Method for producing a high-strength ceramic dental prosthesis

• US 7,162,321 B2
• Filed: 12/07/2000
• Issued: 01/09/2007
• Est. Priority Date: 12/07/1999
• Status: Expired due to Fees

• Current Assignee: Ce.Novation GmbH
• Original Assignee: Inocermic Gesellschaft Fuer Innovative Keramik MbH, Ralph Gunnar Luthardt
• Inventors: Johannes, Martina, Luthardt, Ralph Gunnar, Sandkuhl, Olaf, Herold, Volker
• Primary Examiner(s): Manahan; Todd E.
• Application Number:
  US10/149,054
• Publication Number:
  US 20030096214A1
• Time in Patent Office: 2,224 Days
• Field of Search: 433/201.1, 433/202.1, 433/212.1, 264/19, 264/20, 249/54, 493/223, 700/118
• US Class Current: 700/118
• CPC Class Codes: A61C 13/0003 Making bridge-work, inlays, implants or the like
• CPC Class Codes: A61C 13/0004 Computer-assisted sizing or machining of dental prostheses
• CPC Class Codes: A61C 13/20 Methods or devices for soldering, casting, moulding or melting A61C13/04, A61C13/081 take precedence
• CPC Class Codes: A61C 5/77 Methods or devices for making crowns
• CPC Class Codes: A61C 9/0046 Data acquisition means or methods
• CPC Class Codes: A61K 6/17 Particle size
• CPC Class Codes: A61K 6/20 Protective coatings for natural or artificial teeth, e.g. sealings, dye coatings or varnish
• CPC Class Codes: A61K 6/807 comprising magnesium oxide
• CPC Class Codes: A61K 6/818 comprising zirconium oxide
• CPC Class Codes: G16H 20/40 relating to mechanical, radiation or invasive therapies, e.g. surgery, laser therapy, dialysis or acupuncture

Abstract

Tooth restorations are produced starting from data preferably obtained by optical or mechanical digitizing of prepared teeth and/or teeth of one jaw or of both jaws, intraorally, or from jaw models or partial models of one jaw or of both jaws, extraorally, a subsequent CAD construction of aforementioned restorations being produced in the way that an outer mold, in opposition to the oral cavity is constructed by the primary shaping of the tooth restoration, consisting throughout of high strength ceramic material, taking into account sinter shrinkage.

Claims

1. Method for producing high strength ceramic dental restorations including inlays, onlays, partial crowns, crowns, FPDs and superstructures for implant retained prosthesis, that can be fitted onto at least one prepared surface of a tooth stump or artificial abutment, said restoration having an internal geometry determined by a border surface occurring between said prepared surface and said restoration, and an external geometry, said method comprising making data available to define said internal geometry by means of digitization of the prepared surface and using said data to form the inner shape of said restoration and

using digitization to obtain data defining a negative form of neighboring and antagonistic teeth and masticatory faces of said restoration as said external geometry, and using said latter data to construct a mold, and utilizing said mold to form the outer shape of said restoration,

said method steps resulting in the forming of said dental restoration consisting throughout of said high strength ceramic for its final shape.

2. Method as claimed in claim 1, further comprising producing a reproduction of physiological natural masticatory faces having respective depth of fissures and fissure radii by slip casting in a primary shaping procedure.

3. Method as claimed in claim 1 or 2, wherein the outer shape of the restoration is reduced by an amount corresponding to a subsequent ceramic veneering.

4. Method as claimed in claim 1 or 2, wherein the high strength ceramic material is differently colored by means of dopants to simulate coloring of a natural tooth.

5. Method as claimed in claim 1 or 2, wherein the high strength ceramic material is transparent.

6. Method as claimed in claim 1 or 2, wherein in the course of primary shaping the ceramic dental restoration is given, taking into consideration the layer thickness of dental bonding material, a final inner shape in opposition to the jaw and to the prepared surface, respectively, said final inner shape being obtained by an impression.

7. Method as claimed in claim 1 or 2, wherein shaping of the inner shape is carried out by machining the ceramic as a green body, a brown body or in the sintered state.

8. Method as claimed in claim 1, wherein the primary shaping is carried out by ceramic injection molding.

9. Method as claimed in claim 1 including the step of using said data to form the inner shape of said restoration in the construction of said mold and subsequently utilizing the mold for the primary shaping of the restoration including both its inner and outer shapes.