JPH08150156A - Magnetic attachment for denture - Google Patents

Abstract

PURPOSE: To provide a magnetic attachment for denture embodied in a magnet structure for attraction to a root face place, with which slipping off of the denture over a long period of time is prevented by introducing such a configuration that a projection joined with the side face of a case is encapsulated in the bed of denture to generate a mechanical engagement when the attachment is embedded in the bed of the denture. CONSTITUTION: A magnetic attachment for denture is composed of a magnet structure 1 for attraction to a root face plate, a case 2 made of an anti-corrosive non-magnetic alloy crowned excluding the attraction surface 14 on the root face plate side of the magnet structure 1, and a projection 3 joined with the side face 20 of the case 2. The magnet structure 1 is composed of a plate-form magnet 10 having poles parallel with the attraction surface 14 yokes 11, 12 pinching the magnet 10 from the side with poles, and a spacer 13 which is made of an anti-corrosive magnetic alloy and encloses the surface of magnet 10 on the attraction surface 14 side for isolation from the external environment. The projection 3 is arranged so that furnished over the whole peripheral circumference of the side face 20 is encapsulated in the bed of denture for generating a mechanical engagement when the attachment is embedded in the bed of the denture.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic attachment for a denture which holds a denture on a root plate with a magnetic attraction force.

[0002]

2. Description of the Related Art As a conventional magnetic attachment for artificial teeth, there is one disclosed in, for example, Japanese Patent Laid-Open No. 1-303145. Generally, as shown in FIG. 4, a denture magnetic attachment 100 is embedded in a cavity inside a resin-made denture base 102 in which artificial teeth 101 are planted, and is used as a dental adhesive as a dedicated adhesive utilizing a polymerization reaction. Polymerized material 10
It is fixed at 3. On the other side of the gum, a keeper 107 made of soft magnetic matching metal forming a part of the root plate 106 is embedded on the exposed surface of the root plate 106 embedded in the natural tooth root 105 remaining in the gum 104. That is, the tooth root 10
The magnetic attachment 100 for a denture is embedded in the denture base 102 so as to face the root plate 106 to which the keeper made of soft magnetic matching gold embedded in the fifth portion is fixed.

As shown in FIG. 2, the external shape of the magnetic attachment for a denture is capped with a case 2 which covers the entire circumference except the suction surface facing the root plate. Further, it has a shape close to a prismatic column or a column having a side surface 20 that rises perpendicularly to the suction surface, and has no special protrusion or the like.

[0004]

As described above, when the conventional magnetic attachment for denture is embedded and fixed in the denture base, it is adhesively fixed by using a dedicated adhesive agent utilizing the polymerization reaction. However, because the adhesive is embedded and fixed only by the adhesive strength (tensile stress and shear stress) of the adhesive, the adhesive surface peels off due to deterioration of the adhesive during long-term use, and the fixing and holding power decreases. However, there was a possibility that the magnetic attachment for dentures would fall off the denture base.

Therefore, it is an object of the present invention to provide a magnetic attachment for a denture that mechanically engages with the denture base to prevent the denture from falling off despite deterioration of the adhesive.

[0006]

A magnetic attachment for a denture according to the present invention is a magnetic attachment for a denture that is embedded in a denture base so as to face a root plate made of soft magnetic matching metal embedded in a root portion of the magnetic attachment. The magnetic attachment includes a magnet structure that is attracted to the root plate, and a case made of a corrosion-resistant non-magnetic alloy that is capped except for the root plate side of the magnet structure,
The projection is joined to the side surface of the case, and when embedded in the denture base, the projection is sealed in the denture base and mechanically engaged.

[0007]

In the magnetic attachment for a denture according to the present invention, when embedded in the denture base, the protrusions joined to the side surfaces of the case are sealed in the denture base and mechanically engage with each other.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a magnetic attachment for a denture, which is embedded in a denture base so as to face a root plate or a keeper made of a soft magnetic alloy embedded in a tooth root, as an embodiment of the present invention will be described with reference to FIGS. It will be described based on 4. (Embodiment 1) As shown in FIG. 1, the structure of a magnetic attachment for a denture according to Embodiment 1 of the present invention includes a magnet structure 1 attracted to a root plate (not shown) and a root of the magnet structure 1. The case 2 is made of a corrosion-resistant non-magnetic alloy and is capped with the exception of the attracting surface 14 on the face plate side, and the protrusion 3 joined to the side surface 20 of the case 2.

The magnet structure 1 includes a plate-shaped magnet 10 having magnetic poles parallel to the attracting surface 14, soft magnetic yokes 11 and 12 that sandwich the magnet 10 from both sides, and an attracting surface 14 side of the magnet 10. A spacer 13 made of a corrosion-resistant non-magnetic alloy that covers the surface and is isolated from the external environment. The magnet structure 1 is a yoke 1
Since 1 and 12 guide the magnetic flux (not shown) emitted from the magnet 10, a relatively strong magnetic attraction force is exerted. Adsorption surface 14
The joints of the yokes 11 and 12, the spacer 13, and the opening end 21 of the case 2 capped with the magnet structure 1 which are exposed in FIG. 1 are precisely sealed by electron beam welding or laser welding. Saliva will not enter inside. In addition, the magnet structure 1 is not limited to the above-described type, and may be another type as long as the denture can be fixed by a magnetic attraction force.

On the other hand, as shown in FIGS. 1 and 2, the protrusion 3 joined to the side surface 20 of the case 2 covers the suction surface of the case 2 and the back-facing surface facing the back surface, and covers the middle of the side surface 20. It is formed by raising the outer peripheral edge of the crowned thin plate 30. The thin plate 30 is made of stainless steel, which is a non-magnetic corrosion resistant alloy, and is firmly joined by laser welding over the entire circumference of the side surface 20 of the case 2.

When the magnetic attachment for a denture having the above-described structure is embedded in the denture base, the protrusions 3 provided all around the side surface 20 are sealed in the denture base and mechanically engage with each other. Therefore, the magnetic attachment for denture is fixedly held in the denture base with a higher fixing force than that obtained by the conventional adhesive alone. As a result of measurement with a tensile tester, the tensile force required to pull out the magnetic attachment for denture of this example from the denture base was 49 [kg].
f].

(Embodiment 2) As shown in FIG. 3, a magnetic attachment for a denture according to Embodiment 2 of the present invention includes a case 2 made of a corrosion-resistant non-magnetic alloy capped on a magnet structure (not shown). , The protrusion 3 joined to the side surface 20 of the case 2. The magnet structure has the same structure as that of the first embodiment, but is not limited to this structure.

On the other hand, the protrusions 3 joined to both sides of the side surface 20 of the case 2 stand on the outer peripheral edge of the thin plate 31 which covers the adsorption surface of the case 2 and the back-facing surface which faces the back, and which covers the middle of the side surface 20. It is formed by raising. The thin plate 31 is made of titanium, which is a non-magnetic corrosion resistant alloy, and its joint surface with the case 2 is firmly joined with a metal adhesive. When the magnetic attachment for a denture having the above-mentioned configuration is embedded in the denture base, since the two protrusions 3 are enclosed in the denture base and mechanically engaged,
Magnetic attachments for dentures are fixedly held in the denture base with a higher anchoring force than with conventional adhesives alone. The tensile force required to pull out the magnetic attachment for a denture of this example from the denture base was 52 [kgf] as a result of measurement by a tensile tester.

(Embodiment 3) As shown in FIG. 4, a magnetic attachment for a denture according to Embodiment 3 of the present invention has a case 2 made of a corrosion-resistant non-magnetic alloy capped on a magnet structure (not shown). , The protrusion 3, which is joined to the side surface 20 of the case 2,
3 and 3. The magnet structure has the same structure as that of the first embodiment, but is not limited to this structure.

On the other hand, the protrusions 3 joined to both sides of the side surface 20 of the case 2 are formed by joining a thin plate made of 14K gold alloy to the middle of the side surface 20 of the case 2 by brazing. When the above-mentioned magnetic attachment for a denture is embedded in the denture base, the two protrusions 3 and 3 are sealed in the denture base and mechanically engage with each other, so that the denture base has a higher fixing force. Holds fixed. As a result of measurement with a tensile tester, the tensile force required to pull out the magnetic attachment for denture of this example from the denture base was 46 [kgf].

Instead of forming the protrusion 3 by a thin plate joined to the side surface, a part of the side surface 20 of the case 2 may be partially expanded to form the protrusion. (Comparative Examination of Examples) Table 1 shows a list of specifications of Examples 1 to 3 described above. The tensile force in this table is the tensile force required to pull out the magnetic attachment for denture from the denture base, measured by a tensile tester. In any of the examples, it is necessary to pull out a tensile force that is several tenths larger than the conventional magnetic attachment for a denture (see FIG. 6) that does not have a protrusion that engages in the denture base, and the present invention is effective. Is shown. By the way, the conventional one could be pulled out with a tensile force of thirty and several [kgf].

The evaluation of corrosion resistance is described at the end of this table, which is evaluated by the degree of discoloration of appearance after being immersed in artificial saliva at 37 ° C. for 1000 hours. As a result, all were judged to be excellent without discoloration.

[0018]

[Table 1] (Note 1) 17Cr-12Ni-2Mo stainless steel

[0019]

As described above in detail, according to the magnetic attachment for a denture of the present invention, the protrusions joined to the side surfaces are mechanically engaged in the denture base, so that the magnetic attachment for the denture is more firmly attached. Has the effect that it can be fixed in the denture base. The fixing force provided by the mechanical engagement can firmly fix the magnetic attachment for denture in the denture base regardless of deterioration of the adhesive due to long-term use.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a magnetic attachment for artificial teeth of Example 1.

FIG. 2 is a perspective view of the magnetic attachment for denture according to the first embodiment.

FIG. 3 is a perspective view of a magnetic attachment for artificial teeth according to a second embodiment.

FIG. 4 is a perspective view of a magnetic attachment for artificial teeth according to a third embodiment.

FIG. 5 is a cross-sectional view showing a mounted state of a magnetic attachment for artificial teeth.

FIG. 6 is a perspective view of a conventional magnetic attachment for artificial teeth.

[Explanation of symbols]

1: Magnet structure 2: Case 20: Side surface 3: Protrusions 30, 31: Thin plate

Claims (1)

[Claims] 1. A magnetic attachment for a denture, which is embedded in a denture base so as to face a root plate made of soft magnetic matching metal embedded in a tooth root portion, the magnetic attachment being a magnetic structure attracted to the root plate. And a case made of a corrosion-resistant non-magnetic alloy that is capped except for the root plate side of the magnet structure, and a protrusion joined to a side surface of the case, and when embedded in a denture base, A magnetic attachment for a denture, characterized in that the protrusion is enclosed in the denture base so as to be mechanically engaged.