WO2020178439A1

WO2020178439A1 - Device for fastening a dental blank to a machine tool

Info

Publication number: WO2020178439A1
Application number: PCT/EP2020/056067
Authority: WO
Inventors: Carsten MARUNDE; André HUTSKY; Andreas Klar
Original assignee: ORGANICAL CAD/CAM GmbH
Priority date: 2019-03-07
Filing date: 2020-03-06
Publication date: 2020-09-10
Also published as: DE202019101288U1; EP3934567A1

Abstract

A device is described with which a blank, provided for the production of at least one dental reconstruction (6), is fastened to a retaining device (2) of a machine tool provided for the machining of the blank (4). According to the invention, a body (10) is provided, having a first portion (10a), which is made of a material that can be machined by the machine tool, with at least one adhesive (12) by which the blank (4) is fixable to the first portion (10a), and having a second portion (10b), which is designed for fastening to the retaining device (2) of the machine tool.

Description

DEVICE FOR FASTENING A DENTAL BLANK TO A MACHINING MACHINE

The invention relates to a device for fastening a blank provided for the production of at least one dental reconstruction to a holding device of a processing machine provided for processing the blank. In the field of dental technology, there are various options for machining ceramic, wax-like, plastic-like or metallic shear blanks or moldings for the production of a tooth restoration, for example the CAD / CAM process or the copy milling process, in which the restoration is made from the molding, for example a tooth crown, an inlay, an onlay or the like is ground out.

The tooth restorations must be made with high accuracy, that is, close manufacturing tolerances. This requires a connection between the Bear processing machine and the molded body to be processed, which the relative Po position between the molded body and the processing machine within closer Holds tolerances in a fixed position during the entire machining process.

It is the object of the invention to provide a device for fastening a blank or shaped body in an associated holder for a shaped body, which light enables maximum use of the shaped body through optional nesting up to the device that can be used for single and multiple use.

This object is achieved with a device for attaching a blank provided for the manufacture of at least one dental reconstruction to a holding device of a processing machine provided for processing the blank, characterized by a body with a first section which consists of one of the processing machine There is machinable material, with at least one adhesive through which the blank can be fixed on the first section cut, and with a second section which is designed for attachment to the holding device of the processing machine.

The body according to the invention forms a shaped body in the manner of an adapter for fastening a blank to a holding device of a processing machine provided for processing the blank. While the second section of the body is designed for its attachment to the holding device of the processing machine, the first section of the body is attached to the blank using an adhesive, so that the first section of the body carries the blank. Accordingly, the blank for its processing by the processing machine is to be mounted on the holding device of the processing machine via the body according to the invention. Thus, when the blank is attached to the body according to the invention, the first section of the body forms the section of the body immediately adjacent to the blank. Since this first section of the body according to the invention consists of a material that can be processed by the processing machine and can thus be processed by the processing machine in the same way as the blank, it is possible for the first time with the aid of the invention to also perform dental reconstructions from the blank in its adjacent subregions closest to the holding device and thus being able to fully use the surface of the blank for the production of dental reconstructions - which was not possible in the prior art with the blank clamped directly in the holding device. Accordingly, the invention enables maximum utilization of the blank, and in particular a conventional blank, in a simple and at the same time skilful manner, without the production of dental reconstructions from the blank by the holding device of the processing machine being spatially restricted and a structural adaptation or modification of the blank being required becomes.

Preferred embodiments and developments of the invention are specified in the dependent claims.

For example, an adhesive should expediently be used as the adhesive.

The first section of the body preferably has a fixing surface which is provided with the adhesive at least in sections, preferably completely, wherein the fixing surface can preferably have an elongated shape.

Another preferred embodiment is characterized in that the Vorrich device is provided for fastening a plate or disk-shaped and a circumferential narrow side or a circumferential edge having blank and the first portion of the body is formed that the narrow side or the edge of the The blank can be fixed at least in sections on the first section.

In a preferred development of this embodiment, the fixing surface has a complementary shape in relation to the narrow side or the edge of the blank, with only that portion of the narrow side or the edge of the blank that comes into contact with the fixing surface on the body being relevant in this regard, and where it is basically sufficient that the complementary shape forms an essentially complementary shape. An additional development of the aforementioned embodiment is characterized in that the device is provided for fastening a blank, the narrow side or edge of which has a projection at least in sections, and the first section of the body at least in sections contains a groove which is used to receive at least one Section of the projection provided on the narrow side or the edge of the blank is formed and is at least partially provided with the adhesive. The groove can preferably have a shape that is complementary to the projection, only that portion of the projection on the blank that engages in the groove is relevant, and it is basically sufficient that the complementary shape forms an essentially complementary shape.

In an additional development of the previously specified embodiment, a section of the fixing surface of the first section of the body is formed by the groove, the groove preferably being able to extend in the longitudinal direction of the fixing surface and in particular essentially over the entire length of the fixing surface in order to ensure particularly reliable fastening of the blank on the body.

Furthermore, the body can preferably have a third section which is provided as a reference means for a precise arrangement of the body relative to the processing machine. In a further development of this embodiment, the third section of the body can be used as a stop for a contacting system on a corresponding section of the processing machine, said section also being able to form a section of the holding device. Furthermore, the third section provided as a stop can also be arranged as a separate element on the body.

Appropriately, the body can consist of a material that can be processed by the processing machine, not only with its first section, but also as a whole, which can enable the body to be produced more easily. It is also expedient for the second section of the body, which is adjacent to the holding device, to be designed for a substantially non-positive clamping in the holding device of the processing machine.

Finally, the first section is preferably formed on one side of the body and the second section is formed on a side of the body which is opposite with respect to the first section and which is remote from the first section.

For the sake of completeness, it should be noted that the invention is also suitable for blanks that are intended not only for the production of dental reconstructions, but also, for example, for the production of autogenous, allogeneic and alloplastic bone replacement materials or combinations thereof.

A preferred embodiment of the invention is explained in more detail below with reference to the accompanying drawings. Show it:

1 shows a plan view of an arrangement according to the prior art; Fig. 2 is a perspective view of a preferred embodiment of the inventive arrangement;

3 shows the embodiment of FIG. 2 in plan view; and FIG. 4 shows the embodiment of FIG. 2 in cross section.

In FIG. 1, a conventional arrangement is shown as it has been used many times up to now. A holding device 2 is shown schematically with the reference number “2”, as it is used in processing machines for the production of dental reconstructions from blanks. The reference number “4” shows a blank that is also used in many ways. In the example shown, the blank 4 has the shape of an essentially circular disk and can be machined, for example, from plastic, metal or another Material that is suitable and preferably millable for the dental medicine-specific reconstructions to be produced from the blank 4. With the reference character "6", dental reconstructions are shown outlined by way of example, which are worked out from the blank 4, in particular by milling. The dental reconstructions are, for example, bridges or crowns. For processing by a processing tool of a processing machine not shown in the figure, the blank 4 is taken with its edge 4a fastened to an adjacent edge section 2a of the holding device 2. It is usually fastened by clamping. For this purpose, through bores 8 are formed in the holding device 2, which receive screws, not shown. These screws are in screw engagement with a clamping jaw which is arranged on the underside of the holding device 2, which cannot be seen in FIG. 1. The blank 4 can then be clamped with its edge 4a between the holding device 2 and the clamping jaw (not shown), which also complements the holding device 2.

However, in order to avoid the risk of damage to the holding device 2 by the machining tool processing the blank 4, which is also not shown in FIG. 1, a so-called non-machinable protective area is to be defined for the blank 4 adjacent to the holding device 2, which area runs along ei - Nes corresponding portion of the edge 4a of the blank 4 is to be provided adjacent to this. Due to the formation of this non-machinable protection area, however, the machinable area of the blank 4 and thus the degree of utilization of the blank 4 is noticeably restricted.

FIGS. 2 to 4 now show a preferred exemplary embodiment of the invention with which the aforementioned problem is solved.

In the following description of the exemplary embodiment shown in FIGS. 2 to 4, the same components and elements are identified with the same reference numerals as in FIG. 1 and, in order to avoid repetitions, essentially only refer to the differences from that shown in FIG referenced conventional arrangement. As can be seen in FIGS. 2 to 4, a body 10 is fastened along the section of the edge 4a of the blank 4 adjacent to the holding device 2, with which the blank 4 is in turn to be fastened to the holding device 2. The body 10 is provided as an adapter, with which the blank 4 is fastened to the corresponding edge section 2a of the holding device 2, the body being referred to below as an adapter. Accordingly, the adapter 10 is located between the blank 4 and the holding device 2 and thus holds the blank 4 at a greater distance from the holding device 2.

In the illustrated embodiment, the edge 4a of the blank 4 is provided with a projection 4aa which ends at a distance from both sides or Oberflä surfaces of the blank 4, so that the edge 4a between the projection 4aa and the adjacent surface of the blank 4 has an undercut or from paragraph 4ab. The edge 4a of the blank 4 is attached to an adjacent first section 10a of the adapter 10, for which in the illustrated embodiment the edge of the first section 10a of the adapter 10 adjacent to the edge 4a of the blank 4 is provided with a groove 10aa, in which the 4aa of the edge 4a of the blank 4 engages. As can be seen from FIG. 4, the groove 10aa of the first section 10a of the adapter 10 has a cross-sectional shape that is at least essentially complementary to the projection 4aa of the edge 4a of the blank 4. As FIGS. 2 and 3 also show, the first section 10a with its edge adjacent to the edge 4a of the blank 4 follows the curvature of the edge 4a of the blank 4, which also applies to the groove 10aa in the first section 10a of the adapter 10 applies.

As FIG. 4 further shows, the gap formed between the projection 4aa of the edge 4a of the blank 4 and the groove 10aa in the first section 10a of the adapter 10 is filled by an adhesive 12, whereby a non-positive, fixed connection between the adapter 10 and the blank 4 is produced. The adhesive 12 is attached to the edge of the first section 10a of the adapter 10 and in particular in its groove 10aa. Alternatively, however, it is also conceivable to use an adhesive as an independent, separate element. Thus forms the groove 10aa in the first section 10a of the adapter 10 is a fixing surface for fastening the adjacent section of the edge 4a of the blank 4. Adhesive is preferably used as the adhesive 12.

To fasten the adapter 10 with the blank 4 fixed thereon to the holding device 2, the adapter 10 has a second section 10b, which is located on a side of the adapter 10 that is opposite to the first section 10a and remote from the first section 10a is trained. The attachment of the adapter 10 to the blank 4 in the region of the second section 10b of the adapter 10 on the adjacent edge section 2a of the holding device 2 takes place in the embodiment according to FIGS. 2 to 4 in a manner similar to the prior art by clamping. 4 shows the clamping jaw to be arranged on the underside of the holding device 2 with the reference number "14", which is provided with several threaded bores 16, of which each threaded bore 16 in the clamping jaw 14 leads to a corresponding through-hole 8 in the holding device 2 is aligned and aligned with it. In order to lock the clamping jaw 14 on the holding device 2 and thereby bring the adapter 10 into clamping engagement with its second section 10b, clamping screws, not shown in the figures, are provided, which are inserted through the through holes 8 in the holding device 2 and are in screw engagement with the Corresponding threaded hole 16 are brought. In addition, it should be noted that in the illustrated embodiment, the edge of the clamping jaw 14 adjacent to the adapter 10 also has a correspondingly curved course or a correspondingly curved shape in adaptation to the curvature of the edge 4a of the blank 4. As can also be seen in FIGS. 2 and 3, the adapter 10 also has a third section 10c, which is attached to one of the two ends of the adapter 10 (in the perspective of FIG. 2 the end facing the viewer or in the view of FIG . 3 the lower end) is arranged. This third section 10c is provided as a stop for contacting an adjacent section 2b of the holding device 2 and thus serves as a reference means for a precise arrangement of the adapter 10 relative to the holding device 2 and thus relative to the processing tool not shown in the figures illustrated processing machine, to which the holding device 2 belongs. This third section 10c can optionally be designed in one piece with the rest of the adapter 10 or as a separate element.

The adapter 10 is made of a machinable material at least in the area of its first section 10a, but preferably overall similar to the blank 4, the material of the adapter 10 not necessarily being identical to the material of the blank. Rather, it is crucial that the adapter 10 consists of a material which, in the same way as with the blank 4, enables engagement by a processing tool of a processing machine, not shown in the figures, of which the holding device 2 is part. In this respect, a more cost-effective material can preferably be used for the adapter 10, as long as it can be processed by the processing machine. Such a material can, for example, be inexpensive plastic, not least because the adapter 10 is generally disposed of after the machining of the blank 4 has ended. The use of the previously described adapter 10 made of machinable material has the advantage that dental reconstructions 6, such as bridges or crowns, are also milled out or milled out of the blank 4 in its edge area adjacent to the holding device 2 and thus also there up to its edge 4a can be. The adapter 10 is also affected in its first section 10a, as exemplified by the points marked "I" and "II" at the two ends of the adapter 10, where part of the adapter 10 has been removed or milled by machining is. What is decisive here, however, is that despite the improved utilization and thus yield of the blank 4 for the holding device 2, there is no risk of damage by the machining tool and the holding device 2 is thus protected by the adapter 10, so to speak. The arrangement described above with reference to FIGS. 2 to 4, according to a preferred exemplary embodiment of the invention, allows the use of conventional blanks, so that an adaptation on the part of the blanks is not necessary. Finally, for the sake of completeness, it should be noted at this point that the arrangement shown in FIGS. 2 to 4 is for example also suitable for blanks that are intended for the production of autogenous, allogeneic and alloplastic bone substitute materials or combinations thereof.

Claims

Expectations

1. Device for attaching a blank (4) provided for the production of at least one dental reconstruction (6) to a holding device (2) of one provided for processing the blank (4)

Processing machine,

characterized by a body (10) with a first section (10a) which consists of a material that can be machined by the processing machine, with at least one adhesive (12) by which the blank (4) can be fixed to the first section (10a), and with a second section (10b) which is designed for attachment to the holding device (2) of the processing machine.

2. Device according to claim 1, characterized in that the adhesive (12) comprises an adhesive.

3. Device according to claim 1 or 2, characterized in that the first section (10a) has a fixing surface which is provided at least in sections with the adhesive (12).

4. The device according to claim 3, characterized in that essentially the entire fixing surface is provided with the adhesive (12).

5. Apparatus according to claim 3 or 4, characterized in that the Fi xierfläche has an elongated shape.

6. The device according to at least one of the preceding claims, characterized in that the device is provided for fastening a plate or disk-shaped blank (4) having a circumferential narrow side or a circumferential edge (4a) and the first section (10a) is formed is that the narrow side or the edge (4a) of the blank (4) can be fixed at least in sections to the first section (10a) by means of the adhesive (12).

7. Device according to claims 3 and 6, characterized in that the fixing surface (10aa, 10ab) has a complementary shape with respect to the narrow side or the edge (4a) of the blank (4).

8. The device according to claim 6 or 7, characterized in that the device for fastening a blank (4) is provided, the narrow side or edge (4a) at least in sections has a projection (4aa), and the first section (10a) ) at least partially contains a groove which is designed to receive at least a section of the projection (4a) provided on the narrow side or the edge (4a) of the blank (4) and at least partially provided with the adhesive (12).

9. The device according to claim 8, characterized in that the groove (10aa) has a shape complementary to the projection (4aa).

10. The device according to claim 3 and claim 8 or 9, characterized in that a section of the fixing surface of the first section (10a) is formed by the groove (10aa).

11. The device according to claim 5 and 10, characterized in that the groove (10aa) extends in the longitudinal direction of the fixing surface.

12. The device according to claim 11, characterized in that the groove (10aa) extends essentially over the entire length of the fixing surface.

13. The device according to at least one of the preceding claims, characterized in that the body (10) has a third section (10c) which is provided as a reference means for a precise arrangement of the body (10) relative to the processing machine.

14. The device according to claim 13, characterized in that the third section (10c) is provided as a stop for a contacting system on a corresponding section (2b) of the processing machine.

15. Device according to at least one of the preceding claims, characterized in that the body (10) consists of a material that can be processed by the processing machine.

16. The device according to at least one of the preceding claims, characterized in that the second section is designed for a substantially non-positive clamping in the holding device of the processing machine.

17. The device according to at least one of the preceding claims, characterized in that the first section (10a) on one side of the body (10) and the second section (10b) on one with respect to the first

Section (10a) opposite and from the first section (10a) remote side of the body (10) is formed.