Translucent veneering for a dental prosthesis formed by a press to metal process

Patent metadata

Field	Value
Publication number	US-10603144-B2
Application number	US-201414338442-A
Country	US
Kind code	B2
Filing date	Jul 23, 2014
Priority date	Nov 19, 2004
Publication date	Mar 31, 2020
Grant date	Mar 31, 2020

Abstract

A dental prosthesis, typically formed in a press to metal process, includes application of a porcelain composition sufficient to form a veneer on a dental prosthesis supporting metal structure, the composition having an integrated tooth-like translucency providing an aesthetic appearance. The composition is formed of a dentin frit and an enamel frit, typically sintered into a desired ingot shape including an amount of composition sufficient to veneer the prosthesis. The porcelain composition is a component of a kit that includes opaquers, other porcelains and stains useful in finishing to provide an aesthetic prosthesis.

First claim

What is claimed is:

1. Method of making a porcelain veneered dental prosthesis comprising the steps of:
providing a substructure for supporting and fitting a dental prosthesis onto tooth surfaces;
forming an opaquing ceramic mixture, wherein the opaquing ceramic mixture in powder form has the following total composition of 100 wt. %:
53-56 wt % of SiO2,
10-14 wt % of Al2O3,
3-5 wt % of Na2O,
8-11 wt % of K2O,
0-2 wt % of Li20,
0-2 wt % of CaO,
0-1 wt % of BaO,
0-1.5 wt % of CeO2, and
0-3 wt % of Tb4O7,
which is obtainable by mixing:
(i) 40 to 60% by weight a first frit material, the first frit material being formed from a composition that includes a plurality of oxides;
(ii) 20 to 45% by weight a second frit material, the second frit material being formed from a composition that includes a plurality of oxides, and
(iii) 12-17 wt % ZrO2;

wherein the composition that forms the second frit material is different from the composition that forms the first frit material;
coating the substructure with the opaquing ceramic mixture; and
firing the substructure with the opaquing ceramic mixture to form an opaque layer fused to the substructure.

2. The method of claim 1 , further comprising the step of providing in a hot press furnace for injecting a ceramic porcelain material into an investment mold.

3. The method of claim 1 , further comprising the step of investing the dental substructure in a mold forming an adjacent cavity for receiving a veneer to be fused to the opaque layer of the substructure.

4. The method of claim 3 , further comprising the step of injecting, under heat and pressure, into the veneer cavity a porcelain ceramic having an integrated tooth-like translucency wherein the porcelain ceramic forms a translucent layer that is fused to the opaque layer of the supporting structure or coping, thereby forming a finished prosthesis having a tooth-like appearance.

5. The method of claim 1 , wherein the substructure is a metal supporting structure or coping.

6. The method of claim 1 , wherein at least one of the composition of the first frit material and the second frit material further includes ZrO2.

7. The method of claim 4 , further comprising the step of forming the porcelain ceramic by blending dentin and enamel frit materials, in ratios of 70:30 to 85:15 percent by weight, respectively.

8. The method of claim 1 , wherein the opaque layer is in powder form or in paste form.

9. The method of claim 1 , wherein composition of the second frit material includes at least two of the following components:
CaO,
BaO,
CeO 2 , and
Tb 4 O 7 .

10. The method of claim 1 , wherein the composition of the second frit material includes at least two of the following components:
CaO,
BaO,
CeO 2 , and
Sb 2 O 3 .

11. The method of claim 4 , wherein the porcelain ceramic includes Sb 2 O 3 .

12. The method of claim 1 , wherein the opaquing ceramic is applied by hand application using a spatula and/or a brush, spraying, a slurry dip or electrodeposit.

13. The method of claim 7 , wherein the blend of the dentin frit material and the enamel frit material includes:
70 to 85% by weight the dentin frit material; and
15 to 30% by weight the enamel frit material, the enamel frit material being different than the dentin frit.

Assignees

• Dentsply Sirona Inc

Inventors

• Chu Christopher C Y
• Banasiak Slawomir

Classifications

• A61K6/836

  Glass · CPC title

• A61C13/09

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

• A61C13/0835 Primary

  Ceramic coating on metallic body · CPC title

• A61K6/818

  comprising zirconium oxide · CPC title

• A61C13/082

  Cosmetic aspects, e.g. inlays; Determination of the colour (A61C19/10 takes precedence) · CPC title