JPH07116174A - Parts combination and male screw for implant in bone - Google Patents

Abstract

PURPOSE:To obviate the need for removing an implant in a bone when an upper structure needs to be removed and to prevent body fluids from entering the upper structure during use in a living body for a prolonged period of time, by means of a male screw in which threads having different phases are provided at two or more positions of the body of the male screw. CONSTITUTION:A dental implant 1 comprises a raised portion for fitting on the top thereof and a tapped hole going through the raised portion and having an opening on the top of the raised portion. An abutment 2 applied on the top of the dental implant 1 has a hole on the lower side for fitting the abutment 2 on the raised portion of the implant 1 and a hole on the upper side for fixing a male screw to the abutment 2, which holes constitute a hole going through the entire length of the abutment 2. The male screw 3 comprises a screw head 3a engaged with the hole for fixing the male screw to the abutment 2, a screw body 3b (provided with two threads having different phases) fitting in the tapped hole, and recessed parts 3c of the screw body 3b which are capable of changing the shape thereof due to the elasticity thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combination of members for an intraosseous implant and a male screw usable for the combination.

[0002]

2. Description of the Related Art Recently, intraosseous implants have been remarkably advanced in the fields of dentistry and medicine, and various endosseous implants have been used. Conventionally, fastening between these intraosseous implants and an upper structure or upper structures including a crown portion has been performed by joining with a fastening member such as a screw, a resin, or a cement. Further, as a loosening prevention, a screw is fixed with resin or cement, or a metal or resin washer, a spring, an O-ring or the like is used together with the screw.

[0003]

A conventional method for fastening an intraosseous implant and an upper structure by joining them with a fastening member such as resin or cement is to damage the upper structure fastened due to some factor, Alternatively, when the environment in the oral cavity changes and it is necessary to remove the upper structure, there is a problem that only the upper structure cannot be removed and the implant must be removed.

[0004] Further, the one fastened with a screw in consideration of removal of the upper structure has a problem that it may come loose and fall off or be damaged by long-term in-vivo use. There is a gap in the mating part between the upper structure and the upper body, and the body fluid enters the upper structure. (When the body fluid enters, it becomes a source of infection and the implant may fall off. ) Had.

When a metal washer or spring is used together with a screw, the washer or spring is made of a material having excellent biocompatibility, and even if it comes into contact with another member (upper structure, etc.) I had to choose something that wouldn't be. Therefore, there is a problem that the usable materials are limited, and further, such a material also has a problem in terms of material (a sufficient performance as a washer or a spring cannot be exhibited, and it is expensive). In the case of resin washers and springs, there is a problem that they have to be replaced in a short period of time because they have low durability.

The object of the present invention is to solve these problems.

[0007]

Therefore, the present invention is firstly directed to "an intraosseous implant having a fitting protrusion at the upper end and a screw hole penetrating the protrusion and opening to the upper surface, and an upper portion of the implant. An upper structure to be attached, which has a lower fitting hole that fits into the fitting protrusion of the intraosseous implant and an upper threaded through hole consisting of an upper male screw fixing hole, In a member combination for an intraosseous implant, comprising a screw head locked to the male screw fixing hole and a male screw having a screw leg screwed into the screw hole,
A member combination (claim 1), characterized in that screw parts having phases different from each other are provided at two or more positions of the screw legs of the male screw.

A second aspect of the present invention is an "intraosseous implant having a large-diameter fitting hole opened on the upper surface and a small-diameter screw hole opened in the fitting hole, and attached to the upper part of the implant. An upper structure having a fool hole penetrating up and down, having a fitting protrusion that fits into a fitting hole of the intraosseous implant on the lower side and a male screw fixing hole on the upper side, and the fool hole is A combination of members for an intraosseous implant, which includes an upper structure penetrating the protrusion, a male head having a screw head locked in the male screw fixing hole, and a male screw having a screw leg screwed into the screw hole. In, 2 of the screw legs of the male screw
There is provided a member combination (claim 2), characterized in that screw parts having phases different from each other are provided at more than one place.

Further, the present invention thirdly provides "a member combination (claim 3) according to claim 1 or 2, characterized in that a rotation stopping structure is provided in the fitting protrusion and the fitting hole." To do. In the fourth aspect of the present invention, "in the male screw,
An elastically deformable portion is provided between a screw part and a screw part having different phases and between the screw head and the screw foot (Claim 4). I will provide a.

Fifthly, the present invention relates to an "intraosseous implant having a large-diameter upper structure fixing hole opened on the upper surface and a small-diameter screw hole opened in the fixing hole, and locked in the fixing hole. In a member combination for an intraosseous implant consisting of a head and a superstructure having a male screw that engages with the screw hole, screw parts having different phases are provided at two or more positions of the male screw. And a member combination (claim 5) ".

A sixth aspect of the present invention is that "in the upper structure, elastically deformable portions are provided between the screw portions having different phases and between the screw portions and between the head portion and the male screw. The member combination according to claim 5 (claim 6) is provided. Further, a seventh aspect of the present invention is that, in a “male screw including at least a screw head and a screw leg, screw parts having different phases are provided at two or more positions of the screw leg (claim 7). )"I will provide a.

In the eighth aspect of the present invention, "the male screw according to claim 7 is characterized in that an elastically deformable portion is provided between the screw portions having different phases. )"I will provide a.

[0013]

In the upper structure according to the present invention, a gingival penetrating member (hereinafter referred to as an abutment) that penetrates the gingival portion and is fastened to the intraosseous implant, and a support that is coupled to the gingival penetrating member and the crown portion. A gingival penetrating support abutment (hereinafter, abutment core) in which an abutment (hereinafter, referred to as a core) is integrated, and a support that is fastened to a gingival penetrating intraosseous implant and is coupled to a crown portion Abutment included.

The fastening of the intraosseous implant 1 and the upper structure 2 according to the present invention is performed as follows, for example. The fitting hole 2b of the upper structure (for example, abutment) 2 is inserted into the fitting protrusion 1b of the intraosseous implant (for example, dental implant) 1, and the male screw 3 is inserted from the fool hole 2a of the upper structure 2. Insert and tighten with arbitrary tightening torque. Screw leg (having a plurality of screw parts with different phases) 3b
And the screw hole 1a of the intraosseous implant 1 is screwed (the male screw 3 and the intraosseous implant 1 are fastened).

At this time, the screw head (bearing surface) 3a of the male screw 3
Is locked in the male screw fixing hole 2c of the upper structure. In addition, since the screw leg 3b screwed into the screw hole 1a of the intraosseous implant 1 has a plurality of screw portions having different phases,
A strong frictional force is generated between the screw hole 1a and after screwing. Therefore, the male screw 3 is strongly fixed between the intraosseous implant 1 and the upper structure 2, and moreover, it is possible to prevent loosening due to vibration or the like and prevent invasion of body fluid due to loosening.

Another example of fastening the intraosseous implant and the superstructure is shown below. The upper structure fixing hole having a large diameter opened on the upper surface and the screw hole having a small diameter opening to the fixing hole are fixed to the fixing hole from the fixing hole of the intraosseous implant (eg, dental implant) An upper structure (for example, an abutment) having a head and a male screw (having a plurality of screw portions having mutually different phases) screwed into the screw hole is inserted and tightened with an arbitrary tightening torque to The external thread of the structure is screwed into the screw hole of the endosseous implant (the superstructure and the endosseous implant are fastened).

At this time, the head of the upper structure is locked in the upper structure fixing hole of the intraosseous implant. In addition, since the screw leg that is screwed into the screw hole of the intraosseous implant has a plurality of screw portions that are out of phase with each other, a strong frictional force (entire or partial) with the screw hole during and after screwing. Occurs). Therefore, the upper structure is strongly fixed to the intraosseous implant, and further, loosening due to vibration or the like can be prevented, and invasion of body fluid due to loosening can be prevented.

In this way, the intraosseous implant and the upper structure are fastened. Incidentally, by providing the fitting protrusion and the fitting hole with rotation preventing shapes respectively, when the fitting protrusion is inserted into the fitting hole, the intraosseous implant and the upper structure are temporarily fixed and the male screw is inserted. It is preferable since the tightening operation can be surely and easily performed and the fastening between the intraosseous implant and the upper structure can be further strengthened (claim 3).

In the male screw, between the screw parts having different phases and between the screw parts, between the screw head and the screw legs, and between the screw parts having different phases and the screw parts in the upper structure. It is preferable to provide an elastically deformable portion (for example, a constricted body portion (escape groove) 3c in FIG. 4) between the head portion and the male screw (claims 4 and 6). In particular, in the case of the male screw having the large phase difference, it is preferable to provide the elastically deformable portion. Even if the phase difference is too large (the friction resistance between the screw part and the screw hole is too large) to screw the male screw into the screw hole of the implant, if the elastically deformable part is provided, that part will be deformed. Since the frictional resistance can be reduced, screwing becomes possible.

Further, even if the phase difference is small, if the elastically deformable portion is provided, the loosening of the screw due to vibration or the like can be prevented, and the invasion of body fluid due to the loosening can be prevented. be able to. If the superstructure needs to be removed, only the superstructure can be removed by loosening and releasing the male screw using a jig. Therefore, it is not necessary to remove the intraosseous implant.

If a female screw (screw hole) opened on the upper surface is provided on the head of the male screw head or the upper structure having the male screw according to the present invention, another upper structure (for example, a crown portion) is formed. ) Can be concluded, which is preferable. Further, also in the fastening of a male screw having a female screw (screw hole) opened on the upper surface or the head of the upper structure with another upper structure, it is preferable to provide the structure according to the present invention at the fastening portion.

The male screw according to the present invention can be used for general fastening other than fastening of the intraosseous implant and the superstructure. Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited thereto.

[0023]

EXAMPLE An example will be described with reference to FIGS.
Figure 1 shows a dental implant (an example of an intraosseous implant)
FIG. 2 is a combination diagram of the abutment 1 (an example of an upper structure) 2 and the male screw 3. The dental implant 1 is embedded in the jawbone. FIG. 2 is a schematic sectional view of the dental implant 1 of FIG. The dental implant 1 has a fitting projection 1b at the upper end and a screw hole 1a penetrating the projection 1b and opening on the upper surface.

FIG. 3 is a schematic sectional view of the abutment 2 of FIG. Abutment 2 is a dental implant 1
Fitting protrusion 1 of the implant 1 attached to the upper part of the
lower fitting hole 2b and upper male screw fixing hole 2 that fit in b
It has a stupid hole 2a made of c and penetrating vertically. FIG. 4 is a schematic side view of the male screw 3 of FIG. The male screw 3 includes a screw head 3a locked in the male screw fixing hole 2c, a screw leg (having two screw portions having different phases) 3b screwed into the screw hole 1a, and an elastically deformable constriction. Has a torso portion 3c.

Next, a method of fastening the abutment 2 to the dental implant 1 based on the above configuration will be described. First, the fitting hole 2b of the abutment 2 was inserted into the fitting protrusion 1b of the dental implant 1 at an arbitrary relative angle with the center line as an axis. Fitting hole 2 of abutment 2
b has a dodecagonal shape for rotation prevention, and the fitting protrusion 1b of the dental implant 1 has a hexagonal convex shape for rotation prevention, so that the centerline is an angle of 30 degrees. The fitting hole 2b of the abutment 2 was able to be inserted into the fitting projection 1b of the dental implant 1 at an arbitrary relative angle in increments. Moreover, since the dental implant 1 and the abutment 2 could be temporarily fixed, the operation (described later) of inserting and tightening the male screw 3 was reliable and easy.

Next, the male screw 3 is inserted from the burred hole 2a of the abutment 2 and tightened with an arbitrary tightening torque to screw the screw leg 3b and the screw hole 1a of the dental implant 1 into a male screw. 3 and the implant 1 were fastened. At this time, the screw head (bearing surface) 3a of the male screw 3 was locked in the male screw fixing hole 2c of the upper structure. Further, since the screw leg 3b screwed into the screw hole 1a of the intraosseous implant 1 has two screw portions having different phases from each other, a strong frictional force is generated between the screw leg 1a and the screw hole 1a during screwing and after screwing. . for that reason,
The male screw 3 was strongly fixed between the intraosseous implant 1 and the upper structure 2, and it was possible to prevent loosening due to vibration or the like, and to prevent invasion of body fluid due to loosening.

Since a constricted body portion 3c is provided as an elastically deformable portion between the screw head 3a of the male screw and the screw foot 3c and between the two screw parts having different phases, the screw foot is formed. When the 3b and the screw hole 1a of the dental implant 1 were screwed, the body portion 3c was elastically deformed. Therefore, as compared with the case where the torso portion 3c is not provided, it is possible to further increase the effect of preventing loosening of the male screw 3 and preventing invasion of body fluid due to loosening.

In this way, the dental implant 1 and the abutment 2 were fastened. The present invention is not limited to this embodiment, and can be used for fastening the intraosseous implant to the upper structure or the upper structures.

[0029]

As described above, according to the present invention, since it is possible to remove only the upper structure when it is necessary to remove the upper structure, it is not necessary to remove the intraosseous implant. In addition, the function in the living body for a long period of time does not loosen the fastening between the intraosseous implant and the upper structure. The problem of penetrating into the upper structure does not occur.

Further, by providing the rotation preventing shape at the fitting portion between the intraosseous implant and the upper structure, the operation of inserting and tightening the male screw can be surely and easily performed. Also, between the screw head and the foot of the male screw and between the two screw parts with different phases, or between the head of the upper structure and the male screw and between the two screw parts with different phases, the elastic By providing a deformable portion, the effect of preventing loosening of the fastening between the intraosseous implant and the upper structure, the effect of preventing body fluid from entering the upper structure, and the effect of improving the fastening operability when the phase difference is large Will increase.

[Brief description of drawings]

FIG. 1 is a combination view of a dental implant (an example of an intraosseous implant) 1, an abutment (an example of an upper structure) 2 and a male screw 3.

FIG. 2 is a schematic cross-sectional view of the dental implant (an example of intraosseous implant) 1 of FIG.

FIG. 3 is a schematic sectional view of the abutment (an example of an upper structure) 2 of FIG.

FIG. 4 is a schematic side view of the male screw 3 of FIG. 1.

[Explanation of Codes] 1 ... Dental implant (an example of intraosseous implant) 1a ... Screw hole 1b ... Fitting protrusion 2 ... Abutment (an example of upper structure) 2a. ..Mating hole 2c..Male screw fixing hole 3 .... Male screw 3a..Screw head 3b..Screw foot 3c..Constricted body part (one example of elastically deformable part)

Claims (8)

[Claims] 1. An intraosseous implant having a fitting protrusion at an upper end and a screw hole opened at an upper surface through the protrusion, and an upper structure attached to an upper portion of the implant, the intraosseous implant comprising: An upper structure having a vertically fitting through hole consisting of a lower fitting hole to be fitted to the fitting projection part and an upper male screw fixing hole, and a screw head locked to the male screw fixing hole. In a member combination for an intraosseous implant consisting of a male screw having a screw leg screwed into the screw hole, screw parts having different phases are provided at two or more positions of the screw leg of the male screw. And the combination of members. 2. An intraosseous implant having a large-diameter fitting hole opened on the upper surface and a small-diameter screw hole opened in the fitting hole, and a stupid hole attached to the upper part of the implant and penetrating vertically. An upper structure having, with a fitting protrusion that fits into a fitting hole of the intraosseous implant on a lower side,
An upper structure having a male screw fixing hole on the upper side, and the stupid hole penetrating the protrusion, a screw head locked in the male screw fixing hole, and a screw leg screwed with the screw hole. A member combination for an intraosseous implant, which comprises a male screw having the same, wherein a threaded portion having a phase different from each other is provided at two or more positions of the screw foot of the male screw. 3. The member combination according to claim 1, wherein a rotation stopping structure is provided on the fitting protrusion and the fitting hole. 4. An elastically deformable portion of the male screw is provided between a screw portion and a screw portion having different phases and between the screw head and the screw foot.
The member combination described in 3. 5. An intraosseous implant having a large-diameter upper structure fixing hole opened on the upper surface, a small-diameter screw hole opened in the fixing hole, a head engaged with the fixing hole, and the screw hole. In a member combination for an intraosseous implant, which comprises an upper structure having a male screw that is screwed with, a member combination characterized in that screw parts having different phases are provided at two or more locations of the male screw. 6. In the upper structure, between a screw portion and a screw portion having different phases and between the head portion and the male screw,
6. An elastically deformable portion is provided, and the portion is elastic.
The member combination described. 7. A male screw having at least a screw head and a screw leg, wherein a screw portion having a phase different from each other is provided at two or more locations of the screw leg. 8. The male screw according to claim 7, wherein an elastically deformable portion is provided between the screw portions having different phases from each other.