JP2016030158A - Prosthetic appliance machining method and prosthetic appliance machining device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a novel prosthetic appliance machining method and machining device effectively using a dental model prepared mainly for checking and verifying a fixing state of the prosthetic appliance, as holding means when three-dimensionally machining a prosthetic appliance material block.SOLUTION: The prosthetic appliance machining method according to the present invention comprises: creating a pseudo tooth base 10 representing a crown shape of an abutment tooth T on the basis of denture mold data of a patient P, and forming, on the pseudo tooth base 10, a suction hole 13 communicating from the crown to another external surface; reversing concave-convex relationship of three-dimensional data of the crown in the pseudo tooth base 10 to cut a joining part W2 in a prosthetic appliance material block WB; and then installing the prosthetic appliance material block WB on the crown of the pseudo tooth base 10, with it brought into close contact with the crown, applying vacuum air to the suction hole 13 of the pseudo base 10, and three-dimensionally cutting a body surface W3 of the prosthetic appliance material block WB, with the prosthetic appliance material block WB held by the pseudo tooth base 10.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a method for processing a dental prosthesis and a processing apparatus therefor.

There are various methods of dental treatment, and it is the most appropriate method considering many factors such as the condition of the teeth to be treated and the surrounding jaw, and the health condition of the patient to be treated (treated person). Has been adopted.
Of these, in recent years, as shown by the implant technique, the abutment is constructed by artificially creating a tooth base (abutment tooth), or the natural tooth of the individual is utilized as much as possible, and only the affected part of the tooth top is excised. Thus, a technique in which a prosthesis called a crown or a bridge is provided (covered) on such a tooth base has attracted attention (see, for example, Patent Documents 1 to 3).

  In such dental treatments, prosthetics such as crowns and bridges are made from super hard resin or ceramic material blocks (hereinafter referred to as prosthetic material blocks), adjacent teeth of teeth to be treated, occlusal teeth, etc. In consideration of the above situation, three-dimensional machining is performed so as to reproduce the desired tooth shape. Needless to say, such a process requires means for fixing the prosthetic material block WB ′ to the work frame of an automatic cutting machine (milling machine) M, as shown in FIG.

For this reason, the prosthetic material block WB ′ is fixed to the support base D with the stay S and supplied to the milling machine M as shown in FIG. 3, and the stay S on the support base D is appropriately transferred to the milling machine M. It is configured to be held by a clamp. In this state, the cutting blade 7 'is applied to the prosthetic material block WB' to process it into a required three-dimensional shape.
Further, during this processing, in order to keep the processing portion of the prosthetic material block WB ′ in a fixed posture, the cutting is performed while leaving the runner portion R connected to the support pedestal D, and the overall processing (shape) After the cutting is finished, the clamp on the support base D is released, the entire work piece (the prosthetic material block WB ′ after the cutting process) is taken out, and this runner part R is cut separately by hand. The surface is finished smoothly to complete a prosthesis W ′ such as a crown.

In FIG. 3, only one cutting blade 7 ′ for processing the prosthetic material block WB ′ is drawn. However, in the case of a crown, for example, the surface side of the prosthetic material block WB ′ (abutment) Two cutting blades so as to cut separately the side exposed to the oral cavity when covered with teeth and the inner surface side (the side that does not expose when exposed to the abutment teeth) It is common to provide 7 '.
Of course, in the processing of the prosthetic material block WB ′, the runner portion R is secured by selecting the simplest shape surface portion of the prosthetic material W ′. Separation in the runner part R from D and smooth hand finishing of the runner part R thereafter required a certain number of man-hours and high skills.
In addition, when the material of the prosthetic material block WB ′ is zirconia, the material itself is extremely hard, so that the runner portion R cannot be easily folded and corrected.

  By the way, although such a prosthesis W 'may be directly processed by a dentist, many are performed by a dental technician having specialized processing skills. At this time, the processed prosthesis W ′ is handed over to the dentist not only at the treatment site (prosthesis W ′) that is conventionally required for direct treatment but also around the tooth to be treated (neighboring teeth and occlusal teeth). Etc.), and a dental model (abutment model) is reproduced and delivered with the prosthesis W ′ installed (covered) on the dental model. By the way, it seems that such delivery form has become common practice because of the requirement to check the fit of the prosthesis W ′ and to verify the finish. The dental model is discarded without being used directly.

JP 2005-168825 A JP 2007-209575 A JP 2012-24396 A

  The present invention has been made by recognizing such a background, and pays attention to the existence of a dental model that has been prepared only for confirmation / verification of the stored state of a prosthesis in the past. The present invention has been completed from the viewpoint that it can be used as a holding means when three-dimensionally processing a material block. That is, the present invention has a technical problem to develop a novel prosthesis processing method and apparatus that can eliminate the cutting and finishing operations of the runner portion after the cutting work that has been conventionally performed.

The prosthesis processing method is:
A method of processing a dental prosthesis by three-dimensionally cutting a hard prosthesis material block,
Creating a pseudo tooth base that reproduces the base of the tooth to be treated with a model (pseudo tooth base processing step);
<Joint processing step of prosthesis> to form a joint part to be joined in close contact with the top of the created pseudo tooth base in a prosthesis material block;
Forming the main body surface other than the joint portion in the prosthetic material block, comprising <main body surface processing step of the prosthesis>
In the <pseudo tooth base processing step>, after obtaining the tooth type data of the patient as three-dimensional data, based on this data, a pseudo tooth base that reproduces the top shape of the base portion is created, and the pseudo tooth base is created. It forms a suction hole that communicates with the other outer surface from the top,
In the <prosthetic joint processing step>, the concave and convex relationship of the top three-dimensional data in the pseudo tooth base is reversed, and the joint is cut into the prosthetic material block,
In the <prosthesis main body surface processing step>, the prosthesis material block on which the joint portion is formed is installed so as to be in close contact with the top of the pseudo tooth base, and vacuum air is applied to the suction hole of the pseudo tooth base. The body surface of the prosthetic material block is three-dimensionally cut in a state where the prosthetic material block is held on the pseudo tooth base to obtain the desired prosthetic shape.

  Further, in creating the pseudo tooth base in the <pseudo tooth base machining step>, it is preferable to create the tooth base by cutting from a hard pseudo base block of a certain size.

The prosthesis processing device
A cutting blade that is supported by a spindle and rotates;
A work stand for holding the work,
A device that holds a hard prosthetic material block on a work base, three-dimensionally processes the prosthetic material block into a desired three-dimensional shape based on appropriate cutting data, and processes a dental prosthesis,
In holding the prosthetic material block on the work cradle, the prosthetic material block is held via a pseudo tooth base having a top shape to be a base of the tooth to be treated,
In addition, the pseudo tooth base is formed with a suction hole that communicates with the other outer surface of the pseudo base block from the apex where the prosthesis material block is in close contact. It is attached to the gantry and vacuum air is applied to the suction hole of the pseudo tooth base so that the prosthetic material block is adsorbed and held on the pseudo tooth base attached to the work base.

  Moreover, it is preferable that the said work stand is installed on the surface plate of a prosthesis processing apparatus, and it is comprised so that the installation position can be changed suitably.

  The prosthesis processing method forms a joint with the same three-dimensional data (reverse concave and convex relationship) as the top of the pseudo tooth base (prosthesis placement part) in the prosthesis material block and adheres it to the top of the pseudo tooth base The prosthesis material block is placed on the dentition with vacuum air and held on the pseudo tooth base, and the body surface of the prosthesis material block is cut out, so cutting is performed from the prosthesis material block that does not have a stay or support base. Therefore, it is not necessary to leave the runner part as in the prior art (it is not necessary to secure it), and work such as excision of the runner part and smooth polishing of the excision mark becomes unnecessary.

  In addition, if various pseudo tooth bases are cut out from a pseudo base block of a certain size in the <pseudo tooth base machining step>, the original block portion that becomes the bottom surface can be obtained by cutting out only the top shape of the pseudo tooth base. Can be used as it is as a seating surface to be fitted (attached) to the prosthesis processing apparatus, and it does not take time and effort to process the seating surface.

  In addition, if the work gantry installation position can be changed on the surface plate of the prosthesis processing device, the prosthesis material block can be sucked and held at any position (fixed at any position). The body surface can be easily processed.

It is explanatory drawing which shows an example from "formation of an abutment tooth" to "creation of a pseudo tooth base" in steps in the prosthesis processing method of this invention. In the prosthesis processing method of this invention, it is explanatory drawing which shows an example from "cutting out the joint part of a prosthesis" to "completion of a prosthesis" in steps. It is explanatory drawing which shows the conventional method which carved out the prosthesis from the prosthetic material block which has a stay and a support base in skeleton form.

  The mode for carrying out the present invention includes one described in the following embodiments, and further includes various methods that can be improved within the technical idea.

  In the following description, the prosthesis processing apparatus 1 will be described together with the overall flow of the prosthesis processing method, that is, the processing method of the prosthesis W.

(1) Grasping the current situation (understanding the symptoms) and determining the treatment policy
First, the state of the teeth (affected part) of the patient P is grasped, and this includes X-ray imaging of the entire oral cavity or the affected part of the patient P, and further, the dentist visually or palpates the affected part (treated part). And examine the condition of the affected part (tooth, cervical, gingiva, root, etc.).
It should be noted that the past treatment status of the patient P can be roughly grasped by such grasping of the current situation, and the treatment policy is determined in consideration of such various situations comprehensively.
Here, in the following description, a crown is mainly assumed as the prosthesis W, and a treatment mode in which the crown is placed (installed) on a tooth base (an abutment tooth T) serving as a base of the tooth is illustrated (FIG. 1A). )reference). Incidentally, other methods for treating teeth include bridges, inlays, onlays, implants, dentures (partial dentures / total dentures), and the like.

(2) Formation of an abutment tooth In actual treatment, for example, as shown in FIG. 1 (a), an abutment tooth T that becomes a base of a tooth is first formed according to the condition of the root, etc. There are abutment construction in which the abutment tooth T is artificially created, or a method in which only the affected part of the top of the tooth is excised to make the abutment tooth T by utilizing the natural tooth of the patient P as much as possible.

(3) Acquisition of dental mold data After the abutment tooth T is formed, the intraoral area of the patient P is imaged by the 3D optical camera C as shown in FIG. Three-dimensional data of the base tooth T and its surroundings (neighboring teeth and occlusal teeth) are acquired. In addition, what is shown in FIG.1 (b) -ii) is an image of the acquired tooth type data (three-dimensional data).
Incidentally, in FIG. 1 (b) -ii), the shape of the prosthesis W to be placed (installed) on the abutment tooth T is not shown, but by acquisition of the tooth type data, that is, for the adjacent tooth and the occlusal tooth. The optimal prosthesis W can be analyzed and created from the shape, the meshing state, etc., and obtained as three-dimensional data.
In addition, the method of acquiring the tooth pattern data on the computer using such a 3D optical camera C is not a technique of actually making an impression material such as alginate by biting the patient P. There is no burden or unpleasant feeling, and an accurate prosthesis W can be obtained in a short period (short time). Of course, depending on the request of the patient P or the like, it is also possible to actually mold with an impression material such as alginate and acquire tooth pattern data from the mold (dental model).
In addition, tooth type data may be collected before starting the excision of the affected area (decayed tooth). This is mainly related to the positional relationship with the adjacent teeth and the gap between the teeth and the occlusal teeth before treatment. This is used when you want to confirm the above.

(4) Processing of pseudo tooth base (prosthesis installation part) After that, a model of the abutment tooth T, which is the base of the tooth to be treated, is created based on the above-described tooth type data (three-dimensional data in the oral cavity). Yes (the created model is assumed to be a pseudo tooth base 10), and the pseudo tooth base 10 is shaved from a rectangular base or cubic pseudo base block 10B having a certain size, for example, as shown in FIG. 1 (c) -i). Is issued. In this case, the bottom of the pseudo base block 10B is used as a seating surface 11 and is fitted into the pseudo base block fixing device 2 (hereinafter sometimes simply referred to as the fixing device 2), and the pseudo base block 10B is fixed by the clamp 21 or the like. is there. Here, for example, a hard plastic material is applied as the pseudo base block 10B.
Thereafter, as shown in FIG. 1 (c) -ii), the rotating cutting blade 22 is applied to the fixed pseudo base block 10B, so that the top of the pseudo tooth base 10 is the top shape of the abutment tooth T of the patient P. Process it on the street. Here, since the top part of the pseudo tooth base 10 is an installation part when the prosthesis W is covered, the part is referred to as a prosthesis installation part 12.

(5) About the seat surface side of the pseudo tooth base Note that the seat surface 11 side of the pseudo tooth base 10 in the state clamped to the fixing device 2 is the original block shape and is not subjected to any cutting. The part is fitted to a prosthesis processing apparatus 1 (work platform 4) described later, and the pseudo tooth base 10 is attached.
Incidentally, since the conventional crown forming method is often cut out from a block material similar to the above-described pseudo base block 10B, the present invention can be followed by the same method when processing the pseudo tooth base 10 in the present invention. There is an advantage that no processing equipment is required. In addition, the producers are used to the processing work and the operation of the equipment, and there is a sense of security.
In addition, in order to create the pseudo tooth base 10, that is, to form the prosthesis placement unit 12, it is possible to apply a 3D printer (a layered manufacturing method).

(6) Processing of pseudo tooth base (suction hole) Further, in this pseudo base block 10B (pseudo tooth base 10), as shown in FIG. Suction holes 13 communicating with other outer surfaces are formed. In this embodiment, two (two) suction holes 13 are formed. More specifically, the two suction holes 13 are formed in a penetrating manner in a straight shape from the top of the pseudo tooth base 10 to the opposing surface (seat surface 11).
The suction hole 13 is sucked in a state where the prosthetic material block WB is placed (installed) on the artificial tooth base 10 by applying vacuum air to the prosthetic material block WB, which will be described later. A holding hole for holding (holding and fixing the prosthetic material block WB as a workpiece).
Incidentally, in this figure, after the prosthesis installation part 12 was processed into the pseudo base block 10B, the suction holes 13 are formed, but this order may be reversed.

(7) Processing of prosthesis (joint part) Next, the shape of the joint part W2 of the prosthesis W is formed by cutting. Here, the joint part W2 refers to the prosthesis W to the pseudo tooth base 10. It is a part that contacts the pseudo tooth base 10 (prosthesis installation part 12) when covering (installing). Also in the processing, as in the processing of the pseudo tooth base 10, for example, it is cut out from a rectangular parallelepiped or cubic prosthetic material block WB of a certain size. Here, a plurality of prosthetic material blocks WB are prepared in advance, and the prosthetic material block WB having the color most suitable for the color of the natural tooth of the patient P is selected.
Then, in order to cut out the shape of the joint portion W2 from the prosthetic material block WB, as shown in FIG. 2 (d) -i as an example, the bottom portion of the prosthetic material block WB is used as a seating surface W1. The prosthetic material block WB is fixed by the clamp 31 or the like by being fitted into the material block fixing device 3 (hereinafter sometimes simply referred to as the fixing device 3).

Then, as shown in FIG. 2 (d) -ii) as an example, the base surface (here, the upper surface) of the prosthetic material block WB is cut into a concave shape (this becomes the joint portion W2). At this time, the concave-convex joint W2 is formed in the prosthetic material block WB by reversing the concavo-convex relationship of the three-dimensional data of the prosthetic placement unit 12 (top) in the pseudo tooth base 10.
Thereby, the joint part (concave shape) W2 of the prosthesis material block WB coincides with the prosthesis placement part 12 (convex shape) of the pseudo tooth base 10, and the prosthesis material block WB is covered on the pseudo tooth base 10 ( When installed, a stable mounting state can be obtained. That is, when the main body surface W3 of the prosthesis W to be formed later is formed, the prosthesis material block WB is put on the pseudo tooth base 10 and cut out in a state of being adsorbed, so that the prosthesis material is processed in the processing of the main body surface W3. Cutting can be performed reliably and precisely without shifting the block WB.
Further, as the prosthetic material block WB, for example, a material such as all ceramic, hybrid ceramic, zirconia, or the like is applied.

  If the pseudo base block 10B and the prosthetic material block WB have the same size (original size before processing), the fixing device 2 for fixing the pseudo base block 10B when the pseudo tooth base 10 is processed, and the prosthesis It can also be used as the fixing device 3 for fixing the prosthetic material block WB at the time of processing the object (when processing the joint portion W2). Further, the cutting blades 22 and 32 and the spindle (not shown) for supporting the same are also used. Can be used.

(8) Prosthesis processing apparatus After forming the joint portion W2 of the prosthesis W (prosthesis material block WB) as described above, the next is a main body surface W3 (a surface other than the joint portion W2) by the prosthesis processing apparatus 1. First, the prosthesis processing apparatus 1 that performs this processing will be described.
The prosthesis processing apparatus 1 is an apparatus that cuts out the main body surface W3 of the prosthesis material block WB (prosthesis W) into a desired three-dimensional shape. As an example, as shown in FIGS. 2 (e) and (f), A pseudo tooth base 10 on which the prosthetic material block WB is covered (installed), a work base 4 on which the pseudo tooth base 10 is placed in a stable state, a surface plate 5 on which the work base 4 is detachably attached, and a prosthesis It comprises a vacuum mechanism 6 for adsorbing and holding the material block WB on the pseudo tooth base 10 and a cutting blade 7 that is supported by a spindle and rotates. As described above, in the present invention, the work platform 4 indirectly holds the prosthetic material block WB via the pseudo tooth base 10 (not the mode in which the prosthetic material block WB is directly held by the work frame 4). .

(9) Suction path of the work platform For this reason, as shown in FIG. 2 (e) as an example, the work platform 4 is formed with a suction path 41. In a set state in which the pseudo tooth base 10 is placed on the work base 4, the suction path 41 of the work base 4 and the suction holes 13 (two in this case) of the pseudo tooth base 10 are configured to communicate with each other.
Then, when the main body surface W3 of the prosthetic material block WB is cut out by the prosthetic material processing apparatus 1, for example, as shown in FIG. 2 (e), the artificial tooth base 10 is covered with the prosthetic material block WB ( In this state, the vacuum mechanism 6 is operated and vacuum air is applied to the suction path 41 and the suction hole 13 to firmly hold the prosthetic material block WB by suction.

Incidentally, in order to generate vacuum air in the suction passage 41 and the suction hole 13, for example, a vacuum pump can be connected to the tip of the suction passage 41, and the suction passage 41 and the suction hole 13 can be directly evacuated. It is. In addition, an ejector (ejector pump) is connected to the distal end portion of the suction path 41, and a suction action is generated in the suction path 41 and the suction path 13 by sending compressed air to the ejector pump. It is also possible to suck and hold the block WB.
In addition, it is preferable that the workpiece mount 4 is configured so that the installation position can be changed on the surface plate 5. Specifically, when a hole for attaching to the surface plate 5 is opened in the work base 4, the hole is formed in a long hole shape, or a groove for fixing the work base 4 to the surface plate 5 is defined. In the case of forming on the board 5, it is conceivable to form this groove in the shape of a long groove, etc., so that the prosthetic material block WB as a workpiece can be adsorbed and held at an arbitrary position. It becomes easy to process.

(10) Installation of the prosthetic material block on the pseudo tooth base Hereinafter, a processing mode of cutting the main body surface W3 of the prosthetic material block WB using such a prosthetic material processing apparatus 1 will be described.
First, the pseudo tooth base 10 on which the prosthesis installation part 12 is formed is installed on the work platform 4 of the prosthesis processing apparatus 1. For this purpose, as shown in FIG. 2 (e), the pseudo tooth base 10 is attached to the work base 4 so that the prosthesis placement unit 12 faces upward.
Then, it installs so that the prosthetic material block WB formed to the junction W2 may be put on the pseudo tooth base 10. At this time, the joint portion W2 of the prosthetic material block WB is placed on the prosthesis placement portion 12 of the pseudo tooth base 10 so as to face each other. Here, as described above, the joint portion W2 (concave shape) of the prosthetic material block WB is formed so as to coincide with the prosthesis placement portion 12 (convex shape) of the pseudo tooth base 10, and thus the prosthesis. The material block WB comes into close contact with the pseudo tooth base 10, and a stable installation state is obtained.
Then, vacuum air is made to act on the suction hole 13 of the pseudo tooth base 10 through the suction path 41 of the work gantry 4, whereby the prosthetic material block WB is firmly and securely held.

(11) Processing of prosthesis (main body surface other than the joint portion) When the prosthesis material block WB is indirectly sucked and held on the work base 4 in this way, as shown in FIG. The main body surface W3 is three-dimensionally cut by the cutting blade 7 and cut into a desired prosthetic shape (tooth shape).
Further, since the present invention cuts the prosthesis W from the prosthesis material block WB that does not have the stay S or the support base D, it is not necessary to leave the runner portion R as in the prior art when the prosthesis W is processed (secured) The prosthesis W can be completed, and operations such as excision of the runner portion R and smooth polishing of the excision scar are not required. Furthermore, in the present invention, since it is not necessary to fold and modify the runner portion R, an extremely hard material such as zirconia can be applied as the prosthetic material block WB.

  In addition, the fixing device 2 that fixes the pseudo base block 10B when the pseudo tooth base 10 is processed and the fixing device 3 that fixes the prosthetic material block WB when the prosthesis is processed (when the joint portion W2 is processed) are also used. However, it is possible to use both the fixing devices 2 and 3 and the prosthesis processing device 1 including the vacuum mechanism 6. In other words, in this case, the prosthesis processing apparatus 1 having the vacuum mechanism 6 can also serve as the fixing devices 2 and 3, and it is not necessary to prepare a number of equipment with similar functions. In addition, when performing these processes with one equipment (prosthesis processing apparatus 1), it is possible to use this apparatus without acting vacuum air except when forming the main body surface W3 of the prosthesis W. Yes (may be used).

Further, the pseudo tooth base 10 obtained by the above-mentioned “processing of the pseudo tooth base” can also be used as a dental model (abutment model). That is, normally, the finished prosthesis W is delivered to the dentist in a set state on the dental model (abutment model), so the pseudo tooth base 10 is used as the pseudo tooth base (dental model). Is something that can be done.
In the above description, the crown is mainly described as the prosthesis W, but as the other prosthesis W, a bridge, an inlay, an onlay, and the like can be formed by the same method.

1 Prosthesis Processing Device 2 Fixing Device (Pseudo Base Block Fixing Device)
3 Fixing device (Prosthetic material block fixing device)
4 Work frame 5 Surface plate 6 Vacuum mechanism 7 Cutting blade 10 Pseudo tooth platform

2 Fixing device (pseudo base block fixing device)
21 Clamp 22 Cutting blade

3 Fixing device (Prosthetic material block fixing device)
31 Clamp 32 Cutting blade

4 Work frame 41 Suction path

10 pseudo tooth base 10B pseudo base block 11 seating surface 12 prosthesis installation part (top)
13 Suction hole

W prosthesis WB prosthesis material block W1 seat surface W2 joint W3 body surface

C 3D optical camera T Abutment tooth P Patient (treated)
M Automatic cutting machine (Milling machine)
S Stay D Support base R Runner part

Claims (4)

A method of processing a dental prosthesis by three-dimensionally cutting a hard prosthesis material block,
This method
Creating a pseudo tooth base that reproduces the base of the tooth to be treated with a model (pseudo tooth base processing step);
<Joint processing step of prosthesis> to form a joint part to be joined in close contact with the top of the created pseudo tooth base in a prosthesis material block;
Forming the main body surface other than the joint portion in the prosthetic material block, comprising <main body surface processing step of the prosthesis>
In the <pseudo tooth base processing step>, after obtaining the tooth type data of the patient as three-dimensional data, based on this data, a pseudo tooth base that reproduces the top shape of the base portion is created, and the pseudo tooth base is created. It forms a suction hole that communicates with the other outer surface from the top,
In the <prosthetic joint processing step>, the concave and convex relationship of the top three-dimensional data in the pseudo tooth base is reversed, and the joint is cut into the prosthetic material block,
In the <prosthesis main body surface processing step>, the prosthesis material block on which the joint portion is formed is installed so as to be in close contact with the top of the pseudo tooth base, and vacuum air is applied to the suction hole of the pseudo tooth base. A prosthesis processing method, wherein the body surface of the prosthesis material block is three-dimensionally cut in a state where the prosthesis material block is held on the pseudo tooth base to obtain a desired prosthesis shape.
2. The prosthesis according to claim 1, wherein the pseudo tooth base is created in the <pseudo tooth base machining step> by cutting from a hard pseudo base block having a certain size by cutting. Processing method.
A cutting blade that is supported by a spindle and rotates;
A work stand for holding the work,
A device that holds a hard prosthetic material block on a work base, three-dimensionally processes the prosthetic material block into a desired three-dimensional shape based on appropriate cutting data, and processes a dental prosthesis,
In holding the prosthetic material block on the work cradle, the prosthetic material block is held via a pseudo tooth base having a top shape to be a base of the tooth to be treated,
In addition, the pseudo tooth base is formed with a suction hole that communicates with the other outer surface of the pseudo base block from the apex where the prosthesis material block is in close contact. A prosthesis processing apparatus, wherein the prosthesis material block is attached to the gantry and vacuum air is applied to the suction holes of the quasi-tooth platform so that the pseudo-tooth block attached to the workpiece gantry is sucked and held.
  The prosthesis processing apparatus according to claim 3, wherein the work platform is installed on a surface plate of a prosthesis processing apparatus, and is configured so that an installation position thereof can be appropriately changed.

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