EP2299928A1 - Verfahren zur ermittlung von 3d-daten von zumindest einem präparierten kieferbereich - Google Patents
Verfahren zur ermittlung von 3d-daten von zumindest einem präparierten kieferbereichInfo
- Publication number
- EP2299928A1 EP2299928A1 EP09741953A EP09741953A EP2299928A1 EP 2299928 A1 EP2299928 A1 EP 2299928A1 EP 09741953 A EP09741953 A EP 09741953A EP 09741953 A EP09741953 A EP 09741953A EP 2299928 A1 EP2299928 A1 EP 2299928A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- prepared
- dental instrument
- jaw
- jaw area
- data
- Prior art date
- Legal status (The legal status 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 status listed.)
- Ceased
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C9/00—Impression cups, i.e. impression trays; Impression methods
- A61C9/004—Means or methods for taking digitized impressions
- A61C9/0046—Data acquisition means or methods
-
- 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
Definitions
- the invention relates to a method for determining 3D data of at least one prepared jaw area such as prepared tooth stump by mechanical scanning of the jaw area and digitizing the measured values determined during scanning.
- EP-A-0 580 565 discloses a method for producing a dental prosthesis consisting of ceramic material.
- a prepared tooth can be recorded optically or mechanically in the mouth of a patient in order then to produce the tooth replacement from the values thus determined and digitized by means of a milling machine.
- the present invention is based on the object, a method of the type mentioned in such a way that with simple measures required for the production of dental prosthesis 3D data can be determined without elaborate scanning process or the production of a positive model are needed.
- the invention essentially provides that the jaw area to be prepared, such as tooth stump, is prepared with a dental instrument whose positions are optically measured during the preparation and the 3D data are determined from the positions of the dental instrument assigned to the prepared jaw area.
- the position data of the dental instrument during the preparation of the jaw area are used for the final contour determination of the prepared jaw area.
- the jaw area is simultaneously scanned tactilely during preparation in order to provide the required digitized measured values after completion of the dissection in order to be able to produce a dental prosthesis.
- the dental instrument is a drill for preparing the jaw area.
- the dental instrument should consist of a handle such as a handle and a replaceable insert, the z. B. is a drill.
- the handle should have markings so that one and the same handle can be used for different applications or tools. During a change of use, the different effective geometry of the inserts must be taken into account or calibration must be carried out.
- the dental instrument is calibrated prior to preparation by scanning a standard such as a ball. Measures relating to this are well known from coordinate metrology in connection with the tactile measurement of workpieces, so that reference is made to the related prior art measures and expressly incorporated by reference.
- the positions of the dental instrument are determined taking into account any movement of the jaw area.
- the movement data of the dental technical instrument are offset with the movement data of the jaw in order to be able to calculate the 3D data set.
- the jaw region can be assigned a position sensor which is arranged in a stationary manner.
- the position sensor may include the optically effective markings assigned to the jaw region and an optical sensor which detects the movement of the markings.
- an inertial platform for position determination can be used, whose data are offset with those of the optical sensor, by means of which the movements of the dental instrument are detected.
- light sources such as LEDs or optical reflectors are used for the first and / or second optically active markers.
- the optical sensor such as a camera
- the 3D data corresponding to the prepared jaw area are then processed by means of software, in particular CAD software, to produce a dental prosthesis which can be fitted on the jaw area, and then by means of a CAM program from a blank, in particular consisting of porous or pre-sintered ceramic to produce desired dentures. This is basically done by milling. Alternatively, however, it is also possible to produce the dental prosthesis on the basis of the 3D data in a constructive procedure such as rapid prototyping.
- the inner contour of the dental prosthesis is determined from the 3D data and outer contour determined by the position determinations of the dental instrument by scanning the digitized data and / or a library of the jaw region surrounding the dental area to be provided with the dental prosthesis or calculated.
- a rotating tool such as a drill is used as the dental instrument, in which the receptacle or handle of the rotating tool has at least three optical markings, such as light-emitting diodes, which are detected by a receiver so as to detect the spatial position of the tool. Due to the interchangeability of the rotating tool, when using a new rotating tool, it is necessary to measure or teach on a normal, such as a reference ball.
- an envelope is formed during the preparation, which corresponds to the shape of the prepared jaw area such as tooth stump.
- the movement of the patient is additionally taken into account in order to avoid measurement errors.
- the method according to the invention is used for the production of copings, a framework or an inlay. An extremely precise contour determination takes place.
- a change in performance of the tool can be used, which occurs when the drill comes in contact with the jaw area to be prepared and processing begins.
- a drill as a dental instrument
- the movement of a rotating tool guided by the grooming and dentist is detected.
- several optical markings such as LEDs are attached to it or its holder.
- the calibration of the tip of the rotating tool to the optical marking is performed by probing a normal as reference ball at several positions.
- a platform with at least three optical markings or an intertial platform is connected to this stationary.
- the jaw movement sensing sensor may be attached to a face leading to the jaw or in a bite block placed between the lower and upper jaws.
- the jaw movement can be detected by the optical sensor, which detects the movement of the dental instrument.
- the dental instrument scans the areas of the jaw area not intended for processing during the treatment phase, such as at least one tooth and, if necessary, required parts of the alveolar ridge. This results in data that can be used for the outer contour calculation of a prosthesis to be produced.
- the preparation boundary is determined using a separate probe or an insert such as stylus that can be equipped with the dental instrument or its handle.
- a dental instrument used to prepare a jaw area is simultaneously used as an oral scanner.
- Fig. 1 is a schematic diagram for explaining the inventive
- FIG. 2 is a schematic diagram of a tooth to be prepared
- Fig. 3 is a schematic representation of a fictional blank at the beginning of the preparation of the tooth of Fig. 2 and
- FIG. 4 shows the fictional blank of FIG. 3 after partial preparation of the tooth according to FIG. 2.
- FIG. 4 shows the fictional blank of FIG. 3 after partial preparation of the tooth according to FIG. 2.
- a tooth 10 to be prepared is chosen as the jaw area. Such is the Fig. 2 can be seen.
- the enamel 12 is to be removed in a circumference that a stump remains on the z.
- a coping for a prosthesis such as bridge is attached.
- a rotary tool also referred to as a grinding pin, hereinafter referred to as a drill 16
- a drill 16 which starts from an instrument holder 18 or can be inserted interchangeably into it, which is guided in the usual way by a dentist who guides the preparation performs.
- a final contour determination takes place simultaneously with the preparation of the tooth 10, that is, a determination of the geometry of the surface of the tooth stump 14. Accordingly, processing and scanning are performed simultaneously in order to provide 3D data of the tooth stump 14 after completion of the processing to have due to which a dental prosthesis can be produced.
- the holder 18 has at least three optical markings 20, 22, 24, in which it is z. B. can act to LEDs. These are detected by a stationarily arranged optical sensor 27 so as to determine the spatial position of the holder 18. This points to the drill 16, d. H. its tooth 10 or the enamel 12 erosive tip 26 a unique position, so that from the spatial orientation of the holder 18 and the spatial position of the drill bit 26 is determined.
- a calibration of the holder 18 to be designated as a dental instrument 28 with a drill 16 is carried out in advance. This is done in a way that is the case with tactile coordinate measuring machines, in which the sensor emanating from a holder is calibrated on a standard such as a calibration ball.
- the spatial coordinates of the holder 18 and thus the drill bit 26 are determined via the optical sensor 27 and fed to a computer 30 to recover with this data by means of software such as CAD software data of a reconstruction, by means of z , B.
- a CAM software Processing machine 30 is controlled with the z. B. by milling from a blank 33 of the prepared on the prepared stump 14 dentures such as copings is made.
- the blank 33 may be made of at least one mixed oxide powder selected from the group consisting of Al 2 O 3 , TiO 2 , MgO, Y 2 O 3 and zirconia mixed crystal, and may be a presintered body.
- the inner contour of the tooth replacement is determined by the space determination of the holder 18 and thus of the drill bit 26.
- at least areas of the outer contour of the dental prosthesis to be produced can be determined by following this region of the jaw adjacent the tooth stump 14, in particular in the region of the preparation margin, ie in the immediate vicinity of adjacent teeth. Remaining data can be taken from a library.
- FIG. 3 a space volume designated below as a fictitious blank 34 is shown, within which the data of the spatial coordinates of the tooth replacement to be produced lie completely, which consequently corresponds to a point cloud.
- the drill bit 16, ie the drill bit 26 descends along the preparation boundary 15 of the tooth 10 to be machined, so that a notch 36 is machined in the notional blank 34, the circumference of which swandung which corresponds to the stump 14. Accordingly, regions or coordinate values are removed from the volume of space and thus the point cloud.
- the sides of the tooth 10 are machined to obtain a contour 38 from the blank 34 corresponding to the tooth stump 14.
- the occlusal region of the tooth 10 is machined, that is to say the region 40 shown in FIG. 4.
- the resulting envelope of the imaginary blank 34 represents the 3D data of the prepared tooth stump 14 which is used to produce the inner contour of a prepared tooth stump 14
- To be applied dentures are processed in a software. If, according to the explanations given above, preparation takes place from the preparation boundary, the invention is not restricted thereby. It can also be prepared from top to bottom. Regardless of this, however, after preparation, ie after completion of this, the preparation boundary 41 should be recorded separately, with a standing, so non-rotating tool. For this purpose, the drill 16 can be turned off. A separate probe can also be used to tactilely measure the preparation margin.
- teaching according to the invention can also be used if a standard abutment having a reference surface is already used in the jaw area. In this case, it requires only a tactile scanning of the reference surface to produce a positionally accurate positioning dentures; because in the case of an implant restoration with a standard abutment (artificial tooth stump), the data of the artificial crown (abutment) carrying the future crown are known.
- a sensor or parts of a sensor are positioned fixed to the jaw in order to match the movement data with the spatial coordinates of the dental instrument 28 to settle. It can be provided that z. B. via a face strap 42 or a bite block an inertial platform 44 is fixed to the jaw, via which the movement of the jaw to the sensor 27 and thus to the drill 16 and the tip 26 is determined. However, it is also possible to position fixed to the jaw according to the markers 20, 22, 24 optical markers, which are then also detected by the sensor 27. It goes without saying Make sure that the respective groups of markers emit optical radiation with wavelengths to be differentiated.
- another optical sensor calibrated to the position of the sensor 27 can also be used to take account of the jaw movement.
- the preparation margin is scanned.
Landscapes
- 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)
- Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008002845 | 2008-05-08 | ||
PCT/EP2009/053955 WO2009135735A2 (de) | 2008-05-08 | 2009-04-02 | Verfahren zur ermittlung von 3d-daten von zumindest einem präparierten kieferbereich |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2299928A1 true EP2299928A1 (de) | 2011-03-30 |
Family
ID=40823006
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09741953A Ceased EP2299928A1 (de) | 2008-05-08 | 2009-04-02 | Verfahren zur ermittlung von 3d-daten von zumindest einem präparierten kieferbereich |
Country Status (3)
Country | Link |
---|---|
US (1) | US8986009B2 (de) |
EP (1) | EP2299928A1 (de) |
WO (1) | WO2009135735A2 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3673861B1 (de) * | 2008-04-02 | 2022-12-07 | Neocis, Llc | Geführtes zahnimplantationssystem |
EP2299928A1 (de) * | 2008-05-08 | 2011-03-30 | DeguDent GmbH | Verfahren zur ermittlung von 3d-daten von zumindest einem präparierten kieferbereich |
WO2019008585A1 (en) * | 2017-07-04 | 2019-01-10 | Dentlytec G.P.L. Ltd | GUIDED DENTAL MEASURING DEVICE |
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2009
- 2009-04-02 EP EP09741953A patent/EP2299928A1/de not_active Ceased
- 2009-04-02 WO PCT/EP2009/053955 patent/WO2009135735A2/de active Application Filing
- 2009-04-02 US US12/991,191 patent/US8986009B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
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None * |
Also Published As
Publication number | Publication date |
---|---|
US8986009B2 (en) | 2015-03-24 |
US20110111360A1 (en) | 2011-05-12 |
WO2009135735A2 (de) | 2009-11-12 |
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