moiety is present in an amount of 2 to 20 wt. %,

ethylenically unsaturated component(s) without acidic moiety is present in an amount of 20 to 60 wt. %,

water is present in an amount of 5 to 20 wt. %,

sensitizer(s) is present in an amount of 0.1 to 3 wt. %,

reducing agent(s) is present in an amount of 0.1 to 3 wt. %,

(meth)acrylate functional silane is present in an amount of 0.5 to 5 wt. %,

amino functional silane is present in an amount of 0.2 to 4 wt. %,

optionally solvent(s) is present in an amount of 0 to 50 wt. %, and

optionally stabilizers is present in an amount of 0 to 1 wt. %,

wt. % with respect to the weight of the composition.

5. The dental adhesive composition of claim 1 , wherein:

ethylenically unsaturated component(s) with a phosphoric acidic moiety is present in an amount of 1 to 5 wt. %,

ethylenically unsaturated component(s) without acidic moiety is present in an amount of 1 to 5 wt. %,

water is present in an amount of 1 to 5 wt. %,

sensitizer(s) is present in an amount of 0.1 to 0.5 wt. %,

reducing agent(s) is present in an amount of 0.1 to 0.5 wt. %,

non-surface treated filler is present in an amount of 0.1 to 2 wt. %,

(meth)acrylate functional silane is present in an amount of 0.5 to 3 wt. %,

amino functional silane is present in an amount of 0.5 to 3 wt. %, and

solvent(s) is present in an amount of 70 to 95 wt. %,

wt. % with respect to the weight of the composition.

6. The dental adhesive composition of claim 1 , further comprising filler(s) in an amount of 0.1 to 40 wt. %.

7. The dental adhesive of claim 1 , being characterized by one or more of the following features:

Viscosity: 0.01 to 3 Pa*s at 23° C.; and

pH value: 1 to 5.

8. The dental adhesive composition of claim 1 , for use in affixing a dental restoration to a dental surface.

9. A process for treating a dental surface, the process comprising:

providing a dental adhesive composition of claim 1 ,

applying the dental adhesive composition to one or more of the dental surface and a dental restoration.

10. The process of claim 9 , the dental restoration having the shape of a dental crown, dental bridge, dental post, dental veneer, dental inlay, dental onlay, dental implant, or any part thereof.

11. The process of claim 9 , wherein the dental restoration comprises one or more of the following materials: metal, zirconia, alumina, feldspathic glass ceramic, lithium disilicate ceramic, porcelain fused to metal, and composite veneered metal.

12. A kit comprising:

a dental adhesive composition of claim 1 ; and

one or more of the following parts:

dental filling material,

dental milling blank,

dental cement,

hydrofluoric acid etchant,

sandblasting medium, and

sandblasting device.

13. A process for preparing a dental adhesive composition, the process comprising the steps:

providing components of a dental adhesive composition of claim 1 ; and

mixing the components.

14. The kit of claim 12 , wherein the dental adhesive composition is provided as a one-part composition.