PRODUCTION METHOD FOR TOOTH REPLACEMENT PART AND VENEER STRUCTURE

• US 20180200029A1
• Filed: 07/06/2016
• Published: 07/19/2018
• Est. Priority Date: 07/06/2015
• Status: Active Grant

• Current Assignee: Dentsply Sirona INC. (Astrazeneca PLC)
• Original Assignee: Dentsply Sirona INC. (Astrazeneca PLC)
• Inventors: SCHNITZSPAN, Paul, THORSTEN, Jordan, ROSSLER, Friedemann
• Granted Patent: US 11,337,781 B2
• Time in Patent Office: Days
• CPC Class Codes: A61C 13/34 Making or working of models, e.g. preliminary castings, trial dentures; Dowel pins [4]
• CPC Class Codes: A61C 5/70 Tooth crowns; Making thereof
• CPC Class Codes: A61C 8/0039 in the form of hollow cylinder with an open bottom
• CPC Class Codes: A61C 8/0048 Connecting the upper structure to the implant, e.g. bridging bars A61C8/0028 takes precedence
• CPC Class Codes: G16H 20/40 relating to mechanical, radiation or invasive therapies, e.g. surgery, laser therapy, dialysis or acupuncture

Abstract

The invention relates to a method for producing a tooth replacement part to be secured on an implant, based on a 3D model of the tooth replacement part (1) with a surface (2) and with a continuous screw channel (3) with an initial shape (4) in the form of a cylindrical barrel, with a first and a second end (5, 6), wherein a cross sectional area (7) of the screw channel (3) is designed to be constant and/or to increase in size towards the second end (6) of the screw channel (3); and a 3D model of an inlay (9) with a jacket surface (10), an upper face (11) and a lower face (12) is generated, wherein a part of the surface (2) of the 3D model of the tooth replacement part (1) that is cut out through the second end (6) of the final shape (8) of the screw channel (3) is used as the upper face (11); and the jacket surface (10) is configured as a negative form of a part of the final shape (8) of the screw channel (3) that adjoins the second end (6).

Claims

1. A method for producing a tooth replacement part to be secured on an implant, based on a 3D model of the tooth replacement part with a surface, comprising the steps of:

providing in the 3D model of the tooth replacement part, a continuous screw channel for a fixing screw with an initial shape in the form of a cylindrical barrel, with a first implant-sided end (5) and with a second occlusal or incisal-sided end is generated automatically and/or manually,

designing a cross sectional area of the screw channel to be constant and/or to increase in size towards the second end of the screw channel, wherein the resulting shape is stored as the final shape of the screw channel; and

generating a 3D model of an inlay with a jacket surface, an upper face and a lower face, wherein a part of the surface of the 3D model of the tooth replacement part that is cut out through the second end of the final shape of the screw channel is used as the upper face, wherein the jacket surface is configured as a negative form of a part of the final shape of the screw channel that adjoins the second end.

2. The method, as claimed in claim 1, wherein in order to design the increase in size of the screw channel on the surface of the 3D model of the tooth replacement part, a line, which encloses the cylindrical initial shape of the screw channel in the circumferential direction, is generated manually and/or automatically;

that a slope or a length of the increase in size is specified automatically and/or manually; and

that the final shape of the screw channel is designed with the specified slope or to increase in size beyond the specified length up to the line.

3. The method, as claimed in claim 1, wherein the jacket surface of the 3D model of the inlay is moved automatically and/or manually at least partially in the direction of a longitudinal axis of the 3D model of the inlay.

4. The method, as claimed in claim 1, wherein the cross sectional area of the screw channel in the region of the increase in size is configured with a non-rotationally symmetrical shape that is unique in the circumferential direction, in order to secure against rotation.

5. A veneer structure for the reconstruction of a dental defect, said veneer structure comprising:

a tooth replacement part with a continuous screw channel for a fixing screw, wherein the screw channel at least in a region adjoining an incisal or occlusal second end of the screw channel has a constant and/or increasing cross sectional area towards the incisal, occlusal or oral region; and

an inlay with an upper face, a lower face and a jacket surface, wherein the jacket surface corresponds to a negative form of a part of the screw channel that adjoins the incisal, occlusal or oral surface; and

the upper face represents a continuation of the incisal, occlusal or oral surface in the region of the screw channel.

6. The veneer structure as in claim 5, wherein the screw channel in the region, adjoining the second end, has a shape in the circumferential direction that provides an orientation between the tooth replacement part and the inlay that corresponds in the circumferential direction.