JP2018143393A - Easy coloring dental pre-sintered body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coloring method to a dental pre-sintered body that can make a dental restoration enabling color tone reproduction similar to the natural tooth and further can reproduce a detailed tooth-colored design for solving problems in which a conventional dental restoration cannot perform color tone expression similar to a natural tooth in the light and shade or the strength of color.SOLUTION: A dental pre-sintered body is provided in which cutting work is performed after pre-sintering and it is completely sintered to a state capable of being used in an oral cavity after the cutting work. The dental pre-sintered body is characterized in that the density of the dental pre-sintered body sintered preliminarily is assumed as the preliminary sintering density, and the density of the dental pre-sintered body finally sintered to the density for use in the oral cavity is assumed as the complete sintered density, and then the equation of 30≤relative density (%)={(preliminary sintering density)/(complete sintered density)}×100≤45 is satisfied.SELECTED DRAWING: Figure 4

Description

The present invention relates to a dental temporary sintered body for producing a dental restoration by cutting using CAD / CAM technology, which can be easily colored.

In recent years, dental restorations have been produced by cutting a dental temporary sintered body using CAD / CAM technology and then firing it completely.
The prepared dental restoration is required to be colored in the color of natural teeth, and a technique has been invented for obtaining a dental colored temporary sintered body colored in a stage before complete firing.
In Patent Document 1, in order to obtain a dental restoration colored in the color of natural teeth, a dental colored temporary sintered body is prepared by laminating powder materials colored in a plurality of colors. However, since a plurality of powder materials are used, it may be peeled off from the interface, and complicated coloring cannot be reproduced.
Patent Documents 2 and 3 describe that a cut dental restoration is immersed in a metal ion coloring solution or a metal complex coloring solution and then sintered to produce a translucent colored dental restoration. It is described. However, the penetrating power of the metal ion coloring liquid or the metal complex coloring liquid is weak, and it is difficult to appropriately color the inside.

WO2009 / 154301 Special Table 2002-536280 Special table 2010-534245

A conventional colored dental pre-sintered body is composed of parallel layers colored in the color of a tooth, and a dental restoration cut from the dental pre-sintered body has color shading and Color tone expression similar to that of natural teeth could not be achieved in terms of strength and weakness. Therefore, it has been desired that a dental restoration capable of reproducing a color tone similar to that of natural teeth can be produced. Furthermore, there has been a demand for a method for coloring a dental temporary sintered body that can reproduce a detailed tooth color design.

The dental temporary sintered body of the present invention is a dental temporary sintered body that is subjected to cutting after pre-sintering and is completely sintered until it can be used in the oral cavity after cutting,
The density of the presintered dental temporary sintered body is the presintered density,
When the density of the dental temporary sintered body finally sintered to the density used in the oral cavity is defined as the complete sintered density,
30 ≤ Relative density (%) = {(pre-sintered density) / (fully sintered density)} x 100 ≤ 45
It satisfies the following formula. Preferably
30 ≤ Relative density (%) = {(pre-sintered density) / (fully sintered density)} x 100 ≤ 35
Also,
37 ≤ Relative density (%) = {(pre-sintered density) / (fully sintered density)} x 100 ≤ 40
Is also preferable.
A dental temporary sintered body obtained by pre-sintering inorganic powder after compression molding is preferable. It is preferable that the dental temporary sintered body is finally sintered to the density used in the oral cavity after cutting.
The dental temporary sintered body of the present invention can be produced by pre-baking inorganic powder after compression molding. Examples of the inorganic powder used include ceramics or glass powders such as alumina, zirconia, silica, aluminum nitride, and silicon nitride. Alumina and zirconia are preferred.
Alumina-based and zirconia-based are that alumina or zirconia is 60% to 100% by weight in the inorganic powder composition, preferably 80% to 100%, and more preferably 95% to 100%.
The average particle size of the inorganic powder is 1.0 to 5000 nm. More preferably, it is 30-1000 nm. The inorganic powder may form secondary particles, and the average secondary particle size is 0.01-50 μm.
It is preferable that it is a coloring set for dental temporary sintered bodies with the coloring liquid containing the coloring material used for the dental temporary sintered body, and the penetrating liquid containing the penetrating liquid material. The coloring liquid contains a coloring liquid material and a coloring material. The penetrating liquid is characterized in that it penetrates next to the coloring liquid in order to infiltrate the coloring liquid into the dental temporary sintered body. The dental temporary sintered body is colored by bringing the coloring liquid containing the coloring material and the penetrating liquid containing the penetrating liquid material into contact with the dental temporary sintered body in order.
Coloring can also be performed by sequentially bringing the dental restoration after cutting the dental temporary sintered body into contact with the coloring liquid containing the coloring material and the penetrating liquid containing the penetrating liquid material.

The present invention can reproduce the complex color of the tooth structure inside the dental temporary sintered body, and can freely color in three dimensions. As a result, the dental restoration obtained from the dental temporary sintered body is aesthetically excellent, has high color reproducibility, and is excellent in design.
Compared to the conventional need to have a plurality of dental temporary sintered bodies colored according to the color of a shade guide or the like, the present invention is colored without coloring because the dental temporary sintered body is colored. It is sufficient to have a coloring set for a dental temporary sintered body of a dental temporary sintered body of a kind, a coloring liquid containing a coloring material, and a penetrating liquid containing a penetrating liquid material.
Since the uncolored dental pre-sintered body is individually colored, it can be colored according to the needs of the patient and the needs of the dentist and dental technician. Moreover, since the colored inorganic powder is not divided into layers, the obtained dental temporary sintered body and dental restoration have high physical properties and excellent aesthetics.
Since the dental temporary sintered body of the present invention can reproduce the shade of coloring, it can appropriately reproduce blurring, and the transition portion of the color is not clear, so the aesthetics are higher.

The dental temporary sintered body is a state in which inorganic powders are temporarily attached to each other in order to temporarily calcinate the inorganic powder after compression molding, and a continuous hole through which a colored liquid or a penetrating liquid described later can permeate between the powders. It is in the state which has. A dental temporary sintered body can be obtained by placing an inorganic powder in a mold, compression molding and pre-baking, and can also be obtained by molding using a CIM technique and pre-baking.
A dental colored temporary sintered body can be obtained by infiltrating a coloring material into the dental temporary sintered body. Since it is difficult to infiltrate the colorant directly into the dental temporary sintered body, the colorant and the color liquid material are mixed to form a color liquid. A colored colored sintered body can be obtained by coloring the bonded body. The colored liquid material is removed by vaporization or baking after the penetration of the coloring material.
The dental colored temporary sintered body colored with the dental temporary sintered body is cut into the shape of a dental restoration that is a part of the natural tooth form, and then fired to obtain a final shape dental restoration. Can be obtained. When cutting a dental restoration that is a part of a natural tooth form from a colored pre-sintered dental body, taking into account the shrinkage in the main firing, it expands to a similar shape of the final shape dental restoration The final shape of the dental restoration can be obtained by cutting into a finished shape and firing it. In addition, after the dental colored temporary sintered body is completely fired to obtain a dental sintered body, the final shape of the dental restoration can be obtained by cutting into a final shape of the dental restoration. Furthermore, the dental pre-sintered body is cut into the shape of a dental restoration that is a part of the natural tooth form, and then colored and fired to obtain a final shape dental restoration. You can also.
The calcination temperature and the main calcination temperature vary depending on the composition and particle size of the inorganic powder, but the main calcination temperature is higher by 100 to 600 ° C. than the calcination temperature. The pre-baking temperature preferable for the present invention is 800 to 1500 ° C, and the main baking temperature preferable for the present invention is 1100 to 2100 ° C.
The dental temporary sintered body infiltrated with the coloring liquid containing the coloring material can be temporarily fired once again. By performing the pre-baking again, the colored liquid material can be removed, and the coloring material can be fixed in the dental temporary sintered body.

A dental colored temporary sintered body is prepared by infiltrating a colored liquid containing a coloring material into a dental temporary sintered body, but a dental temporary sintered body is made large and a colored liquid containing a coloring material is infiltrated. It is also possible to cut out the dental colored pre-sintered body after having been made. This is because it is easy to produce a dental colored temporary sintered body in which a coloring liquid containing a coloring material or a penetrating liquid containing a penetrating liquid material uniformly penetrated.
The dental temporary sintered body is a block shape having a side of 0.5 to 3.0 cm or a disk shape having a thickness of 0.7 to 3 cm and a diameter of 5 to 15 cm.

The coloring material is not particularly limited as long as it can color the dental temporary sintered body and can retain the color even if the dental temporary sintered body is infiltrated and fired. Specifically, metals or metal salts of Group 3-12 transition metals in the periodic table can be used as the coloring material. In addition, rare earth metals or their salts can also be used. Metal salts containing oxides or metal salts in oxide form or containing anions such as Cl-, SO4-, SO3-, Br-, F-, NO2- and NO3- may be used. It is preferable to use a mixture of these materials as appropriate.
Specific examples of the coloring material include compounds containing iron, manganese, copper, chromium, zirconium, cobalt, tin, titanium, nickel, vanadium, erbium, praseodymium, terbium, dysprosium, europium, niobium, neodymium and / or ytterbium. Can be mentioned.
The coloring material must penetrate between the inorganic powder in the dental temporary sintered body together with the coloring liquid material that is a constituent of the coloring liquid. Therefore, it is preferable that the colorant is smaller than the average particle size of the inorganic powder. Preferably, the colorant has a size of 1/4 to 1/10000 compared to the average particle size of the inorganic powder. If the average particle diameter of the colorant is large, the penetration into the inorganic powder is suppressed, and if the average particle diameter of the colorant is small, color development is inhibited. The average particle diameter of the specific colorant is 0.1 nm to 10 μm. Further, it is preferable that the solution is ionized in the coloring liquid because it does not cause a physical obstacle for the coloring liquid or the penetrating liquid to penetrate into the dental temporary sintered body.

The coloring liquid material is used as a carrier medium for allowing the coloring material to penetrate into the dental temporary sintered body. The coloring liquid material is not particularly limited as long as the coloring material is dispersed and the wettability to the dental temporary sintered body is high. Specific coloring liquid materials can include water, methanol, ethanol, n-propanol, isopropyl alcohol, acetone, methyl ethyl ketone, and the like. A plurality of these colored liquid materials can be mixed and used as necessary. It preferably contains water, ethanol, isopropyl alcohol and acetone. Most preferred is water.
The coloring liquid is a mixture containing a coloring material and a coloring liquid material, and the blending ratio is 0.0001 to 30% for the coloring material and 70 to 99.9999% for the coloring liquid material. It is preferable to use a plurality of colored liquids having different colors as the colored liquid. By using a plurality of colors, it is possible to realize a rich color reproduction. In order to stably and deeply color the dental temporary sintered body, it is preferable to infiltrate the dental temporary sintered body with the coloring liquid and repeatedly infiltrate the coloring liquid and the penetrating liquid after drying.
The penetrant is a component containing the penetrant material. The penetrating liquid material is preferably the same component as the colored liquid material used for the colored liquid. Although there is a method of immersing a coloring liquid or a penetrating liquid in the dental temporary sintered body, it is preferable to make the dental temporary sintered body penetrate by dripping, and the dripping amount is 0.01 to 0.00001 ml.
Further, the dental temporary sintered body can be colored by being immersed in a specified amount of penetrating liquid or coloring liquid, and further applied. It is preferable to immerse from one end of the dental temporary sintered body.

It is preferable to allow a plurality of coloring liquids and penetrating liquid to penetrate into the dental temporary sintered body. For example, after the color liquid is infiltrated, the color liquid that is different from the colorant is infiltrated, or the color liquid that is different from the colorant is infiltrated adjacent to each other so that the color is different in the dental temporary sintered body. The part can be reproduced freely and rich color expression can be achieved. By impregnating the penetrating liquid into the portion that is not colored, the portion that is not colored can also be reproduced. By coloring the dental temporary sintered body using a plurality of colored liquids having different colorants, the color tone can be reproduced.
Specifically, in order to reproduce mamelon in the dental pre-sintered body, the colored liquid is applied and penetrated into the shape of the mammelon, but the permeated liquid is applied and penetrated into the portion where the colored liquid is not desired to penetrate. , It is possible to prevent the colored liquid from entering the portion that is not desired to be colored. In this way, the mamelon can be reproduced by using the coloring liquid and the penetrating liquid.

The method of finely penetrating the coloring liquid and the penetrating liquid in order to express rich colors is to fill the nozzle with the coloring liquid or penetrating liquid, generate droplets from the tip, and then fly it to the dental temporary sintered body. A method of penetrating and coloring the presintered body for use is preferred. This method is an ink jet method, and by adopting this method, it is possible to color three-dimensionally like a photograph.

Next, a specific description will be given.
The dental temporary sintered body is obtained by compressing and molding a zirconia powder having an average particle diameter of 40 nm into a 15 mm square column shape and calcining it, thereby obtaining a temporary density of 25, 30, 35, 37, 40, 50% relative density. A sintered body was produced. The coloring liquid was prepared by dispersing iron oxide in water at a blending ratio of 3 × 10 ⁻³ g / dm ³ . Hereinafter, it is called iron oxide coloring liquid.
The iron oxide coloring liquid is dropped 0.1 to 0.00001 ml at a time on the dental presintered body to give a thickness of 1 mm, and 0.1 to 0.00001 ml of the penetrating liquid prepared from water is added on the colored body. It was dripped and the iron oxide coloring liquid was osmose | permeated inside. When the iron oxide coloring liquid penetrated 5 mm, the dropping of the penetrating liquid was terminated.
The dental colored temporary sintered body was dried at 80 to 220 ° C. for 1 to 3 hours to obtain a dental colored temporary sintered body. Since the coloring liquid and the penetrating liquid may move during drying, the coloring must be performed while calculating.
Since the coloring material can move freely inside the dental temporary sintered body by adjusting the dropping position and the dropping amount of the coloring liquid or by dropping together with the penetrating liquid, the inside is also designed with a coloring material. A colored pre-sintered body or a dental sintered body can be obtained.
Since the coloring liquids and the coloring liquid and the penetrating liquid are mixed with each other by contact to form a gradation, a blurring effect can be described, so that the color of the natural tooth can be reproduced. The gradation can be easily formed by first dropping the penetrating solution and then dropping the coloring solution. When coloring so as not to cause gradation or blurring between colored liquids or between colored liquid and penetrating liquid, it should be realized by using a material that separates the colored liquid material used in the colored liquid or penetrating liquid without mixing each other. Can do.
A dental temporary sintered body with a relative density of 25, 30, 35, 37, 40, 50% was prepared and carried out. The dental temporary sintered body with a relative density of 25% was slightly weaker and could be transported. On the other hand, it was found that a dental pre-sintered body having a relative density of 50% has a slower permeability and a longer coloring time than the relative densities of 30, 35, 37, and 40%. A material having a relative density of 30 and 35% is preferable because it penetrates more easily than 37 and 40%. Further, those having a relative density of 37 and 40% are stronger than those of 30 and 35%, and are preferable from the viewpoint of conveyance and the like.
As for coloring, there is a method of drying the dental temporary sintered body after coloring and coloring it again, in addition to the method of increasing the coloring liquid, when it is desired to darken the coloring liquid.
Furthermore, the timing of coloring can be colored with a coloring liquid containing a coloring material and a penetrating liquid containing a penetrating liquid material after the dental temporary sintered body is cut into a shape similar to that of a dental restoration. The dental restoration can be colored.

Next, the case where the coloring liquid or the penetrating liquid is colored by immersion will be described using the schematic diagram shown in the drawing.
FIG. 1A shows a dental temporary sintered body, and is a schematic view showing the dental temporary sintered body placed on a chalet containing an iron oxide coloring liquid.
FIG. 2 is a schematic view showing a state in which the iron oxide coloring liquid has penetrated into the dental temporary sintered body in FIG. The part B is a part where the iron oxide coloring liquid penetrates, and the part A is a part where the coloring liquid does not penetrate, forming two layers. Further, the portion B can be thickened by infiltrating the iron oxide coloring liquid.
FIG. 3 is a schematic view showing a portion of the dental temporary sintered body shown in FIG. 2 in which the iron oxide coloring liquid penetrates is placed on the chalet containing the penetration liquid.
FIG. 4 is a schematic view showing a state in which the penetrant has penetrated into the dental temporary sintered body in FIG. The part C is a part in which the penetrating liquid has permeated, the part B is a part in which the iron oxide coloring liquid has permeated, and the part A is a part in which the coloring liquid has not permeated. Further, the portion C can be thickened by infiltrating the permeating liquid. Here, the colored liquid is immersed in a layered manner, but by simultaneously immersing the iron oxide colored liquid and the penetrating liquid, a portion colored with iron oxide and a portion not colored can be obtained.
By using a colored liquid prepared in another color, it is possible to easily color in another color.

(Sample preparation)
Inorganic powders of 97% zirconia and 3% yttria were compression-molded into blocks to prepare dental temporary sintered bodies having relative densities of 25, 30, 35, 57, 40, and 50%. Thereafter, it was cut and formed into a disk shape having a diameter of 1.5 mm and a length of 2.5 mm. A colored liquid in which iron oxide having an average particle diameter of 1 μm was dispersed in water was prepared. Water was used as the osmotic liquid material, and the content of the osmotic liquid material was 100%.
(Test method)
Exam 1:
The dental temporary sintered body was immersed in a petri dish containing 2 cc of the coloring liquid, and the coloring liquid was infiltrated. Thereafter, the dental pre-sintered body was immersed in a petri dish containing 3 cc of water to infiltrate the permeating solution. Thereafter, it was dried, cut into a crown shape, which was the shape of a dental restoration, and then fired at 1450 ° C. for 12 hours.
Test 2:
After cutting the dental temporary sintered body into a crown shape, which is the shape of a dental restoration, 0.5 cc of a coloring liquid was applied to the dental restoration, and the coloring liquid was infiltrated. After penetration, 0.5 cc of water was applied to the dental restoration and the dental restoration was infiltrated with the penetrant. Thereafter, it was dried and baked at 1450 ° C. for 12 hours.
(Evaluation method)
Transport test of temporary dental sintered body:
The dental pre-sintered body was wrapped with a sponge, placed in a paper box, and transported through Japan, the United States, and Japan, and the damage situation was confirmed. Evaluation was made with 1 indicating no damage at all, 2 having chipped corners, and 3 having large damage.
Coloring test:
The coloring liquid and penetrating liquid were evaluated for degree of coloring. Evaluation was performed according to the following evaluation criteria.
20 minutes after starting to penetrate or apply to the dental pre-sintered body, it is evaluated as 1 when both the coloring liquid and the penetrating liquid penetrate deeply, 3 when shallowly penetrated, and 2 when neither deep nor deeply penetrated. did. The case where the penetration portion of the permeated colored liquid and the penetrating liquid is in the range of 0.5 to 1.0 cm in the length direction of the dental temporary sintered body is defined as not being shallow or deep.

When the dental temporary sintered body having a relative density of Comparative Examples 1 and 3 of 25% is transported, there is a high possibility that problems such as large breakage will occur.
When the relative density of Comparative Examples 2 and 4 is 50%, there is a problem in the permeation performance of the coloring material, and it takes time for coloring.
When transporting a dental temporary sintered body in which the relative density of Examples 1, 2, 5 and 6 is 30-35%, problems such as partial breakage may occur, but sufficient This can be avoided by using packaging materials. There is no problem with coloring.
When the relative density of Examples 3, 4, 7, and 8 is 37 to 40%, there may be a problem in coloring, but this is within the range that can be used clinically. There is no problem in the transportation test.

Next, an embodiment of a workpiece for dental CADCAM according to the present invention will be described.
There are no particular limitations on the material of the dental CADCAM workpiece to be used in the present invention, and any material such as a resin material, an inorganic material, or a composite material can be used. The resin material is preferably an acrylic resin material, the inorganic material is a ceramic material, specifically aluminosilicate glass, zirconia, or alumina, and the composite material is preferably a material obtained by mixing an acrylic resin material with inorganic powder. Can be used.
A particularly preferable raw material for the dental CADCAM workpiece is an unsintered or final sintered ceramic material. In this case, the ceramic material preferably contains 95% or more of alumina or zirconia, and the primary average particle size of the ceramic material is preferably 0.01 to 10 μm.

The dental CADCAM workpiece to be cut according to the present invention is a molded body for engraving a dental restoration using CADCAM technology. The material is placed in a mold, pressed by pressing, and cured by heating. It is obtained by prefiring. The to-be-cut object for dental CADCAM has a substantially cylindrical shape, and can have a diameter of 5-15 cm and a height of 0.7-3.0 cm, for example.
The dental CADCAM workpiece to be cut according to the present invention may have a single-color single-layer structure, or may be manufactured by overlapping and molding layers having different color tones, and in this case, a 2- to 8-layer structure is formed. be able to. Among these, it is preferable to be composed of at least three layers of enamel color, dentin color, and tooth neck color.

The to-be-cut object for dental CADCAM of the present invention has at least one concave portion in the circumferential portion. The recess does not extend over the entire circumference of the circumferential portion of the dental CADCAM workpiece, and is a portion that engages with the CADCAM device when the dental CADCAM workpiece is installed in the CADCAM device.
The concave portion of the circumferential portion of the dental CADCAM workpiece to be cut according to the present invention has a substantially cylindrical shape when the dental CADCAM workpiece is viewed from the top surface or the bottom surface. The center angle is preferably formed over a range of 330 degrees or more and less than 360 degrees with the center of gravity at the center. When the central angle is 330 degrees or less, the CAM where the dental CADCAM workpiece is placed and the portion where the dental CADCAM workpiece is in contact are reduced, and the burden on the contact portion is increased, resulting in a stable installation. May be inhibited. It is preferable that the concave portion of the circumferential portion provided in the body to be cut formed with a central angle over a range of 330 degrees or more is formed continuously.
Further, when the dental CADCAM workpiece is viewed from the top surface or the bottom surface, the circumferential surface of the arc portion where the concave portion is not formed in the circumferential portion of the substantially cylindrical dental CADCAM workpiece. The upper length is preferably 1-20 mm. If the length of the circular arc portion in which the substantially concave cylindrical concave portion is not formed is 1 mm or less, the circular arc portion in which the concave portion is not formed is easily damaged. If the length on the circumferential surface of the circular arc portion in which the substantially concave cylindrical concave portion is not formed is 20 mm or more, it becomes difficult to determine the positional relationship in the circular arc portion in which the concave portion is not formed, and it makes contact with the CAM. The portion is reduced and the stable fixing is hindered, and the substantially cylindrical recess is easily damaged.

The concave portion of the circumferential portion preferably has a dimension in the axial direction of the dental CADCAM workpiece to be cut within the range of 1 to 5 mm, from the circumferential surface to the central axis (the dental CADCAM workpiece to be cut on the top side or The dimension (dimension in the radial direction) toward the center of gravity (center axis) when viewed from the bottom side is preferably 1-5 mm. If it falls below these ranges, the arc portion tends to break, and if it exceeds these ranges, stable attachment to the CAM device may be hindered.
The shape of the concave portion of the circumferential portion is preferably an “L” shape when the dental CADCAM workpiece is cut along a plane including the central axis. In this case, as long as the concave portion is present, the dental CADCAM workpiece is preferably “L” -shaped even if it is cut along any surface including the central axis. The “L” shape is preferably composed of a plane parallel to the central axis and a plane perpendicular to the central axis. Stable attachment to the CAM device is possible, and it is possible to engage without loosening.

Next, specific embodiments of the present invention will be described with reference to the drawings.
FIG. 5 is a drawing (plan view) of the dental CADCAM workpiece 1 of the present embodiment as viewed from the top surface 1a or bottom surface 1b direction of a substantially cylindrical shape. The dental CADCAM workpiece 1 has a pair of recesses 2 and 3 in the circumferential portion (side surface) 1c, and the pair of recesses 2 and 3 does not extend over the entire circumference of the circumferential portion 1c. An arc portion 4 that is not a concave portion is provided in the upper part of FIG. In the present embodiment, the recess 2 is opened on the top surface 1 a of the CADCAM workpiece 1, and the recess 3 is opened on the bottom 1 b of the CADCAM workpiece 1. However, you may provide the recessed parts 2 and 3 so that it may not open to a top | upper surface and a bottom face. The recesses 2 and 3 are portions that engage the CADCAM device.
FIG. 6 is a view of the dental CADCAM workpiece 1 of this embodiment as viewed from the side of the substantially circular column (circumferential portion 1c) on the arc portion 4 side that is not a recess. As shown in FIG. 6, the dental CADCAM workpiece 1 has recesses 2 and 3 in a circumferential portion 1c. In FIG. 6, the recessed part 2 or the recessed part 3 which was not shown in FIG. 5 is shown. As shown in FIG. 6, the recesses 2 and 3 do not extend over the entire circumference of the circumferential portion 1c, and the dental CADCAM workpiece 1 has a circular arc portion 4 that is not a recess in the center of FIG. Have. Thus, the dental CADCAM workpiece 1 of the present embodiment has the arc portion 4 that is not a recess so as not to extend over the entire circumference of the circumferential portion 1c. Therefore, in the dental CADCAM workpiece 1 of the present embodiment, the pair of recesses 2 and 3 do not extend over the entire circumference of the circumferential portion 1c.
In the dental CADCAM workpiece 1 of this embodiment, the circumferential positioning is possible by the partial arc 4 that is not a recess extending over the entire circumference of the circumferential portion 1c.

7 and 8 are diagrams in which auxiliary lines and the like are added to the drawings of FIGS. 5 and 6 in order to explain dimensions and the like in the dental CADCAM workpiece 1 of the present embodiment.
As shown in FIG. 7, the concave portions 2 and 3 of the present embodiment have a substantially cylindrical shape for CADCADAM to be cut when the dental CADCAM workpiece 1 is viewed from the top surface 1a side or the bottom surface 1b side. With the center of gravity (center) CG of the body 1 as the center, the center angle θ is continuously formed over a range of 330 degrees to less than 360 degrees. In the present embodiment, the recesses 2 and 3 are formed in the same range around the center of gravity (center) CG when the dental CADCAM workpiece 1 is viewed from the top surface 1a side or the bottom surface 1b side. .
Moreover, in this embodiment, the length (circumferential direction) of the circular arc part 4 in which the recessed part 2 and 3 in the circumferential part 1c of the to-be-cut body 1 for dental CADCAM having a substantially cylindrical shape are not formed. The distance L between one end and the other end of the recess is 1-20 mm.
In the present embodiment, the dimensions 2h and 3h of the concave portions 2 and 3 of the circumferential portion 1c in the axial direction AX of the dental CADCAM workpiece 1 are in the range of 1-5 mm. In the present embodiment, the dimension 2h in the axial direction AX of the recess 2 and the dimension 3h in the axial direction AX of the recess 3 have the same dimension. However, the dimension 2h in the axial direction AX of the recess 2 and the dimension 3h in the axial direction AX of the recess 3 may be different.
In addition, the recesses 2 and 3 of the present embodiment have a central axis (center) CG axis when the dental CADCAM workpiece 1 is viewed from the top surface 1b side or the bottom surface 1c side from the circumferential surface 1c. ) The dimension (diameter dimension) 2w and 3w toward CX are both in the range of 1-5 mm. In the present embodiment, the dimension 2w from the circumferential surface 1c of the recess 2 toward the central axis CX and the dimension 3w from the circumferential surface 1c of the recess 3 toward the central axis CX have the same dimensions, but are different from each other. It may be a dimension.
In addition, the dental CADCAM workpiece 1 of the present embodiment can have a substantially cylindrical diameter D in the range of 5-15 cm and a height H in the range of 0.7-3.0 cm.

The dental CADCAM workpiece 1 of the present embodiment is composed of three layers of an enamel color layer, a dentin color layer, and a tooth neck color layer, and the recess 2 has an enamel color. The concave portion 3 is formed over the entire axial direction AX of the layer having the cervical color. Furthermore, in the present embodiment, the layer having the enamel color, the layer having the dentin color, and the layer having the tooth neck color are set to have the same dimension in the axial direction AX of the dental CADCAM workpiece 1. It is configured.

Moreover, as shown in FIG. 8, the recessed parts 2 and 3 of this embodiment are the case where the to-be-cut object 1 for dental CADCAM is cut | disconnected along the surface containing the central axis CX of the to-be-cut object 1 for dental CADCAM. In addition, it is formed to have an “L” shape. In particular, in the present embodiment, the dental CADCAM workpiece 1 has a shape that is “L” -shaped even if it is cut along any surface including the central axis CX, as long as the concave portion exists. doing. Specifically, the recesses 2 and 3 are composed of a surface 2a or 3a parallel to the central axis CX and surfaces 2b and 3b perpendicular to the central axis CX.

FIG. 9 shows a conventional dental CADCAM workpiece, and is a plan view seen from the top or bottom direction of a substantially cylindrical shape. It can be seen that the conventional dental CADCAM workpiece has a recess in the circumferential portion and has this recess over the entire circumference.
FIG. 10 is a side view of a conventional dental CADCAM workpiece cut from the side surface direction of a substantially circular cylinder. It can be seen that a conventional dental CADCAM workpiece has two recesses in the circumferential portion and has these recesses over the entire circumference.

FIG. 11: is the side view which looked at the to-be-cut object 1 for dental CADCAM of the 2nd Embodiment of this invention from the side surface direction of the substantially cylinder by the side of the circular arc part 4 which is not a recessed part. In this embodiment, when the dental CADCAM workpiece 1 is viewed from the top surface 1a side or the bottom surface 1b side, the concave portion 2 is formed in a wider range with the center of gravity (center) CG as the center than the concave portion 3. This is different from the embodiment of FIG. In this way, by making the shape of the recess 2 different from the shape of the recess 3, the directionality in the axial direction AX of the dental CADCAM workpiece 1 can be confirmed, and the dental restoration is cut. It can be installed more easily so that the dental restoration can be further cut from the rest of the body.
In addition, as an aspect which makes the shape of the recessed part 2 and the shape of the recessed part 3 differ, the aspect which makes the dimension of the recessed part in the axial direction of the to-be-cut object 1 for dental CADCAM mutually differ, for example, the to-be-cut object 1 for dental CADCAM The aspect which makes the dimension of the recessed part which goes to the central axis CX differ from each other, the aspect which makes the shape of the recessed part different from each other when cut along the surface including the central axis CX of the workpiece 1 for dental CADCAM (for example, “L”) Character shape and arc shape).

FIG. 12 is a side view of the dental CADCAM workpiece 1 according to the third embodiment of the present invention as viewed from the side of the substantially circular column on the arc portion 4 side that is not a recess. The dental CADCAM workpiece 1 of this embodiment has only a recess 2 that opens in the top surface 1a of the CADCAM workpiece 1 and a recess 3 that opens in the bottom 1b of the CADCAM workpiece 1. 5 is different from the embodiment of FIG. Thus, also by providing the concave portion 2 only on the top surface 1a (or the bottom surface 1b), the directionality in the axial direction AX of the dental CADCAM workpiece 1 can be confirmed, and the dental restoration is cut. It can be installed more easily so that the dental restoration can be further cut from the remainder of the workpiece.

FIG. 13: is the side view which looked at the to-be-cut object 1 for dental CADCAM of the 4th Embodiment of this invention from the side surface direction of the substantially cylinder by the side of the circular arc part 4 which is not a recessed part. The dental CADCAM workpiece 1 of this embodiment differs from the embodiment of FIG. 5 in that it has only a recess 5 that does not open on either the top surface 1a or the bottom surface 1b of the CADCAM workpiece 1. ing. In particular, in this embodiment, the recessed part 5 is formed over the whole axial direction AX of the layer which has a dentin color sandwiched between the layer which has an enamel color and the layer which has a tooth neck part color.

The configuration of the invention of the above embodiment can be described, for example, as follows, but is not limited to these descriptions.
(1) In a dental CADCAM workpiece to be mounted on a CADCAM device to produce a dental restoration, the dental CADCAM workpiece is substantially cylindrical.
The circumferential portion of the dental CADCAM workpiece is provided with at least one concave portion, and the concave portion does not extend over the entire circumference of the circumferential portion of the dental CADCAM workpiece,
A dental CADCAM workpiece, wherein a concave portion of the dental CADCAM workpiece is engaged with a CADCAM device.

(2) The dental CADCAM workpiece to be cut according to (1), wherein the dental CADCAM workpiece has one concave portion for each of a substantially cylindrical top surface and bottom surface.

(3) In the dental CADCAM workpiece as described in (1) above, the concave portion of the circumferential portion has a substantially cylindrical shape when the dental CADCAM workpiece is viewed from the top or bottom side. A center angle is formed over a range of 330 degrees or more and less than 360 degrees with the center of gravity of the CADCAD workpiece to be cut as a center, and a concave portion is formed in the circumferential portion of the substantially CAD-shaped dental CADCAM workpiece. A cut object for dental CADCAM, wherein the length of the circular arc portion on the circumferential surface is 1-20 mm.

(4) In the dental CADCAM workpiece as described in (1) above, the axial dimension of the dental CADCAM workpiece in the concave portion of the circumferential portion is in the range of 1-5 mm. The dental CADCAM workpiece is characterized in that the dimension toward the central axis of the CADCAM workpiece for use is in the range of 1-5 mm.

(5) The dental CADCAM workpiece according to (1), wherein the cylindrical CADCAM workpiece has a substantially cylindrical diameter of 5-15 cm and a height of 0.7-3.0 cm.

(6) The dental CADCAM workpiece to be cut according to (1), wherein the dental CADCAM workpiece is an unsintered or final sintered ceramic material.

(7) A dental CADCAM workpiece to be cut according to (6), wherein the dental CADCAM workpiece is a ceramic material containing 95% or more of an alumina or zirconia component.

(8) A dental CADCAM workpiece, wherein the dental CADCAM workpiece according to (6) is a ceramic material having a primary average particle size of 0.01 to 10 μm.

(9) The dental CADCAM workpiece to be cut according to (1), wherein the dental CADCAM workpiece has a portion that is not a concave portion that does not extend over the entire circumference in which circumferential positioning is possible.

Even if the dental temporary sintered body of the present invention is a dental temporary sintered body before cutting or a dental restoration after cutting, a colored liquid or a penetrating liquid penetrates. It is easy to color and color complex colors up to the inside. This makes it possible to produce a dental restoration that can reproduce a color tone similar to that of natural teeth, and to obtain a dental restoration that is aesthetically superior than before.

Schematic diagram before penetrating iron oxide coloring liquid into dental temporary sintered body Schematic diagram showing the state in which the iron oxide coloring liquid has penetrated into the dental temporary sintered body Schematic diagram before further penetrating the penetrating liquid into the part where the iron oxide coloring liquid penetrated Schematic diagram showing the state where the penetrant has penetrated into the dental temporary sintered body The top view of the to-be-cut object for dental CADCAM of the 1st Embodiment of this invention The side view of the to-be-cut object for dental CADCAM of the 1st Embodiment of this invention The top view which added the auxiliary line etc. to the to-be-cut object for dental CADCAM of this invention The side view which added the auxiliary line etc. to the to-be-cut object for dental CADCAM of this invention Plan view of conventional dental CADCAM workpiece Side view of a conventional dental CADCAM workpiece Side view of the object to be cut for dental CADCAM according to the second embodiment of the present invention. The side view of the to-be-cut object for dental CADCAM of the 3rd Embodiment of this invention. The side view of the to-be-cut object for dental CADCAM of the 4th Embodiment of this invention

A Dental pre-sintered body that is not infiltrated with coloring liquid B Dental pre-sintered body that is infiltrated with iron oxide coloring liquid C Dental pre-sintered body that is infiltrated with permeating liquid 1 Dental CADCAM workpiece 1a Surface 1b Bottom surface 1c Circumferential portion 2 Recess 2a Surface 2b Surface 3 Recess 3a Surface 3b Surface 4 Arc portion 5 which is not a recess 5 Recess AX Axial direction CG Center of gravity (center)
CX center axis

Claims (4)

Cutting is performed after pre-sintering, a dental temporary sintered body that is sintered to a state that can be used in the oral cavity after cutting,
The density of the presintered dental temporary sintered body is the presintered density,
When the density of the dental sintered body sintered to the density used in the oral cavity is the complete sintered density,
30 ≤ Relative density (%) = {(pre-sintered density) / (fully sintered density)} x 100 ≤ 45
A dental temporary sintered body satisfying the following formula: The dental temporary sintered body, wherein the average particle diameter of the inorganic powder constituting the dental temporary sintered body according to claim 1 is 1.0 to 5000 nm. A coloring set for a dental temporary sintered body comprising a coloring liquid containing a coloring material for coloring the dental temporary sintered body according to claim 1 and an infiltrating liquid containing an infiltrating liquid material,
A coloring set for a dental temporary sintered body, wherein the coloring liquid contains metal ions. 2. A coloring method for coloring a dental temporary sintered body according to claim 1 by bringing a coloring liquid containing a coloring material into contact with a penetrating liquid containing a penetrating liquid material.

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