Dental composition comprising a) carbosilane containing component comprising - at least 1 Si - Aryl bend, - at least 1 silicon atom, - at least 2 unsaturated moieties, - no Si - Oxygen bond, b) Si-H functional component, c) initiator, d) optionally filler, e) optionally component selected from modifiers, dyes, pigments, thixotropic agents, flow improvers, polymeric thickeners, surfactants, odorous substances, diluting agent(s) and flavourings, wherein component is represented by one of formulas,, (IIIa) or (IIIb): B-D-E-{Aryl-[Si a (D-B) b] n} m with independently selected from each other m = 1; n = 1; E = (cyclo)aliphatic moiety, wherein at least one C atom may be substituted by a Si atom and wherein other C and/or H atoms can be substituted by O, Br, Cl, and Si atoms; {Aryl-[Si a (D-B) b] n} m with independently selected from each other m = 1 n = 2, 3, 4, 5 or 6; F-{Aryl-[Si a (D-B) b] n} m (IIIa) with independently selected from each other m = 2, 3 or 4; n = 1, 2, 3, 4, 5 or 6; F = (cyclo)aliphatic moiety, wherein C and/or H atoms can be substituted by O, Br, Cl, and Si atoms; Aryl-[Si a (D-B) b] n (IIIIb) with independently selected from each other Aryl = alfyl-benzene; A = (cyclo)aliphatic moiety or aliphatic aromatic moiety; B = unsaturated moiety as terminal C 2 based olefinic moiety attached onto a spacer D; D = spacer = aromatic aliphatic moiety with C 7 as α,3/4-toluenediyl with the phenyl ring attached to Si and the methylene group attached to aliphatic epoxy moiety B; a = 0, 1 or 2; b = 1, 2 or 3; n = 1 wherein the other indices are defined as follows; A = aliphatic or cycloaliphatic moiety C 1 to C 6 or aromatic moiety C 6 to C 14; B = unsaturated moiety attached onto a spacer D; D = spacer = (cycla)aiiphafic moiety wherein C and/or H atoms can be substituted by O, Br, Cl, and Si atoms and which can comprise a bicyclic structural element; Br = bromine atom; C = carbon atom; Cl = chlorine atom; H = hydrogen atom; O = oxygen atom; Si = silicon atom; Aryl = aromatic moiety; a + b = 3; a = 0, 1 or 2; b = 1, 2 our 3 a) carbosilane containing component comprising - at least 1 Si - Aryl bend, - at least 1 silicon atom, - at least 2 unsaturated moieties, - no Si - Oxygen bond, - at least 1 Si - Aryl bend, - at least 1 silicon atom, - at least 2 unsaturated moieties, - no Si - Oxygen bond, b) Si-H functional component, c) initiator, d) optionally filler, e) optionally component selected from modifiers, dyes, pigments, thixotropic agents, flow improvers, polymeric thickeners, surfactants, odorous substances, diluting agent(s) and flavourings, m = 1; n = 1; E = (cyclo)aliphatic moiety, wherein at least one C atom may be substituted by a Si atom and wherein other C and/or H atoms can be substituted by O, Br, Cl, and Si atoms; {Aryl-[Si a (D-B) b] n} m with independently selected from each other m = 1 n = 2, 3, 4, 5 or 6; F-{Aryl-[Si a (D-B) b] n} m (IIIa) with independently selected from each other m = 2, 3 or 4; n = 1, 2, 3, 4, 5 or 6; F = (cyclo)aliphatic moiety, wherein C and/or H atoms can be substituted by O, Br, Cl, and Si atoms; Aryl-[Si a (D-B) b] n (IIIIb) Aryl = alfyl-benzene; A = (cyclo)aliphatic moiety or aliphatic aromatic moiety; B = unsaturated moiety as terminal C 2 based olefinic moiety attached onto a spacer D; D = spacer = aromatic aliphatic moiety with C 7 as α,3/4-toluenediyl with the phenyl ring attached to Si and the methylene group attached to aliphatic epoxy moiety B; a = 0, 1 or 2; b = 1, 2 or 3; n = 1 A = aliphatic or cycloaliphatic moiety C 1 to C 6 or aromatic moiety C 6 to C 14; B = unsaturated moiety attached onto a spacer D; D = spacer = (cycla)aiiphafic moiety wherein C and/or H atoms can be substituted by O, Br, Cl, and Si atoms and which can comprise a bicyclic structural element; Br = bromine atom; C = carbon atom; Cl = chlorine atom; H = hydrogen atom; O = oxygen atom; Si = silicon atom; Aryl = aromatic moiety; a + b = 3; a = 0, 1 or 2; b = 1, 2 our 3