Method for verifying the appearance color of a dental crown, kit of instruments, demonstration instrument and method for verifying the influence of the shape of an abutment on the appearance color of a dental crown

Abstract

A method for confirming the appearance color of a crown after the crown is installed on an abutment of a patient in advance, the crown being made by CAD / CAM using a milling block made of a non-metallic material and having a specific surface color matching pattern. An abutment portion (21) is inserted into an open hollow portion (11) using a kit (1) or a demonstration tool (30), and the appearance color of a crown sample (10) before and after the insertion is confirmed. The kit (1) or the demonstration tool (30) includes a crown sample (10) made by CAD / CAM using a milling block substantially identical to a milling block used to make the crown described above and having an open hollow portion, and an abutment sample (20) having an abutment portion (21) having a shape and size that can be freely inserted into the open hollow portion (11) and having a surface color matching pattern substantially identical to the color of the abutment of the patient.

Description

Technical Field

[0001] The present invention relates to a method for confirming the hue of a dental crown (crown) having a prescribed appearance color when it is actually installed on a patient's abutment tooth as a dental restoration made of a non-metallic material such as a mixed resin, an appliance kit applicable to the method, and a demonstration appliance including the appliance kit. Background Technology

[0002] Dental restorations used in dental treatment are typically formed by casting from metallic materials such as gold or silver, titanium, palladium alloys, or by processing non-metallic materials such as ceramics or mixed resins. They may also be formed by using a core of metallic materials and a surface layer such as a pre-fitting layer of non-metallic materials. Mixed resins (hereinafter also referred to as "HR") are composite materials in which inorganic filler materials (hereinafter also called "inorganic fillers") are highly dispersed in a resin matrix. They are usually obtained by pressing and heating a paste-like polymerizable curable composition containing polymerizable monomers, inorganic fillers, and polymerization initiators to polymerize and cure it.

[0003] Dental restorations made entirely of non-metallic materials not only offer advantages such as eliminating concerns about metal allergies and superior aesthetics, but also benefit from the ease of processing facilitated by advancements in digital imaging and computer processing technologies in recent years, leading to a rapid increase in demand. For example, as disclosed in Patent Document 1, CAD / CAM systems are widely used to shape dental restorations by machining a "CAD / CAM milling block" (also called a dental machining blank) made of non-metallic materials using a CAD / CAM device based on intraoral images and computer-aided design (CAD) and computer-aided manufacturing (CAM) technologies. Here, the CAD / CAM milling block refers to the workpiece (also called a milling blank) that can be mounted on a cutting machine within a CAD / CAM system, typically having a cutting portion and a holding portion for mounting it on the cutting machine. Furthermore, the cut-out part is usually known to be formed as a (solid) block in the shape of a cuboid or cylinder, or as a (solid) disc in the shape of a plate or disk. It is also known that the cut-out part is formed of a mixed resin (hereinafter, the CAD / CAM milling block formed by HR will also be referred to as "HR milling block").

[0004] However, for aesthetically pleasing restorations, it is necessary to determine the color of the tooth to be restored (the tooth being restored) or the surrounding teeth (specific to hue, lightness, and saturation, i.e., hue and tone). (Such color determination is sometimes called "shade taking"). An HR milling block with a suitable color for the cut portion is then selected for the restoration. Furthermore, the aforementioned shade taking is typically performed using a tooth tone sample called a shade guide. Various shade guides exist that are designed to facilitate color determination by expending effort in terms of the number of color samples or the structure of the device holding the color samples. However, the most widely used shade guide is the "VITA Classical" (trade name) manufactured by VITA, which consists of samples of all 16 colors (a combination of hue, lightness, and saturation, or a combination of hue, lightness, and saturation; hereinafter, the color specific to this combination will be referred to as "shade") and allows the color of the restoration site to be determined by comparing this shade guide with the color of the restoration site and surrounding teeth (see Patent Document 1). In addition, various shades of white, known as bleach shades, are sometimes used to simulate the whitening effect.

[0005] In addition, the VITA tooth color chart classifies colors in the A to D systems by lightness and represents them with symbols. That is, it classifies them into system A (reddish brown), system B (reddish yellow), system C (gray), and system D (reddish gray). If the 16 chromaticities are arranged in order of lightness (high lightness → low lightness), it is "B1→A1→B2→D2→A2→C1→C2→D4→A3→D3→B3→A3.5→B4→C3→A4→C4".

[0006] HR blanks can be either monochrome blanks where the cut portion consists of a single HR layer (hereinafter also referred to as "single-layer HR milling blocks") or blanks consisting of multiple HR layers of different colors (hereinafter also referred to as "layered HR milling blocks"). Typically, blanks are prepared with several chromaticities selected from the aforementioned 16 chromaticities as basic chromaticities (only the number of basic chromaticities). That is, for the surface color scheme of the cut portion of the HR milling block, in a single-layer HR milling block, the entire surface is composed of a specific basic chromaticity (color), while in a layered HR milling block, one of the layers constituting the stack has a specific basic chromaticity, and the other layers have chromaticities other than that basic chromaticity and / or colors other than the aforementioned 16 chromaticities. As a result, different specific colors are used to distinguish the layers according to their structure.

[0007] If a color match is performed and a harmonious shade is selected, a restoration (treatment) with less disharmony can be achieved even with a crown made using a single layer of HR milling blocks. However, for a highly aesthetic restoration that realistically reproduces the color changes of the tooth area, it is preferable to use a crown made using stacked HR milling blocks.

[0008] As examples of such stacked HR milling blocks, Patent Document 2 discloses a block for processing dental restorations that exhibits excellent aesthetics, superior mechanical strength even without special processing such as overlay treatment, long-term stable use, and excellent machinability such as cutting and grinding. Air bubbles do not remain inside the block. When the block is formed by overlapping multiple resin layers, the resin layers bond firmly together without the need for a pressure process, and it possesses a near-natural color tone and further enhanced aesthetics, imparting color depth. Furthermore, Patent Document 3 discloses a dental CAD / CAM resin block composed of a dentin restoration resin layer and an enamel restoration resin layer, as a cutting block for dental CAD / CAM that offers excellent versatility and manufacturability and high reproducibility of the aesthetics of natural teeth. At least the dentin restoration resin layer contains light-diffusing particles, and the contrast and diffusion ratio are adjusted within specific ranges. Moreover, Patent Document 4 discloses a stacked milled blank that offers both high aesthetics and high mechanical strength.

[0009] In addition, as a CAD / CAM milling block other than the HR milling block, which is formed of non-metallic material for the cut part, there is a so-called zirconia dental machining blank, but it is usually a single layer. In terms of selecting and using milling blocks from multiple shades by colorimetry, it is the same as the single-layer HR milling block.

[0010] Existing technical documents

[0011] Patent documents

[0012] Patent Document 1: Japanese Patent No. 6004769;

[0013] Patent Document 2: International Publication No. 2009 / 154301;

[0014] Patent document 3: Japanese Patent Application Publication No. 2017-213394;

[0015] Patent document 4: Japanese Patent Application Publication No. 2017-113224. Summary of the Invention

[0016] The problem the invention aims to solve

[0017] When dentists treat patients with crowns that serve as restorations for inserting into abutment teeth, the selection of a CAD / CAM milling block (dental machining blank) made of non-metallic material is usually based on the appearance color of the CAD / CAM milling block before cutting. However, there are many cases where the appearance color of the crown when viewed alone differs from the appearance color of the crown installed on the patient's abutment tooth. Furthermore, when a crown made using the selected CAD / CAM milling block is actually installed on the patient's abutment tooth (the tooth to be cut and shaped to fit the crown's form), the desired color harmony is often not achieved.

[0018] Therefore, the object of the present invention is to provide a method for pre-confirming the appearance color of a crown with a specific surface color pattern, which is manufactured by CAD / CAM using a milling block made of non-metallic material, after it has been installed on an abutment tooth; and an appliance kit, etc., applicable to the method.

[0019] Solution for solving the problem

[0020] This invention addresses the aforementioned problems. The first aspect of this invention is a method for confirming the appearance color, characterized in that...

[0021] The crown is a crown restoration with an opening cavity, formed using CAD / CAM with a milling block. The crown appearance color confirmation method pre-confirms the appearance color of the crown after the patient's abutment tooth is inserted into the opening cavity, including:

[0022] The preparation process involves preparing an instrument kit consisting of a combination of an abutment tooth sample and a crown sample. The abutment tooth sample has a surface color scheme identical to that of the abutment tooth and has an abutment portion formed in the standard shape of the abutment tooth. The crown sample has a surface color scheme identical to that of the crown tooth. It is formed in the standard shape of the crown using CAD / CAM with a milling block substantially identical to the milling block used to form the crown, and has an opening cavity corresponding to the abutment portion of the abutment tooth sample.

[0023] The confirmation process involves confirming the appearance and color of the crown sample before and after inserting it into the abutment portion of the tooth sample into the opening cavity of the crown sample.

[0024] In the confirmation process, images or image data of the appearance of the crown sample taken before and after inserting the abutment portion of the abutment tooth sample into the opening cavity of the crown sample may also be used.

[0025] The second aspect of the present invention is an appliance kit, characterized in that it comprises:

[0026] At least one abutment tooth sample, which is constituted as a sample of a patient's abutment tooth and has an abutment portion formed in the standard shape of said abutment tooth; and

[0027] At least one crown sample, which is a crown restoration having an opening cavity, is configured as a sample of a crown into which the abutment tooth is inserted, is formed in the standard shape of the crown, and has an opening cavity corresponding to the abutment portion of the abutment tooth sample.

[0028] The instrument kit includes at least one of multiple abutment tooth samples and multiple crown samples.

[0029] The plurality of abutment tooth samples constitute at least one of a first abutment tooth sample group and a second abutment tooth sample group. The abutment tooth portions of the first abutment tooth sample group have substantially the same shape, but different surface color patterns. The abutment tooth portions of the second abutment tooth sample group have substantially the same surface color patterns, but different shapes.

[0030] The plurality of crown samples constitute at least one of a first crown sample group and a second crown sample group. The first crown sample group has substantially the same shape and different surface color patterns. The second crown sample group has substantially the same surface color patterns and different shapes.

[0031] The surface color scheme of the at least one abutment tooth sample and the at least one crown sample can also be composed of multiple colors, including a color corresponding to one selected from 18 chromaticities representing tooth color.

[0032] The at least one crown sample can also be formed using CAD / CAM with a milling block made of a mixed resin or ceramic.

[0033] In the appliance kit, the at least one abutment tooth sample may also have a gripping portion that extends on the opposite side of the abutment tooth portion toward the insertion direction of the opening cavity portion.

[0034] The instrument kit is used to confirm in advance the appearance color of the crown after it is installed on the patient's abutment tooth. The crown is formed using CAD / CAM with a milling block that is substantially the same as the milling block used to form the crown sample.

[0035] The instrument kit may also include the first abutment tooth sample set and the first crown sample set.

[0036] The shape of the abutment portion of the plurality of abutment tooth samples constituting the first abutment tooth sample group corresponds one-to-one with the shape of the opening cavity portion of the plurality of crown samples constituting the first crown sample group.

[0037] The instrument kit may also include a second abutment tooth sample set and a second crown sample set.

[0038] The plurality of crown samples constituting the second crown sample group include a crown sample having the opening cavity portion, the shape of which corresponds to the complete shape of the abutment portion of the plurality of abutment samples constituting the second abutment sample group.

[0039] The third aspect of the present invention is a demonstration apparatus, characterized in that it is used to actually demonstrate the method for confirming the appearance and color of the tooth crown.

[0040] The demonstration apparatus includes the apparatus kit.

[0041] The number of the multiple crown samples is 2 to 18.

[0042] The plurality of crown samples are arranged in a manner that allows the abutment portion of the abutment sample to be inserted into the opening cavity.

[0043] The fourth aspect of the present invention is a method for selecting a milling block, characterized in that a milling block is selected for forming a dental crown using CAD / CAM, wherein the dental crown is a dental crown restoration having an opening cavity, and the selection method includes:

[0044] Preparation process: Prepare the aforementioned equipment kit;

[0045] In the selection process, a tooth sample with a tooth portion that is similar to the shape and surface color pattern of the patient's tooth is selected from the first tooth sample group;

[0046] The confirmation process involves, for each of the plurality of crown samples constituting the first crown sample group, confirming the appearance color of the abutment portion after insertion into the opening cavity of the abutment tooth sample selected in the selection process; and

[0047] In the selection process, from the plurality of crown samples constituting the first crown sample group, a crown sample whose appearance color, as confirmed in the confirmation process, best matches the appearance color of the patient's teeth is selected, and a milling block substantially the same as the milling block used to form the determined crown sample is selected.

[0048] In the confirmation process, images or image data of the appearance of the multiple crown samples taken before and after inserting the abutment portion of the abutment tooth sample into the opening cavity of the multiple crown samples can be used.

[0049] The fifth aspect of the present invention is a confirmation method, characterized in that, at a stage where the surface color pattern of the abutment tooth has been confirmed but the shape has not been determined, when selecting a milling block for forming the crown using CAD / CAM, the influence of the shape of the abutment tooth on the appearance color of the crown formed using the candidate milling block is confirmed, wherein the crown is a crown restoration having an opening cavity for insertion into the abutment tooth, and the confirmation method includes:

[0050] The preparation process includes preparing an instrument kit in which the surface color pattern of the abutment portion of the plurality of abutment samples constituting the second abutment sample group is substantially the same as or similar to the surface color pattern of the abutment tooth; and the plurality of crown samples constituting the second crown sample group are formed using a milling block substantially the same as the candidate milling block; and

[0051] In the confirmation process, for each combination of crown and abutment samples with corresponding shapes selected from the second crown sample group and the second abutment sample group, the appearance color of the abutment sample inserted into the opening cavity after insertion into the opening cavity is confirmed.

[0052] In the confirmation process, images or image data of the appearance of the crown sample taken before and after inserting the abutment portion of the abutment tooth sample into the opening cavity of the crown sample may also be used.

[0053] Invention Effects

[0054] According to the method for confirming the appearance color of a crown according to the present invention, for example, using a tooth sample having a chromaticity (color) determined by color matching with the patient's abutment tooth portion, the appearance color is confirmed in advance by inserting the tooth sample into the opening cavity of the crown sample. This allows confirmation of the chromaticity suitability of the crown fabricated using CAD / CAM with a milling block substantially identical to the one used to fabricate the crown sample, during treatment. Therefore, the actual finished product can be predicted, and the milling block to be used in CAD / CAM can be selected. Attached Figure Description

[0055] Figure 1 These are front view, top view, bottom view, right view, and longitudinal section view of a representative dental crown sample from the appliance kit of the present invention.

[0056] Figure 2 This is a right view of two representative abutment tooth samples from the appliance kit of the present invention.

[0057] Figure 3 A photograph of a demonstration apparatus for one embodiment of the present invention.

[0058] Figure 4 To indicate in Figure 3 The photograph shown illustrates the state in which the abutment portion of the abutment tooth sample is inserted into the opening cavity of the crown sample using the demonstration apparatus.

[0059] Figure 5 Photographs of the first set of abutment tooth samples suitable for use in the demonstration apparatus of the present invention.

[0060] Figure 6 A photograph of a demonstration apparatus for another embodiment of the present invention. Detailed Implementation

[0061] The inventors believe that the reason why crowns manufactured using CAD / CAM with pre-selected milling blocks selected for color matching cannot achieve the desired color harmony during installation is that: (1) the appearance of the color is affected by the thickness of the material; and (2) since non-metallic materials have a certain degree of translucency even when stained, if the material is thin, the base color will show through, causing a change in the appearance color. Furthermore, for crown samples machined to the same shape as the actual crown, if the appearance color when installed on a base tooth sample that matches the color of the patient's actual base tooth can be confirmed, the appearance color during actual restoration (treatment) can be reliably evaluated. Based on this consideration, a method for simple and reliable confirmation of this method was studied. This invention was completed through such research.

[0062] The milling block used for evaluation is not particularly limited as long as the cut portion is made of a non-metallic material. From the viewpoint of effectiveness, it is preferable to be made of composite resin (HR) or ceramics such as zirconia. In particular, from the viewpoint of being able to achieve highly aesthetic restorations, laminated HR milling blocks are particularly preferred, and EMD-type laminated HR milling blocks composed of enamel layer E, intermediate HR layer M, and dentin layer D are most preferred. Here, enamel layer E refers to an HR layer having a color corresponding to the appearance color of the enamel portion where dentin is absent in the substrate. Dentin layer D refers to an HR layer having a color corresponding to the appearance color of the enamel portion where dentin is present in the substrate. Intermediate HR layer M refers to an HR layer having an intermediate color between enamel layer E and dentin layer D. In addition, intermediate HR layer M is usually composed of 1 to 3 layers. When intermediate HR layer M is composed of 2 or 3 layers, it is preferable that the colors of each intermediate HR layer M are different from each other and are laminated in a gradient manner.

[0063] Furthermore, the crowns that are the subject of this invention can be any type of incisor, canine, premolar, or molar, but from the viewpoint that a high degree of aesthetic restoration is required and the effect of this invention is also high, the crowns of incisors are preferred.

[0064] The method for confirming the appearance color of a dental crown according to the present invention includes a preparation step and a confirmation step. In the preparation step, the instrument kit 1 of the present invention or the demonstration instrument 30 of the present invention is prepared. The method for confirming the appearance color of a dental crown according to the present invention can also be described as a method of using the instrument kit 1 of the present invention or the demonstration instrument 30 of the present invention. Furthermore, the demonstration instrument 30 of the present invention includes the instrument kit 1 of the present invention. The instrument kit 1, as the instrument it constitutes, is composed of a combination of an abutment tooth sample 20 and a dental crown sample 10. The surface color pattern of the abutment tooth sample 20 is substantially the same as that of the patient's abutment tooth, and it has an abutment portion 21 formed into a standard shape of an abutment tooth. The surface color pattern of the dental crown sample 10 is substantially the same as that of a dental crown, and it is formed into a standard shape of a dental crown using CAD / CAM with a milling block substantially the same as that used to form the dental crown, and it is provided with an opening cavity portion 11 corresponding to the abutment portion 21 of the abutment tooth sample 20. Here, in the present invention, "substantially the same" means a structure obtained based on the same design, and structures with only unavoidable differences in manufacturing processes are also included in "substantially the same". In the confirmation process, the appearance color of the crown sample 10 before and after inserting the abutment tooth portion 21 of the abutment tooth sample 20 into the opening cavity 11 of the crown sample 10 constituting the appliance kit 1 is confirmed. The crown appearance color confirmation method of the present invention can include: a practical confirmation method by visually confirming the appearance color of the crown sample 10 in the confirmation process, and an image confirmation method using images or image data of the appearance of the crown sample 10 taken before and after inserting the abutment tooth portion 21 of the abutment tooth sample 20 into the opening cavity 11 of the crown sample 10 in the confirmation process. In the image confirmation method, catalog photographs, moving images, etc., representing the appearance of the crown sample 10 can be used as images or image data. As described above, in the crown appearance color confirmation method of the present invention, the appearance color of the crown formed by CAD / CAM using a milling block substantially identical to the milling block used to form the crown sample 10, after installation on the patient's abutment tooth, can be confirmed in advance. The following description, taking the case of confirming the appearance color of a front tooth crown made using an EMD-type stacked HR milling block after installation as an example, with reference to the accompanying drawings and the description of the demonstration apparatus 30 of the present invention, will explain the apparatus kit 1 of the present invention and the crown appearance color confirmation method of the present invention.

[0065] Figure 3 and Figure 4 The demonstration apparatus 30 shown (all photographs) is a representative form of the demonstration apparatus 30 of the present invention, including apparatus kit 1, plate 32, and box 33. The apparatus kit 1 of the present invention is composed of a combination of at least one crown sample 10 and at least one abutment tooth sample 20. Figure 3 and Figure 4The appliance kit 1 shown consists of a first crown sample group 31a and an abutment tooth sample 20. The first crown sample group 31a consists of multiple crown samples 10. Specifically, the first crown sample group 31a consists of five crown samples 10 that are substantially the same in shape but have different surface color patterns.

[0066] Here, the crown sample 10 is a sample of a crown that has been processed into a standard shape for use as a crown restoration for inserting into a base tooth with an opening cavity, and is constituted as a sample of a crown. The crown sample 10 has an opening cavity 11 that corresponds to the opening cavity of the crown. Figure 1 The diagram shows the front view, top view, bottom view, right view, and longitudinal section view of a representative dental crown sample 10. Figure 1 In the longitudinal sectional view, the crown sample 10 is shown as a cross-section along the XY lines of the front view. In the crown sample 10, the opening cavity 11 is configured as a cavity that opens only at the top and is closed laterally and at the bottom. Furthermore, the crown sample 10 has a surface 12 facing the front when installed on the patient's abutment tooth. Additionally, a retaining portion, such as a base for holding the crown sample 10 on a plate 32 in a predetermined state, may also be provided on the crown sample 10.

[0067] The crown sample 10 is typically fabricated using CAD / CAM with milling blocks made of non-metallic materials, thus forming a surface color scheme that reflects the color pattern of the milling blocks used. Here, in this invention, a surface color scheme refers to the pattern of the surface's appearance color, specifically the color scheme of a surface that is a single color overall and that is distinguished by multiple distinct colors. In other words, a surface color scheme refers to the arrangement of colors on the surface; more specifically, it refers to the portion of the surface occupied by each color when using multiple colors, i.e., the colored pattern, including cases where the entire surface is composed of a single color. The surface color scheme of the crown sample 10 preferably uses multiple colors, including a color corresponding to one selected from 18 chromaticities representing the color of teeth.

[0068] also, Figure 2 (a) and Figure 2(b) shows a right view of two representative abutment tooth samples 20. The abutment tooth sample 20 has an abutment portion 21 formed as a standard shape for a patient's abutment tooth and constitutes a sample of an abutment tooth made of artificial material. The abutment portion 21 corresponds to the opening cavity 11 of the crown sample 10 and has a shape and size that allows free insertion into the opening cavity 11, while its surface color pattern is substantially the same as the color of the abutment tooth. If the abutment portion 21 is used, its surface color is substantially the same as the color of the patient's abutment tooth, allowing prior confirmation of the appearance color when the crown is installed on the patient's abutment tooth. The surface color pattern of the abutment portion 21 preferably uses a variety of colors, including a color corresponding to one selected from 18 chromaticities representing tooth color. Furthermore, the abutment tooth sample 20 preferably has a grasping portion 22. The grasping portion 22 extends on the side opposite to the insertion direction of the abutment portion 21 toward the opening cavity 11 of the crown sample 10. The gripping part 22 improves convenience when manipulating the abutment tooth sample 20; for example, the abutment tooth sample 20 can be manually and freely manipulated by pinching the gripping part 22 with one's fingers. The shape of the gripping part 22 is not particularly limited as long as it achieves this purpose. For example, in... Figure 2 In the abutment tooth sample 20 shown in (a), a gripping part 22, which is a rod-shaped component different from the abutment tooth portion 21, is installed on the abutment tooth portion 21. Figure 2 In the abutment tooth sample 20 shown in (b), the gripping part 22 is integrally formed with the abutment tooth part 21 and is configured as a protruding tab protruding from the abutment tooth part 21.

[0069] As mentioned above, when HR blanks are sold as commodities, they are usually prepared in multiple HR blanks of the same specifications but with different surface color patterns. They are also prepared in several grades with different color gradations (surface color patterns) and sold as commodities, allowing customers to choose the surface color pattern when purchasing. Figure 3 and Figure 4 The demonstration apparatus 30 shown has a first crown sample group 31a with substantially the same shape and different surface color patterns. Therefore, for such a product, it is preferred as a tool for comparing the appearance color (when made into crowns and installed) between HR blanks of different grades.

[0070] Figure 3 and Figure 4 The appliance kit 1 shown consists of a combination of a first crown sample group 31a and an abutment tooth sample 20. The first crown sample group 31a consists of five crown samples 10, each of which has an opening cavity 11 with the same or substantially the same shape, and the surface color patterns are different from each other. Figure 3 and Figure 4The five crown samples 10 shown were made using EMD-type laminated HR milling blocks with different shades of dentin layer D and intermediate HR layer M, and the same shade of enamel layer E. Therefore, the surface color matching pattern of each crown sample 10 also reflects their differences. Furthermore, the shades of dentin layer D in each crown sample 10 are A1, A2, A3, A3.5, and A4 from left to right. Additionally, the number of crown samples 10 constituting the first crown sample group 31a with the same shape but different colors is 2 to 18 (the upper limit of 18 is obtained by adding a whitening-simulated shade number 2, called bleaching shade, to the number of vita shades 16). Generally, comparisons are made using the same system color or two system colors. In such cases, the number of crown samples 10 constituting the first crown sample group 31a is preferably 2 to 9, and particularly preferably 3 to 7.

[0071] In addition, Figure 3 and Figure 4 In the device kit 1 of the present invention shown in the manner, a single abutment tooth sample 20 is used, but a first abutment tooth sample group 31b consisting of two or more abutment tooth samples 20 that are the same or substantially the same in size and shape and have different surface color patterns may also be used. Figure 5 This is a diagram of example first abutment tooth sample group 31b. Figure 5 In the first abutment tooth sample group 31b shown, the color values ​​of the five abutment tooth samples 20, from left to right, are A1, A2, A3, A3.5, and A4. (Composition) Figure 5 All five abutment tooth samples 20 in the first abutment tooth sample group 31b shown have Figure 2 The structure shown in (b). Furthermore, in Figure 5 In the first abutment tooth sample group 31b shown, five abutment tooth samples 20 are held together by passing through a rope through a loop-shaped hook provided in each gripping part 22.

[0072] Furthermore, the plate 32 included in the demonstration apparatus 30 functions as a backing paper for arranging and holding the crown samples 10. Its material is not particularly limited; it can be made of rigid paper, polyethylene, polypropylene, acrylonitrile butadiene styrene (ABS resin), polycarbonate, or other synthetic resins, or metals such as stainless steel. Based on its ease of processing, light weight, and non-corrosiveness, it is preferably made of synthetic resins such as polypropylene. Moreover, it does not necessarily have to be a rigid plate; it can also be a flexible sheet. In the case of such a sheet, it is preferable to use it as a backing paper for a rigid box 33 or the like. On the display surface, which is the main surface of the plate 32, the crown samples 10 are arranged in a state where the abutment portion 21 of the abutment tooth sample 20 can be inserted into the opening cavity portion 11 without changing its posture, and are then fixedly held. Specifically, to easily confirm the appearance and color of the crown sample 10 before and after insertion of the abutment tooth sample 20, it is configured and fixed in the following manner: the frontal surface 12 of the crown sample 10 faces the surface side, its back surface is opposite to the display surface of the plate 32, and the opening cavity 11 faces upward so that the abutment tooth sample 20 can be freely inserted into the opening cavity 11 of the crown sample 10. The color of the plate 32 is not particularly limited, but for the purpose of displaying the color state in the oral cavity, it is preferably black or a dark color other than black.

[0073] The size of the plate 32 is appropriately determined according to the number and arrangement of the held dental crown samples 10, and is typically 2 to 10 cm in length, 2 to 15 cm in width, and 0.1 to 5 mm in thickness, preferably 2.5 to 6 cm in length, 2.5 to 8 cm in width, and 0.3 to 2 mm in thickness. Furthermore, it is preferable to provide an explanatory display section 36 on the display surface of the plate 32 for displaying information related to the held dental crown samples 10 (e.g., information about the milling blocks used specifically in manufacturing the dental crown samples using CAD / CAM, such as product name, grade, model, etc.).

[0074] The crown sample 10 is typically held on the display surface of the plate 32 using adhesive bonding, but it can also be held using a retaining unit for detachable retention of the crown sample 10. Using such a retaining unit allows for proper replacement and retention of the desired crown sample 10 on a single plate 32, facilitating quick comparisons and confirmations based on various viewpoints. Such a retaining unit can typically be configured as a detachable combination of a unit disposed on the display surface of the plate 32 (one retaining unit) and a unit disposed on the crown sample 10. Examples of such retaining units include, for example, tape, Velcro, snaps, various one-touch connectors, or one-touch terminals.

[0075] The demonstration apparatus 30 of this embodiment, for example, uses a milling block as a commercial product to create a dental crown sample 10 via CAD / CAM. This allows for the demonstration of color fit when a dental crown made using this product is actually installed in a real demonstration, thus making it useful as a promotional or advertising tool for the product. In cases used for this purpose, such as... Figure 3 As shown, the plate 32 holding the crown sample 10 and the abutment tooth sample 20 are preferably stored in a dedicated box 33. Figure 3 In the demonstration apparatus 30 shown, the box 33 has a structure in which the main body 34 and the cover 35 are connected freely by a hinge. Inside the box 33, a retaining mechanism 37 for holding the abutment tooth sample 20 is provided on the inner side of the cover 35, and a plate 32 for holding the crown sample 10 is housed inside the main body 34. Figure 4 As shown, in the demonstration apparatus 30, the abutment portion 21 of the abutment tooth sample 20 can be inserted into the opening cavity 11 of the crown sample 10 by pinching the gripping part 22 with the cover 35 open (without removing the plate 32). Furthermore, in Figure 4 In the middle, the appearance color of the crown sample 10, which is the second one from the left, "A2-LY" (meaning it was made using an EMD type laminated HR milling block with a chromaticity of D and A2), changes to a slightly reddish tint after being inserted into the abutment portion 21 of the abutment tooth sample 20, compared to before insertion.

[0076] The above description describes an instrument kit 1 using a first crown sample group 31a consisting of five crown samples 10 and one abutment tooth sample 20, but the instrument kit 1 of the present invention is not limited thereto. For example, not only one abutment tooth sample 20 may be prepared, such as... Figure 5 As shown, a first abutment tooth sample group 31b is also prepared, wherein the shapes of the abutment tooth portions 21 are substantially the same, but the surface color patterns of the abutment tooth portions 21 are different from each other. This allows confirmation of the appearance color when the crown is installed on abutment teeth of various colors. Of course, the abutment tooth samples 20 constituting the first abutment tooth sample group 31b are not limited to... Figure 2 The structure shown in (b) can also be Figure 2 The structure shown in (a).

[0077] constitute Figure 6 The apparatus kit 1 of the demonstration apparatus 30 shown uses Figure 2 The abutment tooth sample 20 with the structure shown in (a) contains 18 crown samples 10 with different surface color patterns as the first crown sample group 31a in a dedicated box 33, and also contains 18 abutment tooth samples 20 with color corresponding to each crown sample 10 as the first abutment tooth sample group 31b. Figure 6The demonstration instrument 30, serving as a crown sample 10, allows surgeons to select the most suitable shade for the patient by displaying a large number of shades simultaneously within the main body 34. Furthermore, by holding the abutment tooth sample 20 corresponding to each shade inside the cover 35, the correct shade selection can be made quickly while considering the patient's abutment tooth shade. Since different shades can be confirmed by combining crowns and abutment teeth, even requests from patients who, for example, desire whiter crowns, can be handled smoothly. Including, etc. Figure 6 In the instrument kit 1 of the first crown sample group 31a and the first abutment sample group 31b shown, preferably the shape of the opening cavity portion 11 of the plurality of crown samples 10 constituting the first crown sample group 31a corresponds one-to-one with the shape of the abutment portion 21 of the plurality of abutment samples 20 constituting the first abutment sample group 31b.

[0078] Furthermore, the appliance kit 1 of the present invention may also be configured to replace the first crown sample group 31a, or, in addition to the first crown sample group 31a, include a second crown sample group composed of multiple crown samples 10 with substantially the same surface color pattern and different shapes. Furthermore, the appliance kit 1 of the present invention may also be configured to replace the first abutment sample group 31b, or, in addition to the first abutment sample group 31b, include a second abutment sample group composed of multiple abutment samples 20 with substantially the same surface color pattern for the abutment portion 21 and different shapes for the abutment portion 21. In this case, the appliance kit 1 of the present invention can be configured such that the number of crown samples 10 constituting the second crown sample group is the same as the number of abutment samples 20 constituting the second abutment sample group, and the shape and size of the abutment portion 21 of the multiple abutment samples 20 constituting the second abutment sample group correspond one-to-one with the shape and size of the opening cavity portion 11 of the multiple crown samples 10 constituting the second crown sample group. In other words, in such an instrument kit 1, it is also possible to include, among the multiple crown samples 10 constituting the second crown sample group, a crown sample 10 having an opening cavity portion 11 with a shape corresponding to the shape of all the abutment portions 21 of the multiple abutment tooth samples 20 constituting the second abutment tooth sample group. By using the instrument kit 1 in this way, it is possible to know, for example, the influence of factors on the appearance color during installation when crowns of different shapes or wall thicknesses are made using an HR milling block.

[0079] Furthermore, by using the instrument kit 1 of the present invention or the demonstration instrument 30 of the present invention, a method for selecting a milling block can be provided, which selects a milling block for forming a crown as a crown restoration with an opening cavity by CAD / CAM. The method for selecting a milling block of the present invention includes a preparation step, a selection step, a confirmation step, and a selection step. In the preparation step, the instrument kit 1 or the demonstration instrument 30, which includes a first crown sample group 31a and a first abutment tooth sample group 31b, is prepared. In the selection step, an abutment tooth sample 20 having an abutment tooth portion 21 that is similar to the shape and surface color pattern of the patient's abutment tooth is selected from the first abutment tooth sample group 31b. In the confirmation step, for each of the plurality of crown samples 10 constituting the first crown sample group 31a, the appearance color after the abutment tooth portion 21 of the abutment tooth sample 20 selected in the above selection step is confirmed. In the confirmation process, images or image data of the appearance of the multiple crown samples 10 taken before and after inserting the abutment portion 21 of the abutment tooth sample 20 into the opening cavity 11 of the multiple crown samples 10 can be used. In the selection process, from the multiple crown samples 10 constituting the first crown sample group 31a, the crown sample 10 whose appearance color, as confirmed in the above confirmation process, is most suitable for the appearance color of the patient's teeth is selected, and a milling block substantially the same as the milling block used to form the determined crown sample 10 is selected.

[0080] Furthermore, by using the instrument kit 1 or the demonstration instrument 30 of the present invention, a confirmation method can be provided that, at a stage where the surface color pattern of the abutment tooth has been confirmed but the shape has not been determined, when selecting a milling block for forming the crown using CAD / CAM, the influence of the shape of the abutment tooth on the appearance color of the crown formed using the candidate milling block can be confirmed. The crown is a crown restoration having an opening cavity for insertion into the abutment tooth. The confirmation method of the present invention includes a preparation step and a confirmation step. In the preparation step, the instrument kit 1 or the demonstration instrument 30 is prepared, which includes a second crown sample group and a second abutment tooth sample group. The surface color pattern of the abutment portion 21 of the plurality of abutment tooth samples 20 constituting the second abutment tooth sample group is substantially the same as or similar to the surface color pattern of the abutment tooth. The plurality of crown samples 10 constituting the second crown sample group are formed using a milling block substantially the same as the candidate milling block. In the verification process, for each combination of crown sample 10 and abutment sample 20 selected from the second crown sample group and the second abutment sample group, having corresponding shapes of opening cavity portion 11 and abutment portion 21, the appearance color after the abutment portion 21 of the abutment sample 20 is inserted into the opening cavity portion 11 is verified. In the verification process, images or image data of the appearance of multiple crown samples 10 taken before and after inserting the abutment portion 21 of the abutment sample 20 into the opening cavity portion 11 of multiple crown samples 10 can be used, for example.

[0081] Explanation of reference numerals in the attached figures

[0082] 1: Equipment kit

[0083] 10: Dental crown sample

[0084] 11: Opening cavity

[0085] 12: Surface

[0086] 20: Abutment tooth sample

[0087] 21: Abutment part

[0088] 22: Grasp Department

[0089] 30: Demonstration equipment

[0090] 31a: First crown sample group

[0091] 31b: First abutment tooth sample group

[0092] 32: board

[0093] 33: Box

[0094] 34: Box body

[0095] 35: cover

[0096] 36: Explanation of the display section

[0097] 37: Maintain the organization

Claims

1. A method for confirming the appearance color of a dental crown, characterized by using an instrument kit consisting of a combination of an abutment tooth sample and a crown sample to pre-confirm the appearance color after the patient's abutment tooth is inserted into the opening cavity of the crown. The abutment tooth sample is constructed as a sample of the patient's abutment tooth and has an abutment portion formed in the standard shape of an abutment tooth. The crown sample is constructed as a sample of the patient's crown and is formed in the standard shape of a crown. The patient crown is a dental restoration with an opening cavity into which the patient's abutment tooth is inserted. The patient crown is formed using CAD / CAM with a milling block having a cuttable portion formed of a mixed resin. The method for confirming the appearance and color of the tooth crown includes: The preparation process includes preparing the instrument kit, wherein the surface color pattern of the abutment portion of the abutment tooth sample is identical to that of the patient's abutment tooth, and the crown sample is formed using CAD / CAM with a milling block substantially identical to that used to form the patient's crown, and has an opening cavity corresponding to the abutment portion of the abutment tooth sample; the surface color pattern of the crown sample is substantially identical to that of the patient's crown. The confirmation process involves confirming the appearance and color of the crown sample before and after inserting it into the abutment portion of the tooth sample into the opening cavity of the crown sample.

2. The method for confirming the appearance and color of a tooth crown according to claim 1, wherein, In the confirmation process, images or image data of the appearance of the crown sample taken before and after inserting the abutment portion of the abutment tooth sample into the opening cavity of the crown sample are used.

3. An appliance kit, characterized in that, include: At least one abutment tooth sample, which is constituted as a sample of the patient's abutment tooth, and has an abutment tooth portion formed in the standard shape of an abutment tooth; as well as At least one crown sample is constituted as a sample for a patient crown, which is a crown restoration with an opening cavity into which the abutment tooth is inserted. The crown sample is formed into a standard crown shape using a milling block via CAD / CAM, and has an opening cavity corresponding to the abutment portion of the abutment tooth sample. The milling block has a cutting portion formed of a mixed resin. The instrument kit is used to pre-confirm the appearance color after the patient's abutment tooth is inserted into the opening cavity of the patient crown, which is formed using CAD / CAM with a milling block substantially the same as the milling block used to form the crown sample. The instrument kit includes at least one of multiple abutment tooth samples and multiple crown samples. The plurality of abutment tooth samples constitute at least one of a first abutment tooth sample group and a second abutment tooth sample group. The abutment tooth portions of the first abutment tooth sample group have substantially the same shape, but different surface color patterns. The abutment tooth portions of the second abutment tooth sample group have substantially the same surface color patterns, but different shapes. The plurality of crown samples constitute at least one of a first crown sample group and a second crown sample group. The first crown sample group has substantially the same shape and different surface color patterns. The second crown sample group has substantially the same surface color patterns and different shapes.

4. The appliance kit according to claim 3, wherein, The surface color scheme of the at least one abutment tooth sample and the at least one crown sample is composed of multiple colors, which include a color corresponding to one selected from 18 chromaticities representing tooth color.

5. The appliance kit according to claim 3, wherein, The at least one abutment tooth sample also has a gripping portion that extends on the opposite side of the abutment tooth portion toward the insertion direction of the opening cavity portion.

6. The appliance kit according to claim 3, wherein, Including the first abutment tooth sample group and the first crown sample group, The shape of the abutment portion of the plurality of abutment tooth samples constituting the first abutment tooth sample group corresponds one-to-one with the shape of the opening cavity portion of the plurality of crown samples constituting the first crown sample group.

7. The appliance kit according to claim 3, wherein, Including the second abutment tooth sample group and the second crown sample group, The plurality of crown samples constituting the second crown sample group include a crown sample having the opening cavity portion, the shape of which corresponds to the complete shape of the abutment portion of the plurality of abutment samples constituting the second abutment sample group.

8. A demonstration apparatus, characterized in that, This is used to demonstrate the method for confirming the appearance and color of the tooth crown as described in claim 1. The demonstration apparatus includes the apparatus kit as described in claim 3. The number of the multiple crown samples is 2 to 18. The plurality of crown samples are arranged in a manner that allows the abutment portion of the abutment sample to be inserted into the opening cavity.

9. A method for selecting milling blocks, characterized in that the selection is for forming by CAD / CAM. Patient use A milling block used for dental crowns, wherein the patient-use dental crown is a crown restoration with an opening cavity, the milling block having a cuttable portion formed of a mixed resin, the selection method comprising: Preparation process: preparing the appliance kit as described in claim 6; In the selection process, a tooth sample with a tooth portion that is similar to the shape and surface color pattern of the patient's tooth is selected from the first tooth sample group; In the confirmation process, for each of the plurality of crown samples constituting the first crown sample group, the appearance color after the abutment portion of the abutment sample selected in the selection process is inserted into the opening cavity portion is confirmed. as well as The selection process involves determining, from the plurality of crown samples constituting the first crown sample group, the crown sample whose appearance color, as confirmed in the confirmation process, best matches the appearance color of the patient's teeth, and selecting a milling block substantially the same as the milling block used to form the determined crown sample.

10. The method for selecting a milling block according to claim 9, wherein, In the confirmation process, images or image data of the appearance of the plurality of crown samples are taken before and after inserting the abutment portion of the abutment tooth sample into the opening cavity of the plurality of crown samples.

11. A method for confirming the influence of the shape of an abutment tooth on the appearance color of a crown, characterized in that, at a stage where a surface color pattern has been confirmed for a patient's abutment tooth but the shape has not been determined, when selecting a milling block for forming a patient crown using CAD / CAM, the method confirms the influence of the shape of the abutment tooth on the appearance color of the patient crown formed using the candidate milling block, the patient crown being a crown restoration having an opening cavity for insertion into the abutment tooth, the milling block having a cuttable portion formed of a mixed resin, the method for confirming the influence of the shape of the abutment tooth on the appearance color of the crown comprising: The preparation process involves preparing the instrument kit as described in claim 7, wherein the surface color pattern of the abutment portion of the plurality of abutment samples constituting the second abutment sample group is substantially the same as or similar to the surface color pattern of the abutment tooth, and the plurality of crown samples constituting the second crown sample group are formed using a milling block substantially the same as the candidate milling block; as well as In the confirmation process, for each combination of crown sample and abutment sample selected from the second crown sample group and the second abutment sample group respectively, the appearance color of the abutment portion of the abutment sample after insertion into the opening cavity is confirmed. The crown sample and the abutment sample have corresponding shapes for the opening cavity and the abutment portion respectively. By comparing the appearance color of the confirmed combinations, the influence of the shape of the abutment on the appearance color of the patient crown formed using the candidate milling block is confirmed.

12. The method for confirming the influence of the shape of the abutment tooth on the appearance and color of the crown according to claim 11, wherein, In the confirmation process, images or image data of the appearance of the crown sample taken before and after inserting the abutment portion of the abutment tooth sample into the opening cavity of the crown sample are used.

Images