JP2014171834A - Method and apparatus for fabricating dental clasp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate fabrication of wire clasp that fits a patient well without needing skill.SOLUTION: Wire 10 is curved in a wave shape having a U-shaped valley 2 and inverted U-shaped first and second peaks 3, 4, the shape in which the valley and the first and second peaks have the same curvature and the valley has a shape corresponding to the undercut. A portion of the valley is curved in an arch shape, and portions of the first and second peaks are twisted around base points by a predetermined acute angle so that the portions extending outward from peak vertices 8, 9 of the peaks using the vicinities of boundaries b, c with the valley as the base points face the outside of the arch surface formed by the portion of the valley. A remaining portion of the first peak is made a clasp point part of the clasp by cutting the wire at a first predetermined position e beyond the first peak vertex, and a portion to a second predetermined position f beyond the second peak vertex from the valley is made a clasp arm part of the clasp. The portion extending outward from the second predetermined position is curved to make a fixing part of the clasp.

Description

  The present invention is provided in a denture base of a partial denture substituted for a missing tooth, and engages with a tooth adjacent to the partial denture, thereby supporting and fixing the denture base to the tooth, particularly a wire clasp. The present invention relates to a method and an apparatus for manufacturing the device.

The partial denture includes an artificial tooth, a denture base that holds the artificial tooth, and a clasp that is provided in the denture base and that is detachably fitted to a tooth adjacent to the partial denture.
There are two types of clasps: a wire clasp that is manufactured by bending a metal wire material and a cast clasp that is manufactured by casting an alloy, and has the function of preventing the denture base from coming off and wobbling by engaging the toothed teeth. (For example, refer to Patent Document 1).

A wire clasp is usually manufactured by bending a metal wire material (wire) with a diameter of about 0.9 to 1.2 mm by hand using a dedicated pliers called forceps so as to conform to the shape of a tooth. ing.
In this manufacturing process, first, the target tooth is shaped from the patient's mouth and a gypsum model is manufactured, then the tooth for the partial denture is selected from the remaining teeth in the gypsum model, and the wire However, it is bent into a hook shape so as to conform to the curved shape of the tooth decay by hand using forceps.

And the wire clasp is embedded in the denture base and integrated with the fixed portion, the hook extends from the fixed portion in the shape of a hook, and the arm portion that surrounds the teeth on the outside of the undercut of the tooth decay, and the arm portion It has a shape with a cusp that enters the undercut of the tooth decay.
Thus, when the partial denture is mounted on the missing part of the tooth, the tip of the wire clasp extending from the denture base around the tooth engages with the undercut of the tooth, so that the entire wire clasp is spring-loaded. It is supposed to function as.

  In this case, the amount of wire clasp penetration into the undercut, and thus the degree of bending of the cusp, greatly affects the feeling of wearing the partial denture and the load on the dent at the time of attachment. The setting of the bending of the apex is very important for wire clasp production.

  However, making the wire clasp is done manually with forceps, and in addition, the wire has great rigidity and requires considerable force to bend, making a wire clasp that fits well with the patient For this, considerable skill and labor were required (see, for example, Patent Document 2).

International Publication WO2006 / 131969 Pamphlet JP 2005-329197 A

  Therefore, an object of the present invention is to make it possible to easily manufacture a wire clasp that is well adapted to a patient without skill.

In order to solve the above-mentioned problem, the first invention is provided in a denture base of a partial denture serving as a substitute for a missing tooth, and is engaged with a tooth adjacent to the partial denture, thereby making the denture base the tooth A wire clasp that is supported and fixed to a fixed portion embedded in the denture base and integrated with the denture base, connected to the fixed portion and extended from the fixed portion, A hook part disposed so as to surround the hook teeth on the outer side of the undercut on the labial surface or the tongue side surface, and connected to the tip of the hook arm part so as to extend from the hook arm part and engage with the undercut In the method of manufacturing a thing consisting of the cusp,
(1) A wave shape having a predetermined length of wire on a plane, having U-shaped valleys and inverted U-shaped first and second peaks connected to both sides of the valleys. The valley and the first and second peaks have substantially the same curvature, and the valley is curved into a shape corresponding to the undercut,
(2) The portion of the trough of the wire curved into the wave shape is curved in an arch shape on one side of the plane, and each of the first and second crest portions is near the boundary with the trough. As a base point, a predetermined acute angle twist is made around the base point so that the portions extending outward from the vertices of the first and second peaks are respectively directed to the outside of the arch surface formed by the valley portion, By cutting the wire at a first predetermined position across the top of the first mountain to the opposite side of the trough, the remaining portion of the first mountain is used as the crest of the clasp, The portion from the valley to the second predetermined position beyond the top of the second mountain is the arm portion of the clasp,
(3) The method is characterized in that a portion extending outward from the second predetermined position is further curved to form the fixing portion of the clasp.

  In order to solve the above-mentioned problem, the second invention is provided in a denture base of a partial denture serving as a substitute for a missing tooth, and engages with a tooth adjacent to the partial denture, thereby making the denture base A wire clasp that is supported and fixed to the tooth decay, and is fixed to the denture base and integrated with the denture base, connected to the fixation portion and extended from the fixation portion, and the cheek of the tooth decay A side arm, a side surface of the lip side, or a side surface of the lingual side of the tongue, and a hook arm portion disposed so as to surround the hook tooth; An apparatus for manufacturing a pair of cusps, comprising a male mold and a female mold paired with each other, the male mold having one side and the other side parallel to each other, and a side surface extending therebetween On one side of the male mold, The projection onto one surface is U-shaped, and a projection having an upper end surface with a width corresponding to the diameter of the wire is provided, and the projection forms a portion near the top of the U-shape, and A first projection portion curved in an arch shape whose projection onto a surface orthogonal to the axis is concave or convex upward, and connected to both ends of the first projection portion, and extends from the first projection portion. When the first projecting portion is curved in the concave arch shape, the height gradually increases in the length direction from the connection position with the first projecting portion and reaches a predetermined maximum point. After that, the height is formed so that the height gradually decreases. However, when the first protruding portion is curved into the convex arch shape, the length from the connection position with the first protruding portion is longer. After the height gradually decreases in the direction and reaches the predetermined minimum point, the height gradually increases And the second and third protruding portions are curved in an arch shape in which the first protruding portion is the concave, When viewed in the axial direction of the U-shape, the male shape extends in a C shape from the one surface, but when the first projecting portion is curved into the concave arch shape, the axial direction of the U-shape When viewed from above, the male mold extends in an inverted C shape from the one surface, and the female mold is composed of one surface parallel to each other and the other surface, and a side surface extending between them. The projection onto the one surface is U-shaped, and a groove corresponding to the male protrusion is provided, the groove including a first groove portion corresponding to the first protrusion portion, and the first protrusion A second groove portion connected to one end of the first groove portion and corresponding to the second protrusion portion; And a third groove portion corresponding to the third projecting portion. The first groove portion forms a portion near the apex of the U-shape and is connected to the U-shaped shaft. When the projection onto the orthogonal surface is curved in an arch shape that is convex or concave upward, and each of the second and third groove portions is curved in an arch shape in which the first groove portion is the convex The first groove portion is formed so that the depth gradually increases in the length direction from the connection position with the first groove portion and reaches the deepest point, and then the depth gradually decreases. When the groove portion is curved in the shape of the concave arch, the depth gradually decreases in the length direction from the connection position with the first groove portion and reaches the shallowest point, and then the depth is reached. Are formed so as to gradually increase, and the second and third groove portions are arches in which the first groove portion is convex. In the case of bending in the axial direction of the U-shape, the female mold extends in a C-shape from the one surface, but in the case where the first groove portion is curved in the concave arch shape , When viewed in the axial direction of the U-shape, it extends in an inverted C shape from the one surface of the female mold, and the distal end surface of the second groove portion has a diameter corresponding to the wire, and the distal end surface A wire fixing hole extending through the inside of the female mold, and a tip of the third groove portion is open to a side surface of the female mold, and the male mold and the female mold Is mounted with the surfaces facing each other, the male mold and the female mold are spaced apart from each other, and the male mold and the female mold are in close contact with each other. The female mold includes a press mechanism for moving between the press positions. One end of the wire is inserted into the wire fixing hole, and after the wire is set in the groove, it is pressed by the male mold and the female mold so that the second groove portion and the second groove A wire portion located between the protrusion portions of the clasp is formed as the clasp portion of the clasp, and a wire portion located between the first and third groove portions and the first and third protrusion portions is the It is molded as the lower arm portion of the clasp, and further, a wire portion extending outside from the third groove portion and the third protrusion portion is molded as the fixing portion of the clasp. It is a device.

In the configuration of the second invention, preferably, the pressing mechanism is composed of a vise, and one of the male mold and the female mold is formed on one of the mutually facing surfaces of the fixed block and the movable block of the vise. The other of the male mold and the female mold is attached to the other of the surfaces facing each other.
More preferably, dowel grooves opened on the upper end surface of the block, which extend in the vertical direction and are related to the upper end, are formed on the opposed surfaces of the fixed block and the movable block of the vise, respectively. Formed on the other surface of each of the male mold and the female mold is provided with ant tenons that are paired with the dovetail grooves, and the male and female ant tenons are arranged on the fixed block. The male mold and the female mold are attached to the fixed block and the movable block by being fitted into the dovetail groove of the movable block.

According to the first aspect of the present invention, it is possible to easily manufacture a clasp having a shape that is well suited to a toothed tooth by simply bending the wire into a prescribed shape in a certain procedure without requiring skill.
The completed clasp is connected to the denture base in such a manner that the inside of the arch surface formed by the valley portion forming the arm portion is opposed to the tooth decay.
And when the partial denture provided with this clasp is attached to the patient, the clasp portion of the clasp enters the undercut over the length of about 1/3 of the interdental distance of the tooth and the arm portion is Arranged around the toothed teeth on the outside of the undercut, the clasp reliably engages without creating an unnecessary gap with the toothed teeth. Thereby, the partial denture is not easily detached or wobbled during the attachment of the partial denture, and the partial denture can be attached and detached without applying an extra load to the tooth.

  According to the second invention, after setting the wire in the groove of the female mold, the wire is formed into a predetermined shape by simply pressing the male mold and the corresponding male mold with each other using a press mechanism. By doing so, it is possible to easily manufacture the same clasp that can be manufactured by the method according to the first invention.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure explaining the dental clasp manufacturing method by one Example of this invention, (A) is a top view which shows the state which curved the wire in the waveform on the plane, (B) is the completed clasp. (However, the fixing part is cut) is a photograph taken in the vertical axis direction of the clasp with the flat part being cut, and (C) is the same clasp as shown in (B) on the plane. It is a photograph taken from diagonally above. It is a figure which shows the state which the wire clasp produced by the method and apparatus of this invention engaged with the toothed hook, (A) is the perspective view seen from the buccal side of a tooth, (B) is a tooth | gear. It is the perspective view seen from above, (C) is the top view seen from the upper direction of a tooth | gear. 1 is a perspective view of a dental clasp manufacturing apparatus according to the present invention. It is a figure which shows the metal mold | die with which the apparatus shown in FIG. 3 was equipped, (A) is a male perspective view, (B) is a female perspective view, (C) is a female plane. FIG.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.
The present invention provides a dental clasp, particularly a wire that is provided in a denture base of a partial denture that is used as a substitute for a missing tooth, and that supports and fixes the denture base to the tooth by engaging with a tooth adjacent to the partial denture. A method and apparatus for producing a clasp is provided.

FIG. 2 is a view showing a state in which a wire clasp manufactured by the method and apparatus according to the present invention is engaged with a toothed tooth, and FIG. 2 (A) is a perspective view as seen from the buccal side of a tooth, ) Is a perspective view seen from above the teeth, and (C) is a plan view seen from above the teeth.
Referring to FIG. 2, the wire clasp 1 is embedded in a denture base (not shown) and integrated with the fixing portion 13, and connected to the fixing portion 13 and extending from now on, and the buccal side surface of the toothed tooth 11. Or the labial side or the lingual side, in this embodiment, the lower arm 14 arranged to surround the undercut outside the undercut of the cheek side 12 and the tip of the upper arm 14 connected to and extending from the underside And a cusp 15 that engages the cut.

  1A and 1B are diagrams for explaining a method for producing a dental clasp according to the present invention. FIG. 1A is a plan view showing a state in which a wire is bent into a waveform on a plane, and FIG. 1B is a completed clasp. (However, in order to clarify the curved state of the clasp, the fixed part is cut) is a photograph taken in the longitudinal direction of the clasp with (C) shown in (B) This is a photograph taken from diagonally above, with the same clasp as the one on the plane.

In the method of manufacturing a wire clasp according to the present invention, first, as shown in FIG. 1A, a wire 10 having a predetermined length is stretched on a plane, and a U-shaped valley 2 (a portion between bc). And a wave shape having an inverted U-shaped first peak 3 (part between a and b) and a second peak 4 (part between cd) connected to both sides of the valley 2, The trough 2 and the first and second crests 3 and 4 have substantially the same curvature, and the trough 2 is bent into a shape corresponding to the undercut. Thus, for each of the different types of tooth decay, the valley 2 and the first and second peaks 3 and 4 are bent so as to have a curvature suitable for the tooth decay.
In this case, as shown in the figure, it is preferable to provide extension parts 5 and 6 on the outer sides of the first and second peaks 3 and 4 (the extension part 6 on the second peak 4 side is the clasp 1). A part of the fixed portion 13 of the first).

Next, as shown in FIGS. 1A to 1C, the portion of the valley 2 of the wire 10 curved in this wave shape is curved in an arch shape on one side of the plane, and the first and second The portions 5 and 6 extending outward from the vertices 8 and 9 of the first and second peaks 3 and 4 with the peaks 3 and 4 as the base points near the boundaries b and c with the valley 2, respectively, A first predetermined position where a predetermined acute angle is twisted around the base point so as to face the outside of the arch surface formed by the valley 2 portion, and the vertex 8 of the first peak 3 is crossed to the opposite side of the valley 2. By cutting the wire 10 with e, the remaining portion of the first peak 3 is used as the tip 15 of the clasp 1 and reaches the second predetermined position f beyond the second peak 4 from the valley 2. The portion is a clam arm 14 of the clasp 1.
In this case, the first predetermined position e corresponds to the tip of the heel portion 14 of the clasp 1, and the second predetermined position f corresponds to the proximal end of the heel arm portion 14 of the clasp 1, It is appropriately determined according to the size of the tooth for each tooth type. Further, the size of the angle (acute angle) twisted around the base point is determined so as to be adapted to the toothed teeth according to the kind of toothed teeth.

  Further, the portion extending outward from the second predetermined position f is further curved to form the fixing portion 13 of the clasp 1.

Thus, according to the present invention, it is possible to easily manufacture a clasp having a shape that is well suited to a toothed tooth by simply bending the wire into a prescribed shape in a certain procedure.
The completed clasp 1 is coupled to the denture base in such a manner that the inside of the arch surface formed by the portion of the valley 2 forming the arm portion 14 faces the toothed teeth 11.
And when the partial denture provided with this clasp 1 is mounted | worn with a patient, as shown in FIG.2 (C), the cusp part 15 of the clasp 1 is about 1/3 of the interdental distance s of the toothed hook 11. FIG. While entering the undercut over the length, the arm portion 14 is arranged to surround the toothed teeth on the outside of the undercut, and the clasp 1 can be surely generated without generating an unnecessary gap with the toothed teeth 11. Engage. Accordingly, the attached partial denture does not easily come off or wobble, and the partial denture can be attached and detached without applying an extra load to the tooth.

FIG. 3 is a perspective view of a dental clasp manufacturing apparatus according to the present invention. 4 is a view showing a mold provided in the apparatus shown in FIG. 3, (A) is a perspective view of a male mold, (B) is a perspective view of a female mold, and (C ) Is a plan view of a female mold.
3 and 4 are devices for manufacturing the same clasps manufactured by the above-described method, and therefore, the corresponding relationship with each component shown in FIG. 1 is clarified. Therefore, in FIG. 4A, the same numbers and symbols as those in FIG. 1 are added to the components corresponding to the components in FIG.

As shown in FIGS. 3 and 4, the apparatus according to the present invention includes a male mold 23 and a female mold 24 that are paired with each other.
The male mold 23 has a rectangular parallelepiped shape including one surface 23a and another surface 23b which are parallel to each other, and a side surface 23c extending therebetween, and the projection onto the one surface 23a is U-shaped on the one surface 23a of the male mold 23. A protrusion 25 having an upper end surface with a width corresponding to the diameter of the wire is provided.

The projection 25 forms a portion near the apex of the U-shape, and the first projection portion 25a curved in an arch shape in which the projection onto the surface orthogonal to the U-shaped axis is concave upward, and the first The projections 25a are connected to both ends of the projections 25a, extend from the first projections 25a, and gradually increase in height from the connection positions i and j to the first projections 25a in a longitudinal direction. After reaching g and h, the second and third protrusion portions 25b and 25c are formed so that the height gradually decreases.
The second and third projecting portions 25b and 25c further extend in a C shape from one surface 23a of the male mold 23 when viewed from the U-shaped shaft.

The female mold 24 has a rectangular parallelepiped shape including one surface 24a and another surface 24b that are parallel to each other, and a side surface 24c extending therebetween, and the projection onto the one surface 24a is projected onto the one surface 24a of the female mold 24. A groove 26 corresponding to the protrusion 25 of the male mold 23 is provided.
The groove 26 is connected to one end of the first groove portion 26a corresponding to the first protrusion portion 25a, the second groove portion 26b corresponding to the second protrusion portion 25b, The third groove portion 26c is connected to the other end of the first groove portion 26a and corresponds to the third protrusion portion 25c.

The first groove portion 26a forms a portion near the apex of the U-shape and is curved in an arch shape in which the projection onto the surface orthogonal to the U-shaped axis is convex upward, although not shown. Yes.
Although not shown, after the second and third groove portions 26b and 26c gradually reach their deepest points in the length direction from the connection position with the first groove portion 26a, they reach the deepest point. , Is formed so that the depth gradually decreases.
Although not shown, the second and third groove portions 26 b and 26 c further extend in a C shape from the one surface 24 a of the female mold 24 when viewed in the axial direction of the U shape of the groove 26.

Although not shown, the distal end surface of the second groove portion 26b has a wire fixing hole having a diameter corresponding to the wire and extending from the distal end surface through the inside of the female die 24. Yes.
Furthermore, the tip of the third groove portion 26c opens to the side surface 24c of the female mold 24, and the side surface 24c is provided with an extension portion 27 having a peripheral surface connected to the bottom surface of the third groove portion 26c. . The peripheral surface of the extended portion 27 is curved so as to protrude downward from the third groove portion 26c and in a direction in which the third groove portion 26c extends.

The device further comprises a vise 20.
The dovetail grooves opened on the upper end surfaces of the blocks 21 and 22 that are connected to the opposing surfaces 21a and 22a of the fixed block 21 and the movable block 22 of the vise 20 and that extend in the opposite directions to each other. 21b and 22b are formed.
On the other hand, ant tenons 28 and 29 that are paired with the dovetail grooves 21b and 22b are provided on the other surfaces 23b and 24b of the male mold 23 and the female mold 24, respectively.

Then, the ant tenon 28 of the female mold 24 is fitted into the ant groove 21b of the fixed block 21, and the ant tenon 29 of the male mold 23 is fitted into the ant groove 22b of the movable block 22, so that the male mold 23 and the female mold 24 are It is designed to be detachably attached to the vise.
In this case, it goes without saying that the male mold 23 can be attached to the fixed block 21 and the female mold 24 can be attached to the movable block 22.

  By making the male mold 23 and the female mold 24 detachable, different mold sets (male mold and female mold) can be easily exchanged for each type of tooth decay, and they can be accurately positioned on the fixed and movable blocks. Can be installed in the state.

  Then, after one end of the wire is inserted into the female wire fixing hole and the wire is set in the groove, the second groove portion and the second groove portion are pressed by being pressed by the male die and the female die. The wire portion located between the projecting portions is formed as a clasp point of the clasp, and the wire portion located between the first and third groove portions and the first and third projecting portions is used as the clasp arm portion of the clasp. As a fixed portion of the clasp, the wire portion that is molded and further bent in the pressed state extends from the third groove portion and the third projection portion to the outside along the peripheral surface of the extension portion 27 of the female die 24. Molded.

  Thus, according to the apparatus of the present invention, after setting the wire in the groove of the female mold, the wire is shaped into a predetermined shape by simply pressing the male mold and the corresponding male mold with each other using a press mechanism. By molding, the same clasp that can be produced using the method according to the invention can be produced easily.

  The configuration of the present invention has been described based on one preferred embodiment. However, the configuration of the present invention is not limited to the above embodiment, and various modifications may be made within the scope of the matters described in the claims. It goes without saying that can be created.

For example, in the above apparatus, the uneven shape of the male protrusion and the uneven shape of the female groove can be replaced with each other. In this case, the male protrusion forms a portion near the apex of the U-shape, and the first projection curved in an arch shape in which the projection onto the surface orthogonal to the U-axis is convex upward. After connecting to both ends of the projecting portion and the first projecting portion, the height gradually decreases from the connecting position with the first projecting portion in the length direction, and reaches a predetermined lowest point, The second and third projecting portions are formed so that the height gradually increases, and the second and third projecting portions are reversely shaped from one side of the male mold when viewed on the U-shaped shaft. It extends in a shape.
On the other hand, the female groove forms a portion near the top of the U-shape, and the first groove portion curved in an arch shape in which the projection onto the surface orthogonal to the U-shaped axis is concave upward Then, after connecting to both ends of the first groove portion and extending from now on, the depth gradually decreases from the connecting position with the first groove portion in the length direction and reaches the shallowest point, and then the depth gradually increases. The second and third groove portions are formed in an inverted C shape from the female surface 24a when viewed in the axial direction of the U-shape of the groove. It stretches.

  Further, in the above apparatus, the means for pressing the male and female dies against each other is not limited to a vise, and the male and female dies are attached with the surfaces facing each other. Any known press mechanism that moves between a separated position where they are separated from each other and a press position where they are in close contact with each other may be provided.

DESCRIPTION OF SYMBOLS 1 Wire clasp 2 Valley 3 1st peak 4 2nd peak 5 Extension part 6 Extension part 7 Valley peak 8 Peak 1 peak 9 Peak 2 peak 10 Wire 11 Suture 12 Buccal side 13 Fixed part 14 arm part 15 cusp part 20 vise 21 fixed block 21a face 21b facing the movable block dovetail groove 22 movable block 22a face 22b facing the fixed block dovetail groove 23 male mold 23a one face 23b other face 23c side face 24 female mold 24a One surface 24b Other surface 24c Side surface 25 Protrusion 25a First protrusion portion 25b Second protrusion portion 25c Third protrusion portion 26 Groove 26a First groove portion 26b Second groove portion 26c Third groove portion 27 Expansion portion a first mountain outer edge b first mountain-to-valley boundary c second mountain-to-valley boundary d second mountain outer end e first predetermined position f second predetermined position g second Maximum point h of 2 protrusions The highest point i of the third projection part i The connection position j between the first projection part and the second projection part j The connection position s between the first projection part and the third projection part s Interdental distance

Claims (4)

A wire clasp provided in a denture base of a partial denture serving as a substitute for a missing tooth and supporting and fixing the denture base to the tooth by engaging with a tooth adjacent to the partial denture, A fixed portion embedded in the floor and integrated with the denture base; connected to the fixed portion and extending from the fixed portion; and on the outer side of the undercut of the cheek side surface or the lip side surface or the lingual side surface of the tooth decay In a method of manufacturing a brachial arm portion disposed so as to surround teeth, and a cusp portion connected to the distal end of the brachial arm portion, extending from the brachial arm portion, and engaging with the undercut. ,
(1) A wave shape having a predetermined length of wire on a plane, having U-shaped valleys and inverted U-shaped first and second peaks connected to both sides of the valleys. The valley and the first and second peaks have substantially the same curvature, and the valley is curved into a shape corresponding to the undercut,
(2) The portion of the trough of the wire curved into the wave shape is curved in an arch shape on one side of the plane, and each of the first and second crest portions is near the boundary with the trough. As a base point, a predetermined acute angle twist is made around the base point so that the portions extending outward from the vertices of the first and second peaks are respectively directed to the outside of the arch surface formed by the valley portion, By cutting the wire at a first predetermined position across the top of the first mountain to the opposite side of the trough, the remaining portion of the first mountain is used as the crest of the clasp, The portion from the valley to the second predetermined position beyond the top of the second mountain is the arm portion of the clasp,
(3) A method of further curving a portion extending outward from the second predetermined position to form the fixing portion of the clasp. A wire clasp provided in a denture base of a partial denture serving as a substitute for a missing tooth and supporting and fixing the denture base to the tooth by engaging with a tooth adjacent to the partial denture, A fixed portion embedded in the floor and integrated with the denture base; connected to the fixed portion and extending from the fixed portion; and on the outer side of the undercut of the cheek side surface or the lip side surface or the lingual side surface of the tooth decay An apparatus for manufacturing a brachial arm portion disposed so as to surround teeth, and a cusp portion connected to a distal end of the brachial arm portion, extending from the brachial arm portion, and engaging with the undercut. There,
With male and female molds that are paired with each other,
The male mold is composed of one surface parallel to each other and the other surface, and a side surface extending between them. The projection on the one surface of the male mold is U-shaped and corresponds to the diameter of the wire. A protrusion having an upper end surface with a width to be
The protrusion is
Forming a portion near the apex of the U-shape, and a first projection portion curved in an arch shape in which a projection onto a surface orthogonal to the U-shaped axis is concave or convex upward;
When the first projection portion is connected to both ends of the first projection portion and extends from the first projection portion, and the first projection portion is curved in the shape of the concave arch, the first projection portion is The arch is formed such that the height gradually increases from the connection position in the length direction and reaches a predetermined maximum point, and then the height gradually decreases. In the case of curved in a shape, the height gradually decreases in the length direction from the connection position with the first projecting portion and reaches a predetermined lowest point, and then the height gradually increases. Second and third protruding portions, and
The second and third projecting portions, when the first projecting portion is curved in an arch shape that becomes the concave, have a C shape from the one surface of the male when viewed in the axial direction of the U-shape. However, when the first projecting portion is curved in the concave arch shape, when viewed in the axial direction of the U-shape, it extends in an inverted C shape from the one surface of the male type,
The female mold is composed of one surface parallel to each other and the other surface, and a side surface extending between them, and the projection on the one surface is U-shaped on one surface of the female mold, A groove corresponding to the protrusion is provided,
The groove is connected to one end of the first groove portion corresponding to the first protrusion portion, a second groove portion corresponding to the second protrusion portion, and the first groove portion. A third groove portion connected to the other end of the first groove portion and corresponding to the third protrusion portion;
The first groove portion forms a portion near the top of the U-shaped curve, and the projection onto a plane orthogonal to the U-shaped axis is curved in an arch shape that is upwardly convex or concave,
Each of the second and third groove portions has a depth in a length direction from a connection position with the first groove portion when the first groove portion is curved in the convex arch shape. The depth is gradually increased and reaches the deepest point, and then the depth is gradually decreased. However, when the first groove portion curves in the concave arch shape, the first groove portion is formed. After the depth gradually decreases in the length direction from the connection position with the groove portion and reaches the shallowest point, the depth is gradually increased,
When the first and second groove portions are curved in the shape of the convex arch, the second and third groove portions have a C shape from the one surface of the female mold when viewed in the axial direction of the U shape. However, when the first groove portion is curved into the concave arch shape, when viewed in the axial direction of the U-shape, it extends from the one surface of the female mold in a reverse C-shape,
A wire fixing hole having a diameter corresponding to the wire and extending from the tip surface through the inside of the female mold is provided on the distal end surface of the second groove portion, and the third groove The tip of the part opens on the side of the female mold,
The male mold and the female mold are attached with the surfaces facing each other, the male mold and the female mold are separated from each other, and the male mold and the female mold are separated from each other; A press mechanism for moving the female mold between press positions in close contact with each other;
One end of the wire is inserted into the wire fixing hole of the female mold, and the second groove portion is pressed by the male mold and the female mold after the wire is set in the groove. And a wire portion located between the second projecting portions is formed as the cusp portion of the clasp and is located between the first and third groove portions and the first and third projecting portions. A wire portion is formed as the arm portion of the clasp, and a wire portion extending outward from the third groove portion and the third protrusion portion is formed as the fixing portion of the clasp. A device characterized by.   The press mechanism is composed of a vise, and one of the male mold and the female mold is attached to one of the opposed surfaces of the fixed block and the movable block of the vise, and the other of the opposed surfaces of the vise 3. The apparatus of claim 2, wherein the other of the male mold and the female mold is attached.   On the opposing surfaces of the fixed block and the movable block of the vise, dovetail grooves extending in the vertical direction and opened on the upper end surface of the block related to the upper end are formed at positions facing each other, and On the other surface of each of the male mold and the female mold, ant tenons that are paired with the dovetail groove are provided. The male mold and the female mold ant tenons are provided with the fixed block and the movable block. The apparatus according to claim 3, wherein the male mold and the female mold are attached to the fixed block and the movable block by being fitted into a dovetail groove.