Method for producing a computer model for an abutment and method for producing an abutment

Abstract

The invention relates to a method for producing a three-dimensional computer model (1) of a patient-specific abutment (2) for a dental implant (12) with the aid of a computer (3), the abutment (2) having at least one base (4), a connecting structure (5), a coronal-looking platform surface (6) and a spiral channel (7), the method comprising the following steps: - providing a three-dimensional representation (10) of the patient's jawbone readable by the computer (3), - selecting the limitation of the preparation boundary according to the patient's individual gingival course, - defining the three-dimensional geometry of the abutment (2) above the preparation boundary by an operator of the computer (3) or by an algorithm, - defining the gingival contour (E) of the abutment (2) by an operator of the computer (3) or by an algorithm, - providing the three-dimensional computer model (1) by the computer (3), wherein a disk-shaped configuration of the platform surface (6) is provided below the preparation boundary for the three-dimensional geometry of the platform.

Description

Technical Field

[0001] The invention relates to a method of the described features and a method for producing a base station as well as a computer program product, a computer-readable storage medium, a computer-readable data carrier and a data carrier signal transmitting such a computer program product and a computer configured for implementing one of the described methods and / or for executing such a computer program product. Background Art

[0002] An abutment (sometimes also referred to as "Aufsatz" in German) is understood in dentistry as a connecting element between a pin-shaped dental implant and a prosthetic component (e.g. a single tooth component, a bridge component, a prosthesis, etc.). The connection to the prosthetic component can be realized directly or via an intermediate structure.

[0003] An abutment is known from EP 2 825 124 B1. The abutment shown in said document comprises a platform of disk-like configuration with an approximately coronal platform surface, which promotes cell growth and allows an intermediate structure or a prosthesis supply to be supported on the approximately coronal platform surface. The possibility of subsequent machining of the abutment allows the abutment to be individualized for a specific patient.

[0004] In dental implant supplies, the gingival contour (or emergence contour, Emergenzprofil) is understood to be the three-dimensional course of the gingiva in the region of the coronal extension starting from the dental implant to the gingival boundary where the abutment is to be placed.

[0005] In addition to prefabricated standard abutments, which must be manually reworked in a complex manner in the dental laboratory in order to adapt them to the specific given conditions at the donor site in the patient's jaw, it is known to directly produce patient-specific abutments. This is achieved by means of a computer-readable three-dimensional computer model of the patient-specific abutment to be produced. The three-dimensional computer model is produced based on a digitized simulated jaw impression of the patient's jaw or is provided directly in digital form (for example using an intraoral scanner or a laboratory scanner).

[0006] The individual gingival course of the patient is defined by an operator (eg dental technician or dentist) or by an algorithm where the abutment is to be placed.

[0007] Furthermore, the three-dimensional geometry of the abutment can be defined by the operator or by an algorithm above the preparation boundary predetermined by the individual gingival course. The definition of the three-dimensional geometry of the abutment can include:

[0008] - defines the position of a threaded channel extending in the abutment for fixing the abutment to the pin-shaped dental implant. Typically, the position is defined relative to the orientation of the pin-shaped dental implant.

[0009] - Defines the width of the approximately coronal platform surface of the abutment.

[0010] ——Define the height of the base.

[0011] - The width of the central protrusion with the spiral channel defining the abutment.

[0012] Furthermore, the gingival contour of the abutment can be defined by the operator of the computer or by an algorithm.

[0013] The transgingival contour (i.e. the outer geometry of the abutment below the preparation boundary up to the pin-shaped dental implant) has been previously predetermined in a standard shape, and the area between the transgingival contour and the spiral channel is defined as a filled volume, so that the computer operator has no room for manipulation here. As a result, in practice, a preparation boundary that extends too far is often selected in order to enlarge that area that can be selected or defined by the operator or the algorithm. This leads to the problem that the so-called adhesive seam between the abutment and the prosthesis supply body moves towards the dental implant and thus towards the patient's jawbone, which has destructive consequences for the gums and jawbone. Summary of the invention

[0014] The object of the present invention is to provide a method for producing a three-dimensional computer model of a patient-specific, patient-individual abutment for a dental implant by means of a computer and a method for producing such an abutment for a dental implant, wherein the computer model or the abutment produced based on the computer model is more compatible with the gums and jawbone of the patient.

[0015] The present invention should also provide a computer program product comprising instructions for executing the method, a computer-readable storage medium and a computer-readable data carrier comprising such instructions and a data carrier signal for transmitting such a computer program product, a computer for implementing one of the methods according to the invention and / or for implementing the computer program product according to the invention.

[0016] The steps of the method according to the invention are carried out outside the patient's body, since the invention is based on an already existing three-dimensional representation of the patient's jaw, at least in that region of the jaw where the abutment is to be placed.

[0017] According to a first variant of the invention, a disk-shaped configuration of an approximately coronal platform surface is provided below the three-dimensional geometric preparation boundary for the platform, as is known per se from EP 2 825 124 B1. The disk-shaped configuration has an adhesive seam between the abutment and the prosthesis supply body, which is advantageously arranged away from the dental implant. Since it is further provided that the material thickness of the platform of the abutment below the preparation boundary is selected by the operator of the computer starting from a defined transgingival contour, i.e., the material thickness below the preparation boundary of the abutment, the operator of the computer is eliminated from the motivation to select a preparation boundary that extends too deep in order to enlarge its design margin, since the invention allows the operator to construct the three-dimensional geometry of the abutment below the preparation boundary. In order to avoid the following unfavorable configuration, which in the case of an abutment manufactured according to a three-dimensional computer model provided by the computer can lead to a failure of the abutment, the invention provides that the three-dimensional geometry of the abutment below the preparation boundary can be selected by the operator only within a predetermined range stored in an electronic memory.

[0018] The disk-shaped configuration of the approximately coronal platform surface is sufficient in itself. Preferably, however, an underside of the platform (the surface of the platform that is spaced apart from the approximately coronal platform surface by the material thickness) that is arched in the coronal direction is also provided.

[0019] The invention provides that the three-dimensional geometry of the abutment below the preparation boundary can be selected by the operator at least to the extent that the operator can select the material thickness of the platform of the abutment (that is, the normal distance between the approximately coronal platform surface and the platform surface facing away from it) starting from a defined gingival penetration contour.

[0020] In a preferred embodiment, the invention provides that the three-dimensional geometry of the abutment below the boundary of the preparation can be further selected by the operator to the extent that the operator selects the

[0021] - the material thickness of the wall of the spiral channel (that is to say the normal distance between the inner wall defining the spiral channel and the wall of the region of the abutment having the coronal extension of the spiral channel facing away from the inner wall), and / or

[0022] - the material thickness of the base of the abutment (that is to say the normal distance between the outer side of the abutment facing the connection structure and the approximately coronal platform surface), and / or

[0023] For the transition between the approximately crown-shaped platform surface and the base of the abutment and / or for the transition between the base of the abutment and the wall of the spiral channel, a transition radius is selected within a predefined range stored in the electronic memory.

[0024] It should be noted that a constant material thickness is preferred for the material thickness of the platform of the abutment and / or for the material thickness of the wall of the threaded channel and / or for the material thickness of the base of the abutment. In principle, however, a variation of one or more of these material thicknesses is also possible (variable material thickness). The variation can be defined by predefining one or more support positions.

[0025] Preferably, provision is made for a corresponding region for a possible selection of material thickness or for a transition radius to be selected depending on the material of the abutment to be used (eg ceramic, titanium, plastic or hybrid material) and / or depending on a defined three-dimensional geometry of the abutment above the preparation boundary.

[0026] The predetermined ranges stored in the electronic memory (which the computer naturally has to access during the implementation of the method, at least during the corresponding steps) can be determined based on empirical values ​​and / or based on simulations and / or measurement sequences. For example, it can be provided that the material thickness

[0027] - The base of the abutment can be selected in the range from about 0.05 mm to about 4 mm,

[0028] - The platform can be selected in the range from about 0.05 mm to about 2 mm,

[0029] - The wall of the spiral channel can be selected in the range from about 0.05 mm to about 3 mm.

[0030] Preferably, it is provided that the method and a corresponding computer program (which, when executed by a computer, causes the computer to carry out the method) directly create a three-dimensional computer model for an abutment having an approximately coronal platform surface with a disc-shaped structure, starting from a provided computer-readable three-dimensional representation of the patient's jaw.

[0031] Alternatively, in a second variant of the invention, provision can be made that a three-dimensional starting computer model of the patient-specific abutment is first constructed using conventional methods and a corresponding computer program, the three-dimensional starting computer model having such a shape that the region extending radially between the spiral channel of the abutment and the gingival contour of the abutment is shown as filled with material. The computer then performs a transformation according to the method according to the invention or using a corresponding computer program according to the invention in order to obtain a three-dimensional computer model 1 from the three-dimensional starting computer model, in which a disk-shaped configuration of an approximately coronal platform surface is provided below the preparation boundary for the three-dimensional geometry of the platform, and the three-dimensional computer model has a material thickness of the platform of the abutment selected by the operator of the computer based on the defined gingival contour. The same additional optional features as discussed in connection with the first variant of the invention can be provided. In order to produce the abutment according to the invention for a dental implant using the material-reduced three-dimensional computer model of the patient-specific abutment produced using the method according to at least one of the above-described embodiments, an additive manufacturing method (e.g. laser sintering) is preferably provided, in which a powder (e.g. composed of ceramic, titanium, plastic or hybrid material) is solidified layer by layer by the action of energy.

[0032] Compared to conventional, chip-cutting or cutting methods for producing abutments, additive manufacturing methods are characterized by a shortened method duration. In addition, chip-cutting or cutting methods often require complex re-clamping. When using additive manufacturing methods, chip-cutting or cutting post-processing may also be necessary.

[0033] In all embodiments, the threaded channel may extend parallel to a central imaginary axis of the connection structure of the abutment or at an angle thereto. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Embodiments of the present invention are discussed with the aid of the accompanying drawings. In the drawings:

[0035] Figure 1a , 1b A schematic diagram showing two variants of an apparatus for carrying out the method according to the invention,

[0036] Figure 2 Shown in use Figure 1a or a schematic diagram of a method for manufacturing an abutment in the case of a result of method 1b,

[0037] Figures 3a to 3d shows different views and a cross-sectional view of an embodiment of an abutment to be manufactured by the invention,

[0038] Figure 4 As shown in Figure 3d A section view with dimensioned material thickness in

[0039] Figures 5a to 5d Different views and a cross-sectional view of an embodiment of a three-dimensional starting computer model of a patient-individual abutment, which is transformed during the method according to the invention,

[0040] Figure 6 A section through an embodiment of an abutment to be produced according to the invention is shown, wherein it can be seen how in a second variant of the invention a transformation is carried out starting from a three-dimensional starting computer model,

[0041] Figures 7a to 7d The diagram shows a computer-readable three-dimensional representation of a patient's jaw with a computer model of an abutment or without an abutment, a gingival cover and an abutment with a prosthetic supply in the form of a crown produced according to the method according to the invention. DETAILED DESCRIPTION

[0042] Figure 1a A device for running a method for producing a three-dimensional computer model 1 of a patient-specific, patient-specific abutment 2 for a dental implant 12 by means of a computer 3 is schematically shown, wherein the abutment 2 (see Figures 3a to 3d )have:

[0043] - Base 4,

[0044] - A connecting structure 5 for connecting the abutment 2 to the pin-shaped dental implant 12 (see Figure 7b ),

[0045] - a roughly coronal platform surface 6 of the platform of the abutment 2 for supporting the prosthetic donor, and

[0046] - A spiral channel 7 for fixing the abutment 2 to the pin-shaped dental implant 12.

[0047] The central imaginary axis Z of the connection structure 5 of the base 2 can be seen.

[0048] A three-dimensional representation 10 of the patient's jaw, at least in the region of the jaw where the abutment 2 is to be placed, is provided, which can be read by a computer 3. The three-dimensional representation can be provided in a known manner based on a digitized simulated jaw impression of the patient's jaw or directly in digital form (for example using an intraoral scanner and / or a laboratory scanner).

[0049] In a known manner, the definition of the preparation boundaries is selected by the operator of the computer 3 or by an algorithm at the location where the abutment 2 is to be placed, depending on the gingival course for the patient.

[0050] The three-dimensional geometry of the abutment 2 above the preparation boundary is defined by the operator of the computer 3 or by an algorithm. The definition of the three-dimensional geometry of the abutment 2 may include:

[0051] - defines the position of the threaded channel 7 extending in the abutment 2 for fixing the abutment 2 to the pin-shaped dental implant 12. Typically, the position is defined relative to the orientation of the pin-shaped dental implant 12.

[0052] - Defines the width of the approximately coronal platform surface 6 of the abutment 2.

[0053] ——Define the height of base 2.

[0054] - Defining the width of the central protrusion of the base 2 with the spiral channel 7.

[0055] The gingival contour E of the abutment 2 is defined by the operator of the computer 3 or by an algorithm.

[0056] According to the invention, a disk-shaped configuration of the approximately coronal platform surface 6 is provided below the preparation boundary for the three-dimensional geometry of the platform.

[0057] The operator of the computer 3 selects, starting from a defined gingival penetration contour E, a predefined range stored in the electronic memory 8 (see Figure 4 and Figure 6 ):

[0058] - Material thickness d1 of the platform of base 2,

[0059] - the material thickness d2 of the base 4 of the base 2, and / or

[0060] - the material thickness d3 of the wall of the spiral channel 7, and / or

[0061] - for the transition radius R1 of the transition between the approximately crown-shaped platform surface 6 and the base 4 of the abutment 2,

[0062] - Transition radius R2 for the transition between the base 4 of the base 2 and the wall of the spiral channel 7 .

[0063] The three-dimensional computer model 1 is provided by a computer 3 , for example, for producing a patient-specific abutment 2 for a dental implant 12 , preferably by an additive manufacturing method, using the three-dimensional computer model 1 produced according to the method just described.

[0064] Figure 1bThe embodiment of the invention differs from the embodiments discussed so far only in that, according to the second variant of the invention, firstly a three-dimensional starting computer model 9 of the patient's individual abutment 2 is constructed based on the provided three-dimensional representation of the jawbone, the gingival contour E and the definition of the three-dimensional geometry of the abutment 2 above the preparation boundary, wherein the three-dimensional starting computer model 9 has such a shape that the area extending radially between the spiral channel 10 of the abutment 2 and the gingival contour E of the abutment 2 is shown as filled with material (see Figures 5a to 5d ). Starting from the three-dimensional starting computer model 9, which itself represents a functionally suitable abutment, the computer 3 carries out a transformation by means of an algorithm (which, for example, calculates a certain necessary material thickness as a function of the angle of the spiral channel as a function of the calculated load peaks) in order to obtain from the three-dimensional starting computer model 9 a three-dimensional computer model 1 in which a disk-shaped configuration of an approximately coronal platform surface 6 is provided below the three-dimensional geometric preparation boundary for the platform and which has a material thickness d1 of the platform of the abutment 2 selected by the operator of the computer 3 as a function of the defined gingival contour E and the other parameters discussed. Figure 6 , which regions shown as filled with material (dotted regions) can be removed during the transformation are shown by way of example.

[0065] Figure 7a The illustration shows a three-dimensional representation 10 of a three-dimensional computer model 1 of a patient's jaw with a patient-specific abutment 2 , which can be read out by a computer 3 .

[0066] exist Figure 7b Removed in Figure 7a This allows a view of the upper region of the pin-shaped dental implant 12. The abutment 2 is embedded with its connecting structure 5 into said upper region of the pin-shaped dental implant 12. Figure 7c Gingival mask is shown (however, in Figure 7a and 7b The gum mask is not provided).

[0067] Figure 7d An abutment 2 having a prosthetic supply body in the form of a tooth crown produced according to the method of the invention is shown.

[0068] Reference numerals list

[0069] 13D computer model of the patient's individual abutment

[0070] 2 abutments

[0071] 3. Computer

[0072] 4. The base of the abutment

[0073] 5. Connection structure

[0074] 6 Approximate crown-shaped platform surface

[0075] 7 spiral channel

[0076] 8 Electronic memory

[0077] 9 Three-dimensional computer model of the patient's individual abutment

[0078] 10 3D images of the patient's jaw

[0079] 11 Manufacturing Equipment

[0080] 12Dental Implants

[0081] E-abutment transgingival contour

[0082] The central imaginary axis of the Z base's connecting structure

[0083] d1 Material thickness of the platform of the abutment

[0084] Material thickness of the platform of the d2 abutment

[0085] d3 Material thickness of the wall of the spiral channel of the abutment

[0086] R1 is the transition radius between the crown-shaped platform surface and the base of the abutment.

[0087] R2 Transition radius of the transition between the base of the abutment and the wall of the spiral channel

Claims

1. Method for producing a three-dimensional computer model (1) of a patient-specific abutment (2) for a dental implant (12) by means of a computer (3), wherein: The base (2) comprises: at least one base (4), a connecting structure (5) for connecting the base (2) to a pin-shaped dental implant (12), a platform surface (6) of the base (2) for supporting a platform of a prosthesis supply body and oriented toward the prosthesis supply body, and a spiral channel (7) for fixing the base (2) to the pin-shaped dental implant (12). The method comprises at least the following steps: - providing a three-dimensional representation (10) of the patient's jaw, at least in the region of the jaw where the abutment (2) is to be placed, which can be read by a computer (3), - the definition of the preparation boundaries for the three-dimensional geometry of the platform is selected by the operator of the computer (3) or by an algorithm according to the individual gingival course of the patient where the abutment (2) is to be placed, - defining, by an operator of the computer (3) or by an algorithm, the three-dimensional geometry of the abutment (2) above the boundaries of the preparation for the three-dimensional geometry of the platform, - defining the gingival contour (E) of the abutment (2) by an operator of the computer (3) or by an algorithm, - providing a three-dimensional computer model (1) by means of a computer (3), The invention is characterized in that a disk-shaped configuration of a platform surface (6) oriented toward the prosthesis supply body is provided below the preparation body boundary for the three-dimensional geometry of the platform, and the material thickness (d1) of the platform of the abutment (2) is selected by an operator of a computer (3) based on a defined gingival penetration contour (E) within a predetermined range stored in an electronic memory (8).

2. Method for producing a three-dimensional computer model (1) of a patient-specific abutment (2) for a dental implant (12) by means of a computer (3), wherein: The base comprises: a base (4), a connecting structure (5) for connecting the base (2) to a pin-shaped dental implant (12), a platform surface (6) of the base (2) for supporting a platform of the prosthesis supply body and directed toward the prosthesis supply body, and a spiral channel (7) for fixing the base (2) to the pin-shaped dental implant (12). The method comprises at least the following steps: - providing a three-dimensional starting computer model (9) of the patient's individual abutment (2), the three-dimensional starting computer model (9) representing the abutment, wherein the three-dimensional starting computer model (9) has such a shape that the area extending radially between the spiral channel (7) of the abutment (2) and the transgingival contour (E) of the abutment (2) is shown as being filled with material, - A transformation is carried out with the aid of a computer (3) so as to obtain a three-dimensional computer model (1) from a three-dimensional starting computer model (9), in which a disk-shaped configuration of a platform surface (6) oriented toward the prosthesis supply body is arranged below the three-dimensional geometric preparation boundary for the platform, and the three-dimensional computer model has a material thickness (d1) of the platform of the abutment (2) selected by an operator of the computer (3) based on a defined gingival penetration contour (E) within a predetermined range stored in an electronic memory (8).

3. The method according to claim 1 or 2, wherein: The operator of the computer ( 3 ) further selects a material thickness ( d 3 ) of the wall of the spiral channel ( 7 ) within a predefined range stored in the electronic memory ( 8 ).

4. The method according to claim 1 or 2, wherein: The material thickness (d2) of the base (4) of the base table (2) is selected by an operator of the computer (3) within a predefined range stored in an electronic memory (8).

5. The method according to claim 1 or 2, wherein: - for a first transition between a platform surface (6) oriented toward the prosthesis supply body and a base (4) of the abutment (2), and / or - for the second transition between the base (4) of the base (2) and the wall of the spiral channel (7), The transition radii (R1, R2) are selected for the first transition and the second transition within a predetermined range stored in an electronic memory (8).

6. The method according to claim 5, wherein: Depending on the material to be used for the abutment (2) and / or depending on the defined three-dimensional geometry of the abutment (2) above the preparation boundary for the three-dimensional geometry of the platform, a corresponding range of possible selections of material thicknesses (d1, d2, d3) or a corresponding range of transition radii (R1, R2) is selected.

7. Method for producing a patient-specific abutment (2) for a dental implant (12) using a three-dimensional computer model (1) produced by the method according to any one of claims 1 to 6.

8. The method according to claim 7, wherein: A patient-specific abutment (2) for a dental implant (12) is produced by an additive manufacturing method. 9 . A computer program product comprising instructions which, when the program is executed by a computer ( 3 ), cause the computer to carry out the method according to claim 1 . 10 . A computer-readable storage medium comprising instructions which, when executed by a computer ( 3 ), cause the computer to carry out the method according to claim 1 . 11 . A computer-readable data medium on which a computer program product according to claim 9 is stored.

12. Data carrier signal transmitting a computer program product according to claim 9.

13. A computer configured to carry out the method according to any one of claims 1 to 8 and / or to execute the computer program product according to claim 9.

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