JP2002233539A - Dental magnetic attachment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To rigidly fix a keeper and a magnetic structure in a dental magnetic attachment for connecting the keeper fixed in the oral cavity and the magnetic structure attached to an artificial crown with the magnetic force of the magnetic structure and retaining the artificial crown by an abutment tooth. SOLUTION: The dental magnetic attachment comprises the magnetic alloy keeper 10 fixed to the abutment tooth 3 inside the oral cavity and the magnetic structure 11 attached to the inside of the artificial crown 4 with a magnet to be attracted to the keeper 10. The artificial crown 4 is retained by the abutment tooth 3 as the keeper 10 is attracted with the magnetic force of the magnetic structure 11. In the dental magnetic attachment, the keeper 10 fixed to the abutment tooth in the oral cavity and the magnetic structure 11 attached to the inside of the artificial crown are engaged and connected with each other. Therefore, the keeper 10 and the magnetic structure 11 can be rigidly fixed, so that the denture can be mounted more comfortably.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an artificial artificial diaper which comprises a keeper fixed to an abutment tooth in the oral cavity and a magnetic structure attached to the inside of a prosthetic crown by magnetic attraction of the magnetic structure. The present invention relates to a dental magnetic attachment for maintaining a crown with an abutment tooth, and more particularly, to a dental magnetic attachment for fixing the keeper and a magnetic structure at a low pressure.

[0002]

2. Description of the Related Art There is a dental magnetic attachment as a device for maintaining a denture mounted in an oral cavity at a predetermined position. A conventional dental magnetic attachment of this type includes a keeper 1 made of a magnetic alloy, for example, as shown in FIG.
A magnetic structure 2 having magnetism so as to be able to be attracted to the upper surface of the keeper 1. The keeper 1 is fixed to an abutment tooth 3 in the oral cavity. It was attached inside the crown 4.

That is, the keeper 1 is fixed by a core 5 made of metal or resin on the upper surface of the abutment tooth 3 whose surface is cut into, for example, a convex shape. Further, the magnetic structure 2 is mounted inside the artificial crown 4 in a state where a small and strong magnet 6 is wrapped in a yoke 7 made of a magnetic alloy. When the artificial crown 4 is mounted in the oral cavity, the attraction surface of the magnetic structure 2 attached inside the artificial crown 4 and the keeper 1 fixed to the abutment tooth 3 are attracted by magnetic force. Thus, the artificial crown 4 was maintained at the position of the abutment tooth 3.

[0004]

However, in such a conventional magnetic magnetic attachment in which the artificial crown 4 is maintained by the abutment teeth 3 by the magnetic coupling between the keeper 1 and the magnetic structure 2, the keeper is used. When a large external force is applied to the artificial crown 4 in the lateral direction, the artificial crown 4 may come off the abutment tooth 3 and the magnetic structure 2 is fixed to a so-called gentle pressure. . That is, the artificial crown 4
Has been maintained on the abutment tooth 3 only by magnetic coupling between the upper surface of the keeper 1 and the attraction surface of the magnet 6.
Since the magnetic coupling has a weak attraction force to an external force from the lateral direction, the artificial crown 4 may come off from the abutment 3 when, for example, the denture is strongly engaged or a hard one is engaged.

[0005] When such operations are repeated, the surface including the keeper 1 and the core 5 fixed to the abutment tooth 3 and the attraction surface of the magnetic structure 2 attached to the inside of the artificial crown 4. Are worn away from each other, and a gap G as shown in FIG. 7 is generated therebetween. As a result, the force of the magnetic coupling between the keeper 1 and the magnetic structure 2 is reduced, so that the artificial crown 4 is easily detached from the abutment 3.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a dental magnetic attachment capable of fixing the above keeper and the magnetic structure at a non-relaxed pressure while addressing such problems.

[0007]

To achieve the above object, a dental magnetic attachment according to the present invention is provided with a keeper made of a magnetic alloy fixed to an abutment tooth in an oral cavity and a keeper attached to the inside of an artificial crown. A magnetic structure provided with a magnet to be attracted to the keeper, wherein the artificial crown is maintained at the abutment by suction of the keeper by the magnetic force of the magnetic structure. A keeper fixed to the trapezoid and a magnetic structure attached inside the artificial crown are fitted and connected.

[0008] With such a configuration, the magnetic structure attached to the inside of the artificial crown is fitted and coupled to the keeper fixed to the abutment tooth in the oral cavity. This allows
Even if a large external force is applied to the artificial crown from the lateral direction, the artificial crown does not come off from the abutment tooth, and is fixed at a so-called non-gradual pressure.

Further, the keeper is formed in a rod-like body, and the magnetic structure is formed in a cylindrical shape to be fitted to the keeper, so that the cylindrical magnetic structure is fitted to the keeper of the rod-like body. In this case, the keeper and the magnetic structure are fixed at a low pressure.

Further, in the keeper, the tip of the rod is tapered. Thereby, the tip of the keeper is tapered, and the body of the keeper is easily fitted inside the magnetic structure.

Further, in the magnetic structure, the entire cylindrical body may be formed of a magnet. Thereby, the magnetic flux density of the entire magnetic structure increases.

The magnetic structure has a structure for preventing the artificial crown from coming off on the outer peripheral surface of the cylindrical body. Thereby, the attachment of the magnetic structure to the artificial crown is strengthened, and the magnetic structure attached to the inside of the artificial crown does not come off from the artificial crown.

[0013]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a cross-sectional view showing a first embodiment of a dental magnetic attachment according to the present invention, and shows a state where an artificial crown 4 is maintained by an abutment tooth 3 by the dental magnetic attachment. . This dental magnetic attachment is for maintaining a denture mounted in the oral cavity so as not to move at a predetermined position, and includes a keeper 10 and a magnetic structure 11.

The keeper 10 includes a magnetic structure 11 to be described later.
The artificial crown 4 is maintained at a predetermined position in the oral cavity by the magnetic force, and is formed of a magnetic alloy, and is fixed to the abutment tooth 3 in the oral cavity. Here, the keeper 10 corresponds to FIG.
As shown in (a), it is formed in a rod-like body. The body 13 of the keeper 10 is a part to be fitted to the inner surface of the magnetic structure 11, and has a diameter d of about 3.2, for example.
It is formed in a substantially cylindrical shape having a height h of about 4 mm in mm (see FIG. 2B). In addition, the diameter d and the height h of the trunk 13 are not limited to the above-described sizes, and may be a size that matches the size of the artificial crown 4 and the like. Further, the shape is not limited to a substantially columnar shape, and may be a rod-shaped body having another shape according to the shape of the artificial crown 4.

Further, in the keeper 10, the tip portion 14 of the body portion 13 is formed in a tapered shape. Here, the taper angle θ of the tip portion 14 (see FIG. 2B) is formed to be, for example, about 6 °. Thereby, the keeper 1
0 of the body 13 is tapered.
Can be easily fitted to the inner surface of the magnetic structure 11 described later. Note that the angle of the taper angle θ of the distal end portion 14 is not limited to the above value, and is set according to the size and shape of the body portion 13.

The bottom surface of the base end 12 of the keeper 10 is attached to a support 15 as shown in FIG. The support portion 15 serves as a portion for attaching the keeper 10 to the oral cavity, for example, by utilizing the root of the tooth that has collapsed as the abutment tooth 3. Also, the keeper 1
In the case of 0, the position and number of the artificial crowns 4 attached to the denture are determined according to the number of artificial crowns 4 provided in the denture, the size and shape of the denture, the state of the patient's mouth, and the like. In addition, as described above, when the root of the tooth that has collapsed cannot be used as the abutment 3, the keeper 10 can be fixed in the oral cavity by an implant.

Next, the magnetic structure 11 is attracted to the keeper 10 by its magnetic force to maintain the artificial crown 4 on the abutment tooth 3. As shown in FIG. Is attached to the inside of the keeper 10 so as to be attracted to the keeper 10. As shown in FIG. 3B, the magnetic structure 11 has a cylindrical shape that fits into the body 13 of the keeper 10, and the magnet 16 and the cover 1
It consists of seven.

The magnet 16 is a ferromagnetic substance that creates a magnetic field outside the magnet 16 and is made of a magnetic material such as a neodymium iron magnet or a samarium cobalt magnet, and has, for example, a button shape. The cover body 17 supports the magnet 16 and prevents corrosion of the magnet 16, and is made of a magnetic alloy and has a cylindrical shape.

When the magnet 16 and the cover 17 are combined, the magnet 16 has a cylindrical shape fitted to the body 13 of the keeper 10, and the peripheral portion of the magnet 16 and the cover 1 are combined.
At a portion where the inner peripheral surface of the opening 7 is in contact with each other, a plurality of portions are joined by spot welding. Accordingly, the cover body 17 functions as a yoke material for increasing the attraction force of the magnet 16, and concentrates the magnetic flux lines generated from the magnet 16 inside the cover body 16 and prevents the leakage magnetic field to the outside. Therefore, when the body 13 of the keeper 10 is fitted to the inner surface of the magnetic structure 11, a closed magnetic path is formed, and the keeper 10 can be strongly attracted by magnetic coupling. The magnetic structure 11 is, for example, an inner diameter D so as to be completely fitted to the body 13 of the keeper 10.
i is about 3.3mm, outer diameter Do is about 4mm, and height H is about 4.7
Although it is formed in mm, the size is not limited thereto, and may be a size corresponding to the shape of the keeper 10 or the like.

From the above, the trunk 1 of the keeper 10
3 is fitted inside the cylindrical magnetic structure 11,
The keeper 10 and the magnetic structure 11 can be fixed at a so-called non-slow pressure. Thus, even when a large external force is applied to the artificial crown 4 from the lateral direction, the artificial crown 4 can be fixed so as not to come off from the abutment tooth 3. Therefore, the artificial crown 4 does not come off from the abutment tooth 3 even if, for example, a denture is strongly engaged or a hard one is bitten. In order to remove the artificial crown 4 fixed to the non-slow pressure from the abutment 3, the magnetic structure 1 is attached to the keeper 10 with respect to the artificial crown 4, as shown in FIG.
What is necessary is just to apply a force F of a predetermined magnitude in the axial direction in which 1 is fitted.

In the magnetic structure 11, the entire cylindrical body may be made of a magnet. That is, the portion corresponding to the cover 17 may be formed of the same ferromagnetic material as the magnet 16. As a result, the magnetic flux density of the entire magnetic structure 11 increases, and when the body portion 13 of the keeper 10 is fitted to the inner surface of the magnetic structure 11, the attraction force by the magnetic force can be further increased.

The magnetic structure 11 has a structure for preventing the artificial crown 4 from coming off the outer peripheral surface of the cylindrical body. For example, as shown in FIG. 3A, two grooves 18, 1 along the circumferential direction are formed on the outer peripheral surface of the magnetic structure 11.
8 are provided. When the magnetic structure 11 provided with such two grooves 18, 18 is attached to the inside of the artificial crown 4 using a method described later, the two grooves 18, 18 are provided.
The photo-curable resin enters the portion of the artificial crown 4, and the strength with which the magnetic structure 11 is attached to the artificial crown 4 increases. Further, a force F of a predetermined magnitude is applied to the artificial crown 4 in the axial direction in which the magnetic structure 11 is fitted to the keeper 10.
In addition, when the artificial crown 4 is detached from the abutment tooth 3 (see FIG. 1), the magnetic structure 11 does not come off from the artificial crown 4.

The magnetic structure 11 has two grooves 18 on the outer peripheral surface of the cylindrical body as a structure for preventing the artificial crown 4 from coming off.
Although the book (see FIG. 3A) has been described as being provided, the present invention is not limited to this, and the number may be in accordance with the height H. Further, the retaining structure is not limited to the groove 18 and may be any structure as long as the magnetic structure 11 does not come off from the inside of the artificial crown 11. For example, a convex ring,
Protrusions that scatter may be used.

Next, a description will be given of a method of attaching the magnetic structure 11 formed in a cylindrical shape to the inside of the artificial crown 4 when producing a denture having the above-described magnetic attachment. Here, the keeper 10 is already fixed to the abutment teeth 3 in the oral cavity, and the magnetic structure 11
Must be attached so as to be completely fitted to the body 13 of the fixed keeper 10.

Therefore, first, the magnetic structure 11 is fitted inside the mounting recess of the artificial crown 4 filled with, for example, a photocurable resin having a predetermined viscosity. Next, the artificial crown 4 is mounted in the oral cavity of the patient such that the magnetic structure 11 fitted into the artificial crown 4 is completely fitted to the keeper 10 fixed to the abutment tooth 3. At this time, the tip of the keeper 10 has a tapered shape as described above, and the magnetic structure 11 attached to the artificial crown 4 has an artificial tooth due to the viscosity of the photocurable resin. Because it can move inside the mounting recess of the crown 4,
The keeper 10 and the magnetic structure 11 can be easily fitted.

Then, in order to fix the magnetic structure 11 positioned so as to be fitted to the keeper 10 to the artificial crown 4 at the same position, the light curable resin is irradiated with light to cure the resin. Let it. Thus, a denture can be created in which the magnetic structure 11 is completely fitted to the keeper 10 fixed to the abutment tooth 3. Therefore, the denture created in this way is maintained so as not to move at a predetermined position in the oral cavity. Note that the photocurable resin is provided in the groove 1 provided on the outer peripheral surface of the magnetic structure 11.
The magnetic structure 11 is also hardened at the portions 8 and 18 so that the magnetic structure 11 does not come off the artificial crown 4.

In the above description, the keeper is formed in a rod-like body, and the magnetic structure is formed in a cylindrical shape to be fitted in the keeper. The shape is not limited to the shape described above as long as it can be maintained so as not to move, and the present invention can be applied to a dental magnetic attachment having another shape. A dental magnetic attachment according to such another embodiment will be described with reference to FIGS.

FIG. 4 is a perspective explanatory view showing a second embodiment of the dental magnetic attachment. This dental magnetic attachment uses a remaining crown 20 in the oral cavity to maintain a partial denture so as not to move at a predetermined position. For example, as shown in FIG. A keeper 21 made of a magnetic alloy formed in a U-shaped column shape is fixed inside the side surface of the remaining crown 20. A magnetic structure 22 (see FIG. 4 (b)) to be attracted to the keeper 21 is attached to the inside of the side surface of the artificial crown not shown, and the shape is fitted to the keeper 20 for connection. I can do it. Thereby, the keeper 2
1 and the magnetic structure 22 can be fixed to a non-slow pressure,
Even if the surface where the keeper 21 and the magnetic structure 22 are fitted is worn out, the magnetic force of the magnetic structure 22 causes the keeper 21 to move.
Can be maintained semi-permanently.

FIG. 5 is a perspective sectional view showing a third embodiment of the dental magnetic attachment. This dental magnetic attachment is another example of using a remaining crown 24 in the oral cavity to maintain a partial denture so as not to move at a predetermined position. As shown in FIG. For example, the keeper 23 whose section is formed in a key-shaped column shape is
A magnetic structure 25 (see FIG. 5) which is fixed to the outside of the side surface of the
(See (b)) is attached to the inside of the side surface of an artificial crown (not shown). The shape of the dental magnetic attachment applied to such a partial denture is shown in FIG.
Alternatively, it is not limited to the one shown in FIG. 5 and may be formed according to the shape of the remaining crown in the oral cavity, the size of the artificial crown, and the like.

FIG. 6 is a sectional view showing a fourth embodiment of the dental magnetic attachment. The dental magnetic attachment includes a fixed bridge 2 attached to bar abutment teeth 26 fixed to the remaining root in the oral cavity.
7, the sleeve 28 attached to the inside of the artificial crown (not shown) is fixed to maintain the artificial crown at a predetermined position in the oral cavity. That is, the bridge 27 fixed in the oral cavity is formed of a magnetic alloy to function as a keeper, and the sleeve 28 attached to the inside of the artificial crown has a magnet to function as a magnetic structure. ing. Thereby, the bridge 2
The sleeve 7 and the sleeve 28 can be fixed at a non-slow pressure, and the force of joining the bridge 27 can be maintained semipermanently by the magnetic attraction of the sleeve 28.

[0031]

The present invention has been configured as described above.
According to the first aspect of the present invention, the magnetic structure including the magnet attached to the inside of the artificial crown and attracted to the keeper is fitted to the magnetic alloy keeper fixed to the abutment tooth in the oral cavity. The artificial crown does not come off from the abutment tooth even when a large external force is applied to the artificial crown from the lateral direction, and the keeper and the magnetic structure are so-called non-relaxed. Can be fixed. Therefore, for example, even if the denture is strongly engaged or a hard object is bitten, the artificial crown does not come off from the abutment tooth, so that the attachment of the denture can be improved.

According to the second aspect of the present invention, the keeper is formed in a rod-like body, and the magnetic structure is formed in a cylindrical shape to be fitted to the keeper, so that the keeper of the rod-like body is formed. By fitting the cylindrical magnetic structure into the keeper, the keeper and the magnetic structure can be fixed at a low pressure.
Therefore, for example, even if the denture is strongly engaged or a hard object is bitten, the artificial crown does not come off from the abutment tooth, so that the attachment of the denture can be improved.

According to the third aspect of the present invention, in the keeper, since the tip of the body is tapered, the tip of the keeper is tapered, and the body of the keeper is formed of the magnetic structure. It can be easily fitted inside the body. Therefore, the operation of mounting the denture in the oral cavity can be easily performed.

Further, according to the fourth aspect of the present invention, the magnetic structure can have a high magnetic flux density because the entire cylindrical body is formed of magnets. . Therefore, the attraction force due to the magnetic force when the body of the keeper is fitted inside the magnetic structure further increases, and the artificial crown can be firmly maintained by the abutment teeth.

Further, according to the fifth aspect of the present invention, the magnetic structure is provided with a retaining structure from the artificial crown on the outer peripheral surface of the cylindrical body, so that the magnetic structure is provided. Is attached to the artificial crown, and the magnetic structure attached inside the artificial crown can be prevented from falling out of the artificial crown. In addition, when a predetermined magnitude of force is applied to the artificial crown in the axial direction in which the keeper and the magnetic structure are fitted to each other, and the artificial crown is removed from the abutment, the magnetic force from the artificial crown is also reduced The structure can be prevented from coming off.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of a dental magnetic attachment according to the present invention, showing a state where an artificial crown is maintained by an abutment tooth by the dental magnetic attachment.

FIGS. 2A and 2B are explanatory views showing the shape of a keeper of the dental magnetic attachment, wherein FIG. 2A is a front view and FIG.

3A and 3B are explanatory views showing the shape of a magnetic structure of the dental magnetic attachment, wherein FIG. 3A is a front view, and FIG. 3B is a central longitudinal sectional view.

4A and 4B are explanatory views showing a second embodiment of the dental magnetic attachment, wherein FIG. 4A is a perspective cross-sectional view showing a keeper fixed inside a remaining crown, and FIG. 4B is a keeper and magnetic structure. It is sectional drawing explaining a body.

5A and 5B are explanatory views showing a third embodiment of the dental magnetic attachment, wherein FIG. 5A is a perspective cross-sectional view showing a keeper fixed outside the remaining crown, and FIG. 5B is a keeper and magnetic structure. It is sectional drawing explaining a body.

FIG. 6 is an explanatory view showing a fourth embodiment of the dental magnetic attachment.

FIG. 7 is a cross-sectional view showing a configuration of a conventional dental magnetic attachment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 3 ... Abutment tooth 4, 20, 24 ... Artificial crown 10, 21, 23 ... Keeper 11, 22, 25 ... Magnetic structure 12 ... Base end 13 ... Trunk 14 ... Tip 15 ... Supporting part 16 ... Magnet Reference Signs List 17 ... Cover body 18 ... Groove 26 ... Bar abutment teeth 27 ... Bridge 28 ... Sleeve θ ... Taper angle d ... Diameter of body part h ... Height of body part Di ... Inner diameter of magnetic structure Do ... Outside of magnetic structure Diameter H: Height of magnetic structure

Claims (5)

[Claims] 1. A magnetic structure comprising: a keeper made of a magnetic alloy fixed to an abutment in an oral cavity; and a magnetic structure provided inside a prosthetic crown and having a magnet to be attracted to the keeper. In a dental magnetic attachment for maintaining the artificial crown with an abutment by suction of the keeper by the magnetic force of the magnetic force, a keeper fixed to the abutment tooth in the oral cavity and a magnetic structure attached inside the artificial crown A magnetic dental attachment characterized by fitting and joining. 2. The dental magnetic attachment according to claim 1, wherein said keeper is formed in a rod-like body, and said magnetic structure is formed in a cylindrical shape to be fitted to said keeper. 3. The dental magnetic attachment according to claim 2, wherein the keeper has a rod-shaped body having a tapered tip portion. 4. The dental magnetic attachment according to claim 2, wherein the magnetic structure is formed entirely of a magnet with a cylindrical body. 5. The dental structure according to claim 1, wherein the magnetic structure is provided with a retaining structure on the outer peripheral surface of the cylindrical body from the artificial crown. Magnetic attachment.