EP2118790A1 - Method for modelling or producing a denture supply, machine-readable data carrier, and computer - Google PatentsMethod for modelling or producing a denture supply, machine-readable data carrier, and computer
- Publication number
- EP2118790A1 EP2118790A1 EP20080701051 EP08701051A EP2118790A1 EP 2118790 A1 EP2118790 A1 EP 2118790A1 EP 20080701051 EP20080701051 EP 20080701051 EP 08701051 A EP08701051 A EP 08701051A EP 2118790 A1 EP2118790 A1 EP 2118790A1
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- Patent type
- Prior art keywords
- 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.)
- 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
- A61C5/00—Filling or capping teeth
- A61C5/70—Tooth crowns; Making thereof
- A61C5/77—Methods or devices for making crowns
- G06—COMPUTING; CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/50—Computer-aided design
METHOD FOR MODELING OR PRODUCING A MEDICAL SUPPLY, COMPUTER READABLE MEDIA AND COMPUTER
The invention relates to a method for modeling or producing a dental prosthesis, as well as a corresponding computer readable medium and a computer.
It is known, various tooth replacement parts such as crowns or bridges to model with a CAD process. Here, to resort to a set of data representing the shape of a tooth area, of a residual tooth area, a gum area or the like with which the dental prosthesis is to be connected.
In the model a dental supply must be taken to ensure sufficient stability of the denture care, because the forces acting on chewing on the dental care, are usually very large.
Moreover, there is a desire in the rule that a dental supply ensures the most natural look. For this purpose, for example, delusions of bridges are known, which have a tooth-colored hue.
The object of the present invention is to provide an improved method for modeling a dental prosthesis, a corresponding computer readable medium and a computer, and thus to provide an improved dental prosthesis supply.
This object is achieved with a method according to claim 1 or 11, a computer-readable medium of claim 17 and a computer according to claim 18th
Advantageous embodiments are disclosed in the dependent claims.
In the method, a record is taken into account that detects the shape of the patient baseline. For attaching a dental prosthesis is usually one or more treatments are carried out in which, for example, teeth or implant post to be ground or teeth are extracted. The grinding of teeth or implant post serves to create space and corresponding support points for a dental prosthesis.
Thus, before such grinding or extraction of teeth or other treatments take place, the form of a starting position is detected with a record, so that the form of this output situation can be then used in the modeling of the dental prosthesis.
This makes it possible to create dental care, see similar as possible to the original starting position, so that the original look can be restored before the treatment and the onset of dental care.
The two data sets give the shape preferably in three dimensions again, that it is given a three-dimensional image of the current situation and / or the situation after treatment. As a rule, for example, the surface data to be stored in the space in the data sets.
The process is preferably a CAD (computer-aided design) method.
Furthermore, a second record is used which detects the situation after treatment, since a corresponding dental prosthesis or a part of the dental prosthesis can be modeled with this record. For example, by the shape of a ground-down tooth, the inner shape of a crown, a bridge, a coping, of a cap, a prosthesis, an inlay, an onlay, an overlay or similar tooth replacement supplies can be specified.
The first data set that detects the shape of the initial situation, can be used, for example, to be displayed in the modeling of the dental prosthesis. The record thus serves an operator of appropriate software as a guide to where and how to form a dental supply.
Preferably, the representation is done in superposition with the second data set (or a segment thereof, the enlarged views allowed), which reflects the actual situation of the patient.
In the modeling of denture supplies, it is possible to operate the service through a software automatic selection of predetermined shape records. For example, an automatic proposal of a suitable abutment, an artificial tooth or the like can be selected for a missing tooth. If there are several predetermined shape data sets are available for a particular tooth position, such may be chosen, a dental prosthesis allows taking into account of the first record which is as similar as possible to the original situation.
In addition to the criterion of similarity to the initial situation, a further criterion can be used namely the ideal situation a, d, h. a dental supply that creates an ideal shape in terms of aesthetics in a given patient. A simulation of such an ideal supply or also the simulation of another supply may additionally or alternatively semi transparent to the output data set and / or in one or hideable shown. This simulation of an (ideal) supply can be created in consideration of jaw dimensions, tooth size, stored dimensions and / or shapes and / or models corresponding to an ideal supply. It is preferably automatically generated by the software, but can also be created by a user of the software and / or modified. An ideal supply from an aesthetic point of view may be for example one in which the selectable sizes or shapes average values correspond (from a correspond to number of people), as these forms are considered aesthetically pleasing in a rule.
The criteria of similarity with the initial situation and the ideal supply can also be used with variable weights for selecting the form of data sets. This allows you to easily create an operator a dental prosthesis that is similar to the one side the original appearance, on the other hand is an aesthetic improvement, as an ideal supply is approximated at least to some extent.
When you choose the form of records or in the modification of such, it is also advantageous if the option is granted by remote data transmission means of an external person as the patient or a dentist to look at various modeling the denture care. Thus, various models can be created with that resemble more or less a starting point and / or an ideal supply, so that the patient or dentist (thus generally any external person) can select one of these models. Another possible factor in the selection of a proposal is the stability of Zahnersatzversorguπg. This can be calculated with a finite element method or simulated. Stability can also be considered as gewichtbares criterion. But it can also be only the effect takes into account that a predetermined minimum stability is to be achieved.
Also a modification of such a record can be automatically performed for automatically selected form records or if only one form of record due to the tooth position is concerned, in order to optimize it for example in the size, length, width, height, or the like. Also, such modifications can be made in consideration of the first data set and / or a simulation of an ideal power supply and / or stability aspects.
Automatic modifications can be made in consideration of stored empirical values that specify, for example, must remain as much space for a tooth veneer.
A first data set can be created by scanning the initial situation to the patient or a model of it. So scanners are conceivable, for example, the scan directly into the oral cavity of the patient, the initial situation, but there are also scanners conceivable that (for example, a plaster model) scanning a model of it. For this purpose, an optical scanner or a mechanical probe may be provided.
The second data set can be obtained directly at the patient's mouth or a model of it.
Regardless of when, where and how the records are created, the procedure can be performed only by loading such records. Thus, the scanning can be carried out at a dentist or a dental technician, for example, whereas the method in a dental technician or dental prosthesis manufacturer, such as a machining center or other production center for dental prosthesis to be performed.
As a tomograph scanner, such as a computer tomograph can (also CT scanner), an X-ray scanner, an NMR scanner, an optical scanner, a scanner, or any other, a mechanical probe may be used. The different data sets can be sent by remote data transmission. This allows performing different steps in different places.
The dental prosthesis can be manufactured with a rapid prototyping process and / or a CAM process. Rapid prototyping methods are those molding method, constituting the workpiece, preferably in layers from formless or form materials using physical and / or chemical effects. These methods include, for example, stereolithography, selective laser sintering, laser generation, fused deposition modeling, laminated object modeling, 3-D printing, contour crafting, multi jet modeling or Polyjet method. Among the CAM methods include, for example, the rapid prototyping process or milling.
In a particular advantageous embodiment of the method, the color output situation of the situation is detected. To this end, a scanner can be provided which detects the color of teeth and gum, or otherwise. The color can be individually for each tooth or the situation as a whole recorded. Since the teeth or gums in general have also gradients, this can also be detected with preferably. The color situation can (also) be detected with spatial resolution.
Such a situation can be detected color displayed together, for example, with the first record. This takes place in that a surface that reflects the first record is displayed in the appropriate color according to the color situation.
The color situation can be considered in the modeling of the dental care. For example, a desired color and / or color design may already (a gradient with, for example) of the dental prosthesis are specified and stored in the modeling.
Accordingly, it is then advantageous if the color situation is taken into account in the production of dental prosthesis, or the information that was generated in modeling related to. The color is taken into account in the manufacture of the dental prosthesis.
A record that reflects the color situation of the initial situation can also be sent by remote data transmission, so that different steps in different places by different people can be carried out. Eg, can a modeled dental prosthesis to be produced in a manufacturing center for dentures supply then the color situation is sent to the, so that he is the z veneering and the dental prosthesis produced (for example by a bridge construction is produced) can be sent to a dental technician. B. Bridge can make with such colors as possible, preferably similar to that of the initial situation.
Preferred embodiments of the invention will be explained with reference to the accompanying figures. In which:
Figure 1 is a schematic view of a starting position and a situation after the treatment,
Figure 2 is a schematic representation of a computer,
Figure 3 is a schematic representation of data records and dentures supplies,
4 shows various sectional views of a starting position,
Figure 5 different sectional views of a situation after treatment,
Figure 6 is a schematic view of a superimposition of two data sets.
1a shows a starting situation is schematically shown. In a gingival region 6 has three teeth 3, 4, 5 can be seen. This initial situation 1 corresponds to that situation which exists before starting with the treatment for the dental prosthesis.
Figure 1 b shows the state after such treatment. Here, the tooth has been extracted, the teeth 4 and 3 and 5 have been ground. Thus, there remain tooth stumps 3 ', 5' and a modified gum area 6 ".
Both at the initial situation 1 and 2 the situation after treatment records exist, which are shown separately in Figure 2a on a computer 10 and in Fig. 2b. The record 11 indicates the starting position again and the record 12 the situation after treatment, ie that situation that exists in order to ascending or dental care use. As can be seen in Figure 2, the two data sets are superimposed in the display. The illustration in FIG. 2, although only schematically shown as a sectional view on the screen, but the preparation is carried out as a rule in a spatial representation on the screen. In the modeling of a dental prosthesis is therefore in addition to the situation that reflects the record 12, and the initial situation (see record 11) optically easily detectable, so that it is possible to consider the starting point for modeling the denture care. The starting point may be displayed semi-transparent and / or may be displayed or hidden, so that the underlying (typically) 12 is visible "actual situation".
In Fig. 2b shows a simulation of an ideal supply 13 is further displayed. The teeth have here, for example, no gaps therebetween. Furthermore, the upper edge of the teeth is more uniform as compared to the actual situation. These are common examples of characteristics of an ideal supply.
The shape of a proposed dental prosthesis of software, in the section in Fig. 2b, for example, lie between the two lines of the data set 12 and the simulation. 13 Depending on the weighting of the ideal supply and the output state of the proposal more the ideal supply or the output status is the same.
3a shows an example of a possible dental prosthesis is shown. This case consists of a bridge with two bridge parts 15, 19, two connectors 16, 18 and 17. Such a pontic bridge constructions can be made of very hard materials such as ceramics, titanium, or the like. They can then be blinded.
However, the solution shown in Figure 3a is unsatisfactory in that the bridge parts 15, 19 and the pontic 17 well above the initial situation 1 (see record 11) to go out, so that it is impossible to recover with such a dental prosthesis the original appearance.
In Figure 3b, however, a solution is shown, in which a bridge of two bridge parts 21, 25, two connectors 22, 24 and a pontic is created 23rd The whole bridge (apart from the connectors 22, 24) is located inside the outer edge of the record 11, so that, therefore, the bridge can be designed with appropriate facings that it reproduces teeth, which are very similar to those of the initial situation. 1 Only the connector 22, 24 are located outside the mold, which is indicated by the data 11, but this is unavoidable, as are 3,4,5 respectively small gaps between the teeth. In abutting teeth, the connectors are preferably provided in the area where the teeth meet.
While in Figure 3 a bridge has been discussed as an example of a dental prosthesis, an artificial dentition is shown in Figures 4 to. 6 However, the described invention may be used for any kind of dental prosthesis such as crowns, bridges, dentures, inlays, onlays, overlays, cap, an artificial teeth, dental implants, abutments, copings, secondary or Tertiarkonstruktionen or the like.
In Figure 4a the initial situation 1 is shown with an indication as to the location of the sectional view shown in Figure 4b. Here the gums 6 with the molar tooth 4 is shown.
The state after the treatment is shown in Figure 5a and 5b. Here, all the teeth 3, 4, 5 have been extracted, so that the gums 6 slightly collapses and the reference numeral 6 'wears.
In Figure 6 is a data record for the gingival 6 'shown (solid line) together with a stippled shown record 30, which represents the initial situation (see figure 4). The data record 31 that reflects the shape of the gums 6 ', can be used to indicate the lower mold of a denture (Third teeth), whereas the record may be used 30 to model both the artificial gums and denture ,
In the modeling of a dental prosthesis, such as the bridge in Figure 3, can be modeled with the same time, the outer color of the desired dental prosthesis. This information can also be sent to a dental technician then draws up a veneer for the bridge.
Also, in a method for modeling or producing a denture (see Figures 4 to 6), it is advantageous if the color information of the initial situation (see figure 4) is detected with a corresponding record. In an automated production of such a denture can then reaches a corresponding color or are then applied (for example, a ping Rapidprototy- method or a milling method).
By capturing the color situation of the initial situation dentures or general dental restorations can be manufactured so that the initial situation are also very similar in color.
A specific example of the procedure for manufacturing a dental prosthesis will be explained in the following. The example relates to an example concretely the manufacture of a denture. but the steps can be carried out in accordance with all other dental supplies.
Of an existing denture (s. Fig. 4) of a patient is obtained, an impression with which a plaster model of the dentition is made. The model is optically scanned and stored the data (reference numeral 30) recovered. Then, the existing teeth are extracted and / or by grinding (s. Fig. 5). an impression is taken back by this situation and the corresponding plaster model is scanned (record 31). The data set 31 we used (the facing to the side of the jaw) of the denture set the shape of the bottom, which form the shape of the data set 31 corresponds to ensure optimal fit.
For the lateral sides and the tops software makes automatically generated suggestions (see, eg, record 30), which can therefore be transferred or even modified. The automatically generated proposal, the actual situation, the initial situation (s. Fig. 4a) and / or consider a simulated ideal situation possibly with different weights. In drawing of automatic proposal reference is made to predetermined shape data sets. Instead of the automatic proposal and the initial situation can be displayed and the desired dental prosthesis to be modeled on a computer. The initial situation shown here serves as a guide when modeling.
With the software, a digital model of the dental prosthesis is created, the remote data transmission to a CAM (Computer Aided Manufacturing) then, for example - will be sent to the machine that makes the dental care.
Priority Applications (2)
|Application Number||Priority Date||Filing Date||Title|
|DE200710002143 DE102007002143A1 (en)||2007-01-15||2007-01-15||A method for modeling or producing a dental prosthesis, computer readable medium and computer|
|PCT/EP2008/000123 WO2008086969A1 (en)||2007-01-15||2008-01-09||Method for modelling or producing a denture supply, machine-readable data carrier, and computer|
|Publication Number||Publication Date|
|EP2118790A1 true true EP2118790A1 (en)||2009-11-18|
Family Applications (1)
|Application Number||Title||Priority Date||Filing Date|
|EP20080701051 Pending EP2118790A1 (en)||2007-01-15||2008-01-09||Method for modelling or producing a denture supply, machine-readable data carrier, and computer|
Country Status (4)
|US (1)||US20100106276A1 (en)|
|EP (1)||EP2118790A1 (en)|
|DE (1)||DE102007002143A1 (en)|
|WO (1)||WO2008086969A1 (en)|
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|Publication number||Priority date||Publication date||Assignee||Title|
|DE102009043048B4 (en) *||2009-09-28||2012-03-22||Wajeeh Khan||Bit holder arrangement of individual tooth models and bite holder and simplified method for transmitting a virtual tooth position in a real teeth model|
|EP2624782A4 (en) *||2010-10-06||2014-04-02||3Shape As||Designing a double crown comprising an internal crown and an external crown|
|WO2012083960A1 (en) *||2010-12-22||2012-06-28||3Shape A/S||System and method for scanning objects being modified|
|EP2486892B1 (en)||2011-02-14||2015-09-02||Ivoclar Vivadent AG||Method for manufacturing a dental restoration part and CAD/CAM device|
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|US6648640B2 (en) *||1999-11-30||2003-11-18||Ora Metrix, Inc.||Interactive orthodontic care system based on intra-oral scanning of teeth|
|CA2342709A1 (en) *||2001-03-23||2002-09-23||Dentalmatic Technologies Inc.||Methods for dental restoration|
|US20030222366A1 (en) *||2001-12-21||2003-12-04||Ivan Stangel||Production of dental restorations and other custom objects by free-form fabrication methods and systems therefor|
|US7156661B2 (en) *||2002-08-22||2007-01-02||Align Technology, Inc.||Systems and methods for treatment analysis by teeth matching|
|US7474932B2 (en) *||2003-10-23||2009-01-06||Technest Holdings, Inc.||Dental computer-aided design (CAD) methods and systems|
|US20060275736A1 (en) *||2005-04-22||2006-12-07||Orthoclear Holdings, Inc.||Computer aided orthodontic treatment planning|
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|See references of WO2008086969A1 *|
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