Demonstration kit for dentistry

Abstract

To provide a demonstration kit for dentistry which can easily evaluate the compatibility of color tones of restoration materials for dentistry.SOLUTION: The demonstration kit for dentistry includes at least two artificial teeth for restoration with missing parts and at least one prosthesis material formed of a restoration material for dentistry. The missing parts of the at least two artificial teeth for restoration are each a removal part (W) to which a prosthesis material can be attached or from which a prosthesis material can be removed. The prosthesis material has a removal part (Z) which can be attached to the artificial teeth for restoration or can be removed from the artificial teeth for restoration in a surface facing the removal part (W). The prosthesis material has a shape which can be engaged with the removal part (W) in the removal part (Z). A plurality of restoration samples formed by engaging the prosthesis material and the artificial teeth for restoration with each other are different from each other.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a dental demonstration kit. [Background technology]

[0002] Dental hardenable compositions comprising a polymerizable monomer, an inorganic filler and a polymerization initiator are widely used as materials for repairing missing teeth or cavities. Before the advent of dental composite resins, amalgams and gold alloys were used as dental hardenable compositions for filling caries, but in recent years, due to improvements in the mechanical strength of dental restorative materials and their adhesive strength to teeth, they are used not only for anterior teeth but also for molars, which are subject to high occlusal pressure, and currently, most filling treatments are performed using dental restorative materials. As dental restorative materials, dental composite resins or dental mill blanks are used.

[0003] Dental composite resin is a type of material used in dental treatment to repair teeth damaged by caries or fractures when there is only a small amount of decay. It has rapidly become popular because it is inexpensive and can be used relatively easily to achieve a color close to that of natural teeth. Restorations using dental composite resins are called direct restorations, and are rapidly gaining popularity because they require less removal of tooth structure, can achieve a color tone similar to natural tooth color, and are easy to use. Moreover, in recent years, due to improvements in mechanical strength and adhesive strength with teeth, dental composite resins are used not only for restoring anterior teeth, but also for molar teeth, which are subjected to high occlusal pressure.

[0004] On the other hand, if there is a lot of carious area, a large amount of tooth substance will be removed, and it will be difficult and complicated to build up dental composite resin into the defect created during dental treatment. Therefore, indirect restorations such as ceramic inlays / onlays, metal inlays / onlays, and CAD / CAM inlays / onlays are chosen. In recent years, CAD / CAM systems have become widespread among indirect restorations, in which prosthetic devices such as inlays and onlays are designed by computer and then cut using a milling device to produce them. Dental mill blanks are used as the cutting material in these CAD / CAM systems. Dental restorative materials produced from dental mill blanks have sufficient mechanical strength to replace natural teeth.

[0005] In recent years, there has been an increasing demand for dental restorative materials, including dental composite resins and dental mill blanks, to provide highly aesthetic restorations that resemble natural teeth. To perform highly aesthetic restorative treatment, it is necessary to determine the color (hue and tone) of the tooth to be restored (tooth to be restored) (sometimes called "shade taking") and select a dental restorative material of a color that matches the determined color. In this case, restoration is often performed using a dental restorative material of one color, but when performing highly aesthetic restoration that faithfully reproduces color variations depending on the part of the tooth, restoration may be performed by layering multiple dental restorative materials of different colors.

[0006] The shade taking is generally performed using a color sample called a shade guide. There are various shade guides, each designed to make the color judgment easier by changing the number of color samples and the configuration of the device for holding the color samples. The shade guide consists of samples of 16 colors (indices consisting of a combination of hue and mixed indices of lightness and saturation, or indices taking into account hue, lightness, and saturation. Hereinafter, colors specified by such indices will be referred to as "shades"). The most widely used is the "Vita Classical Shade Guide (product name)" made by VITA Corporation, which can determine the color of the restored tooth part in the oral cavity by comparing the shade guide with the color of the restored tooth part and the surrounding teeth (Patent Document 1). Dental restorative materials are also often available in all 16 shades listed above.

[0007] The shade guide is also used as a method for checking the shade of dental restorative materials. Since dental restorative materials have subtle differences in color depending on the type, manufacturer, and lot, even if they are the same shade, a method is adopted in which a shade guide is used for each dental restorative material to distinguish the shade of the dental restorative material in order to perform accurate shade taking.

[0008] Meanwhile, in recent years, dental composite resins have been developed that can restore a wide range of colors of restored teeth with an appearance close to that of natural teeth using one type of dental composite resin, without the need for cumbersome shade taking or selection of the shade of the composite resin. For example, when a prosthesis made of a hardened dental composite resin and a dental mill blank is measured against a white background using a spectrophotometer, it has been found that the spectral reflectance is almost constant in a certain range of wavelengths, and therefore the prosthesis made of the hardened dental composite resin and the dental mill blank exhibits good color compatibility (hereinafter, sometimes simply referred to as "color compatibility") with natural teeth of a wide range of colors (Patent Document 2). This allows for highly aesthetic direct restorations that match the surrounding tooth structure to the point that they are indistinguishable from natural teeth. In particular, for cases where a cavity floor exists, such as Class I / II / V cases, a dental restorative material of one shade shows good color matching with a wide range of natural tooth shades.

[0009] A demonstration tool has been developed to understand the properties of dental composite resins that exhibit color matching (Patent Document 3). This has enabled us to understand the excellent feature of dental composite resins, which is their excellent color matching for a wide range of colors. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] Patent No. 6004769 [Patent Document 2] International Publication No. 2022 / 092193 [Patent Document 3] Patent No. 6840394 Summary of the Invention [Problem to be solved by the invention]

[0011] As shown in Patent Document 2, dental restorative materials that show higher color matching than before have been developed in recent years, but when using a shade guide, since the shade guide is flat, when assuming clinical use in which a prosthesis obtained by processing the dental restorative material is applied to a defect, the dental restorative material cannot exhibit the characteristic of color matching that transmits and reflects the surrounding color due to the absence of a tooth substance with a defect to which it is to be applied. Therefore, the characteristics of dental composite resins that show color matching cannot be visually understood.

[0012] In addition, in the demonstration instrument for direct restoration disclosed in Patent Document 3, the composite resin (hardenable composition) before hardening is filled into the defect and polymerized and hardened to integrate the prosthesis and the artificial tooth for restoration, so the prosthesis obtained by hardening after filling also adheres to the wall of the defect, making it difficult to remove the prosthesis. Therefore, the color compatibility that can be confirmed with the demonstration instrument is limited to only one time.

[0013] In this case, by preparing multiple restorative artificial teeth, it is possible to compare a dental composite resin that does not have color compatibility with a dental composite resin that has color compatibility, and understand the color compatibility of the dental composite resin that shows color compatibility. However, since this demonstration instrument is used to fill a dental composite resin composition into a defect in an artificial tooth for restoration and then harden it, it was found that it cannot be used in indirect restoration methods that use prostheses that are polymerized and hardened to the desired shape before being filled into the defect. Therefore, with regard to dental composite resins, which have color compatibility, i.e., dental restorative materials that transmit and reflect the colors of their surroundings and can be adapted to a wide range of colors, the change in color before and after application to the defect area was not visually understood. For the reasons described above, Patent Document 3 does not at all suggest a demonstration instrument that can easily evaluate the color compatibility of dental restorative materials in the indirect restoration method.

[0014] Therefore, an object of the present invention is to provide a dental demonstration kit that allows easy evaluation of the color tone of dental restorative materials. [Means for solving the problem]

[0015] As a result of extensive research, the inventors have discovered that the above-mentioned problems can be solved by using a dental demonstration kit consisting of two or more restorative artificial teeth with missing portions formed therein and one or more prostheses made from dental restorative materials, wherein the prostheses and the restorative artificial teeth have detachable parts, and have thus completed the present invention.

[0016] That is, the present invention includes the following inventions. [1] Two or more restorative artificial teeth having missing parts and one or more prostheses made of dental restorative materials; each of the missing portions of the two or more artificial teeth for restoration is a detachable portion (W) to which the prosthesis can be attached and detached; the prosthesis has a detachable part (Z) that is detachably attached to the artificial tooth for restoration on a surface facing the detachable part (W); The prosthesis has a shape that can be fitted into the detachable part (W) at the detachable part (Z), A dental demonstration kit comprising a plurality of different restoration samples each formed by fitting the prosthesis and the artificial tooth for restoration. [2] The dental demonstration kit described in [1], wherein the plurality of restoration samples are composed of any of the following (i), (ii) or (iii). (i) two or more of the restorative teeth have different shades; or (ii) two or more of the restorative teeth have the same shade and the kit includes two or more prostheses having different shades; or (iii) two or more of the restorative teeth have the same shade, and the kit includes two or more prosthetic appliances having the same color tone. [3] A dental demonstration kit as described in [2], which satisfies condition (i) or (ii) and in which the shapes of the missing parts of the two or more restorative artificial teeth are identical or substantially identical. [4] A dental demonstration kit as described in [2], which satisfies condition (i) or (iii) and in which the shapes of the missing portions of the two or more restorative artificial teeth are different. [5] A dental demonstration kit according to any one of [2] to [4], which satisfies the condition (i) and the shade of the restorative artificial tooth is two or more types selected from the group consisting of A1, A2, A3, A3.5, A4, B1, B2, B3, B4, C1, C2, C3, C4, D2, D3, and D4. [6] The dental demonstration kit according to any one of [1] to [5], further comprising an application agent. [7] The dental demonstration kit described in [6], wherein the coating agent contains a polymerization initiator and the content of the polymerization initiator is 1000 ppm by mass or less. [8] The dental demonstration kit described in [6] or [7], wherein the coating agent contains a polymerizable monomer and the content of the polymerizable monomer is 10,000 ppm by mass or less. [9] The dental demonstration kit according to any one of [6] to [8], wherein the transparency of the application agent is ΔL10 or more.

[10] The dental demonstration kit described in [6], wherein the application agent is a dental color matching confirmation material or water.

[11] A dental demonstration kit as described in

[10] , wherein the L*a*b* color system of the dental color matching confirmation material is within the following range. L* / w=70.0~110.0, a* / w=-5.0~15.0, and b* / w=-5.0~40.0

[12] A dental demonstration kit according to any one of [1] to

[11] , consisting only of a restorative artificial tooth having the detachable part (W) and a prosthesis having the detachable part (Z).

[13] The dental demonstration kit according to any one of [1] to

[12] , wherein the dental restorative material is a dental mill blank or a dental composite resin.

[14] The dental demonstration kit according to any one of [1] to

[13] , wherein the missing portion of the artificial tooth for restoration is a class II cavity.

[15] A method for evaluating the color of a dental restorative material, comprising: [1] -

[14] The dental demonstration kit according to any one of the above, a step of preparing a first restoration sample by fitting a detachable part (W-1) of a first restoration artificial tooth with a detachable part (Z) of the prosthesis; removing said prosthesis from a first restoration sample; a step of preparing a second restoration sample by fitting a detachable portion (W-2) of a second restoration artificial tooth with a detachable portion (Z) of the prosthesis; and comparing the color of the first repair sample to the color of the second repair sample; Methods for assessing the color of dental restorative materials.

[16] The evaluation method described in

[15] , wherein in a dental demonstration kit, two or more of the restorative artificial teeth have different shades from each other.

[17] The evaluation method according to

[15] or

[16] , in which the detachable portion (W-1) and the detachable portion (Z) and / or the detachable portion (W-2) and the detachable portion (Z) are engaged with each other via an application agent. Effect of the Invention

[0017] According to the present invention, a dental demonstration kit that allows easy evaluation of the color tone of a dental restorative material can be provided. Furthermore, according to the present invention, a dental demonstration kit can be provided that allows easy evaluation of the color compatibility of dental restorative materials. Furthermore, according to the present invention, by repeatedly attaching and removing a prosthesis made of a dental restorative material, the color of the prosthesis can be repeatedly confirmed before and after application to a defect in a restorative artificial tooth. Therefore, in the indirect restoration method, the color compatibility of the dental restorative material, which transmits and reflects the surrounding colors and can be adapted to a wide range of color tones, can be easily and repeatedly visually confirmed. [Brief description of the drawings]

[0018] [Figure 1] This shows the morphological classification of the missing part of an artificial tooth for restoration. [Diagram 2] 1 illustrates one embodiment of a dental demonstration kit according to the present invention. [Diagram 3] 1 is a photograph of one prosthesis and one corresponding artificial restorative tooth used in a dental demonstration kit according to the present invention. [Figure 4] 1 is a photograph of a restoration sample obtained when using a dental demonstration kit according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] The present invention will be described in detail below. In this specification, the upper and lower limits of numerical ranges (contents of each component, values ​​calculated from each component, and each physical property, etc.) can be appropriately combined. In this specification, "color compatibility" means a property whereby, when a prosthesis made of a dental restorative material is attached to an application target such as an artificial tooth for restoration or tooth structure, the prosthesis gradually takes in and absorbs the color tone of the application target, and the absorbed color tone is perceived by the observer's vision, so that the color tone of the prosthesis appears to change gradually at the boundary between the application target and the prosthesis, and can be adapted to a wide range of color tones of the application target. In other words, "color compatibility" refers to a property where, when the prosthesis is fitted to the application target, the color of the prosthesis changes in accordance with the color tone of the application target, or appears to have changed visually. In this specification, the "defective portion" may include cavities included in the GVBlack classification shown in various cavities (class I to class V cavities) in Figures 1A to 1E, cavities not included in the GVBlack classification, or defects of other shapes. The "defective portion" corresponds to a detachable portion (W) to which a prosthesis can be attached and detached. In this specification, the term "restoration sample" refers to a sample obtained by attaching a detachable part (Z) of a prosthesis made from a dental restorative material to a defective part (detachable part (W)) of a restorative artificial tooth having a defective part, as shown in FIG. 4, for example. In addition, in this specification, "shade" means a color specified by an index consisting of a combination of hue and a mixed index of lightness and saturation, or a color specified by an index taking into account hue, lightness and saturation, and means a symbol in the "Vita Classical Shade Guide" manufactured by VITA Corporation.

[0020] The dental demonstration kit of the present invention includes two or more artificial teeth for restoring having a missing part, and one or more prostheses made of a dental restorative material, Each of the two or more artificial teeth for restoration has a detachable portion (W) to which the prosthesis can be attached and detached, the prosthesis has a detachable part (Z) that is detachably attached to the artificial tooth for restoration on a surface facing the detachable part (W); The prosthesis has a shape that can be fitted into the detachable part (W) at the detachable part (Z), A plurality of restoration samples each formed by fitting the prosthesis and the artificial tooth for restoration are different from one another. By "the multiple repaired samples are different from one another" it is meant that the appearance, including the color tone, of the two or more repaired samples is different.

[0021] In the demonstration kit of the present invention, when a prosthesis is attached to a restorative artificial tooth, the prosthesis gradually absorbs and absorbs the color of the restorative artificial tooth, and the color of the boundary between the restorative artificial tooth and the prosthesis is reflected in the observer's visual sense so that the color of the boundary between the restorative artificial tooth and the prosthesis changes gradually. Therefore, if the observer cannot visually perceive the above-mentioned color change, it can be said that the prosthesis made of dental restorative materials does not have color compatibility. Furthermore, when a prosthesis with color compatibility is used, when the prosthesis is removed, the absorption of the color of the restorative artificial tooth gradually disappears, and the prosthesis begins to absorb indoor light, and when it is removed and placed on a desk, it will show the color of the prosthesis on the desk. By removing and attaching such a prosthesis, the color changes from before insertion to when insertion occurs, when removal occurs, and after removal, which is thought to make it easier to understand the color tone (preferably, the color compatibility) of the prosthesis and the restorative artificial teeth. Furthermore, if a prosthesis made from a dental restorative material does not have color compatibility, the observer cannot visually perceive the above-mentioned color change. Therefore, by comparing the color change with that when a prosthesis made from a dental restorative material has color compatibility, it is possible to easily evaluate and recognize that the dental restorative material does not have color compatibility. Therefore, with the demonstration kit of the present invention, it is possible to easily evaluate whether a prosthesis made of a dental restorative material has color compatibility.

[0022] In the dental demonstration kit of the present invention, it is preferable that the multiple restoration samples are configured as any one of the following (i), (ii) or (iii) so that the multiple restoration samples are different from each other. (i) two or more of the restorative teeth have different shades; (ii) two or more of the restorative teeth have the same shade and the kit includes two or more prostheses having different shades; or (iii) two or more of the restorative teeth have the same shade, and the kit includes two or more prosthetic appliances having the same color tone. The dental demonstration kit of the present invention, in which condition (i) two or more of the artificial restorative teeth have different shades, is referred to as a "first embodiment". In addition, as a dental demonstration kit of the present invention, the case where condition (ii) that two or more of the restorative artificial teeth have the same shade and the kit includes two or more prostheses having different color tones is referred to as the "second embodiment." Furthermore, the case where condition (ii) that the two or more artificial restorative teeth have the same shade and the kit includes two or more prostheses having the same color tone is referred to as a "third embodiment". In the dental demonstration kit of the present invention, the following applies to all embodiments, except when the "first embodiment", "second embodiment" or "third embodiment" is specifically described.

[0023] <Dental restorative materials> There are no particular limitations on the dental restorative material contained in the dental demonstration kit of the present invention, and various dental materials can be used. Specifically, various resin materials (dental composite resins such as composite resins for filling caries cavities, composite resins for abutment construction, and composite resins for crowns; denture base resins), denture base lining materials, impression materials, resin cements, bonding materials such as resin-added glass ionomer cements, dental fissure sealants, dental mill blanks, temporary crowns, artificial tooth materials, etc. can be used. Among these, the dental restorative material of the present invention is preferably a resin material because it has high aesthetics and excellent mechanical strength, more preferably a resin material having an inorganic filler content of 50 mass% or more, and even more preferably a dental mill blank or a dental composite resin.

[0024] [Dental Mill Blanks] The dental mill blank according to the present invention is not particularly limited, and may be a commercially available one or may have a known composition. For example, the composition of the dental mill blank may include a polymerizable monomer (A), a polymerization initiator (B), an inorganic filler (C), and a colorant (D).

[0025] The polymerizable monomer (A) used in the dental mill blank of the present invention is not particularly limited, and any known polymerizable monomer used in dental hardenable compositions can be used, with radically polymerizable monomers being particularly preferred. The radical polymerizable monomer is preferably an ester of an unsaturated carboxylic acid or a (meth)acrylamide derivative, more preferably a (meth)acrylic acid ester or a (meth)acrylamide derivative, and further preferably a (meth)acrylic acid ester. The polymerizable monomer (A) may be used alone or in combination of two or more kinds. In this specification, the term "(meth)acrylic" is used to include both methacryl and acrylic. Also, the term "(meth)acrylic monomer" is used to include both (meth)acrylic acid esters and (meth)acrylamide derivatives. Examples of (meth)acrylic acid esters and (meth)acrylamide derivatives are shown below.

[0026] Monofunctional (meth)acrylic acid esters and (meth)acrylamide derivatives For example, methyl (meth)acrylate, isobutyl (meth)acrylate, benzyl (meth)acrylate, dodecyl (meth)acrylate, 2-(N,N-dimethylamino)ethyl (meth)acrylate, 2,3-dibromopropyl (meth)acrylate, 3-(meth)acryloyloxypropyltrimethoxysilane, 11-(meth)acryloyloxyundecyltrimethoxysilane, 2-hydroxyethyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate. , 10-hydroxydecyl (meth)acrylate, propylene glycol mono(meth)acrylate, glycerin mono(meth)acrylate, erythritol mono(meth)acrylate, phenoxyethylene glycol (meth)acrylate, isobornyl (meth)acrylate, 3-phenoxybenzyl (meth)acrylate, N-methylol (meth)acrylamide, N-hydroxyethyl (meth)acrylamide, N,N-bis(hydroxyethyl) (meth)acrylamide, N,N-dimethyl (meth)acrylamide, N,N-diethyl (meth)acrylamide, N,N-di-n-propyl(meth)acrylamide, N-ethyl-N-methyl(meth)acrylamide, (meth)acryloylmorpholine, (meth)acryloyloxydodecylpyridinium bromide, (meth)acryloyloxydodecylpyridinium chloride, (meth)acryloyloxyhexadecylpyridinium bromide, (meth)acryloyloxyhexadecylpyridinium chloride, ethoxylated-o-phenylphenol(meth)acrylate, ethoxylated-m-phenylphenol(meth)acrylate, ethoxylated-p-phenylphenol(meth) Examples of the acrylate include propoxylated o-phenylphenol (meth)acrylate, propoxylated m-phenylphenol (meth)acrylate, propoxylated p-phenylphenol (meth)acrylate, o-phenoxybenzyl (meth)acrylate, m-phenoxybenzyl (meth)acrylate, p-phenoxybenzyl (meth)acrylate, 2-(o-phenoxyphenyl)ethyl (meth)acrylate, 2-(m-phenoxyphenyl)ethyl (meth)acrylate, and 2-(p-phenoxyphenyl)ethyl (meth)acrylate.

[0027] Bifunctional (meth)acrylic acid esters For example, aromatic bifunctional (meth)acrylic esters and aliphatic bifunctional (meth)acrylic esters are included.

[0028] Examples of aromatic bifunctional (meth)acrylic acid esters include 2,2-bis((meth)acryloyloxyphenyl)propane, 2,2-bis[4-(3-acryloyloxy-2-hydroxypropoxy)phenyl]propane, 2,2-bis[4-(3-methacryloyloxy-2-hydroxypropoxy)phenyl]propane (commonly known as Bis-GMA), 2,2-bis(4-(meth)acryloyloxypolyethoxyphenyl)propane, 2-(4-(meth)acryloyloxydiethoxyphenyl)-2-(4-(meth)acryloyloxyethoxyphenyl)propane, 2-(4-(meth)acryloyloxydiethoxyphenyl)-2-(4-(meth)acryloyloxytriethoxyphenyl)propane, 2,2- Examples of the acryloyloxypropoxyphenyl include bis(4-(meth)acryloyloxypropoxyphenyl)propane, 2,2-bis(4-(meth)acryloyloxyisopropoxyphenyl)propane, 2,2-bis(4-(meth)acryloyloxydipropoxyphenyl)propane, 2-(4-(meth)acryloyloxydipropoxyphenyl)-2-(4-(meth)acryloyloxytriethoxyphenyl)propane, 9,9-bis[4-(2-(meth)acryloyloxyethoxy)phenyl]fluorene, 9,9-bis[4-(2-(meth)acryloyloxypolyethoxy)phenyl]fluorene, diphenylbis[3-(meth)acryloyloxypropyl]silane, and methylphenylbis[3-(meth)acryloyloxypropyl]silane.

[0029] Examples of the aliphatic difunctional (meth)acrylic acid esters include glycerol di(meth)acrylate, ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, triethylene glycol diacrylate, triethylene glycol dimethacrylate (commonly known as 3G), propylene glycol di(meth)acrylate, butylene glycol di(meth)acrylate, neopentyl glycol di(meth)acrylate, 1,3-butanediol di(meth)acrylate, 1,5-pentanediol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, and the like. tert-acrylate, 1,10-decanediol di(meth)acrylate, 1,12-dodecanediol di(meth)acrylate, 1,2-bis(3-(meth)acryloyloxy-2-hydroxypropyloxy)ethane, tricyclodecane dimethanol di(meth)acrylate, 2,2,4-trimethylhexamethylene bis(2-carbamoyloxyethyl)diacrylate, 2,2,4-trimethylhexamethylene bis(2-carbamoyloxyethyl)dimethacrylate (commonly known as UDMA), dicyclohexyl bis[3-(meth)acryloyloxypropyl]silane, and the like.

[0030] Among the above-mentioned bifunctional (meth)acrylic acid esters, from the viewpoint of improving the mechanical strength of the obtained cured product, 2,2-bis[4-(3-acryloyloxy-2-hydroxypropoxy)phenyl]propane, 2,2-bis[4-(2-hydroxy-3-methacryloyloxypropoxy)phenyl]propane (Bis-GMA), 2,2-bis(4-(meth)acryloyloxypolyethoxyphenyl)propane (average number of moles of ethyleneoxy groups added: 1 to 30), triethylene glycol diacrylate, etc. are preferred. acrylate, triethylene glycol dimethacrylate (3G), 1,10-decanediol di(meth)acrylate, 1,12-dodecanediol di(meth)acrylate, 1,2-bis(3-(meth)acryloyloxy-2-hydroxypropyloxy)ethane, tricyclodecane dimethanol di(meth)acrylate, 2,2,4-trimethylhexamethylenebis(2-carbamoyloxyethyl)diacrylate, 2,2,4-trimethylhexamethylenebis(2-carbamoyloxyethyl)dimethacrylate More preferred are 2,2-bis[4-(3-methacryloyloxy-2-hydroxypropoxy)phenyl]propane (Bis-GMA), 2,2-bis(4-methacryloyloxypolyethoxyphenyl)propane (average number of moles of ethyleneoxy groups added: 1 to 30), triethylene glycol dimethacrylate (3G), 1,10-decanediol dimethacrylate, 1,12-dodecanediol dimethacrylate, 1,2-bis(3-methacryloyloxy-2-hydroxypropyloxy)phenyl)propane, and more preferred are 2,2-bis[4-(3-methacryloyloxy-2-hydroxypropoxy)phenyl]propane (Bis-GMA), 2,2-bis(4-methacryloyloxypolyethoxyphenyl)propane (average number of moles of ethyleneoxy groups added: 1 to 30), triethylene glycol dimethacrylate (3G), 1,10-decanediol dimethacrylate, 1,12-dodecanediol dimethacrylate, 1,2-bis(3-methacryloyloxy-2-hydroxypropyloxy)phenyl)propane, )ethane, tricyclodecane dimethanol dimethacrylate, and 2,2,4-trimethylhexamethylene bis(2-carbamoyloxyethyl) dimethacrylate (UDMA) are more preferred, and 2,2-bis[4-(2-hydroxy-3-methacryloyloxypropoxy)phenyl]propane (Bis-GMA), 2,2-bis(4-methacryloyloxypolyethoxyphenyl)propane (average number of moles added of ethyleneoxy groups: 2.6), and triethylene glycol dimethacrylate (3G) are particularly preferred.

[0031] Trifunctional or higher (meth)acrylic acid esters For example, trimethylolpropane tri(meth)acrylate, trimethylolethane tri(meth)acrylate, trimethylolmethane tri(meth)acrylate, pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, dipentaerythritol tri(meth)acrylate, dipentaerythritol tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, N,N'-(2,2,4-trimethylhexamethylene)bis[2-(aminocarboxy)propane-1,3-diol]tetra(meth)acrylate, 1,7-di(meth)acryloyloxy-2,2,6,6-tetra(meth)acryloyloxymethyl-4-oxaheptane, and the like can be mentioned.

[0032] In addition, as the polymerizable monomer (A), oligomers and polymers having a radically polymerizable group such as a (meth)acrylic acid ester group can also be suitably used. For example, the polymerizable prepolymers described in JP-A-50-42696, the unsaturated urethane oligomers described in JP-A-2011-144121, the polyfunctional acrylate compounds described in JP-A-2006-510583, and the prepolymers described in WO2020 / 122192 can be used.

[0033] The polymerization initiator (B) used in the dental mill blank of the present invention is not particularly limited, and can be selected from polymerization initiators used in general industry, among which polymerization initiators used for dental purposes are preferred. As the polymerization initiator (B), a photopolymerization initiator and a chemical polymerization initiator are particularly preferred. The polymerization initiator (B) may be used alone or in appropriate combination of two or more kinds.

[0034] The inorganic filler (C) used in the dental mill blank of the present invention is not particularly limited, and may contain various glasses and silica as main components, and may contain oxides of heavy metals, boron, aluminum, etc., as necessary. The inorganic filler (C) may be used alone or in combination of two or more kinds. In this specification, the term "main component" refers to the component that is present in the greatest amount. The content of the main component may be 20% by mass or more, 30% by mass or more, 40% by mass or more, 50% by mass or more, 60% by mass or more, or 70% by mass or more.

[0035] The coloring agent (D) used in the dental mill blank of the present invention is not particularly limited, and any inorganic pigment and / or organic pigment can be used without limitation depending on the color tone of the dental mill blank to be desired. The coloring agent (D) may be used alone or in combination of two or more kinds.

[0036] If the inorganic filler (C) used in the dental mill blank of the present invention is surface-treated in advance with a known silane compound such as a silane coupling agent, its affinity with the polymerizable monomer can be adjusted, thereby obtaining a composition that is easy to handle as a dental material. As the silane compound, any known silane compound can be used without any limitation.

[0037] The manufacturing method of the dental mill blank according to the present invention is not particularly limited, and may be manufactured by a known manufacturing method.Specifically, the method includes a step of contacting the inorganic filler molding obtained by pressing an inorganic filler with a polymerizable monomer-containing composition, and polymerizing and curing the polymerizable monomer, because the dental mill blank having desired physical properties can be obtained more efficiently. Also, it can be obtained by blending and mixing each component in a predetermined content. There is no particular limitation on the blending order, and each component may be blended all at once or in two or more batches. Also, they may be mixed or kneaded as necessary, or may be subjected to a degassing treatment such as vacuum degassing treatment. The dental hardenable composition obtained is filled into a single container, and a method including a step of polymerizing and hardening it is exemplified.

[0038] [Dental composite resin] The dental composite resin according to the present invention is not particularly limited, and may be a commercially available one or may have a known composition. For example, the composition of the dental composite resin may include a polymerizable monomer (A), a polymerization initiator (B), an inorganic filler (C), and a colorant (D).

[0039] The polymerizable monomer (A) used in the dental composite resin of the present invention is not particularly limited, and any polymerizable monomer known to be used in dental hardenable compositions can be used, with radically polymerizable monomers being particularly preferred. As the polymerizable monomer (A) used in the dental composite resin, the above-mentioned examples of the polymerizable monomer (A) used in the dental mill blank may be used.

[0040] The polymerization initiator (B) used in the dental composite resin of the present invention is not particularly limited, and can be selected from polymerization initiators used in general industry, and among them, polymerization initiators used for dental purposes are preferred. As the polymerization initiator (B), a photopolymerization initiator and a chemical polymerization initiator are particularly preferred. The polymerization initiator (B) may be used alone or in appropriate combination of two or more kinds.

[0041] The inorganic filler (C) used in the dental composite resin of the present invention is not particularly limited, and may contain various glasses and silica as main components, and may contain oxides of heavy metals, boron, aluminum, etc., as necessary. The inorganic filler (C) may be used alone or in combination of two or more kinds.

[0042] There is no particular limitation on the colorant (D) used in the dental composite resin of the present invention, and either an inorganic pigment and / or an organic pigment can be used without limitation depending on the desired color tone of the dental composite resin.

[0043] When the inorganic filler (C) of the dental composite resin of the present invention is used after surface treatment with a known silane compound such as a silane coupling agent, the affinity with the polymerizable monomer can be adjusted, and a composition with excellent handling properties as a dental material can be obtained. As the silane compound, any known silane compound can be used without any restrictions.

[0044] The method for producing the dental composite resin according to the present invention is not particularly limited, and it can be produced by a known production method. Specifically, it can be produced by blending and mixing each component in a predetermined content. There is no particular limit to the order of blending, and each component may be blended at once or in two or more batches. If necessary, they may be mixed or kneaded, or may be subjected to a degassing treatment such as a vacuum degassing treatment. The obtained dental composite resin composition can be filled into a single container (such as a syringe) to form a one-material (one-paste) dental composite resin.

[0045] In an embodiment, the dental demonstration kit of the present invention can be used to evaluate the presence or absence of color matching when it is unclear whether or not there is color matching. The first embodiment or the third embodiment can be used to evaluate the presence or absence of color matching. In another embodiment, the dental demonstration kit of the present invention can be used to highlight the color matching of a prosthesis when it is known that the prosthesis has the color matching. The first embodiment, the second embodiment, or the third embodiment can be used to highlight the color matching. In the case where a prosthesis is known to have color matching and the purpose is to visually emphasize the color matching, for example, a dental demonstration kit in which the dental restorative material used as the material for the prosthesis is a dental hardenable composition having color matching is preferably used. As described above, the dental hardenable composition that is the material for the prosthesis used in the dental demonstration kit of the present invention can be used even when color compatibility is unknown, and can be selected according to the purpose of use, so there is no particular limitation.

[0046] Examples of dental hardenable compositions that can be used as materials for prostheses in embodiments used to enhance the color matching of the prosthesis are given below. The dental curable composition having color compatibility is not particularly limited as long as it has color compatibility, but examples thereof include compositions described in International Publication No. 2022-092193. Specifically, the dental hardenable composition having color matching properties is a dental hardenable composition comprising a polymerizable monomer (A), a filler (B), a polymerization initiator (C), and a colorant (D), The ratio R of the spectral reflectance at wavelengths of 650 nm, 700 nm, and 750 nm to the spectral reflectance at a wavelength of 600 nm when a 1.0 mm-thick cured product of the dental hardenable composition is measured against a white background using a spectrophotometer 650 / 600 , R 700 / 600 , and R 750 / 600 In the dental hardenable composition, each of the above is within the range of 97% to 103%.

[0047] The ratio of the spectral reflectances can be evaluated by placing a standard white plate behind a 1 mm-thick cured product of the dental hardenable composition and measuring the spectral reflectance for wavelengths of 380 to 780 nm using a spectrocolorimeter (SE6000, manufactured by Nippon Denshoku Industries Co., Ltd., light source: D65 / 2, measurement window: φ6 mm). In the dental hardenable composition having the above-mentioned color tone compatibility, the contrast ratio of a 1.0 mm-thick hardened product thereof, defined by the following formula (1), preferably satisfies 0.35 to 0.65. Contrast ratio=Y b / Y w (1) (where Y b represents the Y value of the XYZ color system measured against a black background, and Y w represents the Y value of the XYZ color system measured against a white background.) The contrast ratio can be calculated by measuring the tristimulus value Y of a 1 mm-thick cured product of a dental curable composition on a black background and a white background using a spectrophotometer. Furthermore, in the dental curable composition having color tone compatibility, it is preferable that the light diffusion index LD of a cured product having a thickness of 0.25 mm, defined by the following formula (2), satisfies 0.0001 to 0.99. LD = (I5 / cos5°) / I0(2) The light diffusion degree LD can be calculated by preparing a cured product of the dental curable composition having a diameter of 30 mm and a thickness of 0.25 mm, measuring the luminous intensity distribution of the transmitted light from the cured product at an angle of -90° to +90° using a goniophotometer (GP-200, Murakami Color Research Laboratory Co., Ltd.) at an incident light angle of 0°, and calculating the light diffusion degree LD according to formula (2).

[0048] As the polymerizable monomer (A) used in the dental hardenable composition having color matching, the above-mentioned examples of the polymerizable monomer (A) used in the dental mill blank may be used. The inorganic filler (C) used in the dental curable composition having color matching preferably contains inorganic fine particles (inorganic primary particles) having an average particle size of 0.05 to 1 μm, more preferably contains inorganic fine particles having an average particle size of 0.08 to 0.9 μm, and even more preferably contains inorganic fine particles having an average particle size of 0.1 to 0.8 μm. The inorganic filler (C) used in the dental curable composition having color matching preferably contains inorganic aggregate particles formed by agglomeration of the inorganic primary particles. The average particle size of the inorganic filler (C) can be determined by a laser diffraction scattering method or by electron microscopy of the particles. The laser diffraction scattering method can be measured, for example, by a laser diffraction particle size distribution measuring device (such as "SALD-2300" manufactured by Shimadzu Corporation) using ethanol or a 0.2% aqueous solution of sodium hexametaphosphate as a dispersion medium on a volume basis. The laser diffraction scattering method is particularly convenient for measuring particle sizes of 0.1 μm or more. For electron microscopy observation, a scanning electron microscope (SU3500, SU3800, S-4000, etc. manufactured by Hitachi High-Technologies Corporation) can be used. Specifically, for example, electron microscopy observation can be performed by taking an electron micrograph of the particles and measuring the particle sizes of the particles (200 or more) observed within a unit field of view of the photograph using image analysis particle size distribution measuring software (Mac-View (manufactured by Mountec Co., Ltd.)). Furthermore, the specific surface area of ​​the inorganic agglomerated particles is 10 m 2 / g or more, and 15m 2 / g or more is more preferable, and 18m 2 More preferably, it is 20m 2 It is particularly preferable that the specific surface area of ​​the inorganic agglomerated particles is 300 m 2 / g or less, and 2 / g or less is more preferable, and 200m 2 / g or less is more preferable, 2 / g or less is particularly preferable, and 170m 2 / g or less, and even 150m 2 / g or less. The specific surface area of ​​the inorganic agglomerated particles can be determined by the BET method, for example, using a specific surface area measuring device (such as the "BELSORP-mini" series manufactured by Microtrack-Bell Corporation). There are no particular limitations on the method for producing the dental hardenable composition having the color matching property, and it can be produced by a known production method, similar to the production method for the dental composite resin. The production method described in International Publication No. 2022-092193 can also be used.

[0049] <Prosthetics> The prosthesis of the present invention is not particularly limited, and can be made from various dental restorative materials. Specific examples of the prosthesis of the present invention that can be used include those made from hardened products of various resin materials (dental composite resins such as composite resins for filling dental cavities, composite resins for abutment construction, and composite resins for crowns; denture base resins), hardened products of denture base lining materials, hardened products of impression materials, hardened products of bonding materials such as resin cements and resin-added glass ionomer cements, hardened products of dental fissure sealants, dental mill blanks machined using a CAD / CAM system, temporary crowns machined, and artificial tooth materials machined. Of these, the prosthesis of the present invention is preferably made from a resin material, since it has high aesthetics and excellent mechanical strength, and is more preferably made from a resin material containing 50 mass% inorganic filler, and even more preferably is a product machined from a dental mill blank using a CAD / CAM system, or a hardened dental composite resin.

[0050] The dental demonstration kit of the present invention includes one or more of the above-described prostheses. By including one or more prostheses having a shape that can fit into the missing part of the restorative artificial tooth (detachable part (W)), the prosthesis can be attached to the missing part of the restorative artificial tooth to form a restoration sample, and the color compatibility of the prosthesis can be easily evaluated. The number of prostheses contained in the dental demonstration kit of the present invention is preferably 1 to 10, more preferably 1 to 8, and even more preferably 1 to 5, from the viewpoints of ease of use during observation, ease of comparison of the colors of each prosthesis, and ease of handling. In the first embodiment, by attaching it to artificial restorative teeth having different shades, it matches the color tone of any artificial restorative tooth, and color compatibility can be easily confirmed.

[0051] The shape of the prosthesis is not particularly limited as long as it has a shape that can be fitted into the defective portion of the artificial tooth for restoration. Specifically, the prosthesis has a detachable portion (Z) that can be attached and detached to the artificial tooth for restoration on the surface facing the detachable portion (W) when the prosthesis is fitted into the missing portion of the artificial tooth for restoration.

[0052] The detachable portion (Z) of the prosthesis can be produced by machining (cutting and / or grinding, etc.) so that it can be fitted into the missing portion of the artificial tooth for restoration. The machining method is not particularly limited, and any known method can be used. For machining, commercially available dental CAD / CAM machines, polishing equipment, etc. can be used. The prosthesis can be produced, for example, by using a scanner to obtain structural information about the missing part of the restorative artificial tooth that will be fitted into the prosthesis, and then, based on the obtained scan data, cutting the prosthesis using a CAD / CAM machine so that it can fit into the missing part, and polishing it as necessary. In addition, a gap may be provided between the detachable portion (W) of the artificial restorative tooth and the detachable portion (Z) of the prosthesis so that the prosthesis can be easily removed after being fitted into the missing portion (detachable portion (W)) of the artificial restorative tooth. By applying the coating agent described below to the gap, it becomes easier to see a transitional change in color at the boundary between the artificial tooth for restoration and the prosthesis, making it easier to emphasize that the prosthesis has a color match. For example, in Figs. 1A to 1E, in a defective portion 20 of an artificial tooth for restoration 10, a coating agent may be applied to the gap 10 (or the wall surface 10 of the defective portion). The gap can be measured as the thickness of the coating.

[0053] As described above, the shape of the prosthesis only needs to have a detachable part (Z) that can be attached and detached to the restorative artificial tooth on the surface facing the detachable part (W), and there are no particular restrictions on the shape and size of the occlusal surface of the prosthesis (the surface opposite to the surface facing the detachable part (W) of the restorative artificial tooth). However, from the viewpoint of being able to restore the occlusal surface to its original shape and observe it, it is preferable that it be the same as the shape and size of the original occlusal surface of the restorative artificial tooth before the defect was formed.

[0054] There is no particular restriction on the surface quality of the occlusal surface of the prosthesis, but from the viewpoint of simulating indirect restorations using inlays / onlays in general dental treatment, it is preferable that the surface quality be achieved by cutting using a dental CAD / CAM system. If necessary, cutting and polishing to the desired surface quality may be performed using a carbide bur, diamond bur, or abrasive brush / buff.

[0055] There is no particular limitation on the shade of the prosthesis, but since it is made from a dental restorative material, the shade will be due to the shade of the dental restorative material. In order to reproduce a simulated indirect restoration that is closer to reality, it is preferable to use a shade that is used for general dental restorative materials.

[0056] When the number of the prostheses is two or more, there are no particular restrictions on the shape and size of the prostheses. However, from the viewpoint of suitability for comparison, it is preferable that the size of each prosthesis is within the range of 90 to 100% identical in terms of volume ratio between the prostheses. When observing prostheses being compared with each other, it is easier to observe accurate color tones if they are the same volume, so it is more preferable that the volume ratio is within the range of 93 to 100% identical, and even more preferable that the volume ratio is within the range of 95 to 100% identical.

[0057] There are no particular restrictions on the colors of the prostheses when there are two or more prostheses, but the colors can be appropriately determined for each embodiment so as to facilitate visual comparison depending on the purpose of evaluating (determining) the presence or absence of color compatibility or emphasizing known color compatibility. For example, when two or more prostheses made of dental restorative material are used and the two or more restorative artificial teeth are of different shades, it is preferable that the prostheses be of the same color and type, since they can be compared side-by-side in a simultaneous fitted state in different shades, eliminating the need to change the prostheses and making it easier to emphasize color compatibility. In addition, when two or more prostheses made of dental restorative materials are used and the shades of the two or more restorative artificial teeth are different, it is preferable that the types of prostheses are different in terms of evaluating the presence or absence of color compatibility. In the first embodiment, in order to obtain the effect of emphasizing color matching, the prosthesis may include two or more prostheses made of dental restorative material, and the two or more restorative artificial teeth may have different shades and different shapes of the missing portions.

[0058] <Restoration artificial teeth> The material and internal structure of the restorative artificial teeth included in the dental demonstration kit of the present invention are not particularly limited, but it is preferable to use one having an internal structure similar to that of natural teeth and a multi-layer structure including a dentin layer and an enamel layer, etc., from the viewpoint of realizing a more precise evaluation of color compatibility. In addition, in cases where a dentist or other person with no experience in using dental restorative materials with color matching is asked to perform a mock indirect restoration to check the results, it is more preferable to use acrylic resin teeth from a cost standpoint.

[0059] The restorative artificial teeth may be anterior teeth, molar teeth or other teeth, but from the viewpoint of suitable comparison, it is preferable that the shapes and sizes of the restorative artificial teeth to be compared with each other are uniform. The size (thickness, height, and width) of the artificial restorative tooth is preferably the same or substantially the same as that of the natural tooth, from the viewpoint of enabling a more precise evaluation of color matching. Substantially the same size as a natural tooth means that the thickness, height, and width of the natural tooth are within ±3.0 mm. The size (thickness, height, and width) of the restorative artificial tooth can be set, as necessary, to within ±2.0 mm, ±1.5 m, ±1.0 mm, ±1.0 mm, ±0.5 m, etc. of the thickness, height, and width of the natural tooth. The thickness, height, and width of a restorative artificial tooth being substantially the same as the thickness, height, and width of a natural tooth means that the difference between the thickness, height, and width of a natural tooth and the thickness, height, and width of a restorative artificial tooth is less than 10%, preferably less than 5%, more preferably less than 3%, and even more preferably less than 1%. The phrase "different" for the missing parts of two or more restorative artificial teeth means that the missing parts are different beyond the range of "substantially the same" as described above, and is not particularly limited as long as they are different in thickness, height, or width. In addition, even if the thickness, height, and width are the same, the missing parts of two or more restorative artificial teeth can be said to be different if the positions and / or the number of missing parts are different.

[0060] There are no particular limitations on the shape and size of the missing part of the artificial tooth for restoration, but from the viewpoint of suitability for comparison, it is preferable that the volume ratio between the missing parts of the artificial tooth for restoration being compared with each other is within the range of 90 to 100% identical. When observing restorative artificial teeth being compared with each other, it is easier to observe accurate color tones if they are the same volume, so it is more preferable that the volume ratio is within the range of 93 to 100% identical, and even more preferable that the volume ratio is within the range of 95 to 100% identical. A preferred embodiment includes a dental demonstration kit in which the shapes of the defective portions of a plurality of restorative artificial teeth are the same or substantially the same. As described above, the shape of the defect parts of a plurality of artificial restorative teeth being substantially the same means that the shape and size of the defect parts are within the range of 90 to 100% identical in terms of volume ratio. The number of missing parts of the artificial tooth for restoration is not limited as long as the prosthesis can be fitted into the removable part (Z) on the surface facing the removable part (W) of the artificial tooth for restoration, and may be one or more. In a preferred embodiment, the number of missing parts of the artificial tooth for restoration is one. The number of missing teeth in the restorative artificial teeth can vary depending on the number of prosthetic appliances included in the dental demonstration kit.

[0061] The shape of the defect in the restorative artificial tooth can be appropriately selected depending on the purpose, but is preferably selected from the general defect shape classifications of Class I to Class V cavities. Fig. 1 shows the classification of cavity shapes. Fig. 1A shows a restorative artificial tooth 30 having a Class I cavity. Fig. 1B shows a restorative artificial tooth 30 having a Class II cavity. Fig. 1C shows a restorative artificial tooth 30 having a Class III cavity. Fig. 1D shows a restorative artificial tooth 30 having a Class IV cavity. Fig. 1E shows a restorative artificial tooth 30 having a Class V cavity. In a preferred embodiment, from the viewpoint of simulating treatment in general dental treatment, the defect is preferably a defect limited to a pit or fissure or a defect including the proximal surface of a tooth, more preferably a defect including the proximal surface of an anterior tooth or molar, and even more preferably a Class II cavity.

[0062] The position, size, etc. of the defect portion in the artificial tooth for restoration can be appropriately determined depending on the purpose. For example, in a Class II OD cavity (Occlusal Distal Cavity), when the artificial restorative tooth of the dental demonstration kit of the present invention is placed on a horizontal surface with its bottom surface (cervical side) facing down, the cavity is preferably formed so as to have a concave shape measuring 1 to 10 mm in length, 1 to 10 mm in width, and 1 to 5 mm in depth from the center or approximately the center when the occlusal surface of the artificial restorative tooth is viewed from directly above, and more preferably 2 to 6 mm in length, 2 to 6 mm in width, and 2 to 4 mm in depth. Furthermore, in a Class II MOD cavity, when the restorative artificial tooth of the demonstration kit of the present invention is placed on a horizontal surface with its bottom side facing down, when the occlusal surface of the restorative artificial tooth is viewed from directly above, it is preferable that the recess be formed so that it is 10 to 15 mm long, 1 to 10 mm wide, and 1 to 5 mm deep from one side of the marginal portion to the opposite side of the marginal portion, and it is even more preferable that the recess be 10 to 13 mm long, 2 to 6 mm wide, and 2 to 4 mm deep.

[0063] The number of restorative artificial teeth included in the dental demonstration kit of the present invention is preferably 2 to 10, more preferably 2 to 8, and even more preferably 2 to 5, from the viewpoints of ease of use during observation, ease of comparison of the colors of each prosthesis, and ease of handling.

[0064] There are no particular limitations on the material of the artificial tooth for restoration, and various dental materials can be used. Specific examples of materials that can be used for restorative artificial teeth include various resin materials (dental composite resins such as composite resins for filling dental cavities, composite resins for abutment construction, and composite resins for crowns; denture base resins), denture base lining materials, impression materials, bonding materials such as resin cements and resin-added glass ionomer cements, fissure sealants, dental mill blanks, temporary crowns, and artificial tooth materials (e.g., porcelain teeth made from feldspar, silica, and / or clay (e.g., porcelain teeth made from porcelain material containing feldspar and silica); resin teeth made from synthetic resin (e.g., acrylic resin teeth, etc.); hard resin teeth made from hard synthetic resin, etc.). The artificial teeth for restoration may be commercially available products, such as hard resin teeth (product name "GC ZenOpal", manufactured by GC Corporation). The defective portion of the artificial tooth for restoration can be produced by machining (cutting and / or grinding, etc.) an artificial tooth for restoration that does not have a defective portion before processing. The machining method is not particularly limited, and any known method can be used. For machining, commercially available dental CAD / CAM machines, polishing equipment, etc. can be used.

[0065] First Embodiment In the first embodiment, the shades of the restorative artificial teeth included in the demonstration kit of the present invention are different from each other in order to enable efficient judgment of the color tone of dental restorative materials and to determine whether or not the prosthesis has color compatibility.

[0066] In a first embodiment of the demonstration kit of the present invention, it is preferable that the kit includes one prosthesis made of one color of dental restorative material and two or more artificial restorative teeth of different shades. As a result, by fitting one and the same prosthesis to two or more different shades (for example, B1 and A3.5, etc.), if the prosthesis has color compatibility, the color of the prosthesis will appear to change gradually at the boundary with the restorative artificial tooth even when it is fitted to the detachable part (W) of any restorative artificial tooth, making it easy to determine whether or not there is color compatibility, and making it easier to visually understand the performance of color compatibility. In the demonstration kit of the present invention, the formation position, shape, size, etc. of the defect portion in the artificial teeth for restoration are preferably the same for each of the artificial teeth for restoration.

[0067] In the first embodiment, from the viewpoint of reproducing the color tone of the "Vita Classical Shade Guide" manufactured by VITA Corporation that is used in actual dental treatment, it is preferable that the shades of the multiple restorative artificial teeth satisfy the above condition (i) and are two or more shades selected from the group consisting of A1, A2, A3, A3.5, A4, B1, B2, B3, B4, C1, C2, C3, C4, D2, D3, and D4.

[0068] There is no particular limitation on the way the plurality of artificial teeth for restoration are arranged during observation. They may be arranged randomly, in any arrangement determined by the observer, or in a line. The demonstration kit of the present invention includes a display plate (flat plate), on which an artificial restorative tooth can be placed as described above. From the standpoint of making observation easier, it is preferable to select the brightness sequence from highest to lowest as follows: B1 → A1 → B2 → D2 → A2 → C1 → C2 → D4 → A3 → D3 → B3 → A3.5 → B4 → C3 → A4 → C4, and arrange them in a line.

[0069] <Detachable part> The detachable portion is a structural portion that the prosthesis and the artificial tooth for restoration each have. The detachable portion (W) of the artificial tooth for restoration is the surface of the defect portion of the artificial tooth for restoration, and is a portion where the prosthesis can be attached and detached. The detachable portion (W) is not particularly limited as long as it can be fitted with the prosthesis in a concave-convex manner, and may include the wall surface 10 of the defect portion in FIG. 1B. The detachable portion (Z) of the prosthesis is the surface that faces the surface of the defect portion when the prosthesis is attached to the artificial tooth for restoration.

[0070] The shape of the detachable part of the artificial tooth for restoration is not particularly limited, and may be cut into a desired shape and surface polished as necessary. From the viewpoint of simulating the cutting of carious parts in general dental treatment, it is preferable that the shape is cut using a carbide bur or a diamond bur.

[0071] There are no particular limitations on the shape and size of the detachable part (Z) of the prosthesis, and from the viewpoint of being able to be attached to the missing part of the artificial tooth for restoration, it is preferable that the shape and size are within the range of 90 to 100% identical to the shape and size of the missing part of the artificial tooth for restoration, more preferably within the range of 93 to 100% identical, and even more preferably within the range of 95 to 100% identical.

[0072] The prosthesis and the artificial tooth for restoration are preferably attached and detached by physical fitting between the detachable parts, surface tension of the adherent liquid, various one-touch connectors or one-touch joints. Among them, the retention means by physical fitting and surface tension of the adherent liquid are particularly preferred because they are easy to operate and do not interfere with the observation of the color of the prosthesis.

[0073] <Repair sample> The restoration sample is prepared in a removable state by attaching a prosthesis to the missing part (detachable part (W)) of the artificial tooth for restoration via the detachable part (Z) on the surface opposite to the detachable part (W). There are no particular restrictions on the gap between the detachable part (Z) of the prosthesis inside the restoration sample and the detachable part (W) of the restorative artificial tooth, but it is preferable for a coating agent to be present, as this reflects the tooth color at the bottom of the defect and is more suitable for observing color compatibility.

[0074] The shape and thickness of the gap between the detachable part (Z) of the prosthesis and the detachable part (W) of the artificial tooth for restoration inside the restoration sample are factors that affect the shape and size of the detachable part (Z) of the prosthesis and the shape and size of the detachable part (W) of the artificial tooth for restoration. When preparing the prosthesis and the restorative artificial tooth, the shape and thickness of the gap when the detachable parts of the prosthesis and the restorative artificial tooth are attached to each other is measured in advance, and this can be used to determine the shape and thickness of the coating material in the restoration sample for later indirect restoration.

[0075] There is no particular limitation on the means for measuring the shape and thickness of the gap between the detachable part of the prosthesis and the detachable part of the artificial tooth for restoration inside the restoration sample, and any general measurement method may be used. Among them, X-ray projection, optical coherence tomography (OCT), ultrasonic testing, plaster casting, etc. are examples of methods that can determine the internal structure non-invasively.

[0076] Among these, molding with plaster or the like is preferred because it allows accurate measurement of the shape and thickness of the coating agent of the present invention. Specifically, the gap when the detachable parts of the prosthesis and the artificial tooth for restoration are attached to each other is sufficiently filled with plaster, the plaster is taken out, and the shape and thickness are measured, and the shape and thickness of this plaster are regarded as the shape and thickness of the coating agent. The average thickness of the coating material in the restoration samples in this study is a factor that affects the space thickness of the gap when the detachable parts of the prosthesis and the restorative artificial tooth are attached to each other, and can be regarded as the space thickness of the gap. The average thickness of the coating material in the restoration sample is not particularly limited, but should not be thicker than the depth of the missing part of the restorative artificial tooth. From the viewpoint of checking the color tone of the prosthesis itself, the average thickness is preferably 0.001 mm or more and 2 mm or less, more preferably 0.005 mm or more and 1.5 mm or less, and even more preferably 0.01 mm or more and 0.8 mm or less. If the average thickness of the coating material in the restoration sample exceeds 2 mm, the color of the bottom surface of the missing part of the restorative artificial tooth and the color of the coating material will be more prevalent than the color of the prosthesis, making it unsuitable from the perspective of checking the color of the prosthesis. The average thickness of the coating material in the restoration sample can be regarded as the thickness of the gap between the detachable part of the prosthesis and the detachable part of the restorative artificial tooth inside the restoration sample. The method for measuring the average thickness of the coating in the repaired sample is as described in the Examples section below.

[0077] It is preferable that the demonstration kit of the present invention consists only of a restorative artificial tooth having the detachable part (W) and a prosthesis having the detachable part (Z), but it may also contain a coating agent, etc. as long as it does not interfere with the effects of the present invention.

[0078] <Coating agent> In one embodiment, the dental demonstration kit of the present invention preferably contains a coating agent, since this improves the reflection of the color of the artificial restorative tooth. When the dental demonstration kit includes a coating agent, it is preferable to thoroughly coat the coating agent on the detachable part (W) of the restorative artificial tooth and / or the detachable part (Z) of the prosthesis, attach the detachable parts together, remove excess coating agent, etc., and then observe the prosthesis, with the aim of ensuring tight adhesion between the detachable part of the prosthesis and the coating agent, and between the coating agent and the detachable part of the restorative artificial tooth without trapping any air.

[0079] The coating agent is not particularly limited, and may be a commonly used material or a commercially available product. The coating agent preferably has high transparency since it reflects the color of the tooth substance at the bottom of the defect and is suitable for observation. Specific examples of the coating agent include water, colored water, glycerin, grease, a fluorine / silicone oil release agent, a non-silicone oil release agent, and a dental color matching confirmation material. In view of high aesthetics and excellent operability, a non-volatile solvent is more preferable, and a dental color matching confirmation material or water is even more preferable.

[0080] The coating agent is not particularly limited, and in an embodiment, may be a dental curable composition containing a polymerizable monomer, a polymerization initiator, and a filler, and further a colorant as necessary. When the coating agent contains a polymerizable monomer, the content of the polymerization initiator in the coating agent is preferably 1000 ppm by mass or less, more preferably 500 ppm by mass or less, and even more preferably 100 ppm by mass or less, because once the prosthesis and the artificial tooth for restoration are bonded, they cannot be removed and color compatibility cannot be evaluated.

[0081] The polymerization initiator includes an organic peroxide and / or an inorganic peroxide. The organic peroxide is not particularly limited and may be any known organic peroxide. Representative organic peroxides include hydroperoxides, peroxyesters, ketone peroxides, peroxyketals, dialkyl peroxides, diacyl peroxides, and peroxydicarbonates.

[0082] The inorganic peroxide is not particularly limited and may be any known inorganic peroxide. Representative inorganic peroxides include peroxodisulfates and peroxodiphosphates. Specific examples include sodium peroxodisulfate, potassium peroxodisulfate, aluminum peroxodisulfate, and ammonium peroxodisulfate.

[0083] There is no particular limitation on the coating agent, but when the coating agent contains a polymerizable monomer, the content of the polymerizable monomer in the coating agent is preferably 10000 mass ppm or less. In particular, if the detachable part of the prosthesis and the artificial tooth for restoration are bonded, they cannot be removed, and color compatibility cannot be evaluated, so the content is more preferably 1000 mass ppm or less, and even more preferably 100 mass ppm or less.

[0084] The polymerizable monomer is not particularly limited, and may be any known polymerizable monomer, including any known polymerizable monomer used in dental hardenable compositions, particularly radical polymerizable monomers.

[0085] The coating agent is not particularly limited, but when the coating agent contains a polymerizable monomer and a polymerization initiator, it is preferable that the content of the polymerization initiator is 1000 ppm by mass or less and the content of the polymerizable monomer is 10000 ppm by mass or less. In particular, once the detachable parts of the prosthesis and the restorative artificial tooth are adhered, they cannot be removed and color compatibility cannot be evaluated, so it is more preferable that the content of the polymerization initiator is 500 ppm by mass or less and the content of the polymerizable monomer is 1,000 ppm by mass or less, and even more preferable that the content of the polymerization initiator is 100 ppm by mass or less and the content of the polymerizable monomer is 100 ppm by mass or less.

[0086] There is no particular restriction on the transparency ΔL of the coating agent at a thickness of 1.0 mm, but since it tends to reflect the bottom surface of the missing part of the restorative artificial tooth, it is preferably 10 or more and 60 or less, more preferably 11 or more and 58 or less, and even more preferably 12 or more and 55 or less. The transparency ΔL was measured by forming a coating layer with a thickness of 1.0 mm and placing a standard white plate behind (below) the coating layer. * a * b * Lightness in color space (L * / w) and L measured by placing a standard black board behind (below) the coating layer. * a * b* Lightness in color space (L * / b) (absolute value). The method for measuring the transparency ΔL is specifically as described in the Examples section below.

[0087] In the demonstration kit of the present invention, the coating agent is an optional component. Some embodiments include a demonstration kit that does not include a coating agent. Since the demonstration kit of the present invention does not include a coating agent, the step of applying a coating agent is not necessary, and color evaluation can be performed more easily.

[0088] The dental color matching confirmation material, which is the coating agent, is not particularly limited, and may be one having a known composition, may be prepared by a known manufacturing method, or may be a commercially available product. As known dental color matching confirmation materials, for example, those having compositions described in JP-A-2007-137851, JP-A-2010-143851, JP-A-2011-132185, etc. can be used. Commercially available products include the "PANAVIA (registered trademark) V5 Try-in Paste" series (manufactured by Kuraray Noritake Dental Co., Ltd.). An example of a dental color matching confirmation material is one whose composition includes a polyhydric alcohol (e.g., glycerin, polyethylene glycol, propylene glycol, polypropylene glycol, etc.) as the main component, a filler, and a colorant. The content of these components is not particularly limited as long as the effect as a dental color matching confirming material is obtained within the range.

[0089] The type of filler in the dental color matching confirmation material is not particularly limited, and known inorganic fillers and / or organic fillers can be used.

[0090] Examples of inorganic fillers for dental color matching confirmation materials include silicon dioxide (quartz, glass, silica, etc.), alumina, ceramics, clay minerals such as diatomaceous earth, kaolin, and montmorillonite, activated clay, synthetic zeolite, mica, calcium phosphate, and barium sulfate. Among these, colloidal silica and alumina are preferred. As the colloidal silica, particularly preferred are silica having a small particle size obtained by a spray pyrolysis method, such as the product name "Aerosil (registered trademark)" of Nippon Aerosil Co., Ltd.; silica sol obtained by a wet method; and monodisperse silica obtained by a sol-gel method. At least a part of the filler may be an inorganic pigment such as titanium oxide or red iron oxide.

[0091] Examples of organic fillers for dental color matching confirmation materials include polymethyl methacrylate, polyethyl methacrylate, polyfunctional methacrylate polymers, polyamide, polystyrene, polyvinyl chloride, chloroprene rubber, nitrile rubber, and styrene-butadiene rubber.

[0092] When the inorganic filler of the dental color matching confirmation material is surface-treated in advance with a known silane compound such as a silane coupling agent, its affinity with glycerin can be adjusted, and a composition with excellent handleability as a dental material can be obtained. As the silane compound, any known silane compound can be used without any limitation.

[0093] There are no particular limitations on the coloring agent for the dental color match confirmation material, and either inorganic pigments and / or organic pigments can be used without limitation depending on the intended color tone of the dental color match confirmation material.

[0094] The method of manufacturing the dental color matching confirmation material according to the present invention is not particularly limited, and may be prepared by a known manufacturing method. Specifically, it can be obtained by blending and mixing each component in a predetermined content. The order of blending is not particularly limited, and each component may be blended at once or in two or more batches. If necessary, the compositions may be mixed or kneaded, or may be subjected to a degassing treatment such as a vacuum degassing treatment. The dental hardenable composition thus obtained can be filled into a single container (such as a syringe) to prepare a one-material (one-paste) dental color matching confirmation material.

[0095] There are no particular limitations on the L*a*b* color system for a 1.0 mm thick dental color matching confirmation material, and any value may be used. Since this allows the color tone of natural teeth to be more accurately reproduced during observation and makes it easier to evaluate color compatibility, it is preferable that the values ​​are within the ranges of L* / w = 70.0 to 110.0, a* / w = -5.0 to 15.0, and b* / w = -5.0 to 40.0, and it is more preferable that the values ​​are within the ranges of L* / w = 73.0 to 100.0, a* / w = -4.5 to 14.0, and b* / w = 0.0 to 37.0, and it is even more preferable that the values ​​are within the ranges of L* / w = 75.0 to 90.0, a* / w = -4.0 to 13.0, and b* / w = 5.0 to 35.0, since this allows the color tone of natural teeth to be more accurately reproduced.

[0096] Another embodiment of the present invention is a method for evaluating the color of a dental restorative material, comprising the steps of: In any one of the dental demonstration kits described above, a step of preparing a first restoration sample by fitting a detachable part (W-1) of a first restoration artificial tooth with a detachable part (Z) of the prosthesis; removing said prosthesis from a first restoration sample; a step of preparing a second restoration sample by fitting a detachable portion (W-2) of a second restoration artificial tooth with a detachable portion (Z) of the prosthesis; and comparing the color of the first repair sample to the color of the second repair sample; A method for evaluating the color of dental restorative materials is provided.

[0097] In the method for evaluating the color of a dental restorative material, in terms of evaluating the color compatibility of the dental restorative material, it is preferable that the two or more artificial restorative teeth have different shades. By using the above-mentioned method for evaluating the color of a dental restorative material, it is possible to easily evaluate whether or not a dental restorative material has color compatibility.

[0098] In the method for evaluating the color of a dental restorative material, the detachable part (W-1) and the detachable part (Z) and / or the detachable part (W-2) and the detachable part (Z) may be fitted together via a coating agent. The method for applying the coating agent is not particularly limited. In the method for evaluating the color of dental restorative materials, the number of restorative artificial teeth is preferably 2 to 10, more preferably 2 to 8, and even more preferably 2 to 5 from the viewpoints of ease of operation during observation, ease of comparison of the colors of each prosthesis, and ease of handling. In addition, in the method for evaluating the color of dental restorative materials, the number of prostheses is preferably 1 to 10, more preferably 1 to 8, and even more preferably 1 to 5, from the viewpoints of ease of operation during observation, ease of comparison of the colors of each prosthesis, and ease of evaluation of color compatibility. In one preferred embodiment, there is provided a method for evaluating the color of dental restorative materials, wherein the dental demonstration kit includes one prosthesis.

[0099] In the process of comparing the color of the first repaired sample with the color of the second repaired sample, the method of color comparison is not particularly limited, and may be performed visually, or the colors of the first repaired sample and the second repaired sample may be measured and compared using a colorimeter. The color may be measured using a known measuring device (for example, a spectrophotometer, a spectrophotometer, etc.). Furthermore, the method of comparing colors is not particularly limited as long as the first and second restored samples can be compared on the same basis, and may be either a spectrophotometric colorimetric method or a direct reading of stimulus values. For example, a dental color measuring device (product name "Crystaleye", manufactured by Olympus Corporation) was used to measure the L*a*b* color space (JIS Z 8781-4:2013 Colorimetry - Part 4: CIE 1976 L*a*b* color space) (L* ,a * ,b * ) the color (brightness, saturation, etc.) of the original artificial tooth for restoration before the defect is formed and the color (brightness, saturation, etc.) of the artificial tooth for restoration after the defect is formed and fitted with a prosthesis that has a matching color tone, and the color difference (ΔE) can be calculated from the measurement results. The color difference can also be used to evaluate the color compatibility of the prosthesis.

[0100] <Second embodiment> In a second embodiment, the demonstration kit of the present invention includes two or more artificial restorative teeth having the same shade, and includes two or more prosthetic appliances having different shades. In the second embodiment, since it becomes easier to emphasize color compatibility, it is preferable that the prostheses include one or more prostheses made of dental restorative materials having color compatibility and one or more prostheses made of dental restorative materials not having color compatibility. The second embodiment makes it easier to emphasize the color match of dental restorative materials that have color matching by using a prosthesis made of a dental restorative material that does not have color matching to demonstrate the lack of color matching. By preparing restoration samples by fitting a prosthesis made of a dental restorative material with color compatibility and a prosthesis made of a dental restorative material without color compatibility to restorative artificial teeth of the same shade, it becomes possible to determine that the prosthesis has color compatibility when it looks completely different and has a transitional color tone, making it easier to emphasize the difference between the presence and absence of color compatibility. In the second embodiment, as described above, when a restoration sample is produced, it is easier to visually understand the difference due to the presence or absence of color compatibility, so it is preferable that the missing parts of two or more restorative artificial teeth are identical in terms of formation position, shape, size, etc. On the other hand, in the second embodiment, the shape of the defect in the artificial restorative tooth may be different in order to show that the color compatibility does not depend on the shape of the defect. Except where otherwise specified, the rest is the same as that described in the first embodiment.

[0101] <Third embodiment> In a third embodiment, the demonstration kit of the present invention has two or more of the artificial restorative teeth having the same shade, and the kit includes two or more prosthetic appliances having the same color tone. In a third embodiment of the demonstration kit of the present invention, it is preferable to have two or more prostheses made of one color of dental restorative material and two or more restorative artificial teeth of the same shade, each having a different shape of the defect portion. Prostheses corresponding to different missing parts are produced from dental restorative materials having the same shade. For example, when two restorative artificial teeth having the same shade but different missing parts are used, two types of prostheses corresponding to the missing parts of the restorative artificial teeth are produced so as to have shapes that can be fitted into the missing parts of the respective restorative artificial teeth. Each of the obtained prostheses can be fitted into the missing parts of the restorative artificial teeth, and it can be visually demonstrated that the color compatibility does not depend on the shape of the missing part, that is, the color appears to change even when the shape of the missing part is different. In the third embodiment, the shapes of the missing parts of two or more artificial restorative teeth may be different from each other in order to obtain the effect of emphasizing color matching. Except where otherwise specified, the rest is the same as that described in the first embodiment.

[0102] The present invention includes embodiments in which part or all of the above configurations are combined in various ways within the scope of the technical idea of ​​the present invention, as long as the effects of the present invention are achieved. EXAMPLES

[0103] The present invention will be specifically described below with reference to examples and comparative examples, but the present invention is not limited to the following examples.

[0104] (Polymerizable monomer (A)) UDMA: 2,2,4-trimethylhexamethylenebis(2-carbamoyloxyethyl)dimethacrylate (Kyoeisha Chemical Co., Ltd.) 3G: Triethylene glycol dimethacrylate (manufactured by Shin-Nakamura Chemical Co., Ltd.)

[0105] (Polymerization initiator (B)) THP: 1,1,3,3-tetramethylbutyl hydroperoxide (NOF Corporation)

[0106] (Inorganic filler (C)) As the inorganic filler (C), the one obtained in the following Production Example was used.

[0107] [Production of inorganic filler (c-1)] 100 parts by mass of commercially available barium glass (GM27884 UF2.0, manufactured by Schott, average particle size: 2.0 μm, refractive index: 1.53), 1.2 parts by mass of 3-methacryloyloxypropyltrimethoxysilane (manufactured by Shin-Etsu Chemical Co., Ltd.), 0.15 parts by mass of acetic acid, 5 parts by mass of distilled water, and 170 parts by mass of ethanol were placed in a three-necked flask and stirred at room temperature for 1 hour. After distilling off the ethanol under reduced pressure, the mixture was vacuum dried at 40°C for 16 hours and further heated at 90°C for 3 hours to obtain an inorganic filler (c-1) provided with a surface treatment layer.

[0108] (Colorant (D)) Titanium oxide, black iron oxide, yellow iron oxide, red iron oxide

[0109] (Monomer Composition) [Production of Monomer Composition (m-1)] As the polymerizable monomer (A), 60 parts by mass of UMDA and 40 parts by mass of 3G were prepared, and as the polymerization initiator (B), 1 part by mass of THP was prepared. The THP was dissolved in the mixture of UMDA and 3G to prepare a monomer composition (m-1).

[0110] (Dental restorative materials) The dental restorative material used was a dental mill blank (U-1) obtained in the following manufacturing example. Also, a commercially available resin block or dental composite resin was used as it was.

[0111] [Manufacturing example of dental mill blank (U-1)] The dental mill blanks were prepared by mixing and kneading the materials and proportions shown in Table 1 at room temperature (23°C) in a dark place, homogenizing the mixture, and vacuum degassing to prepare dental hardenable compositions. The dental hardenable composition was filled into a rectangular parallelepiped concave container with inner dimensions of 15 mm x 15 mm and depth of 20 mm, and fixed in the chamber of an autoclave, and replaced with 99.9% nitrogen gas at 0.15 MPa 12 times, then the pressure was increased to 0.4 MPa with nitrogen gas, and at the same time as the pressure increase was completed, the temperature inside the chamber was increased to 130° C. Thereafter, the composition was maintained at 130° C. for 60 minutes to polymerize and harden, thereby obtaining a dental mill blank (U-1).

[0112] [Table 1]

[0113] [Commercially available products] Dental mill blank (product name "Katana (registered trademark) Avencia (registered trademark) Block 2", A2LT, 14L size, manufactured by Kuraray Noritake Dental Co., Ltd., L* / w=79.72, a* / w=1.67, b* / w=26.64, ΔL=14.11) Dental composite resin 1 (product name "Clearfil (registered trademark) Majesty (registered trademark) ES-2 Universal", L* / w=84.36, a* / w=2.21, b* / w=22.76, ΔL=18.34, manufactured by Kuraray Noritake Dental Co., Ltd.) Dental composite resin 2 (product name: Clearfil (registered trademark) Majesty (registered trademark) ES-2 A2, L* / w=85.15, a* / w=1.93, b* / w=24.40, ΔL=16.37, manufactured by Kuraray Noritake Dental Co., Ltd.) These measurement results are described later in [Lightness (L * / w), chromaticity index (a * / w,b * / w), transparency (ΔL * ) is a value measured by the method described in the above.

[0114] (Coating agent) The dental color matching confirmation material (t-1) obtained in the following production example was used as the coating agent. In addition, a commercially available dental color matching confirmation material was used as it was.

[0115] [Manufacturing example of dental color matching confirmation material (t-1)] A dental color matching confirmation material (product name "PANAVIA (registered trademark) V5 Try-in Paste (Clear)" manufactured by Kuraray Noritake Dental Co., Ltd.) and Japanese Pharmacopoeia concentrated glycerin (manufactured by Kao Corporation) were mixed and kneaded in a ratio of 1:2, and the mixture was made homogenous and vacuum degassed to obtain a dental color matching confirmation material (t-1).

[0116] [Commercially available dental color matching materials] t-CL: (Product name "PANAVIA (registered trademark) V5 Try-in Paste (Clear)", manufactured by Kuraray Noritake Dental Co., Ltd.) t-UN: (Product name "PANAVIA (registered trademark) V5 Try-in Paste (Universal)", manufactured by Kuraray Noritake Dental Co., Ltd.) t-BR: (Product name "PANAVIA (registered trademark) V5 Try-in Paste (Brown)", manufactured by Kuraray Noritake Dental Co., Ltd.) t-BL: (Product name "PANAVIA (registered trademark) V5 Try-in Paste (Bleach)", manufactured by Kuraray Noritake Dental Co., Ltd.)

[0117] [Lightness (L * / w), chromaticity index (a * / w,b * / w), transparency (ΔL * ) calculation] The lightness and chromaticity of the coating agent and dental restorative material were evaluated using the above-mentioned spectrocolorimeter (SE6000, manufactured by Nippon Denshoku Industries Co., Ltd., light source: D65 / 2, measurement window: φ6 mm) used as the ratio of spectral reflectance. (1) Coating agent The coating agents were evaluated as follows. Specifically, a 1.0 mm thick round spacer was placed on top of a round cover glass, an appropriate amount of coating material was applied, and a round cover glass was placed on top of the coating material and pressed down. A standard white plate was placed behind the round cover glass with the coating material sandwiched between them. In this state, the center of the L * a * b * Lightness in color space (L * / w), and chromaticity index (a * / w,b * / w) was measured (n=1). Next, with the standard black plate placed behind the round cover glass with the coating material in between, * a * b * Lightness in color space (L * / b) was measured (n=1). The obtained L * / w and L * The difference in transparency (ΔL * ) was calculated. (2) Dental mill blanks The dental mill blank was machined to a thickness of 1 mm, and both sides were polished to a mirror finish. The lightness, chromaticity index and transparency of this cured material were measured in the same manner as above. The measurement results are shown in Table 1. (3) Dental composite resin The dental composite resin was filled into a stainless steel mold (φ10 mm × thickness 1 mm), sandwiched between cover glasses from above and below, and pressed together. It was then cured by irradiating both sides with light using an LED light curing device (α Light V, manufactured by Morita Seisakusho Co., Ltd., peak wavelengths: (purple) 400-408 nm, (blue) 465-475 nm) for 45 seconds each. The cured product was removed from the mold, and the lightness, chromaticity index, and transparency of the cured product were measured in the same manner as above. The measurement results for Dental Composite Resin 1 and Dental Composite Resin 2 were as described above.

[0118] [Measurement of the average thickness of the coating between the prosthesis and the restorative artificial tooth] The average thickness of the coating material between the prosthesis and the artificial tooth for restoration was determined by pouring plaster into the space between the detachable part of the artificial tooth for restoration and the detachable part of the prosthesis and measuring the size of the plaster mold. Specifically, ultra-hard dental plaster (product name "M Lock Peach", manufactured by Morita Corporation) was applied to the detachable portion of the restorative artificial tooth, the prosthesis was attached, excess plaster was wiped off, and the tooth was left to stand for one hour. The prosthesis was then removed, and the hardened plaster was taken out. The thickness of this plaster was measured at 10 random locations using a micrometer (trade name "Digimatic Point Micrometer", tip angle: 15°, Mitutoyo Corporation), and the average value was taken as the average thickness of the coating agent between the prosthesis and the artificial tooth for restoration. The average thickness of the coating agent can be considered as the space thickness (the shortest distance between the prosthesis and the artificial tooth for restoration) of the gap when the detachable parts of the prosthesis and the artificial tooth for restoration are attached to each other.

[0119] The kits obtained in each of the Examples and Comparative Examples were used to carry out the following Tests X and Y. The results are shown in Tables 2 to 4. [Test X] The difference (color difference) between the color of the prosthesis attached to the missing part of the restorative artificial tooth and the color of the restorative artificial tooth was visually confirmed. Ten dental professionals were asked to check these color differences and to choose one of the following two answers in response to the question, "Was there a transitional change in color tone at the boundary between the prosthesis and each restorative artificial tooth?" [X-1: It was possible to determine whether the color tone was changing or not.] [X-2: Unable to determine if the color tone is transitioning.]

[0120] For the above evaluation items, the number of people who answered [X-1] that they were able to determine whether or not there was a transitional change in color tone is preferably 6 / 10 or more, more preferably 8 / 10 or more, and even more preferably 10 / 10.

[0121] [Test Y] The difference in color tone (color difference) was visually confirmed when comparing the color tone of the prosthesis when attached to the artificial tooth for restoration (restoration sample state) with the color tone of the prosthesis when removed and placed on a black desk. We asked 10 dental professionals to check the color difference at this time and select one of the following two answers in response to the question, "Does the prosthesis have a color that changes between inside each artificial tooth and on the desk, and is it a color that is compatible with a wide range of colors?" [Y-1: It was possible to determine whether the color was compatible with a wide range of colors or not.] [Y-2: It was not possible to determine whether the color would suit a wide range of colors.] For the above evaluation items, it is preferable that the number of people who answered [Y-1] that they were able to determine whether or not the color tone was compatible with a wide range of color tones is 6 / 10 or more, more preferably 8 / 10 or more, and even more preferably 10 / 10.

[0122] [Evaluation as a demonstration kit] Based on the evaluation results of [Test X] and [Test Y] above, the following indicators were used to determine the number of people who selected X-2 and Y-2. A: The number of people who selected X-2 and Y-2 is two or less. B: Other than A and C C: The number of people who selected either X-2 or Y-2 was 5 or more; or the tooth could not be fitted into the detachable part of each artificial tooth for restoration or could not be removed from the detachable part of each artificial tooth for restoration, making it impossible to evaluate. Regarding the above evaluation results, for a demonstration kit, from the viewpoint of enabling efficient evaluation of the color tone of dental restorative materials (including emphasizing known color tone compatibility and / or evaluating the presence or absence of color tone compatibility), it is preferable that the kit be rated as "A" or "B," and it is even more preferable that the kit be rated as "A."

[0123] [Example 1] Hard resin teeth of shades B1 and A3.5 (product name "GC Zen Opal", 6th molar (size: mandibular 1 form / 4 size, PL16), manufactured by GC Corporation) were used as restorative artificial teeth, and class II OD cavities measuring 4.0 mm in length x 6.0 mm in width x 3.0 mm in depth with the same size and formation position of the defect were formed in each case, and detachable parts were created. A prosthesis for B1 (B1-U1-1) and a prosthesis for A3.5 (A3.5-U1-1) having detachable parts that can fit into the detachable parts of the shades B1 and A3.5 were fabricated from a dental mill blank (U-1) using a dental CAD / CAM machine (product name "DWX-51D", manufactured by Roland DG Corporation) so that they could be fitted into the detachable parts of the restorative artificial teeth B1 and A3.5 in which the cavities had been formed. These prostheses were cut using an electric dental laboratory handpiece (product name "Maxima 80", manufactured by Argofile Japan Co., Ltd.) with a dental grinding tool (product name "Shofu Carborundum Point HP", model: 11, manufactured by Matsufu Co., Ltd.), and the sprue marks were smoothed using a dental grinding tool (product name "Shofu Carborundum Point HP", model: 13, manufactured by Matsufu Co., Ltd.). Furthermore, the shape of the detachable portion of the prosthesis was corrected, and then the occlusal surface was polished. The occlusal surface was polished using the following method. The occlusal surface was polished using a dental rubber abrasive (product name "EVE Universal White", product number: H4, manufactured by San Dental Co., Ltd.), then the dental rubber abrasive was replaced with a dental polishing device (product name "Abbott Robinson Bristol Brush No. 11 Soft", manufactured by Buffalo Dental Manufacturing Co., Ltd. (USA)), abrasive particles of the dental abrasive (product name "Porsey Haydn", manufactured by Tokyo Dental Materials Co., Ltd.) were applied to the tip of the brush, and the tooth was polished with the brush with the abrasive particles to give it a glossy finish. In this manner, a dental demonstration kit was produced. Next, a dental color matching confirmation material (trade name "PANAVIA (registered trademark) V5 Try-in Paste (Clear)" manufactured by Kuraray Noritake Dental Co., Ltd.) was applied to the detachable portion of the artificial tooth for restoration of shade B1, and the prosthesis for B1 was attached to prepare the first restoration sample. The excess dental color matching confirmation material overflowing from the detachable portion was wiped off. For the first restoration sample, photographs of the artificial restorative tooth having a Class II OD cavity before the B1 prosthesis was attached to the artificial restorative tooth and photographs of the B1 prosthesis are shown in Figures 3A and 3B, respectively. FIG. 4 shows a photograph of the first restoration sample after the B1 prosthesis was attached to the restorative artificial tooth. Next, a dental color matching confirmation material (product name "Panavia (registered trademark) V5 Try-in Paste (Universal)", manufactured by Kuraray Noritake Dental Co., Ltd.) was applied to the detachable portion of the A3.5 restorative artificial tooth, and a prosthesis for A3.5 was attached to prepare a second restoration sample. Then, the above-mentioned tests X and Y were carried out using the produced prostheses and artificial teeth for restoration.

[0124] [Example 2] Using the dental restorative material, and in the same manner as in Example 1, a prosthesis was produced from a dental mill blank (U-1) as a B1 prosthesis and an A3.5 prosthesis (B1 and A3.5). A dental demonstration kit was produced in the same manner as in Example 1, except that the prosthesis was changed to a B1 prosthesis and A3.5 prosthesis (B1 and A3.5), and tests X and Y were carried out. Specifically, the dental color matching confirmation material shown in Table 1 was applied to the detachable portion of the artificial tooth for restoration of shade B1, and the first restoration sample was prepared by attaching the prosthesis for B1 and the prosthesis for A3.5. The excess dental color matching confirmation material overflowing from the detachable portion was wiped off. Next, the B1 prosthesis / A3.5 prosthesis was removed, the prosthesis was washed with water, and the dental color matching confirmation material listed in Table 1 was applied to the detachable portion of the A3.5 restorative artificial tooth. The B1 prosthesis / A3.5 prosthesis was then attached to prepare a second restoration sample. The above-mentioned tests X and Y were carried out using each of the prepared prostheses and artificial teeth for restoration.

[0125] [Example 3] A dental demonstration kit was produced in the same manner as in Example 1, except that the missing parts of the artificial teeth for restoration were changed from Class II OD cavities to Class I cavities (position: center, diameter: 4 mm, depth: 3 mm), and the prostheses were changed to B1 prostheses (B1-U1-2) and A3.5 prostheses (A3.5-U1-2) having detachable parts that can be fitted into the detachable parts of the artificial teeth for restoration of B1 and A3.5 in which the cavities were formed, and that the prostheses were produced so that the detachable parts can be fitted into the detachable parts of the shades B1 and A3.5. The above-mentioned tests X and Y were carried out using the obtained dental demonstration kit.

[0126] [Example 4] A dental demonstration kit was produced in the same manner as in Example 1, except that the dental color matching confirmation material was changed to that shown in Table 1. The above-mentioned tests X and Y were carried out using the obtained dental demonstration kit.

[0127] [Example 5] A dental demonstration kit was produced in the same manner as in Example 1, except that the dental color matching confirmation material was changed to that shown in Table 1. The above-mentioned tests X and Y were carried out using the obtained dental demonstration kit.

[0128] [Example 6] A dental demonstration kit was prepared in the same manner as in Example 1, except that the B1 prosthesis (B1-U1-1) used in Example 1 was changed to the prosthesis (B1-U1-3) below, and the A3.5 prosthesis (A3.5-U1-1) was changed to the prosthesis (A3.5-U1-3) below. The prosthesis (B1-U-3) was prepared by cutting the attachment / detachment surface of the prosthesis (B1-U1-1) using an electric dental laboratory handpiece (product name "Maxima 80", manufactured by Argofile Japan Co., Ltd.) and a dental grinding tool (product name "Shofu Carborundum Point HP", model: 11, manufactured by Shofu Co., Ltd.) to a thickness of approximately 0.5 to 1.0 mm while visually observing the cutting area. The prosthesis (A3.5-U1-3) was also fabricated by cutting the attachment surface of the prosthesis (A3.5-U1-1). Using the obtained dental demonstration kit, the above tests X and Y were carried out.

[0129] [Example 7] A prosthesis for B1 (B1-U1-4) and a prosthesis for A3.5 (A3.5-U1-4) were prepared in the same manner as in Example 6, except that the entire surface of the detachable part of the prosthesis (the surface facing the missing part of the restorative artificial tooth) was visually cut to a thickness of approximately 1.0 to 1.5 mm in the thickness direction in order to change the thickness of the coating material layer in the restoration sample. Except for changing the prosthesis to these, a dental demonstration kit was produced in the same manner as in Example 1. The above-mentioned tests X and Y were carried out using the obtained dental demonstration kit.

[0130] [Example 8] A dental demonstration kit was produced in the same manner as in Example 1, except that the dental color matching confirmation material was changed to that shown in Table 1. The above-mentioned tests X and Y were carried out using the obtained dental demonstration kit.

[0131] [Example 9] A dental demonstration kit was produced in the same manner as in Example 1, except that the dental color matching confirmation material was changed to water. The above-mentioned tests X and Y were carried out using the obtained dental demonstration kit.

[0132] [Example 10] A dental demonstration kit was produced in the same manner as in Example 1, except that the dental color matching confirmation material was not used. The above-mentioned tests X and Y were carried out using the obtained dental demonstration kit.

[0133] [Example 11] A dental demonstration kit was prepared in the same manner as in Example 1, except that the dental restorative material was changed from the dental mill blank (U-1) to the dental restorative material shown in Table 3, and the prosthesis was changed to the prosthesis (B1-Ave-A2) and the prosthesis (A3.5-Ave-A2). The above-mentioned tests X and Y were carried out using the obtained dental demonstration kit. The prostheses (B1-Ave-A2) and (A3.5-Ave-A2) were prepared in the same manner as in the Examples, except that the dental mill blank (U-1) was changed to the dental restorative material shown in Table 3.

[0134] [Example 12] A dental demonstration kit was prepared in the same manner as in Example 1, except that the dental restorative material was changed to dental composite resin 1 and the prostheses were changed to B1 prostheses (B1-ES2-1) and A3.5 prostheses (A3.5-ES2-1). Tests X and Y were carried out. Specifically, high vacuum grease (manufactured by DuPont Toray Specialty Materials Co., Ltd.) was applied to the defected portion of the restorative artificial teeth of shades B1 and A3.5 in which the defected portion was formed, dental composite resin 1 was piled up, and the surface shape of the restorative artificial teeth was formed by pressing it down with a mold of the restorative artificial teeth made in advance with a silicone impression material (Memosil (registered trademark) 2, manufactured by Kulzer Japan), and the surface shape of the restorative artificial teeth was shaped, and the visible light was irradiated for 10 seconds with a dental visible light irradiator (trade name "Pencure 2000", manufactured by Morita Manufacturing Co., Ltd.), and the mold was removed and irradiated for another 10 seconds. After that, the filled dental composite resin 1 was taken out, the restorative artificial teeth and the cured product were washed with water, and the cured product was polished and polished in the same manner as in Example 1, and a dental demonstration kit was produced. A dental demonstration kit was prepared in the same manner as in Example 1, and the above-mentioned tests X and Y were carried out.

[0135] [Example 13] Except for changing the dental restorative material to that shown in Table 4 and changing the prosthesis to a B1 prosthesis (B1-ES2-A2) and an A3.5 prosthesis (A3.5-ES2-A2), a dental demonstration kit was prepared in the same manner as in Example 12, and the above-mentioned tests X and Y were carried out.

[0136] [Example 14] A dental demonstration kit was prepared in the same manner as in Example 12, except that the dental color matching confirmation material was not used, and the above-mentioned tests X and Y were carried out.

[0137] [Example 15] A dental demonstration kit was prepared in the same manner as in Example 1, except that the missing part of the restorative artificial tooth of shade A3.5 was changed from an OD cavity to one having a Class II MOD cavity (position: center, length 4.0 mm × width 11.0 mm × depth 3.0 mm), and one prosthesis was changed to an A3.5 prosthesis (A3.5-U1-3) corresponding to the restorative artificial tooth. The prosthesis for A3.5 (A3.5-U1-3) was fabricated so as to be fitted into the detachable portion of the artificial tooth for restoration of A3.5 in which the Class II MOD cavity was formed. Using the obtained dental demonstration kit, the above tests X and Y were carried out.

[0138] [Example 16] A dental demonstration kit was prepared in the same manner as in Example 1, except that the restorative artificial tooth of shade A3.5 was changed to a restorative artificial tooth of shade B1, the missing portion of the restorative artificial tooth of shade B1 was changed to a Class II MOD cavity (position: center, length 4.0 mm x width 11.0 mm x depth 3.0 mm), and one prosthesis was changed to a B1 prosthesis (B1-U1-3) corresponding to the restorative artificial tooth. The prosthesis for B1 (B1-U1-3) was fabricated so as to be fitted into the detachable portion of the artificial tooth for restoration of B1 in which the Class II MOD cavity was formed. Using the obtained dental demonstration kit, the above tests X and Y were carried out.

[0139] [Example 17] A dental demonstration kit was prepared in the same manner as in Example 1, except that the restorative artificial teeth of shade A3.5 were changed to restorative artificial teeth of shade B1, and the A3.5 prosthesis (A3.5-U1-1) was changed to the B1 prosthesis (B1-Ave-A2) used in Example 11. Using the obtained dental demonstration kit, the above tests X and Y were carried out.

[0140] [Comparative Example 1] In a dental demonstration kit, a prosthesis similar to that in Example 1 was prepared, except that a shade guide (product name "Vita Classical Shade Guide", shade: B1 / A3.5, manufactured by VITA) was used instead of the artificial tooth for restoration, and the following tests were performed. First, the B1 prosthesis (B1-U1-1) was placed on the tooth surface of the B1 shade guide, and the colors were compared to visually confirm the difference (color difference) between the prosthesis color and the shade guide color. Then, the A3.5 shade guide and the A3.5 prosthesis (A3.5-U1-1) were similarly visually confirmed for the difference (color difference) in color. Ten dental professionals were asked to check these color differences and to choose one of the following two answers in response to the question, "Was there a transitional change in color tone at the boundary between the prosthesis and each shade guide?" [X-1: It was possible to determine whether the color tone was changing or not.] [X-2: Unable to determine if the color tone is transitioning.]

[0141] For the above evaluation items, the number of people who answered [X-1] that they were able to determine whether or not there was a transitional change in color tone is preferably 6 / 10 or more, more preferably 8 / 10 or more, and even more preferably 10 / 10. In Comparative Example 1, since no artificial tooth for restoration was used, the above evaluation was equivalent to the evaluation of Test X in the Examples. Next, the B1 prosthesis (B1-U-1) was placed on the occlusal surface of the B1 shade guide, and their colors were compared. After that, the B1 shade guide and the B1 prosthesis (B1-U-1) were lined up on a black desk, and their colors were compared. The difference (color difference) was confirmed when comparing the color tone of the prosthesis placed on the occlusal surface of the shade guide with the color tone of the prosthesis lined up on the black desk. After that, the difference (color difference) in color tone was visually confirmed for the A3.5 shade guide and the A3.5 prosthesis (A3.5-U-1) in the same way. We asked 10 dental professionals to check the color differences at this time and to choose one of the following two answers in response to the question, "Does the color of the prosthesis change between when it is adjacent to each shade guide and when it is on the desk, and does it have a color that is compatible with a wide range of shades?" [Y-1: It was possible to determine whether the color was compatible with a wide range of colors or not.] [Y-2: It was not possible to determine whether the color would suit a wide range of colors.]

[0142] For the above evaluation items, it is preferable that the number of people who answered [Y-1] that they were able to determine whether or not the color tone was compatible with a wide range of color tones is 6 / 10 or more, more preferably 8 / 10 or more, and even more preferably 10 / 10. In Comparative Example 1, since there was no detachable portion, the artificial tooth for restoration and the prosthesis could not be detached, so the above evaluation was equivalent to test Y in the examples. Evaluation as a demonstration kit was performed in the same manner as in Example 1.

[0143] [Comparative Example 2] Similarly to Example 1, artificial restorative teeth of shades B1 and A3.5 were fabricated. The missing parts of the restorative artificial teeth were etched using a dental etching material (product name "K Etchant GEL", manufactured by Kuraray Noritake Dental Co., Ltd.) according to the method recommended by the manufacturer. Next, a dental adhesive (trade name "Clearfil (registered trademark) Universal Bond Quick ER", manufactured by Kuraray Noritake Dental Co., Ltd.) was used to bond each defect area using the method recommended by the company, and a dental visible light irradiator (trade name "Pencure 2000", manufactured by Morita Co., Ltd.) was used to irradiate for 10 seconds in normal mode. Thereafter, dental composite resin 1 was built up on each defect area, and the surface shape of the artificial tooth for restoration was formed by pressing it down with a mold for the artificial tooth for restoration made in advance with a silicone impression material (Memosil (registered trademark) 2, manufactured by Kulzer Japan Co., Ltd.), and the mold was removed and irradiated for 10 seconds to obtain a cured product. The obtained hardened product was polished and polished in the same manner as in Example 1 to prepare a B1 restoration sample and an A3.5 restoration sample in which the artificial tooth for restoration and the prosthesis were integrated. Then, Test X was carried out in the same manner as in Example 1. After that, a prosthesis having the same shape as the prosthesis in the B1 sample was produced, and the color tones of the prostheses were confirmed when they were arranged on a black desk, and the difference (color difference) between the color tone and the color tone of the prosthesis in the B1 sample was confirmed. Ten dental professionals were asked to check the color difference at this time, and to select one of the two answers given in response to the question for Test Y, "Does the prosthesis have a color that changes between inside each artificial tooth and on the desk, and is compatible with a wide range of colors?" [Y-1: It was possible to determine whether the color was compatible with a wide range of colors or not.] [Y-2: It was not possible to determine whether the color would suit a wide range of colors.]

[0144] For the above evaluation items, it is preferable that the number of people who answered [Y-1] that they were able to determine whether or not the color tone was compatible with a wide range of color tones is 6 / 10 or more, more preferably 8 / 10 or more, and even more preferably 10 / 10. In Comparative Example 2 corresponding to Patent Document 1, the artificial tooth for restoration and the prosthesis could not be attached or detached, and therefore the evaluation of Test Y was not possible, and therefore the above evaluation was compared with the examples as an evaluation equivalent to Test Y in Example 1. Evaluation as a demonstration kit was performed in the same manner as in Example 1.

[0145] [Comparative Example 3] Hard resin teeth of shades B1 and A3.5 (product name "GC Zen Opal", molar No. 6 (size: mandibular 1 form, 4 size, PL16), manufactured by GC Corporation) were used as they were for restoring artificial teeth. Using a dental CAD / CAM machine (product name "DWX-51D", manufactured by Roland DG Corporation), a B1 prosthesis (B1-Ur) and an A3.5 prosthesis (A3.5-Ur), each in the shape of a rectangular parallelepiped with dimensions of 4.0 mm length x 6.0 mm width x 3.0 mm depth, were fabricated from a dental mill blank (U-1). First, the B1 prosthesis was placed on the occlusal surface of the B1 restoration artificial tooth, and the colors were compared to visually check the difference (color difference) between the color of the prosthesis and the color of the restoration artificial tooth. After that, the color difference (color difference) between the A3.5 restoration artificial tooth and the A3.5 prosthesis was also visually checked. Ten dental professionals were asked to check these color differences and to choose one of the following two answers in response to the question, "Was there a transitional change in color tone at the boundary between the prosthesis and each restorative artificial tooth?" [X-1: It was possible to determine whether the color tone was changing or not.] [X-2: Unable to determine if the color tone is transitioning.]

[0146] For the above evaluation items, a kit for judging color tone is preferably one in which the number of people who answered that they were able to determine whether or not there was a transitional change in color tone [X-1] is 6 / 10 or more, more preferably 8 / 10 or more, and even more preferably 10 / 10. In Comparative Example 3, the above evaluation was equivalent to Test X in Example 1, since the artificial tooth for restoration and the prosthesis did not have a detachable part.

[0147] Next, the B1 prosthesis was placed on the occlusal surface of the B1 restoration artificial tooth, and the difference in color tone (color difference) of each was visually confirmed. After that, the B1 restoration artificial tooth and the B1 prosthesis were lined up on a black desk, and the difference in color tone (color difference) of each was visually confirmed. This was repeated, and the difference (color difference) was confirmed when the color tone of the B1 prosthesis was placed on the occlusal surface of the B1 restoration artificial tooth and the color tone of the B1 prosthesis when placed side by side on a black desk. After that, the color difference was confirmed in the same way for the A3.5 restoration artificial tooth and the A3.5 prosthesis. We asked 10 dental professionals to check the color difference at this time and to choose one of the following two answers in response to the question, "Does the color of the prosthesis change between when it is adjacent to each restorative artificial tooth and when it is on the desk, and does it have a color that is compatible with a wide range of color tones?" [Y-1: It was possible to determine whether the color was compatible with a wide range of colors or not.] [Y-2: It was not possible to determine whether the color would suit a wide range of colors.]

[0148] For the above evaluation items, a kit for judging color tones is preferable if 6 / 10 or more people answered [Y-1] that they were able to determine whether or not the color tone was compatible with a wide range of colors, more preferably 8 / 10 or more, and even more preferably 10 / 10. In Comparative Example 3, the artificial tooth for restoration and the prosthesis did not have a detachable part, and therefore the evaluation of Test Y was not possible, and the above evaluation was compared with the examples as an evaluation equivalent to Test Y in Example 1. The evaluation as a demonstration kit was performed in the same manner as in Example 1.

[0149] [Table 2]

[0150] [Table 3]

[0151] [Table 4]

[0152] From Tables 2 to 4, it was confirmed that many dental care workers were able to fully understand each evaluation item using the demonstration kit of the present invention. From these findings, it was found that the present invention is a demonstration kit that enables efficient judgment of the color tone of dental restorative materials. It was also confirmed that the demonstration kit of the present invention is useful for determining whether or not a dental restorative material has color matching. In addition, as shown in Table 4, in the tests X and Y of Comparative Example 1, the kit of the prosthesis and the shade guide was unable to fit the prosthesis to perform simulated indirect restoration, and color compatibility could not be determined. As shown in Table 4, in Comparative Example 2, for Test Y, it was impossible to remove the prosthesis and the restorative artificial tooth, and it was impossible to compare the colors without imagining the color tone when the prosthesis was removed, so the color compatibility could not be determined. As shown in Table 4, in Comparative Example 3, for Tests X and Y, the prosthesis and the artificial tooth for restoration did not have detachable parts, so it was not possible to insert the prosthesis to perform simulated indirect restoration, and it was not possible to compare the color change when worn, so the color compatibility could not be determined.

[0153] As described above, in the Examples, the demonstration kit of the present invention was able to distinguish between cases with and without color matching. Therefore, as a modified example, even in an embodiment in which the demonstration kit of the present invention includes two or more prostheses in which two or more of the restorative artificial teeth have the same shade but different shades (for example, differing in the presence or absence of shade compatibility), it is presumed that it is possible to evaluate whether one of the prostheses has shade compatibility and the other does not. [Explanation of symbols]

[0154] 10 Walls of gaps or defects 20 Defective part 30 Restorative Teeth

Claims

1. A dental demonstration kit comprising two or more artificial teeth for repair having a defect portion and one or more prostheses made of a dental repair material, wherein the defect portions of the two or more artificial teeth for repair are all detachable portions (W) to which the prosthesis can be attached and detached, the prosthesis has a detachable portion (Z) that can be attached to and detached from the artificial tooth for repair on a surface facing the detachable portion (W), the prosthesis has a shape that can be fitted into the detachable portion (W) at the detachable portion (Z), and a plurality of repair samples formed by fitting the prosthesis and the artificial tooth for repair are different from each other.

2. The dental demonstration kit according to claim 1, wherein the plurality of repair samples are composed of any one of the following (i), (ii), or (iii). (i) Two or more of the artificial teeth for repair have different shades; or (ii) Two or more of the artificial teeth for repair have the same shade, and the kit includes two or more prostheses having different color tones; or (iii) Two or more of the artificial teeth for repair have the same shade, and the kit includes two or more prostheses having the same color tone.

3. The dental demonstration kit according to claim 2, which satisfies the condition (i) or (ii), and the shapes of the defect portions of the two or more artificial teeth for repair are the same or substantially the same.

4. The dental demonstration kit according to claim 2, which satisfies the condition (i) or (iii), and the shapes of the defect portions of the two or more artificial teeth for repair are different.

5. The dental demonstration kit according to claim 2, which satisfies the condition (i), and the shades of the artificial teeth for repair are two or more selected from the group consisting of A1, A2, A3, A3.5, A4, B1, B2, B3, B4, C1, C2, C3, C4, D2, D3, and D4.

6. The dental demonstration kit according to any one of claims 1 to 5, further comprising a coating agent.

7. The dental demonstration kit according to claim 6, wherein the coating agent contains a polymerization initiator, and the content of the polymerization initiator is 1000 ppm by mass or less.

8. The dental demonstration kit according to claim 6, wherein the coating agent contains a polymerizable monomer, and the content of the polymerizable monomer is 10000 ppm by mass or less.

9. The dental demonstration kit according to claim 6, wherein the transparency of the coating agent is ΔL10 or more.

10. The dental demonstration kit according to claim 6, wherein the coating agent is a dental color matching confirmation material or water.

11. The dental demonstration kit according to claim 10, wherein the L*a*b* color system of the dental color matching confirmation material is in the following range. L* / w = 70.0 to 110.0, a* / w = -5.0 to 15.0, and b* / w = -5.0 to 40.0

12. The dental demonstration kit according to claim 1, comprising only a prosthetic artificial tooth having the detachable part (W) and a prosthesis having the detachable part (Z).

13. The dental demonstration kit according to claim 1, wherein the dental restoration material is a dental mill blank or a dental composite resin.

14. The dental demonstration kit according to claim 1, wherein the defective part of the prosthetic artificial tooth is a Class II cavity.

15. A method for evaluating the color of a dental restoration material, comprising: in the dental demonstration kit according to claim 1, a step of fitting the detachable part (W-1) of the first prosthetic artificial tooth and the detachable part (Z) of the prosthesis to produce a first restoration sample; a step of removing the prosthesis from the first restoration sample; a step of fitting the detachable part (W-2) of the second prosthetic artificial tooth and the detachable part (Z) of the prosthesis to produce a second restoration sample; and a step of comparing the color of the first restoration sample and the color of the second restoration sample. A method for evaluating the color of a dental restoration material.

16. In the dental demonstration kit, the evaluation method according to claim 15, wherein two or more of the prosthetic artificial teeth have different shades from each other.

17. The evaluation method according to claim 15 or 16, wherein the detachable part (W-1) and the detachable part (Z), and / or the detachable part (W-2) and the detachable part (Z) are fitted through a coating agent.

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