Process for manufacturing prostetic dental reconstructions

• US 6,106,747 A
• Filed: 11/21/1997
• Issued: 08/22/2000
• Est. Priority Date: 03/28/1995
• Status: Expired due to Fees

• Current Assignee: Arnold Wohlwend
• Original Assignee: Arnold Wohlwend
• Inventors: Wohlwend, Arnold
• Primary Examiner(s): Fiorilla, Christopher A.
• Application Number:
  US08/930,028
• Time in Patent Office: 1,005 Days
• Field of Search: 264/16, 264/17, 264/19, 264/672, 264/673
• US Class Current: 264/16
• CPC Class Codes: A61C 13/0003 Making bridge-work, inlays, implants or the like
• CPC Class Codes: A61C 5/77 Methods or devices for making crowns
• CPC Class Codes: C04B 35/622 Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products

Abstract

A method for producing a dental prosthesis to be fitted to a fitting member including the steps of: determining the three-dimensional contours of the fitting member; producing a three-dimensional form of the dental prosthesis; producing a working stump and/or a working pack; placing the working stump in the form and/or packing the working pack around the outside of the form to completely cover the form; sintering the form with the working stump and/or the working pack; and separating the working stump and/or the working pack from the dental prosthesis after sintering. The working stump and working pack are produced such that they are enlarged by a predetermined enlargement factor.

Claims

1. A method for producing a dental prosthesis to be fitted to a fitting member, the fitting member comprising a corresponding anatomical dental feature within a patient'"'"'s mouth, an abutment, or a corresponding mounting, said method comprising:

determining the three-dimensional contours of the fitting member,

producing a three-dimensional form of the dental prosthesis, enlarged by a predetermined enlargement factor, from a presintered and/or compacted tooth replacement material,

producing

     1) a working stump that is enlarged by said predetermined enlargement factor and which corresponds to a portion of the three-dimensional contours of the fitting member; and

/or

     2) a working pack that is enlarged by the predetermined enlargement factor and which corresponds to a portion of the three-dimensional contour of the outer shape of the form;

said working stump and/or said working pack being produced from a material which has approximately the same shrinkage factor as the tooth replacement material,

placing the working stump in the form and/or packing the working pack around the outside of the form to completely cover the form,

sintering the form with the working stump and/or the working pack, whereby the form is stabilized and becomes said dental prosthesis during said sintering, and

separating the working stump and/or the working pack from the dental prosthesis after said sintering.

2. The method of claim 1, wherein the tooth replacement material and the material used to produce the working stump and/or to produce the working pack is a hard material selected from the group consisting of oxide ceramic, nitride, carbide, and an alloy of an oxide ceramic.

3. The method of claim 2, wherein the hard material is compacted into a green state and/or presintered at a temperature of between 1000 and 1300°

C.

4. The method of claim 2, wherein the material used to produce the working stump and/or to produce the working pack is comprised of compacted and/or presintered oxide ceramic.

5. The method of claim 4, wherein the compacted and/or presintered material used to produce the working stump and/or to produce the working pack is in the form of a powder or shavings.

6. The method of claim 1, further comprising coating the form with a thin layer of a parting compound prior to associating the working stump and/or the working pack therewith.

7. The method of claim 2, wherein the form and the working stump and/or the working pack are sintered at a sintering temperature that is appropriate for the tooth replacement material.

8. The method of claim 1, further comprising providing the form with a veneer after separation of the working stump and/or the working pack therefrom.