Dental models and articulators

Abstract

Provided are a dental model and an articulator having a model tooth having a root portion identical to an actual tooth and capable of being attached and detached from a gum portion. The dental model (1) of the present invention comprises: a gum portion (12) provided with an insertion hole (20) for inserting a model tooth (50); and a cover portion (18) provided inside the insertion hole (20) in the gum portion (12). In a closed state, the cover portion constitutes a portion of the gum portion (12). In an open state, the cover portion forms a recess (18b) that is continuous with the insertion hole (20) and exposes at least a portion of the root portion of the model tooth (50). The cover portion opens and closes relative to the other portions of the gum portion (12).

Description

Technical Field

[0001] The invention relates to a dental model and an articulator. Background Art

[0002] Dental models are used in various training and experimental settings at dental educational institutions (dental universities, hygienist schools, dental technician schools), dental hospitals, and dental seminars. Conventionally, such dental models include a model base with insertion holes for individually attaching and detaching multiple model teeth. The model teeth are inserted into the insertion holes, and the model base is secured to the model teeth with screws from the back of the base (see Patent Document 1).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2007-328083 Summary of the Invention

[0006] However, in the case of posterior teeth, for example, the root of a natural posterior tooth is wider than the crown. In conventional dental models, in order to allow the model tooth to fit into the insertion hole, even for posterior teeth, the root is formed smaller than the insertion hole, resulting in a shape different from that of a natural tooth.

[0007] During the process of becoming a dentist, there is also the issue of extracting the dental nerve. In such cases, a dental model for training or experimentation is desired that has the same shape of the tooth root where the nerve passes as the actual tooth root and can be attached and detached from the gum.

[0008] An object of the present invention is to provide a dental model and an articulator having a model tooth having a root portion identical to that of an actual tooth, which can be attached to and detached from the gum portion.

[0009] A model tooth according to one embodiment of the present invention comprises: a gum portion having an insertion hole for inserting the model tooth; and a cover portion, which is provided on the oral inside or outside of the insertion hole in the gum portion, and constitutes a part of the gum portion in a closed state, and forms a recessed portion continuous from the insertion hole and exposing at least a part of the root portion of the model tooth in an open state, and the cover portion opens and closes relative to other parts of the gum portion.

[0010] Preferably, the cover portion is provided on the inner side of the mouth of the gum portion.

[0011] It is preferable that the cover portion is provided on the inside or outside of the mouth of the insertion hole of the model tooth serving as the posterior tooth.

[0012] Alternatively, one of a protrusion and a recess may be provided on the inner peripheral surface of the insertion hole, and the other of the protrusion and the recess may be provided on the outer peripheral surface of the tooth root portion to engage with the one of the protrusion and the recess.

[0013] The cover portion may be fixed to the gum portion by a screw, thereby maintaining a closed state.

[0014] Alternatively, the dental model can be divided into multiple parts.

[0015] Alternatively, the dental model can be divided into at least a first part and a second part, a groove is formed on the surface of the first part opposite to the second part, and a protrusion capable of sliding in the groove is formed on the surface of the second part opposite to the first part.

[0016] The dental model may be divisible into at least a first portion and a second portion, and the second portion may be held by a magnetic force on the first portion.

[0017] In addition, another aspect of the present invention provides an articulator including the above-mentioned dental model and a model support portion that supports the above-mentioned dental model.

[0018] Effects of the Invention

[0019] According to the present invention, it is possible to provide a dental model and an articulator in which a model tooth having a root portion identical to that of an actual tooth is attachable to and detachable from a gum portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a perspective view of an articulator 100 including a dental model 1.

[0021] Figure 2 11A and the upper dental model 1A in a state of being detached from the upper model fixing part 111A.

[0022] Figure 3 It shows the state after the dental model 1 is divided.

[0023] Figure 4 It is a perspective view of the left posterior tooth portion 1b, showing a state in which the posterior tooth cover 13b is opened.

[0024] Figure 5 It is a perspective view of the left posterior tooth portion 1b, showing a state in which the posterior tooth cover 13b is opened and the posterior model tooth 50b is removed.

[0025] Figure 6 It is a perspective view of the left posterior tooth portion 1b, showing a state in which the posterior tooth cover 13b is opened and the posterior model tooth 50b and the posterior tooth cover 13b are removed.

[0026] Figure 7 It is a plan view of the front teeth portion 1f, showing a state in which the front teeth cover 13f is opened.

[0027] Figure 8 It is a plan view of the front teeth portion 1f, showing a state in which the front teeth cover 13f is open and the front model teeth 50f are moved inward.

[0028] Figure 9 It is a plan view of the front teeth portion 1f, showing a state in which the front teeth cover 13f is opened and the front model teeth 50f are removed.

[0029] Figure 10 It is a side view of the front model tooth 50f. DETAILED DESCRIPTION

[0030] (Articulator 100)

[0031] Refer to the attached Figure 1 A dental model 1 according to an embodiment of the present invention will be described. Figure 1 This is a perspective view of an articulator 100 including a dental model 1. The articulator 100 includes a dental model 1 and a model support 101. The dental model 1 includes an upper dental model 1A and a lower dental model 1B.

[0032] Hereinafter, as shown in the figure, the lingual side of the dental model 1, where the tongue resides, when placed in a real mouth, is defined as the inside of the mouth, while the cheek and labial sides, which are opposite to it, are defined as the outside of the mouth. Furthermore, as shown in the figure, the posterior tooth side and the anterior tooth side are defined. Furthermore, the upper tooth side of the dental model 1 when placed in a real mouth is defined as "up," and the lower tooth side is defined as "down."

[0033] (Model Supporting Unit 101)

[0034] The model support part 101 includes an upper model support part 101A that supports the upper dental model 1A, and a lower model support part 101B that supports the lower dental model 1B.

[0035] (Upper mold support portion 101A)

[0036] The upper mold supporting portion 101A includes an upper mold fixing portion 111A, an upper holding portion 112A that holds the rear of the upper mold fixing portion 111A, and a pair of upper rear extending portions 113A that extend obliquely downward and rearward from the upper holding portion 112A.

[0037] Figure 2 11A and the upper dental model 1A in a state of being detached from the upper model fixing part 111A.

[0038] The upper model fixing portion 111A is made of a magnetic material and has a housing 114A on its lower surface, shaped to correspond to the upper surface of the upper dental model 1A. Furthermore, a magnet is embedded in the upper dental model 1A. The upper dental model 1A is embedded in the housing 114A of the upper model fixing portion 111A and is removably held in place by magnetic force.

[0039] Return to Figure 1 The upper holding portion 112A detachably holds the rear of the upper mold fixing portion 111A. A pair of upper rear extension portions 113A extend obliquely downwardly and rearwardly from one end and the other end in the longitudinal direction of the rear surface of the upper holding portion 112A.

[0040] (Lower mold support portion 101B)

[0041] The lower mold supporting portion 101B includes a lower mold fixing portion 111B, a lower holding portion 112B that detachably holds the rear portion of the lower mold fixing portion 111B, and a pair of lower rear extending portions 113B that extend obliquely upward and rearward from the lower holding portion 112B.

[0042] Similar to the upper model fixing portion 111A, the lower model fixing portion 111B is made of a magnetic material and has a housing 114B on its upper surface that corresponds to the shape of the lower surface of the lower dental model 1B. Similarly to the upper dental model 1A, a magnet is embedded in the lower dental model 1B. The lower dental model 1B is embedded in the housing 114B of the lower model fixing portion 111B and is removably held there by magnetic force.

[0043] The lower holding portion 112B detachably holds the rear of the lower mold fixing portion 111B. A pair of lower rear extension portions 123 extend obliquely upward and rearward from one end and the other end in the longitudinal direction of the rear surface of the lower holding portion 112B.

[0044] Furthermore, the lower end of the upper rear extension portion 113A and the upper end of the lower rear extension portion 113B are rotatably connected.

[0045] (Dental Model 1)

[0046] Next, the dental model 1 according to the embodiment will be described.

[0047] The upper dental model 1A is formed of a hard synthetic resin material. The dental model 1 includes a model tooth base 10 and a plurality of model teeth 50 .

[0048] The model dental base 10 includes a base portion 11 having a flat surface 14 that contacts the bottom surface of the storage portion 114 of the model support portion 101 , and a gum portion 12 that is integral with the base portion 11 and protrudes from the base portion 11 .

[0049] The model teeth 50 are respectively inserted into the insertion holes 20 provided at the top of the protruding portion of the gum part 12 .

[0050] In addition, regarding the lower dental model 1B, since these structures are the same, the description is omitted.

[0051] The upper dental model 1A can be divided into a plurality of parts. Figure 3 The upper dental model 1A is shown after being divided. In the embodiment, the upper dental model 1A can be divided into three divided dental models: the right posterior part (first part) 1r, the anterior part 1f (second part) connected to the right posterior part 1r, and the left posterior part 1b connected to the anterior part 1f.

[0052] A groove 15a extending up and down is formed on the side surface of the right posterior tooth portion 1r on the side of the anterior tooth portion 1f. A protrusion 16a extending up and down and capable of sliding within the groove 15a is formed on the right posterior tooth portion 1r side of the anterior tooth portion 1f. The right posterior tooth portion 1r and the anterior tooth portion 1f are assembled and disassembled by sliding the protrusion 16a of the anterior tooth portion 1f within the groove 15a of the right posterior tooth portion 1r. In addition, magnets are embedded in relative positions on the right posterior tooth portion 1r and the anterior tooth portion 1f when the right posterior tooth portion 1r and the anterior tooth portion 1f are combined. Therefore, the state of the right posterior tooth portion 1r and the anterior tooth portion 1f being combined is maintained by magnetic force.

[0053] On the left back tooth portion 1b side of the front tooth portion 1f, a protrusion 16b extending vertically is formed. On the front tooth portion 1f side of the left back tooth portion 1b, a groove 15b extending vertically is formed. By sliding the protrusion 16b of the front tooth portion 1f in the groove 15b of the left back tooth portion 1b, the left back tooth portion 1b and the front tooth portion 1f are assembled and disassembled. In addition, magnets are embedded in the front tooth portion 1f and the left back tooth portion 1b at relative positions when the front tooth portion 1f and the left back tooth portion 1b are combined. Therefore, the state of the front tooth portion 1f and the left back tooth portion 1b being combined is maintained by magnetic force.

[0054] A plurality of insertion holes 20 are provided at the top of the protruding portion of the gum portion 12. The model teeth 50 are inserted into the gum portion 12 through the insertion holes 20, respectively.

[0055] (Posterior Teeth Cover 13b)

[0056] A recess 18b is formed inside the mouth of the rear insertion hole 20b in which the detachable rear model tooth 50b is mounted. The recess 18b is connected to the rear insertion hole 20b and the rear teeth cap 13b is mounted on the recess 18b.

[0057] Figure 4 It is a perspective view of the left posterior tooth portion 1b, showing a state in which the posterior tooth cover 13b is opened. Figure 5It is a perspective view of the left posterior tooth portion 1b, showing a state in which the posterior tooth cover 13b is opened and the posterior model tooth 50b is removed. Figure 6 It is a perspective view of the left posterior tooth portion 1b, showing a state in which the posterior tooth cover 13b is opened and the posterior model tooth 50b and the posterior tooth cover 13b are removed.

[0058] The posterior tooth cover 13b is made of the same material as the gum portion 12. When closed, the posterior tooth cover 13b forms a portion of the gum portion 12 and includes a surface 131b that is integral with the surface of the gum portion 12 and an inner surface 132b opposite thereto. The inner surface 132b includes a portion of the inner circumference that defines one of the root insertion holes 241 in the tooth root insertion holes 24 into which the tooth root portion 52b, described later, is inserted.

[0059] exist Figure 3 In the closed state shown, the surface 131b of the posterior tooth cover 13b constitutes a part of the gum portion 12, simulating the shape of the gum portion in the actual mouth, and the upper edge of the posterior tooth cover 13b constitutes a part of the edge of the opening of the rear insertion hole 20b.

[0060] like Figure 6 As shown, the base end of the posterior teeth cover 13b is provided with a shaft 17 extending in the direction of tooth arrangement. On the other hand, a groove 19 for inserting the shaft 17 is provided on the inner side of the recess 18b of the gum portion 12.

[0061] The groove 19 extends from the tooth tip side of the model tooth 50 toward the flat surface 14 in the vertical direction, but does not penetrate the flat surface 14 and has a bottom 191. Figure 6 A protrusion 192 is provided on the tooth tip side (which becomes the upper tooth tip side).

[0062] The shaft 17 is inserted into the groove 19 from the tooth tip side, and when it slides toward the flat surface 14 side and passes over the protrusion 192, it is held in the space between the protrusion 192 and the bottom 191 in the groove 19. Once the shaft 17 is held in this space, it is rotatably held in the space as long as no force is applied that is sufficient to pass over the protrusion 192. The shaft 17 rotates in this space, and the posterior tooth cover 13b can be moved around the shaft 17. Figure 3 The closed state and Figure 4 and Figure 5 The display switches between the open and closed states.

[0063] In addition, on the posterior teeth cover 13b, a horizontal screw insertion hole 25b is provided that penetrates from the surface 131b side to the inner surface 132b side. On the other hand, on the inner surface of the recess 18b of the gum portion 12 toward the inside of the mouth, a threaded hole 26b is provided along the horizontal direction.

[0064] (Back model tooth 50b)

[0065] like Figure 5 As shown, the posterior model tooth 50b includes a crown portion 51b and a root portion 52b.

[0066] The tooth crown portion 51 b is a portion exposed from the rear insertion hole 20 b of the gum portion 12 in a state where the rear model tooth 50 b is fixed to the gum portion 12 .

[0067] The tooth root portion 52 b is a portion that is inserted into the rear insertion hole 20 b in a state where the rear model tooth 50 b is fixed to the gum portion 12 and is covered by the gum portion 12 including the cover portion 13 .

[0068] The root portion 52b of the posterior model tooth 50b includes three root portions 52b: an inward root portion 521, an outward root portion 522, and a root portion 523. The inward root portion 521 extends outward relative to the crown portion 51b. This outward extension means that when the model tooth 50 is viewed from the crown portion 51, the root portion 52 is visible protruding outward from the crown portion 51.

[0069] (recessed portion 18b)

[0070] Inside the rear insertion hole 20 b provided in the gum portion 12 , a tooth root insertion hole 242 and a tooth root insertion hole 243 are provided, into which the tooth root portions 522 and 523 on the outside of the mouth are inserted.

[0071] In addition, a portion of the inner circumferential surface is provided to form a tooth root insertion hole 241 for inserting the tooth root portion 521 on the inner side of the mouth. When the posterior tooth cover 13b is closed, the tooth root insertion hole 241 is formed by the portion of the inner circumferential surface of the posterior tooth cover 13b forming the tooth root insertion hole 241 and the portion of the inner circumferential surface of the recess 18b forming the tooth root insertion hole 241.

[0072] In addition, the edge of the opening of the rear insertion hole 20b is defined by the upper edge of the rear insertion hole 20b and the upper edge of the posterior teeth cover 13b.

[0073] Here, the opening of the rear insertion hole 20b in this embodiment is roughly the same shape as in an actual mouth, corresponding to the outer periphery of the boundary between the crown portion 51b and the root portion 52b, which is the base of the crown portion 51b. Therefore, the rear model tooth 50b, which has a root portion 521 that is wider than the crown portion 51b, cannot be attached or detached from the gum portion 12 through the rear insertion hole 20b when the rear tooth cover 13b is closed.

[0074] However, in the embodiment, as Figure 5 By opening the posterior teeth cover 13b in this manner, the recessed portion 18b continuous with the posterior insertion hole 20b is exposed.

[0075] Then, the root portion 522 and the root portion 523 of the rear model tooth 50b are respectively inserted into the root insertion hole 242 and the root insertion hole 243 provided inside the rear insertion hole 20b. One side of the outer peripheral surface of the root portion 521 abuts against the inner peripheral surface of a portion of the root insertion hole 241 provided in the recess 18b. Figure 4 The state shown.

[0076] If from Figure 4 When the rear model tooth 50b is closed in the state of , the other outer peripheral surface of the root portion 52b of the rear model tooth 50b abuts against the inner surface of the other portion constituting the root insertion hole 241 provided on the inner surface 132b of the rear teeth cap 13b.

[0077] With the posterior teeth cover 13b closed, the screw 27b is inserted laterally through the screw insertion hole 25b and screwed into the threaded hole 26b of the gum portion 12. As a result, the root portion 521 of the posterior model tooth 50b is pressed by the posterior teeth cover 13b, and the posterior model tooth 50b is fixed to the gum portion 12.

[0078] To remove the posterior model tooth 50b from the gum portion 12, the screw 27b is rotated in the reverse direction of the above-described installation procedure to remove the screw 27b from the threaded hole 26b and the screw insertion hole 25b. Furthermore, by opening the posterior tooth cover 13b, the posterior model tooth 50b, which has a root portion 521 that is wider than the crown portion 51b, can be removed from the gum portion 12.

[0079] (Front teeth cover 13f)

[0080] In the embodiment, the insertion hole 20 is also formed with a recess 18f on the oral side of the front insertion hole 20f in the gum portion 12 where the detachable front model tooth 50f is mounted. The front teeth cap 13f is mounted in the recess 18f.

[0081] Figure 7 It is a plan view of the front teeth portion 1f, showing a state in which the front teeth cover 13f is opened. Figure 8 It is a plan view of the front teeth portion 1f, showing a state in which the front teeth cover 13f is open and the front model teeth 50f are moved inward. Figure 9 It is a plan view of the front teeth portion 1f, showing a state in which the front teeth cover 13f is opened and the front model teeth 50f are removed. Figure 10 It is a side view of the front model tooth 50f.

[0082] The front teeth cover 13f is made of the same material as the gum portion 12. When closed, the front teeth cover 13f forms a portion of the gum portion 12 and includes a surface 131f integral with the surface of the gum portion 12 and an inner surface 132f opposite thereto. The inner surface 132f includes a portion of the inner circumference of a tooth root insertion hole 242 into which the tooth root portion 52f, described later, is inserted.

[0083] exist Figure 3 In the closed state shown, the surface 131f of the front teeth cover 13f constitutes a part of the gum part 12, simulating the shape of the gum part in the actual mouth, and the upper end of the front teeth cover 13f forms a part of the edge of the opening of the front insertion hole 20f.

[0084] Since the attachment structure of the front teeth cover 13 f to the gum portion 12 is the same as the attachment structure of the back teeth cover 13 b to the gum portion 12 , description thereof will be omitted.

[0085] The front teeth cover 13f is provided with a screw insertion hole 25f extending vertically when closed. Meanwhile, a screw hole 26f extending vertically is provided on the inner surface of the recess 18f of the gum portion 12.

[0086] Furthermore, in the closed state, a recess 28in is provided on the inner surface of the front teeth cover 13f facing the outside of the mouth.

[0087] (Front model tooth 50f)

[0088] like Figure 10 As shown, the front model tooth 50f includes a crown portion 51f and a root portion 52f. Unlike the back model tooth 50b, the root portion 52f of the front model tooth 50f does not extend wider than the crown portion 51f. Furthermore, protrusions 53in and 53ou are provided on the outer circumference of the root portion 521 on the oral inner and outer sides, respectively.

[0089] (recessed portion 18f)

[0090] A tooth root insertion hole 24f into which the tooth root portion 52f is inserted is provided inside the recess 18f provided in the gum portion 12. A recess 28ou is provided on the inner peripheral surface of the tooth root insertion hole 24f in a portion facing the inside of the mouth.

[0091] Furthermore, the inner side of the tooth root insertion hole 24f does not cover a portion of the tooth root portion 52f on the crown portion 51f side. Therefore, when the tooth root portion 52f is inserted into the tooth root insertion hole 24f and the front tooth cover 13f is opened, a portion of the tooth root portion 52f on the crown portion 51f side is exposed. When the front tooth cover 13f is closed, the inner surface of the front tooth cover 13f covers this portion.

[0092] Furthermore, the opening of the front insertion hole 20f is defined by the edge of the tooth root insertion hole 24f and the edge of the front teeth cap 13f.

[0093] like Figure 9 In this manner, with the front teeth cover 13f open, the front model tooth 50f is inserted into the opened tooth root insertion hole 24f.

[0094] At this time, first Figure 8 As shown, the front model tooth 50f is inserted in a state where the tooth tip is inclined toward the inner side of the mouth. After the front model tooth 50f is inserted deeply, the front model tooth 50f is laid out toward the outer side of the mouth.

[0095] Then, the convex portion 53ou provided on the outer peripheral surface of the tooth root portion 52f is embedded in the concave portion 28ou of the inner peripheral surface of the tooth root insertion hole 24f provided in the gum portion 12, which is located toward the middle side of the mouth. Figure 7 The state shown.

[0096] from Figure 7 Then, the convex portion 53in provided on the oral inner side of the outer peripheral surface of the tooth root portion 52f is fitted into the concave portion 28in provided on the inner surface of the front teeth cap 13f facing the oral outer side.

[0097] Next, with the front teeth cover 13f closed, the screw 27f is inserted upward from the screw insertion hole 25f and screwed into the threaded hole 26f of the gum portion 12. Thus, the front teeth cover 13f is fixed to the gum portion 12.

[0098] Here, the opening of the front insertion hole 20f in the embodiment has substantially the same shape as the outer periphery of the boundary portion between the crown portion 51f and the root portion 52f, which is the root portion of the crown portion 51f, as in an actual mouth.

[0099] Therefore, without taking any countermeasures, the front model tooth 50 f having the root portion 52 f thinner than the crown portion 51 f can be pulled out from the insertion hole 20 even in a state where the front teeth cap 13 f is closed.

[0100] However, in the embodiment, the front model tooth 50f can be prevented from falling out of the insertion hole 20 by fitting the protrusion 53ou provided on the root portion 52f and the recess 28ou provided on the inner peripheral surface of the root insertion hole 24f, and by fitting the protrusion 53in provided on the root portion 52f and the recess 28in provided on the front tooth cover portion 13f.

[0101] To remove the tooth cap, screw 27f is rotated in the opposite direction to the installation described above, and screw 27f is removed from threaded hole 26 and screw insertion hole 25. Then, the front teeth cover 13f is opened. This causes the recess 28in on the inner surface of the front teeth cover 13f, which faces the outside of the mouth, to separate from the protrusion 53in on the outer peripheral surface of the tooth root portion 52f, which faces the inside of the mouth.

[0102] Then, the front model tooth 50f is laid down toward the inside of the mouth. Then, the convex portion 53ou provided on the outer peripheral surface of the tooth root portion 521 is separated from the concave portion 28ou provided on the inner peripheral surface of the tooth root insertion hole 241 of the gum portion 12 toward the inside of the mouth.

[0103] Thereby, the front model tooth 50 f can be removed from the tooth root insertion hole 241 .

[0104] As described above, according to this embodiment, the following effects are achieved.

[0105] According to the dental model 1 of the embodiment, even if the model tooth 50 is the same as an actual tooth and has a root portion 52 that is extended wider than the crown portion 51, the model tooth 50 can be attached to and detached from the gum portion 12 by opening the cover portion 18 provided on the gum portion 12 to expose at least a portion of the root portion 52.

[0106] At this time, when the lid 18 is closed, the opening of the insertion hole 20 has substantially the same shape as the outer periphery of the boundary between the crown portion 51 b and the root portion 52 , so there is no gap around the boundary.

[0107] Furthermore, by opening the cover portion 18 , at least a portion of the tooth root portion 52 is exposed, and thus the tooth root portion 52 in a state of being attached to the gum portion 12 can be observed.

[0108] Since the model tooth 50 has the same shape as a natural tooth, for example, nerve extraction training using the model tooth 50 can be performed.

[0109] Since the cover portion 18 constitutes a part of the gum portion 12 in the closed state, the actual shape of the gum is not damaged.

[0110] Since the dental model can be divided, for example, only the necessary parts can be submitted during dental education trials, making it easier for the scoring side to observe and reducing the storage space.

[0111] (Deformation method)

[0112] In the above embodiment, a posterior tooth cover 13b is provided on the inner side of the mouth of one posterior model tooth 50b among the model teeth 50 included in the left posterior tooth portion 1b, and the posterior model tooth 50b is detachably attached to the gum portion 12. Furthermore, an anterior tooth cover 13f is provided on the inner side of the mouth of one anterior model tooth 50f among the model teeth 50 included in the anterior tooth portion 1f, and the anterior model tooth 50f is detachably attached to the gum portion 12.

[0113] However, this is not limited to this. The model teeth 50 provided with a cover and capable of being installed and removed are not limited to these teeth, but may also be other teeth. In addition, the number of model teeth 50 that can be installed and removed is not limited to two, but may be more than two or less than two, and all model teeth may also be installable and removeable.

[0114] In the embodiment, an example in which the cover 13 is provided on the upper dental model 1A has been described, but the present invention is not limited thereto, and the cover may be provided on the lower dental model 1B.

[0115] The cover 13 is swingable relative to the gum portion 12 via the shaft 17 , but is not limited thereto. The cover 13 may not be engaged via the shaft 17 , and may be separated when removed, for example.

[0116] In the embodiment, the cover 13 is provided inside the opening of the insertion hole 20. Thus, the cover 13 is not visible when viewed from the outside of the opening, which improves the appearance. However, the present invention is not limited to this, and the cover 13 may also be provided outside the opening of the insertion hole 20.

[0117] In the embodiment, the upper dental model 1A can be divided into three parts, but this is not limited to this. The number of divisions is not limited to three, and the positions of the divisions are not limited to the positions in the embodiment. In addition, the lower dental model 1B can also be divided.

[0118] Description of Reference Numerals

[0119] 1 Dental Model

[0120] 1A Upper dental model

[0121] 1B Lower dental model

[0122] 12 Gum

[0123] 13 cover

[0124] 14 flat surface

[0125] 15 grooves

[0126] 16a protrusion

[0127] 16b protrusion

[0128] 17 Shaft

[0129] 18 cover

[0130] 18b recess

[0131] 18f concave part

[0132] 19 groove

[0133] 20 Insertion hole

[0134] 24 Root insertion hole

[0135] 25 screw insertion holes

[0136] 26 threaded holes

[0137] 27 screws

[0138] 28 Depression

[0139] 50 model teeth

[0140] 51 Crown

[0141] 52 tooth root

[0142] 53 bulge

[0143] 100 Articulator

[0144] 101 Model support part

[0145] 131 Surface

[0146] 132 inner surface

[0147] 191 bottom

[0148] 192 protrusion.

Claims

1. A dental model comprising: a gum portion having an insertion hole for inserting the model tooth; and A cover portion is provided on the oral inner side or oral outer side of the insertion hole in the gum portion, and constitutes a portion of the gum portion in a closed state. In an open state, a recessed portion is formed that is continuous with the insertion hole and exposes at least a portion of the root portion of the model tooth. The cover portion opens and closes relative to the other portions of the gum portion. The cover portion is held relative to the gum portion via a shaft portion so as to be swingable between the closed state and the open state. The edge of the opening of the insertion hole is formed by the upper edge of the gum part and the cover part. When the cover part is closed, both ends of the edge of the opening intersect, thereby forming a recessed part for placing the tooth root part.

2. The dental model according to claim 1, wherein The cover portion is provided on the inner side of the mouth of the gum portion.

3. The dental model according to claim 1 or 2, wherein: The cover portion is provided on the inside or outside of the mouth of the insertion hole of the model tooth serving as the posterior tooth.

4. The dental model according to claim 1 or 2, wherein: On the inner peripheral surface of the insertion hole, one of a protrusion and a recess is provided. The outer peripheral surface of the tooth root portion is provided with the other of the protrusion and the recess that engages with one of the protrusion and the recess.

5. The dental model according to claim 1 or 2, wherein: The cover portion is fixed to the gum portion by a screw, thereby maintaining a closed state.

6. The dental model according to claim 1 or 2, wherein: The dental model can be divided into multiple parts.

7. The dental model according to claim 6, wherein: The dental model can be divided into at least a first part and a second part, A groove is formed on the surface of the first portion opposite to the second portion. A protrusion portion slidable in the groove is formed on a surface of the second portion that faces the first portion.

8. The dental model according to claim 6, wherein: The dental model can be divided into at least a first part and a second part, The second portion is held on the first portion by a magnetic force.

9. An articulator comprising: The dental model according to any one of claims 1 to 5; and A model supporting portion supports the dental model.

Images