Block-like composite material for dental cutting and processing having multilayered structure including layers with different transparencies and containing fiber material

Patent metadata

Field	Value
Publication number	US-11141247-B2
Application number	US-201615178644-A
Country	US
Kind code	B2
Filing date	Jun 10, 2016
Priority date	Jan 13, 2016
Publication date	Oct 12, 2021
Grant date	Oct 12, 2021

Abstract

The present invention relates to a composite material which can be used as a dental prosthesis device (crown, bridge), and specifically, relates to a composite material including a curable resin and a fiber material, and more specifically relates to a block-like composite material for dental cutting and processing characterized by having a multilayered structure including at least two layers having different transparencies. There are no technical information relating to a color tone and a transparency of the fiber material. To provide a block-like composite material for dental cutting and processing, wherein the block-like composite material has a multilayered structure including at least two layers having different transparencies, and the each layer includes a curable resin and a fiber material.

First claim

What is claimed is:

1. A block-like composite material for dental cutting and processing, wherein
the block-like composite material has a multilayered structure comprising at least two layers having different transparencies including a highly transparent layer and a low transparent layer,
wherein:
the each layer includes a curable resin and a fiber material,
the different transparencies are obtained by adjusting a difference in refractive indexes between the curable resin and the fiber material in each of the at least two layers,
the highly transparent layer has a higher transparency than the low transparent layer, and
a boundary between the layers consists of a flat plane.

2. The block-like composite material for dental cutting and processing according to claim 1 , wherein,
the block-like composite material includes three layers consisting of the highly transparent layer, a middle transparency layer and the low transparent layer,
a contrast ratio of the highly transparent layer is less than 0.50,
a contrast ratio of the middle transparency layer is 0.50 or more and less than 0.60, and
a contrast ratio of the low transparent layer is 0.60 or more.

3. The block-like composite material for dental cutting and processing according to claim 1 , wherein,
the block-like composite material includes four or more layers comprising the highly transparent layer, a middle transparency layer and the low transparent layer,
a contrast ratio of the highly transparent layer is less than 0.50,
a contrast ratio of the middle transparency layer is 0.50 or more and less than 0.60,
a contrast ratio of the low transparent layer is 0.60 or more,
each of the highly transparent layer, the middle transparency layer and the low transparent layer consists of a single layer or a plurality of layers having different transparencies, and
a difference of contrast ratio between each layer is 0.02 or more.

4. The block-like composite material for dental cutting and processing according to claim 1 , wherein,
a shape of the fiber material is at least one selected from the group consisting of roving, strand, yarn, sheet, ribbon, and tape.

5. The block-like composite material for dental cutting and processing according to claim 4 , wherein,
the fiber material is formed from a long-fiber material.

6. The block-like composite material for dental cutting and processing according to claim 4 , wherein,
the fiber material is formed from at least one selected from the group consisting of A-glass, C-glass, D-glass, E-glass, ECR-glass, AR-glass, R-glass, S-glass, alumina, zirconia, polyethylene, polyester, polyamide, and collagen.

7. The block-like composite material for dental cutting and processing according to claim 1 , wherein,
refractive indexes of the curable resins in the respective layers are the same as each other.

8. The block-like composite material for dental cutting and processing according to claim 1 , wherein,
a contrast ratio of the highly transparent layer is less than 0.50, and
a contrast ratio of the low transparent layer is 0.50 or more.

9. The block-like composite material for dental cutting and processing according to claim 1 , wherein,
a content of the fiber material is from 30 to 70 wt % of the block-like composite material, and
a content of a filler other than the fiber material is 50 wt % or less of the block-like composite material.

Assignees

• Shofu Inc

Inventors

• Teramae Mitsuji
• Goto Masanori

Classifications

• B28B1/16

  for producing layered articles (coating B28B11/04) · CPC title

• A61K6/16 Primary

  Refractive index · CPC title

• A61K6/836

  Glass · CPC title

• A61C13/0022 Primary

  Blanks or green, unfinished dental restoration parts · CPC title

• A61C13/09

  {Composite teeth, e.g. front and back section (A61C13/0835, A61C13/1023 take precedence)}; Multilayer teeth · CPC title