JP4215893B2 - Dental prosthesis building block - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a member used in an apparatus that performs automatic measurement based on computer control and automatic processing based on this measurement information. By using automatic measurement and automatic processing means typified by a CAD / CAM apparatus, precision dentistry and medical departments are provided. The present invention relates to a member for processing a prosthesis, other dental materials, medical materials, various imitations, and objects to be measured that are the same, similar or corresponding.
[0002]
[Prior art]
Most dental prostheses are hand-made by dental technicians. In this case, the skill of a dental technician is required, and the quality of the dental prosthesis varies greatly when it is further manufactured by a person. In order to solve this problem, a method of manufacturing by machining has been developed and is now being established. The machining block is in the shape of a ceramic prism, and is used only as an inlay. [0003]
[Problems to be solved by the invention]
Currently, there are prismatic dental prosthetic cutting blocks as materials for machining dental prostheses. When this prosthetic block is cut, the part used as the prosthesis and the holding part installed in the apparatus must be processed in a connected state. This connecting part is an unnecessary part when used as a prosthesis. Therefore, in order to lighten the burden of post-processing, it must be made as small as possible. However, since the amount of cutting at that time becomes large, a large burden is placed on a cutting tool such as a drill. Further, in order to cut deeply, a cutting tool having a long overall length, a blade length and an effective length is required. As the cutting tool becomes longer, the width of deflection and the amount of deflection become larger and the accuracy becomes worse. When a crown is manufactured from a block having a square processed part, parallel cutting is used as a cutting method, and contour cutting is performed while drawing a square. In these methods, since there is a change of direction of the moving cutting tool, acceleration / deceleration is required and cutting time is required.
[0004]
[Means for Solving the Problems]
According to the present invention, a support portion having a shape close to a connecting portion with a holding portion is attached to a processing portion for producing a prosthesis. An object of the present invention is to provide a prosthetic block in which a holding part for attaching to the apparatus is attached to the support part.
The shape of the support portion is not basically limited as long as it is a support portion such as a prism, a cylinder, a quadrangular pyramid, a triangular pyramid, or a cone. Moreover, the direction of a process part and a holding part is preferable for the surface of a circle. The material of the processed part may be any material used in dentistry. The material of the holding part is not particularly limited, but metal is preferable in consideration of cost and mechanical strength. By attaching a support portion to this processed portion, the amount of cutting of the connecting portion with the holding portion is reduced. Moreover, the depth of cut becomes shallow.
In consideration of cutting the crown, the product portion of the processed portion is preferably cylindrical. By using a cylindrical shape, the cutting tool can be moved to contour lines on a circle, and the acceleration / deceleration width is small and can be performed at a constant speed.
[0005]
[Action]
It is considered that when the connecting portion is cut, the length of the tool to be cut can be shortened by attaching the support portion to the processed portion, and the shake and deflection of the cutting tool, which are problems, are eliminated. By making the processed portion cylindrical, the acceleration / deceleration width of the cutting tool can be reduced, and the cutting time can be shortened.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The present invention should be configured and processed with a support material between a processing member for cutting with a machine tool to form a desired shape and a connecting material for connecting the machine tool and the processing member. FIGS. 2 and 3 show a model formed in advance for obtaining shape data and a connecting material for connecting the model and the measuring machine. An example of the combination of the three is shown in FIGS.
Reference numeral 18 denotes a processing part, which is a processing material to be processed by a driving tool having a drill and a scissors. Ceramics, resins, metals (noble metal compounds such as titanium, titanium alloys, silver, etc.) And the like. Preferably, a material having free machinability and affinity for a living body is used. Specifically, feldspar is more preferable when considering aesthetics.
Although the size and shape depend on the machine for machining as described above, the present invention is a final representation represented by a prosthesis for a dental defect portion attached to one or more teeth. A size and shape approximately equal to or greater than the formation is preferred. As a general range, the width is about 2 to 20 mm for a single-tooth prosthesis. In the case of a one-tooth prosthesis (inlay, onlay, crown, etc.) as shown in FIGS. Further, in the case of a multi-tooth prosthesis (such as a bridge), a prism is preferable in consideration of the moldability of the block, and the attachment position of the support portion at that time is preferably the center of the long surface of the prism. In some cases, it may be attached to a short surface.
Reference numeral 19 denotes a processing portion support portion, and the material thereof is formed of the same material as that of the processing portion, but in the end, it is often deleted, so it is preferable that it has more free-cutting properties. For example, feldspar, alumina, etc. are exemplified. However, since the cutting tool differs depending on the material, the same feldspar as the processing part is preferable in that the processing part and the support part can be cut with the same cutting tool.
As for the metal material, titanium, titanium alloy, noble metal compounds such as silver, and other dental metal materials are exemplified as in the processed part.
The length depends on the cutting space of the cutting machine and is adjusted as appropriate within the range, but generally there is a problem with durability such as bending if it is long, and holding with the cutting tool if it is short. Since there exists a possibility of a contact with a part, the range of 1 mm-10 mm is preferable.
The size of the connecting surface with the machined part needs to support the machined part, so it cannot be made so small, and if it is made too large, the machined part will be complicated for cutting. 1 to 20 mm is preferable.
[0007]
It is preferable to use the same material for the processing portion 13 and the processing portion support portion 19, but in this case, it is preferable that the processing portion 13 and the processing portion support portion 19 be formed integrally. Other combinations using an adhesive may also be used. Reference numeral 20 denotes a holding portion, and 21 denotes a holding portion stopper, which is a means for connecting to a cutting machine. In the drawing, the cross section is formed so as to be equal to the cross sectional area of the processing portion support portion.
The reason is, support portions for cutting, but should be short, relief width of the cutting tool to some extent necessary, the use case escape width of the supporting portion cutting tool is large or the support portion is larger than the cutting tool However, this is to enable the setting so that the cutting tool does not hit the stopper of the holding portion.
In the range, it adjusts suitably. In this embodiment, the combination of the processing part support part is shown in the processing part, but this support part is connected and attached to a model (14 in FIG. 1) for obtaining the original data when performing the cutting process. If the Ru mower. In the case of a single-tooth prosthesis (inlay, onlay, crown, etc.), a cylindrical shape is appropriate. In addition, the said support part plays the auxiliary | assistant at the time of cutting a process part, and a part of support part may be used as a process part. That is, if the final shape obtained by processing the processed portion has a protruding portion, this support portion can be that portion. In addition, when the processing part is large or when it is a prosthesis used across a plurality of teeth, when one support part cannot sufficiently support the aspect, the plurality of support parts are connected to the processing part. In addition, since the prosthesis has a complicated shape, if it is necessary to take a wide processing portion, the support portions are formed as a processing portion with a size that reduces the contact surface with the processing portion. A mode of connection can also be adopted. In this case, since a plurality of holding portions are mounted to be connected to the plurality of support portions, the processing apparatus side needs to have a configuration having a portion connected to all the holding portions. However, it is not always necessary to connect the plurality of holding units and all of them, and a processing apparatus having a portion connected to one holding unit may be used as long as at least processing can be performed. Furthermore, even if the processing part is connected to a plurality of support parts, if this support part can be converged into one, the converging part and one holding part can be connected to connect to the processing apparatus. As one, a complex prosthesis can be processed without exchanging a processing device or a part thereof.
[0008]
【Example】
The cutting apparatus used in this embodiment is based on an NC machine tool that is used as a machine for processing a die or the like. With this device, the crown of the dental prosthesis was ground. However, an NC machine tool that cuts a general mold or the like is large, and the cutting accuracy is not suitable for a medical material or a dental material.
Therefore, the cutting machine tool 3 shown in FIG. 1 is reduced in size and improved in cutting accuracy. The NC machine tool 3 in FIG. 1 is divided into a three-dimensional shape measurement area 4 and a three-dimensional machining area 5. In the three-dimensional shape measurement area 4, a three-dimensional shape measurement probe 6 with a contact element 8 is installed. The three-dimensional shape measurement probe 6 is on the X, Y, and Z axis tables, and can be moved three-dimensionally.
An AC servo motor with an encoder was used for the power of each shaft. A spindle motor 7 is installed in the three-dimensional processing area 5. Similar to the three-dimensional shape measurement area 4, the spindle motor 7 can also be moved three-dimensionally. The operation was controlled by connecting the personal computer 2 to the NC machine tool 3. Further, for the purpose of cooling and removing processing waste from the workpiece, a water injection nozzle 16 was provided, and the three-dimensional processing area 5 was waterproofed. The jig 10 for installing the jig 11 to which the measurement model 17 in the three-dimensional shape measurement area 4 is attached and the jig 9 for attaching the workpiece 14 in the three-dimensional machining area 5 are connected to each other. The jig 9 can be rotated by an AC servo motor with an encoder used for power. When the measured data is processed as it is, the measurement model 17 is processed into a mirror-inverted shape.
Therefore, the data once measured is reversed by the personal computer 2 with the X axis and the Y axis mirror inverted, and sent to the NC machine tool for processing. A dental prosthesis block shown in FIG. 2 was prepared. The processed part 18 was made cylindrical for the crown, and the cylindrical support part 2 was attached to the curved part. The material of the processing part 18 and the processing part support part 19 is porcelain used in dentistry and is an integral type. The holding part 20 and the holding part stopper 21 to be attached to the apparatus are integrated and aluminum is used. The holding part 20 is a part gripped by the machining apparatus. The holding portion stopper 21 is for the purpose of specifying the portion where the holding portion 20 is inserted into the machining device fixing portion, and determines the position of the processing portion. The surfaces of the processed part support part 19 and the holding part stopper 21 were fixed with an ordinary acrylic adhesive. The figure projected from each direction at that time is shown as follows.
[0009]
In FIG. 3, (a) is a front view of a dental prosthesis block, (b) is a left side view, (c) is a plan view, (d) is a rear view, (e) is a right side view, and (f) is a bottom view. FIG.
[0010]
The shape of the crown was measured with the cutting machine tool 3 and processed into data for cutting with the personal computer 2. After that, contour cutting of the crown shape on the circle was performed with a diamond bar 24.
FIG. 4 is a diagram in which the coupling portion data 23 between the crown shape data 22 and the holding portion stopper 21 is matched to the cutting block. FIG. 5 shows contour cutting of the occlusal surface on a circle. When the processing of the occlusal surface is completed, it is inverted 180 degrees. FIG. 6 shows the cutting process of the abutment tooth surface after being reversed by 180 degrees. The block cut into the crown shape is removed from the cutting machine tool 3. Thereafter, the crown 27 is manually cut off and polished to complete. Although the blade length 29 of the diamond bar 24 is adjusted to the connecting portion 28, it is only necessary to match the abutment tooth surface of the crown 27. Further, the blade length 29 can be shortened, and the amount of shake and deflection is reduced. The above-described embodiment is a more specific description of the present invention, and the present invention is not limited to this example.
[0011]
【The invention's effect】
By attaching the processing part support part to the cutting block for dental prosthesis, the amount of cutting at the connecting part of the processing part and the holding part was reduced. As a result, cutting time was shortened, cutting tool life was extended, and cutting accuracy was improved.
[Brief description of the drawings]
FIG. 1 is a diagram showing an example of the configuration of a cutting apparatus.
FIG. 2 is a view showing an embodiment of a cutting block for a dental prosthesis.
3A is a front view of a cutting block for a dental prosthesis, FIG. 3B is a left side view of the cutting block for a dental prosthesis, FIG. 3C is a plan view of the cutting block for a dental prosthesis, and FIG. The rear view of the cutting block for dental prosthesis, (e) The right view of the cutting block for dental prosthesis, (f) The bottom view of the cutting block for dental prosthesis is shown, respectively.
FIG. 4 is an explanatory diagram for explaining a case where crown and connecting portion shape data are superimposed on a cutting block according to the present embodiment.
FIG. 5 is a view for explaining occlusal surface cutting in the present embodiment.
FIG. 6 is a view for explaining abutment tooth surface cutting in the present embodiment.
[Explanation of symbols]
1 CRT of general-purpose personal computer
2 General-purpose personal computer 3 Machine tool body 4 3D shape measurement area 5 3D machining area 6 3D shape measurement probe 7 Spindle motor 8 Contact element 9 Jig for gripping the workpiece (rotatable)
10 Jig for gripping the object to be measured (rotatable)
11 Abutment tooth model mounting jig 12 Cable for sending three-dimensional shape measurement data to a general-purpose personal computer 13 Cable for sending data to control NC machine tools 14 Ceramic block (Poseren block)
15 Diamond Bar 16 for Grinding Process 17 Nozzle 17 for Water Injection Processing Abutment Tooth Model 18 Cutting Block Processing Section 19 Cutting Block Supporting Section 20 Cutting Block Holding Section 21 Cutting Block Holding Section Stopper 22 Crown Shape Data 23 Connection portion data 24 Diamond bar 25 Crown occlusal surface 26 after processing Crown connection portion 27 when processing the crown occlusion surface Crown 28 after processing Connection portion 29 after processing Diamond bar blade (diamond electrodeposition portion)

Claims (4)

 A cylindrical processed portion (18) cut to form a dental prosthesis, a cylindrical shape mainly formed of a member that can be cut and integrated with the curved surface of the side surface of the processed portion The support part (19) provided is formed as one part of a holding part (20) having one end having an area substantially equal to the contact section of the support part (19) and adhesively connected to the support part (19). A dental prosthesis forming block comprising a cylindrical holding part (20) provided with a holding part stopper (21) and having a part attached to the machining device at the other end. 2. The dental prosthesis forming block according to claim 1, wherein the support portion forms a columnar shape having a major axis direction connecting the processing portion and the holding portion. The processing unit and the support unit, feldspar, made of ceramics such as alumina claim 1, 2 dental prosthesis for forming blocks described. The dental prosthesis forming block according to claim 1, wherein the support portion has a length of 1 mm to 10 mm, and has a length that prevents at least the cutting tool and the holding portion from contacting each other. .

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