JP2896997B2 - Method for producing dental implant and cast model pattern used for the production - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a dental implant and a cast model pattern used in the production.

[0002]

2. Description of the Related Art Dental implants are classified into one-time (one-piece) implants, one-time two-piece implants, and two-time (2 times) implants according to the number of operations and the number of members used.
Peace) There are three types of implants.

[0003] Among them, one-time two-piece implant and two-piece implant
The round (two-piece) implant uses two pieces, a fixture to be implanted in the jaw bone and an abutment to which the prosthesis is to be attached, and the abutment is screwed to the fixture. ing.

That is, in the single-piece two-piece implant shown in FIG. 1, the fixture (1) is implanted in the jawbone (2) by one operation, and the upper surface of the fixture is placed on the gingiva (3). The abutment (4) is fixed to the fixture with screws (5) provided on the fixture. In this case, the prosthesis (6) is fixed to the abutment with the screw (7), and the margin (8) (the lower end of the prosthesis) of the prosthesis is joined to the joint (abutment) between the fixture and the abutment. It is in position 9).

[0005] In addition, in the two-piece (two-piece) implant shown in FIG. 2, the fixture (1) is embedded in the jawbone (2) in the first operation and the gingiva (3) is sutured. For about 3 months (while the adhesion between the bone and the fixture is completed). Then, a second operation is performed to cut the gum, and an abutment (10) made of gold or the like for penetrating the gum is screwed to the fixture (1). Next, the abutment (4) for joining the prosthesis is fixed to the fixture (1) with the screw (12) via the abutment (10) for penetrating the gingiva. At this time, the abutment (4)
The margin (8) of the prosthesis (6) mounted on the fixture (1) and the abutment (10) for penetrating the gingiva
(9).

As described above, the one-time two-piece implant and the two-time (two-piece) implant are fixed.
(1) and the abutment (4) are fixed with screws (5, 12), which have a fixture thickness of about 3.5-3.5.
Approximately 2mm because it is 4mm (Japanese can not make the fixture thick because the jawbone is smaller than Westerners)
Since the position of the margin (8) of the prosthesis (6) is the position of the joint (9) between the fixture (1) and the abutment (4), When the external force acting on the prosthesis concentrates on the joint, the thin screw cannot withstand the external force and breaks.

Further, when the prosthesis (6) is fixed to the abutment (4) with screws (7) as shown in FIG.
In some cases, it was difficult to tighten the screw and the screw became loose. Furthermore, in the two-time (two-piece) implant shown in FIG. 2, an additional abutment (10) is provided for penetrating the gingiva, so that the amount of parts increases, and the abutment for joining prostheses is further increased. Screw (12) for attaching the element (4)
Is screwed into the screw (11) provided in the fixture (1), so that the tightening strength of the screw is further reduced.

[0008]

SUMMARY OF THE INVENTION The present invention eliminates the screw engagement between the fixture and the abutment to eliminate the damage to the screw, and is durable, easy to use, and easy to manufacture, and can be made economically. How to make dental implants
It is an object of the present invention to provide a casting model pattern used in the method and its production.

[0009]

SUMMARY OF THE INVENTION The present invention provides a fixture
A hole having a non-circular portion is formed at the top of the
Cast a prosthesis with a non-circular shaft
A joint between a prosthesis and a fixture, wherein the prosthesis is
When casting a product, a casting model pattern is used.
Has a shaft-shaped body that can be incinerated by heating.
The lower part has a non-circular cross section corresponding to the hole of the fixture.
A recess for forming the shank and holding the impression material on top
Only after forming with the impression material
Wax up the tooth equivalents and add
Burn the turn in the mold and incinerate the tooth
It is made by casting a technical metal.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Fixture implanted in jaw bone
A hole (21) is formed in the upper part of (20). The hole (21) is
This is for joining the prosthesis (22) to the fixture (20). In the illustrated case, the upper part is formed in a conical shape, and the lower part is formed in a hexagonal shape. For example, a non-circular portion (23) such as a polygon such as a triangle or a quadrangle, or an ellipse may be partially or entirely formed. Although the outer peripheral surface of the fixture is formed in a screw shape (24) in the illustrated case, it may be formed in a smooth shaft shape.

Dental implants have fixtures of various diameters and lengths depending on bone mass and bone quality.
If (21) is set to the same size for all fixtures, it is standardized and convenient.

The joint between the fixture (20) and the prosthesis (22) is bonded by cement or other adhesive or bonding agent, and the exposed portion on the gingival margin is acid-treated to enhance the bonding. The surface may be roughened by sand blasting or sand blasting.

In an embodiment, a cast model pattern (26) is used to form the prosthesis. The pattern
Is provided with a shaft-shaped main body as shown in the figure, and the lower part of the main body is cut off so as to fit in the hole (21) of the fixture.
A non-circular shaft portion (27) is formed.

A recess (28) is provided on the upper surface of the pattern (26) so that it can hold the impression material when it is attached or waxed up, as described later. Can be In the case shown in the figure, it is a ring-shaped recess (groove).

The above-mentioned pattern (26) is preferably one which does not cause heat shrinkage at the time of molding, and which is easily burned off at the time of casting (described later) and is harmless, such as polymethyl methacrylate (PMMA). Plastic materials such as methacrylic resin, AS resin, polypropylene, polyethylene (LDPE), brazing material, and the like are used.

When installing the implant, the fixture (20) is implanted in the jawbone (2) such that the upper part thereof is exposed by about 2 to 3 mm from the gingiva (3).

After about 3 months from the implantation, when the osseous adhesion is completed, as shown in FIG. 4, the hole (21) of the fixture (20) is formed.
The above-mentioned pattern (26) is inserted into the device, and an impression is taken in that state.

After taking the impression, remove the impression material (29),
With the pattern (26) attached to the impression material, it is removed from the fixture (20) (FIG. 5).

Next, as shown in FIG. 6, under the impression material (29) and the pattern (26), the temporary seat (30) is hardened with gypsum, lime, chalk or the like.
To form

Here, the impression material (29) is removed, and FIG.
As shown in (1), the tooth equivalent portion (31) is waxed up with a brazing material or the like.

FIG. 8 shows a state in which the wax-up tooth-like portion (31) and the above-mentioned pattern are connected and removed from the temporary seat (30).
This is buried in the mold as a model of the mold (32) as shown in, and this is heated and waxed-up tooth equivalent part (31)
And the pattern (26) is incinerated. Dental metals such as a platinum alloy, a silver-palladium alloy, and a cobalt chromium alloy, which have been melted from a gate (33), are injected into the incinerated and hollowed portion and cast to form a metal body (metal frame).

After casting, the prosthesis (22) is formed by performing indexing, various types of polishing, baking porcelain or the like, and finishing with ceramic coating or the like (FIG. 9). The prosthesis (22) has a shaft portion (34) formed at a lower portion corresponding to the hole (21) of the fixture (20), and a side edge portion (35) closely contacting the periphery of the fixture. )have.

The shaft portion (34) of the prosthesis is inserted into the hole (21) of the fixture. At that time, an adhesive or bonding agent such as cement is attached to the bonding surface, and the prosthesis is bonded and bonded to the fixture to complete the implant (FIG. 10).

[0024]

According to the present invention, there is provided a fixture as described above.
The prosthesis formed to correspond to this is inserted into the hole having a non-circular portion through an adhesive or bonding agent such as cement to join the fixture and the prosthesis. Therefore, the prosthesis is easy to carry out, and the prosthesis is prevented from rotating with respect to the fixture, so that the prosthesis does not loosen or come off during use, and is firmly joined to withstand long-term use. Also, since there is no screw engagement part such as fixing the fixture and the abutment by screwing, there is no need to worry about breakage of the screw,
It is strong. Moreover, since the prosthesis is formed by casting using a cast model pattern, the prosthesis is easy to manufacture, and at least one kind of the above pattern is used for various sizes of fixtures. Things can be formed and made economically.

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing a conventional one-piece two-piece implant.

FIG. 2 is a partially cutaway sectional view showing a conventional two-time (two-piece) implant.

FIG. 3 is a perspective view showing a relationship between a fixture and a cast model pattern.

FIG. 4 is a partial cross-sectional view showing a state in which an impression material is obtained.

FIG. 5 is a cross-sectional view showing a combined state of the impression material and the cast model pattern.

FIG. 6 is a sectional view showing a state in which a temporary seat made of gypsum is formed under the impression material and the cast model pattern in a connected state.

FIG. 7 is a cross-sectional view showing a state where waxing is performed.

FIG. 8 is a sectional view showing a state of casting.

FIG. 9 is a sectional view of a prosthesis.

FIG. 10 is a partial cross-sectional view showing a state in which the prosthesis is joined to the fixture.

[Explanation of symbols]

20 Fixture 21 Hole 22 Prosthesis
23 Non-circular part 26 Casting model pattern 27 Shaft part 29 Impression material 30 Temporary seat 31 Teeth equivalent part 34 Shaft part

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-255137 (JP, A) JP-A-59-97658 (JP, A) JP-A-62-194852 (JP, A) 133605 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) A61C 8/00 A61C 13/20

Claims (2)

(57) [Claims] 1. A hole having a non-circular portion is formed at an upper part of a fixture to be implanted in a jawbone, and can be incinerated by heating.
A shaft-shaped main body made of a suitable material was provided, a shaft portion having a non-circular cross section corresponding to the above-mentioned hole was formed at a lower portion of the main body, and a recess was formed in an axial center direction at an upper portion to hold an impression material. Using a cast model pattern, the shaft of the pattern is inserted into the hole of the fixture, an impression material is attached to the upper part of the pattern, and the impression material and the pattern are removed from the fixture in a connected state. A temporary seat is formed under the material and the pattern, the impression material is removed, a tooth equivalent portion is waxed up at this position, and the waxed tooth equivalent portion and the above pattern are connected to each other and removed from the temporary seat and embedded in a mold. and, by heating the incinerated teeth corresponding parts and the pattern wax-up and cast by injecting a dental metal hollowing portion the incineration to, subjected to finishing in the cast metal body Parts and forming a prosthesis integral method for producing a dental implant the shank of the prosthesis is joined to the hole of the fixture. 2. It is formed of a material that can be incinerated by heating .
Comprising a shaft-like body, the recessed peripheral surface provided so as to retain the impression material at the top of the body, sectional noncircularity to correspond to the hole of non-circular portion formed on the upper portion of the fixture at the bottom of the body
Casting model pattern used for <br/> method of manufacturing a dental implant according to claim 1, wherein providing the shank of the form.