JP3230323U - Ceramic body for dental prosthesis - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate confirmation and positioning of a ceramic body for dental prosthesis with respect to a holder of a CAD / CAM processing apparatus in a peripheral direction, and to accurately position the ceramic body with respect to the holder during cutting. Provide a ceramic body. SOLUTION: A ceramic body 1 for dental prosthesis is made of a ceramic material, is formed into a circular planar shape and a disk-shaped outer shape, has a diameter D1 of 50 mm or more, and has at least a peripheral edge of a circular portion having the diameter D1. The convex part 4 is partially attached. Further, a recess 3a for interrupting the convex component 4 in the peripheral direction is formed, and at least one recess 3a is formed, and the formed recess 3a is a mark indicating the direction of the outer shape. [Selection diagram] Fig. 1

Description

The present invention relates to a ceramic body for dental prosthesis.

As a material used for restoration of a tooth partially defective due to tooth decay or the like, a composite material called a composite resin composed of an inorganic substance and an organic substance, or a metal or ceramics is used. In particular, ceramics not only have excellent wear resistance, but also have excellent aesthetics because they can reproduce a color tone close to that of natural teeth, and are used as materials for dental prostheses such as crowns and bridges.

Conventionally, dental prostheses to be worn in the oral cavity have been composed by coating the surface of a metal frame with ceramics adjusted to the color tone of natural teeth, but the entire prosthesis is made of ceramics. Ceramic prostheses are also being used. The all-ceramic prosthesis is, for example, a product in which an exterior portion (that is, a ceramic layer) is formed of glass porcelain on the surface of a frame made of a ceramic sintered body instead of a conventional metal frame.

Since the entire prosthesis is made of ceramics, the all-ceramic prosthesis is originally a natural tooth caused by metal allergies caused by metal contact with the living body and an opaque underlying layer provided to hide the metal color. Various problems such as aesthetics, such as the inability to obtain the color tone of the above, can be suppressed or solved.

Since the dental prosthesis is required to have extremely high dimensional accuracy in terms of meshing and the like, the dental prosthesis is manufactured by a dental CAD / CAM processing device. By using a dental CAD / CAM processing device, it is possible to design the shape of a dental prosthesis on the screen using a computer, and a dental prosthesis designed by automatic cutting of a ceramic block body. It is possible to produce a desired dental prosthesis by cutting into the shape of an object. Therefore, a large number of high-quality ceramic dental prostheses can be produced in a short time.

The manufacturing method using this dental CAD / CAM processing device can be roughly classified into the following three methods. The first method is a method of cutting a ceramic sintered body. The second method is a method in which an unsintered ceramic molded body is cut and then the cut ceramic molded body is sintered. The third method is a method in which a temporarily sintered ceramic body is cut and then sintered.

The first method is a method of cutting a ceramics sintered body that has been sintered or hot isostatic press (HIP) treated at about 1300 to 1600 ° C., and the dimensions of the ceramics body after the cutting process. There is no change. Therefore, it is possible to manufacture a dental prosthesis with high dimensional accuracy according to the accuracy of the measuring machine of the CAD / CAM processing device and the processing machine. On the other hand, since the hardness of the ceramic sintered body is high, there is a problem that the cutting time is long, the life of a tool such as a drill is short, and the manufacturing cost is high.

The second method is a method in which a ceramic molded product is cut in consideration of the shrinkage rate at the time of sintering, and then sintered at 1300 to 1600 ° C. Since a constant shrinkage rate can be obtained by controlling the molding conditions and density of the ceramic molded product, it is possible to manufacture a dental prosthesis with high dimensional accuracy as in the first method. On the other hand, since it includes a degreasing step, there is a problem that sintering takes a long time of, for example, 10 hours.

On the other hand, the third method is a method in which the shrinkage rate of the main sintering is calculated from the shrinkage rate at the time of temporary sintering, the ceramic body is cut in consideration of this, and then the sintering is performed at 1300 to 1600 ° C. Is. Since the temporarily sintered ceramic body has a lower hardness than the ceramic sintered body subjected to the main sintering, it is possible to shorten the cutting time and have an advantage that the life of the tool is extended. Further, since degreasing is completed by temporary sintering, there is an advantage that the main sintering time after cutting is shortened. Therefore, most dental prostheses made of ceramics are made by the third method.

Further, the planar shape of the temporarily sintered ceramic body is formed into a circular shape, and a convex portion is provided on the entire circumference, and the convex portion is engaged from above and below by a holder of a CAD / CAM processing device to hold the ceramic body. The method and the ceramic body are disclosed (see, for example, Patent Document 1).

Japanese Patent No. 5698096

However, the external shape of the temporary sintered body of Patent Document 1 has a circular planar shape and is provided with convex portions all around, so that the same external shape can be obtained in the peripheral direction and the vertical direction (front and back directions). It will appear.

When a part of the ceramic body is cut with a CAD / CAM processing device and then cut again with a CAD / CAM processing device, a part of the dental prosthesis from the previous cutting process is formed on the ceramic body. Therefore, confirmation of the peripheral direction and accuracy of positioning are more important. However, since the same appearance shape appears in the peripheral direction of the ceramic body of Patent Document 1, it is difficult to accurately position the ceramic body with respect to the holder.

The present invention has been made in view of the above problems, and it is easy to confirm and position the peripheral direction of the ceramic body for dental prosthesis with respect to the holder of the CAD / CAM processing apparatus, and to the holder during cutting. Provided is a ceramic body for dental prosthesis that can be accurately positioned.

The above problem is solved by the following invention. That is, the ceramic body for dental prosthesis of the present invention is made of a ceramic material, is formed into a circular planar shape and a disk-shaped outer shape, has a diameter of 50 mm or more, and has at least a part of the peripheral edge of the circular portion having the diameter. A convex part is attached to the surface, and a concave portion is formed to interrupt the convex part in the peripheral direction, and at least one concave portion is formed, and the formed concave portion is a mark indicating the direction of the outer shape. It is characterized by.

Further, in one embodiment of the ceramic body for dental prosthesis of the present invention, it is preferable that at least one other recess is formed at a position of 180 ° in the peripheral direction when viewed from the plane direction.

Further, in another embodiment of the ceramic body for dental prosthesis of the present invention, at least two other recesses are formed at a position of less than 180 ° in the peripheral direction when viewed from the plane direction, and the recesses are formed. It is preferable that at least two other recesses are formed except for line-symmetrical points with respect to the imaginary line passing through the center and the center having a diameter of 50 mm or more.

Further, in another embodiment of the ceramic body for dental prosthesis of the present invention, it is preferable that the convex part is made of resin.

Further, in another embodiment of the ceramic body for dental prosthesis of the present invention, it is preferable that the convex part is magnetic.

Further, another embodiment of the ceramic body for dental prosthesis of the present invention preferably includes a membranous magnet on at least the surface of the convex part.

According to the ceramic body for dental prosthesis according to the present invention, it is easy to confirm and position the peripheral direction of the ceramic body for dental prosthesis with respect to the holder of the CAD / CAM processing device, and it is accurate with respect to the holder during cutting. It is possible to position the ceramic body for dental prosthesis.

It is a perspective view of the ceramic body for dental prosthesis which concerns on embodiment of this invention. (A) is a plan view of the ceramic body for dental prosthesis of FIG. 1 as viewed from the direction of arrow P. (B) is a side view of the ceramic body for dental prosthesis of FIG. 1 as viewed from the direction of arrow S. It is a top view which shows the 1st modification of the ceramic body for dental prosthesis which concerns on embodiment. It is a top view which shows the 2nd modification example of the ceramic body for dental prosthesis which concerns on embodiment.

The first feature of the present embodiment is that it is made of a ceramic material, is formed into a circular planar shape and a disk-shaped outer shape, has a diameter of 50 mm or more, and is at least a part of the peripheral edge of the circular portion having the diameter. A convex part is attached to the dentistry, and a concave portion that interrupts the convex part in the peripheral direction is formed, and at least one concave portion is formed, and the formed concave portion is a mark indicating the direction of the outer shape. It was a ceramic body for prosthesis.

According to this configuration, it becomes easy to confirm and position the peripheral direction of the ceramic body for dental prosthesis with respect to the holder of the CAD / CAM processing device, and the ceramic body for dental prosthesis can be accurately mounted on the holder during cutting. It is possible to position.

In the present invention, the circular planar shape includes not only a perfect circular planar shape but also a planar shape having a roundness of 1 mm or less.

Further, in the present invention, the disk-shaped outer shape refers to an outer shape in which one side and the other side are both flat and have a desired thickness.

Further, in the present invention, the ceramic body for dental prosthesis refers to a consolidated body made of ceramics having a disk-shaped outer shape and manufactured by temporary sintering. Further, the temporary sintering refers to a step of producing a consolidated body (consolidated body made of ceramics) from a ceramic material, and includes semi-sintering, which is commonly used, and temporary firing or semi-baking.

Further, in the present invention, the convex part is attached to the ceramic body for dental prosthesis as a separate part, and when the ceramic body for dental prosthesis is viewed from the side surface after the attachment, it extends over the peripheral direction of the ceramic body for dental prosthesis. It is a part that protrudes in a convex shape. Moreover, it refers to the one attached to at least a part of the peripheral edge of the ceramic body for dental prosthesis.

Further, in the present invention, the concave portion refers to a portion formed by being recessed in a concave shape when the dental prosthetic ceramic body is viewed from a plane direction, and the convex part is interrupted in the peripheral direction of the dental prosthetic ceramic body.

The second feature is that at least one other recess is formed at a position of 180 ° in the peripheral direction when viewed from the plane direction.

According to this configuration, it becomes easy to confirm and position the peripheral direction of the ceramic body for dental prosthesis with respect to the holder of the CAD / CAM processing device, and the ceramic body for dental prosthesis can be accurately mounted on the holder during cutting. It is possible to position. Further, each convex part can be formed into an arc shape of 180 °. Therefore, since each convex part can be attached to the peripheral edge of the circular portion from the side surface direction of the circular portion of the ceramic body for dental prosthesis, the attachment work of the convex part is further simplified.

The third feature is that at least two other recesses are formed at locations less than 180 ° in the peripheral direction when viewed from the plane direction, and the center of the recess and the center with a diameter of 50 mm or more are formed. It is assumed that at least two other recesses are formed with respect to the passing virtual line except for the line-symmetrical part.

According to this configuration, it becomes easy to confirm and position the peripheral direction of the dental prosthesis ceramic body with respect to the holder of the CAD / CAM processing device, and the dental prosthesis ceramic body can be accurately mounted on the holder during cutting. It becomes possible to position. Further, it becomes easy to confirm and position the ceramic body for dental prosthesis in the vertical direction with respect to the holder.

Further, each convex part can be formed into an arc shape of less than 180 °. Therefore, since each convex part can be attached to the peripheral edge of the circular portion from the side surface direction of the circular portion of the ceramic body for dental prosthesis, the attachment work of the convex part is further simplified.

The fourth feature is that the convex parts are made of non-ceramic material.

The fifth feature is that the convex parts are made of resin.

According to these configurations, when the ceramic body for dental prosthesis is attached to the holder, it is possible to prevent the convex parts from being chipped due to contact. Further, by forming the convex parts with resin, the weight of the convex parts can be reduced.

The sixth feature is that the convex parts are magnetic.

The seventh feature is that a film magnet is provided on at least the surface of the convex part that is not in contact with the outer shape of the ceramic body for dental prosthesis.

According to these configurations, when the holder is made of a material such as metal that generates an attractive force against a magnetic force, the ceramic body for dental prosthesis is temporarily fixed to the holder by the attractive force. Can be done. Therefore, it becomes possible to position the ceramic body for dental prosthesis with respect to the holder more quickly.

In particular, by forming a film-like magnet on the surface of the convex part, it is possible to quickly realize a ceramic body for dental prosthesis in which the convex part is magnetized at low cost.

Hereinafter, the ceramic body 1 for dental prosthesis and the manufacturing method thereof according to the embodiment of the present invention will be described with reference to FIGS. 1 and 2 as appropriate. The ceramic body 1 for dental prosthesis according to the present embodiment is formed into a disk-shaped outer shape as shown in FIG. 1, and the planar shape seen from the planar direction is circular as shown in FIG. 2 (a). Is. The disk-shaped outer shape refers to an outer shape in which one side and the other side are both flat and have a desired thickness T. Further, the circular planar shape includes not only a perfect circular planar shape but also a planar shape having a roundness of 1 mm or less.

The ceramic body 1 for dental prosthesis refers to a consolidated body made of ceramics produced by temporary sintering, which is used as a block body to be cut for producing a dental prosthesis by cutting. Further, the temporary sintering refers to a step of producing a consolidated body (consolidated body made of ceramics) from a ceramic material, and includes semi-sintering, temporary firing, or semi-baking that are commonly used.

The ceramic material forming the dental prosthesis ceramic body 1 is any of silica, alumina, zirconia, hydroxyapatite, and β-tricalcium phosphate (β-TCP). This ceramic material may be prepared as powder or the like.

The diameter D1 on one side 2a and the other side 2b is preferably 50 mm or more. The reason is that 50 mm or more is required to form 14 human dentitions from the dental prosthetic ceramic body 1.

The upper limit of the diameter D1 is not particularly limited, but is preferably 100 mm or less from the viewpoint of the allowable holding range of the holder provided in the dental CAD / CAM processing device.

The thickness T of the dental prosthetic ceramic body 1 can be arbitrarily set, but from the viewpoint of the allowable holding range of the holder of the CAD / CAM processing apparatus, it is preferably 10 mm or more and 30 mm or less.

Further, in the dental prosthetic ceramic body 1, the convex component 4 is attached to at least a part of the peripheral edge of the circular portion having the diameter D1. Further, a recess 3a is formed in which the convex part 4 is interrupted in the peripheral direction of the dental prosthetic ceramic body 1. At least one recess 3a is formed, and in the embodiment of FIGS. 1 to 2, the recess 3a is formed parallel to the thickness T direction. The roundness of the virtual line when the outer periphery of the entire convex component 4 attached discontinuously is continuously connected is also set to 1 mm or less.

In the present invention, the convex part 4 is attached to the ceramic body for dental prosthesis as a separate part, and when the ceramic body 1 for dental prosthesis is viewed from the side surface after the attachment, the peripheral direction of the ceramic body 1 for dental prosthesis It is a part that protrudes in a convex shape. Moreover, it refers to the one attached to at least a part of the peripheral edge of the dental prosthetic ceramic body 1. Further, the convex component 4 is attached so as to project from the peripheral edges of the one side 2a and the other side 2b by about 2.0 to 2.25 mm. The thickness T4 of the convex part can be set arbitrarily, but it is preferably about 10 mm from the viewpoint of the allowable holding range of the holder of the CAD / CAM processing apparatus.

By attaching the convex component 4 to the peripheral edge of the dental prosthesis ceramic body 1, the peripheral edge of the dental prosthesis ceramic body 1 is protected by the convex component 4. Therefore, when the dental prosthesis ceramic body 1 is attached to the holder of the CAD / CAM processing device, the contact between the dental prosthesis ceramic body 1 and the holder is prevented. Therefore, it is possible to prevent the ceramic body 1 for dental prosthesis from being chipped.

The convex part 4 is made of a non-ceramic material. In particular, it is preferable to form the convex component 4 with a resin (among them, a plastic which is a thermoplastic resin). By forming the convex part 4 with a non-ceramic material such as resin (particularly plastic), it is possible to prevent the convex part 4 from being chipped due to contact when the dental prosthetic ceramic body 1 is attached to the holder. The weight of the convex component 4 can also be reduced.

In the present invention, the concave portion 3a is a portion formed by being recessed in a concave shape when the dental prosthetic ceramic body 1 is viewed from a plane direction, and the convex part 4 is interrupted in the peripheral direction of the dental prosthetic ceramic body 1. Point to. In the present embodiment, the recess 3a serves as a mark indicating the direction of the outer shape of the dental prosthetic ceramic body 1.

By forming the recess 3a, the recess 3a serves as a mark indicating the direction of the outer shape, so that it is possible to prevent the same appearance shape from appearing in the peripheral direction of the dental prosthetic ceramic body 1. When a part of the ceramic body 1 for dental prosthesis is cut with a CAD / CAM processing device and then cut again with a CAD / CAM processing device, a part of the dental prosthesis at the time of the previous cutting process is used. Since it is formed on the ceramic body 1 for dental prosthesis, the accuracy of confirmation and positioning in the peripheral direction becomes more important.

Even in such a usage situation, in the dental prosthesis ceramic body 1 according to the present invention, since the recess 3a serves as a mark indicating the direction of the outer shape, it is possible to prevent the same appearance shape from appearing in the peripheral direction thereof. Therefore, the peripheral direction of the dental prosthesis ceramic body 1 can be easily confirmed and positioned with respect to the holder, and the dental prosthesis ceramic body 1 can be accurately positioned with respect to the holder during cutting.

Since it is sufficient that the above effect can be obtained by forming the recess 3a, the width dimension of the recess 3a may be formed to the extent that it can be visually recognized.

Next, a method for manufacturing the ceramic body 1 for dental prosthesis will be described. First, the ceramic material as described above is prepared and the ceramic material is molded to form a disk-shaped outer shape such as the ceramic body 1 for dental prosthesis. Molding shall be press molding or molding by a machine tool. Examples of machine tools include milling lathes and machining centers.

Next, the molded ceramic material is temporarily sintered at -700 ° C or higher and -100 ° C or lower from the sintering temperature at which the theoretical density can be obtained to obtain a dental prosthesis ceramic body 1 composed of a porous body having a plurality of gaps. prepare.

The sintering temperature at which the theoretical density can be obtained refers to the sintering temperature at which the ceramic sintered body made of a desired ceramic material can obtain the theoretical density. Specifically, the theoretical densities of silica 2.20 g / cm ³ , alumina 3.99 g / cm ³ , zirconia 6.07 g / cm ³ , hydroxyapatite 3.16 g / cm ³ , and β-TCP 3.07 g / cm ³ Refers to the sintering temperature when the obtained ceramic sintered body is formed. From this sintering temperature, sintering is performed at -700 ° C or higher and -100 ° C or lower.

An example of the sintering temperature of each ceramic sintered body from which the theoretical density can be obtained is as follows. Silica 1400 ℃, Alumina 1550 ℃, Zirconia 1450 ℃, Hydroxyapatite 1300 ℃, β-TCP 1300 ℃.

The temporary sintering temperature of the ceramic body 1 for dental prosthesis of the porous body depends on the type and particle size of the ceramic material, but it is desirable that the temperature is equal to or lower than the temperature at which the pores of the porous body are not closed even if the temporary sintering progresses, and as a specific numerical range. It is desirable to tentatively sinter at 850 ° C or higher and 1050 ° C or lower. The atmosphere for temporary sintering may be air or a non-oxidizing atmosphere such as a rare gas such as nitrogen or argon.

As a method for producing the porous body, the powder of the ceramic material may be molded and temporarily sintered as described above, or the powder of the ceramic material may be molded by adding an organic binder or an inorganic binder and temporarily sintered.

On the other hand, when the convex part 4 is manufactured of a non-ceramic material (particularly plastic), injection molding or the like is used.

Next, the concave portion 3a is formed by attaching the convex component 4 to the peripheral edge of the porous dental prosthesis ceramic body 1. When the convex part 4 is formed in an arc shape exceeding 180 °, the convex part 4 is fitted into the peripheral edge of the circular portion of the dental prosthetic ceramic body 1, and the convex component 4 is fitted to at least a part of the peripheral edge of the circular portion by an adhesive or the like. Install 4.

The ceramic body 1 for dental prosthesis according to this embodiment can be variously changed. For example, as a first modification, in addition to forming one recess 3a in advance as shown in FIG. 3, when the dental prosthetic ceramic body 1 is viewed from a plane direction, the dental prosthetic ceramic body 1 At least another other recess 3b may be formed at 180 ° over the peripheral direction.

From FIG. 3, the alternate long and short dash line CL is shown so as to pass through the center of the recess 3a and the center on one side 2a. Therefore, with the recess 3a as a reference, the location 180 ° through the center on one side 2a is the location on the alternate long and short dash line CL. In the first modification, two recesses 3a and 3b are formed on the alternate long and short dash line CL.

In this way, at least one other concave portion 3b is formed at a position 180 ° with respect to the one concave portion 3a, so that in addition to the confirmation and positioning in the peripheral direction, each convex component 4 can be formed. It is possible to form a 180 ° arc shape. Therefore, each convex part 4 is attached to the peripheral edge of the circular portion with an adhesive or the like from the side surface direction of the circular portion of the dental prosthetic ceramic body 1, and the convex component 4 is attached to at least a part of the peripheral edge of the circular portion. Can be done. Therefore, the mounting work of the convex component 4 is further simplified as compared with the case where the convex component 4 is formed in an arc shape exceeding 180 °.

Further, for example, as shown in FIG. 4 as a second modification, in addition to forming one recess 3a in advance, when the dental prosthesis ceramic body 1 is viewed from a plane direction, the dental prosthesis ceramic body 1 is formed. Examples thereof include a form in which at least two other recesses 3b and 3c are formed at a position of less than 180 ° over the peripheral edge direction of 1. Further, at least two other recesses 3b and 3c are axisymmetric with respect to a virtual line passing through the center of the recess 3a and the center of diameter D1 (ie, the alternate long and short dash line CL passing through the center of the recess 3a and the center on one side 2a). It is formed except for the parts.

When the dental prosthesis ceramic body 1 is turned upside down with the virtual line (single point chain line CL) as the central axis, the two recesses 3b and 3c do not appear line-symmetrically, so the overall shape of the dental prosthesis ceramic body 1 is turned upside down. Does not appear in the same shape.

Therefore, the appearance shape of the dental prosthesis ceramic body 1 in the vertical direction does not appear the same. Therefore, in addition to the confirmation and positioning of the peripheral direction, it becomes easy to confirm and position the ceramic body 1 for dental prosthesis in the vertical direction with respect to the holder of the CAD / CAM processing device, and the dental prosthesis with respect to the holder during cutting. It is possible to accurately position the ceramic body 1 in the vertical direction as well. Further, by making the shapes of the recesses 3a to 3c different from each other when viewed from the plane direction, it is possible to more reliably confirm the vertical direction of the dental prosthesis ceramic body 1.

Further, each convex component 4 can be formed into an arc shape of less than 180 °. Therefore, even in the second modification, each convex part 4 is attached to the peripheral edge of the circular portion with an adhesive or the like from the side surface direction of the circular portion of the dental prosthetic ceramic body 1, and at least a part of the peripheral edge of the circular portion. The convex component 4 can be attached to the. Therefore, the mounting work of the convex component 4 is further simplified as compared with the case where the convex component 4 is formed in an arc shape exceeding 180 °.

The number of recesses formed can be set arbitrarily. Therefore, as shown in FIGS. 1 to 4, the number is not limited to 3 or less, and 4 or more may be provided. However, when the center positions of each recess are provided at equal intervals (for example, when three recesses are provided at equal intervals of 120 °), the shape of each recess when viewed from the plane is different, which is a dental prosthesis. It is desirable from the viewpoint of confirming the peripheral direction and the vertical direction of the ceramic body 1 for use.

Alternatively, the recess 3a may be formed obliquely with respect to the thickness T direction.

Alternatively, the width of the recess 3a may be different between the one side 2a side and the other side 2b side. With such a configuration, the appearance shape of the dental prosthesis ceramic body 1 in the vertical direction is not the same due to the difference in the width dimension of each of the recesses 3a on the one side 2a side and the other side 2b side. Therefore, in addition to the confirmation and positioning of the peripheral direction, it becomes easy to confirm and position the ceramic body 1 for dental prosthesis in the vertical direction with respect to the holder of the CAD / CAM processing device, and the dental prosthesis with respect to the holder during cutting. It is possible to accurately position the ceramic body 1 in the vertical direction as well.

Alternatively, the convex component 4 may be changed to an embodiment in which the convex component 4 is magnetized. As such an embodiment, the entire or a part of the convex component 4 may be formed of a magnet. In this case, a magnet having an outer shape of the convex component 4 may be formed by press molding or the like. Alternatively, the surface of the magnet may be covered with a resin to form the convex component 4.

Alternatively, the convex component 4 may be formed of resin, and a plurality of block-shaped magnets may be attached to the surface of the convex component 4 that is not in contact with at least the outer shape of the dental prosthetic ceramic body 1.

Alternatively, a film-like magnet may be provided on at least the surface of the convex component 4 that is not in contact with the outer shape of the dental prosthetic ceramic body 1.

When the convex part 4 is magnetic as described above, and the holder of the CAD / CAM processing device is made of a material that generates an attractive force with respect to a magnetic force, such as metal, the suction is attracted. The dental prosthesis ceramic body 1 can be temporarily fixed to the holder by force. Therefore, it is possible to position the dental prosthetic ceramic body 1 with respect to the holder more quickly.

In particular, by forming the film-like magnet on the surface of the convex component 4, it is possible to quickly realize an embodiment in which the convex component 4 is magnetized at low cost.

As the film-like magnet, an R-Fe-B based alloy having a thickness of about 0.2 μm to 400 μm may be formed. R is a rare earth element, mainly Ni. In addition, various physical film forming methods such as plating deposited from the liquid, coating by applying or spraying fine alloy powder particles, CVD, vapor deposition, sputtering, ion plating, laser deposition, laser ablation, etc. A method of forming a film by Further, heat treatment is performed after the film formation.

When a film-like magnet is formed on the surface of the convex component 4, it is necessary to perform heat treatment, and it is desirable to select a refractory metal such as Fe, Mo, or Ti as the constituent material of the convex component 4. , It may be manufactured by an existing molding method such as press molding or metal powder injection molding.

1 Ceramic body for dental prosthesis
2a one side
2b other side
3a, 3b, 3c concave part 4 convex part
D1 Diameter T Thickness of ceramic body for dental prosthesis
Thickness of T4 convex parts
CL alternate long and short dash line

Claims (7)

Made of ceramic material, it has a circular flat shape and a disk-shaped outer shape, and has a diameter of 50 mm or more.
Convex parts are attached to at least a part of the periphery of the circular part having that diameter
A recess is formed to interrupt the convex part in the peripheral direction, and at least one recess is formed.
A ceramic body for dental prosthesis in which the formed recess is a mark indicating the direction of the outer shape. The ceramic body for dental prosthesis according to claim 1, wherein at least one other concave portion is formed at a position of 180 ° over the peripheral direction when viewed from a plane direction. When viewed from the plane direction, at least two other recesses are formed at a position of less than 180 ° over the peripheral direction, and at least with respect to a virtual line passing through the center of the recess and the center of the diameter. The ceramic body for dental prosthesis according to claim 1, wherein two other recesses are formed except for a line-symmetrical portion. The ceramic body for dental prosthesis according to any one of claims 1 to 3, wherein the convex part is made of a non-ceramic material. The ceramic body for dental prosthesis according to claim 4, wherein the convex part is made of resin. The ceramic body for dental prosthesis according to claim 4, wherein the convex part is magnetic. The ceramic body for dental prosthesis according to claim 6, wherein a film-like magnet is provided on at least a surface of the convex part that is not in contact with the outer shape of the ceramic body for dental prosthesis.

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