dental model

Abstract

The purpose of the present invention is to provide a dental model suitable for practical training when a lesion occurs in each region. A dental model 1 according to the present invention comprises: a teeth base part 10; an alveolar bone part 20 that is attachable to and detachable from the teeth base part 10 and provided with a plurality of insertion holes 23; a gum part 30 that is attachable to and detachable from the alveolar bone part 20 and provided with a plurality of insertion holes 33 at positions overlapping openings of the insertion holes 23; and a plurality of model teeth 40 that are directly attachable to and detachable from the insertion holes 23, respectively, in a state where the gum part 30 is not attached to the alveolar bone part 20 and are, through the insertion holes 33, attachable to and detachable from the insertion holes 23, respectively, in a state where the gum part 30 is attached to the alveolar bone part 20, and each have a tooth crown part 41 that is exposed from the insertion hole 23 and a tooth root part 42 that is inserted in the insertion hole 23 when being inserted in the insertion hole 23. The plurality of insertion holes 23 include a branch insertion hole 23A the interior of which branches into a plurality of branch holes, and the model teeth 40 include a branch model tooth 40A the tooth root part 42 of which branches into a plurality of branch root parts to be respectively inserted in the branch holes.

Description

[Technical Field]

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

[0002] Dental models are used for various practical training at dental educational institutions (dental universities, hygienist schools, dental technician schools), dental clinics, dental seminars, etc. Conventional dental models include a model tooth with a crown and root, a tooth base with insertion holes arranged along the tooth row into which the roots of the model teeth can fit, and model gingiva that covers the tooth base and has through holes arranged along the tooth row into which the roots can fit. The insertion holes and through holes are connected, and the roots of the model teeth are inserted into these insertion holes and through holes (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-000628 Summary of the Invention [Problem to be solved by the invention]

[0004] However, conventional dental models differ in shape from actual teeth and are therefore limited in their usefulness for practical training in cases where lesions occur in various areas.

[0005] Therefore, an object of the present invention is to provide a dental model suitable for practical training in cases where lesions occur in various parts. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, the present invention provides a dental model comprising: a tooth base portion; an alveolar bone portion detachable from the tooth base portion and having a plurality of insertion holes; a gingival portion detachable from the alveolar bone portion and having a plurality of insertion holes at positions that overlap with the openings of the insertion holes when attached to the alveolar bone portion; and a plurality of model teeth that are detachable through the insertion holes to each of the insertion holes when the gingival portion is attached to the alveolar bone portion, and that have crown portions exposed from the insertion holes and root portions to be inserted into the insertion holes when inserted into the insertion holes, wherein the plurality of insertion holes include branched insertion holes whose interiors are branched into a plurality of branch holes, and the model teeth include branched model teeth whose root portions are branched into a plurality of branch root portions that can be inserted into each of the branch holes.

[0007] At least one of the branch holes in one of the insertion holes may be a through hole, and at least one of the branch root portions of the model tooth to be inserted into the through hole may be provided with a screw hole extending from its tip toward the crown portion, and a screw insertion hole may be provided in the tooth base portion at a position corresponding to the through hole, so that a screw can be threaded into the screw hole from the back surface of the tooth base portion through the screw insertion hole.

[0008] The branch root portion of one of the model teeth in which the screw hole is provided may be the thickest branch root portion of the branch root portions of the model tooth.

[0009] An alveolar bone side step portion may be provided on the alveolar bone side attachment / detachment surface of the alveolar bone portion that is attached and detached to the tooth base portion, and a tooth base side step portion into which the alveolar bone side step portion fits may be provided on the tooth base side attachment / detachment surface of the tooth base portion to which the alveolar bone portion is attached and detached.

[0010] The length of the root portion of the model tooth may correspond to the length of the root portion of an actual tooth, the depth of the insertion holes in the alveolar bone portion may correspond to the length of the root portion into which each is inserted, and the alveolar bone side step portion may be provided to correspond to the depth of the insertion hole.

[0011] The tooth model may have a crown portion and a root portion that are different in color. [Effects of the Invention]

[0012] According to the present invention, a dental model suitable for practical training in the case where a lesion occurs in each part can be provided. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is an overall perspective view of a dental model 1 according to an embodiment of the present invention. [Figure 2] FIG. 1D is a perspective view of a lower dental model 1D. [Figure 3] FIG. 1 is an exploded perspective view of a lower dental model 1D. [Figure 4] FIG. 2 is a top view of the alveolar bone portion 20 without the tooth model 40 attached. [Figure 5] FIG. 2 is a perspective view of the alveolar bone portion 20 as seen from below. [Figure 6] FIG. 2 is a view showing a state in which the alveolar bone portion 20 is placed on the tooth base portion 10. [Figure 7] FIG. 10 is a top perspective view of the alveolar bone portion 20 of the upper dental model 1U. [Figure 8] FIG. 1 is a perspective view showing a model tooth 40 of a first molar in an upper dental model 1U. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is an overall perspective view of a dental model 1 according to an embodiment of the present invention. The dental model 1 of the embodiment includes a lower dental model 1D and an upper dental model 1U. However, the dental model 1 may be either the lower dental model 1D or the upper dental model 1U.

[0015] (Lower dental model 1D) First, the lower dental model 1D will be described. Fig. 2 is a perspective view of the lower dental model 1D. Fig. 3 is an exploded perspective view of the lower dental model 1D. The lower dental model 1D comprises a tooth base portion 10, an alveolar bone portion 20 detachable from the tooth base portion 10, a gingiva portion 30 detachable from the alveolar bone portion 20, a plurality of model teeth 40 detachable from the alveolar bone portion 20, and a tongue portion 50 detachable from the alveolar bone portion 20. Fig. 3 shows a state in which one model tooth 40 has been removed and the remaining model teeth 40 have been inserted into the alveolar bone portion 20.

[0016] In the following description, as shown in Figure 2, the tongue side of the dental model 1 where the tongue portion 50 is present will be referred to as the inside, and the opposite side, the side where the cheeks and lips would be in an actual mouth, will be referred to as the outside. Also, as shown in the figure, the front teeth side will be defined as the front side, and the back teeth side will be defined as the back side. Furthermore, regardless of whether it is a lower dental model 1D or an upper dental model 1U, the side of the tooth base portion 10 will be referred to as the lower side, and the side of the model teeth 40 will be referred to as the upper side.

[0017] (Tooth base 10) The tooth base portion 10 is a support base having a substantially semi-elliptical cross section perpendicular to the vertical direction, to which the alveolar bone portion 20 is detachable, and on which the entire lower dental model 1D can be placed on a flat surface. The tooth base portion 10 has tooth base side steps 11, which are U-shaped and have different heights along the tooth row, on the tooth base side detachable surface 15 to which the alveolar bone portion 20 is detachable. The tooth base side steps 11 are symmetrical, with eight steps on each side, for a total of 16 steps.

[0018] The eight steps of the tooth base-side step portions 11 on either the left or right side comprise, from the front side, a tooth base-side central incisor step portion 11a, a tooth base-side lateral incisor step portion 11b that is recessed (concave) from the tooth base-side central incisor step portion 11a, a tooth base-side canine step portion 11c that is recessed from the tooth base-side lateral incisor step portion 11b, a tooth base-side first premolar step portion 11d that protrudes from the tooth base-side canine step portion 11c, a tooth base-side second premolar step portion 11e that is recessed from the tooth base-side first premolar step portion 11d, a tooth base-side first molar step portion 11f that is recessed from the tooth base-side second premolar step portion 11e, a tooth base-side second molar step portion 11g that protrudes from the tooth base-side first molar step portion 11f, and a tooth base-side third molar step portion 11h that protrudes from the tooth base-side second molar step portion 11g.

[0019] Each tooth-base-side step 11 is provided with a screw insertion hole 12. A tooth-fixing screw 17 can be inserted into the screw insertion hole 12 from the underside of the tooth base portion 10, and can be screwed into a screw hole 43 (described below) provided in a tooth model 40 attached to the alveolar bone portion 20.

[0020] As shown in Figure 3, one tooth-base-side step 11 has a portion where two screw insertion holes 12 are formed. This is because this tooth-base 10 can accommodate both an alveolar bone portion to which a single-rooted tooth abstracted as a model tooth can be attached, and an alveolar bone portion 20 to which a furcation tooth model 40A with clinical furcation roots, as shown in the embodiment, can be attached. The optimal screw insertion holes 12 differ between a single-rooted tooth and a furcation tooth model 40A, so two screw insertion holes 12 are provided. In addition, in the tooth-base-side third molar step 11h, the two screw insertion holes 12 for the single-rooted tooth and the furcation tooth are close to each other, so the two screw insertion holes 12 are connected to form an elongated hole.

[0021] In this embodiment, two screw insertion holes 12 are connected to form an elongated hole in the tooth-base-side third molar step 11h, but the portion where an elongated hole can be formed is not limited to the tooth-base-side third molar step 11h. That is, an elongated hole in which two screw insertion holes are connected may be formed in another tooth-base-side step. Furthermore, three or more screw insertion holes may be formed in one tooth-base-side step, and these three or more screw insertion holes may be connected to form an elongated hole. Furthermore, the shape of the screw insertion hole is not limited to a circle or an elongated hole. That is, the shape of the screw insertion hole may be a polygonal shape such as a square or a triangle, or may be another shape.

[0022] (Alveolar bone 20) 4 is a top view of the alveolar bone portion 20 without the attached tooth model 40. The alveolar bone portion 20 corresponds to an actual alveolar bone, protrudes upward in a mountain-like shape, and is U-shaped in cross section perpendicular to the vertical direction.

[0023] (insertion hole 23) A plurality of insertion holes 23 into which a plurality of model teeth 40 can be inserted are provided at the peaks of the mountain shape in the alveolar bone portion 20. The depth of the insertion holes 23 roughly corresponds to the length of the root portion 42 of the model tooth 40 into which each is inserted. The shape of the insertion holes 23 roughly corresponds to the shape of the root portion 42 of the model tooth 40 into which each is inserted. That is, the insertion holes 23 into which the model teeth 40 of the first molars, second molars, and third molars are inserted are branched insertion holes 23A branched into two branch holes, and the insertion holes 23 into which the other model teeth 40 are inserted are non-branched insertion holes 23B. Furthermore, the largest branch hole of at least one branched insertion hole 23A is a through hole 231.

[0024] (Alveolar bone lateral step 21) 5 is a perspective view of the alveolar bone portion 20 viewed from below with one model tooth 40 removed and the remaining model teeth 40 inserted into the alveolar bone portion 20. An alveolar bone side step portion 21 is provided on the alveolar bone side detachable surface 25 of the alveolar bone portion 20, which is attached to and detached from the tooth base portion 10.

[0025] The alveolar bone side step 21 is provided to correspond to the depth of each insertion hole 23 formed in the alveolar bone portion 20. That is, the longer the root portion 42 of the model tooth 40 to be inserted, the more protruding the alveolar bone side step 21 provided on the lower surface of the insertion hole 23. In other words, the shorter the root portion 42 of the model tooth 40 to be inserted, the more recessed the alveolar bone side step 21 provided on the lower surface of the insertion hole 23.

[0026] Specifically, the alveolar bone side step portion 21 is provided symmetrically on both sides, with eight steps on each side, for a total of 16 steps. The eight alveolar bone side step portions 21 on either the left or right side are, from the front side, an alveolar bone side central incisor step portion 21a, an alveolar bone side lateral incisor step portion 21b that protrudes (is convex) from the alveolar bone side central incisor step portion 21a, an alveolar bone side canine step portion 21c that protrudes from the alveolar bone side lateral incisor step portion 21b, an alveolar bone side first premolar step portion 21d that is recessed from the alveolar bone side canine step portion 21c, and an alveolar bone side canine step portion 21d. It includes an alveolar bone-side second premolar step 21e that protrudes from the bone-side first premolar step 21d, an alveolar bone-side first molar step 21f that protrudes from the alveolar bone-side second premolar step 21e, an alveolar bone-side second molar step 21g that is recessed from the alveolar bone-side first molar step 21f, and an alveolar bone-side third molar step 21h that is recessed from the alveolar bone-side second molar step 21g.

[0027] The convex and concave portions of the tooth base side step 11 correspond to the convex and concave portions of this alveolar bone side step 21. That is, when the alveolar bone side step 21 corresponding to the same tooth is concave, the tooth base side step 11 is convex, and when the alveolar bone side step 21 is convex, the tooth base side step 11 is concave.

[0028] The alveolar bone-side step 21 of the alveolar bone portion 20 is placed on the tooth-plate side step 11 provided on the tooth-plate portion 10. That is, the alveolar bone-side central incisor step 21a, which is recessed from the left and right alveolar bone-side lateral incisor step 21b, is placed on the tooth-plate side central incisor step 11a, which protrudes from the left and right tooth-plate side lateral incisor step 11b. The alveolar bone-side lateral incisor step 21b, which protrudes from the alveolar bone-side central incisor step 21a, is placed on the tooth-plate side lateral incisor step 11b, which is recessed from the tooth-plate side central incisor step 11a. The alveolar bone-side canine step 21c, which protrudes from the alveolar bone-side lateral incisor step 21b, is placed on the tooth-plate side canine step 11c, which is recessed from the tooth-plate side lateral incisor step 11b. The alveolar bone-side first premolar step 21d, recessed from the alveolar bone-side canine step 21c, is placed on the table-side first premolar step 11d, protruding from the table-side canine step 11c. The alveolar bone-side second premolar step 21e, protruding from the alveolar bone-side first premolar step 21d, is placed on the table-side second premolar step 11e, recessed from the table-side first premolar step 11d. The alveolar bone-side first molar step 21f, protruding from the alveolar bone-side second premolar step 21e, is placed on the table-side first molar step 11f, recessed from the table-side second premolar step 11e. The alveolar bone-side second molar step 21g, recessed from the alveolar bone-side first molar step 21f, is placed on the table-side second molar step 11g, which protrudes from the table-side first molar step 11f. The alveolar bone-side third molar step 21h, recessed from the alveolar bone-side second molar step 21g, is placed on the table-side third molar step 11h, which protrudes from the table-side second molar step 11g.

[0029] FIG. 6 is a diagram showing the state in which the alveolar bone portion 20 has been placed on the tooth table portion 10. When the alveolar bone portion 20 is placed on the tooth table portion 10, the alveolar bone side step 21 of the alveolar bone portion 20 is placed on the tooth table side step 11 provided on the tooth table portion 10. In this case, if the alveolar bone side step 21 is concave, the tooth table side step 11 on which the alveolar bone side step 21 should be placed is convex. If the alveolar bone side step 21 is convex, the tooth table side step 11 on which the alveolar bone side step 21 should be placed is concave. Therefore, if the positions of the alveolar bone side step 21 and the tooth table side step 11 are misaligned, they cannot fit together. As shown in FIG. 6, the alveolar bone portion 20 fits onto the tooth table portion 10 only when the positions of the alveolar bone side step 21 and the tooth table side step 11 are aligned.

[0030] (Gum area 30) The gum portion 30 shown in Fig. 3 is formed of a flexible material. The gum portion 30 is detachable from the alveolar bone portion 20, and covers the outer surface of the alveolar bone portion 20 when attached to the alveolar bone portion 20. Furthermore, the gum portion 30 has a plurality of insertion holes 33 at positions that overlap with the openings of the insertion holes 23 when attached to the alveolar bone portion 20.

[0031] (40 tooth models) The model teeth 40 can be attached and detached directly to each of the insertion holes 23 when the gum portion 30 is not attached to the alveolar bone portion 20, and can be attached and detached by passing the insertion holes 33 of the gum portion 30 through each of the insertion holes 23 when the gum portion 30 is attached to the alveolar bone portion 20.

[0032] The tooth model 40 has a crown portion 41 exposed from the insertion hole 23 when inserted into the insertion hole 23 and a root portion 42 inserted into the insertion hole 23 .

[0033] (Tooth crown 41) The crown portion 41 is a portion that is exposed from the gum portion 30 when the tooth model 40 is inserted into the insertion hole 23 of the alveolar bone portion 20 .

[0034] (root 42) The root portion 42 is inserted into the insertion hole 23 with the tooth model 40 fixed to the alveolar bone portion 20 , and is covered by the alveolar bone portion 20 and the gum portion 30 . The model tooth 40 includes a branched model tooth 40A in which a root portion 42 is branched into two branch root portions that are inserted into respective branch holes, similar to an actual tooth root. As shown in Fig. 5, the thickest branch root portion 42a of one of the branch root portions in one branched model tooth 40A has a screw hole 43 with a threaded groove on its inner surface extending from the tip toward the crown portion 41. As shown in Fig. 3, a tooth-fixing screw 17 is inserted through the screw insertion hole 12 from the underside of the tooth base portion 10 and threaded into the screw hole 43 provided in the model tooth 40 attached to the alveolar bone portion 20, thereby fixing the model tooth 40 attached to the tooth base portion 10.

[0035] When the root portion 42 is inserted into the insertion hole 23 with the gum portion 30 covering the alveolar bone portion 20, it is covered by the gum portion 30 and is not exposed to the outside. However, when the root portion 42 is inserted into the insertion hole 23 without being covered by the gum portion 30, a part of the crown portion 41 side of the root portion 42 is exposed to the outside.

[0036] The length of the root 42 corresponds to the length of the root 42 of an actual tooth. The tooth models 40 corresponding to the first, second, and third molars have different colors for the crown 41 and the root 42. In this embodiment, the crown 41 is milky white, and the root 42 is more yellowish than the crown 41.

[0037] (tongue 50) As shown in Figure 3, a screw hole 51 is provided in the deepest part of the tongue portion 50. A tongue-fixing screw 52 is inserted into the screw hole 51 from above and threaded into the tongue-fixing screw hole 16 provided in the tooth base portion 10, thereby fixing the tongue portion 50 to the tooth base portion 10 with the gum portion 30 sandwiched between them.

[0038] (Upper dental model 1U) Next, the upper dental model 1U will be described, but the same parts as those in the lower dental model 1D will be assigned the same reference numerals and the description thereof will be omitted.

[0039] 7 is a top perspective view of the alveolar bone portion 20 of the upper dental model 1U, showing a model tooth 40 attached to the left side when viewed from the front, but no model tooth 40 attached to the right side. The upper dental model 1U includes branch insertion holes 23A like the lower dental model 1D, but differs from the lower dental model 1D in that it includes two branch holes and three branch holes. The insertion holes 23 into which the model teeth 40 of the first molars, second molars, and third molars are inserted are branch insertion holes 23A branched into three branch holes, and the insertion hole 23 into which the model teeth 40 of the canines are inserted is branch insertion hole 23A branched into two branch holes.

[0040] 8 is a perspective view showing a first molar model tooth 40 as an example of the first molar model tooth 40, the second molar model tooth 40, and the third molar model tooth 40 in the upper dental model 1U. The root portion 42 of the first molar model tooth 40, which is a branched model tooth 40A, is branched into three branch root portions that are inserted into three branch holes, and the thickest of the branch root portions, branch root portion 42a, has a screw hole 43 with a threaded groove on its inner surface extending from the tip toward the crown portion 41. A tooth-fixing screw 17 is threadedly engaged with the screw hole 43, thereby fixing the model tooth 40 to the tooth base portion 10 with the alveolar bone portion 20 sandwiched therebetween.

[0041] According to these embodiments, the following effects can be obtained. The alveolar bone portion 20 is detachable from the dental base portion 10, and the gingiva portion 30 is detachable from the alveolar bone portion 20. Therefore, in addition to the alveolar bone portion 20 and the gingiva portion 30 in a normal state, a plurality of alveolar bone portions 20 and gingiva portions 30 in a partially deformed or recessed state can be prepared and replaced depending on, for example, the lesion.

[0042] In this embodiment, the root portion 42 of the molar model tooth 40 or the like is branched into two branch root portions that are inserted into the branch holes, respectively, in the same manner as an actual tooth root.

[0043] Therefore, when the alveolar bone portion 20 or gingival portion 30 is replaced with a portion that has been deformed or receded depending on the lesion, the exposed root portion 42 is close to the state of the root of an actual tooth. Therefore, when conducting practical training on periodontal disease, etc. at dental educational institutions (dental universities, hygienist schools, dental technician schools), dental clinics, dental seminars, etc., it is possible to conduct training that is close to clinical conditions.

[0044] At least one of the branch holes in each insertion hole 23 in the alveolar bone portion 20 is a through-hole 231. At least one of the branch root portions of each model tooth 40 that is inserted into the through-hole 231 is provided with a screw hole 43 that extends from the tip toward the crown portion 41. The tooth base portion 10 is provided with a screw insertion hole 12 at a position that corresponds to the through-hole 231. A tooth-fixing screw 17 can be threaded into the screw hole 43 of the model tooth 40 by inserting the screw insertion hole 12 from the back surface of the tooth base portion 10. This allows each tooth model 40 to be fixed to the tooth base portion 10 and the alveolar bone portion 20 without affecting the appearance. Also, each tooth model 40 can be attached and detached to the tooth base portion 10 and the alveolar bone portion 20 individually.

[0045] The branch root portion of one tooth model 40 where the screw hole 43 is provided is the thickest branch root portion of the branch root portions of the tooth model 40. Therefore, it is easy to form the tooth-fixing screw 17 therein.

[0046] An alveolar bone side step 21 is provided on the alveolar bone side attachment / detachment surface 25 of the alveolar bone portion 20, which is attached to and detached from the tooth base portion 10, and a tooth base side step 11, into which the alveolar bone side step 21 fits, is provided on the tooth base side attachment / detachment surface 15 of the tooth base portion 10, to which the alveolar bone portion 20 is attached and detached. The convex and concave portions of the tooth base side step 11 correspond to the convex and concave portions of the alveolar bone side step 21. In other words, when the alveolar bone side step 21 corresponding to the same tooth is concave, the tooth base side step 11 is convex, and when the alveolar bone side step 21 is convex, the tooth base side step 11 is concave.

[0047] When the alveolar bone portion 20 is placed on the tooth table portion 10, the alveolar bone side step 21 of the alveolar bone portion 20 is placed on the tooth table side step 11 provided on the tooth table portion 10. At this time, if the alveolar bone side step 21 is concave, the tooth table side step 11 on which the alveolar bone side step 21 should be placed is convex. If the alveolar bone side step 21 is convex, the tooth table side step 11 on which the alveolar bone side step 21 should be placed is concave. Therefore, if the positions of the alveolar bone side step 21 and the tooth table side step 11 are misaligned, they cannot fit together. As shown in Figure 6, the alveolar bone portion 20 fits onto the tooth table portion 10 only when the positions of the alveolar bone side step 21 and the tooth table side step 11 are aligned, which enables the alveolar bone portion 20 to be positioned on the tooth table portion 10 and stable attachment.

[0048] The length of the root portion 42 of the tooth model 40 corresponds to the length of the root portion 42 of an actual tooth, the depth of the insertion holes 23 in the alveolar bone corresponds to the length of the root portion 42 into which each is inserted, and the alveolar bone side step is provided to correspond to the depth of the insertion holes 23. Therefore, the alveolar bone side step can be provided efficiently while maintaining the shape of the actual tooth.

[0049] The tooth model 40 has a crown 41 and a root 42 that are different colors. Therefore, when reproducing a situation in which the gums 30 or alveolar bone 20 recede due to gingivitis or alveolar pyorrhea, exposing the root 42, the root 42 can be clearly distinguished from the crown 41. This makes dental training easier. [Explanation of symbols]

[0050] 1 Dental model 1D lower dental model 1U Upper dental model 10 Tooth base 11. Tooth base side step 15 Detachable surface on tooth base side 20 Alveolar bone 21 Lateral step of alveolar bone 23 Insertion hole 23A Branch insertion hole 23B Non-branching insertion hole 25 Removal surface on the cistern bone side 30 Gingiva 33 Insertion hole 40 tooth model 40A Furcation tooth model 41 Crown part 42 Root 42a Branch root

Claims

1. a dental abutment; an alveolar bone portion detachably attached to the dental base portion and having a plurality of insertion holes; a gum portion that is detachable from the alveolar bone portion and has a plurality of insertion holes formed at positions that overlap with openings of the insertion holes when the gum portion is attached to the alveolar bone portion; a plurality of model teeth that are detachably attached to the insertion holes through the insertion holes when the gingiva portion is attached to the alveolar bone portion, and that have crown portions exposed from the insertion holes and root portions inserted into the insertion holes when the tooth is inserted into the insertion holes; The plurality of insertion holes include a branch insertion hole whose interior is branched into a plurality of branch holes, the tooth model includes a branched tooth model in which the tooth root portion is branched into a plurality of branch root portions to be inserted into the respective branch holes; an alveolar bone side step portion is provided on an alveolar bone side attachment / detachment surface of the alveolar bone portion that is attached to and detached from the tooth base portion; a tooth-base-side step portion into which the alveolar-bone-side step portion is fitted is provided on a tooth-base-side attachment / detachment surface of the tooth-base portion to which the alveolar-bone portion is attached / detached; the length of the root of the tooth model corresponds to the length of the root of an actual tooth; the depth of the insertion holes in the alveolar bone portion corresponds to the length of the tooth root portion into which each is inserted; The alveolar bone side step portion is provided corresponding to the depth of the insertion hole. Dental model.

2. At least one of the branch holes in one of the insertion holes is a through hole, At least one of the branch root portions of the tooth model to be inserted into the through hole is provided with a screw hole extending from a tip thereof toward the crown portion thereof, a screw insertion hole is provided in the tooth base portion at a position corresponding to the through hole; A screw can be screwed into the screw hole from the back surface of the tooth base portion through the screw insertion hole. The dental model according to claim 1.

3. The branch root portion of one of the model teeth in which the screw hole is provided is The thickest branch root portion among the branch root portions of the tooth model. The dental model according to claim 2.

4. The tooth model has a crown portion and a root portion each having a different color. The dental model according to any one of claims 1 to 3.

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