JPH07328041A - Therapeutic upper structure - Google Patents

Abstract

PURPOSE:To provide a therapeutic upper structure having good operability, not allowing gums to be reproduced on it during a curing period, and capable of being manufactured at a low cost by setting the diameter of the upper face of an intraosseous implant and the diameter of the lower face of a cylinder nearly equal, and bringing both faces into contact with each other wholly or partially. CONSTITUTION:For the method to fasten a therapeutic upper structure to an implant 1, a fixing screw 3 is screwed and connected to a tube body 2, and the male screw section of the fixing screw 3 is inserted into the female screw section of the tube body 2. The end rod tip of the fixing screw 3 is inserted and rotated into the post hole of the implant 1, a screw driver is inserted into a driver insertion hole at the head section of the fixing screw 3 to fasten the therapeutic upper structure to the post hole of the implant 1. The outer face of the tube body 2 to be brought into contact with gums is polished to increase the affinity with gums, the diameter of the upper face of the implant 1 is made nearly equal to the diameter of the lower face of the tube body 2, and both faces are brought into contact with each other wholly or partially so that a gap rarely exists between both faces.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION This invention relates to a secondary surgery for a double-dose intraosseous implant, which is performed until the gingiva is healed and recovered.
The present invention relates to a healing superstructure used for a bone and gingival implant that is temporarily attached to a gingival penetration part.

[0002]

2. Description of the Related Art Currently, there are two types of intraosseous implants (hereinafter referred to as "implants") in the dental field, which are a cylinder type and a blade type. Of these, three types of cylinder type implants having a cylindrical appearance are roughly classified into a columnar type, a conical type, and a screw (including a taper screw).
Further, the blade type has a plate-like appearance.

There are two methods for implanting such an intraosseous implant, a "double implant method" and a "single implant method". In the former method, the implant is completely embedded in the bone at the time of implanting, which is a primary operation, and takes several months. Later, the gingiva is incised by a secondary operation, and an upper structure such as a crown is attached to the implant. On the other hand, in the latter case, the implant penetrates the gingiva at the time of implantation and is exposed in the oral cavity. Therefore, it is not necessary to incise the gingiva when the upper structure is attached.

In addition, in the secondary surgery of the double implant method, after the gingiva is incised, the healing and recovery are generally waited for 1 to 6 weeks, and then a predetermined upper structure which is a crown portion is attached. During this recovery period, an upper structure for healing is temporarily attached to the incised gingival part. Without this, the gingiva would cover the implant again. healing,
After recovery, the healing superstructure is removed and a predetermined superstructure, which is the crown portion, is attached.

In this case, if the external shape of the healing upper structure is set to be similar to the gingival penetrating portion of a predetermined upper structure such as a crown to be mounted next, the upper structure which is the crown is It is easy to attach, and the adhesion and affinity between the upper structure, which is the crown portion after attachment, and the gingiva are improved. Further, if there is a gap between the implant upper surface and the healing upper structure lower surface which are in contact with each other after the healing upper structure is inserted, the gingival tissue grows there,
The upper structure, which is the crown, cannot be attached. Therefore, conventionally, several types of healing superstructures have been prepared in accordance with the thickness of the patient's gingiva, with an appropriate height that is slightly exposed from the upper edge of the gingiva to the oral cavity. In addition, pure titanium is often used as the material, and the surface that comes into contact with the gingiva is generally mirror-polished.

[0006] To connect the healing superstructure to the implant, a method of attaching the post portion of the healing superstructure to the post hole of the implant with temporary cement or a female screw formed in the post hole is used. There is a screwing method, and the latter is currently the mainstream. Further, in the commercially available healing upper structure, the post portion and the gingival piercing portion are constituted by one component. Especially for those that are screwed together, the gingival penetration part of the healing superstructure becomes the head of the screw and slides on the top surface,
Crosses, hexagonal holes, square holes, etc. are also provided.

[0007]

However, in the case of the conventional healing superstructures that have been used so far,
A tubular part that comes into contact with the gingiva and a male screw that is screwed into the female screw of the post hole are provided at the tip of the tubular part. Since the screw part and the gingival penetration part are integrated, after screwing the screw In order to eliminate the gap between the upper surface of the implant and the lower surface of the healing superstructure and to ensure a correct fit, for example, the cross-sectional shape perpendicular to the implant long axis has a circle, an ellipse, or It has been necessary to manufacture by machining a shape such as a prismatic shape, which is sometimes tapered, to be fitted into a recess or protrusion. Therefore, since the shape of the healing superstructure is very complicated, such machining is difficult and the manufacturing cost is inevitably high. Further, when the implant upper surface has a protrusion, the thread portion of the healing superstructure is considerably farther than the end portion of the screw round bar portion than the connection portion between the implant upper surface and the healing upper structure lower surface in processing. In order to fasten the healing superstructure to the implant, it is necessary to rotate the healing superstructure itself many times in a narrow oral cavity, which is disadvantageous in that operability is very poor. It was

In order to solve such a drawback, it is possible to attach a cylindrical body having a through hole and a fixing screw for fixing the cylindrical body to the implant, but in order to handle a small part in a narrow oral cavity. However, if the two parts are separated from each other, the operability is very poor, the operation time becomes long, and there is a high possibility that the result of the operation is not good due to infection or the like. Furthermore, it is conceivable that the two parts consisting of the cylinder and the screws are caulked and integrated, but the accuracy of the caulking part becomes a problem,
At the same time, there arises a problem that the cost becomes high.

Therefore, the present invention solves the drawbacks of the prior art as described above, has a good operability, does not grow gingiva on the upper part in the healing process, and can be manufactured at a low cost. Is intended to provide. Therefore, an object of the present invention is to solve these problems mentioned above.

[0010]

As a solution to the above-mentioned problems, the present invention provides a "healing upper structure for a double implant, which comprises (A) an outer surface and a part thereof that come into contact with the gingiva. A cylindrical body having an inner surface provided with a female screw portion, and (B) a round bar having a male screw portion of 3 pitches or more screwed into both the female screw portion of the inner surface of the cylinder and the female screw portion of the implant post hole. Part, a head capable of fixing the tubular body to the implant after screwing, on the male thread portion side of the round bar portion between the head portion and the male thread portion, longer than the length of the female thread portion on the inner surface of the barrel, And a fixing screw having a small-diameter round bar portion having a diameter smaller than the inner diameter, the diameter of the upper surface of the implant is substantially equal to the diameter of the lower surface of the tubular body, and both surfaces are in contact with each other in whole or in part. And a healing superstructure (claim 1).

Further, according to the present invention, in the above healing upper structure, "a healing upper structure in which the diameter of the head of the fixing screw is larger than the diameter of the upper surface of the cylinder (claim 2)",
"In the fixing screw, a healing upper structure having a round bar portion having a diameter slightly smaller than the through hole diameter of the upper portion of the tubular body between the head portion and the small diameter round bar portion (claim 3)", " An upper surface for healing is provided on the inner surface of the lower side of the tubular body that fits with the projection fitting portion of the implant upper surface (claim 4). "Healing upper structure having an outer surface shape fitted to the recessed upper structure fitting portion (claim 5)", "Healing upper part of the fixing screw having an end rod tip at its end Structure (Claim 6) "as well as" Curtaining upper structure composed of one or more metals of titanium, titanium alloy, and stainless steel (Claim 7) "are also provided. .

[0012]

The upper structure for healing according to the present invention has good operability, as will be described in detail in the following examples, by the constitution of the (A) cylindrical body and the (B) fixing screw as described above. In the healing process, gingiva does not grow on the upper part of the healing process, and the manufacturing is possible at low cost.

Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited thereto.

[0014]

EXAMPLES Examples will be described with reference to FIGS. 1 to 4.
FIG. 1 shows an implant (1) as an embodiment of the present invention.
FIG. 3 is a schematic side view of an example and a cylindrical body (2) and a fixing screw (3). Here, the implant (1) is implanted in the jawbone. 2 is a schematic cross-sectional view of the implant (1) of FIG. The implant (1) has a fitting protrusion (1a) provided on the implant upper surface (1b) having a diameter D1.
And a post hole (1c) opened through the fitting protrusion (1a) and a female screw part (1) inside the post hole (1c).
d).

FIG. 3 is a schematic sectional view of the cylindrical body (2) shown in FIG. The tubular body (2) has an outer surface (2) that comes into contact with the gingiva after fastening.
a), an inner surface, a cylindrical body upper surface (2e) having a diameter D3, and a cylindrical body lower surface (2f) having a diameter D2. The inner surface has a fool hole (2b), a two-pitch female screw portion (2c), and a fitting hole (2b) that fits with the fitting protrusion (1a) of the implant (1).

FIG. 4 is a schematic sectional view of the fixing screw (3) shown in FIG. The fixing screw (3) has a head (3
a), a round bar part (3b), a small diameter round bar part (3c), and 5
It is provided with a male thread portion (3d) of the pitch, an end rod tip (3e), and a driver insertion hole (3f) for rotating the fixing screw (3). The method of fastening the healing upper structure to the implant (1) will be described. First, the fixing screw (3) is screwed and connected to the tubular body (2). At this time, the male screw portion (3d) of the fixing screw (3) penetrates the female screw portion (2c) of the tubular body (2). next,
Insert the end rod tip (3e) of the fixing screw (3) into the post hole (1c) of the implant (1), and insert the screwdriver into the screwdriver insertion hole (3f) of the head of the fixing screw (3). , Rotate and fasten the healing superstructure to the post hole (1c) of the implant (1).

In the above construction, it is preferable that the outer surface (2a) of the cylindrical body contacting the gingiva is polished to improve the affinity with the gingiva. The diameter D1 of the implant upper surface (1b) and the lower surface diameter D2 of the tubular body (2) are substantially equal, and both surfaces are in contact with the entire surface or a part of the surface so that there is almost no gap. The head (3a) of the fixing screw (3) may have any shape as long as it can fix the tubular body (2) to the implant (1). In addition, the head portion (3a) of the fixing screw (3) is fastened to the implant (1), and then, the head portion (3a) is fixed to the hollow hole (2
It may be in the space of b) or the upper surface (2) of the cylindrical body (2).
e), the diameter D of the upper surface of the cylinder (2e), which may be in contact with
It is preferable that the diameter D4 of the head portion (3a) of the fixing screw (3) is larger than 3.

When the healing upper structure is fastened to the implant (1), the fixing screw (3) is screwed into the female screw portion (2c) of the tubular body (2), and these two parts are connected in advance. Then, at this time, the male screw portion (3d) of the fixing screw (3) penetrates the female screw portion (2c) of the tubular body (2). Therefore, the female screw portion (2c) of the tubular body (2) is
It is only for fixing the fixing screw (3) so that it is not disassembled when it is attached to the implant (1), so it is enough that the thread has 1 pitch or more and 5 pitches or more than necessary. You don't need many threads.
The healing superstructure thus connected is screwed into the post hole (1c) of the implant (1). At this time, if a screwdriver insertion hole (3f) such as a hexagonal hole or a slot is provided on the top surface of the head (3a) of the fixing screw (3), it is easy to use this hole for fastening. Becomes

The outer surface of the cylinder (2) is close to the shape of the outer surface of the upper structure such as the crown portion to be mounted after healing of the gingiva, and whether the cylinder upper surface diameter D3 is larger than the cylinder lower surface diameter D2. It is preferable that they are equal. Furthermore, the cylindrical body upper surface diameter D3
By making the screw head diameter D4 of the fixing screw (3) larger than that of the fixing screw (3), the head (3) of the fixing screw (3) is increased during the healing period.
The growth of gingiva on the top surface of a) can be prevented.

Further, the implant (1) and the fixing screw (3) are screwed together at 3 pitches or more in order to secure the fastening force, but it is not necessary to screw them at more pitches than necessary, for example, 8 pitches. However, the operability in the oral cavity is deteriorated. Prepare several types of tube length according to the thickness of the gingiva. Further, in order to effectively prevent the gingiva from growing on the top surface of the head (3a) of the fixing screw (3), the screw head diameter D4 is larger than the cylindrical body upper surface diameter D3 by 0.5 mm or more. Although it is preferable, if it is too large, for example, it will come into contact with the adjacent tooth and it will not be attached, so it is not necessary to make it larger than necessary. Furthermore, the height at which the main healing superstructure protrudes from the upper surface of the gingiva after the main healing superstructure is mounted must not hit the mating teeth that bite with it, and the chewing force can be applied to the implant when eating, for example. It will be loaded, and it may adversely affect the healing of the gingiva and the implant, so it should not be made higher than necessary. A round bar (3b) having a diameter slightly smaller than the diameter of the fool hole (2b) in the upper part of the cylinder is provided between the head (3a) of the fixing screw (3) and the small diameter round bar (3c). As a result, the operability during screwing is improved and the strength of the fixing screw (3) is improved.

On the implant upper surface (1b), a protruding fitting protrusion (1a) for fitting with the upper structure, for example, a cross section perpendicular to the implant long axis is a circle, an ellipse, a polygon, or the like, and is tapered. Fitting protrusion (1
If a) is present, by providing a fitting hole (2d) having an inner surface shape to be fitted thereinto on the inner surface of the cylindrical body 2, operability at the time of fastening and functionality after mounting are improved.

Similarly, a recessed fitting recess for fitting the upper structure on the upper surface (1b) of the implant, for example, a cross section perpendicular to the implant long axis is a circle, an ellipse, a polygon, or the like, and is tapered. If there is a fitting depression having a shape that may be attached, a protrusion that fits the fitting depression is provided on the lower outer surface of the cylindrical body to improve operability at the time of fastening and functionality after mounting. At this time, when the implant (1) does not have the fitting protrusion (1a) or the fitting depression, the tubular body (2)
It is not necessary to attach a fitting hole (2d) or a protrusion to the hole, but it may be a fool hole.

Further, by providing an end rod tip (3e) at the end of the fixing screw (3), when the end screw tip (3e) is fastened to the implant (1), the end rod tip (3e) is the implant (1).
It fits easily into the post hole (1c) of
The direction of screwing is also clear, and operability is greatly improved.
Ceramics such as alumina and zirconia can be used as the material of the healing upper structure, but metals such as titanium, titanium alloys and stainless steel are preferable in view of machinability. Titanium is most suitable for the tubular body (2) that comes into contact with the gums. Thus, the implant (1) and the tubular body (2)
Are fixed with fixing screws (3). By the way, when the implant (1) has a fitting projection (1a) for fitting with the upper structure, two pieces of the tubular body (2) and the fixing screw (3) are preliminarily connected to each other, and the fixing screw (3) is The small-diameter round bar portion (3c) can penetrate the female screw portion (2c) of the cylinder, and since its length is longer than the length of the female screw portion (2c), the male screw portion (3d).
Can be located in the space of the fitting hole (2d) of the tubular body (2). At this time, if the male screw portion (3d) is set to, for example, 3 pitches, it can be fastened to the implant 1 by only 3 rotations, and the operability is very good. The same applies when the implant (1) has a depression.

In the conventional integrated healing superstructure, since the male screw portion cannot be located in the space of the hollow hole due to processing problems, even if the pitch is reduced, the post hole () of the implant (1) ( 1c) must be rotated a lot and screwed into place. As described above, the present invention has improved operability and can be provided at low cost, as compared with the conventional integrated upper structure for healing. Also,
The shape of the head (3e) of the fixing screw (3) and the shape of the upper surface (2e) of the cylindrical body which is fitted to the head (3e) may be any shape, but there is no gap in the connecting portion exposed in the oral cavity or it should be minimized. must not.

In fact, for comparison, a conventional integral healing superstructure of the same shape to be fastened to the implant 1 and also a healing superstructure without round bar (3b) and end rod tip (3e). Was prepared and compared with this example. As a result, it was confirmed that the examples of the present invention were very excellent in operability. At the same time, it could be manufactured at low cost.

[0026]

As described above in detail, according to the present invention, the operability is excellent, and the healing upper structure in which gingiva does not grow on the upper part of the healing upper structure during the healing process can be manufactured at low cost. . As a result, it can be expected that the success rate of the secondary surgery and the subsequent functional rate will be improved.

[Brief description of drawings]

FIG. 1 is a schematic side view of an implant as an embodiment of the present invention, a cylinder and a fixing screw.

2 is a schematic cross-sectional view of the implant of FIG.

3 is a schematic cross-sectional view of the cylindrical body of FIG.

FIG. 4 is a schematic cross-sectional view of the fixing screw shown in FIG.

[Explanation of Codes] 1 Implant 1a Fitting protrusion 1b Implant upper surface 1c Post hole 1d Female threaded portion 2 Cylindrical body 2a Cylindrical outer surface 2b Facsimile hole 2c Female threaded portion 2d Fitting hole 2e Cylindrical upper surface 2f Cylindrical body lower surface 3 Fixed Screw 3a Head 3b Round bar 3c Small diameter round bar 3d Male thread 3e End bar 3f Driver insertion hole D1 Top diameter of implant D2 Bottom diameter of cylinder D3 Top diameter of cylinder D4 Screw head diameter

Claims (7)

[Claims] 1. A healing superstructure of a double-dose intraosseous implant, comprising: (A) a cylindrical body having an outer surface in contact with the gingiva and an inner surface partially provided with a female screw; A round bar portion having a male screw portion of 3 pitches or more that is screwed into both the female screw portion on the inner surface of the cylinder and the female screw portion of the post hole of the intraosseous implant, and the cylinder is fixed to the intraosseous implant after screwing. And a small-diameter round bar with a diameter longer than the length of the female thread on the inner surface of the cylinder and smaller than the inner diameter on the male thread side of the round bar between this head and the male thread. An upper structure for healing comprising a fixing screw having a diameter of an upper surface of the intraosseous implant and a diameter of a lower surface of the tubular body which are substantially equal to each other, and both surfaces abut on each other in whole or in part. 2. The healing upper structure according to claim 1, wherein the diameter of the head of the fixing screw is larger than the diameter of the upper surface of the cylindrical body. 3. The fixing screw has a round bar portion having a diameter slightly smaller than the diameter of the through hole in the upper portion of the cylinder between the head portion and the small diameter round bar portion. 2. Healing superstructure. 4. The healing according to claim 1, wherein the lower inner surface of the tubular body is provided with an inner surface shape that fits into a protruding fitting portion on the upper surface of the intraosseous implant. For superstructure. 5. The healing upper part according to claim 1, wherein the lower outer surface of the cylindrical body is provided with an outer surface shape that fits into a recessed fitting portion of the upper surface of the intraosseous implant. Structure. 6. The healing upper structure according to claim 1, wherein an end rod tip is provided at an end of the fixing screw. 7. The healing upper structure according to claim 1, wherein the healing upper structure is made of one or more metals of titanium, titanium alloy, and stainless steel.