Dental abutment

Abstract

This product provides a dental abutment that is relatively easy to remove even after being attached to an implant. [Solution] A dental abutment 1 comprising a screw head housing portion 3 for housing a screw head, and a female thread portion 5 provided on the upper part of the screw head housing portion 3 and having a groove diameter larger than the diameter of the hole inside the screw head housing portion.

Description

Technical Field

[0001] The present invention relates to an abutment used in dental implants, and more particularly to a dental abutment that is inexpensive to remove.

Background Art

[0002] Japanese Patent No. 6245400 describes an abutment for an implant. In dental implant treatment, an abutment for connecting an implant body implanted in a patient's jawbone to an upper structure plays an important role. In a general abutment, a fixing screw is used, and a structure for reliably accommodating this screw and obtaining appropriate fixing force is required. For this reason, the fixture and the abutment of a dental implant may be firmly connected by taper fitting. When maintaining the implant, the abutment may need to be removed. However, as described above, the implant and the abutment are firmly bonded, making it difficult to remove. And if one tries to remove the abutment forcefully, it may have an adverse effect on the soft tissue and bone tissue around the implant.

[0003] Japanese Unexamined Patent Application Publication No. 2020-31747 describes an abutment removal tool. However, when removing the abutment using this removal tool, a rod-shaped member is pressed against the abutment, so the abutment is loaded and it is difficult to reuse it after maintenance.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Therefore, the purpose of this invention is to provide a dental abutment that is relatively easy to remove and maintain, even after being attached to an implant. [Means for solving the problem]

[0006] This invention is based on the finding that the problem can be solved by providing an internal threaded portion with a root diameter larger than the diameter of the screw head around or above the screw head housing.

[0007] This invention relates to a dental abutment 1. This dental abutment 1 has a screw head housing portion 3 and a female thread portion 5. The screw head housing section 3 is an element for housing the screw head 11. The female thread portion 5 is provided around or above the screw head housing portion 3 and is an element having a root diameter larger than the diameter of the hole inside the screw head housing portion 3. [Effects of the Invention]

[0008] By providing a female threaded portion with a groove diameter larger than the diameter of the screw head around or above the screw head housing, it is possible to provide a dental abutment that is relatively easy to remove and maintain even after being attached to an implant. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 is a conceptual diagram illustrating dental abutments. [Figure 2] Figure 2 is a diagram illustrating an example of a screw head. [Figure 3] Figure 3 is a conceptual diagram showing how an abutment is removed using an abutment remover. [Figure 4]Figure 4 is a conceptual diagram showing how an access hole sealing rod is inserted into the cavity inside the abutment. Figure 4(a) is a conceptual diagram explaining the access hole sealing rod. Figure 4(b) is a conceptual diagram (cross-sectional view) showing how the access hole sealing rod and the abutment are connected. Figure 4(c) is a conceptual diagram showing how the access hole sealing rod is inserted into the abutment through a hole provided in the prosthesis. Figure 4(d) is a conceptual diagram after the shape of the access hole sealing rod has been adjusted. [Figure 5] Figure 5 is a conceptual diagram showing an example of an abutment in which the female thread portion is provided around the screw head housing portion. Figure 5(a) shows an external view of the abutment. Figure 5(b) shows an example of a cross-sectional conceptual diagram of the abutment. Figure 5(c) shows the access hole sealing rod inserted into the abutment. [Figure 6] Figure 6 is a conceptual diagram showing the designed abutment. Figure 6(a) is an external view, and Figure 6(b) is a partial cross-sectional view. [Figure 7] Figure 7 is a conceptual diagram showing how to seal a prosthesis using an access hole sealing rod. Figure 7(a) shows the access hole sealing rod being inserted into the abutment. Figure 7(b) shows the access hole sealing rod protruding from the prosthesis after it has been inserted into the abutment. Figure 7(c) shows the access hole sealing rod being trimmed and then shaped. [Figure 8] Figure 8 is a photograph, which serves as an alternative to a diagram, showing how a dental model was manufactured using a 3D printer and how an implant was formed using an abutment. [Figure 9] Figure 9 is a photograph that replaces the diagram showing the dental model after the implant has been prepared. [Modes for carrying out the invention]

[0010] Figure 1 is a conceptual diagram illustrating a dental abutment. As shown in Figure 1, this dental abutment 1 has a screw head housing 3 and a female threaded portion 5. In the example in Figure 1, there is a relief groove 7. In the example in Figure 1, there is a hollow portion (access hole) that penetrates the dental abutment 1 via the screw head housing 3 and the female threaded portion 5. This hollow portion functions as a passage for easy insertion and removal of the screw. The dental abutment 1 has a hollow portion inside, and the external shape can be any known shape as appropriate. Since the dental abutment 1 is usually for dental use, its size and other specifications can be set appropriately considering the size of the tooth to which it is applied.

[0011] A dental abutment is an element used to connect an implant (artificial tooth root) to a prosthesis (crown, bridge, denture, etc.). Abutments come in various types, such as screw-retained (abutments that secure the prosthesis with a screw), cement-retained (abutments that bond the prosthesis with cement, etc.), and custom abutments (abutments that are individually designed when a special shape is required). Abutment materials include, for example, titanium and zirconia. Since abutments are already well-known, elements of known abutments may be used as appropriate.

[0012] The screw head housing section 3 is an element for housing the screw head 11. The screw head housing section 3 can securely hold the screw head 11.

[0013] Figure 2 is a diagram illustrating an example of a screw head. The screw head 11 of a dental implant is typically a component located on the upper part of the implant (artificial tooth root). The screw head 11 is usually designed in a cylindrical or tapered shape and plays a role in stabilizing the connection between the implant body and the prosthesis (artificial tooth). Examples of materials for the screw head 11 include highly biocompatible materials such as titanium and zirconia. The screw head 11 shown in Figure 2 has a cylindrical body portion 13, a cylindrical head portion 15 located on the upper part of the body portion 13 with a larger diameter than the body portion 13, a threaded portion 17 located on the lower part of the body portion 13, and a tip portion 19 located on the lower part of the threaded portion 17. In this specification, "larger diameter" may mean, for example, a diameter that is 0.1 mm to 5 mm larger, 0.2 mm to 4 mm larger, 0.5 mm to 4 mm larger, or 1 mm to 3 mm larger.

[0014] The screw head housing section 3 in Figure 1 has a shape suitable for housing the screw head 11. The screw head housing section 3 has a body housing section, which is a part for housing the body portion 13 of the screw head 11 (a part having a hole with a diameter the same as or slightly larger than the diameter of the body portion 13, and a hole with a diameter smaller than the diameter of the head portion 15), and a head housing section located above it, which is a part for housing the head portion 15 (a part having a hole with a diameter the same as or slightly larger than the diameter of the head portion 15). Because of this shape, when the screw head 11 is inserted into the screw head housing section 3, it will stop in the appropriate position.

[0015] The female screw part 5 is provided around or above the screw head accommodating part 3 and is an element having a valley diameter larger than the diameter of the screw head 11. In the example of FIG. 1, the female screw part 5 is provided above the screw head accommodating part 3. That is, the female screw part 5 has an internal cavity part forming a female screw. And the diameter of its valley is larger than the diameter inside the screw head accommodating part 3 (the diameter of the head accommodating part). Having such a shape makes it easier to insert the screw head 11 through the female screw part 5. Also, because the female screw part 5 exists, it becomes easier to insert a remover or an adjusting rod into this part to adjust or remove the dental abutment 1. Further, because the female screw part 5 exists, it can also be used for sealing after the upper structure is attached. The implant body (artificial tooth root), the abutment, and the screw head are screwed together, and thus they are precisely fixed. In this specification, that the valley diameter is larger than the diameter inside the screw head accommodating part 3 (the diameter of the head accommodating part) may be equivalent to the diameter of the screw head accommodating part, or may be 0.1 mm or more and 5 mm or less larger. Any diameter within the range that does not affect accommodating the screw head as described above is acceptable.

[0016] The relief groove part 7 exists above the female screw part and is an element having an internal hole with a diameter larger than the valley diameter of the female screw part. The relief groove part 7 may have a female screw formed inside, making the insertion and removal of the screw head 11 smoother and improving the working efficiency.

[0017] Figure 3 is a conceptual diagram showing how an abutment is removed using an abutment remover. The abutment remover 21 is used to remove a dental abutment 1. The abutment remover 21 includes a body portion 23 and a male threaded portion 25 provided on the body portion 23. The male threaded portion 25 has a screw shape corresponding to the female threaded portion 5. In the example in Figure 3, the abutment remover 21 has a head portion 27 at the top. As shown in Figure 3(a), when removing the abutment 1 with the abutment remover 21, the abutment remover 21 is inserted into the abutment 1 from top to bottom. After the male threaded portion 25 of the abutment remover 21 reaches the female threaded portion 5 (internal female thread) of the abutment 1, the abutment remover 21 can be rotated to connect (screw) the abutment remover 21 and the abutment 1. Figure 3(b) is a conceptual diagram showing the abutment remover and the abutment connected. In this state, by rotating the abutment remover 21, the female thread of the abutment engages with the male thread of the abutment remover. Then, by lifting the abutment remover 21, the abutment 1 can be removed.

[0018] Figure 4 is a conceptual diagram showing a state where an access hole blocking rod is inserted into a cavity inside an abutment. The access hole blocking rod 31 is used, for example, to block a dental abutment 1. The access hole blocking rod 31 has a male screw portion 35 having a shape corresponding to the female screw portion 5 (or the female screw of the relief groove portion 7). By passing the access hole blocking rod 31 through the cavity portion (access hole) inside the abutment 1, it is possible to prevent the inflow of resin, wax, cement, etc. during wax-up, cement bonding, and production of a verification index. The access hole blocking rod 31 may be composed of a resin used in dentistry. An example of the resin is a polyacetal resin. The access hole blocking rod 31 includes a body portion 33 having a shape that can enter the access hole and a male screw portion 35 provided on the body portion 33. The male screw portion 35 has a screw shape corresponding to the female screw portion 5. In the example of Fig. 4(a), a tip portion 37 is formed at the lower part of the male screw portion 35.

[0019] When using the access hole blocking rod 31, the access hole blocking rod 31 is inserted into the inside of the abutment 1 from the upper part toward the lower part. After the male screw portion 35 of the access hole blocking rod 31 reaches the female screw portion 5 (the internal female screw) of the abutment 1, the access hole blocking rod 31 can be rotated to couple (screw together) the access hole blocking rod 31 and the abutment 1. Fig. 4(b) is a conceptual diagram (cross-sectional view) showing a state where the access hole blocking rod and the abutment are coupled. Fig. 4(c) is a conceptual diagram showing a state where the access hole blocking rod is inserted into the abutment through a hole provided in the prosthesis. Fig. 4(d) is a conceptual diagram after adjusting the shape of the access hole blocking rod. In this example, after adhering the prosthesis to the abutment 1 in the oral cavity, the access hole blocking rod 31 is set, and the access hole blocking rod 3 is cut to an appropriate length and shaped. In this way, an implant can be formed using this abutment 1.

[0020] Figure 5 is a conceptual diagram showing an example of an abutment in which the female thread portion is provided around the screw head housing portion. Figure 5(a) shows an external view of the abutment. Figure 5(b) shows an example of a cross-sectional conceptual diagram of the abutment. Figure 5(c) shows the access hole sealing rod inserted into the abutment. In this example, the female thread portion 5 is provided around the screw head housing portion 3. As in this example, not the entire screw head 11 may be housed in the screw head housing portion 3, but only a part of it. In the example shown in Figure 5, the central axis of the internal cavity of the female thread portion 5 and the central axis of the internal cavity of the screw head housing portion 3 are the same or approximately the same. In the example in Figure 5, the female thread portion 5 is formed to surround the part in which a portion of the screw head 11 is housed. Also in this example, the access hole sealing rod 31 is screwed into the relief groove portion 7. [Examples]

[0021] Figure 6 is a conceptual diagram showing the designed abutment. Figure 6(a) is an external view, and Figure 6(b) is a partial cross-sectional view. This dental abutment 1 has a screw head housing portion 3, a female thread portion 5, and a relief groove portion 7. This abutment is a mechanism for separating the abutment from the implant fixture which is firmly fitted by a tapered joint. This abutment also serves as a hole sealing mechanism for fabricating a screw-fixed superstructure. This abutment has an internal thread on its inner surface. This is thicker than the screw head and is sized so as not to interfere with removal. A remover can be inserted here to remove the abutment from the fixture. This abutment can also be used for sealing after the superstructure has been attached.

[0022] Figure 7 is a conceptual diagram showing how to seal a prosthesis using an access hole sealing rod. Figure 7(a) shows the access hole sealing rod being inserted into the abutment. Figure 7(b) shows the access hole sealing rod protruding from the prosthesis after it has been inserted into the abutment. Figure 7(c) shows the access hole sealing rod being trimmed and then shaped.

[0023] Figure 8 is a photograph, replacing a diagram, showing a dental model manufactured with a 3D printer and an implant formed using an abutment. Figure 9 is a photograph, replacing a diagram, showing the dental model after the implant has been formed. Thus, it has been shown that using the dental abutment of this invention makes it easier to form implants and remove abutments. [Industrial applicability]

[0024] The dental abutment of the present invention is widely applicable in dental implant treatment and contributes to improving the efficiency and success rate of implant treatment. [Explanation of Symbols]

[0025] 1. Dental abutment 3. Screw head housing 5 Female thread section 7. Escape groove 11 Screw head 13 Torso 15 Head section 17 Threaded part 19 Tip 21 Abutment Remover 23 Torso 25 Male threaded section 27 Head section 31 Access hole sealing rod 33 Torso 35 Male threaded section 37 Tip

Claims

1. A screw head housing section for housing the screw head, A female threaded portion is provided around or above the screw head housing, and has a root diameter equal to or larger than the diameter of the hole inside the screw head housing. Dental abutment.

2. A dental abutment according to claim 1, A dental abutment having a hollow portion that penetrates the dental abutment via the screw head housing portion and the female thread portion.

3. A dental abutment according to claim 1, A dental abutment further having a relief groove portion with an internal hole having a diameter larger than the diameter of the groove of the female thread portion at the upper part of the female thread portion.

4. An abutment remover used for removing a dental abutment as described in claim 1, the abutment remover having a male thread portion having a shape corresponding to the female thread portion.

5. An access hole sealing rod used to seal a dental abutment as described in claim 1, the access hole sealing rod having a male thread portion having a shape corresponding to the female thread portion.

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