EP2964140A1

EP2964140A1 - Method for producing a prosthesis base

Info

Publication number: EP2964140A1
Application number: EP14707928.9A
Authority: EP
Inventors: Ineke LINDEMANN
Original assignee: Amann Girrbach AG
Current assignee: Amann Girrbach AG
Priority date: 2013-03-07
Filing date: 2014-02-06
Publication date: 2016-01-13
Also published as: CN105208967A; DE102013003913A1; JP2016513480A; US20160000539A1; WO2014134640A1; CN105208967B

Abstract

The invention relates to a method for producing a prosthesis base (1) from plastics material for a full or partial dental prosthesis (2), wherein the prosthesis base (1) has prosthesis base receiving openings (3) for artificial teeth (4) and is produced on the basis of a digital data set which reflects a shape of the prosthesis base (1) having the prosthesis base receiving openings (3). On the basis of this digital data set first a wax temporary prosthesis (6) having corresponding wax temporary receiving openings (7) for the artificial teeth (4) is made, and subsequently the prosthesis base (1) is made using the wax temporary prosthesis (6).

Description

Process for the preparation of a denture base

The present invention relates to a process for producing a

A prosthesis base made of plastic for a full or partial dental prosthesis, the prosthesis base having prosthetic base receiving recesses for artificial teeth, and based on a digital data set representing a shape of the denture base

Prosthesis base with the denture base receiving recesses is reflected, is produced.

Dental full or partial dentures basically consist of at least two different components. On the one hand, this is a prosthesis base which replaces the missing parts of the gum in the patient. On the other hand, these are artificial teeth, which replace the missing natural teeth of the

Patients act. The artificial teeth are connected in the full or partial denture with the denture base and have both therapeutic and aesthetic functions. A full denture replaces all the teeth of a patient's jaw. A partial denture only a part of it. Artificial teeth are offered by various manufacturers. The prosthetic teeth available on the market are ready-made shapes that vary in their colors. There are pre-fabricated tooth shapes on the market of various sizes, which are selected by the dental technician according to certain individual characteristics of the patient, e.g.

Space, body size, gender and figure are selected. The denture base made of plastic or to be produced must fit exactly to the particular edentulous or partially edentulous mandibular arch of the patient and, as it were, take into account the individual prescriptions in the patient's mouth. Full or partial dentures are available both for the upper jaw and for the

Lower jaw. In the entire dental technology, the automated or computer-controlled production of dental prostheses has been increasingly introduced in recent years. Thus, in the prior art, there are already various proposals as to how generic methods can be carried out. Thus, EP 1 444 965 B1 provides that, based on the aforementioned digital data set, the prosthesis base is produced directly and then filled with prefabricated teeth. An at least similar procedure is also described in DE 40 25 728 AI. Here, in the case of the various variants, it is always provided in each case that so-called registratbases are milled out of a plastic block on the basis of the said digital data set, in order then to set up the teeth in further steps.

In the cited prior art, it is thus always provided that, based on the aforementioned data set, a prosthesis base or at least one prosthesis base

Registratbasis is made of plastic. But this has the disadvantage that there are only limited possibilities, such as the prosthesis base or the

Registratbasis in detail or in the fine adjustment to the situation in the

Oral cavity of the patient can be adjusted. It then stays to this

Adjustment only a machining, in which disturbing areas of the denture base or the Registratbasis removed but never missing parts can be added.

The object is therefore to propose a new embodiment of the generic method, which improves the possibilities for producing an optimally adapted denture base.

To solve this problem, the invention proposes a method according to

Claim 1 before.

It is thus provided that on the basis of the digital data set first a temporary wax with corresponding wax provisional recording recesses for the artificial teeth is made and then using the wax temporary denture base is made.

A basic idea of the invention is thus, based on the data set, which reflects a form of the prosthesis base with the prosthesis base receiving recesses, not directly the prosthesis base itself but as an intermediate step a wax temporary with the corresponding

Wax proposorption receptacles for the artificial teeth

to customize. This wax temporary offers the possibility that it can be found in the mouth of the patient or even without a patient on a corresponding plaster cast

Passport accuracy can be tested. If it is determined that an optimal fit already exists, then the wax provisional can be used without further processing for the preparation of the denture base. If the test stated that the fit should still be optimized, it can

Wax temporary, e.g. After previous heating so reshaped or edited by milling or by anabolic or generative process so that an optimal fit is present. In this case, then optimized in his fit wax temporary can be used to make the denture base. An advantage of the intermediate step according to the invention via the temporary wax is thus essentially that the temporary wax prepared on the basis of the digital data set can be better adapted to the desired optimum shape, as a made according to the prior art from the digital data set prosthetic base made of plastic. There are various options for making the temporary wax. For example, it can be provided that the wax provisional with the

corresponding wax provisional recesses for the artificial teeth is milled on the basis of the digital data set with a milling device. Alternatively, however, it can also be provided that the wax provisional with the

corresponding wax provisional receiving recesses for the artificial teeth based on the digital data set is produced by a generative method. Suitable generative methods are known in the art known. There are methods with which the body to be erstend sirloin, here so the temporary wax, possibly multi-layered, is built. As an example, it should be mentioned that the wax provisional with the

Wax temporary recesses based on the digital data set with a 3D plotter or 3D printer, usually liquid, wax is built up. Examples of suitable generative methods are also the so-called selective laser melting so selective melting by means of laser or the

Stereolithography. It should be noted in this context that the

Wax temporary already produced according to the invention

Wax provisional receiving recesses and always has the shape of the entire data set, which has the shape of a prosthesis base with their prosthesis base receiving recesses. The wax temporary thus also has at least one surface which serves to rest against the gum in the condition inserted in the mouth of the patient.

To make the denture base using the wax temporary, there are also various possibilities. A first consists e.g. in per se known copy milling. It is equally possible to scan the wax temporary and then, based on the data set thus generated, to fix the denture base e.g. to make a computer-controlled milling or the

Prosthesis base with the prosthesis base receiving recesses with a generative method, e.g. with one of the above with respect to the wax temporary exemplified generative method to build from plastic.

However, particularly preferred embodiments of the invention provide that the prosthesis base with or without the in the

Prosthesis base receiving recesses arranged artificial teeth using the wax temporary with or without the in the

Wax temporary receiving recesses arranged artificial teeth is produced in a casting process or in a stuffing process. For this purpose, conventional plastic casting or stuffing methods can be used in dental technology. It can be provided that the artificial teeth are inserted into the wax temporary accommodation recesses before the preparation of the prosthesis base become. In this case, preferred variants again provide that the prosthesis base with artificial teeth inserted in the prosthesis base receiving recesses using the temporary wax into the

Wax temporary insertion recesses used artificial teeth is made.

The artificial teeth may be prefabricated products that can be purchased on the market and, unless their root is too long, inserted into the wax provisional receiving recess or prosthesis base receiving recess without further processing. Are the artificial ones

Teeth too long, so provides a preferred variant of the method according to the invention that at least a portion of the artificial teeth before insertion into the

Wax temporary recesses or the

Prosthesis base receiving recesses are pre-shortened in their, to be arranged in the wax provisional or denture base area. The im

Wax temporary or to be arranged in the denture base area of

artificial tooth is its root or cervical area. This is shortened in this preferred embodiment prior to insertion. This can be done manually. There are already known in the prior art in the form of DE 10 201 1 101 678 A21 possibilities, such as this shortening of the artificial teeth can be done automatically or computer controlled.

For the creation of the digital data set, based on which with the

Milling device first the temporary wax with appropriate

Wax temporary recesses for the artificial teeth can also be recourse to procedures, as described in the prior art, are used. Such methods are e.g. in the aforementioned prior art in the form of EP 1 444 965 B 1 described. It can thus be provided that first the shape of the partially or completely edentulous mandibular arches is scanned in the patient's mouth.

Alternatively, it is also possible, in a known manner by means of impression taking on Upper and / or lower jaw of the patient to create plaster models that the

Play back the geometry of the upper and / or lower jaw arch so that they can be scanned in if necessary. The plaster models or the records of the mandibular arches generated by scanning are then articulated in a known manner either analog or digital. Subsequently, either analog or digital, a model analysis is carried out. Based on the odellanalyse then the appropriate artificial teeth are selected and placed in analog or digital manner on the digital model or the analogous plaster model of the upper and / or lower jaw arch, from which then also in a digital or analog manner, the form or the Record is generated, which the shape of the prosthesis base to be generated with the

Prosthesis base receiving recesses reflects.

Preferred variants of methods according to the invention are explained in more detail below with reference to the description of the figures. Show it:

Fig. 1 with a known in the prior art CNC milling device with

Control computer;

Fig. 2 is a wax temporary for the upper jaw without artificial teeth;

Fig. 3 is a temporary wax for the lower jaw without artificial teeth;

Fig. 4, the temporary wax from Fig. 2 with in the

Wax temporary seating recesses inserted artificial teeth; Fig. 5, the temporary wax from Fig. 3 with in the

Wax temporary seating recesses inserted artificial teeth; Fig. 6 schematically illustrates the mold made using the temporary wax of the upper jaw with the artificial teeth of Fig. 4;

FIG. 7 shows the same mold as FIG. 6, but with the wax provisional already removed; FIG.

8 shows the finished denture base of the upper jaw with inserted artificial teeth;

FIG. 9 shows the completed prosthetic base of the lower jaw with inserted artificial teeth; FIG. 10 shows the denture base of the upper jaw without artificial teeth;

Figure 1 1, the prosthesis base of the lower jaw without artificial teeth.

12 to 14 are schematic representations of suitable generative methods. Fig. 1 shows a known in the prior art milling device 5 in the form of a CNC milling device, which is controlled by a control computer 14. The milling device 5 has a housing 12 with a processing cavity 15. The processing cavity 15 is accessible from the outside when the closure flap 13 is open, as shown in FIG. 1, and can be closed during the milling process by correspondingly lowering the closure flap 1 3. In the processing cavity 15 of the milling process for the preparation of

Wax temporary 6 with the wax provisional receiving recesses 7 for the artificial teeth 4 are performed. For this purpose, the digital data set, which is a form of the prosthesis base 1 to be produced with the

Prosthesesbasisaufnahmeausnehmungen 3 reflects are loaded into the control computer 14, which passes the corresponding control commands for the milling process for producing the wax temporary 6 to the milling device 15. For the milling process, the wax blank, not shown here on the

Fastening device 18 of the pivot arm 17 in not shown here but fixed in a known manner. The wax blank is shown in the picture

Embodiment rotatable about the axis of rotation 19. The pivot arm 17 is additionally pivotable about the pivot axis 16. The milling out of the wax temporary 6 from the wax blank, not shown here, by means of the tool 20 which is rotatably mounted on the tool carrier head 21 about its longitudinal axis. The tool carrier head 21 can be moved in all three spatial directions in the processing cavity 15 in the illustrated embodiment of the milling device 5. Such a milling process is known per se and need not be explained further here.

As a result of this milling process, the temporary wax 6 is obtained with the wax provisional receiving recesses 7 for the artificial teeth 4. FIG. 2 shows a corresponding wax provisional 6 with the

Wax temporary recesses 7 for the upper jaw. Fig. 3 shows a corresponding temporary wax 6 with the

Wax temporary recesses 7 for the lower jaw. In Figs. 4 and 5, these wax provisional 6 are each already in the

Wax temporary recesses 7 inserted artificial teeth 4 shown.

In a further method step of a preferred embodiment of the invention, a casting mold 8 is then made with the temporary wax 6 with the artificial teeth 4 arranged therein, the inner cavity 9, the outer contour of the temporary wax 6 with the in the

Wax provisional receiving recesses 7 arranged artificial teeth 4 reflects. FIG. 6 diagrammatically shows a corresponding casting mold 8 with the temporary wax 6 arranged therein with the artificial teeth 4 according to FIG. 4. It is thus the casting mold 8 for the denture base 1 for the upper jaw. The production of the mold 8 for the lower jaw using the temporary wax 6 according to FIG. 5 is carried out accordingly and is not shown here. In the example shown here, the casting mold 8 consists of an upper mold half 22 and a lower mold half 23. These two mold halves 22 and 23 remain closed in the first variant of the method according to the invention until, as explained below, the finished prosthesis base 1 with the therein arranged artificial teeth 4 is removed.

In Figs. 6 and 7, the upper mold half 22 is shown transparent, so that one can recognize the position of the inner cavity 9. The mold 8 or the upper and lower mold halves 22 and 23 form a negative impression of the wax temporary 6 with artificial teeth 4 inserted therein. The mold halves 22 and 23 or the mold 8 can be made of gypsum or other suitable material by pouring the wax provisional 6 inserted artificial teeth 4 are generated. Subsequent to the production of the casting mold 8, the temporary wax 6 in the casting mold 8 can be melted and the resulting liquid wax can be discharged from the internal cavity 9 through overflow openings 10 of the casting mold 8. It is preferably provided that the artificial teeth 4 are held during and after the release of the liquid wax from the inner cavity 9 of the mold 8 in its position in the inner cavity 9. The situation in which the temporary wax 6 by melting and draining the wax from the

Inner cavity 9 is removed, the artificial teeth 4 of the mold 8 but still held in its original position is shown in Fig. 7. Starting from this form can then by draining the liquid wax in

Inner cavity 9 become vacant volume 1 1 to form the prosthesis base 1 are filled with the plastic from which the future prosthesis base 1 consists. Suitable pourable and then curing plastics for the formation of dental prosthesis bases are known in the art. When filling the vacant volume 1 1 with the plastic and the artificial teeth 4 in the prosthesis base 1 are also attached. If the plastic has hardened accordingly, the casting mold 8 can be made e.g. opened by separating upper and lower mold halves 22 and 23 and the prosthesis base 1 together with the therein

arranged artificial teeth 4 are removed. Fal ls necessary, the prosthesis base 1 can still with known in the prior art means, for. Be reworked by milling, e.g. to remove sprue pieces from the overflow openings 10.

The filling of the liquid plastic in the inner cavity 9 in the embodiment shown again via the overflow 10. In this case, one of the overflow 10 can be used as a filler neck and the other overflow 10 as a vent. The inner cavity 9 can also be filled by both overflow openings 10 with correspondingly liquid plastic, wherein then conveniently other, not shown here

Vent holes for the escape of the displaced gas or the displaced air can be provided. The thus completed prosthesis base 1 of the upper jaw with the artificial teeth 4 already secured therein by the casting process is shown in FIG. It is a full denture 2 consisting of denture base 1 and the Artificial teeth 4 arranged therein. Fig. 9 shows a corresponding

to be produced full denture 2 for the temporary wax 6 with it

arranged artificial teeth 4 shown in FIG. 5 can be used as a starting product.

The casting process was in the above described variant based on the

Wax temporary 6 performed with inserted into the wax provisional receiving recesses 7 artificial teeth 4. In principle, it is also possible to carry out a corresponding casting process on the basis of the wax temporaries 6 shown in FIGS. 2 and / or 3 without the correspondingly used artificial teeth 4. The result of this casting process are then

Prosthesis bases 1 with the prosthesis base receiving recesses 3, as shown in Figs. 10 and 1 1. In these variants, the artificial teeth 4 can then follow the casting process in the

Denture base receiving recesses 3 are inserted or glued in accordance with, then again to produce the complete full denture 2 according to FIGS. 8 and 9. Is based on a temporary wax 6 without the therein

arranged artificial teeth 4 made a casting mold 8, so reflects its inner cavity 9, the outer contour of the wax temporary 6 without the arranged in the Wachsprovisoriumsaufnahmeausnehmungen 7 artificial teeth 4 again. The wax provisional 6 can then turn through accordingly

Melting and pouring over the overflow 10 from the

Inner cavity 9 are removed. In such embodiments, it is also conceivable to remove the wax temporary 6 by separating upper and lower mold halves 22 and 23 from the inner cavity 9. The filling of the

Discharge of the liquid wax or the removal of the temporary wax 6 in the inner cavity 9 liberated volume 1 1 to form the prosthesis base 1 with the prosthetic base receiving recesses 3 for the artificial teeth 4 with the plastic or liquid plastic then takes place as described above. After the plastic has hardened, the prosthesis base 1 shown in FIGS. 10 and 11 can then be correspondingly removed from the casting mold 8. The shortening of the artificial teeth 4 can be carried out in the manner described above, as far as necessary. This happens either before the artificial teeth 4 are inserted into the temporary wax 6 or during the casting process without artificial teeth 4 then at the latest before the insertion of the artificial teeth 4 into the prosthesis bases 1 according to FIG. 10 or 11.

To the above-mentioned other alternatives of making the

Wax temporary 6 and then the denture base 1 using the

Wax temporary 6 can be found here in part no additional illustrations.

With regard to the preparation of the prosthesis base 1 on the basis of the temporary wax, in the case of copy milling, suitable copy milling devices are also known in the prior art, such as the copy milling process per se. The same goes for

finally also for the variant in which the temporary wax 6 is scanned and then milled based on this data set the prosthesis base 1 or generated by a generative process. Appropriate

Scanning devices are just as well-known as the milling device shown by way of example in FIG. 1 or the already mentioned apparatuses for carrying out generative production methods. For the sake of completeness are suitable, in the prior art known per se, generative method with which both the wax provisional 6 and the

Prosthesis base 1 can be produced, shown schematically. FIG. 12 shows by way of example the production of a prosthesis base 1 or a temporary wax 6 by means of a 3D plotter or 3D printer known per se. In this case, the printer head 24 successively carries the layers 25 of the corresponding material, ie the wax or the plastic, and thus gradually creates the digitally stored or predetermined shape of the prosthesis base 1 or of the

Wax temporary 6 with the corresponding prosthesis base receiving recesses 3 and wax provisional receiving recesses 7. In Fig. 12 as well as Figs. 13 and 14, the respective already applied layers 25 are shown in solid. The not yet produced, so still to be produced Areas of the prosthesis base 1 and the temporary wax 6 are surrounded by dashed lines.

Fig. 1 3 shows an example of the preparation of a prosthesis base 1 and a

Wax temporary 6 by means of a so-called "selective laser melting" process, which is also known per se In this process, corresponding granules or corresponding powder 28 of the respective material, ie, wax or plastic, are melted by the laser beam 27 of the laser light source 26. During curing, they then form the layers 25. In such a method as shown in FIG. 13, the temporary wax 6 or the prosthesis base 1 to be produced is usually placed on a lowerable base plate 29, so that the distance between the laser light source 26 and the slice 25 to be produced in each case increases as the layers build up It is of course also possible to lift the laser light source 26. The individual layers 25 are formed in any case, as is the case with the printer head 24 according to FIG. 12, in which the regions to be produced are traversed accordingly.

FIG. 14 shows by way of example a third usable generative method for the production of prosthesis base 1 or temporary wax 6. Here, the

Laser beam 27 of the laser light source 26 used to that in a bath 30th

existing resin or resin to form the corresponding layers 25 and thus ultimately the prosthesis base 1 and the temporary wax 6 to cure at the appropriate locations. Again, the component to be manufactured 1 and 6 is located on a lowerable in the bath 30 base plate 29, so again, the distance between the laser light source 26 and each straight

to be produced layer 25 is constant. 13 and 14, the regions of prosthesis base 1 and temporary wax 6 still to be produced by driving off the corresponding shape by means of laser light source 26 or laser beam 27 are also shown by dashed lines. The already applied layers 25 are shown in solid lines. The possibility according to the invention of checking and optionally adapting the fit of the temporary wax 6 prior to preparation of the prosthesis base 1 consists in all variants of the method described here.

FIGS. 4 and 5 as well as FIGS. 8 and 9 each show full dentures 2 for upper and lower jaws. Partial dentures for only partially edentulous upper and / or lower jaw are made accordingly and are not explicitly shown here.

Legend

to the reference numbers: prosthesis base 29 base plate full denture 30 Bad prosthesis base receiving recess

artificial tooth

milling device

wax temporary

Wachsprovisoriumsaufnahmeausnehmung

mold

internal cavity

overflow

volume

casing

flap

tax calculator

treatment cavity

swivel axis

swivel arm

fastening device

axis of rotation

Tool

Tool head

upper mold half

lower mold half

printhead

layer

Laser light source

laser beam

Granules or powder

Claims

claims

1 . Method for producing a prosthesis base (1) made of plastic for a

Dental full or partial denture (2), the prosthesis base (1)

Prosthetic base receiving recesses (3) for artificial teeth (4) and based on a digital data set, which is a form of the

Prosthesis base (1) with the prosthesis base receiving recesses (3) is reflected, characterized in that based on the digital data set first a temporary wax (6) with corresponding wax provisional receiving recesses (7) for the artificial teeth (4) is made and then using the

Wax temporary (6) the prosthesis base (1) is made.

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

Preparation of the denture base (1) the artificial teeth (4) in the

Wax provisional receiving recesses (7) are used.

A method according to claim 2, characterized in that the prosthesis base (1) is made with artificial teeth (4) inserted into the prosthesis base receiving recesses (3) using the temporary wax (6) with artificial teeth (4) inserted in the wax temporary accommodation recesses (7) becomes.

4. The method according to any one of claims 1 to 3, characterized in that the prosthesis base (1) with or without the in the

Prosthesis base receiving extensions (3) arranged artificial teeth (4) using the wax temporary (6) with or without arranged in the wax provisional receiving recesses (7) artificial teeth (4) is produced in a casting process or in a stuffing process.

5. The method according to any one of claims 2 to 4, characterized in that with the wax provisional (6) with or without the artificial teeth (4) arranged therein, a casting mold (8) is produced, the

Inner cavity (9) the outer contour of the wax provisional (6) with or without the in the wax provisional receiving recesses (7) arranged artificial teeth (4) reflects.

6. The method according to claim 5, characterized in that subsequent to the production of the casting mold (8) the wax temporary (6) in the casting mold (8) melted and the resulting liquid wax from the

Inner cavity (9) through overflow openings (10) of the mold (8) is discharged or the wax provisional (6) after production of

Casting mold (8) is taken from this.

7. The method according to claim 6, characterized in that with the

Wax provisional (6) with in the

Wax temporary seating recesses (7) arranged artificial

Teeth (4) the casting mold (8) is made, and the artificial teeth (4) during and after draining the liquid wax or the removal of the wax temporary (6) from the inner cavity (9) of the mold (8) in position be held in the inner cavity (9).

8. The method according to claim 6 or 7, characterized in that by draining the liquid wax or the removal of the temporary wax (6) in the inner cavity (9) vacant volume (1 1) to form the prosthesis base (1) filled with the plastic becomes.

9. The method according to claim 8, characterized in that the artificial teeth (4) when filling the vacant volume (1 1) with the plastic with in the prosthesis base (1) are attached or subsequent to the casting process for the preparation of the prosthesis base (1) in the

Prosthesis base receiving recesses (3) are used.

10. The method according to any one of claims 1 to 9, characterized in that at least a part of the artificial teeth (4) before insertion into the

Wax temporary recesses (7) or the

Prosthesis base receiving recesses (3) in its, in the temporary wax (6) or in the prosthesis base (1) to be arranged area be shortened in advance.