WO2012126970A1 - Procédé de traitement d'un modèle dentaire au moyen d'un outil virtuel - Google Patents

Procédé de traitement d'un modèle dentaire au moyen d'un outil virtuel Download PDF

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Publication number
WO2012126970A1
WO2012126970A1 PCT/EP2012/055046 EP2012055046W WO2012126970A1 WO 2012126970 A1 WO2012126970 A1 WO 2012126970A1 EP 2012055046 W EP2012055046 W EP 2012055046W WO 2012126970 A1 WO2012126970 A1 WO 2012126970A1
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WO
WIPO (PCT)
Prior art keywords
tooth
model
tooth model
virtual
virtual tool
Prior art date
Application number
PCT/EP2012/055046
Other languages
German (de)
English (en)
Inventor
Ulf Willers
Original Assignee
Sirona Dental Systems 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 Sirona Dental Systems Gmbh filed Critical Sirona Dental Systems Gmbh
Publication of WO2012126970A1 publication Critical patent/WO2012126970A1/fr

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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
    • 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
    • A61C13/08—Artificial teeth; Making same
    • A61C13/097—Artificial teeth; Making same characterised by occlusal profiles, i.e. chewing contact surfaces
    • G—PHYSICS
    • G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
    • G16H—HEALTHCARE INFORMATICS, i.e. INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR THE HANDLING OR PROCESSING OF MEDICAL OR HEALTHCARE DATA
    • G16H20/00—ICT specially adapted for therapies or health-improving plans, e.g. for handling prescriptions, for steering therapy or for monitoring patient compliance
    • G16H20/40—ICT specially adapted for therapies or health-improving plans, e.g. for handling prescriptions, for steering therapy or for monitoring patient compliance relating to mechanical, radiation or invasive therapies, e.g. surgery, laser therapy, dialysis or acupuncture

Definitions

  • the invention relates to a method for processing a first virtual three-dimensional tooth model of a tooth generated during the planning of a dental prosthesis by means of a virtual tool.
  • the dental model is planned in the first step by means of a computer automated, taking into account the adjacent teeth, the opposing antagonists and other factors. It may happen that the proposed tooth model is rotated or arranged below or above an occlusal surface of the adjacent teeth. These errors of the proposed tooth model are corrected in the second step by means of a virtual tool. For correction in the second step, the proposed tooth model is usually cut off from the rest of the model of the tooth replacement on an equator line at the widest circumference of the tooth model. Then corrected using the virtual tool and then reconnected to a preparation margin using mathematical algorithms.
  • the virtual tooth model may be a model for partial crowns, onlays, inlays, or veneers.
  • a disadvantage of this method is that when cutting off the virtual tooth model from the rest of the model and when reconnecting to the preparation margin information, such as the arrangement and the dimensions of the contact points to Neighboring teeth and set material thickness of the first toothed model, lost. Therefore, after connecting the first tooth model to the rest of the model, the contact points to the neighboring teeth must be rescheduled and other boundary conditions, such as the material thickness, checked. This is associated with a higher cost.
  • DE 10 2004 938 136 A1 discloses a method for constructing the surface of a tooth replacement part consisting of three-dimensional data, wherein three-dimensional data of a tooth surface of a stored tooth are used at least as part of the surface of the tooth replacement part to be produced.
  • the tooth surface is first determined in its extent and then arranged on a stored tooth replacement part or in the region of a three-dimensional virtual preparation parts.
  • the position of the digital tooth surface in the tooth replacement part or on the preparation parts can be determined in at least one spatial direction and / or one direction of rotation.
  • a tooth surface of the contralateral tooth is mirror-inverted to form the surface of the restoration.
  • the selected tooth surface is mirrored using mirrors, showing a selection dialog.
  • the size of the selected tooth surface can be changed, so that an adaptation to the adjacent teeth is possible.
  • the location of the selected tooth surface can be changed to horizontal, vertical, skew and expansion. This transfer of the selected tooth surface is done using the usual CAD machining tools.
  • a disadvantage of this method is that the information obtained during the planning of the first tooth model must be lost when cutting off the residual model and must be recreated after reconnecting to the preparation margin.
  • the object of this invention is therefore to provide a method for processing a first virtual three-dimensional tooth model of a dental prosthesis part generated during the planning of a dental prosthesis by means of a virtual tool, which enables a time-saving and with little effort associated processing.
  • the invention relates to a method for processing a generated during the planning of a dental prosthesis first virtual three-dimensional tooth model of a dental prosthesis part by means of a virtual tool.
  • the first virtual tooth model is processed by means of the virtual tool, wherein during the processing by means of the virtual tool the first virtual tooth model is automatically adjusted by means of a computer so that certain boundary conditions defined during the planning of the tooth replacement remain satisfied.
  • the present method takes place only after an automated planning of a tooth replacement in order to correct the first proposed virtual three-dimensional tooth model of the tooth replacement part by means of the virtual tool.
  • the dental prosthesis to be planned may be a part of a tooth, such as a partial crown, an onlay, an inlay or a venier, or a whole tooth, such as a full crown, or several teeth of a dental arch that are connected to one another or arranged separately from one another.
  • the first tooth model may be a part of the tooth replacement or the entire tooth replacement.
  • the first dental model For post-processing of the first dental model, it can be visually separated from the rest of the model of the dental prosthesis or from a three-dimensional recording of the surrounding tooth structures, such as the neighboring teeth or a repair site, by visually fading the surrounding tooth structures of the receptacle and / or the residual model of the denture.
  • the user can effect different processing steps, such as an enlargement, a change of the position, a reduction and / or a change of the form.
  • the boundary conditions previously defined during planning such as the contact surfaces to the neighboring teeth and / or a specific material thickness of the first virtual tooth model, are taken into account.
  • the automatic, computer-assisted adaptation of the virtual tooth model can be carried out by means of a specific algorithm, wherein when changing a surface point of the virtual tooth model, the angular relationships and the length ratios to the surrounding surface points remain the same. In this case, the ratio or the quotient between a first distance and a second distance before the change and after the change remains the same, the first distance between the first surface point to be changed and a second adjacent surface point and the second distance between the first surface point to be changed and another adjacent third surface point.
  • the ratio between a first angle and a second angle before changing the first surface point and after changing the first surface point remains the same, the first angle between the connection line from the second surface point to the third surface point and the connection line from the second surface point to the first surface point to be changed and the second angle between the connecting line from the second surface point to the third surface point and the connecting line from the third surface point to the first surface point to be changed.
  • the automatic adjustment can be done iteratively in small steps throughout the duration of the application of the virtual tool. This ensures a smooth transition to the adjacent surface points, while maintaining aesthetically significant structures, such as fissures and depressions, in their shape.
  • An advantage of this method is that the post-processing of the proposed first tooth model, the specified boundary conditions remain met and then the necessary steps, such as planning the contact surfaces to the adjacent teeth, checking the material thickness, the connection to a preparation margin a smooth transition between the first tooth model and a residual tooth, omitted.
  • a further advantage of this method is that the computer-aided adherence to the specified boundary conditions is less error-prone compared to a manual connection of a cut tooth model to the preparation margin and the subsequent re-planning of the contact points.
  • the adaptation of the first tooth model can be carried out so that the specified boundary conditions remain met within certain specified tolerance ranges.
  • the specified boundary conditions do not have to remain exactly met, but can change during machining by means of the virtual tool within tolerance limits of the tolerance ranges.
  • tolerance ranges are determined based on mechanical, geometric and aesthetic requirements.
  • the material thickness must not fall below a certain thickness so that the dental prosthesis to be produced remains mechanically stable under the mechanical loads acting on it.
  • the dimensions of a penetration between two adjacent tooth models must also have certain mechanical stability and must be designed large enough, for example, to avoid voids between the teeth of the tooth replacement to be produced.
  • the boundary conditions to be met can be the following boundary conditions, namely a boundary condition for a specific dimension of a contact surface to an approximately adjacent second virtual tooth model of the tooth replacement or to a neighboring tooth from a three-dimensional optical recording and / or for a specific dimension of a penetration between the first tooth model and the adjacent second tooth model and / or for a specific arrangement of a contact surface to an occlusally adjacent third three-dimensional virtual tooth model of the tooth replacement or to an antagonist from the three-dimensional recording and / or for a certain material thickness of the first virtual tooth model between a preparation lumen and egg- ner outer surface and / or for the form of a connection to a preparation margin and / or for the shape of certain aesthetic structures on the outer surface of the first tooth model and / or for a specific dimensioning edge reinforcement of the first tooth model and / or the one form of a smooth transition between the first virtual tooth model and a preparation model, which represents a preparation and a residual tooth and / or for an over-contouring of the tooth
  • the specified boundary conditions remain satisfied during processing by means of the virtual tool.
  • Compliance with the dimensions of the contact surface to the proximal neighboring tooth model of the planned dental prosthesis or to the adjacent tooth from a three-dimensional optical recording ensures that no interdental spaces arise.
  • Compliance with the dimension of the penetration between the first tooth model and the second adjacent tooth model of the dental prosthesis ensures that the dental prosthesis is mechanically loadable at the site of penetration and no cavities between the teeth of the prosthesis to be produced arise.
  • Compliance with the material thickness of the first virtual tooth model between the preparation lumen, which may be formed as a counterpart to the preparation, and the outer surface ensures the predetermined mechanical stability of the prosthesis to be produced.
  • the connection of the first tooth model to the preparation margin remains unchanged during the processing of the first tooth model by means of the virtual tool, thereby ensuring a secure fit of the dental prosthesis to be prepared to the preparation.
  • the aesthetic structures as determined by the visual impression Natural teeth resembling grooves and depressions, remain unchanged during the processing of the first tooth model, so that the aesthetics of the first tooth model is not deteriorated. Compliance with the dimension of the edge reinforcement ensures a mechanical stability of the denture to be produced in the edge region.
  • the preparation model may comprise image data of a three-dimensional recording of the preparations and / or the remaining tooth.
  • the contour of the first tooth model projects beyond the contour of the actual tooth replacement by overcontouring.
  • the material to be removed is taken into account during the polishing of the dental prosthesis after grinding by means of a CAD / CAM system.
  • the over-contouring may be between -200 pm and +200 pm with respect to the contour of the actual denture, preferably between 25 pm and 75 pm.
  • the overcontouring to be applied can be specified by the user as a boundary condition.
  • the first tooth model is rotated about a rotation axis, which is arranged, for example, in the direction of the tooth axis. Structures on the occlusal surface, such as fissures and cusps, are also rotated. Every little one
  • Step of rotation of about 0.1 0 is an automatic adjustment.
  • Automatic adjustment will Checks whether the original contact surfaces of the original tooth model before rotation to the third tooth model or to the antagonist have been released by the rotation or vice versa have penetrated into the model of the Gegengebisses and thereby penetrations were formed. Furthermore, it is checked whether penetrations have been formed by the rotation also at other places of the occlusal surface. Subsequently, the contact surfaces are corrected by pulling the contact surfaces in the direction of the counterbite until they come into contact with the occlusal surface of the third tooth model or of the antagonist.
  • a plausibility check may be performed in which the distance between the original co-rotating contact surface and the occlusal surface of the opposing dentition is compared to a threshold and the correction is made only if the threshold has not yet been exceeded.
  • This threshold may be, for example, 100 pm.
  • the contact surface may comprise any surface, several surfaces or even several or individual contact points.
  • the automatic adaptation described is iteratively performed in small increments throughout the duration of the application of the virtual tool.
  • the first virtual tooth model represented by means of a display device can visually for easier processing by means of the virtual tool are separated, wherein the virtual three-dimensional preparation model of the residual tooth and / or the second adjacent tooth model and / or the third occlusally opposed tooth model are hidden visually.
  • the display device may be a conventional monitor connected to a computer with denture planning software.
  • the structures which are arranged around the first tooth model to be processed are only hidden visually, whereby the linking data of the first tooth model via the links to the surrounding structures, such as contact surfaces and the other abovementioned boundary conditions, are preserved. By fading in the surrounding structures, it is easier for the user to process the first tooth model by using the virtual tool.
  • the residual model of the denture may include the second tooth model of the adjacent tooth and / or the third tooth model of the opposing tooth.
  • the three-dimensional recording of the actual dental situation in the mouth of the patient may include the preparation model of the preparation, the remaining tooth, the neighboring teeth and / or the antagonists.
  • the virtual tool can rotate the first tooth model about a first rotation axis and / or an enlargement or reduction of the first tooth model and / or a translation of the position of the first tooth model with the same orientation and / or a change in the shape of the outer surface of the first tooth model effect first tooth model.
  • the virtual tool can be selected by means of a keyboard or a mouse and by means of the display device the application of the virtual tool to the first tooth model can be visually tracked by the user.
  • the selection and application of the virtual tool can also be done by means of a touch-sensitive screen (touch screen, touch pad).
  • touch screen touch screen, touch pad
  • the contact points to the neighboring teeth would be rotated in conventional methods, so that a re-planning of the contact points would be required.
  • the contact points to the neighboring teeth remain unchanged in their dimensions and in their position.
  • the first tooth model is deformed during the application of the virtual tool so that the above boundary conditions are retained.
  • the user can follow the deformation of the first toothed model while observing the abovementioned boundary conditions on the display device.
  • the user can thereby better estimate the extent to which he applies the virtual tool to the first tooth model, for example, in which angle of rotation the first tooth model is rotated.
  • the user can, for example, prevent the first tooth model from being excessively compressed or excessively stretched during automatic adjustment, thereby no longer satisfying the aesthetic requirements by virtue of the visual tracking.
  • the automatic adaptation of the first tooth model during the application of the virtual tool can be displayed for visual inspection by a user by means of the display device.
  • the first tooth model can be visually separated at the preparation margin.
  • the entire first tooth model can be visually highlighted for processing, whereby the remaining structures are visually hidden. This gives the user a better overview of the first tooth model to be machined. To calculate and take into account the conditions to be met, the tooth model remains invisible to the user for the preparation.
  • FIG. 1 shows a sketch to illustrate the present method with a display device.
  • Fig. 5 is a sketch, as in Fig. 4, after the application of the virtual tool without application of the present method
  • Fig. 6 is a sketch, as in Fig. 4, after the application of the virtual tool with the application of the present method
  • FIG. 7 shows a sketch of the first tooth model with the dimensions of the first contact surface with the second tooth model that is approximately adjacent;
  • FIG. 8 is a sketch of the first toothed model with a
  • third contact surface comprising a plurality of circular contact points
  • FIG. 11 shows a sketch of the first tooth model from FIG. 10 and FIG. 6 after the rotation
  • FIG. 12 is a sketch of the first toothed model from FIG.
  • Fig. 13 is a sketch to illustrate the adaptation of the penetrations
  • Fig. 14 is a diagram for illustrating the correction of the penetration
  • FIG. 15 shows a sketch to clarify the plausibility check
  • 16 shows a sketch to illustrate the plausibility check.
  • FIG. 1 shows a sketch to illustrate the present method.
  • the tooth situation including for example a lower jaw 1 and an upper jaw 2
  • an optical three-dimensional receiving device 3 which in the present case is a handpiece based on a triangulation measurement method.
  • the generated image data of the recording device tion 3 are transmitted to a computer 4, which accounts for the individual images to a three-dimensional optical recording.
  • the three-dimensional optical image 5 from the lower jaw 1 and the upper jaw 2 is represented by means of a display device 6, such as a monitor.
  • the user can arbitrarily change the viewing direction to the three-dimensional optical recording by means of a cursor 7.
  • first preparation 8 and a second preparation 9 which are shown by dashed lines, taking into account the dimensions of a residual tooth 10, taking into account the adjacent teeth 11 and 12 and taking into account the opposing teeth 13 and 14, also called antagonists, becomes a first virtual three-dimensional dental model 15 of a dental prosthesis, in the present case a single tooth, generated using automated algorithms.
  • the planned dental prosthesis 16 comprises in the present case the first dental model 15, an approximately adjacent second virtual dental model 17 and an occlusally adjacent third three-dimensional virtual dental model 18, which are shown hatched.
  • the third tooth model 18 is in the present case a part of the counter tooth 14, which complements the remaining tooth 10.
  • planning errors may occur, for example, that the proposed in planning first tooth model 15 is twisted or an occlusal surface 19 is located lower or higher than the adjacent occlusal surfaces 20 and 21.
  • the user can operate the computer 4 by means of the connected keyboard 22 and the mouse 23 to perform the present method of post-processing the first tooth model 15 by means of a virtual tool.
  • the virtual tool may be a first virtual tool 24 for rotating the first tooth model 15 about its own tooth axis 25, a second virtual tool 26 for rotating the first tooth model 15 about a rotation axis perpendicular to the tooth axis 25, a third virtual tool 27 for enlarging the first tooth model 15, a fourth virtual tool 28 for reducing the first tooth model 15, a fifth virtual tool 29 for changing the shape of an outer surface 30 of the first tooth model 15, for example, for the production of aesthetic structures or a sixth virtual tool 31 for translating the position in the same orientation of the first tooth model 15 be.
  • the appropriate virtual tool can be selected by the user by means of the cursor 7 and is applied to the first tooth model 15.
  • the first tooth model 15 is adapted so that certain boundary conditions defined in the planning of the dental prosthesis 16 remain satisfied.
  • the boundary conditions to be met may be a specific dimension of a first contact surface 32 to the approximately adjacent second tooth model 17, a penetration 33 between the first tooth model 15 and the second tooth model 17 and / or the dimension of a second contact surface 34 to the proximally disposed adjacent tooth 12 and / or the dimension of a third contact surface 35 to the occlusively adjacent counter tooth 13 and / or a certain material thickness 36 of the first tooth model 15 between a preparation lumen 37, which is designed as a counterpart to the preparation 9 and the outer surface 30 and / or the form a connection a preparation margin of the preparation 9 and / or the shape of the aesthetic structures, not shown, on the outer surface.
  • the first tooth model 15 is so deformed in the application of one of the tools 24, 26, 27, 28, 29 or 31, ie compressed or stretched, that the above in boundary conditions stay fulfilled.
  • the aforementioned boundary conditions can also be
  • FIG. 2 shows the application of the virtual tool to another embodiment of the first tooth model 15, which supplements a residual tooth 40, such as the residual tooth 10 from FIG. 1.
  • the dashed line shows the first tooth model 15 after the application of the third virtual tool 27 of FIG. 1 for magnification, wherein the present inventive method is not performed, so that at the corners 41 and 42 no smooth transition to the residual tooth 40 is maintained.
  • FIG. 3 shows a sketch of the first tooth model 15, as in FIG. 2, with the difference that the dashed line represents the first tooth model 15 'after the application of the third virtual tool 27 using the present method, wherein the smooth transition to the Ü-transition points 41 and 42 to the remaining tooth 40 is maintained. As a result, a subsequent correction is not required lent.
  • FIG. 4 shows a sketch of the first tooth model 15, of the neighboring tooth 12 and of the second approximal adjacent tooth model 17 in plan view.
  • the first contact surface 32 with the penetration 33 and the second contact surface 34 from FIG. 1 fulfill the boundary conditions.
  • On the occlusal surface 19 of the first tooth model 15 are arranged aesthetic structures 50 which have certain grooves and depressions, which are modeled on the visual impression of a natural tooth.
  • FIG. 5 shows the first tooth model 15 y from FIG. 4 after the application of the first virtual tool 24 from FIG. 1 for rotation about its own tooth axis 25 without the use of the present method.
  • the first contact surface 33 and the second contact surface 34 have been dissolved, so that a first tooth gap 61 and a second tooth gap 62 have arisen. Therefore, in the present case, a subsequent correction of the first toothed model 15 'is required.
  • the third contact surface 35 comprising a plurality of circular regions or contact points has been rotated, so that these contact points no longer fit the opposing dentition and therefore a subsequent manual correction of the first dental model 15 'is required.
  • Fig. 6 unlike Fig. 5, a situation using the present method is shown.
  • the first virtual tool 24 from FIG. 1 is used for rotating the first toothed model 15 'in the direction 60 about the tooth axis 25, the first contact surface 32 with the penetration 33 and the second contact surface 34 are retained.
  • the third contact surface 35 to the counter-tooth 13 and the aesthetic structures 50 were rotated in the application of the virtual tool.
  • the third contact surface 35 no longer fits the counter tooth 13.
  • contact points 63, 64 which are shown with a cross, have been released.
  • the automatic adaptation of the third contact surface 35 comprising the contact points 63, 64 is explained in more detail in FIGS. 10, 11 and 12.
  • FIG. 7 shows a sketch of the first tooth model 15 with the dimensions of the first contact surface 32 to the second ap proximal adjacent tooth model 17.
  • the contact surface can also represent a contact to a neighboring tooth from the three-dimensional recording 5.
  • the first contact surface 32 is retained in its dimensions.
  • the dimensions of the first contact surface 32 can also move between a first tolerance limit 70 and a second tolerance limit 71, which are shown in dashed lines, within the specified tolerance range.
  • the material thickness 36 between the preparation lumen 37 and the outer surface 72 also remains within a defined tolerance range when using the virtual tool, which is predetermined by mechanical specifications of the tooth replacement part to be produced.
  • the shape of a connection 73 to the preparation edge 74 of the preparation 9 is maintained within a tolerance range which is predetermined by the required accuracy of fit of the dental prosthesis part to be produced.
  • a smooth transition 75 between the first tooth model and a preparation model 76 of the preparation 9 or of the remaining tooth 40 is maintained in the application of the virtual tool within a specified tolerance range, which is predetermined by aesthetic requirements for the tooth replacement part to be produced.
  • FIG. 8 shows a sketch of the tooth replacement part 15, as shown in FIG. 7, with the difference that an over-contouring 80 with respect to the surface 81 of the dental prosthesis to be produced is shown when the virtual tool is used.
  • the distance 82 of the over-contouring 80 of the dental prosthesis to be produced corresponds to a distance carrying the material in a subsequent polishing operation after grinding the denture out of a blank using a conventional CAD / CAM device.
  • the consideration of the over-contouring has the advantage that the smooth transition 75 is maintained after the polishing process.
  • the distance 82 of the over-contouring 80 may be up to 200 ⁇ m, preferably between 25 ⁇ m and 75 ⁇ m, depending on the blank material used for producing the dental prosthesis and on the type of polishing process.
  • FIG. 9 shows a sketch for clarifying the algorithm used in the automatic adaptation of the virtual tooth model.
  • the ratio or quotient between a first distance 93 and a second distance 94 before the change and between the first distance 95 and the second distance 96 after the change remains the same, wherein the first distance 93 between the first surface point to be changed 91 and the second surface point 91 and the second distance 94 between the first surface point 90 and the third surface point 92.
  • the first surface point is shifted from a first layer 90 to a second layer 90 '.
  • the ratio between a first angle 97 and a second angle 98 remains the same before the first surface point 90 changes and after the first surface point changes, with the first angle 97 before the change and the first angle 100 after the change between the connection line 99 from the second surface point 91 to the third surface point 92 and the connecting line 93 or 95 from the second surface point 91 to the first surface point 90 or 90 'to be changed and the second angle 98 before the change and the second angle 101 after the change between the connection line 99 and the connecting line 94 or 96 from the third O surface point 92 to the first surface point to be changed 90 and 90 y .
  • FIG. 10 shows a sketch of the first toothed model 15 with the third contact surface 35 comprising a plurality of circular contact points from FIG. 4 before rotation.
  • FIG. 11 is a sketch of the first tooth model 15 from FIG. 10 and FIG. 6 after rotation by means of the virtual tool.
  • an iterative examination and adaptation of the contact surface 35 takes place.
  • the contact points 63 and 64 of the original tooth model, which are crossed through, have become detached from the occlusal surface of the counter tooth 13 by the rotation.
  • no correction is made for these contact points, since it has been found in a plausibility check that the distance between these original contact points 63 and 64 and the occlusal surface of the counter tooth 13 and the end position after the rotation is too large and a defined threshold value, such as 100 ⁇ m, for example. exceeds.
  • FIG. 12 shows a sketch of the first toothed model 15 from FIG. 11, after which a correction has been carried out. In the correction, the dissolved contact point 110 is drawn in the direction of the antagonist 13 until it comes into contact with the occlusal surface of the antagonist 13.
  • the surface areas of the penetrations 116, 117, 118, 119, 120 and 121 of FIG. 11 are drawn in a direction away from the antagonist 13 until they come into contact with the occlusal surface of the antagonist 13. Thereby new contact points 130, 131, 132, 133, 134, 135 and 136 are formed. For the original contact points 63, 64 no correction takes place.
  • FIG. 13 a sketch for clarifying the adaptation of the penetrations 121 from FIG. 11 is shown by way of example.
  • the first tooth model 15 has penetrated into the occlusal surface of the antagonist 13, which has a fissure 140, by rotation, so that the penetration 121 has been formed thereby.
  • a correction the area of the penetration 121 is pulled in a direction 141 away from the counter-tooth 13 until the contact is only at the contact points 135 and 136.
  • FIG. 14 shows a sketch to illustrate the correction of the penetration 118, wherein the contact point 132 is formed. The difference from FIG. 13 is that the occlusal surface of the antagonist 13 has no fissure.
  • FIG. 15 shows a sketch for clarifying the plausibility check.
  • a correction is made, as represented by the dashed line, because the distance 150 between the contact point 110 and the antagonist 13 does not exceed a certain threshold, for example, of 100 pm. tet.
  • a certain threshold for example, of 100 pm. tet.
  • the distance 150 of the original contact point 63 is greater than the threshold, so that no correction takes place.

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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)
  • Dental Prosthetics (AREA)

Abstract

L'invention concerne un procédé de traitement au moyen d'un outil virtuel (31) d'un premier modèle dentaire virtuel tridimensionnel (15) d'une partie de prothèse dentaire, généré lors de la planification d'une prothèse dentaire (16). Le premier modèle dentaire virtuel (15) est traité au moyen de l'outil virtuel (24, 26, 27, 28, 29, 31) et, pendant le traitement au moyen de l'outil virtuel (24, 26, 27, 28, 29, 31), le premier modèle dentaire virtuel (15) est automatiquement adapté à l'aide d'un ordinateur (4) de manière à ce que des conditions additionnelles précises fixées lors de la planification de la prothèse dentaire (16) soient toujours remplies.
PCT/EP2012/055046 2011-03-22 2012-03-22 Procédé de traitement d'un modèle dentaire au moyen d'un outil virtuel WO2012126970A1 (fr)

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DE102011005899.0 2011-03-22
DE102011005899A DE102011005899A1 (de) 2011-03-22 2011-03-22 Verfahren zur Bearbeitung eines Zahnmodells mittels eines virtuellen Werkzeugs

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WO2012126970A1 true WO2012126970A1 (fr) 2012-09-27

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013203588A1 (de) * 2013-03-01 2014-09-04 Sirona Dental Systems Gmbh Verfahren zur Konstruktion von Zahnoberflächen eines Zahnersatzteils sowie zur Herstellung dentaler Restaurationen
DE102014201993A1 (de) * 2014-02-04 2015-08-06 Sirona Dental Systems Gmbh Verfahren zur computergestützten Bearbeitung eines digitalen 3D-Modells
EP3801361B1 (fr) 2018-06-01 2022-10-05 DENTSPLY SIRONA Inc. Procédés de conception numérique de dents artificielles
ES2886876T3 (es) * 2019-03-08 2021-12-21 Exocad Gmbh Modelado implementado por ordenador de una pieza de prótesis dental individualizada para el paciente

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