# US 10,945,927 B2 · Phosphate-based dental investment material

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- Number: US 10,945,927 B2
- Document ID: US10945927B2
- Status: Granted
- Kind: B2
- Application number: 15/981,980
- Filed: 2018-05-17
- Published: 2018-11-22
- Granted: 2021-03-16
- Earliest claimed: 2017-05-17
- Assignees: Shofu Inc.
- Applicants: Shofu Inc.
- Inventors: Toshio Kitamura; Masahiro Kazama
- Web page: https://patentgrep.com/patent/US10945927B2

## CPC

- A61K 6/838: Phosphorus compounds, e.g. apatite
- A61C 13/20: Methods or devices for soldering, casting, moulding or melting {(A61C13/04, A61C13/081 take precedence)}
- A61K 6/807: comprising magnesium oxide
- A61K 6/827: Leucite
- A61K 6/871: Quartz; SiO2
- A61K: PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES (devices or methods specially adapted for bringing pharmaceutical products into particular physical or administering forms A61J3/00; chemical aspects of, or use of materials for deodorisation of air, for disinfection or sterilisation, or for bandages, dressings, absorbent pads or surgical articles A61L; soap compositions C11D)
- A61C: DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE (non-driven toothbrushes A46B; {tongue scrapers A61B17/24;} preparations for dentistry A61K6/00; preparations for cleaning the teeth or mouth A61K8/00, A61Q11/00)

## Abstract

To provide a phosphate-based dental investment material which can used for metal and press ceramic and especially can impart the lubricity to the surface of a press ceramic, and a phosphate-based dental investment material which can be subjected to a flash heating for press ceramic, can obtain sufficient the hardening expansion, and can easily remove the investment material after press molding. A phosphate-based dental investment material of the present disclosure comprising a powder material and a liquid material, wherein the powder material contains (a) magnesium oxide: 5 to 20 wt. %; (b) ammonium dihydrogenphosphate: 8 to 25 wt. % and the liquid material contains (c) aqueous solution including a cation-treated colloidal silica.

## Claims

### Claim 1

A phosphate-based dental investment material comprising a powder material and a liquid material, wherein
the powder material contains
(a) magnesium oxide: 5 to 20 wt. %;
(b) ammonium dihydrogenphosphate: 8 to 25 wt. % and
the liquid material contains
(c) aqueous solution including a cation-treated colloidal silica,
wherein the cation-treated colloidal silica is colloidal silica surface-treated with a cationic silane coupling material or a cationic metal element.

### Claim 2 (depends on 1)

The phosphate-based dental investment material according to claim 1, wherein the content of alkali metals (in terms of oxide) in the (c) aqueous solution including cation-treated colloidal silica is in a range of 0.001 to 0.30 wt. %.

### Claim 3 (depends on 1)

The phosphate-based dental investment material according to claim 1, wherein the pH of the (c) aqueous solution including cation-treated colloidal silica is in a range of 8.0 to 10.0.

### Claim 4

A phosphate-based dental investment material comprising a powder material and a liquid material, wherein
the powder material contains
(a) magnesium oxide: 5 to 20 wt.%;
(b) ammonium dihydrogenphosphate: 8 to 25 wt.% and the liquid material contains
(c) aqueous solution including a cation-treated colloidal silica,
wherein the cation-treatment is alumina compound treatment.

### Claim 5 (depends on 2)

The phosphate-based dental investment material according to claim 2, wherein the pH of the (c) aqueous solution including cation-treated colloidal silica is in a range of 8.0 to 10.0.

### Claim 6

A phosphate-based dental investment material comprising a powder material and a liquid material, wherein
the powder material contains
(a) magnesium oxide: 5 to 20 wt.%;
(b) ammonium dihydrogenphosphate: 8 to 25 wt.% and
the liquid material contains
(c) aqueous solution including a cation-treated colloidal silica,
wherein the content of alkali metals (in terms of oxide) in the (c) aqueous solution including cation-treated colloidal silica is in a range of 0.001 to 0.30 wt.%, and
wherein the cation-treatment is alumina compound treatment.

### Claim 7

A phosphate-based dental investment material comprising a powder material and a liquid material, wherein
the powder material contains
(a) magnesium oxide: 5 to 50 wt.%;
(b) ammonium dihydrogenphosphate: 8 to 25 wt.% and
the liquid material contains
(c) aqueous solution including a cation-treated colloidal silica,
wherein the pH of the (c) aqueous solution including cation-treated colloidal silica is in a range of 8.0 to 10.0, and
wherein the cation-treatment is alumina compound treatment.