JPH10243949A - Dental implant constitution body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To arbitrarily set the angle of the rotating direction of a head, to obstruct the movement in the rotating direction of the head after fixation and to strongly connect the head and an implant main body in an implant constitution body provided with an angle type head. SOLUTION: The fitting recessed part 15 of the implant main body 10 forms a truncated conical shape for which the diameter of a cross section becomes smaller from the upper part to lower part of the longitudinal axis and the fitting projection part 32 of the head 30 forms the truncated conical shape fittable to the fitting recessed part 15 in the truncated conical shape. A connection pin 20 is provided with a tapered part and the connection pin hole 33 of the head 30 is provided with the tapered part 37 corresponding to the tapered part 26 of the connection pin 20. When the head 30 is fixed to the implant main body 10 by the connection pin 20, the fitting recessed part 15 and the fitting projection part 32 are fitted and the tapered part 26 of the connection pin 20 is integrated with the tapered part 37 of the connection pin hole 33 in an abutted and pressurized state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dental implant structure, and more particularly to a connection structure for enhancing the integrity of a head forming an implant structure and an implant body.

[0002]

2. Description of the Related Art An implant structure generally comprises an implant body which is embedded in an implant hole drilled in a jaw bone, and a head which appears on the gingiva and for attaching a denture. Conventional implant components are known as a one-piece type in which an implant body and a head are integrated, and a two-piece type in which a head having a thread is connected to a head of an implant body having a thread groove by screwing into the head. I have. Furthermore, as a three-piece type improved from the two-piece type, a type in which an implant body and a head are fitted and then both are connected and fixed by a threaded pin has been proposed.

FIG. 4 is a view showing an example of a three-piece implant structure disclosed in Japanese Patent Application Laid-Open No. Hei 7-313529. FIG. 4A is a schematic partially cutaway sectional view showing the implant constituent body 200 installed in the oral cavity. In this conventional implant component 200, after the implant main body 210 and the head 230 are fitted, the two are connected and fixed by the connection pin 220. FIG. 4 (B)
As shown in FIG. 7, a pin hole 233 is formed in the head portion 230 in the longitudinal axis direction, and a connection pin 220 provided with a fixing thread 225 at the tip is passed through the pin hole 233 and provided in the implant body 210. Into the fixing screw groove 216. This structure is effective in preventing loosening of the head 230 and realizing a strong connection. Further, the implant main body 210 and the head 230 are fitted together by a fitting concave portion 215 and a fitting convex portion 232 having a polygonal cross section. The head 230 having an inclined portion having an inclination shown in this example takes into account the inclination of the teeth. further,
By setting the cross section of the fitting portion between the implant main body 210 and the head portion 230 to be polygonal (in the example, hexagonal), the angle of the tooth can be adjusted (in the example, every 30 degrees). The implant main body 210 shown in FIG. 4 has a smooth curved surface at the periphery of its head, so that it has an excellent tongue feeling.
2 around the implant body 2
It is very easy to implant 10 in the gingiva and a stable prognosis is ensured.

[0004]

As described above, the implant structure having the angle type head shown in FIG.
Although it has an excellent structure, the fitting protrusion 232 of the head 230
And the fitting recess 215 of the implant body 210,
Both require machining to be polygonal in cross section, and the mating surfaces of both must fit very accurately. If an unexpected gap is generated, stable coupling cannot be obtained, and infection may be caused by invasion of a foreign substance or the like. Therefore, it is necessary to form both fitting surfaces extremely accurately. Further, in the three-piece type, since the connection between the head and the implant main body depends only on the connection pins, it is required to further secure a firm connection between the two.

Accordingly, an object of the present invention is to provide an implant structure having an angle type head, in which the angle in the rotational direction of the head can be set arbitrarily, and after the fixation, the head is prevented from moving in the rotational direction. To achieve a strong connection between the head and the implant body. Further, a further object of the present invention is to provide a highly accurate integrated component of the implant that can be formed by simple machining in the above-mentioned implant component, thereby realizing an implant component that is integrated with extremely high consistency. The purpose is to prevent infection due to intrusion.

[0006]

According to a first aspect of the present invention, there is provided an implant structure for embedding in a jaw bone, a fitting recess, and a hole formed in the bottom of the fitting recess. An implant main body having a fixing screw groove, a fitting protrusion that can be fitted into the fitting recess of the implant body, a connection pin hole passing through the fitting protrusion, and an inclination with respect to the connection pin hole axis. And a fixing screw thread which is screwed into the fixing screw groove of the implant main body through the connection pin hole of the head to fix the head to the implant main body. In the implant structure comprising a connection pin comprising: the fitting concave portion of the implant body has a truncated conical shape in which the cross-sectional diameter decreases from above to below the longitudinal axis, and
The fitting protrusion of the head has a truncated cone shape that can be fitted with the fitting recess of the truncated cone shape, and the connection pin has a tapered portion whose cross-sectional diameter decreases from above to below the longitudinal axis. And, the connection pin hole of the head has a tapered portion corresponding to the tapered portion of the connection pin,

When the head is fixed to the implant body by the connection pin, the fitting concave portion and the fitting convex portion are fitted together, and the tapered portion of the connection pin is formed into a tapered portion of the connection pin hole. And are integrated in a state of contacting and pressing.

According to a second aspect of the present invention, in the first aspect, the frusto-conical conical surface of the fitting concave portion and the fitting convex portion forms an angle of about 8 degrees with respect to an axis.

[0009] A third aspect of the present invention is the above-mentioned first or second aspect.
In the above aspect, the connection pin and the tapered portion in the connection pin hole form an angle of about 45 degrees with respect to the axis.

According to a fourth aspect of the present invention, in any one of the above aspects, a fine rough surface is formed on the outer peripheral surface of the fitting projection of the head in order to prevent the movement of the head after fixing. .

According to a fifth aspect of the present invention, in any one of the above aspects, the lock is formed so as to make a round around the conical surface with the axis as the center on the truncated conical surface of the fitting recess of the implant body. A recess having a lock projection that circles around the conical surface around an axis on the truncated conical surface of the fitting projection of the head, and the connection pin allows the head to When fixed to the implant body, the fitting concave portion and the fitting convex portion are fitted together, and the lock convex portion is integrated with the lock concave portion in a state of contacting and pressing the lock concave portion.

[0012]

When the fitting concave portion provided on the implant body and the fitting convex portion provided on the head are formed of conical surfaces that fit together, the head can be rotated at an arbitrary angle with respect to the axis. Can be freely selected within a range of 360 degrees. In addition, the fitting between the conical surfaces facilitates insertion, has a wedge action, and provides a strong connection.
At the same time, the matching of the fitting surfaces is good. Most preferably, the inclination angle of the conical surface between the fitting concave portion of the implant body and the fitting convex portion of the head is about 8 degrees with respect to the axis.

Further, the tapered portion provided on the connection pin and the corresponding tapered portion provided on the pin hole of the head portion have a tapered surface on the connection pin side when the head is fixed to the implant body by the connection pin. And presses against it. This creates a force that presses the head against the implant body. This pressing force also acts on the fitting surface between the fitting concave portion and the fitting convex portion, and as a result, an extremely strong connection is realized. Most preferably, the inclination angle of the tapered portion of the connection pin and the pin hole is about 45 degrees with respect to the axis.

Further, by forming a rough surface having fine irregularities on the outer peripheral surface of the fitting projection of the head, the fitting projection of the head and the fitting recess of the implant body are completely fitted. Later, rotational movement about the axis is prevented by the extremely strong frictional force.

Further, the lock concave portion provided on the conical surface on the implant body side and the lock convex portion provided on the conical surface on the head side correspond to each other when the head is fixed to the implant body by the connecting pin. Touch and press each other. This also prevents the head from rotating around the axis.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail by showing some embodiments. FIG. 1 is a schematic development showing an example of an implant structure according to the present invention. 1A is basically composed of three components: an implant body 10, an angle type head 30, and a connecting pin 20. The material is titanium or a titanium alloy or the like. Implant body 10
Is shown in a partially cutaway sectional view.

On the outer periphery of the lower part of the implant body 10, a screw groove 13 for embedding into the jaw bone is provided,
A plurality of slits 12 are provided in the longitudinal axis direction 1 to improve the installation property and stability. This part is blasted to remove and clean the powder and bacteria. The periphery 14 of the head of the implant body 10 has a smooth curve. The head 30 has a connection pin hole 33 through which the connection pin 20 passes. The axis of the connection pin hole 33 is a direction perpendicular to the head lower end surface 36. The head 30 has a substantially cylindrical angle portion 31, and the longitudinal axis of the angle portion 31 is inclined with respect to the axis of the connection pin hole 33. The denture is finally mounted on the head 30. FIG.
(C) is a view of the head 30 as viewed from the bottom surface side. The connection pin 20 for fixing the head 30 to the implant body 10 has a fixing thread 25 at the tip. FIG. 1B is a view of the connection pin 20 viewed from the upper end face side, in which a hexagonal recess 22 is provided.

The feature of the present invention is that the fitting concave portion 15 of the implant body 10 and the fitting convex portion 32 of the head 30 are formed in a truncated cone shape. Conventionally, this fitting portion is formed in a polygonal column shape. Each of the fitting concave portion 15 and the fitting convex portion 32 has a circular cross section, and has a truncated cone shape in which the diameter of the circle becomes smaller as going from above to below the longitudinal axis. That is, the fitting surface is tapered. As is well known, in the case of tapered surfaces, it is possible to process a surface having good fitting properties more easily than in the case of flat surfaces. Therefore, the fitting portion having the truncated cone shape in the present invention can provide a fitting surface which is easier to process and has higher precision than the fitting portion having the conventional polygonal cross section. That is, since the alignment between the head and the implant main body is improved, an unexpected gap does not occur between them. Thereby, invasion of foreign matter can be avoided and infection can be prevented. In addition, the insertion operation is facilitated by the conical surface. After being finally fixed by the connection pin 20, a large connection strength is obtained by the action of the wedge. Thus, the rotational movement of the fixed head around the axis is prevented. In an embodiment, the optimal angle of inclination of the conical surface with respect to the longitudinal axis is about 8 degrees, but may be in the range of about 6 to 10 degrees.

Further, a feature of the present invention is that the connection pin 20 and the connection pin hole 33 of the head portion have a tapered portion 26 and a tapered portion 37 which come into contact with each other after fixing. The connection pin 20 has a large-diameter portion 24a having a large diameter and a small-diameter portion 24b having a small diameter, and further has a tapered portion 26 between the large-diameter portion 24a and the small-diameter portion 24b. On the other hand, the connection pin hole 33 of the head portion 30 has a corresponding large-diameter portion 33a and a
And a tapered portion 37 between them. After fixing, the large-diameter portions 24a and 33a and the small-diameter portions 24b and 3b of the connection pin 20 and the connection pin hole 33 of the head portion respectively.
3b is fitted, and the tapered portion 26 and the tapered portion 37 come into contact with each other, and are pressed against each other by firmly tightening the connection pin 20. This also prevents rotational movement of the fixed head around the axis. Tapered part 2
The optimum tilt angle for the axes 6, 37 is about 45 degrees, but may be in the range of about 40-60 degrees.

In FIG. 1, arrows indicate the directions in which the three members are assembled. In installation, first, the implant body 10 is embedded in the jaw bone, and then the head 30 is connected to the implant body 1.
Fit to zero. As described above, since the fitting portion has the shape of a truncated cone, the head 30 is rotatable about an axis, and the angle of the head can be set to any angular position within 360 degrees as desired.

More preferably, the fitting projection 3 of the head 30
On the outer peripheral surface of No. 2, a fine rough surface 35 having fine irregularities formed on the surface is formed using a technique such as blasting or etching. In the embodiment, the fine rough surface 35 is formed in a region from the lower end of the outer peripheral surface of the fitting projection 32 to a predetermined height. After the implant main body and the head are fitted and fastened, the fine rough surface 35 exerts an extremely large frictional force, thereby preventing the head 30 from moving in the rotation direction and functions as a strong locking mechanism.

Further, as shown in FIG. 2, a further lock mechanism may be provided to prevent rotation of the head after fixing. A lock recess 1 that makes a round around a conical axis on a truncated conical surface of a fitting recess 15 of an implant body 10.
8 and a locking projection 34 that makes a round around the axis of the pin hole on the truncated conical surface of the fitting projection of the head 30. The lock recess 18 is formed by two surfaces 18a and 18b, and the lock protrusion 34 is also formed by two surfaces 34a and 34b. Lock recess 18
The lock projection 34 and the lock projection 34 are shaped to fit each other.
Even when such a lock concave portion 18 and a lock convex portion 34 are provided, the head can be smoothly inserted into and removed from the implant main body before fixing. Although the lock concave portion 18 and the lock convex portion 34 are slightly exaggerated in the center view of FIG. 2, the lock concave portion 18 and the lock convex portion 34 are partially enlarged as shown in two right circles in FIG. 2. The inclination of the two surfaces forming the projection 34 is such that there is no problem when the head is inserted into and removed from the implant body. When the head 30 is fitted and fixed to the implant main body 10, the lock projection 34 contacts and presses the lock recess 18. This structure also prevents the head from moving in the rotational direction after fixing.

The implant body 10 shown in FIG.
And the head 30 are provided with a lock concave portion 18 and a lock convex portion 34.
The portion of the conical surface other than the portion has the same inclination (i.e., preferably about 8 degrees with respect to the axis) as the implant body and the head shown in FIG. Therefore, FIG.
The implant body 10 provided with the lock concave portion 18 in the head 3 shown in FIG.
0 can be handled, and there is versatility.

FIG. 3 shows the implant body 10 and the head 3.
FIG. 2 is a schematic partial cross-sectional configuration diagram of the implant component 100 after fixing and integration with a connection pin 20. At the time of assembly, after the implant main body 10 and the head 30 are fitted, the connection pin 20 is connected to the connection pin hole 33 of the head 30.
Then, the fixing screw thread 25 of the connection pin 20 is screwed into the corresponding fixing screw groove 16 provided at the bottom of the fitting recess of the main body 10 and further tightened. At the time of screwing and fastening, a hexagon wrench or the like is inserted into a hexagon hole at the upper end of the connection pin 20 and turned. Thus, the implant body 10,
The head 30 and the connecting pin 20 are used for the implant construct 1
00 is integrated. In this state, the longitudinal axis of the implant body 10, the axis of the connection pin 20, and the axis of the connection pin hole of the head 30 coincide. The important point is that when the connection pin 20 is tightly tightened, the tapered portion 26 of the connection pin 20 comes into contact with the tapered portion 37 of the connection pin hole 33 of the head, and the tapered portion 26 presses the tapered portion 37. It is to become. That is, the connection pin 20 is connected to the head 3
0 is applied to the implant body 10. Further, the pressing force effectively acts on the conical fitting surfaces 32 and 15 of the head 30 and the implant body 10 to exert a strong coupling force. At the same time, this pressing force effectively acts on the fine rough surface 35 on the outer peripheral surface of the lower end of the head 30. As described above, the implant structure 100 according to the present invention is extremely firmly integrated by the characteristic connection structures between the components that function synergistically with each other.

[0025]

As described above, in the implant structure of the present invention, the fitting portion between the implant body and the head has a truncated conical shape, and the connection pins and the connection pin holes of the head are provided with corresponding tapered portions. A fine rough surface was provided on the outer peripheral surface of the lower end of the head. Preferably, a lock concave portion and a lock convex portion are provided on the conical surface of the fitting portion between the implant body and the head. As a result, when the head and the implant body are fixed and fastened by the connection pins, a strong connection is realized in which the surfaces of the fitting portion, the tapered portion, and / or the lock uneven portion abut against each other and press each other. .

Therefore, it is possible to set the angle type head at an arbitrary rotation angle, and to reliably prevent the head from moving in the rotation direction after fixing. Further, the tapered structure according to the present invention can provide a highly accurate fitting surface with high accuracy by simple machining compared to the conventional polygonal cross-section structure. Not only that, the head can be inserted and removed smoothly, and workability has been improved. In addition, since the installation operation of the implant structure of the present invention is simple, no special technique is required.

[Brief description of the drawings]

FIG. 1 is a schematic exploded view showing components of an example of an implant structure according to the present invention.

FIG. 2 is a partially enlarged view showing another example of the fitting portion of the component of the implant structure according to the present invention, and the inside of two right circles is a further partially enlarged view.

FIG. 3 is a schematic partially cut-away sectional view of an assembled state of the implant component of FIG. 1;

FIG. 4 is a view showing an example of a conventional implant structure, in which (A) is a partially cutaway sectional view in an installed state,
(B) is a side view of the head.

[Explanation of symbols]

 Reference Signs List 10 implant body 11, 211 body tip 12, 212 body slit 13, 213 body thread 15, 215 fitting recess 16, 216 fixing screw groove 18 lock recess 20, 220 connection pin 22 hexagon recess 24a pin large diameter portion 24b Pin small diameter part 25,225 Fixing screw thread 26 Pin taper part 30,230 Head 31 Angle part 32,232 Fitting convex part 33,233 Pin hole 33a Pin hole large diameter part 33b Pin hole small diameter part 34 Lock convex part 35 Fine coarse Surface 37 Pin hole taper 38 Slit 100, 200 Implant composition 250 Gingiva

Claims (5)

[Claims] 1. An implant body having a screw thread for embedding in a jaw bone, a fitting recess, and a fixing screw groove formed in the bottom of the fitting recess, and can be fitted into the fitting recess of the implant body. A head having a fitting projection, a connection pin hole penetrating the fitting projection, and an angled portion inclined with respect to the axis of the connection pin hole, and the head for fixing the head to the implant body. A connection pin having a fixing screw thread that is screwed into the fixing screw groove of the implant body through the connection pin hole of the implant body, wherein the fitting recess of the implant body is The cross-section has a truncated cone shape in which the diameter of the cross section decreases from above to below the longitudinal axis, and the fitting projection of the head has a truncated cone shape capable of fitting with the fitting recess of the truncated cone. None, the connection pin is disconnected Has a tapered portion whose diameter decreases from above to below the longitudinal axis, and the connection pin hole of the head has a tapered portion corresponding to the tapered portion of the connection pin. When the head is fixed to the implant main body, the fitting concave portion and the fitting convex portion fit together, and the tapered portion of the connection pin abuts against and presses the tapered portion of the connection pin hole. An implant construct characterized in that it is integrated in a state. 2. The implant construction according to claim 1, wherein the frusto-conical conical surfaces of the fitting recess and the fitting projection form an angle of about 8 degrees with respect to an axis. 3. The implant assembly according to claim 1, wherein each of the connection pins and each tapered portion of the connection pin hole forms an angle of about 45 degrees with respect to an axis. 4. The head according to claim 1, wherein a fine rough surface is formed on an outer peripheral surface of the fitting projection of the head so as to prevent the movement of the head after fixing. Implant composition. 5. A locking recess which makes a round on the conical surface around an axis on the frusto-conical conical surface of the fitting concave portion of the implant main body, wherein the fitting convex portion of the head has On the conical surface of the truncated cone, having a lock convex portion that makes a round around the conical surface around an axis, when the head is fixed to the implant body by the connection pin, the fitting concave portion and the The implant structure according to any one of the preceding claims, wherein the fitting convex portion is fitted, and the lock convex portion is integrated with the lock concave portion in a state of contacting and pressing the lock concave portion.