Dental restorative composition

Patent metadata

Field	Value
Publication number	US-9993394-B2
Application number	US-201515119053-A
Country	US
Kind code	B2
Filing date	Feb 17, 2015
Priority date	Feb 20, 2014
Publication date	Jun 12, 2018
Grant date	Jun 12, 2018

Abstract

Provided is a dental restorative composition that has good handling properties when in the form of a paste having yet to be cured and that has light diffusion ability and transparency when in the form of a cured product. The dental restorative composition includes a polymerizable monomer, a polymerization initiator, an inorganic filler (C) having an average particle diameter of 0.1 to 1 μm, an organic-inorganic composite filler (D) having an average particle diameter of 1 μm or more and less than 10 μm, and an organic-inorganic composite filler (E) having an average particle diameter of 10 to 50 μm. An absolute value of a difference between a refractive index (Cd) of the inorganic filler (C) and a refractive index (Ad) of a polymer of the polymerizable monomer is 0.01 or less, an absolute value of a difference between the refractive index (Ad) and one of a refractive index (Dd) of the organic-inorganic composite filler (D) and a refractive index (Ed) of the organic-inorganic composite filler (E) is 0.01 or less, and an absolute value of a difference between the refractive index (Ad) and the other of the refractive index (Dd) and the refractive index (Ed) is 0.03 or more.

First claim

The invention claimed is:

1. A dental restorative composition comprising:
a polymerizable monomer (A):
a polymerization initiator (B);
an inorganic filler (C) having an average particle diameter of 0.1 to 1 μm: and
an organic-inorganic composite filler, wherein
the organic-inorganic composite filler comprises
an organic-inorganic composite filler (D) having an average particle diameter of 1 μm or more and less than 10 μm, and
an organic-inorganic composite filler (D) having an average particle diameter of 10 to 50 μm,

an absolute value of a difference between a refractive index (Cd) of the inorganic filler (C) and a refractive index (Ad) of a polymer of the polymerizable monomer (A) is 0.01 or less,
an absolute value of a difference between the refractive index (Ad) and one of a refractive index (Dd) of the organic-inorganic composite filler (D) and a refractive index (Ed) of the organic-inorganic composite filler (E) is 0.01 or less, and
an absolute value of a difference between the refractive index (Ad) and the other of the refractive index (Dd) and the refractive index (Ed) is 0.03 or more.

2. The dental restorative composition according to claim 1 , wherein the average particle diameter of the inorganic filler (C) is 0.2 to 0.7 μm.

3. The dental restorative composition according to claim 1 , wherein one of the organic-inorganic composite filler (D) and the organic-inorganic composite filler (E) comprises an inorganic filler having a refractive index equal to the refractive index of the inorganic filler (C).

4. The dental restorative composition according to claim 1 , wherein the organic-inorganic composite filler (D) and the organic-inorganic composite filler (E) each have a transparency (ΔL*) of 30 or more.

Assignees

• Kuraray Noritake Dental Inc

Inventors

• Kita Hirotaka
• Kawana Michiya
• Terakawa Eiichi

Classifications

• A61K6/16

  Refractive index · CPC title

• A61K6/887 Primary

  Compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds · CPC title

• A61K6/831

  comprising non-metallic elements or compounds thereof, e.g. carbon · CPC title

• A61K6/62 Primary

  Photochemical radical initiators · CPC title

• A61K6/17

  Particle size · CPC title