RESIN BLOCK AND PROCESS FOR PRODUCING THE SAME
First Claim
1. A resin block that contains a thermoplastic resin having a fluidizing temperature in a range of 310 to 500°
- C. and inorganic particles in an amount of 30 to 150 parts by mass per 100 parts by mass of said thermoplastic resin, and that can be used as a material for producing a dental prosthetic through the milling work, wherein;
the inorganic particles are at least one kind of inorganic oxide particles selected from the group consisting of silica particles, silica composite particles of silica and other metal oxides, titania particles, and titania composite particles of titania and other metal oxides;
the resin block has a thick portion of a thickness of at least not less than 5 mm; and
the resin block does not contain any void whose length is not less than 1.0 mm.
1 Assignment
0 Petitions
Accused Products
Abstract
A resin block that can be favorably used for obtaining dental prosthetics through the milling work, containing very little voids, having excellent property for being cut, exhibiting excellent appearance and mechanical strength, and without permitting the formation of defective products. The resin block contains a thermoplastic resin having a fluidizing temperature in a range of 310 to 500° C. and inorganic particles in an amount of 30 to 150 parts by mass per 100 parts by mass of said thermoplastic resin. The inorganic particles are at least one kind of inorganic oxide particles selected from the group consisting of silica particles, silica composite particles of silica and other metal oxides, titania particles, and titania composite particles of titania and other metal oxides. The resin block has a thick portion of a thickness of at least not less than 5 mm, and does not contain any void whose length is not less than 1.0 mm.
2 Citations
12 Claims
-
1. A resin block that contains a thermoplastic resin having a fluidizing temperature in a range of 310 to 500°
- C. and inorganic particles in an amount of 30 to 150 parts by mass per 100 parts by mass of said thermoplastic resin, and that can be used as a material for producing a dental prosthetic through the milling work, wherein;
the inorganic particles are at least one kind of inorganic oxide particles selected from the group consisting of silica particles, silica composite particles of silica and other metal oxides, titania particles, and titania composite particles of titania and other metal oxides; the resin block has a thick portion of a thickness of at least not less than 5 mm; and the resin block does not contain any void whose length is not less than 1.0 mm. - View Dependent Claims (2, 3, 4, 5)
- C. and inorganic particles in an amount of 30 to 150 parts by mass per 100 parts by mass of said thermoplastic resin, and that can be used as a material for producing a dental prosthetic through the milling work, wherein;
-
6. A process for producing a resin block that contains a thermoplastic resin and inorganic particles, that does not contain any void whose length is not less than 1.0 mm, that has a thick portion of a thickness of at least not less than 5 mm, and that can be used as a material for producing a dental prosthetic through the milling work:
-
by providing a thermoplastic resin composition that contains a thermoplastic resin having a fluidizing temperature in a range of 310 to 500°
C. and at least one kind of inorganic oxide particles selected from the group consisting of silica particles, silica composite particles of silica and other metal oxides, titania particles, and titania composite particles of titania and other metal oxides in an amount of 30 to 150 parts by mass per 100 parts by mass of the thermoplastic resin, and comprising the steps of;injecting and filling a melt of said thermoplastic resin composition in a cavity of an injection-molding machine that has a projection mechanism; exerting a pressure on the thermoplastic resin composition; pushing a projecting member into one side surface of the cavity filled with the thermoplastic resin composition over a contact area of not more than 50% on the basis of the area of the whole one side surface before the thermoplastic resin composition is completely solidified; and taking out the thermoplastic resin composition after it has been cooled down. - View Dependent Claims (7, 9, 10, 11, 12)
-
-
8. A process for producing a resin block that contains a thermoplastic resin and inorganic particles, that does not contain any void whose length is not less than 1.0 mm, that has a thick portion of a thickness of at least not less than 5 mm, and that can be used as a material for producing a dental prosthetic through the milling work:
-
by providing a thermoplastic resin composition that contains a thermoplastic resin having a fluidizing temperature in a range of 310 to 500°
C. and at least one kind of inorganic oxide particles selected from the group consisting of silica particles, silica composite particles of silica and other metal oxides, titania particles, and titania composite particles of titania and other metal oxides in an amount of 30 to 150 parts by mass per 100 parts by mass of the thermoplastic resin, and comprising the steps of;injecting and filling a melt of said thermoplastic resin composition in a cavity of an injection-molding machine that has a projection mechanism; exerting a pressure on the thermoplastic resin composition; pushing a projecting member into one side surface of a compression chamber that has a pushing portion, over a contact area of not more than 50% on the basis of the area of said whole one side surface before the thermoplastic resin composition is completely solidified, the compression chamber having a volume which is 0.2 to 80% the volume of the cavity and, further, having a space continuous to the interior of the cavity; and taking out the thermoplastic resin composition after it has been cooled down.
-
Specification