JPH07213539A - Root surface parts for securing denture - Google Patents

Abstract

PURPOSE:To provide root surface parts for securing a denture in place, enabling an accurate diagnostic check without causing disturbance of images produced by MRI. CONSTITUTION:Root surface parts for securing a denture in place comprises a body 1, made of non-magnetic material, embedded in the root of a tooth, and a holder plate, made of soft magnetic material, installed on the edge surface of the body on the opposite side of a permanent assembly embedded in the denture base; the holder plate is fitted to a recess 10 formed on the edge surface of the body 1, having a female screw 11 penetrating through the side thereof, by turning a male screw into the female screw.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a denture stabilizing root member for use in a prosthetic method for holding a denture by utilizing 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 Sustaining Device Using Rare Earth Magnet for Osseo Integrated Implant, Oral Maxirofacial Implant, Vol. 1 (1987), No. 2, pp. 77-89 ”.

FIG. 3 is a longitudinal cross-sectional view of the essential parts showing an example of artificial tooth fixing means utilizing the magnetic attraction of a permanent magnet. In FIG. 3, 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 longitudinal cross section of, for example, a T shape and is embedded in the tooth root 2. Reference numeral 3 denotes a holding plate, which is formed in a disk shape from corrosion-resistant magnetic stainless steel such as SUS447J1 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 configuration, a magnetic attractive force acts between the permanent magnet assembly 6 and the root member 1, and the denture base 4 is pressed against the root 2 by this magnetic attractive force, so that 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. When using MRI (Magnetic Resonance Diagnostic Device), there is a problem that an accurate diagnosis cannot be performed 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 with the root member 1 by casting or welding, it cannot be easily removed. Therefore, there is a problem that an individual who applies the artificial tooth fixing means using 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.
An object of the present invention is to provide a denture stabilizing root member 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 an end face facing a permanent magnet assembly embedded in a denture base. In a root member for stabilizing a denture, a holding plate made of a soft magnetic material is provided on (1) a concave hole having a finger screw penetrating the side surface is provided at an end portion of the main body, and the holding plate is screwed into the screw for penetrating the holding plate. It is fixed to the recessed hole by the attached male screw, or (2) the inner end of the main body is provided with a recessed hole having semicircular arcs on both sides, and the retaining plate having semicircular arcs on both sides is provided in the concave hole. A technical means of mounting and fixing a rod member having a shape such as a circle or a corner in the formed arc portion was adopted. In the case of the above (1), the holding plate can be removed by rotating and removing the male screw. Further, in the case of the above (2), the holding plate can be removed by removing the rod member.

[0008]

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

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a longitudinal sectional view of a main part showing a first embodiment of the present invention. In FIG. 1, reference numeral 10 is a recessed hole, which is provided at the end of the root member 1 and has a screw 11 for penetrating the side surface. With the above configuration, when holding a denture base (not shown), as shown in FIG. 3, the holding plate 3 is attached to the recessed hole, and a male screw (not shown) screwed to the screw for penetrating is provided. Sticks by rotation. When the holding plate 3 is removed, the male screw may be rotated and removed in the opposite direction by a driver. 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 a main part showing a second embodiment of the present invention. In FIG. 2, reference numeral 13 denotes a concave hole formed on both sides of the inner surface in a semi-arcuate shape. A holding plate 3 having both side surfaces formed in a semi-arcuate shape is attached to the concave hole, and a circular or square shape is formed on the formed arc portion. The rod 14 having the above shape is inserted and fixed. When removing the holding plate 3, the rod 14 may be removed and removed. In the present embodiment, the space formed by the concave hole and the holding plate has been described as an arc shape, but it goes without saying that it may be an ellipse or other non-circular shape. In the above embodiment, the holding plate 3 having a circular outer contour has been described, but it goes without saying that it may be an ellipse or other non-circular shape.

[0011]

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 a longitudinal sectional view of a main part showing a first embodiment of the present invention.

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

FIG. 3 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 surface member, 3 holding plate, 10 concave hole, concave 13 concave hole

Claims (2)

[Claims] 1. A root member for stabilizing a denture, wherein 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 surface facing a permanent magnet assembly embedded in a denture base. In the above, a root surface for stabilizing a denture, characterized in that a concave hole having a screw for penetrating a side surface is provided at an end of the main body, and the holding plate is attached to the concave hole by a male screw screwed to the screw for penetrating. Element. 2. A root plate member for stabilizing a denture, wherein 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 surface facing a permanent magnet assembly embedded in a denture base. At the end of the main body, a concave hole having semicircular arcs formed on both sides of the inner surface is provided, and a holding plate having semicircular arcs on both sides is mounted in the concave hole, and a bar material is inserted into the circular arc part formed. A root surface member for stabilizing a denture, which is characterized in that