JP2002078720A - Mounting structure of keeper for denture attachment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mounting structure of a keeper for a denture attachment which structurally enhances the attraction force of the denture attachment and is mountable to an implant with high tightening force. SOLUTION: The keeper 10 comprises a keeper body part 13 having an attraction surface 12 and a shaft part 15 disposed on the surface on the side opposite to the attraction surface 12. The keeper body part 13 has a flat surface 14 for engaging a rotary tool on its outer periphery and is provided with the attraction surface 12 on the flat surface free of the ruggedness. The implant 4 has a mounting hole 435 screwable to the shaft part 15. A ring member 2 is interposed between the keeper body part 13 and the implant 4 and the shaft part 15 of the keeper 10 is screwed to the mounting hole 435 of the implant 4, by which the keeper 10 is mounted at the implant 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an attachment structure for attaching a keeper for a denture attachment to an implant fixed to an edentulous jaw.

[0002]

2. Description of the Related Art In the field of dentistry, a denture attachment for fixing a denture in an oral cavity by using magnetic attraction is being developed. The denture attachment is composed of a combination of a magnet device disposed on the denture side and a soft magnetic keeper disposed in the oral cavity.

[0003] If no root remains in the oral cavity,
A technique of embedding a keeper fixing member called an implant in a so-called edentulous jaw and arranging the keeper therein is used. As a conventional method of attaching a keeper to an implant, for example, there is a method disclosed in Japanese Patent Application Laid-Open No. Hei 6-296625. FIG. 4 shows the mounting structure shown in this method.

As shown in FIG. 1, in this prior art, an implant 3 which is a combination of a fixture 31 and an abutment 32 is used, and the fixture 31 is used.
The shaft portion 915 of the keeper 91 is directly screwed into the mounting hole 315 provided in the
Attach to 15. At this time, the keeper 91 is rotated by engaging a driver with a driver insertion groove 911 provided on the suction surface 910 and rotating the driver.

FIG. 3 shows a mounting structure disclosed in Japanese Patent Application Laid-Open No. 2000-24004. As shown in the figure,
In this conventional technique, an implant 4 formed by combining a fixture 41, an abutment 42, and an abutment screw 43 is used. The keeper 92 is a combination of a keeper body 921 and a screw 922 separately disposed at the center thereof. Then, an engagement hole 415 provided in the fixture 41 is provided.
Then, the abutment screw 43 is screwed, and the shaft portion 925 of the screw portion 922 of the keeper 92 is screwed into the mounting hole 435 of the abutment screw 43.
At this time, the rotation of the screw portion 922 is
This is performed by engaging a driver with a driver insertion groove 924 provided in the motor 23 and rotating the driver.

[0006]

In any of the conventional mounting structures, it is necessary to provide a groove for engaging a driver for rotating and screwing the keeper on the suction surface of the keeper. However, the formation of the engaging groove on the attraction surface of the keeper directly affects the attraction force with the magnet device attracting to the attraction surface. That is, since the engagement groove forming portion cannot contact the magnet device, the effective area of the suction surface of the keeper decreases. Further, there is a problem that the tightening by the screwdriver can easily crush the ridges around the engagement groove. Therefore, strong clamping force cannot be given.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has a structure in which a suction force of a denture attachment is structurally enhanced and can be mounted on an implant with a strong tightening force. It is intended to provide.

[0008]

According to a first aspect of the present invention, there is provided an attachment structure for attaching a keeper for a denture attachment to an implant fixed to an edentulous jaw, wherein the keeper is for adsorbing a magnet device provided on the denture. A disk-shaped keeper main body having a suction surface, and a shaft portion having a male thread disposed on a surface of the keeper main body opposite to the suction surface, and an outer periphery of the keeper main body is provided. The implant has at least two flat surfaces for engaging with a rotating tool, the suction surface is provided on a flat surface without irregularities, and the implant has a mounting hole having an internal thread which can be screwed with the shaft. A ring member having an outer diameter smaller than the outer diameter of the keeper body and an inner diameter larger than the outer diameter of the shaft is interposed between the keeper body and the implant; The shaft portion is in the mounting structure of the keeper for a dental attachment characterized by comprising attaching the keeper to the implant by screwing the mounting hole of the implant.

The most notable point in the present invention is that at least two flat surfaces are provided on the outer periphery of the keeper body, and the suction surface is provided on a flat surface having no irregularities. And the ring member having the specific size described above is interposed therebetween. In addition,
As the structure of the implant, various structures such as a combination of a fixture and an abutment or a structure of a combination of an abutment screw can be adopted.

Next, the operation and effect of the present invention will be described.
In the mounting structure of the present invention, first, the outer periphery of the keeper body has at least two flat surfaces for engaging with the rotary tool. When the keeper is fixed to the implant, a rotating tool is engaged with a flat portion on the outer periphery of the keeper and rotated. That is, the tool is brought into contact with the portion of the keeper having the largest outer diameter to rotate the keeper.
As a result, a stronger rotational moment can be applied even with a weaker force than when the tool is engaged with the engaging groove provided on the suction surface of the conventional keeper, and the keeper is damaged. It is possible to secure a stronger tightening force than before.

Further, the suction surface of the keeper body is provided in a flat state without any unevenness without providing any engagement groove with the tool. Therefore, the effective area of the suction surface of the keeper is not reduced structurally. Therefore, the keeper of the present invention can more easily improve the suction force structurally than the keeper of the conventional mounting structure.

Further, the ring member having the specific shape is interposed between the keeper body and the implant. Since this ring member has an outer diameter smaller than the outer diameter of the keeper body, it does not hinder the engagement of the rotary tool with the keeper body. Further, since the inner diameter of the ring member is larger than the shaft of the keeper, the rotation of the keeper is not hindered. Then, by the interposition of the ring member, the keeper can be brought into contact with the implant in a uniform state and tightened and fixed. Further, since friction surfaces are formed on both the upper surface and the lower surface of the ring member, loosening can be suppressed. Therefore, together with the improvement of the tightening force, the mounting structure of the keeper to the implant can be further stabilized.

As described above, according to the present invention, it is possible to provide an attachment structure for a keeper for a denture attachment, which can structurally increase the attraction force of the denture attachment and can be attached to the implant with a strong tightening force.

Next, it is preferable that the outer periphery of the keeper body be provided in a polygonal shape. Thereby, the rotating tool can be easily engaged.
Note that the polygonal shape is 6
Although it may be rectangular, an octagon or a shape having more corners is more preferable. As the number of corners increases, the shape becomes closer to a circle, and an effective attraction area can be easily secured when the magnet structure is a circle.

Further, as in the third aspect of the present invention, it is preferable that the attraction surface of the keeper body is provided in such a shape that the entire attraction surface of the magnet device contacts. That is,
For example, by making the outer shape of the attraction surface of the keeper body larger than the attraction surface of the magnet device, the entire attraction surface of the magnet device can be brought into contact with the attraction surface of the keeper body portion.
As a result, the magnetic properties of the magnet device can be fully exhibited, and an excellent attraction force can be secured.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 An attachment structure of a keeper for a denture attachment according to an embodiment of the present invention will be described with reference to FIG. As shown in FIG. 1, the attachment structure of the denture attachment keeper of this embodiment is an attachment structure for attaching the denture attachment keeper 10 to the implant 4 fixed to the edentulous jaw.

As shown in FIG. 1, the keeper 10 has a disk-shaped keeper body 13 having an attraction surface 11 for attracting a magnet device 6 (FIG. 2) provided on a denture, and a keeper body. 13 comprises a shaft portion 15 having a male thread disposed on a surface 12 opposite to the suction surface 11. Eight flat surfaces 14 for engaging with a rotary tool are provided on the outer periphery of the keeper body 13. That is, the outer circumference of the keeper body 13 is 8
It was provided in a square shape. The suction surface 11 was provided on a flat surface without irregularities. The keeper 10 is made of a magnetic material.
It was composed of a steel material containing 9% Cr, 2% Mo, and 0.2% Ti.

As shown in the figure, an implant 4 was used in which an abutment 42 was placed on a fixture 41 and this was fixed with an abutment screw 43. The abutment screw 43 is used for the fixture 4
The entire implant 4 is fixed by screwing the shaft portion 434 into one engagement hole 415. In addition, the abutment screw 43 has a mounting hole 435 having a female screw thread that can be screwed with the shaft portion 15 of the keeper 10.

Further, a ring member 2 to be interposed between the keeper body 13 and the implant 4 is prepared. The ring member 2 has an outer diameter smaller than the outer diameter of the keeper body 13 and an inner diameter larger than the outer diameter of the shaft 15. SUS316L was used as this ring member.

In attaching the keeper 10 to the implant 4, the ring member 2 is interposed between the keeper body 13 and the implant 4, and the keeper 1
The 0 shaft 15 is screwed into the mounting hole 435 of the implant 4. Thereby, the keeper 10 is attached to the implant 4. At this time, the keeper 10 is fixed by engaging a dedicated wrench or other tool with the flat surface 14 on the outer periphery thereof and performing rotation for screwing.

Next, the operation and effect of this embodiment will be described. The mounting structure of the present embodiment has eight flat surfaces 14 on the outer periphery of the keeper body 10 for engaging with a rotary tool. When the keeper 10 is fixed to the implant 4, a rotating tool is engaged with the flat portion 14 on the outer periphery of the keeper 10 and rotated. That is, the tool is brought into contact with the portion of the keeper 10 having the largest outer diameter to rotate the keeper 10. Therefore, a stronger rotational moment can be applied with a smaller force than when the tool is engaged with the engaging groove provided on the suction surface of the conventional keeper and the keeper is rotated. A stronger tightening force can be secured.

Also, the suction surface 11 of the keeper body 10
Is provided in a flat state without any unevenness without providing any engagement groove with the tool. Therefore, the effective area of the suction surface 11 of the keeper 10 is not reduced structurally. Therefore, the keeper 10 of the present embodiment can more easily improve the suction force structurally than the keeper of the conventional mounting structure.

Further, the ring member 2 having the specific shape is interposed between the keeper body 10 and the implant 4. Since the ring member 2 has an outer diameter smaller than the outer diameter of the keeper body 10, it does not become an obstacle when the rotary tool is engaged with the keeper body 10. Further, since the inner diameter of the ring member 2 is larger than the shaft portion 15 of the keeper 10, it does not hinder the rotation of the keeper 10. Then, by the interposition of the ring member 2, the keeper 10 can be brought into contact with the implant 4 in a uniform state and tightened and fixed. In addition, since friction surfaces are formed on both the upper surface and the lower surface of the ring member 2, loosening can be suppressed. Therefore, together with the improvement of the tightening force, the mounting structure of the keeper 10 to the implant can be further stabilized.

Embodiment 2 In this embodiment, in order to quantitatively clarify the effectiveness of the same mounting structure as in the first embodiment, the conventional mounting structure and the suction force,
The evaluation was made by comparing three items of tightening force and tightenability. First, a magnet device 6 was prepared as shown in FIG. 2 to evaluate the attraction force. The magnet device 6 includes a fixed case 61
And a bottom plate 62 with a built-in magnet 60. The fixed case 61 and the bottom plate 62 are fixed by welding a welded portion 625. As shown in Table 1, two types of magnet devices 6 were prepared.

As the mounting structure similar to that of the first embodiment, two types of mounting structures (Examples 1 and 2) in which the outer dimensions of the keeper 10 are changed are prepared. Further, as the conventional structure, two types (Comparative Examples 1 and 3) in which the dimensional relationship was changed in the above-described structure of FIG. 3 and one type (Comparative Example 2) of the structure of FIG. Table 1 shows the dimensions, materials, and the dimensions of the magnet device adsorbed on each of the examples and comparative examples. In Table 1, the name of each part is a screw part having a screw function (shaft part) in the keeper part, and a ring part fixed to the implant by the screw part.

The suction force of the evaluation item was measured under the conditions of a tension rate of 0.5 mm / min after attaching a load cell to the autograph and fixing the sample with a special jig. The tightening force was measured with a torque wrench when the keeper was tightened by a driver (comparative example) or a spanner (example) until the keeper was damaged. Also,
Tightening performance is indicated by ○ when the operation of smoothly inserting the shaft part of the screw part into the mounting hole on the implant side and tightening is performed, and x when the operation cannot be performed smoothly. This item is based on the operator's feeling. evaluated.

Table 1 also shows these results. As can be seen from Table 1, the mounting structures according to the first and second embodiments of the present invention are shown.
Was superior to Comparative Examples 1 to 3 having the same dimensions in all of the suction force, the tightening force, and the tightening property, and was found to be a very excellent mounting structure.

[0028]

[Table 1]

[0029]

As described above, according to the present invention, it is possible to provide a structure for mounting a keeper for a denture attachment, which can structurally increase the attraction force of the denture attachment and can be attached to the implant with a strong tightening force. it can.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a mounting structure of a denture attachment keeper according to a first embodiment.

FIG. 2 is an explanatory diagram showing a structure of a magnet device used in a second embodiment.

FIG. 3 is an explanatory view showing a mounting structure of a keeper for a denture attachment in a conventional example.

FIG. 4 is an explanatory view showing an attachment structure of a keeper for a denture attachment in a conventional example.

[Explanation of symbols]

 1. . . 9. Mounting structure of keeper for denture attachment, . . Keeper, 11. . . Adsorption surface, 13. . . 13. Keeper body; . . 14. flat surface, . . Shaft, 2. . . Ring member, 3,4. . . Implants, 31, 41. . . Fixture, 32, 42. . . Abutment, 43. . . Abutment screw, 315, 435. . . Mounting holes,

Claims (3)

[Claims] 1. A mounting structure for attaching a keeper for a denture attachment to an implant fixed to an edentulous jaw, wherein the keeper has a disc-shaped keeper having an attraction surface for attracting a magnet device disposed on the denture. A flat portion for engaging a rotary tool on an outer periphery of the keeper body portion, the shaft portion having a male thread provided on a surface of the keeper body portion opposite to the suction surface; The implant has at least two surfaces, the suction surface is provided on a flat surface without irregularities, and the implant has a mounting hole having a female screw thread that can be screwed with the shaft portion. A ring member having an outer diameter smaller than the outer diameter of the keeper body and an inner diameter larger than the outer diameter of the shaft is interposed between the implant and the implant. A keeper mounting structure for a denture attachment, wherein the keeper is mounted on the implant by screwing the keeper into a mounting hole of the garment. 2. The attachment structure for a denture attachment keeper according to claim 1, wherein an outer periphery of said keeper body is provided in a polygonal shape. 3. The attachment structure for a keeper for a denture attachment according to claim 1, wherein the attraction surface of the keeper body is provided in a shape in which the entire attraction surface of the magnet device contacts. .