WO2008040380A1 - Method for producing a complete dental prosthesis - Google Patents

Method for producing a complete dental prosthesis

Info

Publication number
WO2008040380A1
WO2008040380A1 PCT/EP2006/009711 EP2006009711W WO2008040380A1 WO 2008040380 A1 WO2008040380 A1 WO 2008040380A1 EP 2006009711 W EP2006009711 W EP 2006009711W WO 2008040380 A1 WO2008040380 A1 WO 2008040380A1
Authority
WO
Grant status
Application
Patent type
Prior art keywords
virtual
jaw
model
teeth
aid
Prior art date
Application number
PCT/EP2006/009711
Other languages
German (de)
French (fr)
Inventor
Ralf Bannuscher
Original Assignee
3D Lab Service Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

Links

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61CDENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C13/00Dental prostheses; Making same
    • A61C13/0003Making bridge-work, inlays, implants or the like
    • A61C13/0004Computer-assisted sizing or machining of dental prostheses
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61CDENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C13/00Dental prostheses; Making same
    • A61C13/0003Making bridge-work, inlays, implants or the like
    • A61C13/0006Production methods
    • A61C13/0013Production methods using stereolithographic techniques
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61CDENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C13/00Dental prostheses; Making same
    • A61C13/0003Making bridge-work, inlays, implants or the like
    • A61C13/0006Production methods
    • A61C13/0019Production methods using three dimensional printing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B33ADDITIVE MANUFACTURING TECHNOLOGY
    • B33YADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y50/00Data acquisition or data processing for additive manufacturing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B33ADDITIVE MANUFACTURING TECHNOLOGY
    • B33YADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y70/00Materials specially adapted for additive manufacturing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B33ADDITIVE MANUFACTURING TECHNOLOGY
    • B33YADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y80/00Products made by additive manufacturing

Abstract

The invention relates in particular to an arrangement aid for positioning teeth during the production of a complete prosthesis, comprising partial denture impressions of the teeth forming at least one full denture arch, the partial denture impressions being configured in such a manner that teeth can be inserted in their desired position and desired alignment. The invention also relates to a method for producing such an arrangement aid. The invention finally relates to an at least computer-assisted method for producing a complete prosthesis.

Description

A method for producing a dental prosthesis Total

The invention relates to a method for manufacturing a dental prosthesis Total, further comprising a positioning aid for the positioning of teeth in the preparation of a dental denture and a method for manufacturing the same.

Total prostheses are currently made by a succession purely manual steps. First, the dentist impressions of edentulous mandible and maxilla are taken, which is usually done using a face bow to achieve an exact spatial allocation model for later editing in the articulator. The impressions are then sent to the dental technician and, poured out with a model compound, for example gypsum, to produce corresponding models of the upper and lower jaw. The dental technician sets the jaw models corresponding to the detected using the face bow to the dentist skull-related relations of the upper and lower jaws of the patient in spatial association in an articulator in order to move in this way the lower jaw model and the upper jaw model relative to each other. Then, the dental technician selects a set of artificial teeth, which fits the size according to the types of patients, the jaw models and their spatial arrangement. Subsequently, the individual teeth are manually in sequence with the aid of an adhesive, such as wax, is used on the jaw model and aligned, whereupon the bite of the later cooperating with a mastication teeth is situated. The end result, which is achieved by the interaction of the selection of the set of teeth, the positioning and alignment of the teeth and fine adjustment of the bite, it depends entirely on the skills and dexterity of the dental technician. After a try-this tooth set-up the patient in the dental practice, the work comes back to the dental technician. The models provided with the teeth are removed from the articulator, embedded in a cuvette in plaster and it is a negative model of the respective toothed Kiefermodeiis created. After curing of the adhesive model (wax), the same serving for fixing the teeth in positioning and aligning in the jaw model is removed so that the teeth remain in the negative model. The resulting by removing the adhesive cavity is finally filled with a polymer (plastic). After curing of the plastic, the total prosthesis can be removed from the negative model, to which the negative model is usually destroyed.

A major disadvantage of the tooth setup described in wax, so the above-described procedure is that it is very time consuming and in particular the dental technician demanded a high Mali of skill and dexterity.

In order to overcome these disadvantages, according been 198 38 238 A1 proposed a method of computer-controlled production of dental prostheses for restoration of at least a tooth or a jaw area DE, in which the upper conventionally produced and lower jaw models or parts of this considering the virtual pivot axis of the articulator and specific reference points are digitized, so that the construction of the denture using CAD and fabrication of the dental prosthesis by means of CAM can be performed under computer control below. Disadvantageously, this method is extremely time-consuming and inexact, so that in particular the transmission of the digital present spatial geometry of the dental prosthesis on the virtual design and implementation of digital signals by means of CAM to the finished real dentures is only inadequately possible. But above all, it can not produce a complete denture by this process.

From DE 103 04 757 A1 a similar computer-based method of producing dentures is also known, in which the detected from a measurement device for generating data of a medical part, for example a dental crown, are evaluated. In this method, the formation of the teeth is virtually performed on the computer, wherein the data sets assembled teeth are fitted into a virtual model of the oral situation. From the available data, then the denture base can be produced directly by means of CAM methods; or there is the insertion of the prefabricated teeth into the physical model. In this case, specific structures are provided at the positions of the denture base, where the artificial teeth are set up to ensure a defined spatial association of the einzupolymerisierenden, einzuklebenden or permanently fastened in some other way the artificial tooth. As a specific structure of the preparation of a plateau on the denture base is proposed, which comprises three hemispherical, arranged in a triangle surveys indicate clearly to move in congruent recesses of the tooth base. Another possibility provides for making a ring-like shape which is exactly defined and the geometry of the respective artificial tooth adjusted. In this attachment, the artificial tooth can be inserted, so that the spatial orientation of the tooth based on the Attachment is always constant defined. In the preparation of the denture base formkongruente corresponding recesses are worked out at the respective tooth position or left empty, in turn ensure the accurate and defined positioning of the attachments. This process is also extremely aufwäπdig and ultimately not precise enough to make dentures economically. Above all, however, this method is not suitable to generate a total prosthesis as dentures for edentulous patients with low production times.

The invention is based on the object of developing a computer controlled method and associated apparatus for prosthodontic work while avoiding the aforementioned disadvantages, which are suitable to shorten the production times and optimization of the quality for generating a dental Total prosthesis.

The object is achieved according st by said in the claims and features of the method apparatus features ö gel. This is mainly achieved in that a virtual list of computer-controlled selected teeth is made to the virtual total prosthesis in a virtual image of the articulator taking into account all relevant parameters, which are present as records a computer and a virtual an erection is produced on this basis, in of the maxillary and / or mandibular tooth arrangement are formed as recesses / dental impressions. Based on the virtual positioning aid a real positioning aid, in particular in the rapid prototyping process is then generated and then placed them in the articulator on a holder so that a simple and precise formation of the artificial teeth can be performed, the unprecedented generation speed and accuracy founded in the production of individual dental-full dentures.

Further details, features and advantages of the invention will be described below with reference to an exemplary embodiment with reference to the accompanying drawings. In the drawing:

Figure 1 is a perspective view of a virtual articulator, in which an upper jaw model and the lower jaw model are used.

Figure 2 is a perspective view of a virtual model with computer-controlled determined Total formation.

Figure 3 is a perspective view of a virtual articulator by holding therein an erection.

Figure 4 is a perspective view of a Artikulatorausschnitts having positioned therein an erection aid, are inserted into the teeth.

Figure 5 is a perspective view of the Artikulatorausschnitts shown in Figure 4 with additionally arranged in the upper jaw model..;

6 is a perspective view of a Artikulatorausschnitts having disposed therein an erection aid, are inserted into the teeth, and having inserted therein the lower jaw model. Fig. 7 shows a specific, cooperating with an articulator holder for the above-mentioned positioning aid and

Fig. 8, the erection aid in an overall view with holder and in a partial view from below with Zahnteilimpressioπen for a lower jaw.

Like reference numerals refer to like components below.

According to a preferred embodiment of the method for manufacturing a denture, the steps described in greater detail below are carried out:

First, the dentist marks the maxilla and mandible of edentulous patients are generated (impression taking). Taking the impression is preferably carried out using a face bow through which the exact spatial arrangement of the jaw halves can be detected relative to each other (determination Relations / bite). Based on these marks an upper jaw model and the lower jaw model are generated, for example by overmolding of the prints with a mass of plaster. The jaw models are sent together with the spatial assignment data to a dental laboratory. There, the upper jaw model and the lower jaw model are used based on the spatial mapping data in a conventional articulator such that the spatial assignment of the models corresponding to the actual spatial relationship of the upper jaw and the lower jaw of the patient. Articulators se are known in the prior art, which is why the exact structure is not described in more detail below.

Thereupon, the jaw models in an appropriate measuring device, such as like a laser scanner, a strip light projector or three-dimensionally measured, in particular scanned, and transmit the generated in this way three-dimensional jaw data using an appropriate computer unit and a corresponding processing program in a virtual articulator 10 so that the arrangement shown in Fig. 1 is obtained. Fig. 1 shows a virtual articulator 10 in which a virtual maxillary model 12 and a virtual lower jaw model 14 are arranged, wherein the spatial allocation of the virtual upper jaw model 12 corresponds relative to the virtual mandibular model 14 of those spatial association in the actual articulator.

Based on the detected dimensional data of the virtual upper jaw model 12 and the virtual lower jaw model 14 as well as based on the spatial mapping data of the virtual dental models relative to each other 12 and 14, the data processing program selects now based on predefined in the data processing program criteria a set of artificial teeth of a plurality of sets of teeth of which is best suited for producing the full denture in size and shape of the individual teeth. After selecting the set of teeth are, as shown in Fig. 2, the individual virtual teeth 16 of the selected set of teeth positioned using defined algorithms in the virtual dental models 12 and 14, and aligned with, whereby a virtual prosthesis 18 is produced. The algorithms used are created from dental / dental parameters and stored in the data processing program.

Based on the virtual prosthesis 18, more precisely, based on the position data of the virtual teeth 16, will now automatically generates a virtual erection aid 20 through appropriate algorithms, as shown in Fig. 3. The virtual erection aid 20 is formed like a plate substantially and includes tooth part imprints of the virtual teeth 16. In the illustrated in Fig. 3 virtual tooth part imprints 22 is that of the virtual teeth 16 of the virtual upper jaw 12. In the same plate 20, the virtual tooth portion footprints 36 of the virtual mandible 14 is formed (not visible in Fig. 3). The impressions include the positioning of future occlusion. The virtual erection aid 20 may optionally comprise both the virtual tooth imprints part 22 of the virtual upper jaw model 12 as well as those of the virtual mandibular model fourteenth Alternatively, each having a separate positioning aid can be generated for the virtual tooth imprints part 22 of the virtual upper jaw model 12 and 36 for those of the virtual Uπterkiefermodells fourteenth The three-dimensional data generated in this way virtual erection aid 20 will now be a three-dimensional printing device, preferably a rapid prototyping Eiπrichtung supplied, which generates from the data of the virtual positioning aid 20 in the layered construction of an actual erection aid 24th The aforementioned devices for generating the actual erection aid 24 are known in the art and are therefore not explained in detail. Alternatively, it is of course also possible, for example, to supply the three-dimensional data of the virtual positioning aid 20 a milling center or the like which ausfräst the actual erection aid 24 consists of a block of material.

Under assumption of the exact spatial arrangement of the virtual positioning aid 20 in the virtual articulator 10, as shown in Fig. 3, the actual erection aid is used in an actual articulator 26 24, which is done using a positioning device in the form of a holder 28, which separately is shown in Fig. 7 and Fig. 8. The holder 28 has a base plate 38 which can be releasably connected to the Artikulatorfuß. On the pedestal 38 40 sits a telescope connector having a Zyliπderstift 42, which is provided in millimeter intervals with annular grooves for axial adjustability. With a fixing screw 44 determining the height position takes place. At the upper end of the holder 28 a seat for the fastening of the plate-shaped positioning aid 24 is provided, which is fixed by means of a locking screw 46 on the holder in the exact position, see Fig. 8. In the actual tooth part footprints for the maxilla and mandible of the actual Installation aid 24, shown in Fig. 8 above for the teeth of the upper jaw and below for the teeth of the lower jaw are now arranged actual artificial teeth 30, wherein the actual teeth 30 by the insertion into the actual tooth portion prints the actual erection aid 24 are automatically positioned and aligned, see Fig. 4.

As shown in Fig. 5, an actual upper jaw model is used in the actual articulator 26 32 then, and the actual erection aid 24 and the actual upper jaw model 32 are moved toward each other such that the actual teeth 30 is mounted using an adhesive material at the actual upper jaw model 32 become. In the same manner and the corresponding actual lower jaw model 34 is provided with actual teeth, which is schematically shown in Fig. 6.

Starting from the actual teeth provided with actual jawbone models in a total prosthesis can now be produced in a conventional manner.

An advantage of the method according to the invention for preparing a total prosthesis is that substantial method steps are computerized. In particular, the time-consuming positioning and alignment of the teeth in the upper or lower jaw model, and are generally done manually by the dental technician, and the same without the expertise and manual dexterity is hardly possible according to the invention automatically by computer control a positioning aid is generated, which shape and size defines the teeth, the positioning and the alignment of the teeth in the corresponding jaw models. In order to manufacture using the method of the invention a total prosthesis, the appropriate person only needs to be able to position the jaw models produced at the dentist properly in the articulator and to use the appropriate data processing program. In other words, the method can also be performed by a person who does not have the skill of a dental technician.

It should be clear that the embodiment of erfiπdungsgemäßen procedure described above is in no way limiting. Rather, modifications and changes are possible without departing from the scope of the present invention, which is defined by the appended claims.

LIST OF REFERENCE NUMBERS

10 virtual articulator

12 virtual maxillary model

14 virtual mandibular model

16 virtual teeth

18 virtual prosthesis

20 virtual setup aid

22 virtual tooth-part footprints

24 actual erection aid

26 actual articulator

28 positioning

30 actual teeth

32 actual maxillary model

34 actual mandibular model 6 virtual tooth part footprints lower jaw 8 telescopic base plate connector 2 0 4 cylinder pin fixing screw 6 fixing screw

Claims

P atentanspr ü che
1. A method for computer-assisted production of a denture as dental prostheses for toothless patients with the following method steps:
Molding the edentulous maxilla and mandible, preparation of the models, as well as assignment of these to each other, in particular in a conventional manner in an articulator,
Determining the geometry of the models in their association with each other in a measuring device, preferably by 3D scanning, and creating a three-dimensional representation or a corresponding digital data set in the form of virtual models,
Inputting the data set in a computer program, whose database contains the tooth shapes used for the manufactured full denture and after dental parameters selects the teeth of the prosthesis taking into account individual geometries and virtually establishes the total prosthesis,
Computer-aided design of a virtual positioning aid, in which the tooth statements in the form of part-tooth recesses or partial dental impressions are formed,
Production of a real set-up aid,
Inserting the artificial teeth into the corresponding recesses or impressions of the erection aid,
Connecting the erection aid protruding from the free standing regions of the artificial teeth with a soft layer of wax or similar adhesive material with the associated jaw model or both jaw models,
Removal of an erection and completion of the denture in a conventional dental manner.
2 A method according to claim 1, characterized in that the metrological detection of the model geometries is made by 3D scanning or by the method of light projection.
3. A process according to claim 1 or 2, characterized in that the calculation of the position and orientation of the teeth for the virtual total prosthesis is made based on stored in the computer unit algorithms.
4 A method according to any one of claims 1 to 3, characterized in that the alignment of the upper and lower jaw model is made to each other using an articulator that COMPLETE measurement data by 3D scanning are determined and the resultant data is copied into a software that a having virtual articulator and after dental and technical dental parameters makes the selection tooth and the tooth positions for the denture determined and then constructs the erection aid.
5. The method according to any one of claims 1 to 4, characterized in that the actual positioning aid is produced using a three dimensional printing technique or a rapid prototyping technique
6 A method according to any one of claims 1 to 5, characterized in that the actual positioning aid is made of a plastic material
7. positioning aid for positioning artificial teeth in the manufacture of a total prosthesis, in particular for carrying out a method according to one or more of claims 1 to 6, characterized by a mounting plate (24) in the Zahnteilausnehmungen (22) or teeth member imprints the at least one Gebißhalfte forming artificial teeth (30) are formed such that the artificial teeth (30) can be inserted in its desired position and orientation target in this
8. Installation aid according to claim 7, characterized in that the mounting plate (24) having a holder (28) is releasably connectable to the positionally accurate arrangement in an articulator (26).
9. carries erection aid of claim 8, characterized in that the holder (28) is axially adjustable via a screw (46) the mounting plate (24).
10. Installation aid according to one of claims 7 to 9, characterized in that the mounting plate (24) with inserted artificial teeth (30) in the articulator (26) to the maxillary or mandibular model (32, 34) in a predetermined position in particular with the aid of wax or another adhesive material is connectable.
11. Installation aid according to claim 10, characterized by a moving device that moves the positioning aid and the jaw model relative to each other to depress the positioning aid of the projecting tooth portions in a predetermined manner in the adhesive mass of the model.
12. Installation aid according to one of claims 7 to 1 1, characterized in that it consists of a plastic material.
13. Installation aid according to one of claims 7 to 12, characterized in that it is built up in layers by means of the 3D Printings or rapid prototyping.
14. A method for manufacturing a positioning aid according to any one of the preceding claims, characterized by the following process steps:
Molding of the upper jaw and the lower jaw of a patient;
Generating an upper jaw model and a lower jaw model; Aligning the upper jaw model and the lower jaw model to each other;
Detecting the positions of the aligned upper jaw model and the lower jaw model aligned based on position coordinates;
Insertion of the upper jaw model and / or the lower jaw model in a measuring device for scanning the corresponding jaw model;
Generating a virtual jaw model;
Identifying the position coordinates in the virtual jaw model;
Calculating the position and orientation of the teeth for the corresponding virtual jaw model based on stored in a computer unit algorithms;
Generate a virtual setup aid based on the virtual jaw model and the calculated position and orientation data of the teeth;
Create an actual erection aid based on the generated for the virtual setup aid data.
15. The method according to claim 14, characterized in that, based on stored in a computer unit algorithms further comprises a set of teeth of a plurality of respective sets is selected.
16. The method of claim 14 or 15, characterized in that the alignment of the upper jaw model and the lower jaw model is carried out to each other using an articulator.
17. The method according to any one of claims 14 to 16, characterized in that the jaw model is detected using a Laserscaππers or a strip light projector.
18. The method according to any one of claims 14 to 17, characterized in that the actual positioning aid is generated using a three-dimensional printing technique or rapid prototyping technique.
19. A method according to any one of claims 14 to 18, characterized in that the actual positioning aid is made of a plastic material.
20. Installation aid according to one of claims 1 to 7, characterized by a virtual mounting plate (20) in the form of individual, corresponding to the patient anatomy virtual design, in which the tooth statements in the form of part-tooth recesses or partial dental impressions are formed, and a based thereon identical real mounting plate (24) with corresponding Zahnteilausnehmungen (22/36) or tooth part impressions, in which the artificial teeth (30) are insertable.
PCT/EP2006/009711 2006-10-07 2006-10-07 Method for producing a complete dental prosthesis WO2008040380A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2006/009711 WO2008040380A1 (en) 2006-10-07 2006-10-07 Method for producing a complete dental prosthesis

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PCT/EP2006/009711 WO2008040380A1 (en) 2006-10-07 2006-10-07 Method for producing a complete dental prosthesis
PCT/EP2007/002413 WO2008040400A1 (en) 2006-10-07 2007-03-19 Method for producing a prosthetic component for use in dentistry

Publications (1)

Publication Number Publication Date
WO2008040380A1 true true WO2008040380A1 (en) 2008-04-10

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Application Number Title Priority Date Filing Date
PCT/EP2006/009711 WO2008040380A1 (en) 2006-10-07 2006-10-07 Method for producing a complete dental prosthesis
PCT/EP2007/002413 WO2008040400A1 (en) 2006-10-07 2007-03-19 Method for producing a prosthetic component for use in dentistry

Family Applications After (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/002413 WO2008040400A1 (en) 2006-10-07 2007-03-19 Method for producing a prosthetic component for use in dentistry

Country Status (1)

Country Link
WO (2) WO2008040380A1 (en)

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WO2017066935A1 (en) * 2015-10-21 2017-04-27 北京大学口腔医院 Oral maxillo-mandibular relationship reestablishment aid device, reestablishing method and device

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