JP4126641B2 - Keeper mounting structure on inner crown - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a keeper mounting structure for mounting a keeper, which is a component of a magnetic attachment used for a denture, to an inner crown. A magnetic attachment is a maintenance device that uses the force of a magnet to connect a removable denture to an abutment tooth to maintain and stabilize it. As a prosthetic terminology, a magnetic attachment is defined as a maintenance device for a prosthesis using a magnetic force, which is composed of a magnet structure and a keeper. The structure of the magnetic attachment includes a magnet structure including a permanent magnet body and a keeper that is attracted to the magnet structure. Basically, the magnet structure is coupled to the prosthesis, and the keeper is coupled to the teeth and roots, and functions as a maintenance device for the prosthetic bump by the magnetic attraction force of both. FIG. 6 schematically shows the functional principle of the magnetic attachment.
[0002]
[Prior art]
As shown in FIG. 7, the conventional keeper is attached to the inner crown by wax-up with a keeper made of magnetic stainless steel having a flat cylindrical structure positioned horizontally, and then a mold. It is formed so as to be embedded in the upper part of the inner crown obtained by casting while maintaining the position of the keeper, and is finished so that the upper surface of the keeper and the upper end of the inner crown are flush with each other.
[0003]
The above-mentioned keeper before casting has a top surface that is finished with high precision at the time of product shipment, and strongly adsorbs to the magnet structure with a permanent magnet body, which is another component of the magnetic attachment. Shaped to get.
However, the keeper held in a state of being fitted to the inner crown by the casting method receives heat shrinkage stress at the lower part of the keeper when the inner crown is thermally contracted, and the upper surface of the keeper is bent into a curved surface (see FIG. 7). The adsorption ability with the magnet structure is significantly attenuated and cannot play the role of a keeper.
[0004]
In addition, in the keeper mounting structure by the casting method, an oxide film is formed on the upper surface of the keeper due to heating during casting, which has the disadvantage of having to be removed by polishing, thereby reducing the adsorption capacity. It becomes.
[0005]
The present invention has been made in view of the above points, and the object of the present invention is to maintain a factory-finished state that is smoothly finished without causing deflection due to heat shrinkage to the keeper upper surface, and to maintain the upper surface of the keeper. In contrast , the keeper can be fixed directly in the oral cavity (even after several years) after cementing the inner crown part first in the oral cavity without forming an oxide film. Another object of the present invention is to provide a structure for attaching a keeper to an inner crown that can be firmly fixed to a recess-shaped receiving portion by an adhesive for use and that is difficult for the dental adhesive to be detached from the recess-shaped receiving portion .
[0006]
The keeper mounting structure to the inner crown according to the present invention is formed by integrally forming a recess-shaped receiving portion with the same material on the upper portion of a noble metal inner crown made to fit inside the denture. the inner surface of the parts are the same size top, is formed from the middle of the inner surface tapered structure in which the lower is Ru are wider toward the back, keeper flat cylinder shape for accommodating the said receiving portion except the top surface An undercut or groove shape is formed in the middle of the outer peripheral side surface or at the lower part of the outer peripheral side surface, or a concave shape or a foot structure is formed on the bottom surface of the keeper to form a wide adhesive area with the dental adhesive, It is characterized by firmly fixing the adhesion to the keeper .
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing the integration of a keeper 1 in which a catching portion 1 a such as a recess, groove or notch is formed by a direct bonding method and a recess-shaped receiving portion 2 a formed in the upper portion of the inner crown 2. Keeper Figure 2 on the outer peripheral side surface of the 1 (a) ~ (d) are shown as undercut, recess shape, groove shape, firmly by dental adhesive 3 is formed in a shape 1c to increase the adhesion area, such as the foot structure Make sure to fix.
[0013]
The keeper 1 uses a magnetic structure (not shown), which is a component of a magnetic attachment (not shown), and a magnetic body, such as magnetic stainless steel SUS447J1, which is a material to be adsorbed. The shape of flat cylinder shape the outer peripheral side surface of the keeper 1 as shown in for example FIG. 2 (a) ~ (d) , the keeper 1 for direct bonding with catching portion 1a forms the inner crown 2 upper It is set as the shape which can be joined in the state fitted to the shape of the recessed receiving part 2a. The inner surface of the recess-shaped receiving part 2a is formed so that the upper part has the same diameter and the lower part is directed deeper. The keeper 1 is directly bonded to the concave receiving portion 2a at the upper part of the inner crown 2 with a dental adhesive 3 such as dental cement.
[0014]
The thickness of the keeper 1 is usually about 1 mm, but it is possible to change the thickness as appropriate depending on the place of use. In the present embodiment, a case where an undercut is formed as shown in FIG. 2 (a), for example, as a shape 1c for widening the bonding area for causing firm fixation to the lower part 1/2 of the outer peripheral side surface of the keeper 1 for direct bonding. Although shown, it is not necessarily limited to these shapes.
[0015]
The inner crown is made into a shape that fits inside a denture (not shown), and is made by a casting method using a material such as a gold alloy in consideration of workability. The inner crown 2 is also called a root face plate. In this example, a cylindrical shape is shown, but the shape is not necessarily limited to this shape. For example, the shape may be a substantially T-shaped cross section.
[0016]
In the direct bonding method, it is important to match the joint portion between the inner crown 2 and the keeper 1 as much as possible. As a method for this, the receiving portion 2a formed on the upper portion of the inner crown 2 is provided with a recess-shaped plastic keeper housing 4 which can be incinerated during casting on wax corresponding to the inner crown shape, and the inner crown 2 and the recessed receiving portion. By integrally casting 2a with a noble metal, it is integrally formed.
[0017]
The concave receiving portion 2a formed on the upper portion of the inner crown 2 is formed when the concave plastic keeper housing 4 is placed on the wax corresponding to the inner crown shape in the tooth meshing direction. This is performed by using a keeper housing setter 5 which is a jig that is movable in the vertical direction and has a keeper housing fitting portion 5a that can be fixed on the same plane in a certain vertical direction. Although a table capable of adjusting the angle, which is not shown in FIG. 4, is installed on the surveyor, the tooth model is fixed to the table, and the plastic keeper housing 4 is mounted on the wax corresponding to the shape of the corresponding tooth. It is to make. As shown in FIG. 4, after the plastic keeper housing 4 is lowered in the correct direction and fixed on the wax for the lower inner crown, the keeper housing setter 5 is raised to raise the plastic keeper housing 4. Just leave it on the wax.
[0018]
In order to position the concave shape plastic keeper housing 4 for forming the concave receiving portion 2a formed on the upper portion of the inner crown 2 in a plane perpendicular to the plane for meshing, the keeper housing setter 5 is used to make the plastic keeper. By positioning the housing 4 on the upper part of the wax waxed up to the shape corresponding to the inner crown, fixing, and casting, the inner crown 2 with the concave receiving portion 2a for attaching the keeper can be produced.
[0019]
Two methods are used as a method of fixing the keeper 1 to the inner crown 2 having the concave receiving portion 2a for attaching the keeper with a dental adhesive 7 such as a dental adhesive cement for directly bonding the keeper 1.
In the first method, after the inner crown is manufactured, the bonding keeper is directly fixed and used in the same manner as a normal casting method.
In the second method, when the inner crown with the keeper mounting receiving part is attached to the oral cavity as it is and the maintenance force of the magnetic attachment is required afterwards (may be several years later), the keeper is attached with adhesive cement in the oral cavity. Use tools to secure parallel to the mating plane.
[0020]
To keep the keeper accurately in the recess-shaped receiving part formed in the upper part of the inner crown and fix the keeper in the oral cavity using dental adhesive, the part corresponding to the tooth is provided with a rubber block, and the part corresponding to the keeper This is accomplished by using a mounting tool with a handle with a glass surface.
[0021]
When the magnet structure is mounted in the outer crown with the keeper-equipped inner crown fixed by the keeper direct bonding method, it can be fixed by the usual method.
[0022]
【The invention's effect】
In the present invention, as can be seen from the above description, the keeper for direct bonding is fixed to the upper portion of the inner crown with a dental adhesive such as adhesive cement without using the casting method as in the prior art. In addition, there is no deflection due to heat shrinkage on the upper surface, and the factory-finished state can be maintained smoothly and the adsorbing ability with the adsorbing body, which is a magnet structure, is not reduced.
In addition, in the present invention, the inner surface of the recess-shaped receiving part has the same diameter at the top and is widely formed with the lower part facing away from the back, so that the dental adhesive is not easily detached from the recess-shaped receiving part. In addition, since the hooked portion such as an undercut, a hollow shape, a groove shape, or a foot structure is formed on the outer peripheral side surface of the keeper, the keeper can be firmly fixed to the concave receiving portion by the dental adhesive.
[0023]
In addition, since it is not based on the casting method, an oxide film is not formed on the upper surface of the keeper, and it is free from troublesome and difficult polishing and flat finishing .
[0024]
Since the keeper is directly bonded to the concave receiving portion at the upper part of the inner crown by a dental adhesive such as dental cement that does not depend on the casting method, the disadvantages caused by the conventional casting method are solved at once. Since problems such as distortion caused by thermal effects on the keeper body are eliminated, the adsorption ability between the keeper and the magnet structure is not affected.
[0025]
In the conventional method, when the inner crown is installed in the oral cavity, the keeper is fixed to the inner crown, which is expected to require maintenance force, so many keepers must be installed in the oral cavity, but the keeper is fixed. Since no inner crown can be installed in the oral cavity, a keeper can be attached to a site (tooth) requiring maintenance force and a magnet structure can be installed, so that the minimum number of keepers can be used in the oral cavity.
For this reason, the influence on imaging such as MRI is reduced.
[0026]
Conventionally, there are screw-type keepers and the like that can be removed and attached to the keeper, but it is very inefficient and clinically insufficient. By using an adhesive cement solvent, the keeper can be removed and reattached.
[0027]
When removing an inner crown keeper by the keeper casting method during MRI photography etc., there was only a method of scraping the keeper or removing the entire inner crown, but this method cannot be restored again. It was close to possible. However, it can be removed and attached in the direct bonding method.
[Brief description of the drawings]
FIG. 1 shows an embodiment of the present invention, and is an explanatory view showing integration of a keeper and an inner crown by a mounting structure for directly bonding the keeper to the inner crown.
FIG. 2 is a side view ( ad ), a perspective view ( eh ) , and a bottom view ( i ) showing the shape and type of a keeper for direct bonding according to the present invention.
FIG. 3 is a side view showing the shape and type (taper type and straight type) of a concave plastic keeper housing used for a keeper.
FIG. 4 is a schematic explanatory view of a plastic keeper housing attachment device used for a keeper.
FIG. 5 is a schematic explanatory view of a keeper attachment tool used as a keeper intraoral setter.
FIG. 6 is a schematic diagram showing the functional principle of a magnetic attachment.
FIG. 7 is an explanatory view showing a keeper mounting method by a conventional casting method.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Keeper 1a Entrapment part 2 Inner crown 2a Recessed receiving part 3 Dental adhesive 4 Recessed plastic keeper housing 5 Keeper housing setter 5a Keeper housing fitting part

Claims (1)

A recess-shaped receiving part is integrally formed of the same material on the upper part of a noble metal inner crown made to fit inside the denture , and the inner surface of the receiving part has the same diameter at the upper part and is in the middle of the inner surface A flat cylindrical keeper that is formed in a tapered structure with the lower part gradually widening from the bottom, and an undercut or groove shape is formed on the outer peripheral side or the lower part of the outer peripheral side except the uppermost surface, or the keeper A keeper attachment to the inner crown characterized by forming a concave shape or a foot structure on the bottom surface to form a wide bonding area with the dental adhesive and firmly fixing the adhesion between the inner surface of the receiving portion and the keeper Construction.

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