WO2017005905A1

WO2017005905A1 - Device and method for holding prosthetic teeth

Info

Publication number: WO2017005905A1
Application number: PCT/EP2016/066290
Authority: WO
Inventors: Tim WEITZEL; Yohannes Woldegergis
Original assignee: Heraeus Kulzer Gmbh
Priority date: 2015-07-08
Filing date: 2016-07-08
Publication date: 2017-01-12
Also published as: DE102015111048A1; DE102015111048B4

Abstract

The invention relates to a method for fixing prefabricated prosthetic teeth (2), and preferably also for machining prefabricated prosthetic teeth (2), said method having the following method steps: several prefabricated prosthetic teeth (2) are positioned and brought into contact with at least one shrink film (1), the at least one shrink film (1) is then shrunk and thereby fixes the prosthetic teeth (2) in their position and orientation to each other. The invention also relates to a kit for machining several prosthetic teeth (2), said kit having a plurality of prosthetic teeth (2) which are fixed in their position and orientation relative to each other by at least one shrink film (1).

Description

"Device and method for holding prosthetic teeth" Description

The invention relates to a method for the fixation of prefabricated prosthetic teeth, and preferably also for the processing of prefabricated prosthetic teeth.

The invention also relates to a set comprising a plurality of prosthetic teeth.

The invention thus relates to the manufacture and provision of prefabricated denture teeth for further processing for partial and total dental plastic prostheses, which are produced by machine in the CAM method (CAM - Computer-Aided Manufacturing) and which are computer-aided with CAD- Process (CAD - Computer - Aided Design). The denture teeth can be provided as a semi-finished product for the partial or complete production of dental plastic prostheses with CAM method. The currently common way is the analogous creation of prosthetic teeth. The denture teeth are placed manually and individually on a wax base. This wax prosthesis is embedded in a cuvette with plaster in the next step, and then wash out the wax base with hot water after curing of the gypsum and to create a cavity for the denture plastic. The prosthetic teeth remain in the plaster. A corresponding gypsum is injected into the cavity or "stuffed" and you get after curing of the plastic prosthesis or the finished prosthetic tooth.

When setting up prefabricated denture teeth, they are adapted and ground by the dental technician for the respective oral situation of the patient. There are already first methods, such as the methods known from DE 10 2009 056 752 A1 or WO 2013 124 452 A1, in which the partial or total prosthesis is set up digitally and produced via CAD-CAM methods.

The disadvantage of this is the positioning of the prosthetic teeth in a prosthesis base plate. As a rule, a tailor-made trough is prefabricated in a prosthesis base plate in order to then glue in the prefabricated denture teeth. This only works if there is enough space. In In most cases, the prosthetic tooth must be ground for reasons of space. Pre-fabricated prosthetic teeth are usually at least to be worked from basal in the preparation of prosthetic work. In the case of manual conversion, processing takes place individually per denture tooth by the processor. In this case, however, it no longer fits into the pre-produced cavity in the denture baseplate.

DE 10 201 1 101 678 A1 proposes that the crown region of a denture tooth is embedded in a carrier layer and that the denture tooth is subsequently processed. This attachment of the prosthetic teeth is done either by wax or other meltable or curable masses. This achieves a firm and precise connection with simultaneously defined positioning of the denture teeth. The disadvantage of this is that the prosthetic tooth must be partially exposed through partially thick layers of material through to edit the embedded crown area. In addition, after processing, the remainder of the material used for embedding must be removed from the reworked denture teeth before they can be used to make a dental prosthesis. The disadvantages of the method are also in the complex production of the body. These are to be manufactured singly or in groups by inserting the finished denture teeth into a holder, placing an outer frame and finally pouring with a bonding medium (eg wax). As a result, the pouring of the prosthetic teeth with the carrier layer forming mass is technically complex.

The carrier layer must cure before the denture tooth can be processed, since significant forces occur in particular when using automated CAM milling. The position accuracy of the method also suffers from possible deformations of the not yet fully cured carrier layer, so that in extreme cases, the reworked prosthetic tooth is not milled exactly enough and therefore must be disposed of. Furthermore, such a carrier layer can usually only be completely removed from the prosthetic tooth again with a certain expenditure. After use, the remains of the removed backing must be disposed of.

The object of the invention is therefore to overcome the disadvantages of the prior art. In particular, a method and a set of denture teeth is to be provided, with the simplest possible, complete and inexpensive processing of denture teeth is possible. As few finishing steps as possible should be necessary. As many necessary parts as possible should be reusable to allow serial processing. Furthermore, a cleaning of the ground prosthetic teeth should be reduced or avoided as much as possible. The method should be as cost effective and quickly implemented and the set to be produced as inexpensively. In addition, the milling or reworking of the prosthetic teeth should be possible as quickly and inexpensively. Furthermore, modern computer-controlled manufacturing processes with the method and the set to be implemented and the greatest possible automation can be achieved.

The objects of the invention are achieved by a method for the fixation of prefabricated prosthetic teeth, and preferably also for the processing, of prefabricated prosthetic teeth, comprising the following method steps:

A) several prefabricated denture teeth are positioned and brought into contact with at least one shrink film,

B) the at least one shrink film is then shrunk and thereby fixes the prosthetic teeth in their position and orientation to each other.

It can preferably be provided that the prefabricated prosthetic teeth are positioned in a predetermined position and / or orientation relative to each other and are brought into contact with the at least one shrink film. Preferably, the film is thermally shrunk. Furthermore, it may be preferable to heat the shrink film before it is brought into contact with the denture teeth. The denture teeth are fixed. Polyethylene films are preferably used as shrink films. Alternatively, polyolefin films may also be used.

In the method according to the invention, provision may also be made for the denture teeth to be inserted into a template or a negative mold such that at least the basal or coronal ends protrude from the template or the negative mold, the denture teeth being in their position and orientation through the template or the negative mold be set to each other and wherein the at least one shrink film is placed at least on the basal or coronal ends of the denture teeth before the prosthetic teeth with the at least one shrink film are fixed, wherein preferably the basal and the coronal ends protrude from the template.

In this way, the positioning of the prosthetic teeth to each other can be achieved in a simple and easy to be carried out with the template or the negative mold. With a suitable shape of the template or the negative mold, it can be fixed together with the denture teeth in the at least one shrink film for stable fixation of the denture teeth. The template and the negative mold can also be multi-part.

Preferably, it can also be provided that the template or the negative mold consists of a non-plastically deformable material, preferably of a material having a modulus of elasticity of at least 0.2 GPa, more preferably from 0.2 GPa to 6 GPa. The material in this case is preferably a plastic. With such materials having these moduli of elasticity, a resilient force can be applied to the denture teeth without the template or negative mold penetrating the denture teeth and damaging them.

With a further development according to the invention, it is also proposed that the at least one shrink film is heated, around which the denture teeth inserted into the template or the negative mold are placed, and then the at least one shrink film is shrunk onto the denture teeth with a pressure difference and the denture teeth in the prosthesis teeth Stencil or negative mold fixed.

This achieves a particularly stable all-round fixation of the prosthetic teeth. The thus fixed prosthetic teeth can then easily withstand the mechanical stresses during milling of the denture teeth, without being moved or twisted unintentionally. The pressure differential can be created by applying a vacuum on one side which sucks the shrink film onto the denture teeth and / or by applying an overpressure on one or the other side which presses the shrink film onto the denture teeth. It can be provided that between the template or the female mold and the denture teeth, the at least one shrink film is arranged and the denture teeth are fixed by shrinking the at least one shrink film, while they are positioned by the template or the negative mold. It can be provided in turn that the template or the negative mold after fixing the denture teeth with the at least one shrink film of the prosthetic teeth and the at least one shrink film is solved or separated. As a result, the positioning is simplified without the template or the negative mold must then be used together with the denture teeth therein or for further processing. Instead, the template or negative mold can be reused to position a new set of prefabricated denture teeth. Further, it can be provided that in the template passages are provided for enclosing a central circumference of the prosthetic teeth or in the female mold recesses for receiving coronal or basal ends of the denture teeth are provided, wherein the passages or recesses are formed such that the prosthetic teeth in a clear position and orientation in the bushings or wells are to be used.

As a result, operating errors are excluded and it can be avoided that incorrectly positioned and oriented denture teeth are fixed with the at least one shrink film.

The cervical or medial circumference of a denture tooth is the circumference of the denture tooth between the coronal end and the basal end.

It may be provided that the lead-throughs form negatives of the medial peripheries of the denture teeth between the basal and coronal ends of the denture teeth, or that the depressions form negatives of the coronal or basal ends of the denture teeth. The negatives produce accurate fits so that the denture teeth can only be positioned in one orientation and position in the template or negative mold or are well defined. In addition, when the template or female mold is used to hold the teeth during milling, that is, when the template or female mold is fixed together with the denture teeth with the at least one shrink film, the denture teeth fixed therein are kept more stable. Furthermore, it can be provided that the depressions in the negative mold are so deep that they extend to at most the beginning of undercut regions of the prosthetic teeth.

By this measure it can be achieved that the prosthetic teeth already sit so stable in the wells after insertion into the negative mold without the position and the position of the prosthetic teeth is brought confused during shrinkage of at least one shrink film.

Furthermore, it can be provided that the depressions are so deep that they absorb at least 10% of the height of the denture teeth, preferably that they absorb at least 25% of the height of the denture teeth.

The height of the prosthetic teeth is the length of the denture teeth from the basal end of the denture teeth to the coronal end of the denture teeth.

Furthermore, it can be provided that in each recess at least one continuous connection is provided, through which a negative pressure in the recess is to be generated.

The at least one continuous connection may, for example, be a continuous bore which extends from the depression to a surface of the negative mold outside the depression and which may be connected to a vacuum source or is connected. With this measure, the denture teeth can be sucked into the wells and thereby secure in the wells or on the negative mold. In addition, the denture teeth are sucked in the correct position and orientation with the appropriate shape of the wells. Thus, when the depressions are negatives of the coronal sides of the prosthetic teeth, the effect is particularly strong. In addition, the heated shrink film can be sucked onto the prosthetic teeth with the vacuum applied via the continuous bore. Once the denture teeth are fixed with the at least one shrink film, the denture teeth no longer need to be sucked with the vacuum or the negative pressure in the wells. Preferably, therefore, the connection to the vacuum source is released after the at least one shrink film has been connected to the prosthetic teeth. The negative mold can be detached from the prosthesis teeth fixed with the at least one shrink film, or it can be fixed with the prosthesis teeth with the at least one shrink film. With a further development, the invention proposes that the prosthetic teeth are positioned within a frame and / or a holder before they are fixed with the at least one shrink film, preferably by shrinking the at least one shrink film of the frame and / or the holder with the denture teeth get connected. The shrinkage of the at least one shrink film is preferably carried out by applying the heated shrink film (s) to the surfaces of the denture teeth with a pressure difference, for example by sucking the at least one heated shrink film with a negative pressure. With the frame or the holder, a subsequent attachment in a milling machine can be simplified. For this purpose, on the frame or on the holder, a fastening means, such as a bayonet closure or a detent, be provided, with which the frame or the holder is to be attached to a milling cutter. Furthermore, provision can be made for the denture teeth to be enclosed in a form-fitting manner by the shrinkage of the at least one shrink film from the at least one shrink film.

As a result, a particularly stable connection is achieved. In addition, the denture teeth remain stable even if, in the subsequent processing of the denture teeth, or at least one denture tooth, the at least one shrunken shrink film is partially milled or opened.

According to a further development according to the invention for processing the prosthetic teeth, it can be provided that the prosthesis teeth fixed with the at least one shrink film are fastened in a defined position in a holder of a CAM device for removing material of the denture teeth by a CAM method and at least one basal end at least one denture tooth is computer-controlled with the CAM device, the CAM device being preferably a computer-controlled milling device, more preferably a computer-controlled four-axis milling machine or five-axis milling machine.

Hereby, the method for fixation is used beneficially for processing the denture teeth or at least one denture tooth. The Fixation with the at least one shrink film is inexpensive feasible and sufficiently stable for processing with a CAM device. This step makes use of the advantages that a device according to the invention and the method according to the invention offer for positioning, for automated methods in which the exact positioning according to the invention and the good accessibility of the area of the prosthetic teeth to be machined have a particularly advantageous effect.

Furthermore, it can be provided that the outer forms of all prefabricated prosthetic teeth used are present as the first data set and a second data set defines the exact positions and orientations of all fixed prefabricated prosthetic teeth in the at least one shrink film, wherein a subsequent processing of at least one denture tooth based on the first and of the second data set is carried out, preferably a subsequent processing with a CAD / CAM method based on the first and the second data set is performed.

As a result, a complete automation of the method can be achieved. In addition, the advantages of fixation are made available for fully automated post-processing procedures, for which they are particularly well suited. Only by the claimed fixation namely a simple and inexpensive deployment of denture teeth in a high accuracy and positional fidelity is possible.

Preferred methods according to the invention may also be distinguished by the fact that during processing of the prosthetic teeth fixed in the at least one shrink film, the shrink film resting against the denture teeth is opened, preferably opened with the same tool with which the denture teeth are also machined.

With this measure, the advantage offered by the at least one shrink film is used particularly well. The at least one shrink film can namely be easily removed in areas without the stability of the structure would be too much affected, that is, without the fixation of the prosthetic teeth would be completely eliminated.

It may further be provided that the position and / or orientation of the fixed denture teeth to each other after fixing with the at least one Shrink film is tested or determined, wherein preferably a second data set is generated and stored, are stored in the information on the position and / or orientation of the fixed denture teeth.

As a result, the fixed prosthetic teeth can also be used if the position and / or the orientation of the prosthetic teeth changes during the thermal shrinkage of the at least one shrink film. According to the invention, a subsequent processing of at least one prosthetic tooth is carried out on the basis of the second data set, preferably a subsequent processing with a CAD / CAM method on the basis of the second data set. The objects underlying the present invention are also achieved by a set for processing a plurality of prosthetic teeth having a plurality of prosthetic teeth, which are fixed in position and orientation relative to each other with at least one shrink film.

The shrink film is preferably thermally shrunk. Most preferably, the shrink wrap has first been heated and then applied to the denture teeth with a pressure differential. The denture teeth are preferably not heated.

It can be provided that the set comprises a template, a negative mold, a holder and / or a frame, which is or is connected via the at least one shrink film with the prosthetic teeth or are fixed in particular with the prosthetic teeth or are.

According to the invention, the set can also have a data carrier or a data packet with at least one data record relating to the shape of the prosthetic teeth and / or the position and / or orientation of the prosthetic teeth relative to one another. Furthermore, it can be provided that the set is produced by a method according to the invention.

The invention is based on the surprising finding that denture teeth are to be fixed in a unique position and orientation relative to one another via a shrink film so that the denture teeth can be processed with a fully automatic CAM method with the aid of a computer-controlled milling cutter. The shrink film offers the surprising advantage that, even if it completely encloses the denture teeth, it can be easily opened in the places, at which a processing of the denture teeth should take place. The opening of the at least one shrink film can be done with the same tools that are also used for processing the denture teeth. Alternatively, the areas of the denture teeth to be treated may also be left free from the shrink film, in particular the basal ends of the denture teeth may be left exposed, that is, not covered by shrink film. For a more stable positioning of the prosthetic teeth, either a plurality of shrink films can be used one above the other or with the at least one shrink film, a template or a negative mold is additionally fixed, with which the prosthetic teeth are held in the desired position and orientation.

As a result, it is possible with a method according to the invention to be able to machine the basal and coronal ends of the denture teeth with a milling cutter. The method and set are particularly well suited for use with CAD / CAM methods, especially with CAM-controlled or computer-controlled milling. The retouched denture teeth can be easily removed without residue by loosening the shrink film after processing and are immediately available for the treatment of a patient. The attachment of denture teeth is fast and easy to carry out. An elaborate production of the holder, as is necessary with wax holders, is omitted in the set according to the invention and the method according to the invention. In addition, it is not necessary to wait until the wax has solidified. Shrink films are inexpensive to purchase and easy to use.

The great advantage of the method according to the invention lies in the very fast and almost tool-free and tool-free implementation. As a result, it is possible to dispense with the provision of larger storage quantities and order-related packaging can be carried out. Also eliminates the otherwise necessary for wax cleaning by brewing or brushing the denture teeth.

The introduction of contact means in the template or negative mold can still improve the connection of the template or negative mold to the denture teeth. As an exemplary contact agent, polyvinyl alcohol can be used, which forms an adhesive bonding layer after solvent contained by evaporation. The invention may provide, for example, that the denture teeth are provided fixed as a set with the at least one shrink film in the desired or known position and orientation so that they can be directly machined basal and / or coronal in the CAM process, in particular milled, can and Thus, the individual situation of the patient can be adjusted.

In order to be able to implement this technical approach, the prefabricated denture teeth must be positioned and held in a predefined position within the set that can be clamped in the machine. For this purpose, a holder or a frame can be used which is expediently adapted to the receiving mechanism of the respective CAM machine. For this purpose, it can be provided according to the invention that the frame and / or the holder is or are contained in the set and is fixed to the denture teeth with the at least one shrink film. When using a negative mold with recesses or a template with performing the prefabricated prefabricated prosthetic teeth are pressed with the shrink film in the wells of the negative mold or in the passages of the template. The prosthetic teeth and the negative mold or the template are not damaged when removing the denture teeth and can be reused if necessary.

The negative mold or the template and optionally the frame and / or the holder are preferably made of deformation-resistant material, for example an elastic plastic material such as polymethyl methacrylate (PMMA) or polyurethane (PU) or other plastics with filler or of metallic materials. The negative mold or the template is preferably produced by milling, but can also be produced by injection molding or sintering.

Embodiments of the invention will be explained below with reference to five schematically illustrated figures, without, however, limiting the invention. 1 shows a schematic cross-sectional view of a set according to the invention with a negative mold;

Figure 2 is a schematic cross-sectional view of an alternative set according to the invention; FIG. 3 shows a schematic cross-sectional view of a further alternative set according to the invention in a negative mold;

4 shows a schematic plan view of an inventive set with a frame; and FIG. 5 shows a schematic cross-sectional view of a further alternative set according to the invention with a template.

In the figures, the same reference numerals are sometimes used in different versions for similar parts. In all cross-sectional views, cut surfaces are shown hatched. FIG. 1 shows a schematic cross-sectional view of a set according to the invention. The kit comprises a shrink film 1 which has been thermally shrunk and has been applied to the surfaces of a plurality of denture teeth 2. For this purpose, the shrink film 1 is heated and then placed on the positioned prosthetic teeth 2. Subsequently, the heated shrink film 1 is sucked on the prosthetic teeth 2 with a negative pressure. The set has a negative mold 6 in the form of a plate (bottom in Figure 1), in which the prosthetic teeth 2 (of which only one can be seen in the cross-sectional view of Figure 1) are arranged. The prosthetic teeth 2 are inserted into matching recesses 8 in the female mold 6. The negative mold 6 consists of a dimensionally stable material, such as a not too soft metal, such as brass or steel, but not lead, or of a hard plastic such as PMMA. The negative mold 6 according to FIG. 1 can both belong to the set by being fixed with the shrink film 1 with the prosthetic teeth 2, as well as separately, so that the prosthetic teeth 2 with the shrink film 1 form the set and are removed from the negative mold 6 can. The negative mold 6 with the recesses 8 then serves exclusively to position the prosthetic teeth 2 in a predetermined position and orientation relative to each other.

The prosthetic teeth 2 have a coronal side 12 and a coronal end 12 (bottom in Figure 1), a basal side 14 and a basal end 14 (in Figure 1 above) and a circumferential tooth neck between the coronal side 12 and the basal side 14 of Denture teeth 2 on.

The recesses 8 form a negative of the coronal sides 12 of the prosthetic teeth 2, so that the prosthetic teeth 2 with the coronal side 12 flush in the Wells 4 can be used. In addition to a slight hold, the position of the denture teeth 2, which differ from one another, is thus uniquely predetermined. In the recess 8, a bore 18 is provided, through which a negative pressure in the recess 8 can be generated, so that the denture tooth 2 is sucked into the recess 8 and thereby held there until the shrink film 1 to the prosthetic teeth 2 or to the Prosthetic teeth 2 and the female mold 6 is attached. In addition, the negative pressure is used to absorb the shrink film 1 on the prosthetic teeth 2 and on the upper surface of the female mold 6. When the denture teeth 2 with the shrink film 1 for processing the denture teeth 2 are to be detached from the female mold 6, it is preferred if the recesses 8 form a negative of the basal sides 14 of the denture teeth 2. Then the basal ends 14 of the prosthetic teeth 2 are exposed and can be processed without the shrink film 1 would have to be opened. In order for the denture teeth 2 to hold in the shrink wrap 1, the circumferential tooth neck between the basal side 14 and the coronal side 12 should be enclosed by the shrink wrap 1 to prevent the denture teeth 2 from simply falling out of the shrunken shrink wrap 1.

Due to the thermal shrinkage of the shrink film 1, an elastic force is exerted on the prosthetic teeth 2, which fixes the denture teeth 2 on the female mold 6. The position and orientation of the prosthetic teeth 2 is determined by the unique shape of the recesses 8. When the shrink film 1 is closed around the female mold 6 (not shown in FIG. 1), the shrink film 1 exerts such an elastic force on the denture teeth 2 that the denture teeth 2 are pressed into the recesses 8. For firmer fixation of the prosthetic teeth 2 and several shrink films 1 can be superimposed and shrunk.

Once the prosthetic teeth 2 are fixed with the shrink film 1, the negative pressure at the bore 18 can be removed, that is, the vacuum source to be separated. The set of fixed denture teeth 2 is then inserted into a computer-controlled milling machine (not shown) and the denture teeth 2 are machined on the basal side 14 with the mill. If the female mold 6 is not part of the set, the coronal side 12 of the denture teeth 2 can also be processed. In a known form of the set and in known prefabricated prosthetic teeth 2 whose shape, position and Position or orientation can be used as a record, is calculated on the basis of a CAM program in the computer by known methods, at which points basal material must be removed from the prosthetic teeth 2. The stabilization and fixation of the prosthetic teeth 2 with the shrink film 1 and the negative mold 6 is so stable that a basal processing of the prosthetic teeth 2 with a milling machine is possible, without affecting the position and position of the prosthetic teeth 2 in the device due to mechanical stress changes.

After the denture teeth 2 have been processed, they can be easily removed from the negative mold 6 or the shrink film 1 by loosening the shrink film 1 from the female mold 6 and glued into a prosthesis base (not shown) for producing a dental prosthesis.

FIG. 2 shows a schematic cross-sectional view of an alternative set according to the invention. The set comprises a first shrink film 1, which has been thermally shrunk and thereby has been applied to the surfaces of a plurality of prosthetic teeth 2. The prosthetic teeth 2 have a coronal side 12 and a coronal end 12 (in Figure 2 below), a basal side 14 and a basal end 14 (in Figure 2 above) and a circumferential tooth neck between the coronal side 12 and the basal side 14 of Denture teeth 2 on. The first (upper) shrink film 1 encloses the basal sides 14 of the denture teeth 2.

The set has on the bottom side (in Figure 2 below), a second shrink film 20, which encloses the coronal sides 12 of the prosthetic teeth 2. The two shrink films 1, 20 enclose the denture teeth 2 on all sides, or envelop them. In this case, the position and orientation of the prosthetic teeth 2 is fixed to each other.

For better handling of the prosthetic teeth 2, a frame and / or a holder (not shown) may also be enclosed in the shrink-films 1, 20 with the prosthetic teeth. The frame and / or the bracket then serve to stabilize the set and can also be used to attach the set to or in the mill for machining the denture teeth 2. The prosthetic teeth 2 can be processed in the set shown in Figure 2 on both sides, ie coronal and basal. Due to the thermal shrinkage of the shrink films 1, 20, an elastic force is exerted on the prosthetic teeth 2, which fixes the denture teeth 2. The position and orientation of the prosthetic teeth 2 is clearly defined relative to each other. Once the prosthetic teeth 2 are fixed with the shrink films 1, 20, the set of fixed denture teeth 2 can be inserted into a computer-controlled milling machine (not shown). The denture teeth 2 are processed on the basal side 14 and possibly also on the coronal side 12 with the milling cutter. In the case of a known form of the set and in the case of known prefabricated prosthetic teeth 2, their shape, position and position or orientation can be used as a dataset, on the basis of which a CAM program is calculated in the computer by known methods, at which points basal material from the prosthetic teeth 2 must be removed. The stabilization and fixation of the prosthetic teeth 2 with the shrink films 1, 20 is sufficiently stable, so that a basal processing of the prosthetic teeth 2 with a milling machine is possible without changing the position and the position of the prosthetic teeth 2 in the device due to the mechanical load , For more stable fixation of the prosthetic teeth 2, even more layers of the shrink film 1, 20 can be used.

After the denture teeth 2 have been processed, they can be removed from the shrink film 1, 20 by loosening the shrink film 1 and glued into a denture base (not shown) for the production of a dental prosthesis.

FIG. 3 shows in a schematic cross-sectional view how the prosthetic teeth 2 can be positioned when the shrink films 1, 20 are applied. For this purpose, a negative mold 26 is used, in which recesses 28 are present, in which the prosthetic teeth 2 can be placed in a unique position and orientation with the second shrink film 20 in between. The shrink films 1, 20 may also be formed by a single shrink film which encloses the female mold 26 with the denture teeth 2 in a tubular manner. The negative mold 26 is made of a dimensionally stable material, such as a not too soft metal, such as brass or steel, but not lead, or of a hard plastic such as PMMA. The negative mold 26 according to FIG. 3 can belong to both the set and the shrink films 1, 20 Prosthetic teeth 2 is fixed, as well as separately, so that the prosthetic teeth 2 with the shrink films 1, 20 form the set (as shown in Figure 2) and can be removed from the female mold 26. The negative mold 26 with the recesses 28 then serves exclusively to position the prosthetic teeth 2 in a predetermined position and orientation relative to each other. The thickness of the shrink film 20 is taken into account in the size of the recesses 28.

FIG. 4 shows a schematic plan view of a set according to the invention. At least one shrink film 1 covers a plurality of different prosthetic teeth 2 and a frame 40 in which a plurality of compartments for the prosthetic teeth 2 are contained. The reference numeral of the at least one shrink film 1 is directed only to the shrink film 1 within the compartments of the frame 40, as hide at this point no other objects, so no denture teeth 2 and no frame 40, under the at least one shrink film 1. If necessary, however, a template or a negative mold could be arranged there. The frame 40 is used to stabilize the set and can be clamped in a computer-controlled 4-axis or 5-axis milling machine as a CAM device to edit the denture teeth 2. Otherwise, the structure corresponds to that of Figures 1 to 3. Thus, for example, a negative mold or a stencil to be included in the at least one shrink film 1 and thus secured.

FIG. 5 shows a schematic cross-sectional view of a further alternative set according to the invention. The kit comprises a first shrink film 1 that has been thermally shrunk to a pressure differential and has been applied to the surfaces of a plurality of denture teeth 2. The prosthetic teeth 2 have a coronal side 12 and a coronal end 12 (bottom in Figure 5), a basal side 14 and a basal end 14 (in Figure 5, top) and a circumferential tooth neck between the coronal side 12 and the basal side 14 of Denture teeth 2 on.

The set comprises a template 46 in the form of a plate with several feedthroughs, in which the prosthetic teeth 2 (of which only one can be seen in the cross-sectional view according to FIG. 5) are arranged. The denture teeth 2 are inserted in the passages in the template 46. From the opposite side, a second shrink film 20 is applied over the coronal sides 12 of the prosthetic teeth 2. The two shrink films 1, 20 include the template 46 with the denture teeth therein. The template 46 is made of a dimensionally stable material, such as a not too soft metal, such as brass or steel, but not lead, or of a hard plastic such as PMMA. The template 46 according to FIG. 5 belongs to Set, since it is fixed to the shrink-foils 1, 20 with the prosthetic teeth 2. The template 46 with the passages therein serves to position and hold the prosthetic teeth 2 in a predetermined position and orientation relative to one another.

The bushings form a negative of a region of the circumferential tooth neck of the prosthetic teeth 2, so that the prosthetic teeth 2 can be used with the tooth neck flush in the bushings. In addition to a slight hold, the position of the denture teeth 2, which differ from one another, is thus uniquely predetermined.

Due to the thermal shrinkage of the shrink films 1, 20, an elastic force is exerted on the prosthetic teeth 2, which fixes the denture teeth 2 in the template 46. The position and orientation of the prosthetic teeth 2 is determined by the unique shape of the bushings. When the shrink films 1, 20 are closed around the template 46, the shrink films 1, 20 exert an elastic force on the prosthetic teeth 2, which fixes the denture teeth 2 in the passages. For firmer fixation of the prosthetic teeth 2, further layers of shrink films (not shown) can be superimposed and shrunk.

Once the denture teeth 2 are fixed with the shrink films 1, 20, the set of fixed denture teeth 2 can be inserted into a computerized milling machine (not shown) and the denture teeth 2 become on the basal side 14 and, if desired, on the coronal side 12 worked with the milling machine. In a known form of the set and in known prefabricated prosthetic teeth 2 whose shape, position and position or orientation can be used as a record, is calculated on the basis of a CAM program in the computer by known methods, at which points basal and possibly also coronal material must be removed from the denture teeth 2. The stabilization and fixation of the prosthetic teeth 2 with the shrink film 1, 20 and the template 46 is so stable that a processing of Prosthetic teeth 2 is possible with a mill, without changing the position and the position of the prosthetic teeth 2 in the device due to the mechanical load.

After the denture teeth 2 have been processed, they can be easily removed from the template 46 or the shrink films 1, 20 by loosening the shrink films 1, 20 from the template 46 and glued into a prosthesis base (not shown) for producing a dental prosthesis.

In addition to the data on the prosthetic teeth 2 and the set, the processing of the prosthetic teeth 2 can be carried out on the basis of data previously recorded in the oral cavity of a patient in order to adapt the denture teeth 2 to the oral cavity situation. For a good fit, the denture teeth 2 are especially processed basal. Such methods are known and for details, reference is made to WO 201 1/066 895 A1. After processing of the prosthetic teeth 2, the set is removed from the milling machine and the shrink film (s) 1, 20 and optionally the negative mold 6, 26, the frame 40 or the template 46 are separated from the denture teeth. For this purpose, the shrink films 1, 20 can be cut open or torn open. The denture teeth 2 are then isolated and can be used in the denture base.

The features of the invention disclosed in the foregoing description, as well as the claims, figures and embodiments may be essential both individually and in any combination for the realization of the invention in its various embodiments. It is understood that the device for the shown numbers of prosthetic teeth 2 in addition to the embodiment shown with eight prosthetic teeth 2 are readily transferable to other numbers of prosthetic teeth 2, wherein the full set of twenty-eight prosthetic teeth 2 according to the invention is preferred, even if this purpose the clarity is not shown. LIST OF REFERENCE NUMBERS

1 shrink film

2 prosthetic teeth

6 negative form

8 depression as a negative of the coronal prosthetic tooth shape

12 Coronal side / coronal end of denture tooth

14 Basal side / basal end of denture tooth

18 hole

20 shrink film

26 negative form

40 frames

46 template

Claims

claims

1 . Method for the fixation of prefabricated prosthetic teeth (2), and preferably also for the treatment, of prefabricated prosthetic teeth (2), comprising the following method steps:

a plurality of prefabricated prosthetic teeth (2) are positioned and brought into contact with at least one shrink film (1, 20),

the at least one shrink film (1, 20) is then shrunk and thereby fixes the denture teeth (2) in their position and orientation to each other.

2. The method according to claim 1, characterized in that

the prosthetic teeth (2) are inserted into a template (46) or a female mold (6) such that at least the basal ends (14) or coronal ends (12) protrude from the template (46) or the female mold (6) the prosthetic teeth (2) are fixed in position and orientation relative to one another by the template (46) or the negative mold (6), and wherein the at least one shrink film (1, 20) contacts at least the basal or coronal ends (12, 14) of the Denture teeth (2) is placed before the

Prosthetic teeth (2) with the at least one shrink film (1, 20) are fixed, preferably the basal and the coronal ends (12, 14) from the template (46) protrude.

A method according to claim 2, characterized in that

the at least one shrink film (1, 20) is heated to the in the stencil

(46) or the negative mold (6) inserted prosthetic teeth (2) is placed around, and then the at least one shrink film (1, 20) is shrunk with a pressure difference on the prosthetic teeth (2) and thereby the prosthetic teeth (2) in the template (46) or the negative mold (6) fixed.

A method according to claim 2, characterized in that

between the template (46) or the negative mold (6) and the

Prosthetic teeth (2) which is arranged at least one shrink film (1, 20) and the denture teeth (2) are fixed by shrinking the at least one shrink film (1, 20) while being positioned by the template (46) or the female mold (6).

Method according to one of the preceding claims, characterized in that

in the template (46) passages are provided for enclosing a central circumference of the prosthetic teeth (2) or in the negative mold (6) depressions (8) for receiving coronal or basal ends (12, 14) of the prosthetic teeth (2) are provided wherein the passages or depressions (8) are shaped such that the denture teeth (2) are to be inserted in a unique position and orientation in the passages or depressions (8).

Method according to claim 5, characterized in that

the grommets form negatives of the medial peripheries of the denture teeth (2) between the basal and coronal ends (12) of the denture teeth (2) or the recesses (8) form negatives of the coronal or basal ends (12, 14) of the denture teeth (2) ,

Method according to one of the preceding claims, characterized in that

the prosthetic teeth (2) are positioned within a frame (40) and / or a holder before they are fixed with the at least one shrink film (1, 20), preferably by the shrinkage of the at least one shrink film (1, 20) of the frame (40) and / or the holder are connected to the prosthetic teeth (2).

Method according to one of the preceding claims, characterized in that

the prosthetic teeth (2) in the shrinkage of at least one shrink film (1, 20) of the at least one shrink film (1, 20) are positively enclosed. Method according to one of the preceding claims, characterized in that

the prosthesis teeth (2) fixed with the at least one shrink film (1, 20) are fastened in a defined position in a holder of a CAM device for removing material of the denture teeth (2) by a CAM method and at least one basal end (14 ) of at least one prosthetic tooth (2) is computer-controlled with the CAM device, the CAM device preferably being a computer-controlled milling device, more preferably a computer-controlled four-axis milling machine or five-axis milling machine.

10. The method according to any one of the preceding claims, characterized in that

the outer forms of all prefabricated prosthetic teeth (2) used are present as the first data set and a second data set the exact

Positions and orientations of all fixed prefabricated prosthetic teeth (2) defined in the at least one shrink film (1, 20), wherein a subsequent processing at least one prosthetic tooth (2) is performed on the basis of the first and the second data set, preferably a subsequent machining with a CAD / CAM method is performed based on the first and the second data set.

1 1. Method according to one of the preceding claims, characterized in that

during processing of the prosthesis teeth (2) fixed in the at least one shrink film (1, 20), the shrink film (1, 20) resting against the prosthetic teeth (2) is opened, preferably opened with the same tool with which the prosthetic teeth ( 2) are processed. 12. The method according to any one of the preceding claims, characterized in that

the position and / or the orientation of the fixed prosthetic teeth (2) are checked or determined relative to one another after fixing with the at least one shrink film (1, 20), preferably a second data set is generated and stored in the information on the position and / or orientation of the fixed denture teeth (2) are stored.

3. set for processing a plurality of prosthetic teeth (2) comprising a plurality of prosthetic teeth (2), which are fixed in position and orientation relative to each other with at least one shrink film (1, 20).

4. Set according to claim 13, characterized in that

the set comprises a template (46), a negative mold (6), a holder and / or a frame (40) which is or are connected to the prosthetic teeth (2) via the at least one shrink film (1, 20), is fixed in particular with the prosthetic teeth (2) or are.

5. Set according to claim 13 or 14, characterized in that

the kit is made by a method according to any one of claims 1 to 9 or 12.