JPH10127663A - Magnet structure for denture attachment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnet structure for a denture attachment which is small in size and prevents the dislodgment of the attachment by stably holding the same in a dental plate without decreasing magnetic attraction force. SOLUTION: This denture attachment is implanted into the dental plate so as to face a keeper fixed to the dental root and is attracted to this keeper by magnetic attraction force. The denture attachment described above consists of a pair of yokes 11 which have the one-side flanks parallel with a thickness direction functioning as attraction surface to be magnetically attracted to the keeper and consist of soft magnetic materials and a magnet 10 which is pressed and fixed to the yokes 11 in superposition thereof respectively in their thickness direction so as to be held by the yokes 11, have the N-S poles extending in the thickness direction and have a corrosion resistant nonmagnetic film on its lateral surface. A projecting part 23 is joined to the outer peripheral surfaces of the yokes 11 and the flank of this magnet 10 having the corrosion resistant nonmagnetic film so that the projecting part 2 is sealed into the dental plate and is mechanically engaged therewith when the denture attachment is embedded into the dental plate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnet structure for a denture attachment capable of stably holding a denture on a root plate with magnetic attraction.

[0002]

2. Description of the Related Art As a conventional denture attachment, Japanese Patent Application Laid-Open No. 8-150156 discloses a denture attachment 100 proposed by the present applicant. As shown in FIG. 8, the denture attachment 100 includes a case 102 made of a corrosion-resistant non-magnetic alloy covered with a magnet structure 101 that is attracted to a root plate and a cover surface excluding a suction surface 113 of the magnet structure 101 on the root plate side. And a protrusion 103 joined to the side surface of the case 102. Further, the magnet structure 1
01 is a plate-like magnet 1 having magnetic poles parallel to the attracting surface 113
10, yokes 111, 111 of a soft magnetic material sandwiching the magnet 110 from both pole sides, and a spacer 112 made of a corrosion-resistant nonmagnetic alloy that covers the surface of the magnet 110 on the attraction surface 113 side and is isolated from the external environment.

[0003] As shown in FIG. 9, when the denture attachment 100 is buried in a cavity inside a denture base 105 in which artificial teeth 104 are planted, the projection 103 has a denture base 105.
The denture attachment 100 is fixed inside the denture base 105 by being mechanically engaged and sealed inside.

[0004]

However, the conventional magnet structure for an attachment for a denture has the following problems. That is, as described above, the denture attachment 100 disclosed in Japanese Patent Application Laid-Open No. 8-150156 has a magnet structure 101 that is attracted to a root plate and a magnet plate 101 side of the magnet structure 101 shown in FIG. Adsorption surface 11
Case 10 made of a corrosion-resistant non-magnetic alloy covered except for 3
2 and a projection 103 joined to the side surface of the case 102 to prevent the denture attachment 100 embedded in the denture base 106 from falling off. However, since the yokes 111 and 111 made of a corrosion-resistant soft magnetic material are further covered by a case 102 made of a corrosion-resistant non-magnetic material, unnecessary seals are provided on the yokes 111 and 111 and the yokes 111 and 111 are overlaid thereon. Since the projections 104 are joined, the denture attachment 100 is enlarged. Further, the conventional method of joining the protrusion to the side surface of the case cannot be applied to a magnet structure in which the case is covered only on the side peripheral surface of the magnet.

SUMMARY OF THE INVENTION In view of the above problems, the present invention is to provide a magnet structure for a denture attachment which is small, stably held in a denture base without reducing magnetic attraction, and prevents falling off. It is assumed that.

[0006]

According to the present invention, there is provided a denture attachment which is implanted in a denture base so as to face a keeper fixed to a root and is attracted to the keeper by magnetic attraction. A pair of yokes made of a soft magnetic material, one side surface of which is parallel to the thickness direction serving as an attraction surface for magnetically attracting the keeper, and each of the yokes are overlapped in the thickness direction so as to be sandwiched between the yokes. A magnet having an NS pole extending in the thickness direction and having a corrosion-resistant non-magnetic coating on the side surface thereof, the projection being formed on the outer peripheral surface of the yoke and the side surface of the corrosion-resistant non-magnetic coating of the magnet. The denture attachment is embedded in the denture base, the protrusion is sealed in the denture base and mechanically engages the denture attachment magnet structure, Ah .

That is, in the present invention, the case is covered over the entire magnet structure except for the attracting surface that magnetically attracts the keeper, and the projection is joined to the side surface of the case. In other words, a magnet with a film on the side peripheral surface,
A magnet structure for a denture attachment, comprising a pair of yokes arranged in contact with both side surfaces in the thickness direction of the magnet, wherein a protrusion is joined to a side surface of the magnet structure.
Further, the protrusion can be joined only to the side surface of the yoke.

[0008] The magnet is composed of a magnet material and a coating covering the side peripheral surface of the magnet material. As the magnet material, for example, it is preferable to use a rare earth magnet having a maximum energy product of 20 MGOe or more. Such magnets include Sm ₂ Co ₁₇ sintered magnets, Sm-Co based sintered magnets,
There are Nd-Fe-B based sintered magnets and the like.

As the corrosion-resistant non-magnetic material used for the coating covering the side peripheral surface of the magnet, for example, SUS
316, 316L, Ti alloy, pure Ti, dental alloy Pd-Co-Ni alloy, gold alloy, gold-palladium alloy, and the like. They have particularly good corrosion resistance in the human mouth.

[0010] The yoke has an inclined surface which is inclined outwardly from an upper portion of a side surface which does not face the keeper,
The corrosion-resistant soft magnetic material of the yoke is 19Cr-2M.
o-Ti steel, 13Cr-2Mo-Ti steel, 15Cr-2
There are Mo-Ti steel, 17Cr-2Mo-Ti steel, pure iron, and the like.

The yokes on both sides and the coating are joined to each other at the outer peripheral portions of the contact surfaces. Such joining means include, for example, laser welding, electron beam welding, and brazing. In particular, in the former two cases, the outer periphery of the contact surface between the yoke and the film can be joined in a fine line shape, and a joint having less unevenness can be formed.

The protruding portion is made of a corrosion-resistant non-magnetic material, for example, SUS316 / 316L, Ti alloy, pure Ti, or dental alloy Pd-Co-Ni alloy, gold alloy, gold-palladium alloy and the like.

The above description has been made on the case where the projection is joined to the side surface of the yoke to prevent the force from being released. It is also possible to prevent the attachment from becoming weak. That is, according to the present invention, in a denture attachment that is implanted in a denture base so as to face a keeper fixed to a root and is attracted to the keeper by a magnetic attraction force, the denture attachment is one that is parallel to the thickness direction. A pair of yokes made of a soft magnetic material, the side surfaces of which serve as an attracting surface for magnetically attracting the keeper, are abutted and fixed on the yokes so as to be sandwiched between the yokes in the thickness direction. A magnet structure for a denture attachment, comprising a magnet having an N-S pole extending in a direction and a corrosion-resistant non-magnetic coating on a side surface thereof, and having irregularities provided on a side surface of the yoke.

The shape of the unevenness provided on the side surface of the yoke includes a band-shaped concave portion, a band-shaped convex portion, and a wavy uneven portion.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described specifically with reference to examples. (Embodiment 1) As a magnet structure 1 for a denture attachment as an embodiment of the present invention, as shown in FIG. 1, a magnet 10 having a corrosion-resistant non-magnetic coating on a side peripheral surface, as shown in FIG. On both sides, a pair of yokes 11 made of a corrosion-resistant soft magnetic material,
11, the magnet 10 and the yokes 11, 11, and a projection 2 having irregularities is joined to a part of the outer peripheral surface of the magnet structure 1. The details will be described below.

The above-described magnet structure 1 for attachment to a denture
Is a plate-shaped magnet 10 having NS poles extending in the thickness direction, and a pair of yokes 11, 11 made of a corrosion-resistant soft magnetic material disposed on both sides of the magnet 10 in contact with each other. The yoke 11 was integrated by welding. In the magnet structure 1, the yokes 11, 11 guide the magnetic flux coming out of the magnet 10, so that
Exhibits relatively strong magnetic attraction.

As shown in FIG. 1, the magnet 10 has a coating 10b of a corrosion-resistant non-magnetic material on a side peripheral surface of a magnet material 10a. A pair of yokes 11, 11 made of a corrosion-resistant soft magnetic material are disposed in contact with both sides in the thickness direction of the magnet 10,
The outer peripheral portion of the contact was welded by laser or electron beam. Therefore, although the magnet material 10a is relatively easily corroded in the mouth, its entire peripheral surface is covered with the film 10b and the yoke 1
Since it is completely surrounded by 1 and 11 and sealed by welding, there is no danger that the magnet material will be corroded by the invasion of saliva or the like.

The coating 10b is provided only on the magnet material 10a and is not provided on the outer periphery of the yokes 11,11. Therefore, the thickness of the denture attachment in the thickness direction can be reduced as compared with the conventional example.

As shown in FIGS. 1 and 2, each of the yokes 11 and 11 has an inclined surface 11a descending outward at its upper end. The inclined surface 11a is provided for the yoke 11,
At 11, on the shoulder at the upper end that does not face the keeper,
It is provided so as to descend outward. The descending angle of the inclined surface 11a is about 30 degrees.

The projection 2 has a C-shaped cross section having an upper peripheral surface of the magnet structure 1 and an inner peripheral surface to be molded.
It is formed by raising its outer peripheral edge at a right angle. The protrusion 2 and the magnet structure 1 are firmly joined by laser welding. As a result of measurement using a tensile tester, the tensile force required to pull out the denture attachment using the present example from the denture base was 22 kgf.

The material and dimensions of each part of the magnet structure 1 in this embodiment will be described. The material of the magnet 10 is such that the magnet material 10a is made of a sintered Nd-Fe-B magnet, and the coating 10b is made of SUS316L. Also,
The dimensions are as follows: the height of the magnet material 10a is 1.6 mm, the width is 3.6 mm, and the thickness is 1.0 mm.
3.8mm wide, 1.0mm thick, 0.1m thick
m. The yokes 11, 11 are made of 19Cr-2Mo-Ti steel made of a corrosion-resistant soft magnetic material, and have dimensions of a maximum height of 1.8 mm, a shoulder height of 1.4 mm,
The width is 3.8 mm and the thickness is 0.9 mm. The maximum height is the height of the yoke, and the shoulder height is the height of the inclined surface 1.
It is the height to the lower end of 1a. The protrusion 2 is made of SUS
316L, height 1.1mm, width 4.4m
m, a thin plate having a thickness of 3.0 mm was constructed so as to have an upper peripheral surface of the magnet structure 1 and an inner peripheral surface of a mold object.

(Embodiment 2) A magnet structure for a denture attachment according to an embodiment of the present invention will be described with reference to FIG. As shown in FIG. 3, in the magnet structure 1 in this example, a thin plate-like projection 2 was joined to the side surface (the surface that does not stick to the keeper) of the magnet 10 and the yokes 11 and 11. As a result of measurement with a tensile tester, the tensile force for pulling out the denture attachment using the present example from the denture base was 15 kgf.

The material and dimensions of each component of the magnet structure in this embodiment will be described. The material of the magnet 10 is such that the magnet material 10a is made of an Sm-Co based sintered magnet, and the film 11b is made of a Ti alloy. The dimensions are
The height of the magnet material 10a is 1.3 mm and the width is 2.6 m
m, the thickness is 0.8 mm, and the film 10b has a width of 2.
The thickness is 8 mm, the thickness is 0.8 mm, and the thickness is 0.1 mm.
The yokes 11, 11 are made of a corrosion-resistant soft magnetic material.
It uses Cr-2Mo-Ti steel and its dimensions are a maximum height of 1.5 mm, a shoulder height of 1.2 mm, and a width of 2.8.
mm and the thickness is 0.8 mm. The protrusion 2 is made of Ti
It is made of an alloy and has a length of 2.4 mm, a width of 2.0 mm, and a thickness of 0.2 mm. Others are the same as the first embodiment.

(Embodiment 3) A magnet structure for a denture attachment according to an embodiment of the present invention will be described with reference to FIG. The magnet structure 1 according to the present embodiment includes yokes 11 and 1.
A band-shaped convex protrusion 2 was joined to the upper part of the side surface which is vertically descending from the inclined surface 11a. As a result of measurement using a tensile tester, the tensile force required to pull out the denture attachment using this example from the denture base was 18 kgf.

The material and dimensions of each component of the magnet structure in this embodiment will be described. The material of the magnet 10 is such that the magnet material 10a is made of an Nd-Fe-B based sintered magnet, and the coating 10b is made of a Pd-Co-Ni alloy.
The dimensions are as follows: the height of the magnet material 10a is 1.9 mm,
The width is 4.1 mm, the thickness is 1.2 mm, and the film 10b
Has a width of 4.2 mm, a thickness of 1.2 mm, and a thickness of 0.0
5 mm. The yokes 11 and 11 are made of 19Cr-2Mo-Ti steel made of a corrosion-resistant soft magnetic material, and have a maximum height of 2.0 mm and a shoulder height of 1.6 m.
m, the width is 4.2 mm, and the thickness is 1.0 mm. The protrusion 2 is made of a Pd-Co-Ni alloy and has a length of 2.
0 mm, width 0.2 mm, thickness 0.2 mm. Others are the same as the first embodiment.

Hereinafter, an embodiment in which irregularities are provided directly on the side surface of the yoke to prevent the denture attachment from falling off will be described with reference to FIGS. (Fourth Embodiment) As shown in FIG. 5, a magnet structure 1 for a denture attachment according to a fourth embodiment of the present invention includes a magnet 10 having a corrosion-resistant non-magnetic coating on a side peripheral surface, and both side surfaces of the magnet 10. And a pair of yokes 11, 11 made of a corrosion-resistant non-magnetic material.

As shown in FIG. 5, the yokes 11, 11 have an inclined surface 11a which descends outward at the upper end thereof, and a side surface 11 which descends vertically from the inclined surface 11a.
b. Irregularities 11c were provided on the upper part. The inclined surface 11a is provided on the yoke 11, 11 at the shoulder at the upper end that does not face the keeper so as to descend outward. The descending angle of the inclined surface 11a is about 30 degrees. The irregularities 11c
Is bent at a right angle from a point 0.2 mm below the inclined surface 11a to prevent the denture attachment from dropping out of the denture base. As a result of measurement using a tensile tester, the tensile force required to pull out the denture attachment using this example from the denture base was 20 kgf.

The material and dimensions of each component of the magnet structure in this embodiment will be described. The material of the magnet 10 is such that the magnet material 10a is made of an Nd-Fe-B based sintered magnet, and the film 10b is made of SUS316L. Also,
The dimensions are as follows: the height of the magnet material 10a is 1.6 mm, the width is 3.6 mm, and the thickness is 1.0 mm.
3.8mm wide, 1.0mm thick, 0.1m thick
m. The yokes 11, 11 are made of 19Cr-2Mo-Ti steel made of a corrosion-resistant soft magnetic material, and have dimensions of a maximum height of 1.8 mm, a shoulder height of 1.4 mm,
The width was 3.8 mm, the thickness was 0.9 mm, and irregularities were provided from the lower end of the inclined surface 11a.

(Embodiment 5) A magnet structure for a denture attachment according to an embodiment of the present invention will be described with reference to FIG.
As shown in FIG. 6, the yokes 11, 11 have an inclined surface 11 a descending outward at the upper end thereof, and an inclined surface 11 a.
A side surface 11b descending vertically from a and an inclined surface 11a 'descending inward from the lower end of the side surface 11b are provided. As a result of measurement using a tensile tester, the tensile force required to pull out the denture attachment using this embodiment from the denture base was 15%.
kgf.

The material and dimensions of each component of the magnet structure in this embodiment will be described. The material of the magnet 10 is such that the magnet material 10a is a Sm-Co based sintered magnet,
The coating 10b is made of a gold alloy. The dimensions are as follows: the height of the magnet material 10a is 1.6 mm, the width is 3.6 mm, the thickness is 1.0 mm, and the coating 10b has a width of 3.8 mm.
The thickness is 1.0 mm and the thickness is 0.1 mm. The yokes 11, 11 are made of 17Cr-2 made of a corrosion-resistant soft magnetic material.
Mo-Ti steel is used, and its dimensions are 1.8
mm, width 3.8 mm, thickness 0.9 mm. The downward angle of the inclined surface 11a descending outward is about 45 degrees.
Degrees, the descending angle of the inclined surface 11a 'descending inward is about 1
0 degrees. Others are the same as the fourth embodiment.

Embodiment 6 A magnet structure for a denture attachment according to an embodiment of the present invention will be described with reference to FIG. As shown in FIG. 7, the yokes 11, 11 each have an inclined surface 11 a descending outward at an upper end thereof, and a concave-convex side surface 1 vertically descending from the inclined surface 11 a by 0.1 mm in a wave shape.
1b. As a result of measurement with a tensile tester, the tensile force required to pull out the denture attachment using this example from the denture base was 13 kgf.

The material and dimensions of each component of the magnet structure in this embodiment will be described. The material of the magnet 10 is such that the magnet material 10a is made of an Nd-Fe-B based sintered magnet, and the film 10b is made of SUS316L. Also,
The dimensions are as follows: the height of the magnet material 10a is 1.0 mm, the width is 2.6 mm, and the thickness is 0.8 mm.
2.8mm width, 0.8mm thickness, 0.1mm wall thickness
It is. The yokes 11, 11 are made of 13Cr-2Mo-Ti steel made of a corrosion-resistant soft magnetic material, and have dimensions of a height of 1.2 mm, a width of 2.8 mm, and a thickness of 0.8.
mm. Others are the same as the fourth embodiment.

[0033]

As described above, according to the present invention, there is provided a magnet structure for a denture attachment which is small in size, can be stably held in a denture base without reducing magnetic attraction, and is prevented from falling off. can do.

[Brief description of the drawings]

FIG. 1 is a sectional view of a magnet structure according to a first embodiment.

FIG. 2 is a perspective view of the magnet structure according to the first embodiment.

FIG. 3 is a sectional view of a magnet structure according to a second embodiment.

FIG. 4 is a sectional view of a magnet structure according to a third embodiment.

FIG. 5 is a sectional view of a magnet structure according to a fourth embodiment.

FIG. 6 is a sectional view of a magnet structure according to a fifth embodiment.

FIG. 7 is a sectional view of a magnet structure according to a sixth embodiment.

FIG. 8 is a sectional view of a magnetic attachment for a denture in a conventional example.

FIG. 9 is a cross-sectional view showing a mounted state of a conventional magnetic attachment for a denture.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Magnet structure 2 ... Projection part 10 ... Magnet 10a ... Magnet material 10b ... Film 11 ... Yoke 11a, 11a '... Inclined surface 11b ... Side surface 11c ... Uneven side surfaces

 ──────────────────────────────────────────────────の Continuing from the front page (72) Inventor Kenji Hiranuma 44-4, No.5 in front of Ueda Pagoda, Tenpaku-cho, Tenpaku-ku, Nagoya City, Aichi Prefecture

Claims (3)

[Claims] 1. A denture attachment that is implanted in a denture base so as to face a keeper fixed to a root and is attracted to the keeper by magnetic attraction, wherein the denture attachment is one side parallel to a thickness direction. And a pair of yokes made of a soft magnetic material, which serve as an attracting surface for magnetically attracting the keeper, and are fixedly abutted on the yokes in the thickness direction so as to be sandwiched between the yokes. The NS pole extends,
A magnet having a corrosion-resistant non-magnetic coating on its side peripheral surface, and a projection is joined to the outer peripheral surface of the yoke and a side surface of the corrosion-resistant non-magnetic coating of the magnet, and the denture attachment is embedded in the denture base. The protruding portion is sealed in a denture base and mechanically engaged with the denture base, wherein the magnet structure for denture attachment is characterized in that: 2. The magnet structure for denture attachment according to claim 1, wherein said projection is joined to a side surface of said yoke. 3. A denture attachment that is implanted in a denture base so as to face a keeper that is fixed to a root and that is attracted to the keeper by magnetic attraction, wherein the denture attachment is parallel to the thickness direction. A pair of yokes made of a soft magnetic material, one side of which serves as an attracting surface for magnetically attracting the keeper; and NS pole extends in the direction
A magnet structure for a denture attachment, comprising: a magnet having a corrosion-resistant non-magnetic film on a side peripheral surface thereof;