JP7572165B2 - Dental screwdriver - Google Patents

Description

This disclosure relates to a dental driver used in implant treatment.

Implant treatment, in which artificial teeth are placed in the oral cavity, is attracting attention. In implant treatment, a fixture that is fixed to the alveolar bone and an abutment that acts as a support for fixing the prosthesis to the fixture are fastened together with a screw.

When the fixture and abutment fit together at their tapered portions, the abutment may bite into the fixture, making it impossible to remove the abutment from the fixture even when the screw is released with a screwdriver. If the abutment cannot be removed from the fixture using forceps or other tools, an abutment extractor is used. The abutment extractor rocks the abutment after removing the screw, and then removes the abutment. For this reason, there is a concern that the fixture and other parts may be damaged during the removal operation.

Patent document 1 discloses a dental tool that is used when it is difficult to remove an abutment from a fixture.

JP 2003-236855 A (published on November 28, 2013)

However, the technology in Patent Document 1 has the following problems:

Specifically, the technology of Patent Document 1 requires a jig when the abutment cannot be removed from the fixture with a driver. In addition, the technology of Patent Document 1 raises concerns that the use of a jig may impose a burden on the patient or cause damage to the fixture, etc.

One aspect of the present invention was made in consideration of the above problems, and its purpose is to provide a dental driver that makes it easy to remove an abutment from a fixture.

In order to solve the above problem, a driver according to one embodiment of the present disclosure is a dental driver used in implant treatment, and is configured to include a tip portion that is inserted into the drive portion of a screw that fixes an abutment to a fixture, and a shaft portion that rotates the tip portion and contacts the abutment when the central axis of the screw and the rotation axis of the tip portion are aligned.

In order to solve the above problem, a driver according to one embodiment of the present disclosure is a dental driver used in implant treatment, and is configured to include a tip portion that is inserted into the drive portion of a screw that fixes an abutment to a fixture, a shaft portion that rotates the tip portion, and an attachment that is detachable from the shaft portion, is attached to the shaft portion, and contacts the abutment when the central axis of the screw and the rotation axis of the tip portion are aligned.

According to one aspect of the present disclosure, the abutment can be easily removed from the fixture.

FIG. 2 is a schematic diagram of a driver according to the present disclosure. 1 is a schematic diagram showing a state in which a tip of a driver according to the present disclosure is inserted into a screw drive portion. 13 is a schematic diagram showing a state in which the tip of another driver according to the present disclosure is inserted into a screw drive portion. 13 is a schematic diagram of a main portion of another driver according to the present disclosure, showing how a shaft portion of the driver contacts an abutment. FIG. 13 is a schematic diagram of a main portion of another driver according to the present disclosure showing an attachment contacting an abutment. FIG.

Below, an embodiment of the present disclosure will be described with reference to the drawings. The embodiment described below is one example of a means for realizing the present disclosure, and should be appropriately modified or changed depending on various conditions. The present disclosure is not limited to the following embodiment. In addition, in the drawings described below, identical or functionally similar components are given the same reference numerals, and repeated description thereof will be omitted.

[Implant treatment]
Implant treatment is a treatment method for replacing teeth by embedding an artificial tooth root (implant) in a place where a tooth has been lost. An implant is mainly composed of a main body (fixture), a tooth base (abutment), and an upper prosthesis. In implant treatment, first, a surgery is performed to embed the fixture in the alveolar bone. After several weeks to several months have passed since the surgery, the fixture is integrated with the alveolar bone with sufficient strength. Next, in a second surgery, the abutment is taper-fitted to the upper part of the fixture, and a fastening screw (hereinafter also simply referred to as a screw) is inserted through the abutment hole. Then, the fixture and the abutment are fastened with the fastening screw using a dental driver. At this time, an upper prosthesis tailored to each individual patient is attached to the abutment. The upper prosthesis may be, for example, an artificial crown part (i.e., the part of the tooth exposed in the oral cavity).

After the second surgery, the patient will be able to chew food normally. However, some time after surgery, it may become necessary to remove the abutment due to reasons such as damage to the artificial crown.

The dental drivers disclosed herein can be used with any known fixtures, abutments, and screws. Therefore, detailed descriptions of fixtures, abutments, and screws will be omitted.

[Driver 1]
Hereinafter, the driver 1 according to the present disclosure will be described in detail with reference to FIG.

1 is a schematic diagram of a dental driver 1' according to the prior art and a driver 1 according to the present disclosure, viewed from a certain side direction. The drivers 1' and 1 are dental drivers used for implant treatment. The drivers 1' and 1 are made of, for example, stainless steel. The conventional driver 1' is used to fasten the abutment 10 and the fixture 20 with a screw 30, and the driver 1 is used to loosen the screw 30 and remove the abutment 10 from the fixture 20. The drivers 1' and 1 are driven by the user's fingers or a surgical motor (not shown). The drivers 1' and 1 have the same configurations of the surgical motor connection part 2, the grip part 3, and the tip part 5, but the configurations of the shaft part 4' and the shaft part 4 are different. That is, in the conventional driver 1', the shaft part 4' is rotationally symmetric about the rotation axis RA, but the shaft part 4 is not rotationally symmetric. The configuration of the shaft part 4 will be described later.

The surgical motor connection part 2 connects to the surgical motor and transmits the driving force of the surgical motor to the grip part 3. The surgical motor connection part 2 may have any shape that can be connected to the surgical motor. If the driving force is applied to the driver 1 by the dentist's hand rather than by a surgical motor, the driver 1 does not need to be equipped with the surgical motor connection part 2.

The gripping portion 3 transmits the driving force of the surgical motor obtained from the surgical motor connecting portion 2 to the shaft portion 4 and the tip portion 5. The gripping portion 3 is where the dentist primarily holds the driver 1 during dental treatment. The gripping portion 3 is disposed on the rotation axis RA of the tip portion 5, and it is preferable that the central axis of the gripping portion 3 is the same as the rotation axis RA. This positions the central point of the rotational driving force applied to the driver 1 on the rotation axis RA, making it easier for the dentist to use the driver 1.

The shaft portion 4 transmits the driving force of the surgical motor obtained from the grip portion 3 to the tip portion 5. The shaft portion 4 will be described with reference to FIG. 2.

The tip portion 5 is inserted into the drive portion (screw head) of the screw 30 that fixes the abutment 10 to the fixture 20, and transmits the driving force of the surgical motor obtained from the shaft portion 4 to the screw 30. The tip portion 5 is formed into a shape that fits the drive portion of the screw 30.

Figure 2 is a schematic diagram showing the state in which the tip 5 of the driver 1 according to the present disclosure is inserted into the drive part of the screw 30. Figure 2 is a schematic diagram of the driver 1 viewed from a different side direction than that of Figure 1. The surgical motor connection part 2 and the grip part 3 are shown in simplified form. Figure 2 shows the state in which the central axis CA of the screw 30 and the rotation axis RA of the tip 5 are aligned. In this state, the shaft part 4 comes into contact with the abutment 10. This will be explained in more detail below.

As described above, the grip portion 3 is on the rotation axis RA of the tip portion 5 and is parallel to the rotation axis RA. The shaft portion 4 is provided between the grip portion 3 and the tip portion 5. The shaft portion 4 is inclined with respect to the rotation axis RA of the tip portion 5. As a result, the shaft portion 4 contacts the abutment 10 in a state in which the central axis CA of the screw 30 and the rotation axis RA of the tip portion 5 are aligned. For example, the shaft portion 4 is inclined with respect to the rotation axis RA of the tip portion 5 from the connection portion with the grip portion 3 to the connection portion with the tip portion 5. With this configuration, the inclination of the shaft portion 4 with respect to the rotation axis RA is the most gentle, and the shaft portion 4 contacts the abutment 10 gently. This configuration is one example, and the inclination angle of the shaft portion 4 with respect to the rotation axis RA can be changed as appropriate. With the above configuration, the driver 1 has the following effects.

In implant treatment, the abutment 10 and fixture 20 are fastened together by a screw 30. When the abutment 10 and fixture 20 are fitted together at their tapered portions 40 (Fig. 2), the following problem occurs. Specifically, the abutment 10 may bite into the fixture 20, making it difficult to remove the abutment 10 from the fixture 20 even if the screw 30 is released using a conventional driver 1'.

In this regard, in the driver 1, when the central axis CA of the screw 30 and the rotation axis RA of the tip 5 are aligned, the shank 4 comes into contact with the abutment 10. Therefore, while the screw 30 is being released by the surgical motor, the shank 4 continues to come into contact with the inner wall of the abutment hole 11 of the abutment 10. The contact position between the shank 4 and the inner wall of the abutment hole 11 changes with the rotation of the driver 1, exerting a force that rocks the abutment 10. This makes it easier to remove the engagement between the abutment 10 and the fixture 20. As a result, it becomes unnecessary to use an abutment extractor or jig, and it is also possible to prevent damage to the fixture that may occur when an abutment extractor is used.

In conventional implant treatment, dentists sometimes adopt a method in which the shaft of a driver is brought into contact with the abutment and the abutment is swung when the central axis of the fixture and the rotation axis of the screw are not aligned. However, when the central axis of the fixture and the rotation axis of the screw are not aligned, it is not possible to apply sufficient driving force to the drive part of the screw. Therefore, with such a method, it may not be possible to release the fastening between the fixture and the abutment, or to rotate the screw.

Compared to such conventional implant treatment, implant treatment using the driver 1 according to the present disclosure allows the abutment to be easily removed from the fixture.

As described above, the tip 5 and the shaft 4 are inserted into the abutment hole 11, and therefore their outer diameters are smaller than the inner diameter of the abutment hole 11. The shaft 4 is inclined with respect to the rotation axis RA of the tip 5. Therefore, the distance between the surface of the shaft 4 and the rotation axis RA in a direction perpendicular to the rotation axis RA varies depending on the location, and in this embodiment, the distance between the rotation axis RA and the part of the surface of the shaft 4 farthest from the rotation axis RA is larger than the radius of the abutment hole 11. This configuration allows the shaft 4 to easily come into contact with the inner wall of the abutment hole 11.

The inclination angle of the shaft portion 4 relative to the rotation axis RA can take various values depending on the size of the applicable abutment 10, the inner diameter and length of the abutment hole portion 11, or the diameter of the shaft portion 4. For example, the inclination angle is in the range of 1° to 30°. If the inclination angle exceeds 30°, it becomes difficult to rotate the driver 1 to turn the screw.

The diameter of the driver shaft may be smaller than the inner diameter of the abutment hole 11 as long as the necessary rigidity can be maintained. For example, if the inner diameter of the abutment hole 11 is 3 mm, the diameter of the shaft 4 should be 2.5 mm or less. For example, if the inner diameter of the abutment hole 11 is 2 mm, the diameter of the shaft 4 should be 1.8 mm or less. For example, in order to maintain the necessary rigidity, the diameter of the shaft 4 should be 0.5 mm or more.

[Driver 100]
Next, the driver 100 according to the present disclosure will be described with reference to Fig. 3. In Fig. 3, the surgical motor connecting portion 2 and the gripping portion 3 are shown in simplified form. The same reference numerals are used for members having the same functions as those already described, and the description thereof will not be repeated. This also applies to the description of the driver 200 and the driver 300 according to the present disclosure described later.

3 is a schematic diagram showing a state in which the tip 5 of the driver 100 according to the present disclosure is inserted into the drive unit of the screw 30. The driver 100 is composed of a surgical motor connection part 2, a grip part 3, a shaft part 6, and a tip part 5. The shaft part 6 is curved in a direction away from the rotation axis RA of the tip part 5. Specifically, the shaft part 6 is curved in a direction away from the rotation axis RA of the tip part 5 so as to contact the abutment 10 in a state in which the central axis CA of the screw 30 and the rotation axis RA of the tip part 5 are aligned. With this configuration, the driver 100 can achieve the same effect as the driver 1. The contact position between the shaft part 6 and the abutment 10 may be appropriately determined. In the case where the abutment 10 can be more easily removed from the fixture by contacting the shaft part 6 with the abutment 10 on the lower side of the abutment 10 (the tip part 5 side), the shaft part 6 may be curved closer to the tip part 5 than the grip part 3. In this way, the curve of the shaft 6 can be adjusted in various ways.

As described above, the tip 5 and the shaft 6 are inserted into the abutment hole 11 when in use. Therefore, the outer diameter of the tip 5 and the shaft 6 are smaller than the inner diameter of the abutment hole 11. Because the shaft 6 is curved, the distance between the surface of the shaft 6 and the rotation axis RA in the direction perpendicular to the rotation axis RA varies depending on the location, and in this embodiment, the distance between the surface of the shaft 6 farthest from the rotation axis RA and the rotation axis RA is greater than the radius of the abutment hole 11. This configuration allows the shaft 6 to reliably contact the inner wall of the abutment hole 11.

The diameter of the shank 6, like the shank 4 in the driver 1, may be smaller than the inner diameter of the abutment hole 11 as long as the necessary rigidity can be maintained. For example, if the inner diameter of the abutment hole 11 is 3 mm, the diameter of the shank 6 should be 2.5 mm or less. For example, if the inner diameter of the abutment hole 11 is 2 mm, the diameter of the shank 6 should be 1.8 mm or less. For example, in order to maintain the necessary rigidity, the diameter of the shank 6 should be 0.5 mm or more.

[Driver 200]
Next, the driver 200 according to the present disclosure will be described with reference to Fig. 4. Fig. 4 is a schematic diagram of a main part showing a state in which the shank 7 of the driver 200 according to the present disclosure contacts the abutment 10. The driver 200 differs from the driver 100 in that the shank 6 is replaced with the shank 7.

The shaft portion 7 has a protrusion 7a that protrudes in a direction intersecting with the rotation axis RA of the tip portion 5. Specifically, the protrusion 7a protrudes in a direction intersecting with the rotation axis RA of the tip portion 5 so as to contact the abutment 10 when the central axis CA of the screw 30 and the rotation axis RA of the tip portion 5 are aligned. This allows the driver 100 to achieve the same effect as the driver 1. The protrusion 7a may contact the inner circumference of the abutment 10 at any position. Furthermore, the protrusion 7a may have any shape as long as it is a shape that contacts the abutment 10 when the central axis CA of the screw 30 and the rotation axis RA of the tip portion 5 are aligned.

[Driver 300]
Next, the driver 300 according to the present disclosure will be described with reference to Fig. 5. Fig. 5 is a schematic diagram of a main part showing a state in which the attachment 9 of the driver 300 according to the present disclosure contacts the abutment 10. The driver 300 differs from the driver 1 in that the shaft portion 4 of the driver 1 is replaced with a shaft portion 8 and an attachment 9.

The shaft portion 8 may be parallel to the rotation axis RA. The driver 300 includes an attachment 9 that is detachable from the shaft portion 8. The attachment 9 includes a portion that corresponds to the protrusion 7a, which is disposed at the same position on the shaft as the protrusion 7a and protrudes in the same direction. When the attachment 9 is attached to the shaft portion 8 and the central axis CA of the screw 30 and the rotation axis RA of the tip portion 5 are aligned, the attachment 9 comes into contact with the abutment 10. This allows the driver 300 to achieve the same effect as the driver 1. As an additional effect, the driver 300 can also be suitably used with existing drivers.

The attachment 9 may be made of the same material as the shaft portion 8 or a different material. If the attachment 9 is made of a material with a lower hardness than the abutment 10, such as a resin material such as polycarbonate, PET, nylon, acrylic, or PEEK, the risk of excessive damage to the abutment can be reduced. The attachment 9 may be attached to the shaft portion 8 by any known method. For example, the attachment 9 may be divided into two parts and integrated with the shaft portion 8 in between. Alternatively, the attachment 9 may be attached to the shaft portion 8 using a fixing member such as a screw.

A configuration may be adopted in which the attachment 9 can be attached and detached to the driver 1, driver 100, or driver 200. In that case, the driver 1, driver 100, or driver 200 comes into contact with the abutment 10 at two points, making it easy to remove the abutment 10 from the fixture 20.

〔summary〕
The driver of aspect 1 of the present invention is a dental driver used in implant treatment, and is configured to include a tip portion that is inserted into the drive portion of a screw that fixes an abutment to a fixture, and a shaft portion that rotates the tip portion and contacts the abutment when the central axis of the screw and the rotation axis of the tip portion are aligned.

According to the above configuration, while the screw is being released by, for example, a surgical motor, the shaft portion continues to contact the inner circumference of the abutment, rocking the abutment. This makes it easier to release the engagement between the abutment and the fixture. As a result, it is no longer necessary to use an abutment extractor or jig, and it is also possible to prevent damage to the fixture that may occur when using an abutment extractor.

The driver according to aspect 2 of the present invention may be configured as in aspect 1, in which the shaft portion is curved in a direction away from the rotation axis.

With this configuration, the shaft portion and the abutment can be brought into contact with each other while the central axis of the screw and the rotation axis of the tip portion are aligned, making it easier to release the engagement between the abutment and the fixture.

The driver according to aspect 3 of the present invention may be configured as in aspect 1, in which the shaft portion is inclined with respect to the rotation axis.

With this configuration, the shaft portion and the abutment can be brought into contact with each other while the central axis of the screw and the rotation axis of the tip portion are aligned, making it easier to release the engagement between the abutment and the fixture.

The driver according to aspect 4 of the present invention may be configured as in aspect 1, in which the shaft portion includes a protrusion that protrudes in a direction intersecting with the rotation axis.

With this configuration, the protrusion and the abutment can be brought into contact with each other while the central axis of the screw and the rotation axis of the tip are aligned, making it easier to release the engagement between the abutment and the fixture.

In the driver according to aspect 5 of the present invention, in any of aspects 1 to 4, the shaft portion comes into contact with the inner wall of the abutment hole of the abutment.

With this configuration, the shaft portion can easily come into contact with the inner wall of the abutment hole.

In the driver according to aspect 6 of the present invention, in the above aspect 5, the diameter of the shaft portion is smaller than the inner diameter of the abutment hole portion, and the distance between the rotation axis and the point on the surface of the shaft portion farthest from the rotation axis is greater than the radius of the abutment hole portion.

With this configuration, the shaft portion can easily come into contact with the inner wall of the abutment hole.

The driver according to aspect 5 of the present invention is a dental driver used in implant treatment, and is configured to include a tip portion that is inserted into the drive portion of a screw that fixes an abutment to a fixture, a shaft portion that rotates the tip portion, and an attachment that is detachable from the shaft portion, is attached to the shaft portion, and contacts the abutment when the central axis of the screw and the rotation axis of the tip portion are aligned.

The above configuration can provide the same effects as the drivers according to aspects 1 to 4 described above. Furthermore, because the attachment is detachable from the shaft, the attachment according to aspect 5 can also be used with conventional medical drivers, which is an added benefit.

In the driver according to aspect 8 of the present invention, in the above aspect 7, the diameter of the shaft portion is smaller than the inner diameter of the abutment hole, and the attachment of the shaft portion contacts only a portion of the inner wall of the abutment hole of the abutment.

With this configuration, the abutment can be easily swung by rotating the driver.

The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. The technical scope of the present invention also includes embodiments obtained by appropriately combining the technical means disclosed in different embodiments.

1, 100, 200, 300 Driver 2 Surgical motor connection part 3 Grip part 4, 6, 7, 8 Shaft part 5 Tip part 7a Projection part 9 Attachment 10 Abutment 11 Abutment hole part 20 Fixture 30 Screw 40 Tapered part

Claims (6)

A dental driver used in implant treatment,
A tip that is inserted into the drive part of the screw that fixes the abutment to the fixture;
A shaft portion that rotates the tip portion,
The shaft portion includes a protrusion portion that protrudes in a direction intersecting with a rotation axis of the tip portion ,
A driver , wherein the protrusion contacts the abutment with the central axis of the screw aligned with the rotation axis . The driver of claim 1 , wherein the shank contacts an inner wall of the abutment hole of the abutment. The driver of claim 2, wherein the diameter of the shaft portion is smaller than the inner diameter of the abutment hole portion, and the distance between the rotation axis and the point on the surface of the shaft portion farthest from the rotation axis is greater than the radius of the abutment hole portion. The driver of claim 1, further comprising a gripping portion disposed on the rotation axis of the tip portion. A dental driver used in implant treatment,
A tip that is inserted into the drive part of the screw that fixes the abutment to the fixture;
A shaft portion that rotates the tip portion;
A driver comprising: an attachment that is detachable from the shaft portion, the attachment being attached to the shaft portion and contacting the abutment when the central axis of the screw and the rotation axis of the tip portion are aligned. The driver of claim 5 , wherein the attachment contacts only a portion of an inner wall of the abutment hole of the abutment.

Images