JP4284397B2 - Abutment for magnetically attaching a prosthesis to an implant and method for manufacturing the same - Google Patents

Description

  The present invention relates to an abutment for magnetically attaching a prosthesis to an implant and a method for manufacturing the abutment. More specifically, in an abutment in which a prosthesis such as a denture can be detachably attached to an implant embedded in a jawbone or the like, the upper side which is a portion protruding from the gingiva of the abutment body is narrowed upward. The present invention relates to a device that is formed so as to have a round shape, so that the prosthesis can be easily attached and detached, and the prosthesis can be attached in close contact.

  An abutment provided with a magnetic body (keeper) is fixed to an implant embedded in the jawbone, etc., and the denture is attached to the implant in a removable manner by magnetizing the magnet provided on the denture on the magnetic body. Technology has been developed. As an abutment used at this time, for example, there is one disclosed in Patent Document 1.

  In Patent Document 1, a concave pocket 90 is formed in an upper portion, and a substantially cylindrical abutment 9 in which a magnetic body 91 is fitted in the pocket 90 (Patent Document 1 includes a “dental magnetic member holder”). Is described under the name of "." In the abutment 9, the surfaces of the pocket 90 and the magnetic body 91 that are in contact with each other are formed to have a rotatable spherical shape. Therefore, according to this abutment 9, even when the implant 8 is embedded in an oblique direction with respect to the jaw bone or the like, the magnetic body 91 is moved along the inner surface of the pocket 90 to adjust the upper surface to a substantially horizontal state. be able to. Thereby, it is possible to prevent the force from being biased to the implant 8.

JP 11-244308 A

However, the abutment 9 described above has the following problems.
According to the abutment 9 described above, the magnetic body 91 can be moved along the inner surface of the pocket 90 to keep the upper surface in a substantially horizontal state so that no force is applied to the implant 8. However, since the abutment body in which the pocket 90 is formed has a substantially cylindrical shape and is fixed so as to extend in the same direction as the axial direction of the implant 8, the same is applied when the implant 8 is inclined. It will be attached in an inclined state. Therefore, when the adjacent implants 8 and 8 are embedded so as to face each other as shown in FIG. 4, a hook portion on which the denture resin is hooked by the abutment 9 is formed between the implants 8 and 8. In some cases, it was difficult to remove.

In addition, when the implants 8 and 8 are tilted as shown in FIG. 4, the denture magnet and the magnetic body 91 may not be in close contact with each other, and a gap is formed between them. There was also a problem that the denture was not easily obtained and was easily removed.
Furthermore, in the case where the denture magnet and the magnetic body 91 are not in close contact with each other, there is also a problem that dirt and dust accumulate in the gap.

  An object of the present invention is to provide an abutment in which a prosthesis such as a denture can be detachably attached to an implant embedded in a jawbone, and an upper side that is a portion protruding from the gum of the abutment body is directed upward. An object of the present invention is to provide an abutment and a method of manufacturing the abutment that are formed so as to have a constricted shape so that the prosthesis can be easily attached and detached, and can be attached in a state in which the prosthesis is closely attached.

Means taken by the present invention to achieve the above object are as follows.
In the first invention,
An abutment (1) that allows a denture (4) to be detachably attached with magnetic force to an implant (2) that is embedded in a state inclined to the jawbone,
An abutment body (10) attached to the implant (2) with a fixing bolt (3) passed through the fixing bolt insertion hole (104);
A magnetic body (11) provided at the end of the abutment body (10) on the denture (4) side;
With
The abutment body (10) is
Manufactured by scraping titanium or titanium alloy mass,
A fitting recess (102) in which the magnetic body (11) is embedded is formed on the attachment side with the denture (4),
The portion toward the denture (4) side from the connecting portion with the implant embedded in the gingiva (51) is widened, and the portion protruding from the gingiva (51) has a shape that narrows toward the denture (4) side,
There is a corner (100) at the boundary between the portion embedded in the gingiva (51) and the portion protruding from the gingiva (51), and the corner (100) is at the same height as the surface of the gingiva (51),
The magnetic body (11) is bonded after the abutment body (10) is attached to the implant (2),
Even when the implant (2) is obliquely embedded, the upper surface of the magnetic body (11) that magnetizes the denture (4) is configured to be horizontal or substantially horizontal,
It is an abutment.

In the second invention,
The abutment according to the first invention is manufactured using a computer-controlled design / production system,
It is a manufacturing method of an abutment.

In the third invention,
The abutment according to the first invention is manufactured using a CAD / CAM system,
It is a manufacturing method of an abutment.

(Work)
An abutment manufacturing method according to the present invention will be described.
First, in manufacturing an abutment, an impression mold in the patient's oral cavity is collected. Impression-type sampling is performed on patients who have already been implanted with implants. Impression molds are collected by forming with plaster or shooting with a special camera. Data is input to the computer when shooting with the camera.

  Next, from the collected impression mold, the upper side, which is a portion protruding from the gingiva, has a shape that is constricted upward, or the upper side, which is a portion that protrudes from the gingiva, is constricted upward. The abutment shape is created so that the upper surface of the magnet or magnetic body is horizontal or substantially horizontal even when the implant is embedded obliquely. The abutment shape can be created by measuring a shape of an impression type and inputting data, and a model can be created on a computer, or by creating a wax type for the impression type. When the abutment shape is made of a wax shape, the shape of the wax shape is measured. In the row type measurement, data is input to a computer by using a laser or the like.

  Then, the abutment main body is manufactured by cutting out from the metal lump so as to form a product having the same shape as the finished abutment shape.

(A) According to the present invention, the abutment body portion protruding from the gum has a narrowed shape toward the denture side, the upper surface of the magnetic material even if the implant is embedded in an oblique horizontal or It is comprised so that it may become substantially horizontal. Therefore, for example, even when adjacent implants are embedded so as to face each other, a portion in which a denture is caught between the conventional implants is not formed. Thereby, in an abutment, attachment and removal of a denture are easy.

(B) According to the present invention, since the abutment body can be formed in the shape described above, the denture can be brought into close contact with the magnetic body even when the implant is inclined. Therefore, the denture can obtain a presumed magnetizing force and is difficult to come off.
Furthermore, it is possible to adhere the dentures to the magnetic, dirt and debris also hardly accumulate between the denture and the abutment.

Embodiments of the present invention will be described in more detail with reference to the drawings.
FIG. 1 shows an embodiment of a magnetic abutment according to the present invention, and is an exploded perspective view showing a state of being attached to an implant.
FIG. 2 is an explanatory diagram of a use state showing a state in which the magnetic abutment shown in FIG. 1 is attached to an implant embedded in the lower jaw.
FIG. 3 is an exploded explanatory view showing a state in which the denture is attached to the magnetic abutment shown in FIG. 2 by a magnet.

  Reference numeral 1 denotes a magnetic abutment that is an abutment. The magnetic abutment 1 includes an abutment main body 10 and a magnetic body (keeper) 11 having a circular shape in plan view. The magnetic body 11 is made of a magnetic metal. The magnetic body 11 has a property that a magnet is magnetized. The magnetic abutment 1 is attached to the implant 2 with fixing bolts 3.

  The abutment body 10 has a substantially frustoconical shape whose upper side is narrowed upward, and has a substantially frustoconical shape whose lower side is narrowed downward. The corner portion 100 is formed so as to appear. When the abutment body 10 is attached to the implant 2, the upper side that is narrowed upward is protruded from the gum 51, and the lower side that is narrowed downward is embedded in the gum 51. It is formed to have a shape suitable for each patient. Therefore, if the same patient has a plurality of implants, the shape of the abutment body 10 is different.

  A flat plane 101 having a required diameter is formed on the abutment body 10. Further, the flat surface 101 is formed with a fitting recess 102 for embedding the magnetic body 11. The fitting recess 102 has a circular shape in plan view, and is formed in such a size that no gap is formed when the magnetic body 11 is embedded. The magnetic body 11 has a required thickness (height), and the upper and lower surfaces are formed in a planar shape.

  A fixing bolt engaging hole 103 is formed inside the abutment main body 10 corresponding to the bottom of the fitting recess 102. The fixing bolt engaging hole 103 is formed such that the central axis direction is directed toward the inclined axis direction of the implant 2 so that the upper surface of the magnetic body 11 is attached to the implant 2 in a substantially horizontal state. The fixing bolt engaging hole 103 is formed to have a size slightly larger than the head 30 of the fixing bolt 3.

  A fixed bolt insertion hole 104 through which the threaded portion 31 of the fixing bolt 3 is inserted is formed inside the abutment body 10 corresponding to the bottom of the fixing bolt engaging hole 103. The fixing bolt insertion hole 104 is also formed so that the central axis direction is directed toward the inclined axis direction of the implant 2 so that the upper surface of the magnetic body 11 is attached to the implant 2 in a substantially horizontal state. The fixing bolt insertion hole 104 is formed to have a slightly larger diameter than the threaded portion 31 of the fixing bolt 3.

  At the lower part of the abutment main body 10 in contact with the implant 2, an abutment main body 10 is provided so as not to rotate with respect to the implant 2 by fitting with an engaging convex portion (described later) protruding from the upper surface of the implant 2. An engaging recess 105 is formed so as to enable this. The engaging recess 105 is formed to have a hexagonal shape. The lower part of the fixing bolt insertion hole 104 communicates with the engagement recess 105.

  The abutment main body 10 is formed by cutting a lump of pure titanium. The abutment main body 10 can also use a titanium alloy. A method for manufacturing the abutment body 10 will be described in detail later.

Next, the implant 2 will be briefly described.
The implant 2 is made of pure titanium and has a substantially cylindrical shape with a short length. The gingiva 51 is cut open to form a buried hole 500 in a bone 50 such as a jawbone, and is buried in the buried hole 500 and firmly adhered to the bone 50. It is attached by letting. As can be seen from the drawing, the implant 2 is attached in an inclined state depending on the attachment position and the state of the bone 50. In addition, the implant 2 can also use the thing made from a titanium alloy.

  On the upper surface of the implant 2, an engaging convex portion 20 that can be fitted to the engaging concave portion 105 of the abutment main body 10 without a gap is projected. Further, a fixing bolt screwing hole 21 into which the screw part 31 of the fixing bolt 3 can be screwed is formed to have a required depth from the upper surface of the engaging convex part 20 to the inside of the implant 2.

  The magnetic abutment 1 is formed by fitting the engaging concave portion 105 of the abutment body 10 and the engaging convex portion 20 of the implant 2 so that the fixing bolt engaging hole 103 and the fixing bolt inserted in the bottom portion of the engaging concave portion 102 are inserted. The fixing bolt 3 is passed through the hole 104, and the screw portion 31 is screwed into the fixing bolt screwing hole 21 until the head 30 of the fixing bolt 3 hits the bottom of the fixing bolt engaging hole 103 and stops. After the abutment body 10 is attached to the implant 2, the magnetic body 11 is bonded by putting the adhesive 12 in the fitting recess 102. When the magnetic body 11 is attached to the fitting recess 102, the top surface is substantially horizontal.

The denture 4 magnetically attached to the magnetic abutment 1 will be briefly described.
The dental prosthesis 4 that is a prosthesis is formed by combining a tooth portion (reference numeral omitted) that forms a ceramic tooth and a gingival portion 40 that forms a resin gingiva. A fitting recess 41 into which the abutment main body 10 is fitted without a gap is formed at a location corresponding to the magnetic abutment 1 of the gingival part 40 corresponding to the back side of the denture 4. A magnet 42 magnetically attached to the magnetic body 11 is embedded in the inner part of the fitting recess 41 so that only the surface appears.

  In the present embodiment, the magnetic body made of magnetic metal is provided on the abutment body 10 side and the magnet 42 is provided on the denture 4 side, but this may be reversed.

  In the present embodiment, the abutment body 10 is formed so as to have a substantially frustoconical shape in which the upper side is narrowed upward, and the lower side is shaped to have a substantially frustoconical shape that is narrowed downward. This shape is not particularly limited, as long as at least the upper side that protrudes from the gingiva 51 is substantially parallel to the attaching / detaching direction of the denture 4 or is slanted inwardly upward. good.

(Work)
With reference to FIG. 1 thru | or FIG. 3, the manufacturing method of the magnetic abutment 1 shown by this Embodiment and its effect | action are demonstrated.
The abutment body 10 constituting the magnetic abutment 1 is manufactured by the following procedure using a computer-controlled design / production system. In the present embodiment, the computer-controlled design / production system specifically uses a CAD / CAM system (Computer Aided Design / Computer Aided Manufacturing Milling).

  First, the impression type in the patient's mouth is collected. In the impression mold, a curable resin is provided in the oral cavity in the same manner as a normal mold, and a resin mold is formed. A plaster mold is formed from the resin mold. Impression-type sampling is performed on a patient in which the implant 2 has already been embedded.

  Next, an abutment shape suitable for each patient is designed and created from the collected impression type. The abutment shape is created by raising the wax (wax-up) with respect to the impression mold and forming the wax mold. The abutment shape is such that when the abutment body 10 is attached to the implant 2, the upper side which is narrowed upward is protruded from the gum 51 and the lower side which is narrowed downward is embedded in the gum 51. It is formed for each patient so as to be in a state.

  The wax-shaped shape created in the above process is measured. The wax shape is measured in a non-contact state using a laser, and the obtained data is input to a CAD / CAM system.

  When the abutment shape data is input to the CAD / CAM system, the abutment shape is displayed on the computer display. If there is a defect in the abutment shape, it can be corrected on the display as appropriate.

  When the abutment shape is finally determined, the CAD / CAM system cuts out the titanium agglomerate having the same shape as the abutment shape. Thus, the abutment main body 10 is manufactured.

  Thus, the abutment body 10 having a shape suitable for each patient can be manufactured by using the CAD / CAM system. According to this abutment main body 10, even when the implant 2 is inclined and embedded, the upper surface of the magnetic body 11 can be in a substantially horizontal state. In addition, when the abutment body 10 is attached to the implant 2, the upper side protrudes from the gingiva 51 that is narrowed upward, and the lower side is embedded in the gingiva 51 that is narrowed downward. 2, even when the adjacent implants 2 and 2 are embedded so as to face each other as shown in FIG. 2, a portion where the denture gingival part 40 is caught is not formed as in the conventional case. . Therefore, in the magnetic abutment 1, the denture 4 can be easily attached and detached.

Moreover, in the magnetic abutment 1, since the abutment main body 10 can be formed in the shape described above, the magnet 42 of the denture 4 and the magnetic body 11 can be brought into close contact with each other even when the implants 2 and 2 are inclined. Accordingly, the denture 4 can obtain a presumed magnetic adhesion and is difficult to come off.
Further, since the magnet 42 of the denture 4 and the magnetic body 11 can be brought into close contact with each other, dirt and dust are hardly accumulated between the denture 4 and the magnetic abutment 1.

  In the magnetic abutment 1, since the abutment body 10 is manufactured by using a CAD / CAM system, the abutment body 10 can be manufactured in a short time and easily.

  In the present embodiment, a method of collecting an impression mold with a conventional plaster mold is used, but this is not particularly limited. For example, the inside of a patient's oral cavity is photographed from various angles with a special camera. However, it is also possible to use a system that represents an impression type on a computer display so that intraoral data is directly input to the CAD / CAM system.

  In the present embodiment, an abutment shape suitable for each patient is created by forming a wax shape by raising a wax with respect to the impression type, but this is not limited. For example, if data has already been input by the camera described above, it can be created directly on a computer, or even when a plaster mold is formed, the shape of the plaster mold is measured using a laser, and the data is converted into CAD data. It can also be input on a CAM system and created on a computer.

  The terms and expressions used in this specification are merely explanatory and are not limiting at all, and exclude terms and expressions equivalent to the features described in this specification and parts thereof. There is no intention to do. It goes without saying that various modifications are possible within the scope of the technical idea of the present invention.

Explanatory perspective explanatory drawing which shows one Embodiment of the magnetic abutment which concerns on this invention, and shows the state attached to an implant. Explanatory drawing of a use state which shows the state which attached the magnetic abutment shown in FIG. The exploded explanatory view showing the state where a denture is attached to the magnetic abutment shown in FIG. 2 with a magnet. The use condition explanatory drawing which shows the state which attached the conventional abutment to the implant embed | buried under the lower jaw.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Magnetic abutment 10 Abutment main body 100 Corner | angular part 101 Plane 102 Fitting recessed part 103 Fixing bolt engaging hole 104 Fixing bolt insertion hole 105 Engaging recessed part 11 Magnetic body 12 Adhesive 2 Implant 20 Engaging convex part 21 Fixing bolt screwing Hole 3 Fixing bolt 30 Head 31 Screw part 4 Denture 40 Gingiva part 41 Fitting recess 42 Magnet 50 Bone 500 Buried hole 51 Gingival 8 Implant 9 Abutment 90 Pocket 91 Magnetic body

Claims (3)

An abutment (1) that allows a denture (4) to be detachably attached with magnetic force to an implant (2) that is embedded in a state inclined to the jawbone ,
An abutment body (10) attached to the implant (2) with a fixing bolt (3) through the fixing bolt insertion hole (104);
A magnetic body (11) provided at the end of the abutment body (10) on the denture (4) side;
With
The abutment body (10)
Manufactured by scraping titanium or titanium alloy mass,
A fitting recess (102) in which the magnetic body (11) is embedded is formed on the attachment side with the denture (4),
The portion toward the denture (4) side from the connecting portion with the implant embedded in the gingiva (51) is widened, and the portion protruding from the gingiva (51) has a shape that narrows toward the denture (4) side,
There is a corner (100) at the boundary between the portion embedded in the gingiva (51) and the portion protruding from the gingiva (51), and the corner (100) is at the same height as the surface of the gingiva (51),
The magnetic body (11) is bonded after the abutment body (10) is attached to the implant (2),
Even when the implant (2) is obliquely embedded, the upper surface of the magnetic body (11) that magnetizes the denture (4) is configured to be horizontal or substantially horizontal,
Abutment. The abutment according to claim 1 is manufactured using a computer-controlled design and production system,
A manufacturing method of the abutment. The abutment according to claim 1 is manufactured using a CAD / CAM system,
A manufacturing method of the abutment.

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