阅读说明：本技术 咬合器 (Occlusion device ) 是由 后藤秀明 岩崎晃幸 细谷昌广 国保俊光 松尾晃士朗 松冈侑平 安藤真之介 于 2018-09-27 设计创作，主要内容包括：本发明提供能够安装于支承轴体且上颌支承部与下颌支承部能够相对转动的咬合器。咬合器(1)包括设有向前方凹陷的上侧凹部(15)的上颌支承部(10)和在侧凹部的下侧设有向前方凹陷的下侧凹部(35)的下颌支承部(20),能够将支承轴体(70)安装在上侧/下侧凹部与支承轴体固定部件(80)之间。在上侧凹部的内表面左右形成有上下延伸且上端不贯通而下端贯通的上槽,在下侧凹部的内表面左右形成有上下延伸且上端及下端贯通的下槽,该下槽在下颌支承部与上颌支承部成规定角度的情况下与上槽位于同一直线上,支承轴体固定部件包括主体部(81)和在主体部的左右设置的宽幅部(84)及窄幅部(85),将支承轴体固定部件以宽幅部在上的状态从下槽侧朝向上槽插入,在宽幅部的上端与上槽的上端抵接时,宽幅部与上槽卡合且与下槽不卡合,从而下颌支承部能够在安装于支承轴体的状态下向前方转动。(The invention provides an articulator which can be mounted on a support shaft and in which a maxilla support part and a mandible support part can rotate relative to each other. The articulator (1) comprises a maxilla support part (10) provided with an upper side recess (15) recessed forward and a mandible support part (20) provided with a lower side recess (35) recessed forward on the lower side of the side recess, and a support shaft body (70) can be mounted between the upper/lower side recesses and a support shaft body fixing member (80). An upper groove extending vertically and having a lower end penetrating therethrough is formed on the left and right of the inner surface of the upper concave portion, a lower groove extending vertically and having an upper end and a lower end penetrating therethrough is formed on the left and right of the inner surface of the lower concave portion, the lower groove is positioned on the same straight line as the upper groove when the lower jaw support portion and the upper jaw support portion form a predetermined angle, the support shaft body fixing member includes a main body portion (81), and a wide portion (84) and a narrow portion (85) provided on the left and right of the main body portion, the support shaft body fixing member is inserted from the lower groove side toward the upper groove with the wide portion on the upper side, and when the upper end of the wide portion abuts against the upper end of the upper groove, the wide portion engages with the upper groove and does not engage with the lower groove, so that the lower jaw support portion can rotate forward in a state of being mounted on the support shaft.)

1. An occluder, comprising:

an upper jaw support part which fixes the upper jaw model on the front side and is provided with an upper side concave part which is concave forwards on the rear side;

a lower jaw support portion to which a lower jaw model is fixed on a front side, in which a lower concave portion that is concave forward is provided below the upper concave portion on a rear side, and which is connected to the upper jaw support portion so as to be swingable about an axis extending in the left-right direction; and

a support shaft fixing member that is attachable to and detachable from a rear side of the upper recessed portion and a rear side of the lower recessed portion,

the articulator is attachable to a predetermined position of the support shaft body in a state where the support shaft body is sandwiched between the upper and lower concave portions and the support shaft body fixing member,

the occluder is characterized in that,

upper grooves extending vertically and having upper ends not penetrating and lower ends penetrating are formed in the inner surface of the upper concave portion at the left and right portions facing each other,

lower grooves extending vertically and having upper and lower ends penetrating therethrough are formed in the inner surface of the lower recessed portion at the left and right portions facing each other, and the lower grooves are aligned on the same line as the upper grooves when the lower jaw support portion and the upper jaw support portion form a predetermined angle,

the support shaft body fixing member includes:

a main body portion; and

wide width parts respectively provided on the left and right of the main body part and narrow width parts continuously extending from the wide width parts,

the support shaft body fixing member is inserted from the lower groove side of the mandible support part toward the upper groove of the maxilla support part in a state where the wide width part is up, and when an upper end of the wide width part abuts against an upper end of the upper groove, the wide width part is engaged with the upper groove and is not engaged with the lower groove, so that the mandible support part can be rotated forward in a state where the mandible support part is attached to the support shaft body.

2. The occluder of claim 1,

the support shaft fixing member is inserted from the lower groove side of the mandible support toward the upper groove of the maxilla support with the narrow width portion up, and when the upper end of the narrow width portion abuts against the upper end of the upper groove, the wide width portion engages with the upper groove and the lower groove, and the mandible support cannot rotate forward with being attached to the support shaft.

3. The occluder of claim 1 or 2,

the inner surface of the lower groove comprises a front surface, a rear surface and a side surface,

when the upper groove and the lower groove are substantially aligned on a straight line, the length of the gap between the upper groove and the lower groove is TL, the length of the upper groove is UL, the length of the lower groove is DL, the length of the wide portion is LL, and the length of the narrow portion is SL, the gap satisfies the following conditions

LL < UL + TL < SL + LL and SL < UL + TL + DL

In the context of (a) or (b),

when the distance between the outer edges of the left and right narrow width portions is SW, the distance between the inner edges of the rear surfaces of the left and right lower grooves is DWI, the distance between the outer edges of the left and right wide width portions is LW, and the distance between the side surfaces of the left and right lower grooves is DWO, the requirements are satisfied

SW＜DWI＜LW＜DWO

In the context of (a) or (b),

when the distance between the inner edges of the rear surfaces of the upper grooves arranged on the left and right sides is UWI and the distance between the side surfaces of the upper grooves arranged on the left and right sides is UWO, the requirements are satisfied

UWI＜SW＜LW＜UWO

The relationship (2) of (c).

4. The occluder according to any one of claims 1 to 3,

the maxilla support portion includes:

an upper jaw fixing part fixed to the upper jaw model;

a pair of upper jaw rear extension parts extending rearward from both left and right ends of the upper jaw fixing part;

an upper connecting portion connecting rear ends of the pair of maxillary posterior extending portions; and

condylar protrusions provided at the left and right ends of the upper coupling portion, respectively,

the mandible support comprises:

a lower jaw fixing part fixed to the lower jaw model;

a pair of lower jaw rear extension portions extending rearward from the lower jaw fixing portion;

a lower connecting portion connecting rear ends of the pair of lower jaw rear extension portions; and

condylar portions provided at both left and right ends of the lower linking portion, respectively, and supporting the condylar portions so as to be rotatable about the axis,

the upper concave portion is provided at the upper coupling portion,

the lower concave portion is provided at the lower coupling portion.

5. The occluder of claim 4,

the upper jaw supporting part is provided with a 1 st clamping part and a 2 nd clamping part which protrude to the radial outside of the axial line,

the mandible supporting part is provided with a clamping and receiving part which is arranged on the mandible rear extension part and is used for clamping and receiving the mandible

In the 1 st state that the angle between the upper jaw supporting part and the lower jaw supporting part is the 1 st angle, the front part of the 1 st clamping part and the 2 nd clamping part is positioned,

the upper jaw support portion and the lower jaw support portion are positioned between the 1 st engaging portion and the 2 nd engaging portion in a 2 nd state where an angle between the upper jaw support portion and the lower jaw support portion is a 2 nd angle larger than the 1 st angle,

and a 3 rd state in which an angle between the upper jaw support portion and the lower jaw support portion is a 3 rd angle larger than the 2 nd angle, the 1 st engaging portion and the 2 nd engaging portion being located rearward.

6. The occluder of claim 5, comprising:

a stopper portion provided on the maxilla support portion and having a downward surface; and

and a stopper receiving portion provided in the lower jaw support portion and having an upward surface abutting against the downward surface in the 1 st state.

7. The occluder of claim 5 or 6,

the condylar portion has an upper wall portion and a lower wall portion extending from a rear side to a rear side of the mandibular rearward extension portion, and has a U-shaped cross section,

the condylar portion is rotatably held on an anterior side between the superior wall and the inferior wall of the condylar portion,

the distance between the upper wall portion and the lower wall portion becomes narrower as it goes from the front side to the rear side,

the condylar protrusion elastically deforms the upper wall portion and the lower wall portion to move from the anterior side to the posterior side between the upper wall portion and the lower wall portion when the 1 st engaging portion or the 2 nd engaging portion passes over the engagement receiving portion.

8. The occluder of any one of claims 5 to 7,

a radial distance from the axis of a tip of the 2 nd engaging portion is greater than a radial distance from the axis of a tip of the 1 st engaging portion.

9. The occluder of any one of claims 4 to 8,

the condylar protrusion protrudes in a left-right direction from a posterior side of the posterior maxillary extension.

10. The occluder of any one of claims 4 to 9,

a 1 st model mounting hole for inserting a bolt into a bolt hole provided in the upper jaw model in the upper jaw fixing part, or

At least one of the model 2 mounting holes in the lower jaw fixing section for inserting a bolt into a bolt hole provided in the lower jaw model is U-shaped.

11. The occluder of any one of claims 1 to 10,

the upper jaw support portion and the lower jaw support portion are respectively integrally molded resin members.

Technical Field

The present invention relates to an occluder.

Background

Conventionally, in the dental field, when a denture, a dental restoration, or the like is produced, an articulator that reproduces the jaw movement of a human body has been used. The articulator includes an upper jaw support part for defining an upper jaw model, a lower jaw support part for fixing a lower jaw model, and a joint part for rotatably connecting the upper jaw support part and the lower jaw support part. In such an articulator, there is a case where a holding mechanism for a support shaft body is provided (see patent document 1). The conventional articulator is fixed to the support shaft body by passing the support shaft body through a through hole provided in the rear portion of the articulator and fixing the support shaft body with screws.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 2012-192166

Disclosure of Invention

Problems to be solved by the invention

The support shaft body may be provided upright on the fixed base at a lower end thereof and may have a head attached to an upper end thereof. In this case, if the one end of the support shaft body is not attached by detaching the support shaft body from the fixed base or removing the head, the conventional articulator cannot be attached to or detached from the support shaft body. Therefore, the articulator is not easily attached to or detached from the support shaft body.

The invention aims to provide an articulator which can be assembled and disassembled with respect to a supporting shaft body at a part except for the end part of the supporting shaft body.

Means for solving the problems

In order to achieve the above object, the present invention provides an occluder comprising: an upper jaw support part which fixes the upper jaw model on the front side and is provided with an upper side concave part which is concave forwards on the rear side; a lower jaw support portion to which a lower jaw model is fixed on a front side, in which a lower concave portion that is concave forward is provided below the upper concave portion on a rear side, and which is connected to the upper jaw support portion so as to be swingable about an axis extending in the left-right direction; and a support shaft fixing member that is attachable to and detachable from rear sides of the upper recessed portion and the lower recessed portion, wherein the articulator is attachable to a predetermined position of the support shaft in a state where the support shaft is sandwiched between the upper recessed portion and the lower recessed portion and the support shaft fixing member, wherein upper grooves extending in a vertical direction and having upper ends thereof not penetrating therethrough and lower ends thereof penetrating therethrough are formed in respective opposite left and right portions of an inner surface of the upper recessed portion, and lower grooves extending in a vertical direction and having upper ends and lower ends thereof penetrating therethrough are formed in respective opposite left and right portions of an inner surface of the lower recessed portion, the lower grooves being aligned in the same line with the upper grooves when the lower jaw support portion and the upper jaw support portion form a predetermined angle, the support shaft fixing member comprising: a main body portion; and wide width portions and narrow width portions, which are respectively provided on the left and right sides of the body portion and extend continuously from the wide width portions, wherein the support shaft fixing member is inserted from the lower groove side of the mandible support portion toward the upper groove of the maxilla support portion in a state in which the wide width portions are up, and when an upper end of the wide width portion abuts against an upper end of the upper groove, the wide width portions engage with the upper groove and do not engage with the lower groove, so that the mandible support portion can be rotated forward in a state in which the mandible support portion is attached to the support shaft.

Preferably, the support shaft fixing member is inserted from the lower groove side of the mandible support section toward the upper groove of the maxilla support section with the narrow width section up, and when an upper end of the narrow width section abuts against an upper end of the upper groove, the wide width section engages with the upper groove and the lower groove, and the mandible support section is prevented from rotating forward in a state of being attached to the support shaft.

Preferably, the inner surface of the lower tank includes a front surface, a rear surface, and side surfaces, and when the upper tank and the lower tank are substantially aligned on a straight line, a gap between the upper tank and the lower tank is TL, the upper tank is UL, the lower tank is DL, the wide-width portion is LL, and the narrow-width portion is SL, relationships of LL < UL + TL < SL + LL and SL < UL + TL + DL are satisfied, when an outer edge distance of the narrow-width portion provided on the left and right is SW, an inner edge distance of the rear surface of the lower tank provided on the left and right is DWI, an outer edge distance of the wide-width portion provided on the left and right is LW, and a distance between the side surfaces of the lower tank provided on the left and right is DWO, a relationship of SW < DWI < LW is satisfied, and when an inner edge distance of the upper tank provided on the left and right is UWI, When the distance between the side surfaces of the upper groove arranged on the left and the right is set as UWO, the relation of UWI < SW < LW < UWO is satisfied.

Preferably, the maxilla support portion includes: an upper jaw fixing part fixed to the upper jaw model; a pair of upper jaw rear extension parts extending rearward from both left and right ends of the upper jaw fixing part; an upper connecting portion connecting rear ends of the pair of maxillary posterior extending portions; and condylar protrusions provided at both left and right ends of the upper connecting portion, respectively, the mandible support portion including: a lower jaw fixing part fixed to the lower jaw model; a pair of lower jaw rear extension portions extending rearward from the lower jaw fixing portion; a lower connecting portion connecting rear ends of the pair of lower jaw rear extension portions; and condylar portions provided at both left and right ends of the lower linking portion, respectively, and supporting the condylar portions so as to be rotatable about the axis, wherein the upper concave portion is provided in the upper linking portion, and the lower concave portion is provided in the lower linking portion.

Preferably, the upper jaw support portion includes a 1 st engaging portion and a 2 nd engaging portion which protrude outward in a radial direction of the axis line, the lower jaw support portion includes an engaging receiving portion which is provided in the lower jaw rear extension portion, and is positioned forward of the 1 st engaging portion and the 2 nd engaging portion in a 1 st state in which an angle between the upper jaw support portion and the lower jaw support portion is a 1 st angle, positioned between the 1 st engaging portion and the 2 nd engaging portion in a 2 nd state in which an angle between the upper jaw support portion and the lower jaw support portion is a 2 nd angle larger than the 1 st angle, and positioned rearward of the 1 st engaging portion and the 2 nd engaging portion in a 3 rd state in which an angle between the upper jaw support portion and the lower jaw support portion is a 3 rd angle larger than the 2 nd angle.

Preferably, the method comprises the following steps: a stopper portion provided on the maxilla support portion and having a downward surface; and a stopper receiving portion provided in the mandible supporting portion and having an upward surface abutting against the downward surface in the 1 st state.

Preferably, the condylar portion has a U-shaped cross section and includes an upper wall portion and a lower wall portion extending from a posterior side to a posterior side of the mandibular posterior extension portion, the condylar portion is rotatably held on an anterior side between the upper wall portion and the lower wall portion of the condylar portion, a distance between the upper wall portion and the lower wall portion decreases from the anterior side to the posterior side, and the condylar portion elastically deforms the upper wall portion and the lower wall portion to move from the anterior side to the posterior side between the upper wall portion and the lower wall portion when the 1 st engaging portion or the 2 nd engaging portion passes over the engagement receiving portion.

Preferably, a radial distance from the axis of a tip of the 2 nd engaging portion is larger than a radial distance from the axis of a tip of the 1 st engaging portion.

Preferably, the condylar portion projects in the left-right direction from a posterior side of the posterior maxillary extension.

Preferably, at least one of a 1 st model mounting hole in the upper jaw fixing portion for inserting a bolt into a bolt hole provided in the upper jaw model and a 2 nd model mounting hole in the lower jaw fixing portion for inserting a bolt into a bolt hole provided in the lower jaw model is U-shaped.

Preferably, the upper jaw support portion and the lower jaw support portion are each an integrally molded resin member.

Effects of the invention

The invention provides an articulator which can be attached to and detached from a support shaft body at a position other than an end portion of the support shaft body.

Drawings

Fig. 1 is a perspective view showing an occluder in an embodiment of the present invention.

Fig. 2 is an exploded perspective view of the occluder.

Figure 3 is a rear view of the occluder.

Fig. 4 is a side view of the articulator, showing a state in which the maxillary support and the mandibular support are closed, (a) being an overall view, and (B) being an enlarged view of the joint.

Fig. 5 is a rear view of the main body portion of the support shaft fixing member.

Fig. 6 (a) is a diagram illustrating a state in which the support shaft body fixing member is inserted from the lower groove side toward the upper groove 17 from the narrow width portion side, and (B) is a diagram illustrating a state in which the support shaft body fixing member is inserted from the lower groove side toward the upper groove 17 from the wide width portion side.

Fig. 7 (a) is a view showing a state where the support shaft body fixing member is inserted from the lower groove side toward the upper groove and from the narrow width portion side, and (B) is a view showing a state where the support shaft body fixing member is inserted from the lower groove side toward the upper groove and from the wide width portion side.

Fig. 8 is a diagram illustrating a relationship among widths of the lower groove, the wide portion, and the narrow portion.

Fig. 9 is a diagram illustrating a relationship among widths of the upper groove, the wide portion, and the narrow portion.

Fig. 10 is a side view of the articulator of the embodiment, showing a case where an angle θ between the maxillary support and the mandibular support is θ 2, where (a) is an overall view, and (B) is an enlarged view of the joint.

Fig. 11 is a side view of the articulator of the embodiment, showing a case where an angle θ between the maxillary support and the mandibular support is θ 3, where (a) is an overall view, and (B) is an enlarged view of the joint.

Fig. 12 is a side view of the articulator of the embodiment, showing a case where an angle θ between the maxillary support and the mandibular support is θ 4, where (a) is an overall view, and (B) is an enlarged view of the joint.

Fig. 13 is a view for explaining the mounting of the support shaft body to the articulator.

Fig. 14 is a view showing a state of the articulator with respect to the support shaft fixing member.

Detailed Description

Hereinafter, an occluder 1 according to an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a perspective view showing a state in which an articulator 1 according to an embodiment of the present invention is attached to a support shaft body 70. Fig. 2 is an exploded perspective view of the state in which the support shaft body fixing member 80 is detached from the articulator 1. Fig. 3 is a rear view of the articulator 1 in a state of being detached from the support shaft body fixing member 80. Fig. 4 is a view showing a state where the support shaft body fixing member 80 is detached from the articulator 1 and the maxillary support portion 10 and the mandibular support portion 20 are closed, where (a) is an overall view and (B) is an enlarged view of the joint portion.

The articulator 1 includes an upper jaw model 40, a upper jaw support 10 for supporting the upper jaw model 40, a lower jaw model 50, a lower jaw support 20 for supporting the lower jaw model 50, and a support shaft fixing member 80 for fixing the upper jaw support 10 and the lower jaw support 20 to the support shaft 70.

The rear sides of the maxillary support portion 10 and the mandibular support portion 20 are rotatably coupled to the joint portion 30 about an axis a extending in the left-right direction.

In the following description, the side of the maxillary model 40 and the mandibular model 50 fixed to the articulator 1 on which the front teeth are disposed is referred to as the front side, and the front-back, left-right, and up-down directions are defined.

In the drawings, for members which are provided in a pair in left-right symmetry and both of which are shown, R on the right side or L on the left side is denoted at the end of the reference numeral. In the following description, unless it is necessary to specifically distinguish between the left and right sides, R indicating the right side or L indicating the left side is not indicated and the description is incorporated.

(Upper jaw supporting part 10)

The upper jaw support portion 10 is integrally molded from a hard synthetic resin, and includes a plate-like upper jaw fixing portion 11 to which the upper jaw model 40 is fixed, a pair of upper jaw posterior extension portions 12 extending rearward from the upper jaw fixing portion 11, and an upper connecting portion 13 connecting the pair of upper jaw posterior extension portions 12 to each other.

(Upper jaw securing part 11)

The maxillary fixing part 11 has a horizontally long rectangular plate shape. The maxilla model 40 is provided with 2 bolt holes (not shown) in bilateral symmetry. The upper jaw fixing part 11 is provided with 2 upper model mounting holes 111a for inserting bolts into bolt holes provided in the upper jaw model 40.

The 2 upper mold attachment holes 111a of the maxillary fixing part 11 are all U-shaped and open downward.

(Upper jaw posterior extension 12)

The pair of maxillary posterior extension portions 12 extend posteriorly from one end side and the other end side in the longitudinal direction of the posterior surface of the maxillary fixing portion 11. As shown in fig. 4, the pair of maxillary posterior extension portions 12 extend obliquely downward and posterior in a state in which the maxillary phantom 40 fixed to the maxillary fixing portion 11 is horizontal.

(Upper connecting part 13)

The upper coupling portion 13 is a portion that couples the rear sides of the pair of maxillary posterior extensions 12, and includes: a pair of posterior cylindrical portions 14 provided at the posterior sides of the pair of posterior maxillary extension portions 12, respectively; an upper concave portion 15 connecting the rear cylindrical portions 14; a pair of spherical condylar portions 31 extending leftward and rightward from the posterior cylindrical portion 14; and a stopper 19 extending forward of the upper recess 15.

(1 st engaging part 61, 2 nd engaging part 62, 3 rd engaging part 63)

A 1 st engaging portion 61L, a 2 nd engaging portion 62L, and a 3 rd engaging portion 63L are provided on a left lower portion of the left rear cylindrical portion 14L so as to project outward in a radial direction of an axis line a which is also an axis line of the rear cylindrical portion 14L. Similarly, 3 of the 1 st engaging portion 61R, the 2 nd engaging portion 62R, and the 3 rd engaging portion 63R are provided on the right lower portion of the right rear columnar portion 14R so as to protrude radially outward of the axis a which is also the axis of the rear columnar portion 14R.

As shown in fig. 4, in a state where the maxilla model 40 and the mandible model 50 are closed (in a state where both teeth are attached to each other), the 1 st engaging portion 61 and the 2 nd engaging portion 62 are provided at a lower portion of the rear cylindrical portion 14, and the 3 rd engaging portion 63 is provided at an upper portion of the rear cylindrical portion 14.

Further, the radial distance from the axis a of the tip of the 2 nd engaging portion 62 is larger than the radial distance from the axis a of the tip of the 1 st engaging portion 61.

(Upper concave part 15)

As best shown in fig. 2, the upper recessed portion 15 connects the rear cylindrical portion 14R and the rear cylindrical portion 14L, and has a U-shape in which an outer surface (front surface) protrudes forward and an inner surface (rear surface) is recessed forward. Upper grooves 17 extending vertically and having upper ends not penetrating therethrough and lower ends penetrating therethrough are provided in left and right portions of the inner surface of the upper recessed portion 15 facing each other.

(condylar projection 31)

The condylar portion 31 is a portion of the articular portion 30. The condylar portions 31 are spherical members extending leftward and rightward from the posterior cylinder portion 14, the right condylar portion 31R protrudes rightward from the posterior cylinder portion 14 provided at the rear of the right maxillary posterior extension 12, and the left condylar portion 31L protrudes leftward from the posterior cylinder portion 14 provided at the rear of the left maxillary posterior extension 12.

(stopper 19)

The stopper 19 (as shown in fig. 4) has a downward surface 19a projecting and extending forward from the upper recess 15.

(mandible support 20)

The lower jaw support 20 is integrally molded from a hard synthetic resin, and includes a plate-shaped lower jaw fixing portion 21 to which the lower jaw model 50 is fixed, a pair of lower jaw rear extension portions 22 extending rearward from the lower jaw fixing portion 21, and a lower connecting portion 23 connecting the pair of lower jaw rear extension portions 22.

(lower jaw securing part 21)

The lower jaw fixing portion 21 is a horizontally long rectangular plate. The lower jaw model 50 is provided with 2 bolt holes (not shown) in bilateral symmetry. The lower jaw fixing portion 21 is provided with 2 lower model mounting holes 211a for inserting bolts into bolt holes provided in the lower jaw model 50.

Each of the 2 lower mold attachment holes 211a of the lower jaw fixing portion 21 is U-shaped and opens upward.

(lower jaw rear extension 22)

The pair of mandible posterior extension portions 22 extend posteriorly from one end side and the other end side in the longitudinal direction of the posterior surface of the mandible fixing portion 21. The pair of mandibular rearward extension portions 22 extend obliquely upward and rearward in a state in which the mandibular model 50 fixed to the mandibular fixing portion 21 is horizontal.

(lower connecting part 23)

The lower linking portion 23 extends to the left and right at a portion linking the rear sides of the pair of mandibular rearward extending portions 22 slightly below the condylar portions 32. The lower connecting portion 23 includes a pair of engagement receiving portions 33 on the mandible rearward extending portion 22 side and a lower concave portion 35 provided between the engagement receiving portions 33 on both sides.

(condylar tract portion 32)

The condylar portion 32 is also a part of the joint portion 30, is a pair of members provided on the rear sides of the pair of mandibular rearward extending portions 22, is a U-shaped member provided on the rear side of the mandibular rearward extending portion 22, and is a substantially U-shape that includes an upper wall portion 32a and a lower wall portion 32b extending obliquely rearward and upward from the rear side in side view and opens obliquely rearward and upward.

The inner surface of the proximal end side (anterior side) of the condylar portion 32 is a concave curved surface portion corresponding to the shape of the condylar portion 31.

The interval between the upper wall portion 32a and the lower wall portion 32b of the condylar portion 32 gradually narrows from the diameter r of the condylar portion 31 toward the posterior side.

An upper projection 36a and a lower projection 36b are provided on the rear side of the opposing surfaces of the upper wall 32a and the lower wall 32b so as to project inward. The spacing w of the upper tab 36a from the lower tab 36b is less than the diameter r of the condylar-tab 31, i.e., w < r.

The condylar portion 32 holds the condylar portion 31 on the anterior side (proximal side), and the mandibular support portion 20 is supported so as to be rotatable about the axis a with respect to the maxillary support portion 10.

(engaging receiving part 33)

As described above, the pair of engagement receiving portions 33 are provided on the side surfaces of the pair of mandibular rearward extending portions 22 that face each other, slightly below the condylar portion 32, and have a substantially rectangular cross section that is perpendicular to the axis a.

(lower concave part 35)

The lower recess 35 is a U-shaped member provided between the pair of engagement receiving portions 33, and has an outer surface protruding forward and an inner surface recessed forward, substantially in the same manner as the upper recess 15.

Lower grooves 34 extending vertically and having upper and lower ends penetrating therethrough are formed in the inner surface of the lower recess 35 at the left and right portions facing each other. When mandibular support portion 20 and maxillary support portion 10 are at a predetermined angle, lower groove 34 and upper groove 17 are aligned on the same line.

(stop receiving part 24)

The front side of the lower recess 35 is a stopper receiving portion 35a, and an upward surface 35aa thereof abuts against the downward surface 19a of the stopper portion 19 in a state where the maxillary support portion and the mandibular support portion are closed (closed state) shown in fig. 4.

(supporting shaft fixing member 80)

The support shaft fixing member 80 shown in fig. 1 includes a main body 81 provided with a screw hole 81a extending in the front-rear direction, and a screw member 82 screwed into the screw hole 81 a. Fig. 5 is a view showing the support shaft body fixing member 80, where (a) is a view seen from one of the front-rear directions, (B) is a rear view, and (C) is a view seen from the other of the front-rear directions.

The main body 81 supporting the shaft-body fixing member 80 includes wide portions 84 provided in the left-right direction and narrow portions 85 extending in the up-down direction and continuing from the wide portions 84.

The screw member 82 includes a screw portion 82a screwed into the screw hole 81a and a screw turning portion 82b provided at a rear end of the screw portion 82 a.

Fig. 6 (a) is a diagram illustrating a state in which the support shaft body fixing member 80 is inserted from the lower groove 34 side toward the upper groove 17 and from the narrow width portion 85 side, and fig. 6 (B) is a diagram illustrating a state in which the support shaft body fixing member 80 is inserted from the lower groove 34 side toward the upper groove 17 and from the wide width portion 84 side.

Fig. 7 is a view for explaining the lengths (vertical lengths) of the wide portion 84 and the narrow portion 85 of the support shaft body fixing member 80, where (a) is a state where the support shaft body fixing member 80 is inserted from the lower groove 34 side toward the upper groove 17 and from the narrow portion 85 side, and (B) is a state where the support shaft body fixing member 80 is inserted from the lower groove 34 side toward the upper groove 17 and from the wide portion 84 side. In both fig. 7 (a) and (B), the upper groove 17 and the lower groove 34 are aligned substantially on a straight line.

As shown in the drawing, when the upper groove 17 and the lower groove 34 are substantially aligned on a straight line, a gap T exists between the upper groove 17 and the lower groove 34, and the length of the gap is TL. When the length of the upper groove 17 is UL, the length of the lower groove 34 is DL, the length of the wide portion 84 is LL, and the length of the narrow portion 85 is SL, the following relationship exists in the embodiment.

LL < UL + TL < SL + LL and SL < UL + TL + DL … (1)

In the embodiment, although not limited to this, there is a relationship of SL < UL, LL > SL, and LL ≈ UL.

Fig. 8 is a diagram illustrating the relationship among the widths of the lower groove 34, the wide portion 84, and the narrow portion 85. Fig. 9 is a diagram illustrating the relationship among the widths of the upper groove 17, the wide portion 84, and the narrow portion 85.

(lower tank 34)

The inner surface of the lower channel 34 includes a front face 34f, a rear face 34b, and a side face 34 s.

The distance SW between the outer edges of the narrow portions 85 provided on the left and right sides is shorter than the distance DWI between the inner edges of the rear surfaces of the lower grooves 34 provided on the left and right sides.

The distance LW between the outer edges of the laterally disposed wide portions 84 is longer than the distance DWI between the inner edges of the rear surfaces of the laterally disposed lower grooves 34.

That is, DWO represents the distance between the side surfaces of the lower groove 34 provided on the left and right sides, and the following relationship exists.

SW＜DWI＜LW＜DWO…(2)

(Upper tank 17)

The inner surface of the upper groove 17 includes a front surface 17f, a rear surface 17b, and a side surface 17 s.

The distance SW between the outer edges of the narrow portions 85 provided on the left and right sides is longer than the distance UWI between the inner edges of the rear surfaces of the upper grooves 17 provided on the left and right sides.

The distance LW between the outer edges of the laterally disposed wide portions 84 is longer than the distance UWI between the inner edges of the rear surfaces of the laterally disposed upper grooves 17.

That is, when the distance between the side surfaces of the upper grooves 17 provided on the left and right sides is UWO, the following relationship exists.

UWI＜SW＜LW＜UWO…(3)

(stationary state)

From the above relationship, in the case of fig. 7 (a) in which the insertion is performed from the lower groove 34 side toward the upper groove 17 and from the narrow portion 85 side, the wide portion 84 located below the narrow portion 85 engages with the upper groove 17 and the lower groove 34. Therefore, the upper jaw support portion provided with the upper groove 17 is in a fixed state in which the movement is restricted by the wide width portion 84, and the lower jaw support portion 20 provided with the lower groove 34 is also restricted by the wide width portion 84.

(rotational state)

On the other hand, in the case of fig. 7 (B) in which the insertion is made from the lower groove 34 side toward the upper groove 17 side and from the wide width portion 84 side, the wide width portion 84 engages with the upper groove 17. Therefore, the maxillary support provided with the upper groove 17 is restricted from moving. However, since the back surface of the narrow portion 85 at the position corresponding to the lower groove 34 is not covered by the back surface 34b of the lower groove 34, the mandible supporting portion 20 provided with the lower groove 34 can be rotated forward.

Next, the assembling steps of the articulator 1 will be explained.

(fixation of the Upper jaw model 40 to the Upper jaw fixing part 11)

The upper jaw fixing part 11 is disposed on the rear surface of the upper jaw model 40, and a pair of bolt holes (not shown) of the upper jaw model 40 and a pair of upper model mounting holes 111a of the upper jaw fixing part 11 are aligned.

The maxillary model 40 is fixed to the front surface of the maxillary fixing portion 11 by screwing the bolts 111 into the bolt holes of the maxillary model 40 through the pair of upper model mounting holes 111a of the maxillary fixing portion 11.

(lower jaw fixing part 21 of lower jaw model 50)

Further, the lower jaw fixing portion 21 is disposed behind the lower jaw model 50, and the pair of bolt holes (not shown) of the lower jaw model 50 and the pair of lower model mounting holes 211a of the lower jaw fixing portion 21 are aligned.

The lower jaw model 50 is fixed to the front surface of the lower jaw fixing section 21 by screwing bolts 211 into bolt holes (not shown) of the lower jaw model 50 through a pair of lower model mounting holes 211a of the lower jaw fixing section 21.

At this time, since the upper die attachment hole 111a of the maxillary fixing portion 11 and the lower die attachment hole 211a of the mandibular fixing portion 21 are U-shaped, the bolt hole of the maxillary model 40 and the bolt hole of the mandibular model 50 are easily aligned.

Further, when the maxilla model 40 is separated from the maxilla support portion 10 or the mandible model 50 is separated from the mandible support portion 20, the upper model mounting holes 111a and the lower model mounting holes 211a of the maxilla fixing portion 11 and the mandible fixing portion 21 are U-shaped, and therefore, the separation can be achieved without completely removing the bolts 111 and 211 from the maxilla model 40 and the mandible model 50 and only by loosening them. Therefore, it is possible to easily attach different upper jaw models 40 to the upper jaw support 10 and different lower jaw models 50 to the lower jaw support 20.

Since the upper mold mounting hole 111a of the maxillary fixing portion 11 is U-shaped and opens downward, the bolt 111 is first inserted into the bolt hole of the maxillary mold 40, and is held in a state where a gap is formed between the rear surface of the maxillary mold 40 and the bolt head. Next, the maxillary fixing part 11 is inserted into the gap from above. Then, the maxillary support portion 10 is attached to the maxillary model 40 by further screwing the bolts 111.

This makes it possible to easily attach the upper jaw fixing part 11 to the upper jaw model 40.

Further, since the lower die attachment hole 211a of the lower jaw fixing portion 21 is also U-shaped and opens upward, the bolt 211 is first inserted into the bolt hole of the lower jaw model 50, and the rear surface of the lower jaw model 50 is kept in a state where a gap is provided between the bolt head and the bolt hole. Next, the lower jaw model 50 is inserted into the gap from below. Then, the bolt 211 is further screwed, whereby the lower jaw fixing portion 21 can be easily attached to the lower jaw model 50.

(installation of condylar-protrusion 31 to condylar-tract 32)

Next, the pair of condylar portions 31 are mounted to the pair of condylar portions 32, respectively.

Specifically, the condylar portion 31 is inserted from the rear side between the upper and lower projections 36a and 36b of the U-shaped condylar portion 32. At this time, since the distance w between the upper projection 36a and the lower projection 36b is smaller than the diameter r of the condylar portion 31, when the condylar portion 31 is inserted between the upper projection 36a and the lower projection 36b, the upper wall portion 32a and the lower wall portion 32b are elastically deformed to open the distance therebetween, and the condylar portion 31 is inserted into the U-shaped interior beyond the upper projection 36a and the lower projection 36 b.

When the condylar portion 31 moves toward the bottom (proximal side, anterior side) of the U-shape of the condylar portion 32, the upper wall portion 32a and the lower wall portion 32b return to the initial state from elastic deformation, and return to a state in which the distance w between the upper projection 36a and the lower projection 36b is smaller than the diameter r of the condylar portion 31. Thus, the condylar portions 31 do not fall out unless subjected to an external force.

Thereby, the condylar portion 31 and the condylar portion 32 constitute the joint portion 30, and the condylar portion 31 is rotatably held at the U-shaped bottom (proximal side, anterior side) of the condylar portion 32. The rear sides of the maxillary support portion 10 and the mandibular support portion 20 are connected to be rotatable about an axis a extending in the left-right direction at the joint portion 30.

(1 st state)

The 1 st state shown in fig. 4 in which the maxillary support portion 10 and the mandibular support portion 20 are closed (the angle θ between the maxillary support portion 10 and the mandibular support portion 20 is θ 1) is a normal occlusion position in the case where the maxillary model 40 and the mandibular model 50 are dentures.

At this time, the 1 st engaging portion 61 and the 2 nd engaging portion 62, which project radially outward from the axis a provided at the lower portion of the rear cylindrical portion 14, are located behind the engaging receiving portion 33 having a rectangular cross section.

When the maxillary support portion 10 and the mandibular support portion 20 move in directions away from each other (the direction in which θ becomes larger than θ 1, and the direction of the arrow X1 in fig. 4 (B)), the 1 st engagement portion 61 comes into contact with the engagement receiving portion 33.

To further move the maxillary support 10 and the mandibular support 20 in directions away from each other, the 1 st engaging portion 61 needs to go over the engaging receiving portion 33, and at this time, the condylar portion 31 elastically deforms the upper wall portion 32a and the lower wall portion 32b to move rearward in the gap of the U-shape indicated by the arrow X2.

Thus, for example, the maxillary support 10 and the mandibular support 20 do not open unless the operator intentionally applies a force to open them.

In the state 1 shown in fig. 4 (i.e., the normal occlusion position of the dentures), the downward surface 19a of the stopper portion 19 abuts against the upward surface 35aa of the stopper receiving portion 35 a. Therefore, the maxillary support 10 and the mandibular support 20 (the maxillary model 40 and the mandibular model 50) do not come closer. Therefore, for example, even when at least one of the upper jaw model 40 and the lower jaw model 50 is an edentulous jaw, the normal occlusion position in the case of the dental jaw shown in fig. 4 can be maintained.

(2 nd state)

Fig. 10 is a side view of the articulator 1, showing a case where an angle θ between the maxillary support 10 and the mandibular support 20 is a 2 nd angle θ 2 larger than θ 1, where (a) is an overall view, and (B) is an enlarged view of a joint portion.

When the operator intentionally applies a force from the state shown in fig. 4, the condylar portion 31 elastically deforms the upper wall portion 32a and the lower wall portion 32b to move rearward of the U-shaped gap, and the 1 st engagement portion 61 goes over the corner of the engagement receiving portion 33, resulting in the state shown in fig. 10.

At this time, the rear upper corner of the engagement receiving portion 33 is located between the 1 st engagement portion 61 and the 2 nd engagement portion 62. The condylar protrusion 31 does not completely abut against the bottom (proximal side, front side) of the U-shaped gap, and the upper wall portion 32a and the lower wall portion 32b are in a state of slight elastic deformation. Therefore, the condylar portion 31 is pressed in the direction of arrow X3 in the figure by the force that attempts to return the upper wall portion 32a and the lower wall portion 32b to the initial state.

Therefore, the 1 st engaging portion 61 is pressed toward the engaging receiving portion 33, and the maxilla support portion 10 and the mandible support portion 20 are fixed at the positions shown in fig. 10.

(3 rd state)

Fig. 11 is a side view of the articulator 1, showing a case where an angle θ between the maxillary support 10 and the mandibular support 20 is θ 3 larger than θ 2, where (a) is an overall view and (B) is an enlarged view of the joint portion.

When the operator intentionally applies a force from the state shown in fig. 10, the condylar portion 31 elastically deforms the upper wall portion 32a and the lower wall portion 32b to move rearward of the U-shaped gap, and the 2 nd engaging portion 62 passes over the corner of the engaging receiving portion 33, resulting in the state shown in fig. 11.

Since the radial distance y2 from the axis a of the distal end of the 2 nd engaging portion 62 (as shown in fig. 4 b) is greater than the radial distance y1 from the center of the condylar portion 31 of the distal end of the 1 st engaging portion 61 (as shown in fig. 4 b), a force is required more when the state changes from the 2 nd state to the 3 rd state than when the state changes from the 1 st state in fig. 4 to the 2 nd state in fig. 10.

In the state of fig. 11, the maxillary model 40 is forced by its own weight in a direction to decrease the angle θ. However, the rear edge of the 2 nd engaging portion 62 abuts against the upper surface of the engaging receiving portion 33. The condylar protrusion 31 cannot elastically deform the upper wall portion 32a and the lower wall portion 32b by a force of the weight of the maxilla model 40 to move rearward of the U-shaped gap, and the maxilla support portion 10 and the mandible support portion 20 are held at the positions shown in fig. 11.

(4 th state)

Fig. 12 is a side view of the articulator 1, showing a case where an angle θ between the maxillary support 10 and the mandibular support 20 is a 4 th angle θ 4 larger than θ 3, where (a) is an overall view and (B) is an enlarged view of a joint portion.

When the operator rotates the maxillary support part 10 from the state shown in fig. 11 to the 4 th angle θ 4 by increasing the angle θ with respect to the mandibular support part 20, the 3 rd engaging part 63 abuts against the rear corner of the engaging receiving part 33 and does not rotate any further.

In this way, since the space between the maxillary support 10 and the mandibular support 20 can be maintained in the 1 st state θ 1, the 2 nd state θ 2, the 3 rd state θ 3, and the 4 th state θ 4, the angle between the maxillary support 10 and the mandibular support 20 can be maintained at a position according to the application, and the operation is easy in the case of creating a dental prosthesis, a dental restoration, or the like.

Fig. 13 is a view for explaining a method of attaching the support shaft body 70 to the articulator 1.

(support shaft body 70)

The support shaft body 70 has a cylindrical shape, and a flat portion 71 is provided along the longitudinal direction at a part of the circumference. The flat portion 71 is provided with a screw insertion hole 72.

The circumferential curvature of the support shaft body 70 substantially matches the curvature of the inner surfaces (rear surfaces) of the upper concave portion 15 and the lower concave portion 35 (not shown in fig. 13).

When the support shaft body 70 is brought into contact with the inner surfaces of the upper concave portion 15 and the lower concave portion 35 provided at the rear portions of the upper jaw support portion 10 and the lower jaw support portion 20 so that the upper jaw support portion 10 and the lower jaw support portion 20 form a predetermined angle θ 5, the upper groove 17 and the lower groove 34 are aligned on a straight line. In either state of fig. 6 (a) and (B), the main body 81 is attached so that the wide portion 84 and the narrow portion 85 of the main body are inserted into the upper groove 17 and the lower groove 34 which are located on the same straight line.

When the screw turning portion 82b is turned in a state where the tip of the screw portion 82a is inserted into the screw insertion hole 72, and the clutch 1 is held at a predetermined position of the support shaft body 70.

Generally, a lower end of a support shaft body that holds the bite device is provided upright on a fixed base, and a head is attached to an upper end thereof. In addition, a normal articulator different from the present embodiment is provided with a through hole extending vertically in the rear portion. When the support shaft is attached to and detached from the articulator, the head is detached from the support shaft, and the articulator is slid to an appropriate horizontal position by being inserted into the through hole of the articulator from the upper end of the support shaft. Therefore, when the articulator is attached to and detached from the support shaft body, the head portion must be detached from the support shaft body.

However, in the present embodiment, first, the support shaft body fixing member 80 is detached from the upper groove 17 and the lower groove 34. Then, the support shaft body 70 is relatively moved to the rear side in the horizontal direction (the side opposite to the upper jaw model 40 and the lower jaw model 50) orthogonal to the axis of the support shaft body 70, and moved from the upper concave portion 15 and the lower concave portion 35 as the concave portions. This allows the head and the fixed base, not shown, to be attached to and detached from the supporting shaft body 70 with respect to the articulator 1 without detaching the head and the fixed base from the supporting shaft body 70. Therefore, the assembly and disassembly are easy.

As described above, when the insertion is performed from the lower groove 34 side to the upper groove 17 side and from the narrow portion 85 side as shown in fig. 6 (a), the state of fig. 7 (a) is obtained. In this case, the wide portion 84 located below the narrow portion 85 engages with the upper groove 17 and the lower groove 34. Therefore, the maxillary support 10 provided with the upper groove 17 is in a fixed state in which the movement is restricted by the wide width portion 84 and the mandibular support 20 provided with the lower groove 34 is also restricted by the wide width portion 84.

When the insertion is made from the lower groove 34 side toward the upper groove 17 and from the wide portion 84 side as shown in fig. 6 (B), the state of fig. 7 (B) is obtained. In this case, the wide portion 84 engages with the upper groove 17. Therefore, the movement of the upper jaw supporting part 10 provided with the upper groove 17 is restricted. However, since the back surface of the narrow portion 85 at the position corresponding to the lower groove 34 is not covered by the back surface 34b of the lower groove 34, the mandible supporting portion 20 provided with the lower groove 34 can be rotated forward.

Therefore, depending on the use of the user, the insertion direction of the support shaft body fixing member 80 into the lower groove 34 and the upper groove 17 can be changed, and whether to fix or turn the lower jaw support portion 20 while being held by the support shaft body 70 can be selected.

Fig. 14 is a view showing a state of the articulator 1 in a case where the support shaft body fixing member 80 is released. According to an embodiment, the upper end of the upper groove 17 is not open. Therefore, as shown in the drawing, the upper end wall 17a of the upper groove 17 abuts against and is supported by the upper end of the wide portion 84 (the narrow portion 85 depending on the orientation) of the body 81. Therefore, when the screw turning portion 82b is rotated to release the support shaft fixing member 80, the articulator 1 is urged downward by gravity, but the articulator 1 can be prevented from falling as long as the operator holds the screw turning portion 82 b.

While the preferred embodiments of the bite piece 1 according to the present invention have been described above, the present invention is not limited to the above embodiments and can be implemented in various ways.

For example, in the embodiment, the condylar portion 31 is provided in the upper jaw support portion 10, and the condylar portion 32 is provided in the lower jaw support portion 20, but the present invention is not limited thereto. That is, the maxillary support portion may be provided with the condylar portion and the mandibular support portion may be provided with the protrusion portion.

In the embodiment, the condylar portion 31 is formed in a spherical shape, but the present invention is not limited thereto, and may be formed in a cylindrical shape, for example.

The present invention is suitable for use in an articulator for training for education practice and instruction use, and an articulator for a technician used for a dental prosthesis or a dental prosthesis.

Description of the reference numerals

1 occluding device

10 maxillary support

11 maxillary fixation part

12 maxillary posterior extension

13 upper connecting part

14 rear cylindrical part

14L rear cylindrical part

14R rear cylindrical part

15 upper side concave part

17 upper groove

17a upper end wall

19 stop part

19a facing downwards

20 mandible support

21 lower jaw fixing part

22 mandible rear extension part

23 lower connecting part

24 stop socket

30 joint part

31 condylar portion

31L condylar portion

31R Condyle

32 condylar tract portion

32a upper wall part

32b lower wall part

33 engaging receiving part

34 lower groove

34b back side

34f front face

34s side surface

35 lower recess

35a stop receiver

35aa face upward

36a upper projection

36b lower projection

40 maxillary model

50 lower jaw model

61 st engaging part

61L 1 st engaging part

61R 1 st engaging part

62 nd 2 nd engaging part

62L 2 nd engaging part

62R 2 nd engaging part

63 rd 3 engaging part

63L 3 rd engaging part

63R 3 rd engaging part

70 support shaft body

71 flat part

72 hole for insertion

80 support shaft fixing member

81 main body part

81a screw hole

82 screw component

82a screw part

82b screw turning part

84 wide part

85 narrow part

111 bolt

111a upper mold mounting hole

211 bolt

211a lower model mounting hole