JP2021115322A - Dental magnetic attachment magnet structure - Google Patents

Abstract

To provide a dental magnetic attachment magnet structure that eliminates the need of a seal ring made of an austenitic stainless steel and further eliminates the need of being welded doubly.SOLUTION: A magnetic attachment magnet structure 100 includes: a magnet body 120; a cup yoke 110 made of a soft magnetic material and storing the magnet body; a seal member 130 fitted to an opening part of the cup yoke so as to encapsulate the magnet body; a whole circumference weld part 150 formed so as to cover an abutment part between the seal member and the cup yoke; and a recess part 170 formed in an edge part of a magnet body opposed surface of the seal member.SELECTED DRAWING: Figure 1

Description

The present invention relates to a dental magnetic attachment magnet structure that holds a prosthetic tooth by utilizing the magnetic attraction force of a permanent magnet. The present invention relates to a dental magnetic attachment magnet structure.

Patent Document 1 describes a permanent magnet assembly for stabilizing a denture. Hereinafter, the structure of Patent Document 1 will be described with reference to FIGS. 4 and 5.
Patent Document 1 describes a dental magnetic attachment magnet structure 400 having a permanent magnet 440 inside and embedded in a denture base 420, a root plate 450 embedded in an alveolar 460, and a keeper 410 arranged on the root plate. The denture 430 held on the root plate 450 by the magnetic attraction force of the denture 430 is disclosed. In the dental magnetic attachment magnet structure 500, the soft magnetic stainless steel seal disk 530 and the non-magnetic stainless steel seal ring 540 are concentrically arranged in the opening 560 of the soft magnetic stainless steel cup yoke 510, and the seal disk It has a structure in which the permanent magnet 520 is sealed by all-around welding 550 between the seal ring 540 and the seal ring 540 and between the seal ring 540 and the cup yoke 510. As a magnetic shield, the non-magnetic seal ring 540 reduces the amount of magnetic field emitted from the magnet 520 flowing from the magnet to the cup yoke 510, and concentrates it on the seal disk 530 to increase the attractive force of the magnetic attachment 500. I am aiming.

Japanese Unexamined Patent Publication No. 4-227253

The dental magnetic attachment magnet structure of Patent Document 1 uses non-magnetic austenitic stainless steel for the seal ring. Conventionally, austenitic stainless steel has been used in which an austenitic phase is generated by dissolving nickel, but since it contains nickel, a magnetic attachment magnet structure is applied to patients who develop metal allergy due to nickel. I couldn't.

Further, when the seal ring described in Patent Document 1 is fixed to the seal disk and the cup yoke, double welding is required, which complicates the manufacturing process and makes it difficult to reduce the cost.

Therefore, an object of the present invention is to provide a dental magnetic attachment magnet structure that does not require a seal ring made of austenitic stainless steel and does not need to be double welded.

The dental magnetic attachment magnet structure of the present invention includes a magnet body, a cup yoke of a soft magnetic material accommodating the magnet body, and a sealing member fitted in an opening of the cup yoke so as to enclose the magnet body. It is characterized by having an all-around welded portion formed so as to cover the abutting portion between the sealing member and the cup yoke, and having a recess on the edge portion of the sealing member facing the magnet body.

The magnetic attachment magnet structure of the present invention is characterized in that the recess is rectangular in cross section.

The magnetic attachment magnet structure of the present invention is characterized in that the recess is arcuate in cross section.

The magnetic attachment magnet structure of the present invention is characterized in that the opening of the cup yoke has a diameter-expanded portion, and the diameter-expanded portion is located at the opening end of the opening.

According to the dental magnetic attachment magnet structure of the present invention, the magnetic field generated by the magnet is generated only by the recess at the edge of the sealing member without using nickel-containing austenitic stainless steel that causes nickel allergy. A shielding effect can be obtained, and the magnetic field can be concentrated in the central part of the member, which can give a high attractive force to the dental magnetic attachment. Furthermore, since welding is only required, the cost of the dental magnetic attachment can be reduced.

According to the dental magnetic attachment of the present invention, even if the nickel-containing austenitic stainless steel that causes nickel allergy is not used, the shielding effect of the magnetic field generated by the magnet is obtained only by the concave portion at the edge of the sealing member. Further, since only one welding is required, the cost of the dental magnetic attachment can be reduced.

It is a shaft sectional view which shows the embodiment of this invention. It is a shaft sectional view which shows another embodiment of this invention. It is a cross-sectional view of the shaft which shows still another embodiment of this invention. It is a schematic cross-sectional view showing a state in which a denture having a magnetic attachment magnet structure is attached to a keeper arranged on a root plate embedded in an alveolar. It is a shaft sectional view which shows the conventional magnetic attachment magnet structure.

An embodiment of the present invention will be described with reference to FIG. The magnetic attachment magnet structure 100 seals a ferritic stainless steel cup yoke 110 having an opening 180 at one end, a permanent magnet 120 housed in the opening 180 of the cup yoke 110, and the opening 180 of the cup yoke. It is composed of a seal member 130, a seal member 130, and a welded portion 150 for fixing the butted portion of the cup yoke. The permanent magnet 120 is magnetized in the thickness direction (vertical direction in FIG. 1). The magnetic attachment magnet structure has a circular shape in a plan view, for example. Ferritic stainless steels are substantially free of nickel. Substantially means that nickel is not positively added, and nickel as an impurity of Fe contained in the production may be contained.

A recess is formed at the edge of the seal member 130 on the side facing the permanent magnet 120. The recess is formed along the edge of the sealing member 130. The recess referred to here is a stepped portion 170 (a portion in which the thickness of the edge portion of the sealing member is made thinner than that of the central portion) formed at the edge portion.

The diameter of the sealing member 130 and the diameter of the opening 180 of the cup yoke 130 are substantially the same. The term "substantially the same" as used herein means that the seal member 130 can be inserted and arranged in the opening of the cup yoke 110, and when the outer peripheral surface side of the seal member 110 is arranged in the opening of the cup yoke, the abutting portion can be welded. It means that the dimensions are large.

The permanent magnet 120 has, for example, a disk shape, and its diameter is formed to be smaller than the diameter of the opening 180 of the cup yoke 110. A gap is formed between the outer peripheral surface of the permanent magnet 120 and the inner peripheral surface of the opening 180.
The recess (step portion) 170 of the seal member 130 is formed in a circular shape along the edge portion of the seal member 130. The seal member 130 has a shape in which two disks having different sizes are coaxially stacked. A step is formed by the difference in diameter between the small disk and the large disk. The diameter of the small disk is smaller than the diameter of the permanent magnet 120.

The outer peripheral surface side of the seal member 130 and the butt portion of the opening 180 are welded by a known method. The weld 150 is formed so as to seal the cup yoke 110.

By adopting the above structure, in the dental magnetic attachment 100, among the magnetic fields generated by the permanent magnet 120, those emitted from the upper end surface side edge of the permanent magnet 120 avoid the stepped portion 170 which becomes a magnetic gap, and the seal member 130. It will flow to the vicinity of the central part of.
As a result, the magnetic field generated from the permanent magnet 120 flows from the sealing member 130 to the outside, and a strong attractive force is generated with the keeper.

A second embodiment of the present invention is shown in FIG. In the second embodiment, the recess 270 has an arcuate cross-sectional view, and other requirements are the same as those in the embodiment shown in FIG.

A third embodiment of the present invention is shown in FIG. Regarding the difference in the embodiment shown in FIG. 1 of the dental magnetic attachment magnet structure 300 shown in FIG. 3, only the different portion will be described.
The feature of the dental magnetic attachment magnet structure 300 shown in FIG. 3 is that it has a diameter-expanded portion 390 in which a part of the opening 380 is expanded.
The enlarged diameter portion 390 is formed at the opening end of the opening 380 of the cup yoke 310. The enlarged diameter portion 390 cooperates with the concave portion (step portion) 370 of the seal member 330 to suppress the magnetic field generated from the upper end surface edge portion of the permanent magnet 320 from flowing to the edge portion of the cup yoke 310 and the seal member 330. Make it flow near the center of the seal member 330.
As shown in FIG. 3, the diameter-expanding portion 390 is adapted to start diameter-expanding toward the opening end at a point between the bottom of the opening 380 of the cup yoke 310 and the opening end. The point at which the diameter increase is started may be gradually increased from the bottom, but as shown in FIG. 3, the diameter may be increased at a point between the bottom and the end.

The disclosed embodiments are all examples and are not limited. The scope of the present invention is indicated by the scope of claims and includes all modifications of the scope of claims and the scope of claims.

100 200 300 400 500 Dental magnetic attachment Magnet structure 110 210 310 510 Cup yoke 120 220 320 440 520 Magnet 130 230 330 Sealing member 530 Sealing disk 540 Sealing ring 150 250 350 550 Welded part 170 370 Stepped part (recess)
270 recess 180 280 380 560 opening (recess)
385 Bottom 390 Enlarged diameter 410 Keeper 420 Denture base 430 Denture 450 Root plate 460 Alveolus

Claims (4)

Covers the magnet body, the soft magnetic cup yoke that houses the magnet body, the seal member fitted in the opening of the cup yoke so as to enclose the magnet body, and the abutting portion between the seal member and the cup yoke. A dental magnetic attachment magnet structure having an all-around welded portion formed in a magnet and having a recess at an edge of a sealing member facing a magnet body. The dental magnetic attachment magnet structure according to claim 1, wherein the recess is rectangular in cross section. The dental magnetic attachment magnet structure according to claim 1, wherein the recess is arcuate in cross section. The magnet structure according to claim 1 or 2, wherein the opening of the cup yoke has a diameter-expanded portion, and the diameter-expanded portion is located at the opening end of the opening.

Images