Dentistry cutting practice model

Abstract

A dentistry cutting practice model (1), comprising: an enamel part (2), which is in the shape of a box that is open downward and has a pattern (10) on the outer surface; a dentin part (3), which is softer than the enamel part (2), is in the shape of a box that is open downward, and covers the inner surface of the enamel part (2); and a dental pulp part (4), which covers the inner surface of the dentin part (3). The pattern (10) comprises: a first pattern (11), which is disposed on the outer surface of an upper wall portion (8) of the enamel part (2); and a second pattern (12), which continuously extends from the outer surface of the upper wall portion (8) of the enamel part (4) to the outer surface of a side wall portion (9) of the enamel part (4). The model can easily carry out practice in the case of simulating the cutting of the occlusal surface of a tooth and in the case of simulating the continuous cutting from the occlusal surface to the side surface of a tooth.

Description

Dental cutting practice model Technical Field

[0001] The present invention relates to a dental cutting practice model used for tooth cutting practice. Background Art

[0002] Dentists or dental school students sometimes use natural extracted teeth as cutting practice materials in order to experience the intraoral work involved in dental treatment. Using such natural extracted teeth is suitable for dental trainees in order to memorize the actual cutting sensation of teeth, as well as the structure of teeth and the shape of root canals. On the other hand, natural extracted teeth require careful preservation due to decay and hygiene issues, particularly infection. Therefore, in order to experience intraoral work and practice the cutting sensation, a dental training device with a multilayer structure that mimics natural teeth has been proposed as a cutting practice material to replace natural extracted teeth (for example, see Patent Document 1).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2010-49038

[0006] Summary of the Invention

[0007] Problems to be solved by the invention

[0008] Such a dental practice device includes a plate-shaped plate that simulates the hardness of tooth enamel and a plate-shaped plate that simulates the hardness of dentin. This allows for the difference in cutting sensation between the enamel and dentin portions to be demonstrated. However, with existing dental practice devices, since the plate-shaped plate that simulates the hardness of tooth enamel and the plate-shaped plate that simulates the hardness of dentin are stacked together, it is not possible to perform practice that involves continuous cutting from the top surface to the side surfaces, leaving room for improvement. Specifically, with the existing configuration, it is impossible to perform practice that envisions continuous cutting from the tooth's meshing surface to the side surfaces.

[0009] The present invention has been made in view of such problems, and its object is to provide a dental cutting practice model that can easily perform two types of practice: practice assuming cutting the tooth's meshing surface and practice assuming continuous cutting from the tooth's meshing surface to the side surface.

[0010] Solutions for solving problems

[0011] (1) The dental cutting practice model of the present invention comprises: an enamel portion, which is box-shaped and opens downward and has a pattern on its outer surface; and a dentin portion, which is softer than the enamel portion and covers the inner surface of the enamel portion, wherein the pattern includes: a first pattern, which is provided on the outer surface of the upper wall portion of the enamel portion; and a second pattern, which is continuous from the outer surface of the upper wall portion of the enamel portion to the outer surface of the side wall portion of the enamel portion.

[0012] (2) Preferably, in the above (1), the first pattern includes a pattern imitating an engaging surface of a tooth, and the second pattern includes a pattern imitating an outline of a shape to be cut.

[0013] (3) Preferably, in the above (1) or (2), the dentin part is box-shaped and opens downward, and further includes a pulp part covering the inner surface of the dentin part.

[0014] (4) Preferably, in any one of the above (1) to (3), the dental cutting practice model can be mounted on and removed from the articulator, and the articulator has an upper jaw support portion located on the upper side, a lower jaw support portion located on the lower side, and a connecting portion connecting the upper jaw support portion and the lower jaw support portion, and has a loading and unloading portion that can be mounted on and removed from the upper jaw support portion and the lower jaw support portion.

[0015] (5) Preferably, in any one of the above (1) to (4), the device has a top view outer shape that imitates the top view contour of the jaw.

[0016] (6) Preferably, in any one of the above (1) to (5), a model tooth imitating the shape of a tooth is provided, and the model tooth is attached to the enamel portion in an attaching and detachable manner by an attaching member.

[0017] Effects of the Invention

[0018] According to the present invention, a dental cutting practice model can be provided that allows easy practice assuming cutting of the tooth meshing surface, practice assuming continuous cutting from the tooth meshing surface to the side surface, and operation of a cutting tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG1 is a perspective view showing a dental cutting practice model according to a first embodiment of the present invention, and shows a state viewed from above.

[0020] FIG. 2 is a perspective view showing the dental cutting practice model according to the first embodiment of the present invention, and shows a state viewed from below.

[0021] FIG3 is a side longitudinal sectional view showing the dental cutting practice model according to the first embodiment of the present invention.

[0022] FIG4 is a side view showing a state in which the dental cutting practice model according to the first embodiment of the present invention is attached to the articulator.

[0023] FIG5 is a side longitudinal sectional view showing a state where the dental cutting practice model according to the first embodiment of the present invention is attached to the articulator.

[0024] FIG6 is a bottom view showing an attachment portion used when attaching the dental cutting practice model according to the first embodiment of the present invention to the articulator.

[0025] FIG7 is a side longitudinal sectional view showing a mounting portion used when mounting the dental cutting practice model according to the first embodiment of the present invention to the articulator.

[0026] FIG8 is a longitudinal sectional view showing a dental cutting practice model according to a second embodiment of the present invention. DETAILED DESCRIPTION

[0027] Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0028] FIG1 is a perspective view of a dental cutting practice model according to Embodiment 1 of the present invention, viewed from above. FIG2 is a perspective view of a dental cutting practice model according to Embodiment 1 of the present invention, viewed from below. FIG3 is a side longitudinal cross-sectional view of the dental cutting practice model according to Embodiment 1 of the present invention. The dental cutting practice model 1 according to Embodiment 1 includes a pulp portion 2, a dentin portion 3, and an enamel portion 4.

[0029] The marrow portion 2 is in the shape of a roughly rectangular plate or a roughly rectangular box opening downward when viewed from above, with the left-right direction as the long side direction and the front-back direction as the short side direction. In this embodiment 1, the four corners of the marrow portion 2 are formed into arc shapes. Specifically, the radius of the left and right corners on the front side is larger than the radius of the left and right corners on the back side. Due to such a structure, the marrow portion 2 has a top-view outer shape that imitates the top-view contour of the jaw. A plurality of recesses 5 opening downward are formed on the lower plate surface of the marrow portion 2. Thereby, the lightweight model 1 for dental cutting practice can be achieved. In this embodiment 1, the main component constituting the marrow portion 2 is not particularly limited, and is, for example, melamine resin.

[0030] The dentin part 3 is a box-shaped, roughly rectangular shape that opens downward and is softer than the enamel part 4 described later. The dentin part 3 has a plate-shaped plate covering portion 6 that covers the upper plate surface of the medullary part 2 and a plate-shaped side covering portion 7 that covers the side surface of the medullary part 2. In other words, the inner surface of the dentin part 3 is covered by the medullary part 2. The plate covering portion 6 is a plate-shaped, roughly rectangular shape when viewed from above, with the left-right direction as the long side direction and the front-back direction as the short side direction. The four corners of the plate covering portion 6 are formed in an arc shape. Specifically, the radius of the left and right corners on the front side is larger than the radius of the left and right corners on the back side. Due to this structure, the plate covering portion 6 has a top-view outer shape that imitates the top-view contour of the jaw in a manner that can cover the upper plate surface of the medullary part 2. The side covering portion 7 surrounds the medullary part 2 in a manner that covers the side surfaces of the medullary part 2. The side covering portion 7 is continuous with the plate covering portion 6. That is, the side covering portion 7 extends downward from the outer edge of the plate covering portion 6. Thus, the dentin portion 3 is plate-shaped with its outer edge curved downward. In this first embodiment, the main component constituting the dentin portion 3 is not particularly limited and may be, for example, melamine resin. In addition to the main component described above, the dentin portion 3 also contains a component that adjusts the hardness of the dentin portion 3.

[0031] The enamel portion 4 is a box-shaped, generally rectangular shape that opens downward. Specifically, the enamel portion 4 has a plate-shaped upper wall portion 8 that covers the plate-coating portion 6 of the dentin portion 3, and a plate-shaped side wall portion 9 that covers the side-coating portion 7 of the dentin portion 3. In other words, the inner surface of the enamel portion 4 is covered by the dentin portion 3. The upper wall portion 8 is a plate-shaped, generally rectangular shape when viewed from above, with the left-right direction as the long side and the front-back direction as the short side. The four corners of the upper wall portion 8 are formed into circular arcs. Specifically, the radius of the left and right corners on the front side is larger than the radius of the left and right corners on the back side. Due to this structure, the upper wall portion 8 has a plan view shape that mimics the top view contour of the jaw so that it can cover the upper plate surface of the plate-coating portion 6. The side wall portion 9 surrounds the side-coating portion 7 so that it covers the outer surface of the side-coating portion 7. The side wall portion 9 is continuous with the upper wall portion 8. That is, the side wall portion 9 extends downward from the outer edge of the upper wall portion 8. In this way, the enamel portion 4 is in the shape of a plate with an outer edge bent downward. In the present embodiment 1, the main component constituting the enamel portion 4 is not particularly limited, and is, for example, a melamine resin. In addition to the main component, the enamel portion 4 also has a component for adjusting the hardness of the enamel portion 4. The enamel portion 4 is harder than the dentin portion 3. By appropriately adjusting the component for adjusting the hardness of the dentin portion 3 and the component for adjusting the hardness of the enamel portion 4, the enamel portion 4 can be made harder than the dentin portion 3.

[0032] A plurality of patterns 10 are provided on the outer surface of the enamel portion 4. The pattern 10 includes a first pattern 11 provided on the upper wall portion 8 and a second pattern 12 extending from the upper wall portion 8 to the side wall portion 9. The first pattern 11 is provided only on the outer surface of the upper wall portion 8. In the first embodiment, the first pattern 11 includes a pattern imitating the meshing surface of a tooth and a geometric pattern. The pattern imitating the meshing surface of a tooth shows the state of a tooth located on the mandibular side as viewed from above. In addition, the pattern imitating the meshing surface of a tooth may also be the state of a tooth located on the maxillary side as viewed from below, and may also include two states: the state of a tooth located on the mandibular side as viewed from above and the state of a tooth located on the maxillary side as viewed from below. In addition, the first pattern 11 includes a linear pattern, a circular pattern, an elliptical pattern, and a pattern combining a linear pattern and a circular pattern. The second pattern 12 is provided in a manner continuous on the outer surface of the upper wall portion 8 and the outer surface of the side wall portion 9. In the first embodiment, the second pattern 12 includes a pattern imitating the contour of the shape to be cut. Typically, the second pattern 12 includes a rectangular pattern and a pattern that simulates a Class II cavity. When the second pattern 12 is a rectangular pattern or a Class II cavity pattern, one end of the second pattern 12 in the longitudinal direction is provided on the outer surface of the upper wall portion 8, and the other end of the second pattern 12 in the longitudinal direction is provided on the outer surface of the side wall portion 9. Furthermore, the pattern 10 provided on the outer surface of the enamel portion 4 may include a third pattern provided only on the outer surface of the side wall portion 9. Furthermore, the first pattern 11, the second pattern 12, and the third pattern are formed on the enamel portion 4, for example, by printing or laser color printing.

[0033] Due to this configuration, in the dental cutting practice model 1 of this first embodiment, the dentin portion 3, enamel portion 4, and pulp portion 2 are stacked vertically and horizontally. As previously described, the pulp portion 2, the plate-coating portion 6 of the dentin portion 3, and the upper wall portion 8 of the enamel portion 4 have a top-view external shape that mimics the top-view contour of the jaw. Therefore, the dental cutting practice model 1 has a top-view external shape that mimics the top-view contour of the jaw.

[0034] The dental cutting practice model 1 of the first embodiment is preferably formed by injection molding. Thus, the dental cutting practice model 1 can seamlessly integrate the pulp portion 2 and the dentin portion 3, and can seamlessly integrate the dentin portion 3 and the enamel portion 4. Therefore, when the dental cutting practice model 1 is formed by injection molding, moldability can be improved, and manufacturing costs can be reduced.

[0035] The size of the dental cutting practice model 1 in this first embodiment is not particularly limited. For example, the horizontal length of the dental cutting practice model 1 is 50 to 100 mm, the front-back length is 30 to 80 mm, and the thickness is 5 to 30 mm. Furthermore, the thickness of the dentin portion 3 and the enamel portion 4 are not particularly limited. For example, the thickness of the dentin portion 3 is 1 to 5 mm, and the thickness of the enamel portion 4 is 1 to 3 mm.

[0036] Next, an example of how to use the dental cutting practice model 1 according to the first embodiment will be described. FIG4 is a side view showing the dental cutting practice model according to the first embodiment of the present invention attached to an articulator. FIG5 is a side longitudinal sectional view showing the dental cutting practice model according to the first embodiment of the present invention attached to an articulator.

[0037] The dental cutting practice model 1 of the first embodiment can be attached and detached to a conventionally known articulator 13. The articulator 13 includes an upper jaw support portion 14, a lower jaw support portion 15, and a connecting portion 16 connecting the upper jaw support portion 14 and the lower jaw support portion 15.

[0038] The maxillary support portion 14 includes an upper model assembly piece 17 and an upper support piece 18 that supports the upper model assembly piece 17. The upper model assembly piece 17 is generally plate-shaped, with its surface facing in the vertical direction. The upper support piece 18 is a rectangular plate with its longitudinal direction in the front-to-back direction, with its surface facing in the vertical direction. The upper model assembly piece 17 is provided at the front end of the upper support piece 18. The mandibular support portion 15 includes a lower model assembly piece 19 and a lower support piece 20 that supports the lower model assembly piece 19. The lower model assembly piece 19 is generally plate-shaped, with its surface facing in the vertical direction. A magnet 21 is provided at the center of the lower model assembly piece 19. The lower support piece 20 is a rectangular plate with its longitudinal direction in the front-to-back direction, with its surface facing in the vertical direction. The lower model assembly piece 19 is provided on the upper surface of the lower support piece 20. The connecting portion 16 is a rectangular plate with its longitudinal direction in the top-to-bottom direction, with its surface facing in the front-to-back direction. The connecting portion 16 connects the rear end of the upper support piece 18 to the rear end of the lower support piece 20. Specifically, the rear end of the upper support piece 18 is attached to the upper end of the connecting portion 16, and the rear end of the lower support piece 20 is attached to the lower end of the connecting portion 16. When the lower support piece 20 is attached to the connecting portion 16, the lower mold assembly piece 19 and the lower support piece 20 extend obliquely downward from the rear to the front.

[0039] In order to be able to assemble the dental cutting practice model 1 to the articulator 13 of such a structure, the dental cutting practice model 1 has a loading and unloading portion 22 that can be installed and removed relative to the maxillary support portion 14 and the mandibular support portion 15. As shown in Figure 3, the loading and unloading portion 22 includes a metal that is attracted to a magnet by magnetic force and is cylindrical with an opening on one side in the axial direction. The inner hole 23 of the cylindrical loading and unloading portion 22 becomes a threaded hole by forming a thread on the inner surface. The loading and unloading portion 22 is embedded in the dental pulp portion 2. When the loading and unloading portion 22 is embedded in the dental pulp portion 2, the end face 24 on one side in the axial direction of the loading and unloading portion 22 is exposed to the outside. Therefore, when the loading and unloading portion 22 is set in the dental pulp portion 2, it is open to the outside of the dental pulp portion 2. In addition, in the present embodiment 1, the loading and unloading portion 22 is embedded in the dental pulp portion 2 by insert molding.

[0040] As shown in FIG5 , the assembly portion 25 is used when assembling the dental cutting practice model 1 to the maxillary support portion 14. FIG6 is a bottom view showing the assembly portion used when assembling the dental cutting practice model according to the first embodiment of the present invention to the articulator 13. FIG7 is a side longitudinal sectional view showing the assembly portion used when assembling the dental cutting practice model according to the first embodiment of the present invention to the articulator.

[0041] The assembly portion 25 is plate-shaped. The assembly portion 25 has a through hole 26 that passes through in the plate thickness direction. The through hole 26 is a stepped hole having a large diameter hole 27 on one side in the plate thickness direction and a small diameter hole 28 on the other side in the plate thickness direction. A cylindrical magnet 29 is provided in the large diameter hole 27 of the assembly portion 25. When the magnet 29 is provided in the assembly portion 25, the axial direction of the cylindrical magnet 29 is along the axial direction of the large diameter hole 27. The inner hole 30 of the cylindrical magnet 29 passes through in the axial direction. When the magnet 29 is provided in the assembly portion 25, the inner hole 30 of the magnet 29 is connected to the small diameter hole 28. The small diameter hole 28 of the assembly portion 25 becomes a threaded hole by forming threads on the inner surface.

[0042] The dental cutting practice model 1 is set to the maxillary support part 14 via the assembly part 25. The assembly part 25 is set to the upper model assembly piece 17 of the maxillary support part 14 so as to be attachable and detachable. Specifically, in a state where the end surface of the assembly part 25 on the other side in the plate thickness direction is in contact with the lower plate surface of the upper model assembly piece 17, the assembly part 25 is attachable and detachable to the upper model assembly piece 17 by screwing the screw 31 into the small diameter hole 28 of the assembly part 25 through the upper model assembly piece 17. When the assembly part 25 is attached to the upper model assembly piece 17, the magnet 29 of the assembly part 25 is located at the bottom. The dental cutting practice model 1 is set to the assembly part 25 so as to be attachable and detachable. Specifically, the dental cutting practice model 1 is attachable and detachable to the assembly part 25 by the magnetic force of the magnet 29 of the assembly part 25. When the dental cutting practice model 1 is mounted on the mounting portion 25, the enamel portion 4 is positioned below the pulp portion 2 and the dentin portion 3. Thus, the dental cutting practice model 1 is detachably mounted to the upper model mounting piece 17 via the mounting portion 25.

[0043] The dental cutting practice model 1 is set to the mandibular support part 15. As shown in Figure 5, the lower model assembly piece 19 is assembled to the lower support piece 20 by screws 32 so as to be installable and removable. When the lower model assembly piece 19 is assembled to the lower support piece 20, the plate surface of the lower model assembly piece 19 faces the up and down direction. The dental cutting practice model 1 can be assembled to the lower model assembly piece 19 by the magnetic force of the magnet 21 of the lower model assembly piece 19. When the dental cutting practice model 1 is assembled to the lower model assembly piece 19, the enamel part 4 is located above the pulp part 2 and the dentin part 3. In addition, when the dental cutting practice model 1 is assembled to the lower model assembly piece 19, the dental cutting practice model 1 is tilted obliquely downward along the lower model assembly piece 19.

[0044] The dental cutting practice model 1 can be positioned when assembled to the maxillary support portion 14 and the mandibular support portion 15. Therefore, the assembly portion 25 and the mandibular support portion 15 have a plurality of positioning pins 33 and 34. In the case of the assembly portion 25, the positioning pin 33 protrudes from the assembly portion 25 to one side of the plate thickness direction of the assembly portion 25. In the example shown in the figure, the positioning pin 33 is a component separate from the assembly portion 25, but it can also be formed integrally with the assembly portion 25. In the case of the mandibular support portion 15, the positioning pin 34 is provided on the lower model assembly piece 19. The positioning pin 34 protrudes upward from the lower model assembly piece 19 when the lower model assembly piece 19 is assembled to the lower support piece 20. On the other hand, the dental cutting practice model 1 has a plurality of insertion holes 35 for inserting the positioning pins 33 and 34. The insertion hole 35 is provided on the lower surface of the pulp portion 2. In the example shown in the figure, the dental cutting practice model 1 has two insertion holes 35 and 35. The two insertion holes 35 and 35 are arranged apart from each other in the front-back direction.

[0045] Due to this configuration, when the dental cutting practice model 1 is mounted on the mounting portion 25, the positioning pins 33 are inserted into the insertion holes 35. This allows the dental cutting practice model 1 to be positioned relative to the maxillary support portion 14. Furthermore, when the dental cutting practice model 1 is mounted on the lower model mounting piece 19, the positioning pins 34 are inserted into the insertion holes 35. This allows the dental cutting practice model 1 to be positioned relative to the mandibular support portion 15.

[0046] As shown in Fig. 5 , the articulator 13 is installed in the head cover model 36 in a state where the dental cutting practice model 1 is attached. This allows the actual oral cavity to be reproduced.

[0047] In the dental cutting practice model 1 of the first embodiment, the model 1 includes a first pattern 11 provided on the upper wall portion 8 and a second pattern 12 extending from the upper wall portion 8 to the side wall portion 9. Therefore, the dental cutting practice model 1 of the first embodiment allows for easy practice with a simple configuration, both assuming cutting the meshing surface of a tooth and assuming continuous cutting from the meshing surface to the side surfaces of the tooth. This allows for practice assuming cutting adjacent teeth adjacent to a single tooth, and for practice assuming cutting the innermost molar.

[0048] In the dental cutting practice model 1 of the first embodiment, the first pattern 11 includes a pattern that simulates the meshing surface of a tooth, and the second pattern 12 includes a pattern that simulates the contour of the shape to be cut. Therefore, the dental cutting practice model 1 of the first embodiment allows practice to be performed while imagining cutting actual teeth.

[0049] In the case of the dental cutting practice model 1 of the first embodiment, the dental cutting practice model 1 is detachably mounted on the articulator 13. Therefore, the dental cutting practice model 1 of the first embodiment allows practice assuming cutting work within the oral cavity.

[0050] In the case of the dental cutting practice model 1 of the first embodiment, the dental cutting practice model 1 has a top view shape that imitates the top view contour of the jaw. Therefore, the dental cutting practice model 1 of the first embodiment allows practice that imagines a state closer to the cutting operation in the oral cavity.

[0051] In the case of the dental cutting practice model 1 of the first embodiment, a pattern is provided that simulates the actual tooth arrangement when viewed from above. Therefore, according to the dental cutting practice model 1 of the first embodiment, cutting practice can be performed with the feeling of actually cutting human teeth, thereby improving the effectiveness of dental education for dentists and dental school students.

[0052] Next, a dental cutting practice model 1a according to a second embodiment of the present invention will be described. FIG8 is a longitudinal cross-sectional view of a dental cutting practice model according to a second embodiment of the present invention. Components designated with the same reference numerals as those in the first embodiment have the same functions, and therefore their descriptions may be omitted below.

[0053] The dental cutting practice model 1a of this second embodiment further includes a model tooth 37 that mimics the shape of a tooth. The model tooth 37 has the outer shape of a natural tooth. Therefore, the model tooth 37 has a cavity and other features. As shown in FIG8 , a recess 38 opening to the outside is provided at the root of the model tooth 37. Threads are formed at the open end of the recess 38. Thus, the open end of the recess 38 serves as a threaded hole.

[0054] The model tooth 37 is attached to the enamel portion 4 via an attachment member 39 so that it can be attached and detached. Therefore, the dental cutting practice model 1a of this second embodiment has an attachment hole 40 for attaching the model tooth 37. The attachment hole 40 is opened on the upper plate surface of the enamel portion 4. A through-hole 41 is formed at the bottom of the attachment hole 40, through which the attachment member 39 passes. In the illustrated example, the attachment member 39 is a screw. Furthermore, in this second embodiment, the dental cutting practice model 1a has multiple attachment holes 40, but this is not limiting and may also have a single hole.

[0055] Due to this structure, the model tooth 37 can be attached and detached to the attachment hole 40. Specifically, with the model tooth 37 inserted into the attachment hole 40, the attachment member 39 is screwed into the recess 38 of the model tooth 37 via the through hole 41, so that the model tooth 37 can be attached and detached to the attachment hole 40.

[0056] In the dental cutting practice model 1a of the second embodiment, the dental cutting practice model 1a includes a model tooth 37. Therefore, according to the dental cutting practice model 1a of the second embodiment, cutting practice using the model tooth 37 is possible. In the dental cutting practice model 1a of the second embodiment, the model tooth 37 is attachably and detachably mounted in the mounting hole 40. Therefore, according to the dental cutting practice model 1a of the second embodiment, the model tooth 37 can be attached as needed.

[0057] In the example shown, the mounting member 39 is a screw, but is not limited thereto and may also be a magnet. In this case, the magnet is placed on the tooth enamel. On the other hand, a metal member that is attracted to the magnet by magnetic force is placed on the model tooth.

[0058] In addition, the present invention is not limited to the above-described embodiments, and modifications and improvements within the scope that can achieve the object of the present invention are included in the present invention.

[0059] For example, the dental cutting practice models 1 and 1a of the aforementioned embodiments have a three-layer structure comprising a pulp portion 2, a dentin portion 3, and an enamel portion 4. However, the pulp portion 2 may be omitted, or additional layers may be added to form a structure having four or more layers. In other words, the dental cutting practice models 1 and 1a may be configured as long as they have at least a dentin portion 3 and an enamel portion 4.

[0060] In each of the above embodiments, the main component constituting the dentin portion 3 and the main component constituting the enamel portion 4 are melamine resins, but this is not limiting. For example, they may be urea resins. Alternatively, one of the main components constituting the dentin portion 3 and the main components constituting the enamel portion 4 may be melamine resins. In other words, it suffices as long as at least one of the main components constituting the dentin portion 3 and the main components constituting the enamel portion 4 is melamine resin. Alternatively, one of the main components constituting the dentin portion 3 and the main components constituting the enamel portion 4 may be urea resins. In other words, it suffices as long as at least one of the main components constituting the dentin portion 3 and the main components constituting the enamel portion 4 is urea resin.

[0061] In the aforementioned embodiments, the attachment portion 22 is made of metal that is magnetically attracted to a magnet, but the present invention is not limited thereto. For example, the attachment portion may be a threaded hole extending vertically through the dental cutting practice model 1. In this case, the assembly portion 25 is not used. Specifically, the dental cutting practice model 1 is assembled and removably mounted to the articulator 13 by inserting a screw 31 into the threaded hole in the attachment portion.

[0062] DESCRIPTION OF REFERENCE NUMERALS 1 Dental cutting practice model 3 Dentin part 4 Enamel part 8 Upper wall part 9 Side wall part 10 Pattern 11 First pattern 12 Second pattern 13 Articulator 14 Maxillary support part 15 Mandibular support part 16 Connecting part 22 Attaching and detaching part 37 Model tooth 39 Mounting member

Claims

1. A model for dental cutting practice, characterized in that, Comprising: An enamel part, which is box-shaped with an opening downward and has a pattern provided on its outer surface; and A dentin part, which is softer than the enamel part and covers the inner surface of the enamel part, The pattern includes: a first pattern provided on the outer surface of the upper wall part of the enamel part; and a second pattern that is continuous from the outer surface of the upper wall part of the enamel part to the outer surface of the side wall part of the enamel part.

2. The dental cutting practice model according to claim 1, wherein The first pattern includes a pattern imitating the occlusal surface of a tooth, The second pattern includes a pattern imitating the contour of the shape to be cut.

3. The dental cutting practice model according to claim 1 or 2, wherein The dentin part is box-shaped with an opening downward, It further comprises a pulp part covering the inner surface of the dentin part.

4. The dental cutting practice model according to claim 1 or 2, wherein The dental cutting practice model can be mounted on and disassembled from an articulator. The articulator has an upper jaw support part located on the upper side, a lower jaw support part located on the lower side, and a connecting part connecting the upper jaw support part and the lower jaw support part, It has a mounting / dismounting part that can be mounted on and disassembled from the upper jaw support part and the lower jaw support part.

5. The dental cutting practice model according to claim 4, wherein It has a top view outer shape imitating the top view contour of the jaw.

6. The dental cutting practice model according to claim 1 or 2, wherein It comprises model teeth imitating the shape of teeth, The model teeth can be mounted on and disassembled from the enamel part through a fitting member.

Images