Cutting device

Abstract

To provide an inferring device capable of suppressing scattering of tooth pieces to outside.SOLUTION: An inferring device 1 is an inferring device for dividing an evulsion tooth. The inferring device 1 comprises: a body part 10; a first part 20; a second part 30 facing the first part 20; and a guide part contacting the second part 30, in which an opening space is formed of the body part 10, the first part 20 and the second part 30. The first part 20 has a first blade 21, the second part 30 has a second blade 31 facing the first blade 21, and the guide part holds the second blade 31. A top surface of the guide part is positioned above a tip of the second blade 31, the first part 20 is moved in a movement direction along an inner peripheral face of the opening space, and the evulsion tooth is divided in the opening space.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an indexing device, and more particularly, to an indexing device for cracking extracted teeth. [Background technology]

[0002] Generally, when tooth decay is deep and reaches the dental pulp, root canal treatment is performed to remove the dental pulp. When bacteria infect the root canal, infected root canal treatment is performed to remove the infected tooth substance in the root canal. In the past, the gaps in the tooth caused by root canal treatment or infected root canal treatment were sealed with artificial materials. This made it impossible to restore the dental pulp to its original state.

[0003] In recent years, dental pulp regeneration therapy has been proposed. Dental pulp regeneration therapy is a treatment to restore dental pulp by transplanting components containing stem cells into the gap of a tooth caused by root canal treatment or root canal treatment. In dental pulp regeneration therapy, an unnecessary tooth such as a wisdom tooth is extracted, and the dental pulp is extracted from inside the extracted tooth. Stem cells are harvested from the dental pulp, cultured, and then transplanted into the gap of the affected tooth. When extracting the dental pulp from inside the extracted tooth, the extracted tooth is split using an instrument such as forceps.

[0004] For example, Patent Document 1 below discloses a technique for extracting dental pulp from an extracted tooth using tweezers and a reamer. Non-Patent Document 1 below discloses a technique for splitting an extracted tooth in the tooth axis direction using a mallet and a mallet. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] International Publication No. 2011 / 078011 [Non-patent literature]

[0006] [Non-Patent Document 1] Homma Hirofumi et al., "Sealability of root canal filling using Superbond root canal sealer after chemical root canal enlargement," Hokkaido Dental Journal, March 2013, 33(2), p.72-81 Summary of the Invention [Problem to be solved by the invention]

[0007] Extracted teeth are made of enamel and dentin, and are very hard. For this reason, when splitting an extracted tooth, the worker must apply a considerable amount of force to the extracted tooth using an instrument. With conventional methods, there was a problem that tooth fragments would fly off when splitting the extracted tooth due to the force applied to the extracted tooth. Since tooth fragments may contain pathogens, there was a concern that they could cause contamination of extracted teeth.

[0008] In order to prevent contamination of the dental pulp tissue and the extracted stem cells, it is possible to perform the work of splitting the extracted tooth inside an isolator with a sterile interior. However, in this case, it is necessary to completely remove the tooth fragments from inside the isolator and sterilize or make the inside of the isolator aseptic every time an extracted tooth is split. As a result, the work efficiency is reduced.

[0009] The present invention is made to solve the above-mentioned problems, and an object of the present invention is to provide an indexing device that can prevent tooth fragments from scattering to the outside. [Means for solving the problem]

[0010] An indexing device according to one aspect of the present invention is an indexing device for splitting an extracted tooth, comprising a main body portion, a first portion, a second portion opposite the first portion, and a guide portion in contact with the second portion, and has an open space constituted by the main body portion, the first portion, and the second portion, the first portion is provided with a first blade, the second portion is provided with a second blade opposite the first blade, the guide portion sandwiches the second blade, an upper surface of the guide portion is located above the tip of the second blade, the first portion moves in a moving direction along an inner surface of the open space, and the extracted tooth is split in the open space.

[0011] In the above indexing device, the first blade preferably extends linearly when viewed from the second portion side, and the second blade preferably extends linearly when viewed from the first portion side.

[0012] In the above-mentioned indexing device, preferably, when viewed in a cross section normal to the extension direction of the first blade, the tip of the first blade has an acute angle, and when viewed in a cross section normal to the extension direction of the second blade, the tip of the second blade has an acute angle.

[0013] In the above-mentioned indexing device, preferably, the first portion includes a flange portion including a flange surface that is a surface facing an end surface of the main body portion in the moving direction, and an opening protruding from the flange portion toward the second portion. space and a protruding portion including an outer circumferential surface opposing the inner circumferential surface of the flange, the first blade is provided on a surface of the protruding portion opposing the second portion, and the distance from the end face of the main body portion in the movement direction to the tip of the second blade is greater than the distance from the flange surface to the tip of the first blade.

[0014] In the above indexing device, preferably, the outer peripheral surface of the guide portion and the opening space The guide portion is positioned relative to the main body portion by engagement with the inner circumferential surface of the first portion, and the guide portion is positioned relative to the second portion by engagement between the guide portion and the second portion.

[0015] In the above indexing device, the guide portion preferably includes a base and a brush attached to the base and protruding toward the first portion. Effect of the Invention

[0016] According to the present invention, it is possible to provide an indexing device that can prevent tooth fragments from scattering to the outside. [Brief description of the drawings]

[0017] [Figure 1] 1 is a cross-sectional view showing a configuration of an indexing device 1 in one embodiment of the present invention. [Diagram 2] 2 is a diagram showing the configuration of a main body portion 10. FIG. [Diagram 3] 2A and 2B are diagrams showing the configuration of an upper portion 20 and an upper blade 21. [Figure 4] 3A and 3B are diagrams showing the configuration of a lower portion 30 and a lower blade 31. [Diagram 5] 1A and 1B are diagrams showing the configuration of two guide portions 40. FIG. [Figure 6] 1A to 1C are diagrams illustrating a method of using the indexing device 1. [Figure 7] 13A and 13B are diagrams showing modified configurations of the two guide portions 40. FIG. [Figure 8] FIG. 2 is a cross-sectional view showing a configuration of a first modified example of the indexing device 1 in one embodiment of the present invention. [Figure 9] FIG. 4 is a cross-sectional view showing a configuration of a second modified example of the indexing device 1 in one embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0019] [Indexing device configuration]

[0020] FIG. 1 is a cross-sectional view showing a configuration of an indexing device 1 according to an embodiment of the present invention.

[0021] Referring to FIG. 1, the indexing device 1 (an example of an indexing device) is a device for splitting an extracted tooth. The dental pulp is exposed on the cut surface of the extracted tooth split by the indexing device 1. A part of the exposed dental pulp is taken out, and stem cells are harvested from the dental pulp. The harvested stem cells are cultured and then transplanted into the cavity of the affected tooth. The indexing device 1 includes a main body portion 10 (an example of a main body portion), an upper portion 20 (an example of a first portion), a lower portion 30 (an example of a second portion), two guide portions 40 (an example of a guide portion), an upper blade 21 (an example of a first blade), and a lower blade 31 (an example of a second blade). The main body portion 10 includes an opening 11 (an example of an opening). The upper portion 20 is provided with the upper blade 21. The upper portion 20 covers the opening 11. The lower portion 30 is provided with the lower blade 31. The lower blade 31 faces the upper blade 21. As shown by an arrow AR1, the upper portion 20 is movable in a moving direction along the inner circumferential surface 11a of the opening 11. The two guide portions 40 are disposed on the mounting table 32 of the lower portion 30.

[0022] Fig. 2 is a diagram showing the configuration of the main body portion 10. Fig. 2(a) is a top view. Fig. 2(b) is a side view. In Fig. 2(b), the shape of the opening 11 is shown by a dotted line.

[0023] 1 and 2, the main body 10 includes a cylindrical portion 10A and a plate-shaped portion 10B. The cylindrical portion 10A is a member that constitutes the upper portion of the main body 10. The cylindrical portion 10A is provided on the plate-shaped portion 10B. The plate-shaped portion 10B is a member that constitutes the lower portion of the main body 10. The cylindrical portion 10A is detachable from the plate-shaped portion 10B. Making the cylindrical portion 10A detachable from the plate-shaped portion 10B makes it easier to clean and sterilize the inside of the opening 11.

[0024] Cylindrical portion 10A includes upper end surface 13, lower end surface 14, and a through hole. Each of upper end surface 13 and lower end surface 14 is an end surface in the movement direction (direction indicated by arrow AR1) of upper portion 20. Each of upper end surface 13 and lower end surface 14 is a substantially flat surface.

[0025] The opening 11 includes an inner peripheral surface 11a and a bottom surface 12. The opening 11 is composed of a through hole of the cylindrical portion 10A and an upper surface of the plate-shaped portion 10B. The upper surface of the plate-shaped portion 10B is a substantially flat surface and serves as a bottom surface 12 of the opening 11. The opening 11 is formed in an upper end surface 13 and reaches the bottom surface 12.

[0026] The inner peripheral surface 11a extends along the moving direction of the upper portion 20 (the direction indicated by the arrow AR1). The inner peripheral surface 11a includes two arc-shaped surfaces 111 and two protruding surfaces 112. Each of the two arc-shaped surfaces 111 has an arc shape that is part of the same circle when viewed from above the main body portion 10 (FIG. 2(a)). Each of the two protruding surfaces 112 is provided between the two arc-shaped surfaces 111. Each of the two protruding surfaces 112 has a straight line shape when viewed from above the main body portion 10. Each of the two protruding surfaces 112 protrudes inward from the locus of a circle formed by the arcs of the two arc-shaped surfaces 111 when viewed from above the main body portion 10.

[0027] The corners of boundary portions 113 between each of the two arcuate surfaces 111 and each of the two protruding surfaces 112 may be curved (R-processed). A groove (not shown) for positioning the cylindrical portion 10A may be formed in the portion of the plate-like portion 10B where the cylindrical portion 10A is to be disposed.

[0028] 3A and 3B are diagrams showing the configuration of the upper portion 20 and the upper blade 21. Fig. 3(a) is a bottom view, and Fig. 3(b) is a side view.

[0029] 1 and 3, the upper portion 20 includes a flange portion 22 and a protruding portion 23. The flange portion 22 includes a flange surface 22a. The flange surface 22a is a flat surface facing downward. The flange surface 22a faces the upper end surface 13 of the main body portion 10. When no extracted tooth is present between the upper blade 21 and the lower blade 31, the flange surface 22a contacts the upper end surface 13 of the main body portion 10.

[0030] The protruding portion 23 protrudes downward (towards the lower portion 30) from the center of the flange portion 22. The protruding portion 23 includes an outer peripheral surface 23a and a lower surface 23b. The outer peripheral surface 23a faces the inner peripheral surface 11a of the opening 11. When the upper portion 20 moves, it is preferable that the outer peripheral surface 23a of the protruding portion 23 slides against the inner peripheral surface 11a of the opening 11. The outer peripheral surface 23a has a shape corresponding to the inner peripheral surface 11a of the opening 11. The upper portion 20 is positioned relative to the main body portion 10 by the engagement between the outer peripheral surface 23a and the inner peripheral surface 11a of the opening 11.

[0031] The outer peripheral surface 23a includes two arc-shaped surfaces 231 and two protruding surfaces 232. When viewed from below ( FIG. 3(a) ), each of the two arc-shaped surfaces 231 has an arc shape that is part of the same circle. Each of the two protruding surfaces 232 is provided between the two arc-shaped surfaces 231. When viewed from below, each of the two protruding surfaces 232 has a straight line shape. When viewed from below, each of the two protruding surfaces 232 protrudes inward from the locus of a circle formed by the arcs of the two arc-shaped surfaces 231.

[0032] The corners of boundary portions 233 between each of the two arcuate surfaces 231 and each of the two protruding surfaces 232 may be curved (R-processed).

[0033] The lower surface 23b faces the lower portion 30. The lower surface 23b is provided with an upper blade 21. When viewed from below, the upper blade 21 extends in a straight line. When viewed in a cross section normal to the extension direction of the upper blade 21 (FIG. 3(b)), the tip 21a of the upper blade 21 faces downward and has an angle θ1. The angle θ1 is preferably an acute angle, and more preferably is 30 degrees or more and 90 degrees or less. By adopting this angle range, it is possible to efficiently apply force to the extracted tooth while improving the durability of the upper blade 21.

[0034] Fig. 4 is a diagram showing the configuration of the lower portion 30 and the lower blade 31. Fig. 4(a) is a top view, and Fig. 4(b) is a side view.

[0035] 1 and 4, the lower portion 30 includes a mounting base 32. The mounting base 32 is provided on the bottom surface 12 of the main body portion 10. The mounting base 32 includes an outer peripheral surface 32a and an upper surface 32b. The outer peripheral surface 32a has a shape corresponding to the inner peripheral surface 11a of the opening 11. The lower portion 30 is positioned relative to the main body portion 10 by engagement between the outer peripheral surface 32a and the inner peripheral surface 11a of the opening 11.

[0036] The outer peripheral surface 32a includes two arc-shaped surfaces 321 and two protruding surfaces 322. When viewed from above (the upper portion 20 side) (FIG. 4(a)), each of the two arc-shaped surfaces 321 has an arc shape that is part of the same circle. Each of the two protruding surfaces 322 is provided between the two arc-shaped surfaces 321. When viewed from above, each of the two protruding surfaces 322 has a straight line shape. When viewed from above, each of the two protruding surfaces 322 protrudes inward from the locus of a circle formed by the arcs of the two arc-shaped surfaces 321.

[0037] The upper surface 32b is the surface on the upper portion 20 side. The lower blade 31 is provided on the upper surface 32b. The lower blade 31 extends linearly when viewed from above. When viewed in a cross section normal to the extension direction of the lower blade 31 (FIG. 4(b)), the tip 31a of the lower blade 31 faces upward and has an angle θ2. The angle θ2 is preferably an acute angle, and more preferably is 30 degrees or more and 90 degrees or less. By adopting this angle range, it is possible to efficiently apply force to the extracted tooth while improving the durability of the lower blade 31.

[0038] The distance from the upper end surface 13 of the main body 10 to the tip 31a of the lower blade 31 is defined as d1. The distance from the flange surface 22a to the tip 21a of the upper blade 21 is defined as d2. It is preferable that the distance d1 is greater than the distance d2. This makes it possible to prevent the upper blade 21 and the lower blade 31 from coming into contact with each other when there is no extracted tooth between them.

[0039] The mounting table 32 further includes a recess 33. The recess 33 is formed at a certain depth from the upper surface 32b at the boundary between the outer circumferential surface 32a and the upper surface 32b. The recess 33 is formed along the protruding surface 322. The outer circumferential surface 32a is locally recessed inward at the recess 33. The upper surface 32b is locally recessed downward at the recess 33.

[0040] Figure 5 is a diagram showing the configuration of the two guide parts 40. Figure 5(a) is a top view. Figure 5(b) is a side view. In Figure 5(b), the lower blade 31 is shown by a dotted line.

[0041] 1 and 5, the two guide parts 40 are provided at positions sandwiching the lower blade 31 with a gap therebetween when viewed from above (the upper part 20 side) (FIG. 5(a)). Each of the two guide parts 40 includes an outer peripheral surface 41, an upper surface 42, and a lower surface 43. The outer peripheral surface 41 includes two arc-shaped surfaces 411, a protruding surface 412, and a blade side surface 413. When viewed from above (the upper part 20 side) (FIG. 5(a)), each of the two arc-shaped surfaces 411 has an arc shape that is a part of the same circle. Each of the protruding surface 412 and the blade side surface 413 is provided between each of the two arc-shaped surfaces 411. When viewed from above, each of the protruding surface 412 and the blade side surface 413 has a straight line shape. When viewed from above, the protruding surface 412 protrudes inward from the circular locus formed by the arcs of the two arcuate surfaces 331. The blade side surfaces 413 of the two guide portions 40 face each other across the lower blade 31. The corners of the boundary portions 414 between the protruding surface 412 and each of the two arcuate surfaces 411 may be curved (R-processed).

[0042] The upper surface 42 faces the upper portion 20. The upper surface 42 is an end portion of the guide portion 40 on the upper portion 20 side. The upper surface 42 is located above the tip 31a of the lower blade 31 and is closer to the upper portion 20 than the tip 31a of the lower blade 31. This allows the extracted tooth to be stably placed on the lower blade 31. The lower surface 43 is in contact with the upper surface 32b of the mounting table 32.

[0043] Each of the two guide portions 40 further includes a protrusion 46. The protrusion 46 protrudes downward from the lower surface 43 at the boundary between the lower surface 43 and the protruding surface 412. The protrusion 46 is formed along the protruding surface 412. The lower surface 43 locally protrudes downward at the protrusion 46. The protrusion 46 has a shape corresponding to the recess 33 of the lower portion 30.

[0044] Each of the two guide portions 40 is positioned relative to the main body portion 10 by the engagement between the outer peripheral surface 41 of each of the two guide portions 40 and the inner peripheral surface 11a of the opening 11. Furthermore, each of the two guide portions 40 is positioned relative to the lower portion 30 by the engagement between the protrusions 46 of each of the two guide portions 40 and the recesses 33 of the lower portion 30.

[0045] It should be noted that multiple sets of two guide portions 40 may be prepared. The multiple sets of two guide portions 40 each have a different interval s. This allows two guide portions having an appropriate interval s to be selected according to the size of the extracted tooth, and the extracted tooth can be reliably supported.

[0046] In addition, the two guide parts 40 may be integrated with the lower part 30. This improves the operability of the indexing device 1 and reduces the number of parts. Even when the two guide parts 40 and the lower part 30 are integrated, multiple sets of structures in which the two guide parts 40 and the lower part 30 are integrated may be prepared, and one having an appropriate interval s may be selected from the multiple sets of integrated structures.

[0047] Each of the upper blade 21 and the lower blade 31 preferably has a Vickers hardness (HV) of 200 or more. The Vickers hardness is evaluated by a Vickers hardness test specified in the JIS (Japanese Industrial Standards). The hardness of tooth enamel is about 200 Vickers hardness. Therefore, by making each of the upper blade 21 and the lower blade 31 have a Vickers hardness of 200 or more, the upper blade 21 and the lower blade 31 can be made as hard as or harder than tooth enamel. As a result, chipping of the blade can be suppressed. Furthermore, when each of the upper blade 21 and the lower blade 31 is made of stainless steel, the maximum value of the Vickers hardness is about 800. Therefore, it is preferable that each of the upper blade 21 and the lower blade 31 has a Vickers hardness of 800 or less. In particular, by making each of the upper blade 21 and the lower blade 31 have a Vickers hardness of 400 or less, the workability of the upper blade 21 and the lower blade 31 can be ensured.

[0048] The upper blade 21 and the lower blade 31 are made of, for example, stainless steel, Hastelloy, or a titanium alloy.

[0049] In particular, the upper blade 21 and the lower blade 31 are preferably made of, for example, SUS201, SUS202, SUS301, SUS304N1, SUS304N2, SUS304LN, SUS316N, SUS316LN, SUSXM15J1, SUS329J1, SUS447J1, SUSXM27, SUS420J2, SUS420F, SUS431, SUS630, or SUS631 as specified by JIS. The upper blade 21 and the lower blade 31 are preferably made of, for example, Hastelloy, α-β titanium alloy (Ti-6Al-4V), or β titanium alloy (Ti-15-3-3-3). Stainless steel is particularly preferable in terms of cost, workability, and the like. The upper blade 21 and the lower blade 31 may be made of the same material or different materials.

[0050] The members of the indexing device 1 other than the upper blade 21 and the lower blade 31 are made of, for example, stainless steel or plastic. The upper blade 21 and the lower blade 31 and the members of the indexing device 1 other than the upper blade 21 and the lower blade 31 may be made of the same material or may be made of different materials.

[0051] The indexing device 1 can also be defined as follows. The indexing device 1 is an indexing device for splitting an extracted tooth, and includes a housing 91 (an example of a housing) and a splitting portion 92 (an example of a splitting portion) for splitting the extracted tooth inside the housing 91. The splitting portion 92 includes an upper blade 21 and a lower blade 31 that faces the upper blade 21. The housing 91 includes a main body portion 10 including an opening 11, an upper portion 20 in which the upper blade 21 is provided and which covers the opening 11, and a lower portion 30 in which the lower blade 31 is provided. The upper portion 20 is movable in a moving direction along the inner circumferential surface of the opening 11.

[0052] [How to use the indexing device]

[0053] FIG. 6 is a diagram for explaining a method of using the indexing device 1.

[0054] 6(a), an extracted tooth is split using the indexing device 1 in the following manner. First, the indexing device 1 is placed in a sterile isolator (not shown). Next, the upper portion 20 is removed from the opening 11 of the main body portion 10. This exposes the opening 11.

[0055] Next, the extracted tooth TH is placed on the lower blade 31 in the opening 11. For example, the extracted tooth TH is placed so that the tooth axis (direction from the root to the crown) of the extracted tooth TH coincides with the extension direction of the lower blade 31. The extracted tooth TH is supported at three points: the two guide parts 40 and the lower blade 31.

[0056] Next, the upper part 20 is attached to the opening 11 of the main body part 10. The upper part 20 moves downward by its own weight. The upper part 20 stops at a position where the upper blade 21 contacts the upper surface of the extracted tooth TH.

[0057] Next, the upper part 20 and the main body part 10 are pressed from above and below using a press machine (not shown). This applies a compressive force F in the vertical direction to the indexing device 1. The compressive force F is applied to the extracted tooth TH through the upper blade 21 and the lower blade 31. Note that instead of pressing using the press machine, pressing may be performed using a hydraulic jack, or a hammer may be struck against the upper part 20.

[0058] 6(b), the extracted tooth TH is subjected to a compressive force F and breaks. Tooth fragments PL generated when the extracted tooth TH breaks are scattered only inside the space defined by the main body portion 10, the upper portion 20, and the guide portion 40 (the internal space of the opening 11 covered by the upper portion 20). The tooth fragments PL are not scattered outside this space.

[0059] Next, the upper portion 20 is removed from the opening 11 of the main body portion 10. This exposes the opening 11 and the broken extracted tooth TH. The broken extracted tooth TH is then removed from the opening 11, and the dental pulp is taken out from the broken extracted tooth. Thereafter, the indexing device 1 is cleaned and sterilized. Sterilization methods may include an autoclave and a method using hydrogen peroxide gas.

[0060] [Variations]

[0061] Figure 7 shows a modified configuration of the two guide parts 40. Figure 7(a) is a top view. Figure 7(b) is a side view. In Figure 7(b), the lower blade 31 is shown by a dotted line.

[0062] Referring to FIG. 7, in this modification, each of the two guide parts 40 includes a base 44 and a brush 45. The base 44 has a configuration substantially similar to that of the guide part 40 shown in FIG. 5. The brushes 45 are attached at a uniform density over the entire upper surface 44a of the base 44. The brushes 45 protrude upward (towards the upper part 20). The brushes 45 are made of, for example, fiber or metal. The brushes 45 can reduce the impact applied to the extracted tooth. The base 44 is made of, for example, resin. The brushes 45 are made of, for example, PBT (Polybutylene Terephthalate).

[0063] Focus on the upper end portion 45a (end portion on the upper portion 20 side) of each of the guide portions 40. It is preferable that the distance d3 from the upper end portion 45a to the upper portion 20 along the moving direction of the upper portion 20 (direction indicated by arrow AR1) decreases as the upper end portion 45a moves away from the tip 31a of the lower blade 31. This allows the extracted tooth to be stably supported on the lower blade 31 regardless of the size of the extracted tooth.

[0064] [Effects of the embodiment]

[0065] According to the above-described embodiment, the extracted tooth is split in the internal space of the opening 11, which is formed by the main body portion 10, the upper portion 20, and the lower portion 30. This makes it possible to limit the range into which the tooth fragments scatter to the internal space of the opening 11. As a result, it is possible to prevent the tooth fragments from scattering outside the indexing device 1. In addition, when splitting the extracted tooth, the work can be easily performed in a small space.

[0066] In addition, the extracted tooth can be stably supported by providing the two guide portions 40. As a result, the extracted tooth can be easily split along the desired cutting line.

[0067] [others]

[0068] The two guide parts may have the configuration shown in Fig. 5, or may be gauze or silicone putty placed on the lower part 30. The two guide parts may also be configured to sandwich the extracted tooth horizontally.

[0069] The indexing device of the present invention is an indexing device for splitting an extracted tooth, and may include a housing and a splitting portion for splitting the extracted tooth inside the housing. In addition to the configuration of the above-mentioned embodiment, the indexing device may have the following first and second modified configurations.

[0070] FIG. 8 is a cross-sectional view showing a configuration of a first modified example of the indexing device 1 in one embodiment of the present invention.

[0071] 8, the indexing device 1 of this modified example includes a housing 91 (an example of a housing) and a splitting portion 92 (an example of a splitting portion). The splitting portion 92 is for splitting the extracted tooth TH inside the housing 91.

[0072] The housing 91 includes a housing body 91a and a door 91b. The housing body 91a has, for example, a rectangular parallelepiped shape and includes a hole 91c, an internal space 91d, an opening 91e, and a guide 91f. The hole 91c is provided in the upper part of the housing body 91a. A screw groove is formed on the inner peripheral surface of the hole 91c. The opening 91e is provided on the side of the housing body 91a. The guide 91f extends from the upper surface of the internal space 91d of the housing body 91a to near the upper surface of the lower blade 92d. The guide 91f covers the left and right side surfaces of the upper blade 92c in FIG. 8. The door 91b is provided in the opening 91e. The door 91b can be opened and closed. When the door 91b is closed, the opening 91e is covered by the door 91b, and the internal space 91d is substantially shielded from the outside. When the door 91b is open, the internal space 91d is exposed to the outside through the opening 91e. In order to reduce an increase in pressure in the internal space 91d when the door 91b is closed, the housing 91 may further include a hole (not shown) that connects the inside and outside of the housing main body 91a.

[0073] The split portion 92 includes a screw portion 92a, a handle 92b, an upper blade 92c, a lower blade 92d, and a joint 92e. A screw groove is formed on the outer peripheral surface of the screw portion 92a. The screw portion 92a is screwed into a hole 91c. The screw portion 92a penetrates the hole 91c. The handle 92b is attached to the upper end of the screw portion 92a outside the housing 91. The upper blade 92c is provided at the lower end of the screw portion 92a. The upper blade 92c is attached to the screw portion 92a via a joint 92e. When the screw portion 92a rotates, the joint 92e rotates only the screw portion 92a without rotating the upper blade 92c. When the handle 92b is rotated counterclockwise, the upper blade 92c descends and approaches the lower blade 92d. When the handle 92b is rotated clockwise, the upper blade 92c rises and moves away from the lower blade 92d. The lower blade 92d is provided on the bottom surface of the internal space 91d in the housing body 91a. The lower blade 92d faces the upper blade 92c. Each of the upper blade 92c and the lower blade 92d extends linearly in a direction perpendicular to the paper surface.

[0074] The indexing device 1 of this modified example is used to split an extracted tooth in the following manner. First, the indexing device 1 is placed in a sterile isolator (not shown). Next, the door 91b is opened, and the extracted tooth TH is placed on the lower blade 92d through the opening 91e. At this time, the extracted tooth TH is placed so that, for example, the tooth axis of the extracted tooth TH (the direction from the root to the crown) coincides with the extension direction of the lower blade 92d. Next, the door 91b is closed.

[0075] Next, the upper blade 92c is lowered by rotating the handle 92b counterclockwise. In the unlikely event that the upper blade 92c receives a rotational force from the threaded portion 92a and attempts to rotate, the upper blade 92c is caught by the guide 91f. This reliably prevents the upper blade 92c from rotating together with the rotation of the threaded portion 92a. The upper blade 92c is accurately positioned relative to the lower blade 92d. After the upper blade 92c comes into contact with the extracted tooth TH, the handle 92b is rotated counterclockwise. This causes a compressive force to be applied to the extracted tooth TH through the upper blade 92c and the lower blade 92d.

[0076] The extracted tooth TH is subjected to this compressive force and breaks. The tooth fragments generated when the extracted tooth TH breaks are scattered only into the internal space 91d. The tooth fragments are not scattered outside the housing 91.

[0077] Next, the door 91b is opened. This exposes the broken extracted tooth TH. The broken extracted tooth TH is then taken out from the opening 91e, and the dental pulp is taken out from the broken extracted tooth. After that, the indexing device 1 is cleaned and sterilized.

[0078] FIG. 9 is a cross-sectional view showing a configuration of a second modified example of the indexing device 1 in one embodiment of the present invention.

[0079] Referring to FIG. 9, in the indexing device 1 of this modified example, the dividing portion 92 includes a rod-shaped portion 92f, an upper blade 92c, a lower blade 92d, a rack 92g, and a pinion 92h. The rod-shaped portion 92f penetrates a hole 91c. The upper blade 92c is provided at the lower end of the rod-shaped portion 92f. A rack 92g is formed on the outer peripheral surface of the portion of the rod-shaped portion 92f that is present outside the housing 91. The pinion 92h meshes with the rack 92g. The pinion 92h is driven to rotate by a motor (not shown) or the like. When the pinion 92h is rotated counterclockwise, the upper blade 92c descends and approaches the lower blade 92d. When the pinion 92h is rotated clockwise, the upper blade 92c ascends and moves away from the lower blade 92d. The lower blade 92d is provided on the bottom surface of the internal space 91d in the housing body 91a. The lower blade 92d faces the upper blade 92c. Each of the upper blade 92c and the lower blade 92d extends linearly in a direction perpendicular to the paper surface.

[0080] The indexing device 1 of this modified example is used to split an extracted tooth in the following manner. First, the indexing device 1 is placed in a sterile isolator (not shown). Next, the door 91b is opened, and the extracted tooth TH is placed on the lower blade 92d through the opening 91e. At this time, the extracted tooth TH is placed so that, for example, the tooth axis of the extracted tooth TH (the direction from the root to the crown) coincides with the extension direction of the lower blade 92d. Next, the door 91b is closed.

[0081] Next, the pinion 92h is rotated counterclockwise to lower the upper blade 92c. After the upper blade 92c comes into contact with the extracted tooth TH, the pinion 92h is rotated counterclockwise. As a result, a compressive force is applied to the extracted tooth TH through the upper blade 92c and the lower blade 92d.

[0082] The extracted tooth TH is subjected to this compressive force and breaks. The tooth fragments generated when the extracted tooth TH breaks are scattered only into the internal space 91d. The tooth fragments are not scattered outside the housing 91.

[0083] Next, the door 91b is opened. This exposes the broken extracted tooth TH. The broken extracted tooth TH is then taken out from the opening 91e, and the dental pulp is taken out from the broken extracted tooth. After that, the indexing device 1 is cleaned and sterilized.

[0084] The configuration of the indexing device 1 in this modified example other than as described above is similar to that of the first modified example, and therefore the description thereof will not be repeated.

[0085] According to the first and second modified examples, the extracted tooth TH is split inside the housing 91, so that it is possible to prevent tooth fragments from scattering outside the indexing device 1. In addition, when splitting the extracted tooth TH, the work can be easily performed in a small space.

[0086] As another modified example, the indexing device may include a bag-shaped housing and a splitter for splitting the extracted tooth inside the housing. The splitter may be formed of forceps or the like.

[0087] The above-described embodiments and modifications can be combined as appropriate.

[0088] The above-described embodiments and modifications should be considered as illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims, not the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0089] 1 Indexing device (Example of an indexing device) 10 Main body part (example of main body part) 10A Cylindrical part 10B Plate-shaped part 11 Opening in the main body (example of opening) 11a Inner surface of opening 12 Bottom of the opening 13 Top surface of main body 14 Bottom surface of main body 20 Upper part (an example of the first part) 21,92c Upper blade (example of the first blade) 21a Tip of upper blade 22 Flange part 22a Flange surface 23 Protruding part 23a Outer surface of protruding part 23b Bottom surface of protruding part 30 Lower part (an example of the second part) 31,92d Lower blade (an example of a second blade) 31a Tip of lower blade 32 Placement table 32a Outer periphery of the mounting table 32b Top surface of the mounting table 33 Recessed portion of the mounting table 40 Guide part (example of guide part) 41 Outer surface of guide part 42 Top surface of guide part 43 Underside of guide part 44 Base of guide part 44a Top surface of base 45 Guide brush 45a Upper end of brush 46 Convex part of guide 91 Case (Example of case) 91a Main unit 91b Door 91c hole 91d Internal space of the housing 91e Opening of the housing body 91f Guide 92 Split section (example of split section) 92a Threaded part 92b Handle 92e Joint 92f Rod-shaped part 92g rack 92h Pinion 111,231,321,411 arcuate surface 112,232,322,412 Projecting surface 113,233,323,414 Boundary part 413 Blade side F Compression force PL tooth piece TH Extracted tooth

Claims

1. 1. An indexing device for indexing an extracted tooth, comprising: A main body part, A first portion; and a second portion opposite the first portion; a guide portion in contact with the second portion, an opening space defined by the main body portion, the first portion, and the second portion; The first portion is provided with a first blade; the second portion is provided with a second blade opposing the first blade, The guide portion sandwiches the second blade, an upper surface of the guide portion is located above a tip of the second blade, the first portion moves in a moving direction along an inner circumferential surface of the opening space, The extracted tooth is split in the open space. Indexing device.

2. The first blade extends linearly when viewed from the second portion side, The second blade extends linearly when viewed from the first portion side. The indexing device of claim 1.

3. When viewed in a cross section normal to a direction in which the first blade extends, a tip of the first blade has an acute angle, When viewed in a cross section normal to the extension direction of the second blade, the tip of the second blade has an acute angle. The indexing device according to claim 1 or 2.

4. The first portion is a flange portion including a flange surface that is a surface facing an end surface of the main body portion in the moving direction; a protruding portion protruding from the flange portion toward the second portion and including an outer circumferential surface facing an inner circumferential surface of the opening space, the first blade is provided on a surface of the protruding portion facing the second portion, a distance from an end face of the main body in the moving direction to a tip of the second blade is greater than a distance from the flange surface to a tip of the first blade; The indexing device according to any one of claims 1 to 3.

5. The guide portion is positioned relative to the main body portion by an engagement between an outer peripheral surface of the guide portion and an inner peripheral surface of the opening space, The guide portion is positioned relative to the second portion by engagement between the guide portion and the second portion. The indexing device according to any one of claims 1 to 4.

6. The guide portion is A base and a brush attached to the base and projecting toward the first portion; The indexing device according to claim 5.

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