WO2022043201A1 - Procédé et dispositif de raccourcissement de dents artificielles pour prothèses dentaires - Google Patents

Procédé et dispositif de raccourcissement de dents artificielles pour prothèses dentaires Download PDF

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Publication number
WO2022043201A1
WO2022043201A1 PCT/EP2021/073116 EP2021073116W WO2022043201A1 WO 2022043201 A1 WO2022043201 A1 WO 2022043201A1 EP 2021073116 W EP2021073116 W EP 2021073116W WO 2022043201 A1 WO2022043201 A1 WO 2022043201A1
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WO
WIPO (PCT)
Prior art keywords
prosthetic
tooth
prefabricated
cut
prosthetic tooth
Prior art date
Application number
PCT/EP2021/073116
Other languages
German (de)
English (en)
Inventor
Frank-Uwe Stange
Matthias MÖLLER
Stefan Payer
Silke Maren GALL
Karl-Heinz Renz
Original Assignee
Kulzer 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
Application filed by Kulzer Gmbh filed Critical Kulzer Gmbh
Publication of WO2022043201A1 publication Critical patent/WO2022043201A1/fr

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C13/00—Dental prostheses; Making same
    • A61C13/0003—Making bridge-work, inlays, implants or the like
    • A61C13/0004—Computer-assisted sizing or machining of dental prostheses
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C13/00—Dental prostheses; Making same
    • A61C13/0003—Making bridge-work, inlays, implants or the like
    • A61C13/0006—Production methods
    • A61C13/0018—Production methods using laser
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C13/00—Dental prostheses; Making same
    • A61C13/0003—Making bridge-work, inlays, implants or the like
    • A61C13/0022—Blanks or green, unfinished dental restoration parts

Definitions

  • the invention relates to a method for shortening prefabricated prosthetic teeth for dental prostheses.
  • the dental prostheses are made with the shortened prosthetic teeth, the dental prostheses being made in the form of dental partial prostheses or full prostheses.
  • the invention also relates to a method for producing dental prostheses in the form of partial or full dental prostheses, the dental prostheses having a plurality of prosthesis teeth and a prosthesis base as an imitation gum to be placed on a gingiva and the prosthesis teeth being fastened in the prosthesis base.
  • the invention also relates to a device for implementing such a method.
  • Dentures and other dental molded parts such as crowns, bridges and 3-dimensional models of a patient's oral cavity, have been produced for several years using CAD/CAM technologies using subtractive milling processes (CAM - Computer-Aided Manufacturing, German: computer-aided production, CAD - Computer-Aided Design CAD/CAM methods are also increasingly being used in the manufacture and design of dental partial and full dentures with a denture base to rest on the gingiva and denture teeth attached or arranged therein.
  • generative CAM processes such as stereolithography and DLP (digital light processing) are becoming increasingly important for polymer-based dental products such as temporaries, prostheses, orthodontic appliances (orthodontic appliances), bite splints, drilling templates and dental models.
  • the construction is broken down into a “white” tooth portion (the prosthetic teeth) and a colored prosthetic base portion (the prosthetic base).
  • US 2018/0098829 A1 discloses a method for digitally modeling prosthetic teeth.
  • Patent DE 103 04 757 B4 discloses a method for producing dentures in which the teeth are set up virtually in a virtual model and a prosthesis base is produced on the basis of the virtual model.
  • EP 2 742 906 A1 discloses a method in which a dental arch is coated with an impression compound is connected, the impression material being contained in an individualized impression tray and containing an impression of the patient's oral cavity situation. The surface of the mold with the dental arch is digitized and then a virtual model of the dental arch is positioned and oriented as appropriately as possible in the virtual model of the prosthesis base.
  • DE 10 2017 108 592 B4 discloses a method for producing prosthetic teeth with roots aligned parallel to one another for inserting groups of prosthetic teeth in the same direction into a prosthetic base with matching parallel tooth sockets. In this case, an interface to be produced in the prosthetic tooth is calculated as the target geometry, which is then produced in a single work step.
  • DE 10 2018 101 663 A1 describes a method for producing a dental prosthesis in which a wax base for a wax prosthesis and the prosthesis teeth inserted therein are basally machined subtractively, the prosthesis teeth being shortened more than the underside of the wax prosthesis base. For this purpose, indentations are created on the basal side of the wax prosthesis with the prosthesis teeth inserted into the wax base and the prosthesis teeth in the wax base are thus shortened.
  • WO 2016/091 762 A1 discloses a method for producing a dental prosthesis, in which a template is produced with which a plurality of prosthetic teeth can be attached to a prosthetic base in the desired position and orientation relative to one another. The prosthetic teeth are shortened in a cervical area by basal grinding in order to produce the desired bite height.
  • WO 2016/110 392 A1 discloses a method for producing a dental prosthesis, in which a plastically deformable connecting means is introduced into tooth sockets of a prosthesis base in order to enable manual correction of the alignment of the prosthesis teeth in the prosthesis base.
  • DE 102 16 590 A1 discloses a method for producing prosthetic teeth from ceramic by vaporizing or dissolving the ceramic with an ultra-short pulse laser.
  • DE 10 2008 019 694 B3 discloses a method and a device for producing ceramic dental bodies using a laser.
  • the system is not suitable for processing plastic teeth.
  • dental moldings are produced by removing the ceramic from a solid ceramic body with a laser, with the processing being optically controlled during production.
  • the dental moldings are produced in oversize in order to be able to subsequently produce the surface quality that cannot be achieved with the laser.
  • This requires post-processing in the form of precision machining and smoothing.
  • a fiber laser with a high output of more than 500 W is used in the process. This makes safety devices necessary.
  • the one necessary for controlling the incision Scanner optics make the process and setup expensive. Otherwise, clean removal cannot be performed with the vertical focus of the system.
  • prefabricated prosthetic teeth or prosthetic tooth segments are available, but not every application can be realized without changing the product.
  • the prefabricated prosthetic teeth have to be shortened in a cervical area or changed in thickness so that they remain within the defined outer geometries of the future prosthesis and fit well functionally and aesthetically.
  • prosthetic teeth that are positioned in a defined manner with wax can be shortened.
  • the prefabricated denture teeth can also be changed manually, which, however, requires the use of a prefabricated fixation key.
  • Other known methods require subsequent shortening of the teeth used and removal of the protruding areas.
  • WO 2016/069 921 A1 discloses a device and a method for holding prosthetic teeth, in which cervical (basal) machining of prefabricated prosthetic teeth is made possible. Another method for holding prosthetic teeth for the purpose of cervical processing is known from WO 2017/093 432 A1.
  • WO 2017/005 905 A1 proposes processing a set of prosthetic teeth that are fixed in a shrink film. The shrink film must be removed with the CAM device in the areas where the prosthetic teeth are to be processed.
  • a template is known from US 2019/0 167 394 A1, in which the prosthetic teeth to be machined basally are covered at the points that are not to be machined and thus shortened. The exposed areas of the basal ends of the denture teeth can easily be manually milled using the template.
  • the prosthesis base can be manufactured using a generative or subtractive manufacturing process.
  • Prefabricated prosthetic teeth are sufficient as prosthetic teeth Plastic, such as polymethyl methacrylate (PMMA), or individually manufactured prosthetic teeth or dental arches from the same starting materials.
  • tooth sockets must be provided on the prosthesis base for receiving these prosthetic teeth, in which then in a subsequent manual production step, the prosthetic teeth or the dental arches are attached, for example by gluing.
  • the object of the invention is to overcome the disadvantages of the prior art.
  • a possibility is to be found of providing a method and a device with which precise cervical processing of prefabricated prosthetic teeth is possible, which can be carried out as easily, quickly and inexpensively as possible.
  • the mechanical load on the prosthetic teeth should be as low as possible.
  • the mechanical stress should be lower than with conventional milling processes.
  • the surface should be rough enough for gluing in the processed denture teeth after processing.
  • an individual shaping in the cervical area should be made possible, so that the processed prosthetic teeth are indexed in such a way that a clear position and location or the orientation of the machined prosthetic teeth in the prosthetic base is specified.
  • step C) calculating at least one cut surface for separating the cervical volume calculated in step B) to be cut off from the at least one prefabricated prosthetic tooth, the at least one cut surface containing an interface between the cervical volume to be cut off from the at least one prefabricated prosthetic tooth and the remaining prosthetic tooth;
  • step E) Removal of the cervical volume calculated in step B) to be cut off from the at least one fixed, prefabricated prosthetic tooth by at least one cut with a laser beam, the laser beam corresponding to the at least one fixed prosthetic tooth and/or the prosthetic tooth in the holder relative to the laser beam of the at least one calculated section surface in step C).
  • Dental prostheses and thus dental partial dentures and full dentures are intended to replace completely lost teeth. They have at least one prosthetic tooth and a prosthetic base.
  • the denture base is a gum imitation.
  • a denture base can be placed on or attached to a toothless jaw.
  • the prosthetic tooth or teeth serve as a replica lost teeth and should above all restore the chewing function of the jaw as well as the aesthetic impression.
  • a prosthetic tooth has a coronal and a cervical area.
  • the cervical area is located opposite the coronal area.
  • the coronal area includes the biting (occlusal) surface of the prosthetic tooth and the surrounding adjacent lateral areas and is preferably not to be trimmed.
  • the cervical area serves to anchor the denture tooth in the denture base and is arranged basally.
  • the cervical area of a prosthetic tooth can be inserted into a suitable tooth socket in the prosthetic base and connected to it.
  • the plastic is a polymethyl methacrylate plastic or a plastic made from a methacrylate copolymer.
  • the line formed by the laser beam is guided in such a way that the line is the at least one traverses the calculated cutting surface completely, with the line of the laser beam always lying in the cutting surface, in particular over the entire cutting surface.
  • Only one cut is preferably made with the laser beam.
  • the at least one prosthetic tooth can be positioned automatically.
  • the cut surface intersects the cervical axis of the at least one prefabricated prosthetic tooth, preferably the cut surface is perpendicular or nearly perpendicular to the cervical axis. If the cut surface is almost perpendicular to the cervical axis of the at least one prefabricated prosthetic tooth, the cut surface should (on average) be inclined no more than 30° to the cervical axis, preferably no more than 15° to the cervical axis.
  • the cervical axis extends from the coronal end to the cervical end of the prosthetic tooth and preferably passes through the center of gravity of each prosthetic tooth.
  • the tooth height corresponds to the length of the cervical axis within the volume of the prosthetic tooth.
  • the coronal side of the at least one prosthetic tooth is preferably not cut and particularly preferably remains unchanged.
  • the at least one sectional area is realized by at least one sectional plane.
  • step B) a calculation of several cervical volumes to be cut off from several prefabricated prosthetic teeth with a known geometry takes place, in step D) several prefabricated prosthetic teeth are fixed and in step E) the several prefabricated prosthetic teeth are cut with the laser beam, wherein preferably the cutting surfaces are selected in step B) in such a way that each of the prosthetic teeth processed in step E) is given an individual cervical shape.
  • the processing of the at least one prosthetic tooth with laser cuts is thereby made possible or at least significantly easier.
  • the plastic has at least one inorganic pigment and/or at least one inorganic filler.
  • the plastic particularly preferably has up to 5% by weight, very particularly preferably between 1% by weight and 5% by weight, of the at least one inorganic pigment and/or the at least one inorganic filler.
  • a head of a laser for generating the laser beam and/or an optic is moved in order to move the laser beam relative to the at least one fixed prosthetic tooth.
  • the laser beam for producing the step can be guided to produce the desired cut even when the laser is stationary and the at least one prosthetic tooth is stationary.
  • CO2 laser is used to generate the laser beam.
  • the laser beam has a power of less than 1 kW, preferably has a power of between 4 W and 400 W, particularly preferably has a power of between 20 W and 200 W.
  • the power here refers to the power emitted by the laser with the laser beam (beam power) and not to the power consumed by the laser.
  • the at least one prosthetic tooth can be cut quickly and precisely without the surface of the laser cut having to be additionally reworked and without the risk of the processed prosthetic tooth bursting or breaking due to the energy input due to thermal stresses in the material.
  • the at least one prefabricated prosthetic tooth is clamped with the holder.
  • the elastic material must be soft enough so that the at least one prefabricated prosthetic tooth can be manually inserted into the negative mold. In this case, the at least one prefabricated prosthetic tooth cannot be damaged.
  • the objects on which the present invention is based are also achieved by a method for producing dental prostheses in the form of dental partial prostheses or full prostheses, the dental prostheses having a plurality of prosthetic teeth and a prosthetic base as an imitation gum to be placed on a gingiva, the prosthetic teeth being fixed in the prosthetic base, wherein the method comprises one of the methods according to the invention described above and the method additionally comprises a step F): F) Fixing the at least one prosthetic tooth processed in step E) in at least one matching tooth socket of a prosthetic base, with the at least one prefabricated prosthetic tooth preferably being placed in the at least one matching tooth compartment of the prosthesis base is glued in.
  • step E Before the at least one prosthetic tooth machined in step E) is fixed in the prosthetic base, the cut surface produced with the laser beam is not reworked.
  • a device for implementing a method according to the invention having a calculation module for carrying out the calculations of method steps B) and C), a holder for fixing at least one prefabricated prosthetic tooth in a clear position, a Laser for generating a laser beam, a controllable movement device with which the laser beam of the laser can be moved relative to the holder, in that the holder can be moved against the laser and/or the laser can be moved against the holder and/or the laser beam can be moved with the aid of a movable head or a movable lens is movable against the mount, and a controller for controlling a movement sequence of the movement device, so that the laser beam of the laser is movable relative to the mount according to the calculation according to step C) of the calculation module, so that the at least at least one prosthetic tooth fixed in the holder in the clear position is cut on the cervical side with the laser beam according to the cut surface.
  • the device can preferably have an automatic set-up system for changing the prefabricated prosthetic teeth to be trimmed.
  • the movement device can preferably have at least one motor, in particular at least one electric motor.
  • the calculation module is preferably programmed to carry out the calculations of method steps B) and C).
  • the laser is a CO2 laser with a power of less than 1 kW, preferably with a power of between 4 W and 400 W, particularly preferably with a power of between 20 W and 200 W.
  • the power here refers to the power emitted by the laser with the laser beam (beam power) and not to the power consumed by the laser.
  • the at least one prosthetic tooth can be cut quickly and precisely without the surface of the laser cut having to be additionally reworked.
  • the invention is based on the surprising finding that prefabricated prosthetic teeth, which consist essentially of a plastic, can be shortened with a laser beam through cuts in a cervical area in order to achieve the desired bite height and occlusion of a dental prosthesis manufactured therewith.
  • the denture teeth processed with the laser beam are connected to a denture base.
  • the laser beam not only can the cut be made so precisely that fine machining is superfluous, but a surface roughness of the cut surfaces that is particularly well suited for bonding the machined prosthetic teeth is also produced.
  • Indexing of the cervical areas of the prosthetic teeth can also be carried out in a simple manner with the laser beam, so that each of the processed prosthetic teeth only fits exactly to one tooth socket and thus to exactly one position in the prosthetic base.
  • the position of the denture teeth in the denture base can also be specified in this way. This can prevent incorrect positioning and alignment of the prosthetic teeth.
  • a direct precision cut is made with the laser beam to the final dimension and with a high surface quality; removal to the final dimension is not necessary.
  • prefabricated prosthetic teeth comprising PMMA-based plastics with proportions of inorganic pigments and fillers can be cut.
  • the present invention also makes it possible for a laser beam of a laser to move as a cutting laser over the static, prefabricated prosthetic tooth. This advantageously enables direct vertical cuts with the laser beam. It is also particularly advantageous that the incision is predefined and can be implemented precisely according to a stored specification without checking or control measurements.
  • the invention provides a method for prefabricated prosthetic teeth, preferably prefabricated prosthetic teeth made of PMMA and meth/acrylate copolymers, without reducing the disadvantages mentioned with great precision.
  • the prefabricated prosthetic teeth can particularly preferably contain up to 5% by weight of pigments and/or inorganic fillers. With larger proportions of inorganic fillers or pigments, performing the at least one cut with the laser beam becomes more complex, for example because a laser with a higher power has to be used.
  • a laser preferably a CO2 laser, with a power between 20 W and 200 W and a controllable movement device
  • the controllable movement device can be used to position and move the at least one prosthetic tooth against the laser beam or vice versa.
  • the controllable movement device serves as an alignment system and can be implemented, for example, by a robot arm or other 3-dimensionally movable mounts.
  • the prosthetic teeth can be severed with the help of the laser at high speed and with a straight, even cut.
  • the cutting surfaces are precisely defined. There are no mechanical forces that change the positioning of the at least one prefabricated prosthetic tooth in the holder.
  • the surfaces of Cut surfaces are slightly roughened after the cut, which can bring additional advantages when later integrating (e.g. when gluing) into the prosthesis base.
  • the method and the device according to the present invention can be used for a defined on-site shortening in the dental laboratory or alternatively for an industrial shortening at the manufacturer of the prefabricated prosthetic teeth, possibly coupled with a service for individual execution.
  • the laboratory could transmit the required geometries digitally to the manufacturer, who then cuts the prefabricated prosthetic teeth according to the specifications using a method according to the invention and provides the customer with the processed (shortened) prosthetic teeth in the exact form required.
  • FIG. 1 a schematic perspective view of a prosthesis base or a virtual model of a prosthesis base for a full dental prosthesis for the treatment of an edentulous upper jaw
  • FIG. 2 a schematic perspective view of a set of temporary prosthetic teeth or a virtual model of prosthetic teeth for a full dental prosthesis for the treatment of an edentulous upper jaw
  • FIG. 3 a schematic representation of an exemplary device according to the invention for implementing a method according to the invention for shortening prefabricated prosthetic teeth
  • FIG. 4 a schematic plan view of a holder for positioning prefabricated prosthetic teeth
  • FIG. 5 a schematic cross-sectional view of the holder according to FIG. 4 with inserted prefabricated prosthetic teeth, the section running perpendicular to the top view according to FIG.
  • FIG. 6 the sequence of a method according to the invention for shortening prefabricated prosthetic teeth and for producing a dental prosthesis.
  • FIG. 1 shows a schematic perspective view of a prosthesis base 1 or a virtual model of the prosthesis base 1.
  • the prosthesis base 1 can be used to rest or to be attached to the gingiva.
  • the prosthesis base 1 can be designed as an imitation gum.
  • the prosthesis base 1 can consist of a pink colored plastic. The coloring and transparency can be selected to match the appearance of the gums.
  • a multiplicity of tooth sockets 2 for fixing prosthesis teeth (not shown in FIG. 1) can be provided.
  • the prosthesis base 1 can have a palate plate 3 which is framed in a U-shape by the arch simulating the gingiva on the jaw saddle. Accordingly, a prosthesis base for a lower jaw would not have a palate plate 3 and would instead have a recess for the tongue.
  • Figure 2 shows a perspective view of a set of prosthetic teeth 4 or a virtual model of the prosthetic teeth 4.
  • the virtual model of the prosthetic teeth 4 and the prosthetic base 1 can be obtained from a virtual model of a dental prosthesis by splitting the virtual model of the dental prosthesis into the virtual model of the prosthetic base 1 and the virtual model of the prosthetic teeth is computationally separated.
  • the prosthetic teeth 4 can be provided for insertion into the prosthetic base 1 according to FIG.
  • the prosthetic teeth 4 can be present individually, as shown in FIG. 2 and as is preferred according to the invention, so that the prosthetic teeth 4 are then present individually and are not connected to one another.
  • FIGS. 1 and 2 show both the virtual models of the prosthetic base 1 and the prosthetic teeth 4 and a physical prosthetic base 1, which was manufactured using the virtual model of the prosthetic base 1, and physical prosthetic teeth 4, which were based on the virtual model of the prosthetic teeth 4 were shortened using a method according to the invention.
  • the prosthetic teeth 4 or the physical prosthetic teeth 4 shortened using the virtual model of the prosthetic teeth 4 preferably consist of a tooth-colored plastic. Ceramic or inorganic fillers can be contained in the plastic.
  • Each prosthetic tooth 4 can have a coronal side 6 (chewing surface) and a cervical side 8 (basal surface). The cervical side 8 can be glued into the depressions in the prosthesis base 1 formed by the tooth sockets 2 in order to produce the dental prosthesis.
  • the tooth sockets 2 can have an indexing so that the machined prosthetic teeth 4 with a suitable cervical surface can only be in a specific orientation are to be used in the prosthesis base 1 and each processed prosthesis tooth 4 only fits exactly to one tooth socket 2.
  • the tooth sockets 2 can preferably fit the basal counterparts on the cervical side 8 of the machined prosthetic teeth 4 such that the machined prosthetic teeth 4 can be inserted into the depressions formed by the tooth sockets 2 and are held there by an interference fit.
  • FIG. 3 shows a schematic representation of an exemplary device according to the invention for implementing a method according to the invention for shortening prefabricated prosthetic teeth 4.
  • the prefabricated prosthetic teeth 4 are shortened on a cervical side 8.
  • a cervical volume 9 of the prefabricated prosthetic tooth 4 that is to be cut off can be cut off.
  • the device can have a calculation module 10 in which the cervical volume 9 to be cut off is calculated with the aid of virtual models.
  • the prefabricated prosthetic tooth 4 can be positioned using a holder 12 .
  • the holder 12 can have at least one pump 14 , a plurality of suction pipes 16 and a plurality of suction cups 18 .
  • the prefabricated prosthetic tooth 4 can be positioned with the holder 12 during the procedure. It is also possible for the prefabricated prosthetic tooth 4 to be moved with the holder 12 against the rest of the device.
  • the holder 12 can additionally have a robotic arm (not shown) with which the prosthetic tooth 4 can be moved.
  • the device has a laser 20 .
  • the laser 20 can be a CO2 laser with an output power (radiant power) of 100 W.
  • a head 22 for deflecting a laser beam 24 generated by the laser 20 can be arranged on the laser 20 .
  • Movable optical parts of the head 22 or the entire head 22 can be moved with a moving device 26, such as a motor or comprising at least one motor.
  • the laser beam 24 can be moved relative to the holder 12 and the prefabricated prosthetic tooth 4 held therewith.
  • the holder 12 preferably holds the prefabricated prosthetic tooth 4 on a coronal side 6 so that the laser beam 24 does not hit the holder 12 .
  • the movement device 26 can be controlled by a controller 28 so that the sequence of movements of the laser beam 24 is controlled by the controller 28 .
  • the controller 28 is connected to the calculation module 10 .
  • the controller 28 can control the course of movement of the laser beam 24 according to the calculations by the calculation module 10 .
  • the location and position of the prefabricated prosthetic tooth 4 are determined by the holder 12 and are known. It is possible to also measure the exact location and position and use this information from the controller 28 can be used to ensure precise guidance of the laser beam 24 relative to the prefabricated prosthetic tooth 4.
  • the controller 28 may also be connected to the fixture 12 to turn the hold function on and off and/or to move the fixture 12 against the laser beam 24 .
  • a simpler holder 30, as shown in FIGS. 4 and 5 can also be used.
  • the holder 30 can consist of an elastic material such as rubber or silicone or of another easily elastically deformable material such as foam or the like.
  • the elastically deformable material of the holder 30 should at least be dimensionally stable so that the weight of the prosthetic teeth 4 does not lead to such a deformation of the holder 30 that the positions of the prosthetic teeth 4 in the holder 30 change and thus become inaccurate.
  • a plurality of receptacles 32 for receiving prosthetic teeth 4 can be provided in the holder 30 .
  • the prosthetic teeth 4 can be inserted into the receptacles 32 with the coronal side 6 first, with the walls of the receptacles 32 deforming elastically and then resting against the prosthetic teeth 4 laterally again. As a result, the prosthetic teeth 4 can be held in the holder 30 .
  • the recordings 32 are shorter than the tooth height of the prosthetic teeth 4, so that the cervical side 8 of the prosthetic teeth 4 protrudes and can be processed with the laser beam 24. Since no appreciable force is exerted on the prosthetic teeth 24 with the laser beam 24, the prosthetic teeth 4 remain in the desired position. Therefore, a very easily elastically deformable material, such as a foam, can be used as the material for the holder 30.
  • the location and the position of the receptacles 32 in the holder 30 are known and fixed, so that the location and the position of the prosthetic teeth 4 fixed therein are also known.
  • the prosthetic teeth 4 in the holder 30 can be cut precisely with the laser beam 24 and thus shortened.
  • the cervical side 8 protrudes from the holder 30 and can thus be easily processed or cut by the laser beam 24 .
  • the laser beam 24 can be used to cut off the cervical volume 9 to be cut off on the cervical side 8 of the prefabricated prosthetic teeth 4 .
  • a step 34 in the form of at least one kink can be produced. This level 34 can be selected differently for each of the prefabricated prosthetic teeth 4 in order to achieve an indexing of the machined prosthetic teeth 4 that allows the machined prosthetic teeth 4 to be positioned clearly in the prosthetic base 1 .
  • the device can preferably have an automatic set-up system (not shown) for changing the prefabricated prosthetic teeth 4 to be trimmed.
  • An exemplary method is explained below using the device according to the invention described with FIG. The course of the exemplary method is shown in the diagram according to FIG. However, the description can easily be transferred to other exemplary embodiments.
  • CAD data for the shape of a dental prosthesis can be read in.
  • the data can be stored in a memory to which the calculation module 10 and possibly also the controller 28 have access.
  • a data interface (not shown) can be present, via which the CAD data can be read into the device.
  • the CAD model of the dental prosthesis can be generated with the help of virtual models of prefabricated prosthetic teeth, which are positioned in a prosthetic base that matches the oral cavity situation of a patient. Such methods are known from the prior art.
  • a CAD model of the prosthetic teeth 4 and a CAD model of the prosthetic base 1 can be generated from the CAD data that has been read in by means of file splitting.
  • a third work step 102 the shape of the prosthetic teeth 4 according to the CAD model of the dental prosthesis can be compared with the shape of the prefabricated prosthetic teeth 4. From this, the cervical volume 9 to be cut off from the prefabricated prosthetic teeth 4 can be calculated with the calculation module 10 .
  • Prefabricated prosthetic teeth available in different degrees of shortening can also be used.
  • the method can then be used to select from a large number of prefabricated prosthetic teeth of different lengths with the same coronal shape, from which the smallest volume has to be removed cervically.
  • the shapes of the respective prosthetic teeth that are known for these already pre-shortened prosthetic teeth can then be used to implement the method in order to calculate the cervical volume 9 to be cut off from the prefabricated prosthetic teeth 4 .
  • a fourth work step 103 can take place, in which a movement sequence of the laser beam 24 is calculated with the aid of the calculation module 10. A known position and orientation of the prefabricated prosthetic teeth 4 held in the holder 12, 30 is assumed. This data is then used by the controller 28 to control the movement device 26 .
  • a fifth work step 104 the movement device 26 can be controlled with the aid of the controller 28 such that the laser beam 24 separates the cervical volume 9 to be cut off from the prefabricated prosthetic tooth 4 .
  • a sixth work step 105 the prosthetic tooth 4 that has been shortened cervically in this way can be removed. The procedure can be repeated until all prosthetic teeth 4 have been shortened.
  • the method can also be carried out recursively. For example, after the sixth work step 105, the method can be continued with the third work step 102 or with the fifth work step 104 in order to shorten another prefabricated prosthetic tooth 4.
  • the processed prosthetic tooth 4 can then be glued into a suitable tooth socket 2 of a prosthetic base 1 to produce a dental prosthesis.

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  • Health & Medical Sciences (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Dentistry (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Dental Prosthetics (AREA)

Abstract

L'invention concerne un procédé de raccourcissement de dents artificielles préfabriquées, comprenant les étapes suivantes consistant à : • A) produire ou fournir un modèle 3D virtuel d'une prothèse dentaire, au moyen d'un modèle virtuel d'une base de prothèse et d'une dent artificielle usinée (4) ; • B) calculer un volume cervical (9) à découper sur moins une dent artificielle (4) ayant une géométrie connue, en comparant le modèle virtuel de la dent artificielle usinée (4) avec un modèle virtuel d'une dent artificielle préfabriquée (4) au moyen d'un procédé de CAO ; • C) calculer une surface de coupe pour détacher le volume cervical (9) à couper qui a été calculé à l'étape B) ; • D) fixer une dent artificielle préfabriquée (4) au moyen d'une monture (12, 30), la dent artificielle préfabriquée (4) étant constituée, au moins dans une région cervicale, d'au moins 90 % en poids d'une matière plastique ; • E) retirer, de la dent prothétique préfabriquée fixée (4), le volume cervical (9) à découper qui a été calculé à l'étape B), par au moins une découpe au moyen d'un faisceau laser (24).
PCT/EP2021/073116 2020-08-25 2021-08-20 Procédé et dispositif de raccourcissement de dents artificielles pour prothèses dentaires WO2022043201A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020122214.9 2020-08-25
DE102020122214.9A DE102020122214A1 (de) 2020-08-25 2020-08-25 Verfahren und Vorrichtung zum Kürzen von Prothesenzähnen für Dentalprothesen

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DE10304757B4 (de) 2003-02-05 2005-07-21 Heraeus Kulzer Gmbh Vorrichtung und Verfahren zur Herstellung von Zahnersatz
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US20180098829A1 (en) 2012-02-14 2018-04-12 3Shape A/S Modeling a digital design of a denture
WO2013124452A1 (fr) 2012-02-22 2013-08-29 3Shape A/S Réduction et fraisage virtuels de dents artificielles
EP2742906A1 (fr) 2012-12-17 2014-06-18 Ivoclar Vivadent AG Procédé et système de montage d'une prothèse dentaire
US20150289954A1 (en) * 2014-04-11 2015-10-15 Mun Sun Chang Computer fabrication of dental prosthetics
WO2016069921A1 (fr) 2014-10-31 2016-05-06 Ngm Biopharmaceuticals, Inc. Compositions et leurs méthodes d'utilisation pour le traitement de troubles métaboliques
WO2016091762A1 (fr) 2014-12-09 2016-06-16 Heraeus Kulzer Gmbh Procédé pour fabriquer une prothèse dentaire avec un gabarit
WO2016110392A1 (fr) 2015-01-07 2016-07-14 Heraeus Kulzer Gmbh Procédé de fabrication d'une prothèse dentaire
WO2017005905A1 (fr) 2015-07-08 2017-01-12 Heraeus Kulzer Gmbh Dispositif et procédé pour la fixation de dents prothétiques
WO2017093432A1 (fr) 2015-12-04 2017-06-08 Heraeus Kulzer Gmbh Dispositif et procédé pour la fixation de dents prothétiques
DE102017108592B4 (de) 2017-04-21 2018-12-27 Heraeus Kulzer Gmbh Verfahren zur Herstellung einer Dentalprothese mit parallelen Wurzeln der Prothesenzähne
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DE102018101663A1 (de) 2018-01-25 2019-07-25 Kulzer Gmbh Verfahren zur Herstellung einer Dentalprothese

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