WO2020039651A1

WO2020039651A1 - Cover member

Info

Publication number: WO2020039651A1
Application number: PCT/JP2019/016681
Authority: WO
Inventors: 小林　健一郎; 薫櫻井
Original assignee: 小林　健一郎; 株式会社プラトンジャパン
Priority date: 2018-08-24
Filing date: 2019-04-18
Publication date: 2020-02-27
Also published as: JP2020028589A; JP6723300B2

Abstract

The present invention makes it possible to reliably and appropriately couple the jawbone of a patient to a fixture or the like. A cover screw 1 is a cover member that is to be attached to a hole which is provided in a fixture and serves as a fastening portion to which an abutment is connected in an implant treatment process. The cover screw 1 includes a pillar-like body 10 that is to be mated with the hole of the fixture on one end side, and a protruding portion 20 that is provided on a side surface of the body 10 circumferentially along the body. At least a portion of a surface of the protruding portion 20 facing the one end side and a portion 30 of the side surface of the body 10 that is continuous with the surface of the protruding portion 20 facing the one end side and is near the surface facing the one end side are mirrored.

Description

Cover material

{Circle over (1)} The present invention relates to a cover member attached to a hole provided in a fixture and serving as a fastening portion with an abutment in a process of implant treatment.

Conventionally, in dental treatment, implant treatment is known (for example, see Patent Document 1). In implant treatment, a fixture (implant body) is usually implanted (implanted) in an implant fossa formed in a patient's jaw bone. An abutment to which an artificial tooth is attached is fastened to the implanted fixture (for example, see Patent Document 1).

JP-A-7-328038

FIG. 4 shows a cross section of a conventional fixture F to be implanted in the jaw bone B of a patient. As shown in FIG. 4A, the conventional fixture F is implanted such that the upper surface thereof is approximately the same height as the surface of the jaw bone B. When the fixture F is thus implanted in the jaw bone B, as time passes, the surface portion of the jaw bone B in contact with the fixture F is absorbed and falls down as shown in FIG. It may be in a state. If the jaw bone B is absorbed, the area of the connection (osseointegration, osseointegration) between the fixture F and the jaw bone B decreases, and the fixture F may become unstable. In addition, if a part of the fixture having a rough surface structure is exposed, infection or peri-implantitis may be caused. The fixture F is desirably short (for example, about 4 mm) in consideration of invasion to the patient. However, considering the absorption of the jaw bone B, it has conventionally been difficult to use the short fixture F.

の一 One embodiment of the present invention has been made in view of the above, and has an object to provide a cover member that can securely and appropriately couple a patient's jaw bone and a fixture or the like.

In order to achieve the above object, a cover member according to an embodiment of the present invention is a cover member attached to a hole serving as a fastening portion with an abutment, provided on a fixture, in a process of implant treatment, A pillar-shaped main body fitted at one end to the hole of the fixture, and a projection provided on a side surface of the main body in a circumferential direction of the main body, and a surface facing the one end of the projection. At least a part of the side surface of the main body, which is continuous with the surface facing the one end of the overhang portion and is near the surface facing the one end, is mirror-finished.

カバー The cover member according to one embodiment of the present invention is used as follows. First, an implant fossa is formed in the patient's jawbone that is deeper than the length of the fixture. Subsequently, the fixture is implanted in the implant fossa. Subsequently, a cover member is attached to the fixture. At this time, a gap is formed between the protrusion of the cover member and the fixture. In addition, the cover member is inserted into the implant cavity so that the surface facing the one end side of the overhang portion of the cover member is not exposed from the implant cavity until the surface fits into the implant cavity. As a result, there is a space surrounded by the surface facing the one end side of the overhanging portion of the cover member, the side surface of the main body, and the fixture. Over time, the jawbone regenerates to fill this space. In other words, the regenerated jawbone is positioned up to the upper part of the fixture (opening side of the implant fossa) and is in a state of wrapping around the fixture. Thereafter, when the cover member is removed and the abutment is fastened to the fixture, the abutment and the jawbone of the space are joined. As a result, the patient's jaw bone can be securely connected to the fixture and the abutment.

On the other hand, the cover member is temporarily attached to the fixture until the abutment is attached in the course of implant treatment. Therefore, the cover member must be able to be reliably removed even after the jawbone has been regenerated. A portion of the side surface of the cover member forming the space, that is, a surface facing the one end side of the overhang portion, and a side surface of the main body portion following the surface facing the one end side of the overhang portion and facing the one end side. At least a part of the portion near the surface is mirror-finished. By performing the mirror finishing, it is possible to prevent the regenerated jaw bone from being bonded to the cover member. This allows the cover member to be reliably removed even after the jawbone has been regenerated. Therefore, according to the cover member according to the embodiment of the present invention, the jaw bone of the patient, the fixture and the abutment can be securely and appropriately connected.

The overhang portion may be a protrusion projecting to one end side, and may have a protrusion provided so as to surround the side surface of the main body portion and form an annular concave portion with the main body portion. According to this configuration, the surface area of the portion forming the space in the cover member can be increased, and as a result, the surface area of the jaw bone to be regenerated can be increased, and the connection between the jaw bone and the abutment can be further improved. Can be stronger.

According to the embodiment of the present invention, the jaw bone of the patient, the fixture and the abutment can be securely and appropriately connected.

It is sectional drawing of the cover screw which is a cover member which concerns on embodiment of this invention. FIG. 3 is a cross-sectional view of a cover screw, which is a cover member according to an embodiment of the present invention, attached to a fixture implanted in a patient's jawbone. FIG. 3 is a cross-sectional view of an abutment fastened to a fixture implanted in a patient's jawbone. It is a figure which shows the fixture state in the conventional jawbone of a fixture.

Hereinafter, embodiments of the cover member according to the present invention will be described in detail with reference to the drawings. In the description of the drawings, the same elements will be denoted by the same reference symbols, without redundant description. Also, the dimensional ratios in the drawings do not always match those described.

FIG. 1 shows a cover screw 1 which is a cover member according to the present embodiment. The cover screw 1 is a member that is attached to a hole provided in the fixture and blocks the hole in the course of implant treatment. The hole provided in the fixture is a hole serving as a fastening portion with the abutment. FIG. 1 is a cross-sectional view in a cross section passing through the axis of the cover screw 1. FIG. 2 shows a state in which the fixture F is implanted in the implant cavity 14 formed in the jaw bone B of the patient, and the cover screw 1 according to the present embodiment is attached to the fixture F. In the following description, the upper and lower sides are based on the states shown in FIGS.

カバー The cover screw 1 according to the present embodiment is used in a two-time method in which gingival incision and peeling operation is required twice. In the present embodiment, the two-time method is performed as follows. First, the implant F is formed in the jawbone of the patient by the first incision and peeling operation, and the fixture F is implanted.

The fixture F is a columnar (for example, columnar) member. The fixture F is provided with a hole F ′ serving as a fastening portion with the abutment from the end face to the inside. When the fixture F is implanted in the implant cavity 14, it is arranged in such a manner that the hole F 'can be seen from the opening of the implant cavity 14.

As the fixture F, the same as the conventional one can be used. Among the conventional fixtures, those having a shorter axial length or those having a shorter length (for example, about 4 mm) than the conventional fixture can be used. By using the short fixture F, invasion to the patient can be suppressed.

径 The diameter of the implant cavity 14 is slightly larger than the diameter of the fixture F so that the fixture F can be implanted. In addition, the depth of the implant cavity 14 in the present embodiment is made greater than the length of the fixture F in the axial direction. The depth of the implant cavity 14 is set to such a depth that a space formed by the fixture F and the cover screw 1 is located in the implant cavity 14 as described later. Specifically, for example, when the length of the fixture F in the axial direction is about 4 mm, the depth of the implant cavity 14 is about 5 mm.

After the fixture F is implanted in the implant cavity 14, the cover screw 1 is attached to the hole F 'of the fixture F. Thereafter, the cover screw 1 is completely covered with the gingiva G so as not to be exposed, and the healing of the jaw bone B is awaited in this state. By attaching the cover screw 1 to the hole F 'of the fixture F, it is possible to prevent the regenerated jaw bone B and gingiva G from entering the hole F' of the fixture F when the jaw bone B is healed. When the jaw bone B has healed, a second incision and peeling operation is performed, the cover screw 1 is removed from the hole F ′ of the fixture F, and the abutment is fastened.

Next, the configuration of the cover screw 1 will be described. As shown in FIG. 1, the cover screw 1 includes a column-shaped main body 10 and a projection 20 provided on a side surface of the main body in a circumferential direction of the main body.

The main body 10 is fitted into the hole F 'of the fixture F at one end. The main body 10 has a substantially columnar shape. The main body 10 includes a base portion 11 on the side fitted with the fixture F, and a head portion 12 on the side exposed from the hole F ′ when the cover screw 1 is fitted into the hole F ′ of the fixture F. And divided into Note that the base 11 and the head 12 are defined for convenience of description, and the boundary between the base 11 and the head 12 may vary depending on the fixture F used, the state of attachment of the cover F to the fixture F, and the like.

径 The diameter of the base portion 11 is made slightly smaller than the diameter of the hole F 'of the fixture F so as to fit into the hole F' of the fixture F. The base portion 11 is provided with a groove for fitting with the fixture F. Note that a groove for fitting with the cover screw 1 and the abutment is also provided in the hole F 'of the fixture F at a position corresponding to the groove of the base 11 (not shown).

径 The diameter of the one end 12a on the base 11 side of the head 12 is substantially the same as the diameter of the boundary between the base 11 and the head 12 or the diameter of the hole F 'of the fixture F. The head 12 is provided with a hole 12c, and the opening of the hole 12c is located on the end face 12b of the other end of the head 12 where the overhang 20 is provided. The hole 12c is for inserting an instrument when the cover screw 1 is attached to or detached from the fixture F.

The overhang portion 20 has a shape that expands in a circular shape from the head portion 12 of the main body portion 10. That is, the shape of the projecting portion 20 when viewed from the direction of the axis 10a of the main body 10 is circular. Note that the axis 10 a of the main body 10 corresponds to the axis of the cover screw 1. The overhang portion 20 has, for example, an outer diameter approximately the same as the outer diameter of the fixture F (specifically, approximately 4 to 5 mm in diameter). It has a thickness (length in the direction of the axis 10a) of about several mm (specifically, about 0.7 mm). The overhang portion 20 is provided along the end surface 12b of the other end of the head 12 in the direction of the axis 10a. As shown in FIG. 2, the cover screw 1 is arranged such that the surface of the overhang portion 20 on the base portion 11 side is not exposed from the opening of the implant cavity 14. That is, the depth of the implant cavity 14 is set to a depth at which the surface of the projecting portion 20 on the base portion 11 side can be located in the implant cavity 14. In addition, the end surface 12b of the head 12 and the upper end surface 20b of the overhanging portion 20 are separated from the bone edge, which is the surface of the jaw bone B, by, for example, 0.1 mm in the example of FIG. It is made to come out about several mm. The upper end surfaces 12b and 20b of the head 12 and the overhanging portion 20 come into contact with the gingiva G when covered with the gingiva G.

The overhang portion 20 has a projection 20a protruding toward the side to be fitted with the fixture F, that is, toward the base portion 11 side. The protrusion 20 a is provided on an outer edge portion of the overhang 20. The protrusion 20 a has an annular (ring donut) shape surrounding the side surface of the head 12 of the main body 10, and the tip of the protrusion 20 a is separated from the head 12 of the main body 10. Thereby, a concave portion 21 which is an annular concave (dent) is formed between the convex portion 20a and the head portion 12 of the main body portion 10. The thickness of the protruding portion 20a of the protruding portion 20, that is, the length in the direction of the axis 10a is equal to 0. It is about several mm (specifically, about 0.2 mm). Therefore, the depth of the concave portion 21 has the same value.

境 The boundary between the head 12 and the base 11 and the tip of the projection 20a of the overhang 20 have a constant length L1 in the direction of the axis 10a. Thereby, as shown in FIG. 2, when the cover screw 1 is attached to the fixture F, a gap is formed between the upper end surface of the fixture F and the protrusion 20 a of the overhang 20. The length L1 is, for example, 0. It is about several mm (specifically, about 0.5 mm).

The cover screw 1 may be configured to have a gap corresponding to the length L1 described above with respect to the fixture F. For example, in the hole F 'of the fixture F, the length in the direction of the axis 10a from the surface where the end face of the base portion 11 abuts when the cover screw 1 is fitted to the upper surface of the fixture F, that is, the opening surface of the hole F'. The length L3 in the direction of the axis 10a from the end face of the base 11 of the cover screw 1 to the tip of the projection 20a is set to be longer than L2. However, such a configuration is not necessarily required, and when the cover screw 1 is fitted to the fixture F, the above-mentioned gap may be formed by adjusting the degree of fastening (screw-in).

When the cover screw 1 is attached to the fixture F, the annular space S sandwiched between the surface on the base portion 11 side of the projecting portion 20 of the cover screw 1 and the upper surface of the fixture F is formed due to the above gap. it can. The jaw bone B is regenerated so as to fill the space S inside the implant cavity 14.

By the way, when the jaw bone B regenerated in the space S and the cover screw 1 are combined, the cover screw 1 becomes difficult to remove from the fixture F. Therefore, a predetermined portion 30 of the cover screw 1 forming the space S is mirror-finished so that the cover screw 1 can be easily removed from the fixture F. Here, the predetermined portion 30 is a surface of the overhanging portion 20 on the base portion 11 side, that is, a portion forming the annular concave portion 21, and a side surface of the head 12. The side surface of the head 12 is, in other words, a portion of the side surface of the main body 10 that follows the surface of the overhanging portion 20 on the base portion 11 side and is near the surface on the base portion 11 side. The portion 30 is a portion exposed from the fixture F, and is a portion that can come into contact with the regenerated jaw bone B after the cover screw 1 is mounted in the oral cavity of the patient.

The mirror finishing is performed, for example, by a conventionally known method. Note that the portion to be mirror-finished is not necessarily the entire portion 30 described above, and may be at least a part of the portion 30.

先端 As shown in FIGS. 1 and 2, the tip of the projection 20a may be chamfered. As shown in FIGS. 1 and 2, the outer side surface of the overhang portion 20 including the protrusion 20a may have a slightly smaller diameter as it goes downward. However, the side surface may have a larger diameter as it goes downward, or may have a constant diameter. A portion between the tip and the root of the protrusion 20a, that is, the outer and inner side surfaces of the protrusion 20a may be formed by a concave surface. However, the side surface may be configured as a flat surface or a raised surface. The shape of the jawbone to be regenerated when the cover screw 1 is attached to the fixture F is in accordance with the shape of the projection 20a. By making the shape of the convex portion 20a as described above, the jaw bone B and the abutment are strongly coupled to each other when the cover screw 1 is removed and the abutment is fastened to the fixture F. it can.

The main body 10 and the overhang 20 may be formed integrally. The main body 10 and the overhang 20 may be made of, for example, titanium, similarly to a conventional cover screw. Alternatively, the head portion 12 and the overhang portion 20 of the main body portion 10 that are in contact with the patient's gingiva G are made of zirconia ceramic having little influence on the patient's gingiva G, and the base portion 11 of the main body portion 10 fitted with the fixture F is provided. May be made of titanium. The above is the configuration of the cover screw 1 according to the present embodiment.

According to this embodiment, the regenerated jaw bone B enters the space S between the cover screw 1 and the fixture F as described above. In other words, the regenerated jaw bone B is positioned above the fixture F (on the side of the opening of the implant cavity 14) and is in a state of wrapping around the fixture F. Thereafter, as shown in FIG. 3, when the cover screw 1 is removed and the abutment A is fastened to the fixture F, the abutment A and the jaw bone B of the space S are eventually combined. The shape of the portion of the abutment A to be embedded in the jaw bone B used at this time may be a shape (for example, the same shape) corresponding to the shape of the cover screw 1 described above. Thereby, the jaw bone B of the patient, the fixture F, and the abutment A can be securely connected.

On the other hand, a portion corresponding to the space S of the cover screw 1 is mirror-finished. By performing the mirror finishing, it is possible to prevent the regenerated jaw bone B from being coupled to the cover screw 1. Thereby, even after the jaw bone B has been regenerated, the cover screw 1 can be reliably removed. Therefore, according to the present embodiment, the jaw bone B of the patient, the fixture F, and the abutment A can be securely and appropriately connected.

According to the present embodiment, it is possible to prevent the jaw bone B from being absorbed near the side surface of the fixture F as shown in FIG. As a result, the short fixture F can be used as described above, and invasion to the patient can be suppressed.

凸 Also, as in the present embodiment, the projecting portion 20a may be provided on the projecting portion 20 of the cover screw 1. According to this configuration, the surface area of the portion forming the space S of the cover screw 1 can be increased, and as a result, the surface area of the regenerated jaw bone B can be increased. The bond can be stronger. However, the convex portion 20a is not necessarily provided, and the surface of the overhanging portion 20 on the base portion 11 side may be flat.

In the present embodiment, the cover member according to the present invention is the cover screw 1. However, the cover member is not necessarily a cover screw, and may be any member that can be attached to a hole provided in the fixture. For example, the cover member according to the present invention may be a cover cap, a healing screw, or the like.

1: cover screw, 10: body, 11: base, 12: head, 20: overhang, 20a: projection.

Claims

In the course of implant treatment, a cover member attached to a hole provided in the fixture and serving as a fastening portion with the abutment,
A column-shaped main body fitted into the fixture hole at one end side,
An overhang provided on a side surface of the main body in a circumferential direction of the main body,
At least a part of a surface facing the one end side of the overhang portion, and a portion of the side surface of the main body portion, which follows the surface facing the one end side of the overhang portion and is near the surface facing the one end side. A mirror-finished cover member.
2. The projection according to claim 1, wherein the overhanging portion is a protrusion protruding toward the one end side, and has a protrusion surrounding the side surface of the main body and forming an annular concave portion with the main body. 3. A cover member as described in the above.