JP2003199773A - Maxillary sinus bottom elevation instrument and its system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a maxillary sinus bottom elevation instrument preventing the detachment of a fixture on the maxilla side and constituted not to make a mistake in the installation direction of the fixture. <P>SOLUTION: A tip rod-like part 2 for pushing up the requested part of the maxilla into a maxillary sinus to form a hole for embedding an artificial tooth root fixture is provided on one end side, and a tapered part 5 enlarged toward the other end is formed at the tip rod-like part 2. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a maxillary sinus floor lifting device and a system thereof for pushing a desired part of the maxilla into a maxillary sinus for forming a hole for burying an artificial dental root fixture in the maxilla. .

[0002]

2. Description of the Related Art When fixing an artificial tooth root fixture (hereinafter abbreviated as a fixture) to a jawbone, the mandible has a sufficient depth to form a hole for burying the fixture. As shown in FIG. 9, the maxillary bone 13 has a small depth from the alveolar crest 11 to the maxillary sinus floor 12a. An instrument 20 as shown in 10 is used to push the maxillary sinus floor 12a inward of the maxillary sinus 12. This is because if the hole penetrates the maxillary sinus 12, there is a risk of bacterial infection.

This instrument 20 is provided with a tip rod portion 21 for pushing up a desired portion of the maxillary bone 13 into the maxillary sinus 12 on the tip side of the grip portion 22, and the tip rod portion 21 has a concave tip surface 23. A cutting edge 24 is formed on the peripheral edge, which is called a maxillary sinus floor lifting device.

After the cortical bone and the interfacial bone at a desired portion of the maxilla 13 are drilled with a drill bar, the maxillary sinus floor raising device 2
0 is pushed up toward the maxillary sinus 12. At this time, the scraped bone is pushed toward the distal end surface 23 side of the distal end rod portion 21 so that the maxillary sinus floor 12a is pushed inward of the maxillary sinus 12. Then, after securing a space for burying the fixture, a desired fixture has been buried.

As shown in FIG. 10, in the apparatus for raising the sinus floor, the tip rod portion 21 is substantially straight (Non-Patent Document 1).

[Non-Patent Document 1] Summers RB, "Sinus floor elevation
with osteotomes ", J. Esthet Dent, 1998; 10 (3): p.1
64-171

[0006]

However, in this device for raising the sinus floor, since the tip rod portion is substantially straight, the bone in the vicinity of the hole wall for mounting the fixture is hardly compressed, and the bone thereof is not compressed. Due to the low density of the bone, the bone had less grip on the fixture. As a result, the fixture may have left.

Further, since the hole formed by the drill bar is not used as a guide, the pushing-up direction of the tip rod portion is apt to be erroneous, and in that case, the direction of the hole formed is also unsuitable.
As a result, the fixture could be turned in the wrong direction.

In view of the above problems, the present invention provides a maxillary sinus floor raising device capable of preventing the fixture from detaching on the maxilla side and preventing the fixture from being installed in the wrong direction. The purpose is to provide.

[0009]

Means for Solving the Problems In order to solve the above-mentioned problems, the maxillary sinus floor raising device of the present invention comprises a tip rod portion for pushing up a desired part of the maxilla into the maxillary sinus at one end side,
It is characterized in that a taper portion is formed on the tip rod portion so as to widen toward the other end.

According to this structure, since the tapered portion compresses the bone near the hole wall for embedding the fixture, the bone density at that portion is increased. As a result, the force with which the bone grips the fixture is increased.

Further, although the tip side of the tip rod-shaped portion (front side of the taper portion) has a small diameter, the diameter is formed small on the hole bottom side. Therefore, on the bottom side of the hole, the adhesion between the fixture and the bone is large, which also increases the force with which the bone grips the fixture. Therefore,
It is possible to prevent the fixture from leaving.

Next, the device for raising the sinus floor of a second aspect of the present invention is characterized in that a plurality of the tapered portions are provided so that the tapered portions are flared in a stepwise manner.

According to this structure, when the maxillary sinus floor lifting device having a gradually increasing diameter is used, it corresponds to the cylindrical portion between the first step taper and the second step taper. With the cylindrical portion of the hole to be used as a guide, the next larger diameter can be inserted. Then, the bone of the hole wall corresponding to the taper of the second and subsequent stages is not cut but is compressed by the taper of the instrument, so that the density of bone particularly near the entrance of the hole becomes high. As a result, the bone in this part can grip the fixture with a very large force.

Next, the device for raising the sinus floor in a third aspect of the present invention is characterized in that a marking line is formed at each tapered end of the tapered portion.

According to this structure, the insertion depth of the maxillary sinus floor lifting device can be visually confirmed.

Further, in the apparatus for raising the sinus floor according to a fourth aspect, the distance from the tip surface of the tip rod portion to the taper portion is 5 to 10 mm.

In this structure, the diameter of the tip end surface of the tip rod portion is matched with the diameter of the pilot hole (pilot hole) formed by the drill bar, and the portion up to the taper portion is used as the pilot portion (guide). The hole can be surely expanded along the prepared hole. This prevents the fixture from being installed in the wrong direction.

According to a fifth aspect of the present invention, there is provided a plurality of maxillary sinus floor elevating instruments, wherein a diameter of a tip surface of the tip rod portion is gradually increased. Each maxillary sinus floor lifting device except for the one with the largest diameter of the tip surface has a cylindrical portion having a diameter between the first-stage taper portion and the second-stage taper portion of the taper portion, The diameter of the tip surface is equal to the diameter of the tip surface of the maxillary floor lifting device.

According to this structure, the next larger diameter can be inserted using the cylindrical portion of the hole corresponding to the cylindrical portion as a guide. Then, the bone of the hole wall corresponding to the taper of the second and subsequent stages is not cut but is compressed by the taper of the instrument, so that the density of bone particularly near the entrance of the hole becomes high. As a result, the bone in this part can grip the fixture with a very large force.

A system of an external sinus floor raising device according to a sixth aspect of the present invention is a finishing upper jaw having a tip rod-shaped portion having a spherical distal end surface on one end side together with the plurality of maxillary sinus floor raising devices. It is characterized in that it includes a sinus raising device.

According to this construction, the bone in the vicinity of the hole wall for fixture insertion is compressed by the tip rod portion of the device for raising the maxillary sinus floor for finishing, and the hole for fixture insertion is formed into the shape of the fixture. Can almost match. As a result, even if the bone in which the fixture is to be embedded is relatively dense from the beginning, the fixture can be embedded very easily.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows three maxillary sinus floor lifting devices 1 according to this embodiment in which the diameter of the tip rod portion is different. The maxillary sinus floor raising device 1 is used together as one system in this embodiment.

It should be noted that in FIG. 1, 0, 2, 6, at the left end,
The numbers 8, 10, 12, 14, 16, and 18 are distance scales (mm) from the tip surface.

Each of the maxillary sinus floor raising devices 1 is provided with a tip rod portion 2 for pushing up a desired portion of the maxilla into the maxillary sinus on the tip side of the grip portion 8, and this tip rod portion 2 has As shown in the cross-sectional view, a cutting edge 4 is formed on the peripheral edge of the concave tip surface 3, and a plurality of the tapered portions 5 are formed so as to spread in a stepwise manner toward the rear. Further, the taper portion 5 of the tip rod portion 2 is 1
The cylindrical portion 5a between the taper portion 5b of the second step and the taper portion 5c of the second step is the next (the diameter of the tip rod portion is the next largest) of the tip surface 3 of the maxillary sinus floor raising device 1. Equal to the diameter. As a material of the maxillary sinus floor raising device 1, a metal material such as stainless steel which is not toxic to the living body can be used.

In the tapered portion 5 of the tip rod portion 2, marking lines (black-painted line portions in FIG. 1) are formed on the tapered ends of the respective tapers 5b and 5c by means of a laser or the like.

3 to 8 are explanatory views for handling the maxillary sinus floor raising device 1. In the embodiment of FIGS. 3 to 8, an example will be described in which a pilot hole of φ1.6 mm is formed and the fixture 6 of φ4.2 mm is finally installed. However, depending on the diameter of the fixture 6 to be installed, the maxillary sinus The diameter and number of the bottom raising device 1 or the form of the tapered portion 5 can be set arbitrarily.

FIG. 3 shows a state in which a pilot hole is formed. After alveolar mucous membrane exfoliation, φ1.
Form a 6 mm pilot hole. At that time, 3 to 4 mm from the maxillary sinus floor 12a that was confirmed on the X-ray in advance.
Drill to a depth that leaves bone.

FIG. 4 shows a state in which the mucosa of the floor of the maxillary sinus is elevated. Insert the φ1.6 mm maxillary sinus floor raising device (the one on the left side in FIG. 1) into the pilot hole, carefully hammer it, and check the marking line attached to the tip rod portion 2 Push to the standard embedment depth of the planned fixture. At that time, be careful not to pierce the mucous membrane of the maxillary sinus floor 12a while always checking the feel of the bone.

FIG. 5 shows a state in which the cavity (fixture embedding hole) thus formed is enlarged. φ 2.1 mm
The above-mentioned maxillary sinus floor raising device (the middle one in FIG. 1) 1 is inserted into the cavity and hammered, and the horizontal expansion is promoted.

FIG. 6 shows a state in which the cavity is further expanded.
The φ2.8 mm maxillary sinus floor raising device (the one on the right side in FIG. 1) 1 is inserted into the cavity and hammered, and further expanded in the horizontal direction. When the bone length is elevated to 14 mm, the cavity entrance is enlarged to a diameter of 3.8 mm.

FIG. 7A shows a state in which the bone prosthetic material 7 is inserted. When the formation of the cavity is completed, the bone filling material 7 such as apatite is gradually inserted into the area directly below the maxillary sinus floor 12a using the maxillary sinus floor raising device 1. As a rule of thumb, fill up to a place about 2 mm shallower than the embedding depth of the fixture.

FIG. 8 shows a state where the fixture is embedded. The fixture 6 is embedded to an appropriate depth in the cavity which is about 2 mm under the inner bone length of the fixture to be embedded by the bone filling material 7. Elevated maxillary sinus floor 12
Carefully complete the implantation so that the bone underneath a and the mucosa of the maxillary sinus floor 12a are not broken.

As is clear from the above embodiment, since the tapered portion 5 compresses the bone near the hole wall for embedding the fixture, the bone density at that portion is increased. As a result, the force with which the bone grips the fixture 6 is increased.

Further, the diameter of the tip side of the tip rod portion 2 of the device 1 for raising the maxillary sinus bottom (the tip side of the taper portion) is small, so that the hole bottom side of the cavity is formed to have a small diameter. For this reason, the adhesion force between the fixture 6 and the bone is large on the hole bottom side, and this also increases the force with which the bone grips the fixture 6. Therefore, the separation of the fixture can be prevented.

According to the system of the mandibular sinus floor raising device 1, a plurality of the maxillary sinus floor raising devices 1 in which the diameter of the tip surface 3 gradually increases are prepared, and the tip surface 3 Each maxillary sinus floor lifting device except for the one having the largest diameter has a cylindrical portion 5a having a diameter between the first-stage tapered portion 5b and the second-stage tapered portion 5c of the taper portion 5 as follows. Since the tip surface 3 is equal to the diameter of the tip surface of the upper jaw raising device 1 having a large diameter, it is possible to insert the next larger diameter using the cylindrical portion of the hole corresponding to the cylindrical portion 5c as a guide. it can. Then, the bone of the hole wall corresponding to the taper 5c of the second step is not cut but is compressed by the taper 5c of the instrument 1, so that the density of the bone particularly near the entrance of the hole becomes high. As a result, the bone in this part can grip the fixture with a very large force.

In addition, in the external sinus floor raising device 1, it is preferable that the distance t from the tip surface 3 of the tip rod portion 2 to the taper portion 5 is 5 to 10 mm. As a result, the portion up to the first-stage tapered portion 5b can be used as a pilot portion and the hole can be surely expanded along the prepared hole. This prevents the fixture 6 from being installed in the wrong direction. If the distance t is less than 5 mm, the direction in which the maxillary sinus floor lifting device 1 is inserted into the cavity may be unstable, while if it exceeds 10 mm, the tapered portion 5 is rearwardly arranged, and The action of increasing the bone density in the region near the hole bottom is weak, and as a result, the force with which the bone grips the fixture 6 may be weakened.

7 (b) and 7 (c) show a finishing maxillary sinus floor lifting device 10 having a tip rod portion 12 having a spherical tip surface 11 on one end side. In FIG. 7A, the tip rod portion is straight, and FIG. 7B is a gentle taper. The maxillary sinus floor lifting device 10 for finishing is used when the bone in which the fixture 6 is embedded is relatively dense from the beginning. In such a case, when the shape of the hole into which the fixture 6 is embedded and the shape of the fixture 6 greatly differ from each other due to the presence of a stepped portion or the like, a large amount of force is required to screw the fixture 6 into the screw. And, there is a risk of causing a fracture during press fitting. Then, the above-mentioned finishing maxillary sinus floor raising device 1 having a spherical tip surface 11
By 0, the bone near the wall of the hole for fixture embedding is compressed, and the hole for fixture embedding is made to substantially match the shape of the fixture 6, so that the fixture 6 can be embedded very easily. It will be possible.

[0039]

As described above, according to the maxillary sinus floor raising device of the present invention, since the tip rod portion is provided with the taper portion, the taper portion allows the bone in the vicinity of the hole wall for fixture insertion. Since the bone is compressed, the density of the bone in that portion increases. As a result, the force with which the bone grips the fixture is increased.

Further, the tip side of the tip rod-shaped part of the device for raising the sinus floor (the part ahead of the taper part) has a small diameter,
Therefore, the hole bottom side is formed to have a small diameter. Therefore, on the bottom side of the hole, the adhesion between the fixture and the bone is large, which also increases the force with which the bone grips the fixture. Therefore, the separation of the fixture can be prevented.

Next, according to the maxillary sinus floor lifting device of claim 2, since the tapered portion is flared in a stepwise manner, the maxillary sinus floor lifting device having a gradually increasing diameter is used. When going forward, the next larger diameter can be inserted using the cylindrical portion of the hole corresponding to the cylindrical portion between the first step tapered portion and the second step tapered portion as a guide.
Then, since the bone of the hole wall corresponding to the taper portion of the second and subsequent stages is not cut and is compressed by the taper of the instrument, the density of the bone particularly near the entrance of the hole becomes high. As a result, the bone in this part can grip the fixture with a very large force.

Next, according to the maxillary sinus floor raising device of claim 3, since the marking line is formed at each tapered end of the tapered portion, the insertion depth of the maxillary sinus floor raising device is visually checked. You can check it at.

Further, according to the apparatus for elevating the sinus floor of claim 4, the distance from the tip surface of the tip rod portion to the taper portion is set to 5 to 10 mm, whereby the tip surface of the tip rod portion is formed. It is possible to surely expand the hole along the pilot hole by using the part up to the taper part as the pilot part (guide) by matching the diameter of the pilot hole with the diameter of the pilot hole drilled with the drill bar. it can. This prevents the fixture from being installed in the wrong direction.

Next, according to the system for elevating the maxillary sinus floor according to claim 5, the diameter of the tip surface of the tip rod portion is gradually increased. A plurality of maxillary sinus floor lifting devices except for the one having the largest diameter of the tip surface are prepared, and the maxillary sinus floor lifting device has a cylindrical part between the taper part of the first step and the taper part of the second step of the taper part. Since the diameter is the same as the diameter of the tip surface of the maxillary bottom lifting device having the next largest tip surface, the one with the next largest tip surface diameter is used with the cylindrical portion of the hole corresponding to the cylindrical portion as a guide. Can be inserted. Then, the bone of the hole wall corresponding to the taper portion of the second and subsequent stages is not cut but is compressed by the taper portion of the device, so that the density of the bone particularly near the entrance of the hole becomes high. As a result, the bone in this part can grip the fixture with a very large force.

Further, the system of the apparatus for raising the sinus floor of the sixth aspect is for finishing, in which, together with the plurality of instruments for raising the sinus floor, a tip rod portion having a spherical tip surface is provided on one end side. Since it includes the maxillary sinus floor lifting device, the bone near the wall for fixture embedding is compressed by the tip rod part of the maxillary sinus floor lifting device for finishing, and the hole for fixture embedding is fixed. The shape of the char can be almost matched. As a result, even if the bone in which the fixture is to be embedded is relatively dense from the beginning, the fixture can be embedded very easily.

[Brief description of drawings]

FIG. 1 shows three maxillary sinus floor lifting devices according to an embodiment of the present invention in which the diameters of the tip rod portions are different.

2 is a cross-sectional view of a region A of FIG.

FIG. 3 is an explanatory diagram showing a state in which a pilot hole is formed.

FIG. 4 is an explanatory view showing a state in which the mucosa of the floor of the maxillary sinus is elevated.

FIG. 5 is an explanatory view showing a state in which a cavity being formed is enlarged.

FIG. 6 is an explanatory diagram showing a state in which a cavity being formed is enlarged.

FIG. 7 (a) is an explanatory view showing a state in which the bone prosthetic material is inserted, and FIGS. 7 (b) and 7 (c) are side views of a finishing upper jaw raising device.

FIG. 8 is an explanatory view showing a state of embedding a fixture.

FIG. 9 is an explanatory view showing the depth from the alveolar crest of the maxilla to the floor of the maxillary sinus.

FIG. 10 is an explanatory view showing a usage state of a conventional maxillary sinus floor raising device.

[Explanation of symbols]

1 Maxillary sinus floor lifting device 2 Tip bar 3 Tip surface 4 cutting edge 5 Tapered part 6 fixture 7 Bone replacement material 10 Maxillary sinus floor lifting device 11 Spherical tip surface 12 Rod-shaped tip

Claims (6)

[Claims] 1. A tip rod-shaped portion for pushing up a desired portion of the maxillary bone into the maxillary sinus is provided at one end side, and a taper portion is formed on this tip rod-shaped portion so as to spread toward the other end side. Characteristic maxillary sinus floor lifting device. 2. The maxillary sinus floor lifting device according to claim 1, wherein a plurality of the taper portions are provided so that the taper portions are flared in a stepwise manner. 3. The maxillary sinus floor lifting device according to claim 2, wherein a marking line is formed at each tapered end of the tapered portion. 4. The maxillary sinus floor lifting device according to claim 1, wherein the distance from the tip surface of the tip rod portion to the tapered portion is 5 to 10 mm. 5. A plurality of maxillary sinus floor raising devices according to claim 2, wherein the diameter of the tip surface of the tip rod portion is gradually increased, and each maxilla except the one having the largest tip surface diameter. The device for raising the sinus floor consists of the first taper part of the taper part and
The diameter of the cylindrical portion between the taper portion of the step is equal to the diameter of the tip surface of the maxillary floor raising instrument having the next largest tip surface diameter. system. 6. A plurality of maxillary sinus floor raising devices,
6. The system for raising the sinus floor of claim 5, further comprising a finishing maxillary sinus floor raising device having a tip rod portion having a spherical tip surface on one end side.