JP3586969B2 - Thin denture attachment - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a thin denture attachment that can stably hold a denture with respect to a keeper and that is thin.
[0002]
[Prior art]
Conventionally, as a denture utilizing magnetic attraction, for example, those shown in FIGS. 19 and 20 have been proposed.
As shown in FIG. 19, the denture 90 has a root plate 930 embedded in a root portion 92 in an alveolus 91, a keeper 93 embedded therein, and an enamel denture portion 95 made of enamel so as to face the root plate. Things.
[0003]
The denture portion 95 has a denture base 94 made of plastics or the like below the denture base 94, and has a denture attachment 8 in a position facing the keeper 93 in the denture base 94. In FIG. 19, reference numeral 96 denotes gingiva, and 99 denotes an anti-bite in the upper jaw.
[0004]
Next, as shown in FIG. 20, the denture attachment 8 is provided with a thick plate-shaped magnet layer 81 which is disposed at the center and has NS poles extending vertically, and caps on the upper surface and side peripheral surfaces of the magnet layer 81. And a cap yoke 82 made of a corrosion-resistant soft magnetic material arranged in a shape. At the bottom of the magnet layer 81, a disk yoke 83 made of a corrosion-resistant soft magnetic material is arranged. A shield ring 85 made of a non-magnetic material is provided between the disk yoke 83 and the cap yoke 82. These are integrally fixed by welding.
[0005]
[Problems to be solved by the invention]
By the way, since the denture attachment 8 is arranged in the small denture base 94 and facing the keeper 93, it is desired to be as thin as possible. For this reason, in the denture attachment, even if only a very small dimension such as 0.1 to 0.3 mm is reduced, it is very useful for successfully installing the denture.
[0006]
That is, the conventional denture attachment 8 has a height of about 1.5 mm, and the total height of the keeper 93 and the denture attachment 8 is about 2.5 mm.
In addition, as shown in FIG. 21, the denture 90 needs to consider the biting state with the opposite bite (upper tooth) 99. Therefore, there is a method to delete part of the anti-bite, but it is not possible to sharpen it too much.
[0007]
Therefore, it is necessary to reduce the height of the denture 90 as much as possible. However, as shown in FIG. 22, the suction force between the denture attachment and the keeper becomes large unless the total height of the denture attachment and the keeper is increased. No. When the total height is 2.5 mm or more, the suction force is substantially constant.
[0008]
Therefore, in order to produce a denture attachment having a large suction force, the total height is required to be at least about 2.5 mm, which is the lower limit of the height at which a large suction force is obtained.
The keeper needs about 1 mm in order to secure a necessary suction force between the keeper and the denture attachment in the mouth.
[0009]
Therefore, as a countermeasure for satisfying the engagement between the upper and lower teeth and the above-mentioned suction force, the upper side of the root portion 92 is deleted, the alveolar space 91 is provided therein, and the root plate 930 is embedded therein. A method of disposing a keeper 93 thereon is adopted.
[0010]
However, the root portion 92 is located on the jawbone and is small. Further, since it is necessary to bury the root plate 930 in the root portion 92, it is necessary to completely remove the teeth 920 (see FIG. 5) in the root portion 92.
For this reason, in the past, in most cases, the denture attachment could be attached only to the edentulous teeth from which the teeth were removed.
[0011]
Therefore, when mounting a denture, it is desired to make the denture attachment as thin as possible.
In addition, the thickness reduction makes the root plate and its embedding process unnecessary, and also necessitates the removal of teeth, making the installation of dentures easier and further promoting the spread of dentures. You.
[0012]
SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a denture attachment that is thin and has high magnetic attraction.
[0013]
[Means for Solving the Problems]
The present invention relates to a denture attachment that is implanted in a denture base so as to face a keeper and that is attracted to the keeper by magnetic attraction.
The denture attachment includes a magnet layer and a yoke having an NS pole extending in a thickness direction facing the keeper, and a yoke.
The thin yoke attachment is characterized in that the yoke comprises a plurality of magnetic paths penetrating in the thickness direction of the magnet layer and a yoke back plate provided on the back of the magnet layer.
[0014]
It is most remarkable in the present invention that the denture attachment includes a magnet layer and a yoke whose NS poles extend in a thickness direction (a direction facing the keeper), and the yoke is a magnetic path portion and a yoke penetrating the magnet layer. It consists of a back plate.
[0015]
The magnetic path portion may be a plurality of parallel plate walls crossing the magnet layer.
The magnetic path may be a lattice wall that partitions the magnet layer into a polygon such as a triangle, a quadrangle, or a hexagon, or a circle such as a perfect circle or an ellipse.
The magnetic path may be a columnar body.
[0016]
The thickness of the magnet layer is preferably from 0.01 to 1 mm. If it is less than 0.01 mm, minute irregularities on the suction surface of the denture attachment and the suction surface of the keeper become air gaps in the magnetic path formed by the magnet layer, the yoke, and the keeper, and the air gap makes the magnetic circuit incomplete. There is a possibility that the suction power may not be sufficient. On the other hand, if it exceeds 1 mm, the overall height becomes large, and the volume of the attachment occupying the denture becomes large, so that there is a possibility that the attachment cannot be used for myelinated teeth.
It is preferable that the yoke has a fixing auxiliary portion formed of a projection or a rough surface on an outer peripheral portion. Thereby, the denture attachment can be securely fixed to the denture base.
[0017]
It is preferable that a reinforcing plate is provided on the yoke back plate. Thereby, the strength of the denture attachment can be improved.
The reinforcing plate is preferably made of one or more of noble metals, titanium, titanium alloys, and ceramics. These are excellent in that they have corrosion resistance in the oral cavity and strength enough to withstand the load during occlusion.
[0018]
It is preferable that the denture attachment has a non-magnetic boundary portion between the magnet layer and the yoke in the attraction surface facing the keeper, and the other has a corrosion-resistant protective layer made of a soft magnetic material. Thereby, the corrosion resistance of the magnet layer can be further improved.
[0019]
The magnet layer is preferably any one of a rare earth magnet, a platinum-based magnet, and an alnico magnet. These have a large magnetic attraction force and constitute an excellent denture attachment.
It is particularly preferable to use a rare-earth magnet having a maximum energy product of, for example, 10 MGOe (Mega Gauss Oersted) or more, as the above-mentioned magnet layer. Thereby, a magnetic attraction force of about 500 g or more can be exhibited.
Examples of such a magnet layer include Sm ₂ Co ₁₇ , an Sm—Co alloy, and an Nd—Fe—B alloy.
[0020]
The yoke is preferably made of a corrosion-resistant soft magnetic material. In addition, as the corrosion-resistant soft magnetic material, a material having a saturation magnetic flux density of 13000 G or more and a magnetic permeability of 3000 or more is preferably used. Examples of the corrosion-resistant soft magnetic material of the yoke having such characteristics include 19Cr-2Mo-Ti steel, 13Cr-2Mo steel, 17Cr-2Mo steel, and pure iron.
[0021]
It is preferable to provide a side plate outside the magnet layer. Thereby, corrosion resistance and magnetic efficiency can be improved.
The side plate is preferably made of the same material as the yoke.
[0022]
The magnet layer is preferably formed by any one of a vapor deposition method, a sputtering method, an ion plating method, a CVD method, a thermal spraying method, and a plating method. Thereby, the magnet layer can be arbitrarily formed to a desired thickness and width.
Also, a corrosion-resistant soft magnetic material is used as the keeper. As the corrosion-resistant soft magnetic material, for example, the same material as that of the yoke is used.
[0023]
Further, the interval between adjacent magnetic path portions, that is, the width of the magnet layer is preferably set to 0.01 to 1 mm. If it is less than 0.01 mm, the number of magnetic fluxes decreases and the attractive force decreases. On the other hand, if it exceeds 1 mm, the number of the magnetic cells may decrease, and the attraction force may decrease.
[0024]
Also, in order to further enhance the adhesion between the thin denture attachment and the keeper, the suction surface of the thin denture attachment facing the keeper is concave, and the suction surface of the keeper facing the thin denture attachment is convex. Can also be configured.
[0025]
Next, the operation of the present invention will be described.
The thin denture attachment of the present invention comprises a magnet layer having an NS pole formed in the thickness direction facing the keeper and a yoke, and the yoke extends through the magnet layer in the thickness direction. And a yoke back plate provided on the back of the magnet layer.
[0026]
For this reason, as shown in FIG. 6, the magnetic flux generated from the magnet layer forms a magnetic loop from the yoke back plate, through each magnetic path portion, through the attraction surface facing the keeper, and into the magnet layer again. The magnetic loop is formed by a plurality of magnetic paths.
[0027]
Therefore, a plurality of magnetic cells are formed, and the denture attachment and the keeper are strongly attracted by the attraction force of the plurality of magnetic cells. Therefore, a large magnetic attraction force can be obtained. Further, as the number of the magnetic cells increases, the magnetic attraction force per unit volume, which is obtained by dividing the attraction force of the denture attachment by the volume of the denture attachment, increases (FIG. 17).
Therefore, assuming that the area of the suction surface of the denture attachment is the same, the efficiency of the magnetic attraction force increases as the number of magnetic paths increases.
[0028]
In addition, since the magnetic attraction force can be increased by increasing the number of magnetic paths, the thickness of the magnet layer can be reduced.
Therefore, the magnet layer of the denture attachment can be made thin.
[0029]
Further, since the back surface and the outer surface of the magnet layer are surrounded by the yoke back plate and the side plate which are part of the yoke, the corrosion resistance of the magnet layer can be improved. The side plate also forms a magnetic loop similarly to the magnetic path.
[0030]
Therefore, according to the present invention, a denture attachment that is thin and has high magnetic attraction can be provided.
[0031]
BEST MODE FOR CARRYING OUT THE INVENTION
Example 1
A thin denture attachment according to an embodiment of the present invention will be described with reference to FIGS.
As shown in FIGS. 1 to 5, the denture attachment 1 of the present embodiment is implanted in a denture base 94 so as to face the keeper 3 joined to the root portion 92 with dental cement. The denture attachment 1 includes a large number of rectangular magnet layers 11 and yokes 2 whose NS poles extend in the thickness direction, which is the direction facing the keeper 3 (FIGS. 3 and 4).
[0032]
The yoke 2 includes a plurality of magnetic path portions 21 penetrating in the thickness direction of the magnet layer 11, a yoke back plate 22 provided on the back surface of the magnet layer 11, and a side plate covering the outer surface of the magnet layer 11. 23.
[0033]
This yoke is integrally formed of 19Cr-2Mo-Ti steel (SUS444) which is a corrosion-resistant soft magnetic material.
The magnetic path portion 21 is a lattice wall that partitions the magnet layer 11 into a rectangular lattice, and is exposed on the attraction surface 20 (FIGS. 2 and 4).
[0034]
In this example, the magnet layer 12 is made of a 200 μm square Pt—Co magnet and has a thickness of 100 μm. The magnetic path portion 21 of the yoke 2 has a width of 40 μm, and is provided with 10 in the horizontal width direction and 14 in the vertical width direction. In addition, there is a square recess of 200 μm on a side for inserting the magnet layer 12 therebetween. The depth of this recess is 100 μm. The number of magnetic cells in this example is 161.
[0035]
The yoke back plate 22 has a thickness of 30 μm and is provided on the entire back surface of the magnet layer 11. The side plate 23 has a thickness of 130 μm and a width of 220 μm. The width of the denture attachment is 4 mm, the length is 3 mm, and the thickness is 130 μm.
[0036]
The magnet layer 11 is formed by a sputtering method in a rectangular recess formed by the magnetic path portion 21 and the yoke back plate 22 and the side plate 23 in the yoke.
Further, the keeper 3 in the present example has a thickness of 50 μm and has the same area as the suction surface 20 of the denture attachment 1.
[0037]
The denture attachment 1 is installed in a denture bed 94. The keeper 3 is fixed above the root portion 92.
In this example, the suction force between the denture attachment 1 and the keeper 3 was 350 gf.
[0038]
Here, a method of measuring the suction force of the denture attachment will be described. The magnetic attraction force between the denture attachment 1 and the keeper 3 was measured using an Instron type tensile tester using a load cell capable of measuring up to 5 kgf. The measurement procedure is as follows.
[0039]
First, a denture attachment is attached to the lower surface of a 5 mm cubic hard rubber using a cyanoacrylate resin (commonly referred to as an instant adhesive). A nylon thread is attached to the center of the upper surface of the hard rubber, and the nylon thread is installed so as to be pulled upward.
[0040]
Then, the keeper side is fixed to the same tester table using soft magnetic material for keeper, and the nylon thread is pulled upward by a tensile tester in a state where it is magnetically attracted to the above-mentioned denture attachment. It was measured. In addition, the suction force shown in the Example described below is all measured by this method.
[0041]
Next, the operation and effect of this embodiment will be described.
As shown in FIG. 6, the magnetic flux generated from the magnet layer 11 enters each lattice-shaped magnetic path portion 21 from the yoke back plate 22 as shown by the arrow in FIG. To form a magnetic loop. At this time, the magnetic flux that has exited the attraction surface 20 enters the magnet layer 11 via the inside of the keeper 3. Therefore, magnetic attraction acts between the denture attachment 1 and the keeper 3, and both are attracted.
[0042]
The magnetic loop is formed in all the lattice-shaped magnetic path portions 21. As a result, 161 magnetic cells are formed, and the denture attachment 1 and the keeper 3 are firmly attracted to each other by the attractive force of the large number of magnetic cells. The magnetic loop is also formed on the side plate 23.
[0043]
As described above, according to the present embodiment, a denture attachment with a large attractive force can be obtained using a thin magnet layer of only 100 μm, which has never been considered in the past.
Further, since the back surface and the outer surface of the magnet layer 11 are surrounded by the yoke back plate 22 and the side plate 23 made of the above-described material, the corrosion resistance of the magnet layer 11 can be improved.
[0044]
Further, as described above, the denture attachment 1 of the present example has a thickness (magnet layer + yoke back plate) of only 130 μm and a thickness of the keeper 3 of only 50 μm.
Therefore, the total thickness of both is only 180 μm, which is about 20 times smaller than the conventional example (total thickness of 3500 μm), and is ultra-thin.
[0045]
Therefore, as shown in FIGS. 5A and 5B, when providing the keeper 3, it is not necessary to delete a large amount of the upper part of the root portion 92 unlike the conventional case (compare with FIG. 21).
Therefore, it is not necessary to remove the teeth 920 in the root portion 92.
Therefore, the processing work and the intraoral work for mounting the denture become extremely easy.
[0046]
Example 2
The denture attachment of this example has the lattice-shaped magnetic path shown in the first embodiment, and the entire denture attachment having a width of 4 mm, a length of 3 mm, and a thickness of 130 μm is subjected to a curved surface processing to a radius of curvature of 30 mm by pressing. It was done. This curved surface is processed so that the suction surface facing the keeper of the denture attachment is concave, and the facing keeper is processed into a convex surface with the same curvature so as to be in close contact with the keeper.
[0047]
As a result, also in this example, the magnetic attraction force between the denture attachment and the keeper was 350 gf as in Example 1. In the denture attachment of this embodiment, since the suction surface is a curved surface, there is an effect that the denture attachment and the keeper are hardly displaced by a force from the side.
[0048]
Example 3
As shown in FIGS. 7 to 10, the denture attachment 1 of this embodiment is provided with a large number of plate-wall-shaped magnetic path portions 210 crossing the magnet layer 12.
[0049]
The magnetic path sections 210 are arranged in 14 rows, and 15 elongated plate-shaped magnet layers 12 are defined by the magnetic path sections 210.
On the side surface of the side plate 23, as shown in FIG.
[0050]
Next, in the denture attachment 1, the magnet layer 12 is made of a Pt—Co magnet having a thickness of 100 μm, a width of 200 μm, and a length of 2.5 mm. Further, in the yoke 2, the magnetic path portion 210, the yoke back plate 22, and the side plate 23 are integrally formed of SUS444 of a corrosion-resistant soft magnetic material. The magnetic path section 210 has a thickness of 100 μm and a width of 50 μm.
[0051]
The yoke back plate 22 has a thickness of 30 μm and is provided on the entire back surface of the magnet layer 12. The side plate 23 has a thickness of 130 μm and a width of 220 μm. There are 14 magnetic path sections 210. Therefore, the number of magnetic cells is 15.
The width of the denture attachment 1 is 4 mm, the length is 3 mm, and the thickness is 130 μm.
Others are the same as the first embodiment.
[0052]
In this example, the suction force between the denture attachment 1 and the keeper 3 was 325 g.
Further, the denture attachment 1 of the present embodiment has the fixing auxiliary portion 29 on the side plate 23 of the yoke. Therefore, when the denture attachment 1 is implanted in the denture base 93, the fixation assisting portion 29 is fixed while being bitten into the denture base 93. Therefore, the denture attachment 1 can be firmly fixed to the denture base 93.
In this embodiment, the same effects as in the first embodiment can be obtained.
[0053]
Example 4
As shown in FIGS. 11 and 12, the artificial tooth attachment of this embodiment is provided with a honeycomb-shaped magnetic path portion 211 that partitions the magnet layer 13 into a hexagon.
In this example, the magnet layer 13 is composed of 6 columns × 9 rows, and a total of 54 magnet layers are formed. One magnet layer 13 has a hexagonal cross section having a side of 230 μm and is made of a 200 μm-thick Fe—Pt magnet. In the yoke 2, the magnetic path 211, the yoke back plate 22, and the side plate 23 (not shown) are integrally formed of a corrosion-resistant soft magnetic material SUS444, as in the second embodiment. The magnetic path section 21 has a thickness of 200 μm and a width of 70 μm.
[0054]
The yoke back plate 22 has a thickness of 70 μm and is provided on the entire back surface of the magnet layer 13. The side plate 23 has a thickness of 270 μm. The number of magnetic cells is 54.
Others are the same as the first embodiment.
In this example, the magnetic attraction between the denture attachment and the keeper was 560 gf.
In this embodiment, the same effects as in the first embodiment can be obtained.
[0055]
Example 5
As shown in FIG. 13, the denture attachment 1 of this example has a number of cylindrical magnetic path portions 25 provided between magnet layers 110.
In this example, the magnetic path section 25 has a diameter of 200 μm and a thickness of 80 μm. The interval between adjacent magnetic path portions 25 is 300 μm. Four magnetic path portions 25 are provided per 1 mm ² . Others are the same as the first embodiment.
In this embodiment, the same effects as in the first embodiment can be obtained.
[0056]
Example 6
As shown in FIG. 14, the denture attachment 1 of this embodiment is an example in which the reinforcing plate 4 is provided on the back surface of the yoke back plate 22 in the denture attachment having the lattice-shaped magnetic path shown in the first embodiment. The reinforcing plate 4 is joined to the yoke back plate 22 by laser beam welding.
The reinforcing plate 4 is made of titanium having a thickness of 160 μm. Others are the same as the second embodiment.
[0057]
According to this example, since the reinforcing plate 4 is provided on the yoke back plate, the strength of the denture attachment is improved. Further, it has the same effect as the first embodiment.
[0058]
Example 7
As shown in FIG. 15, the main part of the denture attachment 1 of this embodiment is an example in which a soft magnetic corrosion-resistant protective layer 45 is provided on the surface of the attraction surface 20 in the denture attachment of the first embodiment. A non-magnetic corrosion-resistant material 46 is provided on the corrosion-resistant protective layer 45 at a portion facing the periphery of the magnet layer 11.
[0059]
As the corrosion-resistant protective layer 45, a soft magnetic material of high corrosion-resistant ferritic stainless steel (SUS444) was used. The nonmagnetic corrosion-resistant material 46 was a modified material obtained by adding Ni and Cr to a high corrosion-resistant ferritic stainless steel (SUS444). It was obtained by vapor deposition on the top, partially melting by scanning with an excimer laser, and dissolving into the protective layer.
Others are the same as the first embodiment.
[0060]
In this embodiment, the above-described corrosion-resistant protective layer 45 and the non-magnetic corrosion-resistant material 46 are provided on the adsorption surface 20. Therefore, the corrosion resistance of the suction surface 20 can be improved.
Further, since the non-magnetic corrosion-resistant material 46 is provided on the portion of the corrosion-resistant protective layer 45 corresponding to the peripheral edge of the magnet layer 11, the attraction force is improved as compared with the case where this material is not provided.
[0061]
That is, by providing the corrosion-resistant protective layer 45, the corrosion resistance is improved, but on the other hand, there is a possibility that an air gap is generated and the suction force is slightly reduced. However, in the present embodiment, the non-magnetic corrosion-resistant material 46 is provided in the corresponding portion. Therefore, as shown in FIG. 15, a magnetic loop is formed in which all the magnetic flux goes to the keeper 3. Therefore, even if the corrosion-resistant protective layer 45 is provided, the suction force between the denture attachment 1 and the keeper 3 is high.
[0062]
Example 8
In the denture attachment 1 of this embodiment, as shown in FIG. 16, the magnetic path portion 213 of the yoke is provided so as to protrude from the lower surface of the magnet layer 11, and the corrosion-resistant protective layer 45 is formed around the lower end of the magnetic path portion 213. This is an example in which is provided. Further, a nonmagnetic corrosion-resistant material 46 is provided between the corrosion-resistant protective layer 45 and the outer periphery of the lower end of the magnetic path 213 so as to surround the lower end of the magnetic path 213.
[0063]
The materials of the corrosion-resistant protective layer 45 and the non-magnetic corrosion-resistant material 46 are the same as those in the fifth embodiment. Others are the same as the first embodiment.
In this embodiment, the same effect as that of the fifth embodiment can be obtained.
[0064]
Example 9
In this example, the relationship between the number of magnetic cells and the suction force per unit volume (FIG. 17) and the relationship between the total height of the denture attachment and the keeper and the suction force (FIG. 18) were measured.
[0065]
That is, the relationship between the magnetic cells and the attractive force per unit volume shown in FIG. 17 is different between the case where the lattice-shaped magnet layer 11 shown in the first embodiment is used and the number N of the magnetic cells is variously changed, and the denture. It was measured in relation to the suction force per unit volume (gf / mm ³ ) obtained by dividing the suction force of the attachment by its volume. The results are plotted on a logarithmic scale on the horizontal and vertical axes.
As is known from FIG. 17, it can be seen that the suction force per volume increases as the number N of magnetic cells increases.
[0066]
Next, the relationship between the total height of the denture attachment and the keeper and the suction force was measured when the thickness of the magnetic cell was varied in the denture attachment of Example 1.
[0067]
That is, as shown in FIG. 18, for example, the suction force when the total height is 3.5 mm and the number of magnetic cells (N) is 1 or the total height is 1/20 of 0.18 mm (attachment). The height was set to 0.13 mm, the keeper height was set to 0.05 mm), and the number of magnetic cells N was set to 161.
As a result, as shown in FIG. 18, even if the total height is reduced to 0.02 mm (the attachment height is 0.016 mm, the keeper height is 0.004 mm), it is understood that the suction force does not decrease.
[0068]
【The invention's effect】
As described above, according to the present invention, it is possible to secure a high suction force with a very thin denture attachment as compared with the conventional art. Can be mounted without removing the prosthesis, and a denture attachment that can be easily mounted on the denture can be provided.
[Brief description of the drawings]
FIG. 1 is a front view of a denture attachment according to a first embodiment.
FIG. 2 is a partially enlarged front view of the denture attachment in the first embodiment.
FIG. 3 is an enlarged sectional view of a main part of the denture attachment according to the first embodiment.
FIG. 4 is a partial perspective view of the denture attachment according to the first embodiment.
FIG. 5 is an explanatory view showing (A) a state before mounting a denture attachment and (B) a mounted state in the first embodiment.
FIG. 6 is an explanatory view showing a state of a magnetic loop of the denture attachment in the first embodiment.
FIG. 7 is a front view of a denture attachment according to the third embodiment.
FIG. 8 is a partially enlarged front view of a denture attachment in the third embodiment.
FIG. 9 is a partial perspective view of a denture attachment according to the third embodiment.
FIG. 10 is an explanatory view showing an opposing state of a denture attachment and a keeper in a third embodiment.
FIG. 11 is a partially enlarged front view of a denture attachment in the fourth embodiment.
FIG. 12 is a partial perspective view of a denture attachment according to the fourth embodiment.
FIG. 13 is a partial perspective view of a denture attachment in the fifth embodiment.
FIG. 14 is a partial perspective view of a denture attachment according to the sixth embodiment.
FIG. 15 is an explanatory view of a main part of a denture attachment in the seventh embodiment.
FIG. 16 is an explanatory view of a main part of a denture attachment in the eighth embodiment.
FIG. 17 is a diagram showing a relationship between the number of magnetic cells and a suction force per unit volume in the ninth embodiment.
FIG. 18 is a diagram showing the relationship between the total height and the suction force in the ninth embodiment.
FIG. 19 is an explanatory view of a denture in a conventional example.
FIG. 20 is an explanatory view of a denture attachment in a conventional example.
FIG. 21 is an explanatory view of a denture showing a state in which a denture attachment according to a conventional example is mounted.
FIG. 22 is a diagram showing a relationship between a total height of a denture attachment and a keeper and a suction force in a conventional example.
[Explanation of symbols]
1,8. . . Denture attachment,
11,110,12,13. . . Magnet layer,
2. . . yoke,
21, 210, 211, 213. . . Magnetic path,
22. . . Yoke back plate,
23. . . Side plate,
3,93. . . keeper,
4. . . Reinforcement plate,
45, 47. . . Corrosion resistant protective layer,
46. . . Non-magnetic corrosion resistant material,

Claims (12)

In a denture attachment that is planted on the denture base so as to face the keeper and attracts to the keeper by magnetic attraction,
The denture attachment includes a magnet layer and a yoke having an NS pole extending in a thickness direction facing the keeper, and a yoke.
Further, the yoke comprises a plurality of magnetic path portions penetrating in the thickness direction of the magnet layer, and a yoke back plate provided on the back of the magnet layer. 2. The thin denture attachment according to claim 1, wherein the magnetic path portion is a plurality of parallel plate walls crossing the magnet layer. 2. The thin denture attachment according to claim 1, wherein the magnetic path portion is a lattice wall that partitions the magnet layer into a polygon or a circle. 2. A thin denture attachment according to claim 1, wherein said magnetic path portion is a columnar body. The thin artificial tooth attachment according to any one of claims 1 to 4, wherein the thickness of the magnet layer is 0.01 to 1 mm. The thin denture attachment according to any one of claims 1 to 5, wherein the yoke has, on an outer peripheral portion thereof, a fixing auxiliary portion formed of a protrusion or a rough surface. The thin denture attachment according to any one of claims 1 to 6, wherein a reinforcing plate is provided on the yoke back plate. 8. The corrosion-resistant protective layer according to any one of claims 1 to 7, wherein the denture attachment has a nonmagnetic surface at a boundary between the magnet layer and the yoke, and a soft magnetic material. A thin denture attachment comprising: The thin artificial tooth attachment according to any one of claims 1 to 8, wherein the magnet layer is any one of a rare earth magnet, a platinum-based magnet, and an alnico magnet. The thin denture attachment according to any one of claims 1 to 9, wherein the yoke is a corrosion-resistant soft magnetic material. 9. The thin denture attachment according to claim 8, wherein the reinforcing plate is one or more of noble metals, titanium, titanium alloys, and ceramics. The method according to any one of claims 1 to 11, wherein the magnet layer is formed by any one of a vapor deposition method, a sputtering method, an ion plating method, a CVD method, a thermal spraying method, and a plating method. Thin denture attachment.

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