JPH05103797A - Metal member for denture stability - Google Patents

Abstract

PURPOSE:To conduct diagnosis by removing the disorder of an image due to MRI by providing a retention plate that consists of a soft magnetic material, at an end surface opposite to a permanent magnet assembly body embedded at a denture, forming it so as to be attachable/detachable to/from a main body consisting of a non-magnetic material. CONSTITUTION:A main body consisting of a non-magnetic material is embedded in a tooth root. Also, at a root surface member 1 for false toot stability that provides a retention plate 3 consisting of a soft magnetic material at an end surface opposite to a permanent magnet assembly body embedded at a denture, the retention plate 3 is formed so as to be attachable/detachable to/from the main body. In the case of retaining the denture, the retention plate 3 is screwed through a male screw 12 and a female screw 11 until it butts against the bottom portion of a recessed hole 10. In this instance, using a spanner that is to be engaged with turning holes 13 is better. In the case of the retention plate 3 being removed, all that is required is to rotate the retention plate 3 in the reverse direction by means of the spanner. By removing the retention plate 3, the action of magnetic field scattering is removed, so accurate diagnosis can be conducted also by for example, MRI utilization.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a root member for stabilizing a denture for use in a prosthetic method for holding a denture by using a magnetic attraction force of a permanent magnet.

[0002]

2. Description of the Related Art Various attempts have been made in the past to utilize a magnetic attraction force acting between a permanent magnet and a soft magnetic alloy when fixing a denture in the oral cavity, for example, "TR Jackson." : Application of a maintenance device using a rare earth magnet for an osseo integrated implant, Oral Maxirofacial Implant, Vol. 1 (1987), No. 2, pp. 77-89 ".

FIG. 6 is a longitudinal sectional view of an essential part showing an example of artificial tooth fixing means utilizing the magnetic attraction force of a permanent magnet. In FIG. 6, reference numeral 1 denotes a root member, which is made of, for example, a corrosion-resistant non-magnetic material such as a gold alloy and has a T-shaped longitudinal section, and is embedded in a tooth root 2. Reference numeral 3 denotes a holding plate, which is formed of a corrosion-resistant magnetic stainless steel such as SUS447J1 into a disc shape and is integrally embedded in the end portion of the root member 1 with a cast member.

Next, 4 is a denture base, in which a denture 5 is implanted and a permanent magnet assembly 6 is embedded so as to face the root member 1. The permanent magnet assembly 6 is formed by hermetically sealing a permanent magnet 8 in a case 7 made of, for example, corrosion-resistant magnetic stainless steel via a cover plate 9. With the above structure, a magnetic attraction force acts between the permanent magnet assembly 6 and the root member 1, and the denture base 4 is pressed against the tooth root 2 by this magnetic attraction force, and the denture 5 is placed in the oral cavity. It can be stabilized.

[0005]

In the denture fixing means having the above-mentioned structure, the denture base 4 can be held securely and the denture base 4 can be easily attached and detached. On the other hand, an individual who applies the denture fixing means, for example, When using MRI (Magnetic Resonance Diagnostic Device), there is a problem that an accurate diagnosis cannot be made because the image is disturbed. That is, even if the permanent magnet assembly 6 is removed together with the denture base 4, since the holding plate 3 made of a soft magnetic material is provided at the end of the root member 1, the image in MRI is disturbed. Since the holding plate 3 is integrally formed on the root member 1 by casting or casting, it cannot be easily removed. Therefore, there is a problem in that an individual applying the artificial tooth fixing means utilizing the magnetic attraction force of the permanent magnet cannot diagnose by MRI.

The present invention solves the above-mentioned problems existing in the prior art, and does not cause image distortion due to MRI.
It is an object of the present invention to provide a root surface member for stabilizing a denture that enables accurate diagnosis.

[0007]

In order to achieve the above object, according to the present invention, a main body made of a non-magnetic material is embedded in a tooth root, and is provided on an end surface facing a permanent magnet assembly embedded in a denture base. In a root member for stabilizing a denture, which is provided with a holding plate made of a soft magnetic material, a technical means is adopted in which the holding plate is detachably attached to the main body.

In the present invention, the following is a mode in which the holding plate is detachably formed on the main body. (1) A concave hole having an internal thread is provided at the end of the main body, and a holding plate having an external thread is screwed into the concave hole. It can be removed from the main body by rotating the holding plate, and it can be a detent due to the contact between the holding plate and the bottom surface of the concave hole when screwed. (2) A holding member, which is made of a non-magnetic material at the end of the main body and has a recessed hole with an internal thread, is integrally provided by casting, and a holding plate with an external thread is provided in the recessed hole of the holding member. Screw on. The holding plate can be attached and detached in the same manner as (1) above. (3) A concave hole is provided at the end of the main body, and the holding plate is mounted in the concave hole via a resin adhesive. When it is mounted, it is held by the adhesive force of dental adhesive or cement, but when it is removed, ultrasonic vibration is applied by, for example, an ultrasonic scaler to destroy the adhesive and remove the holding plate. (4) A holding hole formed by forming a concave hole at the end of the main body and screwing a screw member made of a soft magnetic material into the center is fitted. An adhesive may be used in combination for fixing the holding plate. For removal, first remove the screw member by rotation, then screw in a jig equipped with an external thread of the same size as the screw member, and remove the holding plate by lifting it from the recess.

[0009]

With the above structure, the holding plate can be attached to and detached from the root surface member, and the predetermined holding force is maintained when the denture base is attached, while holding is performed when there is a possibility that magnetic characteristics such as MRI utilization are affected. It can be expected that the plate can be removed.

[0010]

1 is an explanatory view showing a first embodiment of the present invention, in which (a) is a longitudinal sectional view of an essential part and (b) is a plan view of the essential part. In FIG. 1, reference numeral 10 denotes a recessed hole, which is provided at the end of the root member 1 and a female screw 11 is provided on the inner peripheral surface of the recessed hole 10. Next, on the outer peripheral surface of the holding plate 3, a male screw 12 that is screwed into the female screw 11 is provided. Reference numeral 13 denotes a rotation hole, which is provided on the outer end surface of the holding plate 3.

With the above construction, when holding a denture base (not shown), the male screw 12 and the female screw are held until the holding plate 3 comes into contact with the bottom of the recessed hole 10 as shown in FIG. 1 (a). It is screwed through 11. In this case, it is preferable to use a driver or a spanner that engages with the rotation hole 13. When removing the holding plate 3, the holding plate 3 may be rotated in the opposite direction to the above by a driver or a spanner.
By removing the holding plate 3, the action of magnetic field confusion by the root member 1 is eliminated, so that accurate diagnosis can be performed by using, for example, MRI.

FIG. 2 is a longitudinal sectional view of the essential parts showing a second embodiment of the present invention. In FIG. 2, reference numeral 14 is a holding member, which is formed of a non-magnetic material and has a concave hole 15 provided with an internal thread. The holding member 14 is integrally provided on the end portion of the root surface member 1 by casting or casting. A male screw to be screwed with the female screw is provided on the outer circumference of the holding plate 3. The attaching / detaching operation of the holding plate 3 having the above structure is the same as that in the first embodiment.

FIG. 3 is a longitudinal sectional view of a main part showing a third embodiment of the present invention. In FIG. 3, reference numeral 16 denotes a recessed hole, which is provided at the end of the root member 1 in the shape of, for example, a circular hole. Then, for example, a disc-shaped holding plate 3 is mounted in the recessed hole 16 via a dental adhesive 17 and used to hold a denture base (not shown). When removing the holding plate 3, for example, ultrasonic vibration of 20 kHz is applied to the holding plate 3 by, for example, an ultrasonic scaler or the like to remove the adhesive 17 in a heat-melted state.

4A and 4B are explanatory views showing a fourth embodiment of the present invention. FIG. 4A is a longitudinal sectional view of an essential part, and FIG. 4B is a longitudinal sectional view of an essential part showing a state where the holding plate is removed. In FIG. 4, reference numeral 18 denotes a concave hole, which is provided at the end of the root member 1. Reference numeral 19 denotes a screw member, which is made of a soft magnetic material similar to that of the holding plate 3 and is screwed to the central portion of the holding plate 3. When the holding plate 3 is fitted into the concave hole 18, a press-fitting means may be used or an adhesive may be used together. By fitting the holding plate 3 as shown in FIG. 4A, a part of the magnetic path is formed together with the screw member 19, so that the denture base (not shown) can be held. When removing the holding plate 3, first, the screw member 19 is rotated to be removed, and then, as shown in FIG. 4B, the jig 2 provided with an external thread having the same size as the screw member 19.
The holding plate 3 can be lifted from the concave hole 18 and removed by screwing 0 and further rotating after reaching the bottom surface of the concave hole 18.

FIG. 5 is a longitudinal sectional view of the essential parts showing the fifth embodiment of the present invention. In FIG. 5, 1a and 3a are notches, and the one shown in (a) is the holding plate 3 at the upper end of the root member 1.
At the boundary between the holding plate 3 and the one shown in FIG. When the holding plate 3 is attached, the notches 1a and 3a are filled with the dental adhesive 17, but when the holding plate 3 is removed, the adhesive 17 in the notches 1a and 3a is dug. After raising, a driver etc. may be inserted and removed.

In the above embodiment, the holding plate 3 having a circular outer contour has been described, but it is needless to say that the holding plate 3 may have an oval or other non-circular shape.

[0017]

EFFECTS OF THE INVENTION Since the present invention has the structure and operation as described above, it does not reduce the holding power of the denture base and does not cause image distortion even when a magnetic field application device such as MRI is used. There is an effect that an accurate diagnostic result can be obtained.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a first embodiment of the present invention,
(A) is a longitudinal sectional view of a main part, and (b) is a plan view of the main part.

FIG. 2 is a longitudinal sectional view of a main part showing a second embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of a main part showing a third embodiment of the present invention.

FIG. 4 is an explanatory view showing a fourth embodiment of the present invention,
(A) is a longitudinal cross-sectional view of an essential part, and (b) is a longitudinal cross-sectional view of an essential part showing a state in which a holding plate is removed.

FIG. 5 is a longitudinal sectional view of a main part showing a fifth embodiment of the present invention.

FIG. 6 is a longitudinal cross-sectional view of essential parts showing an example of artificial tooth fixing means using magnetic attraction of a permanent magnet.

[Explanation of symbols]

 1 Root member 3 Holding plate 10, 15, 16, 18 Recessed hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tsutomu Iimura 5200 Sankejiri, Kumagaya-shi, Saitama Hitachi Metals Co., Ltd. Magnetic Materials Research Laboratory (72) Inventor Hirohide Yamada 5200 Sankejiri, Kumagaya-shi, Saitama Hitachi Metals Co., Ltd. Inside the Magnetic Materials Laboratory (72) Inventor Shizuo Toyoda, 6-1, Manazuru, Kokurakita-ku, Kitakyushu, Fukuoka Prefecture, Kyushu Dental University Hospital (72) Inventor, Shinichi Masumi, 2-chome, Manazuru, Kokurakita-ku, Kitakyushu, Fukuoka Prefecture 1 Kyushu Dental University Hospital (72) Inventor Oku Osamu 2-3-10 Kanda Surugadai, Chiyoda-ku, Tokyo Tokyo Medical and Dental University Medical Equipment Laboratory (72) Inventor Kazuo Nakamura 1-5 Yushima, Bunkyo-ku, Tokyo 45 Tokyo Medical and Dental University Faculty of Dentistry

Claims (5)

[Claims] 1. A root member for stabilizing a denture, in which a main body made of a non-magnetic material is embedded in a tooth root, and a holding plate made of a soft magnetic material is provided on an end face facing a permanent magnet assembly embedded in a denture base. 2. A root plate member for stabilizing a denture, characterized in that the holding plate is detachably formed on the main body. 2. A concave hole provided with an internal thread is provided at the end of the main body,
The root plate member for stabilizing a denture according to claim 1, wherein a holding plate having a screw on its outer periphery is screwed into the concave hole. 3. A holding member, which is formed of a non-magnetic material at the end of the main body and has a recessed hole provided with a female screw, is integrally provided by means of a cast case, and a holding plate provided with a screw on the outer periphery is provided in the holding member. The root member for stabilizing a denture according to claim 1, wherein the root member is screwed into the hole. 4. A root member for stabilizing a denture according to claim 1, wherein a concave hole is provided at an end of the main body, and a holding plate is mounted in the concave hole via a dental adhesive or cement. . 5. The denture stabilizing root according to claim 1, wherein a recessed hole is provided at an end of the main body, and a holding plate formed by screwing a screw member made of a soft magnetic material is fitted at a central portion. Face member.