JP2018047017A - Ceramic body for dental prosthesis - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ceramic body for dental prosthesis facilitating check and positioning of a peripheral direction of the ceramic body for the dental prosthesis with respect to a holding tool of a processing device and, in cutting work, being accurately positioned with respect to the holding tool.SOLUTION: The ceramic body for dental prosthesis is molded into a disk-like external shape having a circular planar shape, has a diameter of 50 mm or more, and includes marks representing a direction of the external shape at parts other than a center on one surface when viewing from the plane direction. Further a projection is formed at least at a part of a peripheral edge of a circular shape with the diameter of 50 mm or more, and a recess for breaking the projection in the peripheral direction is formed, where one or more recesses are formed, and the formed recesses are marks representing the direction of the outer shape.SELECTED DRAWING: Figure 1

Description

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

  As a material used for restoration of a tooth partially lost due to caries or the like, a composite material called a composite resin made of an inorganic substance and an organic substance, a metal, or ceramics is used. In particular, ceramics are excellent not only in wear resistance but also in 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 installed in the oral cavity was configured by coating the surface of a metal frame with ceramics adjusted to the color of natural teeth, but the entire prosthesis was made of ceramics. Ceramic prostheses are also being used. An all-ceramic prosthesis is one in which an exterior portion (ie, a ceramic layer) is formed of glass porcelain on the surface thereof using, for example, a frame made of a ceramic sintered body instead of a conventional metal frame.

  All-ceramic prosthesis is made of ceramics as a whole, so natural allergy caused by metal contact with the living body and natural teeth inherent to the opaque underlying layer provided to hide the metal color Various problems such as aesthetics that the color tone cannot be obtained can be suppressed or eliminated.

  Since 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 apparatus. By using a CAD / CAM processing device for dentistry, the shape of the dental prosthesis can be designed on the screen using a computer, and the dental prosthesis designed by automatic cutting of the ceramic block body A desired dental prosthesis can be manufactured by cutting into the shape of the object. Therefore, many high-quality ceramic dental prostheses can be produced in a short time.

  The manufacturing methods using this dental CAD / CAM processing apparatus 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 of cutting an unsintered ceramic molded body and then sintering the ceramic molded body subjected to the cutting process. The third method is a method in which the temporarily sintered ceramic body is cut and then sintered.

  The first method is a method of cutting a ceramic sintered body sintered at about 1300 to 1600 ° C. or subjected to hot isostatic pressing (HIP), and the dimensions of the ceramic body after cutting. There is no change. Therefore, a dental prosthesis with high dimensional accuracy according to the accuracy of the measuring machine or processing machine of the CAD / CAM processing apparatus can be manufactured. On the other hand, since the ceramic sintered body has a high hardness, there is a problem that the cutting time is increased and the tool life of a drill or the like is shortened, resulting in an increase in manufacturing cost.

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

  In contrast, the third method calculates the shrinkage ratio of the main sintering from the shrinkage ratio at the time of pre-sintering, cuts the ceramic body in consideration of this, and then sinters at 1300-1600 ° C. It is. Since the pre-sintered ceramic body has a lower hardness than the sintered ceramic body that has been subjected to the main sintering, it is possible to shorten the cutting time, and there is an advantage that the tool life is extended. Moreover, since degreasing is completed by temporary sintering, there is also an advantage that the main sintering time after cutting is shortened. For this reason, most dental prostheses made of ceramics are produced by the third method.

  In addition, the pre-sintered ceramic body is shaped into a circular shape, and a convex portion is provided around the entire periphery. The convex portion is engaged from above and below by a holder of a CAD / CAM processing device to hold the ceramic body. And a ceramic body are disclosed (for example, see 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 on the entire periphery, and therefore has the same external shape in the peripheral direction and in the vertical direction (back and front directions). It will appear.

  When a part of the ceramic body is cut with a CAD / CAM machine and then cut again with a CAD / CAM machine, a dental prosthesis from the previous cutting process is partially formed on the ceramic body. Therefore, the confirmation of the peripheral direction and the accuracy of positioning are more important. However, since the same appearance shape appears in the peripheral direction in 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 processing. Provided is a ceramic body for dental prosthesis that can be accurately positioned.

  The above problems are solved by the present invention described below. That is, the dental prosthetic ceramic body of the present invention is formed into a disc-like outer shape with a circular planar shape, has a diameter of 50 mm or more, and has an outer shape at a location excluding the center on one side when viewed from the plane direction. A mark indicating the direction is provided.

  Furthermore, 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 that interrupts the convex portion in the peripheral direction is formed. In addition, at least one or more recesses are formed, and the formed recesses are preferably marks indicating the direction of the outer shape.

  Furthermore, in another embodiment of the ceramic body for dental prosthesis according to the present invention, it is preferable that the shape of the recess when viewed from the plane direction is different from the shape of the recess when viewed from the other surface direction.

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

  In one embodiment of the ceramic body for dental prosthesis according to the present invention, a convex portion is formed on at least a part of the periphery of a circular portion having a diameter of 50 mm or more, and a D-cut surface in contact with the periphery of the circular portion is formed. In addition, at least one D-cut surface is preferably formed, and the D-cut surface is preferably a mark indicating the direction of the outer shape.

  Furthermore, in another embodiment of the ceramic body for dental prosthesis according to the present invention, at least one other D-cut surface is formed at a position less than 180 ° along the peripheral direction when viewed from the planar 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 periphery of a circular portion having a diameter of 50 mm or more, and at least one of one side or the other side of a disk-like outer shape. The projection is provided on the same plane as the projection, the projection amount of the projection is greater than or equal to the projection amount of the projection, at least one projection is formed, and the projection indicates the direction of the outer shape. Preferably there is.

  Furthermore, in another embodiment of the ceramic body for dental prosthesis of the present invention, it is preferable that the shape of the protrusion when viewed from the plane direction is different from the shape of the protrusion when viewed from the other surface direction.

  Further, in another embodiment of the ceramic body for dental prosthesis according to the present invention, it is preferable that at least one other protrusion is formed at a position of less than 180 ° along the peripheral direction when viewed from the planar 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 apparatus, and it is accurate with respect to the holder during cutting. It becomes possible to position the ceramic body for dental prosthesis.

1 is a perspective view of a ceramic body for dental prosthesis according to a first embodiment of the present invention. (A) It is a top view when the dental prosthetic ceramic body of FIG. 1 is seen from the arrow P direction. (B) It is a side view when the dental prosthetic ceramic body of FIG. 1 is seen from the arrow S direction. It is the elements on larger scale of circle A of Drawing 2 (a). (A) It is a top view which shows the 1st modification of the ceramic body for dental prostheses which concerns on 1st Embodiment. (B) It is the elements on larger scale of circle B of Drawing 4 (a). It is the elements on larger scale which show the example of a change of FIG.4 (b). (A) It is a perspective view which shows the 2nd modification of the ceramic body for dental prostheses which concerns on 1st Embodiment. (B) It is a side view when the dental prosthetic ceramic body of FIG. 6 (a) is viewed from the arrow S direction. It is a side view which shows the 3rd modification of the ceramic body for dental prostheses which concerns on 1st Embodiment. (A) It is a top view which shows the 4th modification of the ceramic body for dental prostheses which concerns on 1st Embodiment. (B) It is the elements on larger scale of circle C of Drawing 8 (a). It is a side view of the ceramic body for dental prosthesis based on the 2nd Embodiment of this invention. (A) It is a top view when the dental prosthetic ceramic body of FIG. 9 is seen from the arrow U direction. (B) It is the elements on larger scale of circle D of Drawing 10 (a). (A) It is a top view when the dental prosthetic ceramic body of FIG. 9 is seen from the arrow D direction. (B) It is the elements on larger scale of the circle E of Drawing 11 (a). It is a perspective view of the ceramic body for dental prostheses which concerns on the 3rd Embodiment of this invention. It is a top view when the ceramic body for dental prosthesis of FIG. 12 is seen from the arrow P direction. It is a top view which shows the example of a change of the ceramic body for dental prostheses which concerns on 3rd Embodiment. It is a perspective view of the ceramic body for dental prostheses which concerns on the 4th Embodiment of this invention. It is a top view when the ceramic body for dental prosthesis of FIG. 15 is seen from the arrow P direction. It is a side view when the dental prosthetic ceramic body of FIG. 15 is seen from the arrow S direction. It is a perspective view of the ceramic body for dental prostheses which concerns on the 5th Embodiment of this invention. It is a top view when the ceramic body for dental prosthesis of FIG. 18 is seen from the arrow P direction. It is a perspective view of the ceramic body for dental prostheses which concerns on the 6th Embodiment of this invention. It is a top view when the ceramic body for dental prosthesis of FIG. 20 is seen from the arrow P direction. It is a side view when the dental prosthetic ceramic body of FIG. 20 is seen from the arrow S direction. It is a perspective view which shows the 1st modification of the ceramic body for dental prostheses which concerns on 6th Embodiment. It is a side view when the dental prosthetic ceramic body of FIG. 24 is viewed from the direction of arrow S. It is a side view which shows the 2nd modification of the ceramic body for dental prostheses which concerns on 6th Embodiment. It is a side view of the ceramic body for dental prostheses which concerns on the 7th Embodiment of this invention. It is a top view of the ceramic body for dental prostheses which concerns on the 8th Embodiment of this invention.

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

  According to this configuration, the peripheral direction of the dental prosthetic ceramic body can be easily confirmed and positioned with respect to the holder of the CAD / CAM processing apparatus, and the dental prosthetic ceramic body can be accurately attached to the holder during cutting. Positioning becomes possible.

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

  In the present invention, the disc-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 refers to 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 ruled lines, etc. Anything that can be seen will be included.

  In the present invention, the dental prosthetic ceramic body refers to a solid body made of ceramics having a disk-like outer shape and produced by pre-sintering. Furthermore, pre-sintering refers to a process of producing a solid body (solid body made of ceramics) from a ceramic material, and includes half-sintering, pre-sintering, or semi-sintering that is conventionally used.

  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 formed, and the formed recess is a mark indicating the direction of the outer shape.

  According to this configuration, the peripheral direction of the dental prosthetic ceramic body can be easily confirmed and positioned with respect to the holder of the CAD / CAM processing apparatus, and the dental prosthetic ceramic body can be accurately attached to the holder during cutting. Positioning becomes possible.

  Further, the concave portion is formed so as to be hung on one side, and the concave portion is formed to a location 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. The confirmation and positioning of the ceramic body for dental prosthesis in the vertical direction is also facilitated.

  In the present invention, the convex portion is a portion formed so as to protrude in a convex shape over the peripheral direction of the dental prosthetic ceramic body when the dental prosthetic ceramic body is viewed from the side. It refers to what is formed on at least a part of the peripheral edge of the ceramic body for prosthesis.

  Moreover, in this invention, a recessed part refers to the location currently formed in concave shape, when the dental prosthetic ceramic body is seen from a planar direction.

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

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

  According to these structures, it becomes easy to confirm and position the peripheral direction of the dental prosthetic ceramic body with respect to the holder of the CAD / CAM processing apparatus, and the dental prosthetic ceramic body accurately with respect to the holder during the cutting process. Can be positioned. Furthermore, confirmation and positioning of the dental prosthetic ceramic body with respect to the holder in the vertical direction are facilitated.

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

  According to this configuration, the peripheral direction of the dental prosthetic ceramic body can be easily confirmed and positioned with respect to the holder of the CAD / CAM processing apparatus, and the dental prosthetic ceramic body can be accurately attached to the holder during cutting. Positioning becomes possible.

  The sixth feature is that at least one other D-cut surface is formed at a position of less than 180 ° along the peripheral direction when viewed from the plane direction.

  According to this configuration, the peripheral direction of the dental prosthetic ceramic body can be easily confirmed and positioned with respect to the holder of the CAD / CAM processing apparatus, and the dental prosthetic ceramic body can be accurately attached to the holder during cutting. Positioning becomes possible. Furthermore, confirmation and positioning of the dental prosthetic ceramic body with respect to the holder in the vertical direction are facilitated.

  The seventh feature is that a convex portion is formed on at least a part of the periphery 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-like outer shape. Is provided, the protruding amount of the protruding portion is equal to or more than the protruding amount of the protruding 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, the peripheral direction of the dental prosthetic ceramic body can be easily confirmed and positioned with respect to the holder of the CAD / CAM processing apparatus, and the dental prosthetic ceramic body can be accurately attached to the holder during cutting. Positioning becomes possible.

  In the present invention, the protruding amount of the protruding portion is the protruding amount in the radial direction of the ceramic body for dental prosthesis from the peripheral edge of one surface 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, when viewed from the plane direction, at least one other protrusion is formed at a position of less than 180 ° along the peripheral direction.

  According to these structures, it becomes easy to confirm and position the peripheral direction of the dental prosthetic ceramic body with respect to the holder of the CAD / CAM processing apparatus, and the dental prosthetic ceramic body accurately with respect to the holder during the cutting process. Can be positioned. Furthermore, confirmation and positioning of the dental prosthetic ceramic body with respect to the holder in the vertical direction are facilitated.

  Hereinafter, a dental prosthetic ceramic body 1 according to a first embodiment of the present invention and a method for manufacturing the same will be described with reference to FIGS. The dental prosthetic ceramic body 1 according to the first embodiment is formed into a disk-like 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 disc-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 planar shape of a perfect circle 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. FIGS. 1 to 3 show an embodiment in which one recess 3a is formed on one side 2a and a part on the other side 2b. Further, the recess 3a is formed in parallel to the thickness T direction from the one surface 2a to the other surface 2b.

  The dental prosthesis ceramic body 1 is used as a block body for cutting for producing a dental prosthesis by cutting, and indicates a solid body made of ceramics produced by temporary sintering. Furthermore, pre-sintering refers to a step of producing a solid body (solid body made of ceramics) from a ceramic material, and includes half-sintering, pre-sintering, or semi-sintering that is conventionally used.

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

  Further, the diameter D1 on the one surface 2a and the other surface 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 value 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 apparatus.

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

  Further, in the dental prosthetic ceramic body 1, a convex portion 4 is formed on at least a part of the periphery of the circular portion having the diameter D1. Furthermore, a concave portion 3a is formed that interrupts the convex portion 4 in the peripheral direction of the dental prosthetic ceramic body 1. At least one recess 3a is formed. Note that the roundness of the imaginary line when the outer periphery of the discontinuously formed convex portions 4 is continuously connected is also 1 mm or less.

  In the present invention, the convex portion 4 is a portion formed so as to project in a convex shape over the peripheral direction of the dental prosthetic ceramic body 1 when the dental prosthetic ceramic body 1 is viewed from the side surface direction. It refers to what is formed on at least a part of the peripheral edge of the ceramic body 1 for dental prosthesis. Furthermore, the convex part 4 protrudes from the periphery of the one surface 2a and the other surface 2b by about 2.0-2.25 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 concave portion 3a refers to a portion formed in a concave shape when the dental prosthetic ceramic body 1 is viewed from the planar direction.

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

  By forming the concave portion 3a, the concave portion 3a becomes a mark indicating the direction of the outer shape, so that the same appearance shape can be prevented from appearing in the peripheral direction of the dental prosthetic ceramic body 1. When a part of the ceramic body for dental prosthesis 1 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 previous cutting time is Since the dental prosthesis ceramic body 1 is formed, the confirmation of the peripheral direction and the accuracy of positioning are more important.

  Even in such a usage situation, in the dental prosthetic ceramic body 1 according to the present invention, the concave portion 3a becomes a mark indicating the direction of the outer shape, so that the same appearance shape is prevented from appearing in the peripheral direction. Therefore, the confirmation and positioning of the peripheral direction of the dental prosthetic ceramic body 1 with respect to the holder are facilitated, and the dental prosthetic ceramic body 1 can be accurately positioned with respect to the holder during cutting.

  In addition, since the said effect should just be acquired by forming the recessed part 3a, the width dimension of the recessed part 3a should just be formed to the extent which can be visually observed.

  Next, the manufacturing method of 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-like outer shape and the convex portion 4 like the ceramic body 1 for dental prosthesis. The molding is press molding or molding with a machine tool. Examples of the machine tool include a milling lathe and a machining center.

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

The sintering temperature at which the theoretical density is obtained refers to the sintering temperature at which a ceramic sintered body made of a desired ceramic material can obtain the theoretical density. Specifically, 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 It refers to the sintering temperature when the resulting 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 is obtained is as follows. Silica 1400 ° C, Alumina 1550 ° C, Zirconia 1450 ° C, Hydroxyapatite 1300 ° C, β-TCP 1300 ° C.

  The temporary sintering temperature of the porous dental prosthetic ceramic body 1 depends on the type and particle size of the ceramic material, but is preferably equal to or lower than the temperature at which the pores of the porous body are not blocked even if the preliminary sintering proceeds. Is pre-sintered at 850 ° C. or higher and 1050 ° C. or lower. The atmosphere for pre-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, as described above, the ceramic material powder may be molded and temporarily sintered, or an organic binder or an inorganic binder may be added to the ceramic material powder and then molded and temporarily sintered.

  Furthermore, 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. Or you may form the recessed part 3a by press molding simultaneously with the press molding of the said convex part 4. FIG.

  The dental prosthetic ceramic body 1 according to the present embodiment can be variously modified. For example, as shown in FIG. 4 as a first modification, the concave portion 3a is formed on one side 2a and the other side 2b when viewed from the plane direction. You may form so that it may not hung on. 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 periphery of the circular portion having the diameter D1.

  Alternatively, as shown in FIG. 6, the concave portion 3a is formed on one side 2a, and the concave portion 3a is formed up to a point where the convex portion 4 is interrupted. Then, the formation of the concave portion 3a is stopped and the other surface 2b is not formed. The recess 3a may be changed so as not to extend. That is, the recess 3a is formed to be a stop groove at the location of the protrusion 4.

  By changing the recess 3a to be a stop groove in this way, the recess 3a is hung on one side 2a and is not formed on the other side 2b. Therefore, the external shape of the dental prosthetic ceramic body 1 in the vertical direction is shown. Are not the same. Therefore, in addition to the confirmation and positioning in the peripheral direction, the vertical confirmation and positioning of the dental prosthetic ceramic body 1 with respect to the holder of the CAD / CAM processing apparatus can be facilitated, and the dental prosthesis with respect to the holder during cutting is facilitated. The vertical direction of the ceramic body 1 can also be accurately positioned.

  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 direction from the one surface 2a to the other surface 2b.

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

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

  The ceramic body 1 for dental prosthesis of the second embodiment is different from the first embodiment in that the shape of the recess 3a when viewed from the plane direction (for example, the direction of one side 2a) and the direction of the other surface 2b. 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 the 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 arrow D direction. Furthermore, in the present embodiment, the recesses 3a are formed so as to hang over the one surface 2a and the other surface 2b, respectively.

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

  Therefore, according to the configuration of the second embodiment, the appearance shape of the dental prosthetic ceramic body 1 in the vertical direction is not the same due to the difference in the dimensions of the widths W1 and W2. Therefore, in addition to the confirmation and positioning in the peripheral direction, the vertical verification and positioning of the dental prosthetic ceramic body 1 with respect to the holder of the CAD / CAM processing apparatus can be facilitated, and the dental prosthesis can be applied to the holder during the cutting process. The vertical direction of the ceramic body 1 can also be accurately positioned.

  Note 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 only be different, so the difference in the shape of the recess 3a is the difference between the widths W1 and W2. It is not limited.

  Further, the recess 3a does not necessarily have to be on the one surface 2a and the other surface 2b, and the same effect can be obtained even if the width of the recess 3a is made different between the upper and lower portions of the protrusion 4.

  In the second embodiment, various technical elements shown in FIGS. 6 to 8 can be applied.

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

  The ceramic body for dental prosthesis 1 of the third embodiment is different from each of the above embodiments in that the concave body 3a is formed in advance, and the ceramic body for dental prosthesis 1 is planar (see FIG. 12). When viewed from the direction of the arrow P), at least another another recess (3b or 3c) is formed at a position of less than 180 ° along 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 the arrow P. From FIG. 13, a one-dot chain line CL is shown so as to pass through the center of the recess 3a and the center on one side 2a. Accordingly, when the recess 3a is used as a reference, the 180 ° portion passing through the center on the one surface 2a is the portion 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, the recess 3b is formed at an arbitrary position of less than 180 ° in the clockwise circumferential direction in FIG. On the other hand, a recess 3c is formed at an arbitrary position of less than 180 ° along the counterclockwise peripheral direction.

  As described above, at least one other recess (3b or 3c) is formed at an arbitrary position of less than 180 ° with reference to one recess 3a. Therefore, when the dental prosthesis ceramic body 1 is turned upside down, if any one of the concave portions (for example, the concave portion 3a) is used as a reference, the other concave portion (3b or 3c) appears in line symmetry 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 external appearance shape of the dental prosthetic ceramic body 1 in the vertical direction does not appear the same. Therefore, in addition to the confirmation and positioning in the peripheral direction, the vertical verification and positioning of the dental prosthetic ceramic body 1 with respect to the holder of the CAD / CAM processing apparatus can be facilitated, and the dental prosthesis can be applied to the holder during the cutting process. The vertical direction of the ceramic body 1 can also be accurately positioned. Furthermore, it becomes possible to confirm the vertical direction of the dental prosthetic ceramic body 1 more reliably by making the shapes of the concave portions 3a to 3c different from the direction of the arrow P.

  The number of recesses formed can be arbitrarily set. However, when the center positions of the respective recesses 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 direction (the direction of arrow P in FIG. 12) is different. It is desirable from the viewpoint of confirmation of 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. Furthermore, the width of the recess 3b is set wider than the width of the recess 3a, and the shape of the recess 3c is different from the other two recesses 3a and 3b when viewed from the direction of the arrow P. .

  The recesses are not limited to three places as in the examples of FIGS. 12 and 13, and at least two places, provided that they are provided at an arbitrary place of less than 180 °, the two recesses have the same shape when viewed from the plane direction. But there is no problem. Moreover, you may provide four or more recessed parts.

  Also, the technical elements of the above-described FIGS. 4 to 8 can be applied to the third embodiment.

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

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

  The ceramic body 1 for dental prosthesis of the fourth embodiment is different from the above embodiments in that a convex portion 4 is formed on at least a part of the periphery of the circular portion having the diameter D1, and the D cut is in contact with the periphery of the circular portion. The surface 6a is formed. At least one D-cut surface 6a is formed on the dental prosthetic ceramic body 1, and the D-cut surface 6a is a mark indicating the direction of the external shape of the dental prosthetic ceramic body 1.

  Since the D-cut surface 6a is a mark indicating the direction of the outer shape, it is possible to prevent the same appearance shape from appearing along the peripheral direction of the ceramic body 1 for dental prosthesis. When a part of the ceramic body for dental prosthesis 1 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 previous cutting time is Since the dental prosthesis ceramic body 1 is formed, the confirmation of the peripheral direction and the accuracy of positioning are more important.

  Even in such a use situation, in the dental prosthetic ceramic body 1 according to the present invention, since the D-cut surface 6a becomes a mark indicating the direction of the outer shape, it is prevented that the same outer shape appears in the peripheral direction. . Therefore, the confirmation and positioning of the peripheral direction of the dental prosthetic ceramic body 1 with respect to the holder are facilitated, and the dental prosthetic ceramic body 1 can be accurately positioned with respect to the holder during cutting.

  In addition, since the said effect should just be acquired by forming D cut surface 6a, suppose that the width dimension of D cut surface 6a is formed in the grade which can be visually observed.

  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 simultaneously with the press molding of the convex portion 4.

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

  The difference between the ceramic body 1 for dental prosthesis of the fifth embodiment from the above embodiments is that the D-cut surface 6a is formed in one place in advance, and the ceramic body 1 for dental prosthesis is planar (see FIG. 18 in the direction of arrow P), at least another D-cut surface 6b is formed at a position of less than 180 ° along the peripheral direction of the dental prosthetic ceramic body 1.

  FIG. 19 is a plan view when the dental prosthetic ceramic body 1 of FIG. 18 is viewed from the direction of the 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 of the one surface 2a. Therefore, when the D-cut surface 6a is used as a reference, a portion at 180 ° passing through the center on the one surface 2a is a portion 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 of 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 of 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, the D-cut surface 6a) is used as a reference, the other D-cut surface 6b appears in line symmetry 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 external appearance shape of the dental prosthetic ceramic body 1 in the vertical direction does not appear the same. Therefore, in addition to the confirmation and positioning in the peripheral direction, the vertical verification and positioning of the dental prosthetic ceramic body 1 with respect to the holder of the CAD / CAM processing apparatus can be facilitated, and the dental prosthesis can be applied to the holder during the cutting process. The vertical direction of the ceramic body 1 can also be accurately positioned.

  The number of D-cut surfaces formed can be set arbitrarily, but it is necessary to provide at least two locations and at any location less than 180 ° for confirmation of the peripheral direction and vertical direction of the dental prosthetic ceramic body 1 and the holder. This is desirable from the standpoint of positioning. Further, four or more D-cut surfaces may be provided.

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

  The dental prosthetic ceramic body 1 of the sixth embodiment is different from each of the embodiments described above in that a convex portion 4 is formed on at least a part of the periphery of a circular portion having a diameter D1, and the disk-like outer shape single side 2a. Alternatively, the protrusion 7a or 7b is provided on the same surface as at least one of the other surfaces 2b. At least one protrusion 7a or 7b is formed on the dental prosthetic ceramic body 1, and the protrusion 7a or 7b is a mark indicating the direction of the external shape of the dental prosthetic ceramic body 1.

  The protruding amount of the protruding portion 7a or 7b in the radial direction of the dental prosthetic ceramic body 1 is not less than the protruding amount of the protruding portion 4. The protrusion amount is the protrusion amount in the radial direction of the dental prosthetic ceramic body 1 from the peripheral edges of the one surface 2a and the other surface 2b formed with the diameter D1.

  20 to 22, the protrusions of the protrusions 7 a and 7 b are set to be equivalent to the protrusions of the protrusion 4, and the protrusions 7 a and 7 b and a part of the protrusion 4 are integrated. The form which is continuously formed is shown in FIG.

  Since the protruding portion 7a or 7b is a mark indicating the direction of the outer shape, it is possible to prevent the same appearance shape from appearing along the peripheral direction of the ceramic body 1 for dental prosthesis. When a part of the ceramic body for dental prosthesis 1 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 previous cutting time is Since the dental prosthesis ceramic body 1 is formed, the confirmation of the peripheral direction and the accuracy of positioning are more important.

  Even in such a use situation, in the dental prosthetic ceramic body 1 according to the present invention, the protruding portion 7a or 7b becomes a mark indicating the direction of the outer shape, so that the same appearance shape is prevented from appearing in the peripheral direction. The Therefore, the confirmation and positioning of the peripheral direction of the dental prosthetic ceramic body 1 with respect to the holder are facilitated, and the dental prosthetic ceramic body 1 can be accurately positioned with respect to the holder during cutting.

  In addition, since the said effect should just be acquired by forming the protrusion part 7a or 7b, the width dimension of the protrusion part 7a or 7b shall be formed in the level which can be visually observed.

  The protrusion 7a or 7b can be formed by machining with a machine tool such as an end mill or a machining center of a milling lathe. Or you may form the protrusion part 7a or 7b by press molding simultaneously with the press molding of the convex part 4. FIG.

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

  Alternatively, as shown in FIGS. 23 and 24, the protruding portion 7b need not be formed. That is, the projecting portion 7a may be changed so that only the one surface 2a side is formed with respect to the convex portion 4. By changing in this way, since the protrusion 7a is formed only on the one surface 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 in the peripheral direction, the vertical confirmation and positioning of the dental prosthetic ceramic body 1 with respect to the holder of the CAD / CAM processing apparatus can be facilitated, and the dental prosthesis with respect to the holder during cutting is facilitated. The vertical direction of the ceramic body 1 can also be accurately positioned.

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

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

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

  In this embodiment, the protrusion 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. On the other hand, when viewed from the other surface 2b direction, the projecting portion 7b is formed with a width W2 narrower than the width W1 in the peripheral direction. Furthermore, the difference between the dimensions of the widths W1 and W2 is set to be visible.

  Therefore, according to the configuration of the present embodiment, the external shape of the dental prosthetic ceramic body 1 in the vertical direction is not the same due to the difference in the dimensions of the widths W1 and W2. Therefore, in addition to the confirmation and positioning in the peripheral direction, the vertical verification and positioning of the dental prosthetic ceramic body 1 with respect to the holder of the CAD / CAM processing apparatus can be facilitated, and the dental prosthesis can be applied to the holder during the cutting process. The vertical direction of the ceramic body 1 can also be accurately positioned.

  Note that the shape of the protrusions 7a when viewed from the plane direction and the shape of the protrusions 7b when viewed from the other surface 2b direction need only be different, so the difference between the shapes of the protrusions 7a and 7b is the width W1. It is not limited to the difference of W2.

  Also, the technical elements of FIG. 25 described above can be applied to this embodiment.

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

  The ceramic body 1 for dental prosthesis of the eighth embodiment is different from each of the embodiments described above in that at least one protruding portion 7a is formed in advance and the ceramic body 1 for dental prosthesis is viewed from the plane direction. The other protuberance 7c is formed at a position of less than 180 ° along the peripheral direction of the dental prosthetic ceramic body 1 at the time.

  From FIG. 27, the alternate long and short dash line CL is shown so as to pass through the center of the projecting portion 7a and the center on one side 2a. Therefore, when the protrusion 7a is used as a reference, the 180 ° portion passing through the center on the one surface 2a is a portion 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 protruding portion 7a, the protruding portion 7c is formed at an arbitrary position of less than 180 ° in the counterclockwise peripheral direction in FIG.

  As described above, at least one other protrusion 7c is formed at an arbitrary position of less than 180 ° with reference to one protrusion 7a. Therefore, when the dental prosthesis ceramic body 1 is turned upside down, if any one of the protrusions (for example, the protrusion 7a) is used as a reference, the other protrusion 7c appears in line symmetry 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 external appearance shape of the dental prosthetic ceramic body 1 in the vertical direction does not appear the same. Therefore, in addition to the confirmation and positioning in the peripheral direction, the vertical verification and positioning of the dental prosthetic ceramic body 1 with respect to the holder of the CAD / CAM processing apparatus can be facilitated, and the dental prosthesis can be applied to the holder during the cutting process. The vertical direction of the ceramic body 1 can also be accurately positioned.

  The number of protrusions can be set arbitrarily, but it is necessary to set at least two locations and at any location less than 180 ° to confirm the peripheral and vertical directions of the dental prosthetic ceramic body 1 and to position the holder. From the point of view, it is desirable. Further, four or more protrusions may be provided in the peripheral direction.

  Also, in this embodiment, various technical elements shown in FIG. 25 or FIG. 26 can be applied.

  In the present invention, the direction indicating the direction of the outer shape is not limited to the recesses 3a to 3c, the D-cut surfaces 6a and 6b, and the protruding portions 7a to 7c described in each embodiment, but also depends on the ink. It is assumed that any visible thing such as a mark written above or a mark formed so as not to be erased, such as a ruled line on one side 2a, is included. However, all the marks indicating the direction of the outer shape are provided at locations other than the center on the one surface 2a when viewed from the planar direction.

1 Ceramic body for dental prosthesis
2a single side
2b Other side
3a, 3b, 3c Concave part 4 Convex part 5 Chamfered part
D1 Diameter T Thickness of ceramic body for dental prosthesis
T4 Thickness of convex part
W1 Width of recess or protrusion
W2 Width of recess or protrusion
6a, 6b D-cut surface
7a, 7b, 7c Projection
CL Dash-dot line?

Claims (9)

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

Images