Radically polymerizable dental material which contains as initiator for the radical polymerization a combination of a thiourea derivative and a bisacyldialkylgermanium compound.

The present invention relates to dental, light-curable, one-component composite compositions comprising (A) monomers, (B) fillers, and (C) initiators, the viscosity ?.sub.20 of which at 20? C. is greater than 400 Pa*s, preferably greater than 800 Pa*s and more preferably greater than 1200 Pa*s, and the viscosity ?.sub.50 of which at 50? C. is less than 150 Pa*s, preferably less than 120 Pa*s and more preferably less than 90 Pa*s, and wherein the quotient ?.sub.50/?.sub.20 of the viscosity of the composite composition at 50? C. and the viscosity of the composite composition at 20? C. is less than 0.125, preferably less than 0.1. The invention is preferably directed to dental composite compositions selected from the group consisting of dental filling materials, lining materials, luting materials and fissure sealants.

The present invention relates to dental, light-curable, one-component composite compositions comprising (A) monomers, (B) fillers, and (C) initiators, the viscosity ?.sub.20 of which at 20? C. is greater than 400 Pa*s, preferably greater than 800 Pa*s and more preferably greater than 1200 Pa*s, and the viscosity ?.sub.50 of which at 50? C. is less than 150 Pa*s, preferably less than 120 Pa*s and more preferably less than 90 Pa*s, and wherein the quotient ?.sub.50/?.sub.20 of the viscosity of the composite composition at 50? C. and the viscosity of the composite composition at 20? C. is less than 0.125, preferably less than 0.1. The invention is preferably directed to dental composite compositions selected from the group consisting of dental filling materials, lining materials, luting materials and fissure sealants.

[Problem]

It has been difficult to prepare a mill blank for dental cutting and machining in a state of no cracks or breaks.

[Solution]

To provide a curable composition for use in a mill blank for dental cutting and machining, comprising 14 to 36% by mass of (A) bifunctional urethane methacrylate monomer represented by Formula 1, 2 to 12% by mass of (B) bifunctional methacrylate monomer not containing a urethane group, 60 to 80% by mass of (C) inorganic filler, 0.1 to 0.5% by mass of (D) thermal polymerization initiator, and 0.1 to 0.5% % by mass of (E) chain transfer agent.

##STR00001##

A dental restorative curable compositions may have a high mechanical strength and excellent water resistance and polishability in the form of a cured product. A dental composite resin may include such compositions. A dental mill blank may include the cured product of such compositions. A dental restorative curable composition may include: a (meth)acrylic acid ester compound (A) having two or more (meth)acryloyloxy groups per molecule; a mono(meth)acrylic acid ester compound (B); an inorganic filler (C) having an average primary particle diameter of 0.01 to 5 m; and a polymerization initiator (D). The mono(meth)acrylic acid ester compound may include at least one selected from the group consisting of a mono(meth)acrylic acid ester compound (B-1) of formula (I): ##STR00001##
and
a mono(meth)acrylic acid ester compound (B-2) of formula (II): ##STR00002##

A dental restorative curable compositions may have a high mechanical strength and excellent water resistance and polishability in the form of a cured product. A dental composite resin may include such compositions. A dental mill blank may include the cured product of such compositions. A dental restorative curable composition may include: a (meth)acrylic acid ester compound (A) having two or more (meth)acryloyloxy groups per molecule; a mono(meth)acrylic acid ester compound (B); an inorganic filler (C) having an average primary particle diameter of 0.01 to 5 m; and a polymerization initiator (D). The mono(meth)acrylic acid ester compound may include at least one selected from the group consisting of a mono(meth)acrylic acid ester compound (B-1) of formula (I): ##STR00001##
and
a mono(meth)acrylic acid ester compound (B-2) of formula (II): ##STR00002##

A dental composition that includes one or more monomers, a plurality of crosslinking agents, and an initiator.

The present invention provides a dental color tone adjustment material kit that has improved properties in terms of surface drying and of discoloration after curing and that enables adjustment to a desired color tone. The present invention relates to a dental color tone adjustment material kit including: a primer composition (A) including an acid group-containing polymerizable monomer (a) and a volatile organic solvent (b); and a dental color tone adjustment material B including a polymerizable monomer (d), a polymerization initiator (e), particle aggregates (f) that are chain aggregates of ultrafine filler particles having an average primary particle diameter of 1 to 50 nm, titanium dioxide (g), and a pigment (h). The monomer (a) accounts for 0.05 to 45 weight % of the primer composition (A), and the organic solvent (b) accounts for 55 to 99.95 weight % of the primer composition (A). The monomer (d) includes a polyfunctional acrylate monomer (d1) and a volatile monofunctional (meth)acrylate monomer (d2), and the monomers (d1) and (d2) account for 88 weight % or more of the monomer (d). The content of the particle aggregates (f) is 5 to 20 parts by weight, and the content of the titanium dioxide (g) is 0.05 to 2 parts by weight, per 100 parts by weight of the total of the monomer (d) and the particle aggregates (f).

Radically polymerizable dental material which contains as initiator for the radical polymerization a combination of a thiourea derivative and a bisacyldialkylgermanium compound.

The present invention relates to dental, light-curable, one-component composite compositions comprising (A) monomers, (B) fillers, and (C) initiators, the viscosity .sub.20 of which at 20 C. is greater than 400 Pa*s, preferably greater than 800 Pa*s and more preferably greater than 1200 Pa*s, and the viscosity .sub.50 of which at 50 C. is less than 150 Pa*s, preferably less than 120 Pa*s and more preferably less than 90 Pa*s, and wherein the quotient .sub.50/.sub.20 of the viscosity of the composite composition at 50 C. and the viscosity of the composite composition at 20 C. is less than 0.125, preferably less than 0.1. The invention is preferably directed to dental composite compositions selected from the group consisting of dental filling materials, lining materials, luting materials and fissure sealants.