WO2023032728A1 - クラウン外観色確認方法、器具キット及びデモンストレーション用器具 - Google Patents
クラウン外観色確認方法、器具キット及びデモンストレーション用器具 Download PDFInfo
- Publication number
- WO2023032728A1 WO2023032728A1 PCT/JP2022/031526 JP2022031526W WO2023032728A1 WO 2023032728 A1 WO2023032728 A1 WO 2023032728A1 JP 2022031526 W JP2022031526 W JP 2022031526W WO 2023032728 A1 WO2023032728 A1 WO 2023032728A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- crown
- abutment tooth
- sample
- abutment
- samples
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 46
- 238000012790 confirmation Methods 0.000 title claims description 50
- 238000003780 insertion Methods 0.000 claims abstract description 12
- 230000037431 insertion Effects 0.000 claims abstract description 12
- 238000004040 coloring Methods 0.000 claims description 25
- 239000003086 colorant Substances 0.000 claims description 18
- 229920005989 resin Polymers 0.000 claims description 14
- 239000011347 resin Substances 0.000 claims description 14
- 230000008569 process Effects 0.000 claims description 10
- 238000002360 preparation method Methods 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 6
- 239000000919 ceramic Substances 0.000 claims description 4
- 238000003384 imaging method Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 abstract description 4
- 229910052755 nonmetal Inorganic materials 0.000 abstract description 2
- 238000003801 milling Methods 0.000 abstract 3
- 239000010410 layer Substances 0.000 description 27
- 235000019646 color tone Nutrition 0.000 description 15
- 239000007769 metal material Substances 0.000 description 12
- 210000004268 dentin Anatomy 0.000 description 8
- 238000011282 treatment Methods 0.000 description 7
- 210000003298 dental enamel Anatomy 0.000 description 6
- 238000005520 cutting process Methods 0.000 description 5
- 239000002356 single layer Substances 0.000 description 5
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 239000011256 inorganic filler Substances 0.000 description 3
- 229910003475 inorganic filler Inorganic materials 0.000 description 3
- 239000007844 bleaching agent Substances 0.000 description 2
- 239000013065 commercial product Substances 0.000 description 2
- 238000011960 computer-aided design Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 2
- 238000010187 selection method Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- 230000002087 whitening effect Effects 0.000 description 2
- 229910001316 Ag alloy Inorganic materials 0.000 description 1
- 229910001020 Au alloy Inorganic materials 0.000 description 1
- 229910001252 Pd alloy Inorganic materials 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 239000012237 artificial material Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 210000003464 cuspid Anatomy 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 210000000887 face Anatomy 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 201000005299 metal allergy Diseases 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 210000000214 mouth Anatomy 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000003505 polymerization initiator Substances 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C19/00—Dental auxiliary appliances
- A61C19/04—Measuring instruments specially adapted for dentistry
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C13/00—Dental prostheses; Making same
- A61C13/0003—Making bridge-work, inlays, implants or the like
- A61C13/0004—Computer-assisted sizing or machining of dental prostheses
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C13/00—Dental prostheses; Making same
- A61C13/08—Artificial teeth; Making same
- A61C13/082—Cosmetic aspects, e.g. inlays; Determination of the colour
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C19/00—Dental auxiliary appliances
- A61C19/10—Supports for artificial teeth for transport or for comparison of the colour
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C5/00—Filling or capping teeth
- A61C5/70—Tooth crowns; Making thereof
- A61C5/77—Methods or devices for making crowns
Definitions
- the present invention relates to a dental crown having a predetermined appearance color, which is a type of dental prosthesis made of a non-metallic material such as hybrid resin.
- the present invention relates to a crown appearance color confirmation method for confirming the crown appearance color, an instrument kit suitable for use in the method, and a demonstration instrument including the instrument kit.
- Dental prostheses used in dental treatment are generally formed by casting metal materials such as gold, silver, titanium, and palladium alloys, or by processing non-metal materials such as ceramics and hybrid resins.
- the core portion is made of a metallic material
- the surface layer portion such as the veneer portion is made of a non-metallic material.
- a hybrid resin hereinafter sometimes abbreviated as "HR" means a composite material in which an inorganic filler (hereinafter also referred to as an "inorganic filler”) is dispersed at high density in a resin matrix. , usually obtained by polymerizing and curing a paste-like polymerizable and curable composition containing a polymerizable monomer, an inorganic filler, and a polymerization initiator, by applying pressure, heating, or the like.
- CAD/CAM Computer Aided Design
- CAM Computer Aided Manufacturing
- CAD/CAM systems have come to be used extensively to form dental prostheses by cutting "CAD/CAM mill blocks" (sometimes called dental blanks) made of non-metallic materials. is coming.
- the CAD/CAM mill block means an object to be cut (also called a mill blank) that can be attached to a cutting machine in a CAD/CAM system.
- a (solid) block formed in the shape of a rectangular parallelepiped or a cylinder, or a (solid) disk formed in the shape of a plate or disc is generally known, and the part to be cut is a hybrid.
- One made of resin hereinafter, a CAD/CAM mill block made of HR is also simply referred to as "HR mill block" is also known.
- the colors of the A to D series are classified by brightness and indicated with symbols.
- the part to be cut is made of a non-metallic material, there is a so-called zirconia dental machining blank, but it is usually a single layer and has a plurality of shades. It is the same as the single layer HR mill block in that it is selected and used by shade taking.
- Shade taking of a CAD/CAM mill block (dental processing blank) made of a non-metallic material when a dentist treats a patient using a crown, which is a dental prosthesis having a cavity for inserting an abutment tooth.
- the choice is typically made based on the appearance color of the CAD/CAM mill block prior to machining.
- the appearance color tone of the crown when viewed alone and the appearance color tone of the crown attached to the patient's abutment tooth are different, and the crown manufactured using the selected CAD/CAM mill block is not actually used.
- the desired color harmony is often not obtained.
- An object of the present invention is to provide a method for confirmation and an instrument kit or the like that can be suitably used for the method.
- a crown appearance color confirmation method comprising:
- an image or image data obtained by imaging the appearance of the crown sample before and after inserting the abutment tooth portion of the abutment tooth sample into the open cavity portion of the crown sample may be used.
- An instrument kit comprising the instrument kit includes at least one of a plurality of abutment tooth samples and a plurality of crown samples;
- the plurality of abutment tooth samples includes a first abutment tooth sample group in which the shape of the abutment tooth portion is substantially the same and the surface coloring pattern of the abutment tooth portion is different from each other; a second abutment tooth sample group in which the surface coloration patterns of the abutment teeth are substantially the same and the shapes of the abutment teeth are different from each other;
- the plurality of crown samples includes a first crown sample group having substantially the same shape and different surface coloring patterns, and a first crown sample group having substantially the same surface coloring patterns and mutually different shapes. a second group of crown samples different from An instrument kit characterized by:
- the surface coloring patterns of the at least one abutment tooth sample and the at least one crown sample are configured using a plurality of colors including a color corresponding to one selected from 18 shades representing the color of the tooth. may have been
- the at least one crown sample may be formed by CAD/CAM using a mill block made of hybrid resin or ceramics.
- the instrument kit may further include a pick portion in which the at least one abutment tooth sample extends from the abutment tooth portion in a direction opposite to the direction of insertion into the open cavity portion.
- the instrument kit includes: including the first abutment tooth sample group and the first crown sample group;
- the shape of the abutment tooth portion of the plurality of abutment tooth samples constituting the first abutment tooth sample group, and the shape of the open cavity portion of the plurality of crown samples constituting the first crown sample group. may correspond one-to-one.
- the instrument kit includes: including the second abutment tooth sample group and the second crown sample group,
- the plurality of crown samples constituting the second crown sample group have shapes corresponding to all the shapes of the abutment tooth portions of the plurality of abutment tooth samples constituting the second abutment tooth sample group.
- a crown sample provided with said open cavity may be included.
- a fourth aspect of the present invention is A method for selecting a mill block used for forming a crown, which is a prosthetic crown provided with an open cavity, by CAD/CAM, comprising: a preparatory step of preparing the instrument kit; a selection step of selecting an abutment tooth sample having an abutment tooth portion that is similar to the patient's abutment tooth shape and surface coloring pattern from the first abutment tooth sample group; For each of the plurality of crown samples constituting the first crown sample group, the appearance color of the abutment tooth sample selected in the selection step after being inserted into the open cavity of the abutment tooth is confirmed.
- a crown sample having the appearance color confirmed in the confirmation step that best matches the appearance color of the patient's tooth is determined from the plurality of crown samples constituting the first crown sample group, and the determined crown sample is formed.
- a selection step of selecting a mill block that is substantially identical to the mill block used for A mill block selection method comprising:
- an image or image data obtained by capturing the appearance of the plurality of crown samples before and after inserting the abutment tooth portion of the abutment tooth sample into the open cavity portion of the plurality of crown samples may be used. good.
- an image or image data obtained by imaging the appearance of the crown sample before and after inserting the abutment tooth portion of the abutment tooth sample into the open cavity portion of the crown sample may be used.
- the crown appearance color confirmation method of the present invention for example, using an abutment tooth sample having an abutment tooth portion with a shade (color) determined by shade taking the color of the patient's abutment tooth, the abutment By CAD/CAM using a mill block substantially identical to the mill block used to make the crown sample, by inserting the tooth into the open cavity of the crown sample and checking its appearance color in advance. It is possible to check the shade compatibility during treatment of the crowns produced. Therefore, it is possible to select the mill block to be used for CAD/CAM by anticipating the actual finish.
- the inventors of the present invention have found that the crown is manufactured by CAD/CAM using a mill block selected by shade taking, but the reason why the desired color tone harmony cannot be obtained at the time of installation is (1). (2) Even if the material is colored, the appearance of the color is affected by the thickness of the material. I thought it was because the appearance color changed. Then, for a crown sample processed to the same shape as the actual crown, if the appearance color when attached to the abutment tooth sample of the same color as the actual patient's abutment tooth is confirmed, it is possible to use the actual crown. Based on the idea that it is possible to reliably evaluate the appearance color when restoration (treatment) is performed, a method for easily and reliably performing such confirmation was investigated. The present invention has been completed as a result of such studies.
- the intermediate HR layer M means an HR layer having an intermediate color between the enamel layer E and the dentin layer D.
- the intermediate HR layer M is usually composed of 1 to 3 layers.
- the colors of the intermediate HR layers M are preferably different from each other, and the layers are preferably laminated so as to have a gradation between them.
- crowns to be used in the present invention may be for anterior teeth, canine teeth, premolar teeth, or molar teeth. Preferably.
- the crown appearance color confirmation method of the present invention includes a preparation process and a confirmation process.
- the instrument kit 1 of the present invention or the demonstration instrument 30 of the present invention is prepared.
- the crown appearance color confirmation method of the present invention is a usage form of the tool kit 1 of the present invention or the demonstration tool 30 of the present invention.
- the demonstration instrument 30 of the present invention also includes the instrument kit 1 of the present invention.
- the instrument kit 1 comprises an abutment tooth having an abutment tooth part 21 formed in a standard shape of the abutment tooth, which has substantially the same surface coloring pattern as the patient's abutment tooth, as a constituent instrument.
- Sample 20 was formed into a standard crown shape by CAD/CAM using a mill block having substantially the same surface coloration pattern as the crown and substantially the same mill block as the mill block used to form the crown. , and a crown sample 10 provided with an open cavity portion 11 corresponding to the abutment tooth portion 21 of the abutment tooth sample 20 .
- substantially the same means a configuration obtained based on a design intended to be the same, and only differences that cannot be avoided in the manufacturing process.
- “Substantially the same” shall also include configurations that only exist.
- the crown appearance color confirmation method of the present invention includes a real confirmation method in which the appearance color of the crown sample 10 is visually confirmed in the confirmation process, and an abutment tooth sample 20 inserted into the opening cavity 11 of the crown sample 10 in the confirmation process. It can be configured as an image confirmation method using images or image data obtained by imaging the appearance of the crown sample 10 before and after the abutment tooth portion 21 is inserted. In the image confirmation method, a catalog photograph or moving image showing the appearance of the crown sample 10 can be used as the image or image data.
- the crown appearance color confirmation method of the present invention a patient's abutment in a crown formed by CAD/CAM using a mill block that is substantially the same as the mill block used to form the crown sample 10 It is possible to check in advance the appearance color after attachment to the teeth.
- the demonstration instrument 30 of the present invention will be described with reference to the drawings, taking as an example the case of preliminarily confirming the appearance color after mounting the crown of an anterior tooth manufactured using the EMD type laminated HR mill block.
- the instrument kit 1 of the present invention and the crown appearance color confirmation method of the present invention will be described.
- the demonstration instrument 30 shown in FIGS. 3 and 4 (both photographs) is a representative form of the demonstration instrument 30 of the present invention and includes an instrument kit 1, a plate 32 and a case 33. .
- the instrument kit 1 of the present invention consists of a combination of at least one crown sample 10 and at least one abutment tooth sample 20 .
- the instrument kit 1 shown in FIGS. 3 and 4 consists of a first crown sample group 31 a composed of a plurality of crown samples 10 and one abutment tooth sample 20 .
- the first crown sample group 31a is composed of five crown samples 10 having substantially the same shape and different surface coloring patterns.
- the crown sample 10 is a sample processed into a standard shape of a crown, which is a crown prosthesis for fitting an abutment tooth provided with an open cavity, and is configured as a crown sample.
- the crown sample 10 is provided with an open cavity 11 corresponding to the open cavity of the crown.
- FIG. 1 shows a front view, plan view, bottom view, right side view, and vertical cross-sectional view of a typical crown sample 10.
- the longitudinal section shows the cross section of the crown sample 10 along line XY in the front view.
- the open cavity 11 is configured as a cavity that opens only upwards and is closed laterally and downwardly.
- the crown sample 10 also has a surface 12 that faces frontally when attached to the patient's abutment tooth.
- the crown sample 10 may be provided with a holding portion such as a pedestal for holding the crown sample 10 on the plate 32 in a predetermined state.
- the surface color pattern reflects the color pattern of the mill blocks used.
- the surface coloration pattern means the pattern of the appearance color of the surface, and the coloration pattern of the surface in the case where the whole is a single color or in the case where the color is divided into a plurality of different specific colors.
- the surface coloration pattern means the arrangement of colors on the surface, specifically, when multiple colors are used, which part of the surface each color occupies, so to speak, a colored pattern. Including cases where it is composed of a single color.
- the surface coloration pattern of the crown sample 10 is preferably configured using a plurality of colors including a color corresponding to one selected from 18 shades representing tooth colors.
- FIGS. 2(a) and 2(b) right side views of two typical abutment tooth samples 20 are shown in FIGS. 2(a) and 2(b).
- the abutment tooth sample 20 is formed in the standard shape of a patient's abutment tooth and has an abutment tooth part 21 configured as a sample of an abutment tooth made of an artificial material.
- the abutment tooth part 21 corresponds to the open cavity part 11 of the crown sample 10 and has a shape and size that can be freely inserted into the opening cavity part 11, and its surface coloring pattern matches the color of the abutment tooth.
- the surface coloring pattern of the abutment tooth portion 21 is preferably configured using a plurality of colors including a color corresponding to one selected from 18 shades representing the color of the tooth.
- the abutment tooth sample 20 preferably has a pick portion 22 .
- the knob portion 22 extends from the abutment tooth portion 21 in the direction opposite to the insertion direction of the crown sample 10 into the open cavity portion 11 .
- the grip portion 22 enhances convenience when manipulating the abutment tooth sample 20.
- the abutment tooth sample 20 can be freely manipulated manually.
- the shape of the knob portion 22 is not particularly limited as long as it can achieve such a purpose.
- the knob portion 22 is integrally formed with the abutment tooth portion 21 and is provided in the shape of a projecting piece protruding from the abutment tooth portion 21 .
- the number of crown samples 10 constituting the first crown sample group 31a of the same shape and different color is 2 to 18 (the upper limit of 18 is 16 for the number of vita shades, and a shade simulating whitening called bleach shade 2 is added to the number).
- the same system color or two system colors are often compared, and in such a case, the number of crown samples 10 constituting the first crown sample group 31a is preferably 2 to 9. , is particularly preferred.
- FIG. 5 is a diagram illustrating the first abutment tooth sample group 31b.
- the shades of the five abutment tooth samples 20 are A1, A2, A3, A3.5 and A4 from the left side.
- Each of the five abutment tooth samples 20 constituting the first abutment tooth sample group 31b shown in FIG. 5 has the configuration shown in FIG. 2(b).
- five abutment tooth samples 20 are bundled together by a string passed through a ring-shaped hook portion provided in each knob portion 22. held.
- the plate 32 included in the demonstration device 30 functions as a mount for holding the crown samples 10 side by side, and its material is not particularly limited. Synthetic resins such as polycarbonate and metals such as stainless steel plates can be used, but those made of synthetic resins such as polypropylene are preferable because they are easy to process and light and do not corrode. Moreover, it is not always necessary to be a highly rigid plate-like body, and a flexible sheet-like body may be used. When it is in such a sheet form, it is preferable to use it by laying it in a hard case 33 or the like.
- the size of the plate 32 is appropriately determined according to the number and layout of the crown samples 10 to be held, but is usually 2 to 10 cm long, 2 to 15 cm wide, and 0.1 to 5 mm thick, preferably It is 2.5-6 cm long, 2.5-8 cm wide, and 0.3-2 mm thick. Also, on the display surface of the plate 32, information about the retained crown sample 10 (for example, information for specifying the mill block used to manufacture it by CAD/CAM, specifically the product name, grade , model number, etc.) is preferably provided.
- the demonstration instrument 30 is produced by CAD/CAM using a mill block as a commercial product to produce a crown sample 10, so that when the crown produced using the commercial product is actually installed, It is useful as an advertising or promotional tool for the product because it can demonstrate color matching.
- the plate 32 holding the crown sample 10 and the abutment tooth sample 20 are preferably housed in a dedicated case 33 as shown in FIG.
- a case 33 has a structure in which a case body 34 and a lid portion 35 are connected by a hinge so as to be freely openable and closable.
- a holding mechanism 37 for holding the abutment tooth sample 20 is provided inside the lid portion 35 , and the plate 32 holding the crown sample 10 is accommodated in the case main body 34 .
- the cap 35 is opened (without removing the plate 32), and the abutment tooth 21 of the abutment tooth sample 20 is grasped by the gripping portion 22. It is adapted to be inserted into the open cavity 11 of the sample 10 .
- the crown sample 10 of the second "A2-LY" from the left (representing that it was produced using an EMD type laminated HR mill block whose shade of D is A2)
- the appearance color of the abutment tooth sample 20 after insertion of the abutment tooth portion 21 is slightly reddish compared to before the insertion.
- the instrument kit 1 using the first crown sample group 31a consisting of five crown samples 10 and one abutment tooth sample 20 has been described above, the instrument kit 1 of the present invention is limited to this. isn't it.
- the instrument kit 1 of the present invention is limited to this. isn't it.
- the instrument kit 1 of the present invention is limited to this. isn't it.
- the instrument kit 1 of the present invention is limited to this. isn't it.
- the instrument kit 1 using the first crown sample group 31a consisting of five crown samples 10 and one abutment tooth sample 20 is limited to this. isn't it.
- the abutment tooth samples 20 constituting the first abutment tooth sample group 31b are not limited to the configuration shown in FIG. 2(b), and may have the configuration shown in FIG. 2(a).
- the instrument kit 1 constituting the demonstration instrument 30 shown in FIG. 6 uses the abutment tooth sample 20 configured as shown in FIG. 18 crown samples 10 with different surface coloring patterns are stored as a first abutment tooth sample group 31b, and 18 abutment tooth samples 20 corresponding to the color tone of each crown sample 10 are stored as a first abutment tooth sample group 31b. be.
- the operator can select the most appropriate color tone for the patient by displaying many color tones as the crown sample 10 in the case body 34 at once. It becomes possible.
- the instrument kit 1 including the first crown sample group 31a and the first abutment tooth sample group 31b as shown in FIG. and the shapes of the abutment tooth portions 21 of the plurality of abutment tooth samples 20 constituting the first abutment tooth sample group 31b are preferably in one-to-one correspondence.
- the number of crown samples 10 constituting the second crown sample group and the number of abutment tooth samples 20 constituting the second abutment tooth sample group are set to be the same.
- the shape and size of the abutment tooth portion 21 of the plurality of abutment tooth samples 20 constituting the second abutment tooth sample group, and the shape and size of the open cavity portion 11 of the plurality of crown samples 10 constituting the second crown sample group It is also possible to adopt a mode in which , and correspond to each other on a one-to-one basis.
- all of the abutment tooth portions 21 of the plurality of abutment tooth samples 20 that make up the second abutment tooth sample group are attached to the plurality of crown samples 10 that make up the second crown sample group.
- the mill block selection method of the present invention includes a preparation process, a selection process, a confirmation process, and a selection process.
- an instrument kit 1 or a demonstration instrument 30 including a first crown sample group 31a and a first abutment tooth sample group 31b is prepared.
- an abutment tooth sample 20 having an abutment tooth portion 21 that approximates the shape and surface coloration pattern of the patient's abutment tooth is selected from the first abutment tooth sample group 31b.
- the patient's abutment tooth has a surface coloring pattern confirmed but the shape is undetermined, at a stage where the abutment tooth is
- a mill block to be used for forming a crown which is a dental prosthesis having an open cavity to be inserted, by CAD/CAM, the appearance color of the crown formed using the candidate mill block
- the confirmation method of the present invention includes a preparation step and a confirmation step.
- the surface coloring pattern of the abutment tooth portion 21 of the abutment tooth portion 21 of the plurality of abutment tooth samples 20 constituting the second abutment tooth sample group including the second crown sample group and the second abutment tooth sample group is supported.
- a plurality of crown samples 10 that are substantially the same as or similar to the surface coloring pattern of the pedestal and that constitute the second group of crown samples are formed using mill blocks that are substantially the same as the candidate mill blocks.
- An instrument kit 1 or a demonstration instrument 30 is prepared.
- the confirmation step a combination of the crown sample 10 and the abutment tooth sample 20 having the opening cavity 11 and the abutment tooth portion 21 of mutually corresponding shapes selected from the second crown sample group and the second abutment tooth sample group For each of the above, the appearance color of the abutment tooth sample 20 after being inserted into the opening cavity 11 of the abutment tooth portion 21 is confirmed.
- an image or image data obtained by capturing the external appearance of the plurality of crown samples 10 before and after inserting the abutment tooth portion 21 of the abutment tooth sample 20 into the open cavity portion 11 of the plurality of crown samples 10 is used. be able to.
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Epidemiology (AREA)
- Dentistry (AREA)
- Animal Behavior & Ethology (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Biophysics (AREA)
- Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
Abstract
Description
開口空洞部が設けられた歯冠補綴物であり、ミルブロックを用いたCAD/CAMによって形成されたクラウンにおける患者の支台歯を前記開口空洞部内に挿入した後の外観色を事前に確認するクラウン外観色確認方法であって、
表面配色パターンが前記支台歯と実質的に同一であり、前記支台歯の標準的な形状に形成された支台歯部を有する支台歯サンプルと、表面配色パターンが前記クラウンと実質的に同一であり、前記クラウンを形成するために用いるミルブロックと実質的に同一のミルブロックを用いたCAD/CAMによって前記クラウンの標準的な形状に形成され、前記支台歯サンプルの前記支台歯部に対応する開口空洞部が設けられたクラウンサンプルと、の組み合わせからなる器具キットを準備する準備工程と、
前記クラウンサンプルの前記開口空洞部内への前記支台歯サンプルの前記支台歯部の挿入前後における前記クラウンサンプルの外観色を確認する確認工程と、
を含むことを特徴とするクラウン外観色確認方法である。
患者の支台歯の見本として構成され、前記支台歯の標準的な形状に形成された支台歯部を有する少なくとも1つの支台歯サンプルと、
開口空洞部が設けられた歯冠補綴物であり、前記支台歯が前記開口空洞部内に挿入されるクラウンの見本として構成され、前記クラウンの標準的な形状に形成され、前記支台歯サンプルの前記支台歯部に対応する開口空洞部が設けられた少なくとも1つのクラウンサンプルと、
を含む器具キットであって、
前記器具キットは、複数の支台歯サンプルと、複数のクラウンサンプルと、の少なくとも一方を含み、
前記複数の支台歯サンプルは、前記支台歯部の形状が相互に実質的に同一であり、かつ前記支台歯部の表面配色パターンが相互に異なる第1支台歯サンプル群と、前記支台歯部の表面配色パターンが相互に実質的に同一であり、かつ前記支台歯部の形状が相互に異なる第2支台歯サンプル群と、の少なくとも一方を構成し、
前記複数のクラウンサンプルは、形状が相互に実質的に同一であり、かつ表面配色パターンが相互に異なる第1クラウンサンプル群と、表面配色パターンが相互に実質的に同一であり、かつ形状が相互に異なる第2クラウンサンプル群と、の少なくとも一方を構成する、
ことを特徴とする器具キットである。
前記第1支台歯サンプル群と、前記第1クラウンサンプル群と、を含み、
前記第1支台歯サンプル群を構成する前記複数の支台歯サンプルの前記支台歯部の形状と、前記第1クラウンサンプル群を構成する前記複数のクラウンサンプルの前記開口空洞部の形状と、が一対一に対応していてもよい。
前記第2支台歯サンプル群と、第2クラウンサンプル群と、を含み、
前記第2クラウンサンプル群を構成する前記複数のクラウンサンプルには、前記第2支台歯サンプル群を構成する前記複数の支台歯サンプルの前記支台歯部のすべての形状に対応する形状の前記開口空洞部が設けられたクラウンサンプルが含まれてもよい。
前記クラウン外観色確認方法を実演するために用いるデモンストレーション用器具であって、
前記器具キットを含み、
前記複数のクラウンサンプルの数が2~18個であり、
前記複数のクラウンサンプルは、前記開口空洞部への前記支台歯サンプルの前記支台歯部の挿入を受けることが可能な状態で配列されている
ことを特徴とするデモンストレーション用器具である。
開口空洞部が設けられた歯冠補綴物であるクラウンをCAD/CAMによって形成するために用いるミルブロックの選定方法であって、
上記器具キットを準備する準備工程と、
前記第1支台歯サンプル群から患者の支台歯の形状及び表面配色パターンと近似する支台歯部を有する支台歯サンプルを選択する選択工程と、
前記第1クラウンサンプル群を構成する前記複数のクラウンサンプルのそれぞれについて前記選択工程で選択された前記支台歯サンプルの前記支台歯部の前記開口空洞部への挿入後の外観色を確認する確認工程と、
前記第1クラウンサンプル群を構成する前記複数のクラウンサンプルから前記確認工程で確認された外観色が患者の歯牙の外観色と最も適合するクラウンサンプルを決定し、決定された前記クラウンサンプルを形成するために用いたミルブロックと実質的に同一のミルブロックを選定する選定工程と、
を含むことを特徴とするミルブロックの選定方法である。
患者の支台歯について表面配色パターンは確認されているが形状が未確定である段階において、前記支台歯が挿入される開口空洞部が設けられた歯冠補綴物であるクラウンをCAD/CAMによって形成するために用いるミルブロックを選定する際に、候補となるミルブロックを用いて形成したクラウンの外観色に及ぼす前記支台歯の形状の影響の確認方法であって、
前記第2支台歯サンプル群を構成する前記複数の支台歯サンプルの前記支台歯部の表面配色パターンが前記支台歯の表面配色パターンと実質的に同一であるか近似しており、前記第2クラウンサンプル群を構成する前記複数のクラウンサンプルが前記候補となるミルブロックと実質的に同一のミルブロックを用いて形成されている器具キットを準備する準備工程と、
前記第2クラウンサンプル群及び前記第2支台歯サンプル群から選択される相互に対応する形状の前記開口空洞部及び前記支台歯部を有するクラウンサンプル及び支台歯サンプルの組み合わせのそれぞれについて前記支台歯サンプルの前記支台歯部の前記開口空洞部への挿入後の外観色を確認する確認工程と、
を含むことを特徴とする確認方法である。
10・・・クラウンサンプル
11・・・開口空洞部
12・・・表面
20・・・支台歯サンプル
21・・・支台歯部
22・・・摘み部
30・・・デモンストレーション用器具
31a・・・第1クラウンサンプル群
31b・・・第1支台歯サンプル群
32・・・プレート
33・・・ケース
34・・・ケース本体
35・・・蓋部
36・・・キャプション表示部
37・・・保持機構
Claims (14)
- 開口空洞部が設けられた歯冠補綴物であり、ミルブロックを用いたCAD/CAMによって形成されたクラウンにおける患者の支台歯を前記開口空洞部内に挿入した後の外観色を事前に確認するクラウン外観色確認方法であって、
表面配色パターンが前記支台歯と実質的に同一であり、前記支台歯の標準的な形状に形成された支台歯部を有する支台歯サンプルと、表面配色パターンが前記クラウンと実質的に同一であり、前記クラウンを形成するために用いるミルブロックと実質的に同一のミルブロックを用いたCAD/CAMによって前記クラウンの標準的な形状に形成され、前記支台歯サンプルの前記支台歯部に対応する開口空洞部が設けられたクラウンサンプルと、の組み合わせからなる器具キットを準備する準備工程と、
前記クラウンサンプルの前記開口空洞部内への前記支台歯サンプルの前記支台歯部の挿入前後における前記クラウンサンプルの外観色を確認する確認工程と、
を含むことを特徴とするクラウン外観色確認方法。 - 前記確認工程では、前記クラウンサンプルの前記開口空洞部内への前記支台歯サンプルの前記支台歯部の挿入前後における前記クラウンサンプルの外観を撮像した画像又は画像データを用いる、
請求項1に記載のクラウン外観色確認方法。 - 患者の支台歯の見本として構成され、前記支台歯の標準的な形状に形成された支台歯部を有する少なくとも1つの支台歯サンプルと、
開口空洞部が設けられた歯冠補綴物であり、前記支台歯が前記開口空洞部内に挿入されるクラウンの見本として構成され、前記クラウンの標準的な形状に形成され、前記支台歯サンプルの前記支台歯部に対応する開口空洞部が設けられた少なくとも1つのクラウンサンプルと、
を含む器具キットであって、
前記器具キットは、複数の支台歯サンプルと、複数のクラウンサンプルと、の少なくとも一方を含み、
前記複数の支台歯サンプルは、前記支台歯部の形状が相互に実質的に同一であり、かつ前記支台歯部の表面配色パターンが相互に異なる第1支台歯サンプル群と、前記支台歯部の表面配色パターンが相互に実質的に同一であり、かつ前記支台歯部の形状が相互に異なる第2支台歯サンプル群と、の少なくとも一方を構成し、
前記複数のクラウンサンプルは、形状が相互に実質的に同一であり、かつ表面配色パターンが相互に異なる第1クラウンサンプル群と、表面配色パターンが相互に実質的に同一であり、かつ形状が相互に異なる第2クラウンサンプル群と、の少なくとも一方を構成する、
ことを特徴とする器具キット。 - 前記少なくとも1つの支台歯サンプル及び前記少なくとも1つのクラウンサンプルの表面配色パターンは、歯牙の色を表す18種のシェードの中から選ばれる1種に対応する色を含む複数の色を用いて構成されている、
請求項3に記載の器具キット。 - 前記少なくとも1つのクラウンサンプルが、ハイブリッドレジン又はセラミックスで形成されたミルブロックを用いたCAD/CAMによって形成される、
請求項3に記載の器具キット。 - 前記少なくとも1つの支台歯サンプルが、前記支台歯部から前記開口空洞部への挿入方向とは反対側に延びる摘み部を更に有する、
請求項3に記載の器具キット。 - 前記クラウンサンプルを形成するために用いるミルブロックと実質的に同一のミルブロックを用いたCAD/CAMによって形成されるクラウンにおける患者の支台歯への装着後の外観色を事前に確認するために用いられる、
請求項5に記載の器具キット。 - 前記第1支台歯サンプル群と、前記第1クラウンサンプル群と、を含み、
前記第1支台歯サンプル群を構成する前記複数の支台歯サンプルの前記支台歯部の形状と、前記第1クラウンサンプル群を構成する前記複数のクラウンサンプルの前記開口空洞部の形状と、が一対一に対応している、
請求項3に記載の器具キット。 - 前記第2支台歯サンプル群と、第2クラウンサンプル群と、を含み、
前記第2クラウンサンプル群を構成する前記複数のクラウンサンプルには、前記第2支台歯サンプル群を構成する前記複数の支台歯サンプルの前記支台歯部のすべての形状に対応する形状の前記開口空洞部が設けられたクラウンサンプルが含まれる
請求項3に記載の器具キット。 - 請求項1に記載のクラウン外観色確認方法を実演するために用いるデモンストレーション用器具であって、
請求項3に記載の器具キットを含み、
前記複数のクラウンサンプルの数が2~18個であり、
前記複数のクラウンサンプルは、前記開口空洞部への前記支台歯サンプルの前記支台歯部の挿入を受けることが可能な状態で配列されている
ことを特徴とするデモンストレーション用器具。 - 開口空洞部が設けられた歯冠補綴物であるクラウンをCAD/CAMによって形成するために用いるミルブロックの選定方法であって、
請求項8に記載の器具キットを準備する準備工程と、
前記第1支台歯サンプル群から患者の支台歯の形状及び表面配色パターンと近似する支台歯部を有する支台歯サンプルを選択する選択工程と、
前記第1クラウンサンプル群を構成する前記複数のクラウンサンプルのそれぞれについて前記選択工程で選択された前記支台歯サンプルの前記支台歯部の前記開口空洞部への挿入後の外観色を確認する確認工程と、
前記第1クラウンサンプル群を構成する前記複数のクラウンサンプルから前記確認工程で確認された外観色が患者の歯牙の外観色と最も適合するクラウンサンプルを決定し、決定された前記クラウンサンプルを形成するために用いたミルブロックと実質的に同一のミルブロックを選定する選定工程と、
を含むことを特徴とするミルブロックの選定方法。 - 前記確認工程では、前記複数のクラウンサンプルの前記開口空洞部内への前記支台歯サンプルの前記支台歯部の挿入前後における前記複数のクラウンサンプルの外観を撮像した画像又は画像データを用いる
請求項11に記載のミルブロックの選定方法。 - 患者の支台歯について表面配色パターンは確認されているが形状が未確定である段階において、前記支台歯が挿入される開口空洞部が設けられた歯冠補綴物であるクラウンをCAD/CAMによって形成するために用いるミルブロックを選定する際に、候補となるミルブロックを用いて形成したクラウンの外観色に及ぼす前記支台歯の形状の影響の確認方法であって、
請求項9に記載の器具キットであって、前記第2支台歯サンプル群を構成する前記複数の支台歯サンプルの前記支台歯部の表面配色パターンが前記支台歯の表面配色パターンと実質的に同一であるか近似しており、前記第2クラウンサンプル群を構成する前記複数のクラウンサンプルが前記候補となるミルブロックと実質的に同一のミルブロックを用いて形成されている器具キットを準備する準備工程と、
前記第2クラウンサンプル群及び前記第2支台歯サンプル群から選択される相互に対応する形状の前記開口空洞部及び前記支台歯部を有するクラウンサンプル及び支台歯サンプルの組み合わせのそれぞれについて前記支台歯サンプルの前記支台歯部の前記開口空洞部への挿入後の外観色を確認する確認工程と、
を含むことを特徴とする確認方法。 - 前記確認工程では、前記クラウンサンプルの前記開口空洞部内への前記支台歯サンプルの前記支台歯部の挿入前後における前記クラウンサンプルの外観を撮像した画像又は画像データを用いる
請求項13に記載の確認方法。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2023545460A JP7393077B2 (ja) | 2021-09-06 | 2022-08-22 | クラウン外観色確認方法、デモンストレーション用器具、ミルブロックの選定方法及び確認方法 |
CN202280053597.9A CN117794487A (zh) | 2021-09-06 | 2022-08-22 | 牙冠外观颜色确认方法、器具套件以及演示用器具 |
EP22864312.8A EP4400075A1 (en) | 2021-09-06 | 2022-08-22 | Crown appearance color confirmation method, appliance kit, and appliance for demonstration |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2021-144884 | 2021-09-06 | ||
JP2021144884 | 2021-09-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2023032728A1 true WO2023032728A1 (ja) | 2023-03-09 |
Family
ID=85412529
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2022/031526 WO2023032728A1 (ja) | 2021-09-06 | 2022-08-22 | クラウン外観色確認方法、器具キット及びデモンストレーション用器具 |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP4400075A1 (ja) |
JP (1) | JP7393077B2 (ja) |
CN (1) | CN117794487A (ja) |
WO (1) | WO2023032728A1 (ja) |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0531127A (ja) * | 1991-07-26 | 1993-02-09 | Olympus Optical Co Ltd | 歯冠修復物の色調調整方法及びそれに使用する歯冠修復物用作業模型並びに接着剤 |
JP2009160086A (ja) * | 2007-12-28 | 2009-07-23 | Olympus Corp | 歯科用測色治具、歯科用測色治具システムおよび歯科測色システム |
WO2009154301A1 (ja) | 2008-06-18 | 2009-12-23 | 株式会社アドバンス | 歯科補綴物加工用ブロック及びその製造方法 |
US20100221682A1 (en) * | 2007-10-15 | 2010-09-02 | Burger Bernd K | Restoration, restoration components, and methods of making a dental restoration |
JP6004769B2 (ja) | 2012-06-15 | 2016-10-12 | クラレノリタケデンタル株式会社 | 歯の色を判定する方法および該方法を実施するためのシェードガイド |
JP2017113224A (ja) | 2015-12-24 | 2017-06-29 | クラレノリタケデンタル株式会社 | 歯科用ミルブランクの製造方法 |
JP2017213394A (ja) | 2017-07-28 | 2017-12-07 | 株式会社トクヤマデンタル | 歯科cad/cam用レジンブロック |
JP2018095620A (ja) * | 2016-12-15 | 2018-06-21 | 株式会社トクヤマデンタル | 歯科用樹脂複合材料 |
JP2019211704A (ja) * | 2018-06-07 | 2019-12-12 | 株式会社トクヤマデンタル | デモンストレーション用器具 |
-
2022
- 2022-08-22 EP EP22864312.8A patent/EP4400075A1/en active Pending
- 2022-08-22 WO PCT/JP2022/031526 patent/WO2023032728A1/ja active Application Filing
- 2022-08-22 CN CN202280053597.9A patent/CN117794487A/zh active Pending
- 2022-08-22 JP JP2023545460A patent/JP7393077B2/ja active Active
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0531127A (ja) * | 1991-07-26 | 1993-02-09 | Olympus Optical Co Ltd | 歯冠修復物の色調調整方法及びそれに使用する歯冠修復物用作業模型並びに接着剤 |
US20100221682A1 (en) * | 2007-10-15 | 2010-09-02 | Burger Bernd K | Restoration, restoration components, and methods of making a dental restoration |
JP2009160086A (ja) * | 2007-12-28 | 2009-07-23 | Olympus Corp | 歯科用測色治具、歯科用測色治具システムおよび歯科測色システム |
WO2009154301A1 (ja) | 2008-06-18 | 2009-12-23 | 株式会社アドバンス | 歯科補綴物加工用ブロック及びその製造方法 |
JP6004769B2 (ja) | 2012-06-15 | 2016-10-12 | クラレノリタケデンタル株式会社 | 歯の色を判定する方法および該方法を実施するためのシェードガイド |
JP2017113224A (ja) | 2015-12-24 | 2017-06-29 | クラレノリタケデンタル株式会社 | 歯科用ミルブランクの製造方法 |
JP2018095620A (ja) * | 2016-12-15 | 2018-06-21 | 株式会社トクヤマデンタル | 歯科用樹脂複合材料 |
JP2017213394A (ja) | 2017-07-28 | 2017-12-07 | 株式会社トクヤマデンタル | 歯科cad/cam用レジンブロック |
JP2019211704A (ja) * | 2018-06-07 | 2019-12-12 | 株式会社トクヤマデンタル | デモンストレーション用器具 |
Also Published As
Publication number | Publication date |
---|---|
JP7393077B2 (ja) | 2023-12-06 |
EP4400075A1 (en) | 2024-07-17 |
JPWO2023032728A1 (ja) | 2023-03-09 |
CN117794487A (zh) | 2024-03-29 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CA2725818C (en) | Methods for designing a customized dental prosthesis using digital images of a patient | |
KR101597268B1 (ko) | 제어된 색조를 갖춘 비니어 치아 수복물 | |
US7530812B2 (en) | Three-dimensional dental training system | |
WO2002009612A1 (en) | Millable blocks for making dental prostheses, associated dental prostheses and methods of making | |
JPH04505113A (ja) | 義歯および人工歯冠の製造 | |
US5800164A (en) | System to select the form and color structure of teeth | |
US20060084027A1 (en) | Method and apparatus for communicating tooth characteristics and tooth restoration produced thereby | |
KR20180039146A (ko) | 치과용 미용품 수복물 모형 및 치과용 오버레이 장치 | |
Salat et al. | Achieving a Precise Color Chart with Common Computer Software for Excellence in Anterior Composite Restorations. | |
US20080081318A1 (en) | Prelayered dental appliances, kits, and methods for providing consistent shade matching | |
CN112368759B (zh) | 演示用器具 | |
WO2023032728A1 (ja) | クラウン外観色確認方法、器具キット及びデモンストレーション用器具 | |
JP2017511163A (ja) | 歯肉インデックス器具および歯肉をインデックスする方法 | |
JP2009022433A (ja) | 歯科充填材料用載置体 | |
Ceinos et al. | Determining color for the direct restorative approach. | |
Felippe et al. | Clinical strategies for success in proximoincisal composite restorations. Part I: Understanding color and composite selection | |
JP2022009430A (ja) | デモンストレーション用器具 | |
JP7390094B2 (ja) | 歯科用セメントキット | |
US20030180687A1 (en) | Multicolor tooth used as a layering model in preparing veneers | |
EL-Etreby | Intraoral characterization of monolithic ceramics: The “Triple R” protocol | |
Manauta et al. | IN & OUT: A new concept in composite stratification | |
EL-Etreby | Future Dental Journal | |
Kahng et al. | The Benefit of Low-Fusing Porcelain Laminate Veneers. |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 22864312 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2023545460 Country of ref document: JP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 202280053597.9 Country of ref document: CN |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2022864312 Country of ref document: EP Ref document number: 2024105520 Country of ref document: RU |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
ENP | Entry into the national phase |
Ref document number: 2022864312 Country of ref document: EP Effective date: 20240408 |