JP3229333U - 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 the 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 formed into a disk-shaped outer shape with a circular planar shape, has a diameter D1 of 50 mm or more, and is located at a position other than the center on one side 2a when viewed from the planar direction. A mark indicating the direction of the outer shape is provided. Further, a convex portion 4 is formed on at least a part of the peripheral edge of the circular portion having a diameter of 50 mm or more, a concave portion 3a for interrupting the convex portion in the peripheral edge direction is formed, and at least one concave portion is formed. , The formed recess 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, a dental prosthesis to be worn in the oral cavity has 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 base 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 ceramic sintered body that has been sintered or hot isostatic pressed (HIP) processed at about 1300 to 1600 ° C., and the dimensions of the ceramic body after cutting. 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 tools such as drills 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 to calculate the shrinkage rate of the main sintering from the shrinkage rate at the time of temporary sintering, cut the ceramic body in consideration of this, and then perform sintering 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 plane shape of the temporarily sintered ceramic body is formed into a circle, 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 problem is solved by the following invention. That is, the ceramic body for dental prosthesis of the present invention is formed into a disk-shaped outer shape with a circular planar shape, has a diameter of 50 mm or more, and has an outer shape at a portion excluding the center on one surface when viewed from the plane direction. It is characterized in that a mark indicating the direction of is provided.

Further, in one embodiment of the ceramic body for dental prosthesis of the present invention, a convex portion is formed on at least a part of the peripheral edge of a circular portion having a diameter of 50 mm or more, and a concave portion is formed so as to interrupt the convex portion in the peripheral edge direction. At the same time, it is preferable that at least one recess is formed, and the formed recess is a mark indicating the direction of the outer shape.

Further, in another embodiment of the ceramic body for dental prosthesis of the present invention, it is preferable that the shape of the concave portion when viewed from the plane direction and the shape of the concave portion when viewed from the other surface direction are different.

Further, in another 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 less than 180 ° in the peripheral direction when viewed from the plane direction.

Further, in one embodiment of the ceramic body for dental prosthesis of the present invention, a convex portion is formed on at least a part of the peripheral edge of a circular portion having a diameter of 50 mm or more, and a D-cut surface in contact with the peripheral edge of the circular portion is formed. At least one D-cut surface is formed at the same time, and it is preferable that the D-cut surface is a mark indicating the direction of the outer shape.

Further, in another embodiment of the ceramic body for dental prosthesis of the present invention, at least one other D-cut surface is formed at a position less than 180 ° in the peripheral direction when viewed from the plane direction. preferable.

Further, in one embodiment of the ceramic body for dental prosthesis of the present invention, a convex portion is formed on at least a part of the peripheral edge of a circular portion having a diameter of 50 mm or more, and at least one side or the other side of a disk-shaped outer shape is formed. The protrusion is provided on the same plane as the flat surface of the above, the protrusion amount of the protrusion is equal to or more than the protrusion amount of the convex portion, at least one protrusion is formed, and the protrusion is a mark indicating the direction of the outer shape. It is preferable to have.

Further, in another embodiment of the ceramic body for dental prosthesis of the present invention, it is preferable that the shape of the protruding portion when viewed from the plane direction and the shape of the protruding portion when viewed from the other surface direction are different.

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

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 1st 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 partially enlarged view of the circle A of FIG. 2 (a). (A) It is a top view which shows the 1st modification example of the ceramic body for dental prosthesis which concerns on 1st Embodiment. (B) It is a partially enlarged view of the circle B of FIG. 4 (a). It is a partially enlarged view which shows the modification example of FIG. 4 (b). (A) It is a perspective view which shows the 2nd modification example of the ceramic body for dental prosthesis which concerns on 1st Embodiment. (B) is a side view of the ceramic body for dental prosthesis of FIG. 6 (a) when viewed from the direction of arrow S. It is a side view which shows the 3rd modification example of the ceramic body for dental prosthesis which concerns on 1st Embodiment. (A) It is a top view which shows the 4th modification example of the ceramic body for dental prosthesis which concerns on 1st Embodiment. (B) It is a partially enlarged view of the circle C of FIG. 8 (a). It is a side view of the ceramic body for dental prosthesis which concerns on 2nd Embodiment of this invention. (A) is a plan view of the ceramic body for dental prosthesis of FIG. 9 as viewed from the direction of arrow U. (B) It is a partially enlarged view of the circle D of FIG. 10 (a). (A) is a plan view of the ceramic body for dental prosthesis of FIG. 9 as viewed from the direction of arrow D. (B) It is a partially enlarged view of the circle E of FIG. 11 (a). It is a perspective view of the ceramic body for dental prosthesis which concerns on 3rd Embodiment of this invention. It is a top view of the ceramic body for dental prosthesis of FIG. 12 when viewed from the direction of arrow P. It is a top view which shows the modification example of the ceramic body for dental prosthesis which concerns on 3rd Embodiment. It is a perspective view of the ceramic body for dental prosthesis which concerns on 4th Embodiment of this invention. It is a top view of the ceramic body for dental prosthesis of FIG. 15 when viewed from the direction of arrow P. It is a side view of the ceramic body for dental prosthesis of FIG. 15 when viewed from the direction of arrow S. It is a perspective view of the ceramic body for dental prosthesis which concerns on 5th Embodiment of this invention. It is a top view of the ceramic body for dental prosthesis of FIG. 18 when viewed from the direction of arrow P. It is a perspective view of the ceramic body for dental prosthesis which concerns on 6th Embodiment of this invention. It is a top view of the ceramic body for dental prosthesis of FIG. 20 when viewed from the direction of arrow P. It is a side view of the ceramic body for dental prosthesis of FIG. 20 when viewed from the direction of arrow S. It is a perspective view which shows the 1st modification of the ceramic body for dental prosthesis which concerns on 6th Embodiment. It is a side view of the ceramic body for dental prosthesis of FIG. 24 when viewed from the direction of arrow S. It is a side view which shows the 2nd modification example of the ceramic body for dental prosthesis which concerns on 6th Embodiment. It is a side view of the ceramic body for dental prosthesis which concerns on 7th Embodiment of this invention. It is a top view of the ceramic body for dental prosthesis which concerns on 8th Embodiment of this invention.

The first feature of the present embodiment is that the outer shape is formed into a disk-like outer shape with a circular plane shape, has a diameter of 50 mm or more, and has an outer shape excluding the center on one side when viewed from the plane direction. It is a ceramic body for dental prosthesis provided with a mark indicating the direction of.

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 mark indicating the direction of the outer shape is a concave portion, a D-cut surface, a protruding portion, a mark written on one side by ink, a mark formed so as not to be erased such as a ruled line, etc. , Anything that can be seen is included.

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.

The second feature is that a convex portion is formed on at least a part of the peripheral edge of the circular portion having a diameter of 50 mm or more, a concave portion that interrupts the convex portion in the peripheral direction is formed, and at least one concave portion is formed. It is said that it is formed, and the formed recess is a mark indicating the direction of the outer shape.

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, the concave portion is formed so as to hang on one surface, the concave portion is formed to the point where the convex portion is interrupted, and the concave portion is formed so as to be a stop groove so that the concave portion does not extend to the other surface. It is easy to check and position the ceramic body for dental prosthesis in the vertical direction.

In the present invention, the convex portion is a portion formed so as to project convexly toward the peripheral edge of the dental prosthetic ceramic body when the dental prosthetic ceramic body is viewed from the side surface, and is dental. It refers to a material formed on at least a part of the peripheral edge of a ceramic body for prosthodontics.

Further, in the present invention, the recess refers to a portion formed by recessing the ceramic body for dental prosthesis when viewed from a plane direction.

The third feature is that the shape of the concave portion when viewed from the plane direction is different from the shape of the concave portion when viewed from the other surface direction.

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

According to these configurations, 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 accurately with respect to the holder during cutting. Can be positioned. Further, it becomes easy to confirm and position the ceramic body for dental prosthesis in the vertical direction with respect to the holder.

The fifth feature is that a convex portion is formed on at least a part of the peripheral edge of the circular portion having a diameter of 50 mm or more, a D-cut surface in contact with the peripheral edge of the circular portion is formed, and at least one D-cut surface is formed. It is said that more than one part is formed and the D-cut surface is a mark indicating the direction of the outer shape.

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.

The sixth feature is that at least one other D-cut surface is formed at a position of less than 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, it becomes easy to confirm and position the ceramic body for dental prosthesis in the vertical direction with respect to the holder.

The seventh feature is that a convex portion is formed on at least a part of the peripheral edge of the circular portion having a diameter of 50 mm or more, and the protruding portion is flush with at least one plane of one side or the other side of the disk-shaped outer shape. Is provided, the amount of protrusion of the protruding portion is equal to or greater than the amount of protrusion of the convex portion, at least one protruding portion is formed, and the protruding portion is a mark indicating the direction of the outer shape.

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, in the present invention, the protruding amount of the protruding portion is the amount of protrusion in the radial direction of the ceramic body for dental prosthesis from the peripheral edge of one side formed with a diameter of 50 mm or more.

The eighth feature is that the shape of the protruding portion when viewed from the plane direction is different from the shape of the protruding portion when viewed from the other surface direction.

The ninth feature is that at least one other protrusion is formed at a position of less than 180 ° in the peripheral direction when viewed from the plane direction.

According to these configurations, 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 accurately with respect to the holder during cutting. Can be positioned. Further, it becomes easy to confirm and position the ceramic body for dental prosthesis in the vertical direction with respect to the holder.

Hereinafter, the ceramic body 1 for dental prosthesis and the manufacturing method thereof according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 8 as appropriate. The dental prosthetic ceramic body 1 according to the first embodiment is formed into a disk-shaped outer shape as shown in FIG. 1, and the planar shape seen from the plane direction is as shown in FIG. 2 (a). It is circular. 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.

A recess 3a is formed in a part of the disk-shaped outer shape. In FIGS. 1 to 3, an embodiment in which one recess 3a is formed so as to hang on one side 2a and a part on the other side 2b is illustrated. Further, the recess 3a is formed parallel to the thickness T direction from above one surface 2a to above the other surface 2b.

The dental prosthesis ceramic body 1 refers to a solidified 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 ceramic body 1 for dental prosthesis is any one 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 portion 4 is formed on at least a part of the peripheral edge of the circular portion having the diameter D1. Further, a concave portion 3a is formed in which the convex portion 4 is interrupted in the peripheral direction of the dental prosthetic ceramic body 1. At least one recess 3a is formed. The roundness of the virtual line when the outer circumference of the entire convex portion 4 formed discontinuously is continuously connected is also set to 1 mm or less.

In the present invention, the convex portion 4 is a portion formed so as to project convexly toward the peripheral edge of the dental prosthetic ceramic body 1 when the dental prosthetic ceramic body 1 is viewed from the side surface direction. , Refers to those formed on at least a part of the peripheral edge of the dental prosthetic ceramic body 1. Further, the convex portion 4 is formed so as to project from the peripheral edges of the one side surface 2a and the other side surface 2b by about 2.0 to 2.25 mm. The thickness T4 of the convex portion can be arbitrarily set, but is preferably about 10 mm from the viewpoint of the allowable holding range of the holder of the CAD / CAM processing apparatus.

Further, in the present invention, the recess 3a refers to a portion formed by recessing the ceramic body 1 for dental prosthesis when viewed from a plane direction.

In the ceramic body 1 for dental prosthesis according to the present invention, when the ceramic body 1 for dental prosthesis is viewed from a plane direction, some kind of mark is provided at a position other than the center on one side 2a. This mark indicates the direction of the outer shape of the dental prosthetic ceramic body 1. In the first embodiment, the recess 3a serves as a mark indicating the direction of the outer shape.

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 prosthetic ceramic body 1 according to the present invention, the recess 3a serves as a mark indicating the direction of the outer shape, so that the same appearance shape is prevented 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 and a convex portion 4 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.

Further, a concave portion 3a is formed in the porous dental prosthetic ceramic body 1 on which the convex portion 4 is formed. The recess 3a can be formed by machining with a machine tool such as an end mill of a milling lathe, a grinder, or a machining center. Alternatively, the concave portion 3a may be formed by press molding at the same time as the press molding of the convex portion 4.

The ceramic body 1 for dental prosthesis according to the present embodiment can be variously changed. For example, as shown in FIG. 4 as a first modification example, the recess 3a is placed on one side 2a and on the other side 2b when viewed from a plane direction. It may be formed so as not to hang on the top. Similarly, as shown in FIG. 5, the shape of the recess 3a may be rectangular, and the recess 3a may be formed so as to make point contact with the peripheral edge of the circular portion having the diameter D1.

Alternatively, as shown in FIG. 6, the concave portion 3a is formed so as to hang on one side 2a, and the concave portion 3a is formed until the convex portion 4 is interrupted, and the formation of the concave portion 3a is stopped there until the other surface 2b is reached. The recess 3a may be changed so as not to stretch. That is, the concave portion 3a is formed so as to serve as a stop groove at the portion of the convex portion 4.

By changing the recess 3a so as to serve as a retaining groove in this way, the recess 3a hangs on one side 2a and is not formed on the other side 2b, so that the appearance shape of the dental prosthetic ceramic body 1 extends in the vertical direction. Are not 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.

Alternatively, as shown in FIG. 7, the concave portion 3a may be formed obliquely with respect to the thickness T direction so that the convex portion 4 is interrupted in the peripheral edge direction from above one surface 2a to above the other surface 2b.

Alternatively, as shown in FIG. 8, the corners of the convex portion 4 due to the formation of the concave portion 3a may be chamfered by the chamfered portion 5 to prevent the corners of the convex portion 4 from being chipped.

Next, the ceramic body 1 for dental prosthesis according to the second embodiment of the present invention will be described with reference to FIGS. 9 to 11 as appropriate. For convenience of explanation, the ceramic body for dental prosthesis according to the second embodiment is also referred to as the ceramic body 1 for dental prosthesis, and the description overlapping with the ceramic body 1 for dental prosthesis of the first embodiment is omitted, and different parts. Only explain.

The difference between the dental prosthetic ceramic body 1 of the second embodiment and the first embodiment is that the shape of the recess 3a when viewed from the plane direction (for example, one side 2a direction) and the shape of the recess 3a when viewed from the other surface 2b direction. The point is that the shape of the recess 3a is different.

The shape of the recess 3a when viewed from the plane direction is the shape of the recess 3a when the dental prosthetic ceramic body 1 of FIG. 9 is viewed from the direction of arrow U. On the other hand, the shape of the recess 3a when viewed from the other surface 2b direction is the shape of the recess 3a when the dental prosthetic ceramic body 1 of FIG. 9 is viewed from the direction of arrow D. Further, in the present embodiment, the recesses 3a are formed so as to hang on one side 2a and the other side 2b, respectively.

In the present embodiment, the recess 3a is formed on one side 2a with a width W1 when viewed from the direction of the arrow U from FIGS. 9 and 10. On the other hand, when viewed from the direction of arrow D from FIGS. 9 and 11, the recess 3a is formed on the other surface 2b with a width W2 narrower than the width W1. Furthermore, the difference in dimensions between the widths W1 and W2 is set so that it can be visually recognized.

Therefore, according to the configuration of the second embodiment, the appearance shapes of the dental prosthetic ceramic body 1 in the vertical direction are not the same due to the difference in the dimensions of the widths W1 and W2. 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.

It should be noted that the shape of the recess 3a when viewed from the plane direction and the shape of the recess 3a when viewed from the other surface 2b direction need to be different, so the difference in the shape of the recess 3a is due to the difference in widths W1 and W2. Not limited.

Further, the concave portion 3a does not necessarily have to hang on one side 2a and the other side 2b, and the same effect can be obtained even if the width dimension of the concave portion 3a is different above and below the convex portion 4.

Further, in the second embodiment, various technical elements of FIGS. 6 to 8 described above can be applied.

Next, the dental prosthetic ceramic body 1 according to the third embodiment of the present invention will be described with reference to FIGS. 12 and 13. For convenience of explanation, the ceramic body for dental prosthesis according to the third embodiment is also referred to as the ceramic body 1 for dental prosthesis, and the description overlapping with the ceramic body 1 for dental prosthesis according to the first and second embodiments is omitted. , Only the different parts will be explained.

The difference between the dental prosthesis ceramic body 1 of the third embodiment and the above-described embodiments is that the dental prosthesis ceramic body 1 is formed in a planar direction (FIG. 12 in FIG. 12) in addition to the fact that one recess 3a is formed in advance. When viewed from the arrow P direction), at least another other recess (3b or 3c) is formed at a position of less than 180 ° over the peripheral direction of the dental prosthetic ceramic body 1.

FIG. 13 is a plan view of the dental prosthetic ceramic body 1 of FIG. 12 as viewed from the direction of arrow P. From FIG. 13, 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. However, only the recess 3a is formed on the alternate long and short dash line CL, and another recess 3b or 3c is formed at a different location.

With reference to the center position of the recess 3a, in FIG. 13, the recess 3b is formed at an arbitrary position less than 180 ° in the clockwise peripheral direction. On the other hand, a recess 3c is formed at an arbitrary position less than 180 ° in the counterclockwise peripheral direction.

As described above, at least one other recess (3b or 3c) is formed at an arbitrary position less than 180 ° with reference to one recess 3a. Therefore, when the dental prosthetic ceramic body 1 is turned upside down, the other recesses (3b or 3c) appear line-symmetrically with respect to the alternate long and short dash line CL when any one recess (for example, the recess 3a) is used as a reference. However, the overall shape of the dental prosthetic ceramic body 1 does not appear in the same shape even if it is turned upside down.

Therefore, the appearance shapes of the dental prosthetic ceramic body 1 in the vertical direction do 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 when viewed from the arrow P direction, it is possible to more reliably confirm the vertical direction of the dental prosthetic ceramic body 1.

The number of recesses formed can be set arbitrarily. However, when the center positions of the recesses are provided at equal intervals (for example, when the three recesses are provided at equal intervals of 120 °), the shapes of the recesses when viewed from the plane direction (arrow P direction in FIG. 12) are different. It is desirable from the viewpoint of confirming the peripheral direction and the vertical direction of the ceramic body 1 for dental prosthesis.

From FIG. 13, the width of the recess 3a of the third embodiment is shown to be narrower than the width of the recess 3a of the first embodiment. Further, the width of the recess 3b is set wider than the width of the recess 3a, and the shape of the recess 3c is formed so as to be different from the other two recesses 3a and 3b when viewed from the arrow P direction. ..

The recesses are not limited to three places as in the examples of FIGS. 12 and 13, and if the recesses are provided at any place less than 180 ° with a minimum of two places, the two recesses have the same shape when viewed from the plane direction. Even so, there is no problem. Further, four or more recesses may be provided.

Further, in the third embodiment, various technical elements of FIGS. 4 to 8 described above can be applied.

When a plurality of recesses are formed, as shown in FIG. 14, if at least one recess (3a in FIG. 14) is formed so as to relate to one side 2a or the other surface 2b, the other recesses (3b in FIG. 14) can be formed. Even if it is formed so as to hang only on the convex portion 4, it is possible to confirm the peripheral direction and the vertical direction of the dental prosthetic ceramic body 1.

Next, the ceramic body 1 for dental prosthesis according to the fourth embodiment of the present invention will be described with reference to FIGS. 15 to 17 as appropriate. For convenience of explanation, the ceramic body for dental prosthesis according to the fourth embodiment is also referred to as the ceramic body 1 for dental prosthesis, and the description overlapping with the ceramic body 1 for dental prosthesis of each embodiment is omitted, and only the different parts are omitted. explain.

The difference between the dental prosthetic ceramic body 1 of the fourth embodiment and the above-described embodiments is that the convex portion 4 is formed on at least a part of the peripheral edge of the circular portion having the diameter D1 and the D cut is in contact with the peripheral edge of the circular portion. This is the point where the surface 6a is formed. The D-cut surface 6a is formed at least one place on the dental prosthetic ceramic body 1, and the D-cut surface 6a is a mark indicating the direction of the outer shape of the dental prosthetic ceramic body 1.

Since the D-cut surface 6a 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 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 prosthetic ceramic body 1 according to the present invention, the D-cut surface 6a serves as a mark indicating the direction of the outer shape, so that the same appearance shape is prevented 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 D-cut surface 6a, the width dimension of the D-cut surface 6a is formed so as to be visible.

The D-cut surface 6a can be formed by machining with a machine tool such as an end mill of a milling lathe, a grinder, or a machining center. Alternatively, the D-cut surface 6a may be formed by press molding at the same time as the press molding of the convex portion 4.

Next, the ceramic body 1 for dental prosthesis according to the fifth embodiment of the present invention will be described with reference to FIGS. 18 and 19 as appropriate. For convenience of explanation, the ceramic body for dental prosthesis according to the fifth embodiment is also referred to as the ceramic body 1 for dental prosthesis, and the description overlapping with the ceramic body 1 for dental prosthesis of each embodiment is omitted, and only the different parts are omitted. explain.

The difference between the dental prosthetic ceramic body 1 of the fifth embodiment and the above-described embodiments is that the dental prosthesis ceramic body 1 is formed in a plane direction (FIG. When viewed from the arrow P direction of 18), at least another D-cut surface 6b is formed at a position of less than 180 ° over the peripheral direction of the dental prosthetic ceramic body 1.

FIG. 19 is a plan view of the dental prosthetic ceramic body 1 of FIG. 18 as viewed from the direction of arrow P. From FIG. 19, the alternate long and short dash line CL is shown so as to pass through the center of the D-cut surface 6a and the center on the single surface 2a. Therefore, based on the D-cut surface 6a, the point 180 ° through the center on the one-sided surface 2a is the point on the alternate long and short dash line CL. However, only the D-cut surface 6a is formed on the alternate long and short dash line CL, and another D-cut surface 6b is formed at a different location.

With reference to the center position of the D-cut surface 6a, the D-cut surface 6b is formed at an arbitrary position less than 180 ° in the counterclockwise peripheral direction in FIG.

As described above, at least one other D-cut surface 6b is formed at an arbitrary position less than 180 ° with reference to one D-cut surface 6a. Therefore, when the dental prosthetic ceramic body 1 is turned upside down, if any one D-cut surface (for example, D-cut surface 6a) is used as a reference, the other D-cut surface 6b appears line-symmetrically with respect to the alternate long and short dash line CL. .. However, the overall shape of the dental prosthetic ceramic body 1 does not appear in the same shape even if it is turned upside down.

Therefore, the appearance shapes of the dental prosthetic ceramic body 1 in the vertical direction do 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.

The number of D-cut surfaces that can be formed can be set arbitrarily, but at least two locations should be provided at any location less than 180 ° to check the peripheral and vertical directions of the dental prosthetic ceramic body 1 and to the holder. Desirable in terms of positioning. Further, four or more D-cut surfaces may be provided.

Next, the ceramic body 1 for dental prosthesis according to the sixth embodiment of the present invention will be described with reference to FIGS. 20 to 22 as appropriate. For convenience of explanation, the ceramic body for dental prosthesis according to the sixth embodiment is also referred to as the ceramic body 1 for dental prosthesis, and the description overlapping with the ceramic body 1 for dental prosthesis of each embodiment is omitted, and only the different parts are omitted. explain.

The difference between the dental prosthetic ceramic body 1 of the sixth embodiment and the above-described embodiments is that the convex portion 4 is formed on at least a part of the peripheral edge of the circular portion having the diameter D1, and one side 2a having a disk-shaped outer shape is formed. Alternatively, the protruding portion 7a or 7b is provided on the same plane as at least one of the other surfaces 2b. At least one protruding portion 7a or 7b is formed on the dental prosthetic ceramic body 1, and the protruding portion 7a or 7b is a mark indicating the direction of the outer shape of the dental prosthetic ceramic body 1.

The amount of protrusion of the protrusion 7a or 7b in the radial direction of the dental prosthetic ceramic body 1 is equal to or greater than the amount of protrusion of the protrusion 4. The protrusion amount is the amount of protrusion in the radial direction of the dental prosthetic ceramic body 1 from the peripheral edges of the one side surface 2a and the other side surface 2b formed by the diameter D1.

In the embodiment of FIGS. 20 to 22, the protruding amount of the protruding portions 7a and 7b is set to be equivalent to the protruding amount of the convex portion 4, and the protruding portions 7a and 7b and a part of the convex portion 4 are integrated. The form of continuous molding is shown in the figure.

Since the protruding portion 7a or 7b 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 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 prosthetic ceramic body 1 according to the present invention, the protruding portion 7a or 7b serves as a mark indicating the direction of the outer shape, so that the same appearance shape is prevented from appearing in the peripheral direction thereof. To. 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 protruding portion 7a or 7b, the width dimension of the protruding portion 7a or 7b is formed so as to be visible.

The protrusion 7a or 7b can be formed by machining with a machine tool such as an end mill of a milling lathe or a machining center. Alternatively, the protruding portions 7a or 7b may be formed by press molding at the same time as the press molding of the convex portion 4.

Further, the protruding amount of the protruding portion 7a or 7b may exceed the protruding amount of the convex portion 4.

Alternatively, as shown in FIGS. 23 and 24, the protrusion 7b may not be formed. That is, the protruding portion 7a may be changed so as to be formed only on the one side 2a side with respect to the convex portion 4. By changing in this way, since the protruding portion 7a is formed only on the one side 2a side above and below the convex portion 4, the appearance shape of the dental prosthetic ceramic body 1 in the vertical direction is not 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.

Alternatively, as shown in FIG. 25, the protruding portions 7a and 7b may be formed so as to be offset in the peripheral direction with the convex portion 4 interposed therebetween.

Next, the dental prosthetic ceramic body 1 according to the seventh embodiment of the present invention will be described with reference to FIG. 26 as appropriate. For convenience of explanation, the ceramic body for dental prosthesis according to the seventh embodiment is also referred to as the ceramic body 1 for dental prosthesis, and the description overlapping with the ceramic body 1 for dental prosthesis of each embodiment is omitted, and only the different parts are omitted. explain.

The difference between the dental prosthetic ceramic body 1 of the seventh embodiment and the above-described embodiments is the shape of the protruding portion 7a when viewed from the plane direction (direction from the upper side of FIG. 26) and the other surface 2b direction (direction from the upper side in FIG. 26). The point is that the shape of the protruding portion 7b when viewed from the lower side of FIG. 26) is different.

In the present embodiment, the protruding portion 7a is formed with a width W1 in the peripheral direction of the dental prosthetic ceramic body 1 when viewed from the plane direction from FIG. 26. On the other hand, when viewed from the other surface 2b direction, the protruding portion 7b is formed with a width W2 narrower than the width W1 in the peripheral direction. Furthermore, the difference in dimensions between the widths W1 and W2 is set so that it can be visually recognized.

Therefore, according to the configuration of the present embodiment, the appearance shapes of the dental prosthetic ceramic body 1 in the vertical direction are not the same due to the difference in the dimensions of the widths W1 and W2. 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.

It is sufficient that the shape of the protrusion 7a when viewed from the plane direction and the shape of the protrusion 7b when viewed from the other surface 2b direction are different, so that the difference in the shapes of the protrusions 7a and 7b is the width W1. , Not limited to the difference in W2.

Further, the above-mentioned technical elements of FIG. 25 can also be applied to this embodiment.

Next, the dental prosthesis ceramic body 1 according to the eighth embodiment of the present invention will be described with reference to FIG. 27 as appropriate. For convenience of explanation, the ceramic body for dental prosthesis according to the eighth embodiment is also referred to as the ceramic body 1 for dental prosthesis, and the description overlapping with the ceramic body 1 for dental prosthesis of each embodiment is omitted, and only the different parts are omitted. explain.

The difference between the dental prosthetic ceramic body 1 of the eighth embodiment and the above-described embodiments is that at least one protruding portion 7a is formed in advance and the dental prosthetic ceramic body 1 is viewed from a plane direction. At that time, at least another protruding portion 7c is formed at a position of less than 180 ° over the peripheral direction of the dental prosthetic ceramic body 1.

From FIG. 27, the alternate long and short dash line CL is shown so as to pass through the center of the protrusion 7a and the center on one side 2a. Therefore, with reference to the protruding portion 7a, the portion 180 ° through the center on one side 2a is the location on the alternate long and short dash line CL. However, only the protrusion 7a is formed on the alternate long and short dash line CL, and another protrusion 7c is formed at a different location.

With reference to the center position of the protrusion 7a, the protrusion 7c is formed at an arbitrary position less than 180 ° in the counterclockwise peripheral direction in FIG. 27.

As described above, at least one other protrusion 7c is formed at an arbitrary position less than 180 ° with reference to one protrusion 7a. Therefore, when the dental prosthodontic ceramic body 1 is turned upside down, the other protruding portion 7c appears line-symmetrically with respect to the alternate long and short dash line CL when any one protruding portion (for example, the protruding portion 7a) is used as a reference. However, the overall shape of the dental prosthetic ceramic body 1 does not appear in the same shape even if it is turned upside down.

Therefore, the appearance shapes of the dental prosthetic ceramic body 1 in the vertical direction do 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.

The number of protrusions to be formed can be set arbitrarily, but it is necessary to set at least two places and provide them at any place less than 180 ° to check the peripheral direction and vertical direction of the dental prosthetic ceramic body 1 and position it with respect to the holder. From the point of view, it is desirable. Further, four or more protrusions may be provided in the peripheral direction.

Further, in this embodiment as well, various technical elements of FIG. 25 or FIG. 26 described above can be applied.

In the present invention, the marks indicating the direction of the outer shape are not only the recesses 3a to 3c, the D-cut surfaces 6a and 6b, and the protrusions 7a to 7c described in each embodiment, but also one side 2a depending on the ink. Any visible items such as the marks written above and the marks formed so as not to be erased, such as the markings on one side 2a, are assumed to be included. However, all of these marks indicating the direction of the outer shape shall be provided at locations other than the center on one side 2a when viewed from the plane direction.

1 Ceramic body for dental prosthesis
2a one side
2b other side
3a, 3b, 3c Concave 4 Convex 5 Chamfer
D1 Diameter T Thickness of ceramic body for dental prosthesis
T4 Convex thickness
W1 Width of recess or protrusion
W2 Width of recess or protrusion
6a, 6b D cut surface
7a, 7b, 7c protrusions
CL alternate long and short dash line?

Claims (9)

Dentistry that is formed into a disk-shaped outer shape with a circular plane shape, has a diameter of 50 mm or more, and is provided with a mark indicating the direction of the outer shape at a place other than the center on one side when viewed from the plane direction. Ceramic body for prosthesis. A convex portion is formed on at least a part of the peripheral edge of the circular portion having the diameter.
A recess is formed to interrupt the convex portion in the peripheral direction, and at least one recess is formed.
The ceramic body for dental prosthesis according to claim 1, wherein the formed recess is the mark. The ceramic body for dental prosthesis according to claim 2, wherein the shape of the concave portion when viewed from the plane direction is different from the shape of the concave portion when viewed from the other surface direction. The ceramic body for dental prosthesis according to claim 2 or 3, wherein at least one other concave portion is formed at a position of less than 180 ° over the peripheral direction when viewed from the plane direction. A convex portion is formed on at least a part of the peripheral edge of the circular portion having the diameter.
A D-cut surface in contact with the peripheral edge of the circular portion is formed, and at least one D-cut surface is formed.
The ceramic body for dental prosthesis according to claim 1, wherein the D-cut surface is the mark. The ceramic body for dental prosthesis according to claim 5, wherein at least one other D-cut surface is formed at a position of less than 180 ° over the peripheral direction when viewed from the plane direction. A convex portion is formed on at least a part of the peripheral edge of the circular portion having the diameter.
A protrusion is provided on the same plane as at least one plane of one side or the other side of the disk-shaped outer shape.
The amount of protrusion of the protruding part is equal to or greater than the amount of protrusion of the convex part.
At least one protrusion is formed,
The ceramic body for dental prosthesis according to claim 1, wherein the protruding portion is the mark. The ceramic body for dental prosthesis according to claim 7, wherein the shape of the protruding portion when viewed from the plane direction is different from the shape of the protruding portion when viewed from the other surface direction. The ceramic body for dental prosthesis according to claim 7 or 8, wherein at least one other protruding portion is formed at a position of less than 180 ° over the peripheral direction when viewed from the plane direction.

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