JPH06296625A - Magnetic type denture retention device - Google Patents

Abstract

PURPOSE:To provide the magnetic type denture retention device which is capable of sufficiently increasing the joining force of a keeper screw and making it possible to obtain stable retentive force and has the good corrosion resistance of a magnet with high reliability. CONSTITUTION:A titanium fixture 2 is screwed into the formed cavity bored in the jaw bone. A titanium abutment 3 penetrating the mucous membrane is fastened and connected to the upper part of this titanium fixture 2 by a keeper screw 5 which is a headed screw shape consisting of a magnetic stainless steel alloy having external threads formed so as to be fitted into the internal threads board on the inner side of the fixture 2. A magnet structural body inserted into the denture so as to come into tight contact with the keeper screw 5 is placed on the keeper to fix the denture by the magnetic attraction force of the magnet structural body and the keeper.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic denture maintenance device applied to an implant denture.

[0002]

2. Description of the Related Art Various attempts have already been made to use an attractive force acting between a permanent magnet and a soft magnetic alloy to fix an implant denture, and an example thereof is "TR Jackson: Osseointegrate". Application of Rare Earth Magnet Sustainer for Ited Implant, Oral Maxirofacial Implant, V
ol. 1 (1987), No. 2, 77-89 ". For example, as shown in FIG. 2, it has a dedicated keeper screw 5 and magnet 6 compatible with the Nobel Farmer pure titanium Osseo integrated implant system. This assembled sectional view is shown in FIG. 3 (the magnet 6 is not shown). In FIG. 3, a fixture 2, an abutment 3 and an abutment screw 4
Is made of pure titanium and is sold by Nobel Farmer. The keeper screw 5 is a 416 magnetic stainless alloy, and the keeper screw 5 is screwed into the abutment screw 4 screwed into the fixture 2 to connect the abutment 3 to the fixture 2. The above is the implant structure to be installed in the oral vagina, and the magnet used as a pair for this keeper is embedded in the denture. In such an implant system, it is used for fixing a denture, for example, as shown in FIG. That is, when two implant structures 7 are erected in the canine part of the lower jaw and the overdenture 8 is placed on the upper part of the implant structure 7 so as to correspond to the keeper, the magnet and the keeper come into close contact with each other. Due to the mutual magnetic attraction, the overdenture 8 can be maintained in the implant structure 7.

[0003]

However, the present invention has found that the above-mentioned implant system has the following problems. That is, the keeper screw 5
Used a commercially available fixture 2, abutment 3 and abutment screw 4 and produced a keeper screw 5 in accordance with it, so that the diameter of the screw part is larger than the outer diameter of the head of the keeper screw. The tightening force is considered to be insufficient due to the small size. Further, since the top of the abutment screw is located above the upper surface of the abutment, in order to fasten the abutment with the keeper screw, an umbrella shape is used to press the outer periphery of the abutment against the outer periphery of the keeper screw. There is a need. Therefore, it is expected that the shape of the keeper screw will be complicated and that the fastening force of the abutment will be unstable. further,
Although the magnet embedded in the denture is plated, the mucosal surface portion is exposed to the corrosive environment in the vagina of the mouth, and there is a problem in the corrosion resistance of the magnet. The present invention solves the above problems in the prior art, and provides a magnetic denture maintenance device capable of sufficiently increasing the fastening force of the keeper screw, obtaining a stable maintenance force, and having more reliable corrosion resistance of the magnet. The purpose is to

[0004]

In order to achieve the above object, a titanium implant body is embedded in a forming cavity formed in a jaw bone, and a male thread is formed inside the implant body so as to fit with a female thread formed in the body. With a keeper screw in the shape of a screw with a head made of magnetic stainless alloy, a gingival mucosa penetrating extension part made of titanium that penetrates the mucous membrane is tightened and connected to the upper part of the implant body, and embedded in the denture so as to adhere closely to the keeper screw The magnet structure is placed and the denture is fixed by the magnetic attraction of the magnet structure and the keeper. The magnet structure includes a permanent magnet, a case made of a corrosion-resistant magnetic material having a recess for housing the permanent magnet, and a seal plate made of a corrosion-resistant material for covering the permanent magnet so as not to be exposed from an opening of the case recess. And the seal plate is composed of two types of components, a seal edge member made of a corrosion-resistant non-magnetic material and a seal plate made of a corrosion-resistant soft magnetic material having an outer peripheral shape substantially the same as the inner peripheral shape of the seal edge member. And the abutting portion of the case and the seal plate are seam welded. Further, the permanent magnet used in the present invention is required to be small in size and obtain a magnetic flux as strong as possible.
Rare earth magnets such as dFe based magnets are used. Further, the shape thereof is usually cylindrical or cylindrical although it depends on the portion to be used. Therefore, a ring-shaped thin plate member is often used as the seal edge member, and a disc-shaped thin plate member is often used as the seal plate. The permanent magnet is usually magnetized before it is put into the case, but it may be magnetized after the magnet body is assembled.

[0005]

EXAMPLES The present invention will be described below in detail with reference to Examples, but it goes without saying that the present invention is not limited to these Examples. FIG. 1 is a cross-sectional view of an implant structure showing an example of the present invention. A titanium fixture 2 having a diameter of 3.75 mm and a length of 13 mm manufactured by Nobel Farmer and a Ti abutment 3 having a height of 5.5 mm which matches the fixture are used, and the abutment 3 is used as the fixture 2. To connect
A cross section of the keeper screw 5 that has a male screw of a size that fits a female screw drilled inside the fixture 2 and that the lower surface of the flange of the screw head is in close contact with the cylindrical upper surface of the abutment 3. A dimensional drawing is shown in FIG. In addition, FIG.
Shows a sectional view of the magnet structure of the present invention. 1 in FIG.
Reference numeral 1 is a permanent magnet, 12 is a case made of corrosion-resistant stainless steel having magnetism, 15 is a seal edge member, a seal ring made of non-magnetic corrosion-resistant stainless steel, 16 is a seal disk made of magnetic corrosion-resistant stainless steel, and 14 is a seal disk.
Is an adhesive. As shown in the figure, since the outer peripheral portion of the case 12 and the abutting portion of the seal ring 15 or the abutting portion of the seal ring 15 and the seal disc 16 are sealed by laser welding, the problem of corrosiveness of rare earth magnets is not a problem. I was able to solve it.

[0006]

According to the present invention, the fastening force of the abutment and the instability of the fastening force due to the abutment screw and the keeper screw, which were conventionally insufficient, can be improved. Further, since the rare earth magnet is covered with the magnetic stainless steel yoke and the shield plate, and the abutting portion of the rare earth magnet is sealed with the laser, the corrosiveness of the rare earth magnet can be solved. Due to the above improvements, a magnetic denture maintenance device applicable to implant dentures could be completed by the magnetic attraction force of the magnet structure and the keeper screw.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an implant structure showing an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a conventional implant system.

FIG. 3 is a cross-sectional view of a conventional implant structure.

FIG. 4 is an explanatory diagram showing an example of a method of using an implant system for fixing a denture.

FIG. 5 is a product dimensional diagram of a keeper screw showing an embodiment of the present invention.

FIG. 6 is a cross-sectional view of a magnet structure showing an example of the present invention.

[Explanation of symbols]

1 implant body, 2 fixture, 3 abutment, 4 abutment screw, 5 keeper screw, 6 magnet

Claims (2)

[Claims] 1. A screw shape with a head made of a magnetic stainless alloy in which a titanium fixture is screwed into a formation hole formed in a jaw bone and a male screw is formed so as to fit into a female screw formed inside the fixture. With a keeper screw, a titanium abutment that penetrates the mucous membrane is fastened and connected to the upper part of the fixture, and the magnet structure embedded in the denture is placed so as to be in close contact with the keeper screw. And a magnetic denture maintenance device characterized in that a denture is fixed by a magnetic attraction force of a keeper. 2. The magnet structure is made of a permanent magnet, a case made of a corrosion-resistant magnetic material having a recess for accommodating the permanent magnet, and a corrosion-resistant material for covering the permanent magnet from the opening of the case recess so as not to expose the permanent magnet. And a seal plate made of a corrosion-resistant soft magnetic material having an outer peripheral shape substantially the same as the inner peripheral shape of the seal edge member. The magnetic denture maintenance device according to claim 1, wherein the magnetic denture maintenance device is configured and the abutting portions of the case and the seal plate are seam welded.