METHOD FOR GENERATING A MODEL OF A DENTAL REPLACEMENT PART

Abstract

The invention relates to a method for generating a digital model (6) of a dental replacement part, formed by a dental prosthesis and a prosthesis base having a rear protection plate, and for producing a dental replacement part of this type, wherein, in a digital model (1) of a jawbone to be provided and a digital dental prosthesis model (2) positioned therein, an interface (3) is automatically and/or manually marked in the region of the dental prosthesis model (2), a rear protection plate model (4) is formed by the interface (3), an abutting surface (1′) of the digital jawbone model (1) and a region of a surface (2′) of the dental prosthesis model (2) joining the surface (1′) and the interface (3), a revised dental prosthesis model (5) is formed from the digital dental prosthesis model (2) by adopting the interface (3) as a surface, and the digital model (6) of the dental replacement part is created from the rear protection plate model (4) and the revised dental prosthesis model (5).

Claims

1. Method for generating a digital model of a dental replacement part including a dental prosthesis and a prosthesis base having a rear protection plate, the method comprising the steps of: providing a digital model of a jawbone or a jawbone section having a digital dental prosthesis model positioned therein, wherein an interface is automatically and/or manually marked in a region of the dental prosthesis model, forming a rear protection plate model by the interface, an abutting surface of the digital jawbone model, and a region of a surface of the dental prosthesis model joining the surface of the digital jawbone model and the interface, forming a revised dental prosthesis model from the digital dental prosthesis model by adopting the interface as a surface, and producing the digital model of the dental replacement part from the rear protection plate model and the revised dental prosthesis model.

2. Method according to claim 1, wherein the interface is produced by moving a starting surface, marked automatically and/or manually on an oral surface of the dental prosthesis model and/or of the digital jawbone model, by a specified depth (T) in a substantially vestibular direction.

3. Method according to claim 2, wherein the starting surface is marked by marking a circumferential line.

4. Method according to claim 2, wherein the movement of the starting surface occurs along a direction which takes into consideration a direction of insertion for the dental replacement part.

5. Method according to claim 1, wherein the interface is changed manually and/or automatically after being marked.

6. Method according to claim 1, wherein the interface is automatically and/or manually reinforced in a region abutting the surface of the digital model of the jawbone.

7. Method according to claim 1, wherein an element overlapping the interface is marked automatically or manually.

8. Method according to claim 7, wherein the overlapping element is integrated into the rear protection plate model and/or the revised dental prosthesis model.

9. Method according to claim 1, wherein one or more corners of the interface are automatically rounded.

10. Method according to claim 1, wherein a recess or protrusion is manually and/or automatically integrated into the interface as a connecting element.

11. Method for producing a dental replacement part having a dental prosthesis and a prosthesis base having a rear protection plate, the method comprising the steps of producing the dental replacement part on the basis of a digital model, generated according to claim 1, of the dental replacement part.

12. Method for producing a dental replacement part according to claim 11, wherein a template is produced on the basis of the revised dental prosthesis model, which template has a recess, the shape of which corresponds to a negative form of a vestibular surface, extending to the interface, of the revised dental prosthesis model.

13. Method for producing a dental replacement part according to claim 12, wherein the template is designed to have several parts.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Exemplary embodiments of the invention are depicted in the drawings. In the drawings,

[0032] FIG. 1 shows a digital model of a jawbone to be provided with a digital dental prosthesis model positioned therein,

[0033] FIG. 2 shows a cross-sectional profile of the model according to FIG. 1 in the region of the positioned digital dental prosthesis model,

[0034] FIG. 3 shows a marking of a starting surface in a model according to FIG. 1,

[0035] FIG. 4 shows the cross-sectional profile from FIG. 2 with a changed interface and an overlapping element,

[0036] FIG. 5 shows a model, produced according to the invention, of a dental replacement part, and

[0037] FIG. 6 shows a template according to the invention.

EXEMPLARY EMBODIMENTS

[0038] FIG. 1 shows a digital model 1 of a jawbone to be provided, which model can, for example, be produced by means of a scan using an intra-oral camera. In the digital model 1, a digital dental prosthesis model 2, which is illustrated in a shaded manner for better identifiability, is positioned at flaws of the jawbone to be provided.

[0039] FIG. 2 shows a cross-sectional profile of the digital model 1 depicted in FIG. 1 in the region of the dental prosthesis model 2. According to the method according to the invention, an interface 3, which can be seen in the cross-sectional profile of FIG. 2 as a profile, is marked in the dental prosthesis model 2. The interface 3 extends from a surface 2′ of the dental prosthesis model 2 to a surface 1′ of the digital model 1 of the jawbone. This interface 3 serves as interface between a rear protection plate model 4 to be produced and a revised dental prosthesis model 5, which serve as the basis for a dental replacement part model 6 (not shown in FIG. 5) to be produced.

[0040] The rear protection plate model 4 is formed by the interface 3, an abutting section of the surface 1′ of the digital model 1 of the jawbone, and a section of the surface 2′ of the dental prosthesis model 2, which section extends orally between the surface 1′ of the digital jawbone model 1 and the interface 3.

[0041] The revised dental prosthesis model 5 is formed by the digital dental prosthesis model 2 and the interface 3 so that the section, occupied by the rear protection plate model 4, of the dental prosthesis model is cut off or removed, so to speak, by the interface 3.

[0042] The interface 3 can be marked manually, e.g., by means of an input device, such as a mouse. This can, for example, be carried out by a marking of the entire surface or even by a marking of a line delimiting the surface. An automatic marking of the interface 3 is also possible. For this purpose, a starting surface 8 can, for example, be automatically estimated or manually marked on an oral surface 7 of the dental prosthesis model 2 (FIG. 3). The interface 3 is then produced in the dental prosthesis model 2 by a substantially parallel movement of the starting surface 8 in the vestibular direction.

[0043] A depth T is specified as the distance of the movement (FIG. 2). This corresponds, for example, to a typical thickness of a rear protection plate of 0.6 mm, for example. For the automatic movement, the starting surface 8 is, for example, parameterized, wherein a previously defined insertion axis of the dental replacement part to be produced is advantageously taken into account with respect to the parameterization and with respect to the direction of the movement.

[0044] The interface 3 produced in this way can still subsequently be changed, or optimized manually and/or automatically. In order to increase the stability, an overlapping retaining element is generally provided between the dental prosthesis and the rear protection plate, for example. This retaining element can first be marked and positioned in the profile of the digital model 1, e.g., in the manner illustrated in FIG. 4, as overlapping element 9, i.e., as an element protruding beyond the interface 3 on both sides. Subsequently, the shape of the overlapping element 9 is adopted in the digital model 6 to be generated of the dental replacement part such that the shape of the overlapping element 9 is completely adopted in the shape of one of the two abutting components or models 4, 5 for the rear protection plate or the dental prosthesis, and the other component or model 4, 5 has a corresponding recess.

[0045] Another variant for increasing the stability is to manually and/or automatically move the interface 3 a little further in the vestibular direction in a region abutting the surface 1′ of the jawbone model 1, so that the rear protection plate model 4 to be produced is reinforced in a region abutting the digital model 1 of the jawbone (FIG. 4). If the model 6 to be produced of a dental replacement part is designed with an overlapping element 9, it is particularly advantageous if such a reinforcement ends with the overlapping element 9, such that the rear protection plate model 4 has, at least in a region of the overlapping element 9 and in a region located between the overlapping element 9 and the surface 1′ of the jawbone model 1, a depth T′ that is greater than the specified depth T.

[0046] The rounding of the corners, furthermore, adds to the increase in stability, so that the corners are, for example, designed as fillets. For this purpose, a rounding of the corners of the interface 3 is carried out manually and/or automatically, as can be seen by way of example in FIG. 4 in the profile of the interface 3 above the overlapping element 9. In particular, in an embodiment of the dental replacement part with an overlapping element 9, such as a retaining plate, the rounding of the abutting corner of the interface 3 is advantageous, since, especially, transitions of different materials are preferably to be designed in the manner of fillets or watch glass holders.

[0047] Another possibility for increasing the stability of the dental replacement part to be produced is the provision of at least one connecting element 10. An exemplary embodiment of such a connecting element 10 can also be seen in FIG. 4. The connecting element 10 consists of a recess on the part of the rear protection plate model 4 and a protrusion on the part of the revised dental prosthesis model, wherein the recess, as well as the protrusion, extend diagonally in an incisal or occlusal direction with respect to the interface 3, in the manner of a watch glass holder.

[0048] After a final determination of the interface 3, the rear protection plate model 4 and the revised dental prosthesis model 5 are, as already described, generated on the basis of this interface 3, the digital jawbone model 1, and/or the dental prosthesis model 2, and, if applicable, the overlapping element 9, and assembled and/or complemented to produce a dental replacement part model 6, as sketched in FIG. 5 in a shaded manner. The rear protection plate model 4 can, for example, be complemented by known method steps so as to produce a dental prosthesis base model for a dental prosthesis base with retaining devices for attaching the dental prosthesis to neighboring teeth.

[0049] The produced dental replacement part model 6 can, furthermore, be used to produce a dental replacement part consisting of a dental prosthesis base with a rear protection plate and a dental prosthesis. For this purpose, the dental prosthesis and the dental prosthesis base can be produced according to the respective model data, e.g., by casting processes or milling processes from appropriate, conventional materials, such as ceramic or metal.

[0050] If a dental prosthesis is already available and was, for example, the basis for the dental prosthesis model 2, it is particularly advantageous to produce, on the basis of the revised dental prosthesis model 4, a template 11, with which the dental prosthesis can be adapted to the revised dental prosthesis model 5. As shown in FIG. 6, the template 11 can, advantageously, have several parts. The individual parts of the template 11 can, advantageously, be connected to one another using unambiguously interconnecting keys, in order to avoid errors as a result of incorrect assembly.

[0051] The template 11 comprises a recess 12, the shape of which corresponds to a negative form of the revised dental prosthesis model 5, wherein an edge 13 of the recess 12 precisely corresponds to an edge of the interface 3. In this way, the already existing dental prosthesis (in this case, illustrated with dashes) can be inserted into the recess, and the protruding region can be removed, for example, by grinding.

LIST OF REFERENCE SYMBOLS

[0052] 1 Digital model of a jawbone to be provided [0053] 1′ Surface of the digital jawbone model 1 [0054] 2 Digital dental prosthesis model [0055] 2′ Surface of the dental prosthesis model 2 [0056] 3 Interface [0057] 4 Rear protection plate model [0058] 5 Revised dental prosthesis model [0059] 6 Dental replacement part model [0060] 7 Oral surface of the dental prosthesis model 2 [0061] 8 Starting surface [0062] 9 Overlapping element [0063] 10 Connecting element [0064] 11 Template [0065] 12 Recess [0066] 13 Edge [0067] T Depth [0068] T′ Depth