Implant structure having fixture with long neck portion and cover screw for initial fixation

Abstract

The present invention relates to an implant structure having a cover screw for initial fixation and a fixture with a long neck portion capable of securing long-term osseointegration of an implant even after functional loading is applied in cases where bone quality is poor or bone volume is low or insufficient, extensive bone grafting is required, or bone grafting with maxillary sinus lift surgery is performed. The present invention comprises: a fixture (100) implanted in the jawbone to serve as a tooth root; a cover screw (400) inserted into and fixed to the fixture (100) to secure a fixation force of the fixture (100); an abutment (200) which has a lower portion inserted into the fixture (100) from which the cover screw (400) has been separated and removed and which has an upper portion to which a crown (10) is coupled; a fixation screw (300) which fixes the abutment (200) to the fixture (100); and a screw cap (500) coupled to the abutment (200) to cover the fixation screw (300).

Description

Implant structure having a fixture for forming a long neck and a cover screw for initial fixation

[0001] The present invention relates to an implant structure having a fixture and an initial fixation cover screw having a long neck portion formed therein, which can secure long-term implant osseointegration even after functional load is applied, in cases where bone quality is weak or bone quantity is thin or insufficient, where a large amount of bone grafting is required, or where bone grafting accompanied by maxillary sinus lift surgery is performed.

[0002] In general, a dental implant is a method of creating a new artificial tooth by implanting a fixture with a structure similar to a tooth root into the jawbone where the root of the lost tooth was. Unlike fixed dentures, it does not require the removal of adjacent teeth, so there is no damage to adjacent teeth and there is no risk of secondary caries, making it a more stable method than fixed dentures.

[0003] The implant includes a fixture that is fixed to the alveolar bone, an abutment that is connected to the upper part of the fixture, and a fastening screw that fixes the abutment to the fixture.

[0004] Typically, implant surgery involves a primary procedure, where a fixture is implanted into the jawbone. This is followed by a lengthy wait of approximately three to six months before the final prosthesis is secured. The fixture, which is the substructure of the implant, typically has a screw-like shape and can be categorized into various types based on its placement (height) relative to the jawbone. Regardless of the patient's oral anatomy, the fixture can be manufactured to a predetermined shape and implanted into the jawbone.

[0005] These implants can be placed in the mandible or the maxilla.

[0006] And when the implant is placed in the maxilla, the bone height is low, so bone grafting can be performed before the implant is placed.

[0007] However, even with bone grafting, the fixture's stable fixation to relatively low bone is limited, and it takes a considerable amount of time for the grafted bone to stabilize, making it difficult to obtain initial fixation of the submerged type implant, increasing the likelihood of bone fusion failure.

[0008] The background technology of the present invention is patent registration number 10-2076201 (February 5, 2020), “Implant fixture-abutment combination”, which is published in the Korean Intellectual Property Office.

[0009] The purpose of the present invention is to provide an implant structure having a fixture and an initial fixation cover screw that can secure long-term implant osseointegration even after functional load is applied in cases where bone quality is weak or bone quantity is thin or insufficient, where a large amount of bone grafting is required, or where bone grafting accompanied by maxillary sinus lift is performed.

[0010] An implant structure having a fixture in which a long neck portion is formed and a cover screw for initial fixation according to an embodiment of the present invention comprises a fixture (100) that is implanted into a jawbone and functions as a tooth root, a cover screw (400) that is inserted and fixed into the fixture (100) to secure fixing force of the fixture (100), an abutment (200) whose lower part is inserted into the fixture (100) from which the cover screw (400) is separated and removed and a crown (10) is coupled to the upper part, a fixing screw (300) that fixes the abutment (200) to the fixture (100), and a screw cap (500) that is coupled to the abutment (200) and covers the fixing screw (300), and the fixture (100) has an implantation screw thread (110) formed at the lower part for implantation into the alveolar bone and a long neck portion (150) having a smooth outer surface. It is characterized in that an insertion hole (120) formed at the upper part and into which an abutment (200) is inserted is formed at the upper part of a long neck portion (150), and an internal screw thread (140) to which a fixing screw (300) is coupled is formed at the lower part of the insertion hole (120).

[0011] Preferably, the long neck (150) is formed with a length of 1 mm to 15 mm and is characterized by a taper (T) that gradually narrows toward the top.

[0012] Preferably, the cover screw (400) is characterized by including a cover body (410) inserted into an insertion hole (120) of a fixture (100), a cover screw thread (420) formed at the lower portion of the cover body (410) and coupled to an internal screw thread (140) of the fixture (100), a cover plate (430) formed at the upper portion of the cover body (410) and covering the upper portion of the fixture (100), a long neck cover (440) formed to be bent downward from the outer side of the cover plate (430) and to surround a long neck (150) of the fixture (100) and to be coupled to the alveolar bone, and a wrench hole (450) formed at the center of the cover plate (430) and to which a wrench is connected.

[0013] Preferably, the long neck cover (440) is characterized in that a screw thread (442) that is coupled to the alveolar bone is formed on the outer surface, and an inclined surface (441) is formed on the screw thread (442) whose outer diameter gradually narrows toward the bottom.

[0014] Preferably, the abutment (200) is characterized in that a plurality of support pieces (210) coupled to a screw cap (500) are formed to be spaced apart from the top and outward at regular intervals, a locking projection (220) protruding outward from the support piece (210) is formed, a through hole (230) through which a fixing screw (300) passes is formed to penetrate upward and downward, a neck insertion portion (240) into which a long neck portion (150) of a fixture (100) is inserted is formed to be in communication with the lower portion of the through hole (210), and the screw cap (500) is characterized in that a support groove (510) into which the support pieces (210) are inserted and supported is opened downward, and a locking groove (520) is formed on the inner circumferential surface of the support groove (510).

[0015] Preferably, the support groove (510) of the screw cap (500) is formed by an inner vertical surface (511) that is formed vertically upward from the locking groove (520), and an inner inclined surface (512) that is formed to gradually expand downward from the lower portion of the locking groove (520), and the support piece (210) of the abutment (200) is characterized in that the surface contacts the inner vertical surface (511) of the support groove (510), and the outer inclined surface (201) of the abutment (200) that is formed to gradually narrow upward from the locking projection (220) is characterized in that the surface contacts the inner inclined surface (512) of the support groove (510).

[0016] Preferably, the locking protrusion (220) is characterized by having a cross-sectional shape formed in a triangular or semicircular shape.

[0017] Preferably, insertion protrusions (530) are formed to be distributed between the support pieces (210) to expand the spacing between the support pieces (210) in the support groove (510) of the screw cap (500), and the insertion protrusions (530) are characterized in that the width (d4) of the lower portion is formed narrower than the width (d3) of the upper portion.

[0018] Preferably, the screw cap (500) is characterized in that an expansion projection (540) is formed in the center of the upper portion of the support groove (510) to expand the gap between the support pieces (210) by being inserted between the support pieces (210), and the expansion projection (540) is formed in an inverted cone shape.

[0019] The present invention can secure long-term implant osseointegration even after functional load is applied in cases where bone quality is weak or bone quantity is thin or insufficient, where a large amount of bone grafting is required, or where bone grafting accompanied by maxillary sinus augmentation is performed.

[0020] More specifically, the long neck formed on the upper part of the fixture has a smooth outer surface and a tapered shape that gradually narrows toward the upper part, which helps in the initial fixation of the cover screw to the long neck.

[0021] In addition, by combining a cover screw with a fixture implanted in the alveolar bone, foreign substances can be prevented from being introduced into the fixture's insertion hole, and the fixture can be firmly fixed to the alveolar bone after a certain period of time.

[0022] Additionally, a screw cap is attached to the abutment to prevent foreign substances from entering the internal space of the abutment.

[0023] Additionally, the process of attaching the screw cap to the abutment can be done easily and quickly in a one-touch format.

[0024] FIG. 1 is a cross-sectional view showing a fixture applied to one embodiment of the present invention.

[0025] Figure 2 is a cross-sectional view showing long necks of various lengths formed in the fixture.

[0026] Fig. 3 is a perspective view showing a cover screw of the present invention.

[0027] Figure 4 is a cross-sectional view showing the configuration of Figure 3.

[0028] Fig. 5 is a cross-sectional view showing a state in which a cover screw is coupled to a fixture of the present invention.

[0029] Fig. 6 is a cross-sectional view showing a state in which the fixture of the present invention is implanted in a narrow alveolar bone.

[0030] Fig. 7 is a cross-sectional view showing a state in which the fixture of the present invention is implanted in a wide alveolar bone.

[0031] Fig. 8 is a perspective view showing an abutment and screw cap applied to the present invention.

[0032] Fig. 9 is a cross-sectional view of Fig. 8.

[0033] Fig. 10 is a cross-sectional view showing the combined state of Fig. 9.

[0034] Fig. 11 is a perspective view showing another embodiment of an abutment and screw cap applied to the present invention.

[0035] Fig. 12 is a cross-sectional view of Fig. 11.

[0036] Fig. 13 is a cross-sectional view showing the combined state of Fig. 12.

[0037] Fig. 14 is a perspective view showing another embodiment of an abutment and screw cap applied to the present invention.

[0038] Fig. 15 is a cross-sectional view of Fig. 14.

[0039] Fig. 16 is a cross-sectional view showing the combined state of Fig. 15.

[0040] Fig. 17 is a perspective view showing an abutment according to another embodiment applied to the present invention.

[0041] Fig. 18 is a cross-sectional view showing the abutment and fixture of Fig. 17.

[0042] Hereinafter, the present invention will be described in detail with reference to the attached drawings.

[0043] As illustrated, an implant structure having a fixture in which a long neck portion is formed and a cover screw for initial fixation according to an embodiment of the present invention includes a fixture (100) that is implanted into a jawbone and functions as a tooth root, a cover screw (400) that is inserted and fixed into the fixture (100) to secure fixing force of the fixture (100), an abutment (200) whose lower part is inserted into the fixture (100) from which the cover screw (400) has been separated and removed, and a crown (10) is coupled to the upper part, a fixing screw (300) that fixes the abutment (200) to the fixture (100), and a screw cap (500) that is coupled to the abutment (200) and covers the fixing screw (300).

[0044] As illustrated in FIGS. 1, 2, and 5, the fixture (100) corresponds to the root of a tooth, and is formed with a metal such as titanium, and has a screw thread (110) formed at the bottom for implantation into the alveolar bone, and a long neck portion (150) with a smooth outer surface formed at the top. The screw thread (110) is surface-treated to facilitate osseointegration after implantation in the alveolar bone. The long neck portion (150) is made of titanium or a titanium alloy, and is surface-polished by mechanical polishing, electrolytic polishing, chemical polishing, etc. to form a smooth state. This smoothness prevents tartar from accumulating, and as tartar does not accumulate, bacterial growth is difficult. In addition, the long neck portion (150) has a taper (T) that gradually narrows toward the top. It is preferable that the taper (T) narrows at an angle of 0.5 to 3 degrees toward the top. Accordingly, since a taper (T) is formed in the long neck portion (150), it can be easily inserted into the neck insertion portion (240) of the abutment (200), and after being inserted, the fixed state can be firmly maintained by frictional force.

[0045] It is preferable that the implant screw thread (110) be formed to be 4 to 14 mm, and the long neck portion (150) be formed to be 1 to 18 mm. The long neck portion (150) can be formed to be smaller or larger than the implant screw thread (110), so that it can be used appropriately depending on the width of the alveolar bone.

[0046] A long neck portion (150) formed smoothly with a reverse slope by this taper (T) can be manufactured in various lengths and used as a submerged type. The long neck portion (150) can be easily inserted into an abutment or crown (10) and fixed by frictional force by the taper (T) formed on the long neck portion (150).

[0047] In some cases, the long neck (150) can be formed long so that the implant screw thread (110) can be implanted deep enough to not be exposed to the outer end of the bone when implanting in a bone with different three-dimensional heights, thereby minimizing bone grafting.

[0048] Alternatively, the long neck portion (150) formed long can be exposed above the tissue (cell tissue) to use the long neck portion (150) as an abutment, so that it can be used as a convertible implant in the form of a one-body implant.

[0049] Additionally, the long neck (150) can be formed to have a low height (d1) or a high height (d2) to correspond to the height of the alveolar bone. This allows the implantation depth of the fixture (100) to be adjusted.

[0050] And the fixture (100) has an insertion hole (120) into which a fixing screw (300) is inserted formed at the upper part of the long neck (150), and an internal screw thread (140) to which the fixing screw (300) is coupled is formed at the lower part of the insertion hole (120). The insertion hole (120) is formed in a funnel shape with a diameter that gradually narrows toward the bottom.

[0051] After implanting and fixing the fixture (100) into the alveolar bone, it takes a certain period of time, approximately 3 to 4 months, for the bone bonding of the fixture (100) to be completed.

[0052] Here, when a general abutment (not shown) is combined with a fixture (100) and a functional load is repeatedly applied after bone fusion is completed, when the abutment is separated from the fixture (100), tartar accumulates on the implant screw thread (110) exposed in the space between the separations, causing bone loss. In addition, infection caused by tartar occurs in the implant screw thread (110) area of ​​the fixture (100), accelerating bone loss and causing peri-implantitis.

[0053] However, in the present invention, since the long neck portion (150) of the fixture (100) is formed smoothly, tartar does not accumulate, preventing infection from occurring. Since the long neck portion (150) of the fixture (100) is long, the implant screw thread (110) is not easily exposed to the outside, allowing osseointegration to be easily formed. In addition, since the implant screw thread (110) area is not directly affected by tartar, etc., bone loss can be prevented.

[0054] As illustrated in Fig. 6, if the width of the alveolar bone is wide enough, the fixture (100) is not implanted deeply, but only to an appropriate length, so that only the long neck (150) is exposed to the upper part of the alveolar bone, and the implant screw thread (110) is not exposed to the outside of the alveolar bone. Here, since the implant screw thread (110) is not exposed to the outside of the alveolar bone, tartar does not accumulate on the implant screw thread (110). Of course, when a fixture (100) with this structure is implanted, the remaining alveolar bone around the implant screw thread (110) is wide and strong, so that the implanted state of the fixture (100) can be firmly maintained even if the fixture (100) is not implanted deeply. At this time, since the long neck portion (150) of the fixture (100) protrudes high above the alveolar bone, the crown (10) can be directly fixed to the long neck portion (150) without using an abutment to correct the height with adjacent teeth. In other words, the long neck portion (150) of the fixture (100) itself is used as an abutment. In addition, by combining a plug (30) with the insertion hole (120) of the fixture (100), the structure can be strengthened while preventing foreign substances from penetrating the insertion hole (120).

[0055] As shown in Fig. 7, when the width of the alveolar bone is narrow and insufficient, the fixture (100) is deeply implanted so that the implant screw thread (110) is deeply implanted into the lower part of the alveolar bone. Therefore, when the alveolar bone is thin, even if bone loss gradually occurs from the upper part of the alveolar bone, the implant screw thread (110) is deeply implanted into the lower part of the alveolar bone with a wide width, so that the implant screw thread (110) is not easily exposed to the outside. At this time, as the fixture (100) is deeply implanted, in order to correct the height with the adjacent teeth, the abutment (200) is fixed to the fixture (100) with a fixing screw (300), and then the crown (10) is fixed to the abutment (200).

[0056] As illustrated in FIGS. 3 to 5, the cover screw (400) includes a cover body (410) inserted into an insertion hole (120) of a fixture (100), a cover screw thread (420) formed at the lower portion of the cover body (410) and coupled to an internal screw thread (140) of the fixture (100), a cover plate (430) formed at the upper portion of the cover body (410) and covering the upper portion of the fixture (100), a long neck cover (440) formed to be bent downward from the outer side of the cover plate (430) and to surround a long neck (150) of the fixture (100) and to be coupled to the alveolar bone, and a wrench hole (450) formed at the center of the cover plate (430) and to which a wrench is connected.

[0057] The cover body (410) is formed in an inverted cone shape with a diameter that gradually decreases toward the bottom. That is, the cover body (410) can be inserted into and fixed in the insertion hole (120) of the fixture (100). At this time, when the inverted cone-shaped cover body (410) is inserted into the funnel-shaped insertion hole (120), frictional force increases, thereby increasing the fixing force.

[0058] When the cover screw thread (420) is coupled to the internal screw thread (140) of the fixture (100), the state in which the cover plate (430) covers the upper part of the fixture (100) can be firmly maintained.

[0059] When the cover plate (430) covers the upper part of the fixture (100), foreign substances can be prevented from entering the insertion hole (120) of the fixture (100).

[0060] The long neck cover (440) may have screw threads (442) formed on the outer surface thereof to be joined to the alveolar bone. The state of being joined to the alveolar bone may be firmly maintained by these screw threads (442).

[0061] The long neck cover (440) has a tapered surface (441) whose outer diameter gradually narrows toward the bottom from the screw thread (442), so that it can be easily separated from the alveolar bone while being connected thereto. At this time, since the long neck cover (440) is easily separated from the alveolar bone, the fixture (100) can be continuously maintained in a state of being fixed to the alveolar bone without shaking. In addition, screw threads may be formed on the tapered surface (441).

[0062] Additionally, the long neck cover (440) can be easily coupled to the long neck part (150) by the taper (T) formed on the long neck part (150).

[0063] The wrench hole (450) is formed in a hexagonal shape so that a hex wrench can be inserted. Therefore, when the hex wrench is inserted into the wrench hole (450) and rotated, the cover plate (430) rotates.

[0064] Therefore, when the hex wrench is rotated while inserted into the wrench hole (450), the cover screw thread (420) is engaged with the internal screw thread (140) of the fixture (100), and the cover body (410) is fixed by coming into contact with the insertion hole (120) of the fixture (100). At this time, the state in which the cover plate (430) closes the insertion hole (120) of the fixture (100) is firmly maintained.

[0065] Of course, if the hex wrench is rotated in the opposite direction, the inclined surface (441) of the long neck cover (440) can be easily separated from the alveolar bone.

[0066] In this way, when the fixture (100) is implanted into the alveolar bone with the cover screw (400) attached and bone fusion is achieved, the fixture (100) can be firmly maintained in a fixed state without being separated from the alveolar bone during the process of separating the cover screw (400) from the fixture (100).

[0067] Here, the implant screw (110) of the fixture (100) is deeply implanted into the alveolar bone, and the cover screw (400) is pressed and joined while surrounding the long neck (150) of the fixture (100) or joined by screw tightening, so that it can be inserted into the bone of the cortical layer in the alveolar bone to secure initial fixation.

[0068] In addition, since the cover screw (400) is not surface treated, the cover screw (400) can be easily separated from the fixture (100) after bone adhesion of the fixture (100) is secured.

[0069] And as the cover screw (400) is separated, the insertion hole (120) of the fixture (100) is opened, so that a plug (20) can be combined or a fixing screw (300) can be inserted into the insertion hole (120) of the fixture (100).

[0070] By attaching a cover screw (400) to a fixture (100) implanted in the alveolar bone in this manner, foreign substances can be prevented from entering the insertion hole (120) of the fixture (100). If a certain period of time passes in this state, the fixture (100) can be firmly fixed to the alveolar bone.

[0071] As shown in FIGS. 8 to 10, the abutment (200) is formed so that a plurality of support pieces (210) coupled to the screw cap (500) are spaced apart from each other at regular intervals while being distributed from the top to the outside, a locking projection (220) protruding outward from the support piece (210) is formed, a through hole (230) through which a fixing screw (300) passes is formed so as to pass through vertically, and a neck insertion portion (240) into which a long neck portion (150) of a fixture (100) is inserted is formed so as to be connected to the lower portion of the through hole (210).

[0072] The support piece (210) is formed as a convex curved surface on the outer surface and is inserted into the support groove (510) of the screw cap (500) described later and is supported on the upper inner surface of the support groove (510). In other words, the support area is increased and the support force can be increased.

[0073] These support pieces (210) are formed to be dispersed in all directions. A gap is formed between the support pieces (210), and when the support pieces (210) are inserted into the screw cap (500) and external pressure is applied in all directions, the support pieces (210) come closer to each other. Of course, when the pressure is released, the support pieces (210) move away from each other and are restored to their original state.

[0074] The locking protrusion (220) is formed in a triangular or semicircular cross-section. In addition, since the locking protrusion (220) is formed on each of the support pieces (210), the bonding strength can be increased.

[0075] A screw thread through which a fixing screw (300) passes can be formed in the through hole (230).

[0076] Since the neck insertion part (240) is formed to be connected to the lower part of the through hole (210), the long neck part (150) of the fixture (100) is inserted and fixed. Accordingly, since the long neck part (150) of the fixture (100) is inserted into the neck insertion part (240) of the abutment (200), the outer surface of the long neck part (150) is supported by the inner surface of the neck insertion part (240).

[0077] The screw cap (500) has a support groove (510) that is opened downwards and supported by inserting support pieces (210), and a locking groove (520) is formed on the inner surface of the support groove (510).

[0078] The support groove (510) of the screw cap (500) is formed by an internal vertical surface (511) that is formed vertically upward from the locking groove (520), and an internal inclined surface (512) that is formed to gradually expand downward from the lower portion of the locking groove (520).

[0079] The support piece (210) of the abutment (200) is in surface contact with the inner vertical surface (511) of the support groove (510). In addition, the outer inclined surface (201) of the abutment (200), which is formed to gradually narrow upward from the locking protrusion (220), is in surface contact with the inner inclined surface (512) of the support groove (510).

[0080] Accordingly, when the support pieces (210) are inserted into the support groove (510) of the screw cap (500), the locking protrusions (220) are inserted into the locking groove (520) of the screw cap (500) and are fastened. That is, when the support pieces (210) are inserted into the support groove (510) of the screw cap (500), the locking protrusions (220) are coupled to the locking groove (520). At this time, the state in which the locking protrusions (220) are coupled to the locking groove (520) can be firmly maintained by the elasticity of the support pieces (210). At this time, the support pieces (210) are supported on the inner vertical surface (511) of the support groove (510), and at the same time, the outer inclined surface (201) of the abutment (200) is supported on the inner inclined surface (512) of the support groove (510). In this way, the process of attaching the screw cap (500) to the abutment (200) can be easily and quickly performed in a one-touch format.

[0081] Additionally, the abutment (200) can be bonded to the screw cap (500) and the crown (10) using an adhesive such as cement. That is, the crown (10) bonded to the screw cap (500) can be fixed to the abutment (200).

[0082] As illustrated in FIGS. 11 to 13, a protrusion (250) is formed in the through hole (230) of the abutment (200) so as to protrude into the neck insertion portion (240) and be inserted and fixed into the insertion hole (120) of the fixture (100). The protrusion (250) is formed in an inverted cone shape and is supported on the inner surface of the insertion hole (120) and fixed by frictional force. A screw thread is formed in the protrusion (250) through which a fixing screw (300) passes from the through hole (230) to the neck insertion portion (240).

[0083] Insertion protrusions (530) are formed to be distributed between the support pieces (210) to expand the spacing between the support pieces (210) in the support groove (510) of the screw cap (500). The insertion protrusions (530) are formed above the locking groove (520) in the support groove (510). Therefore, when the screw cap (500) is lowered from the upper part to the lower part of the abutment (200), the insertion protrusions (530) are inserted between the support pieces (210). In other words, the support pieces (210) are spread out to both sides.

[0084] As shown in the enlarged view on the upper left in Fig. 11, the insertion protrusion (530) is formed so that the width (d4) of the lower portion is narrower than the width (d3) of the upper portion. The width (d3) of the upper portion of the insertion protrusion (530) may be formed to be slightly larger than the width between the support pieces (210).

[0085] Accordingly, since the insertion projections (530) are forcibly inserted between the support pieces (210) from the bottom to the top, the gap between the support pieces (210) is expanded, and as the support pieces (210) move away from each other, they are supported by a strong frictional force on the inner surface of the support groove (510). Of course, since the support pieces (210) are spread out in the front, back, left, and right directions, the state in which the locking projections (220) are inserted into the locking groove (520) can be firmly maintained.

[0086] As shown in FIGS. 14 to 16, a screw cap (500) is inserted between the support pieces (210) so that an expansion protrusion (540) that expands the spacing between the support pieces (210) is formed at the center of the upper portion of the support groove (510). The expansion protrusion (540) is formed in an inverted cone shape and has a shape of an upper and lower jaw.

[0087] Accordingly, when the screw cap (500) is lowered from the top to the bottom of the abutment (200), the expansion protrusion (540) formed in the upper center of the support groove (510) of the screw cap (500) is inserted between the support pieces (210). In other words, the support pieces (210) are spread out in the front, back, left, and right directions.

[0088] As illustrated in FIGS. 17 and 18, the abutment (200) is formed with grooves (202) dispersed at the bottom. These grooves (202) may be formed in numbers of 2 to 8 and spaced apart at regular intervals.

[0089] Accordingly, in the process of inserting the long neck part (150) of the fixture (100) into the neck insertion part (240) of the abutment (200), the grooves (202) are elastically spread apart, so that not only can the long neck part (150) be inserted into the neck insertion part (240) to an exact length, but also the state in which the long neck part (150) is inserted and fixed into the neck insertion part (240) can be firmly maintained by the elastic force formed by the grooves (202).

[0090] In this way, according to the present invention, by combining a cover screw (400) with a fixture (100) implanted in the alveolar bone, the fixture (100) can be easily fixed to the alveolar bone while preventing contamination of the insertion hole (120) in the fixture (100). In addition, after separating the cover screw (400) from the fixture (100), an abutment (200) can be combined with the fixture (100), and then a crown (10) can be combined with the abutment (200) to complete the implant.

[0091] In this way, according to the present invention, in cases where the bone quality is weak or the bone quantity is thin or insufficient, in cases where a large amount of bone grafting is required, or in cases where bone grafting is performed in conjunction with maxillary sinus augmentation, long-term implant osseointegration can be secured even after functional load is applied, so it can be said to be a very useful invention.

[0092] Those skilled in the art will appreciate that the present invention can be implemented in other specific forms without altering its technical spirit or essential characteristics. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. The scope of the present invention is indicated by the claims that follow rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be interpreted as being included within the scope of the present invention.

Claims

1. A fixture (100) that is implanted in the jawbone and acts as a tooth root, A cover screw (400) that is inserted and fixed into the fixture (100) to secure the fixing force of the fixture (100), An abutment (200) in which the lower part is inserted into the fixture (100) from which the cover screw (400) is separated and removed, and a crown (10) is joined to the upper part, A fixing screw (300) that fixes the abutment (200) to the fixture (100), It includes a screw cap (500) that is coupled to the abutment (200) and covers the fixing screw (300), Fixture (100) A screw thread (110) for implantation into the alveolar bone is formed at the bottom, A smooth long neck (150) is formed on the upper part, An insertion hole (120) into which an abutment (200) is inserted is formed on the upper part of the long neck (150), An implant structure having a fixture having a long neck formed therein and a cover screw for initial fixation, characterized in that an internal screw thread (140) to which a fixing screw (300) is coupled is formed at the bottom of an insertion hole (120).

2. In claim 1, An implant structure having a fixture and a cover screw for initial fixation, characterized in that the long neck portion (150) is formed with a length of 1 mm to 15 mm and a taper (T) is formed that gradually narrows toward the top.

3. In claim 1, Cover screw (400) A cover body (410) inserted into the insertion hole (120) of the fixture (100), A cover screw thread (420) formed at the lower part of the cover body (410) and coupled to the internal screw thread (140) of the fixture (100), A cover plate (430) formed on the upper part of the cover body (410) and covering the upper part of the fixture (100), A long neck cover (440) formed to be bent downward from the outside of the cover plate (430) and connected to the alveolar bone while wrapping the long neck (150) of the fixture (100), An implant structure having a fixture and a cover screw for initial fixation, characterized in that a long neck portion is formed in the center of a cover plate (430) and includes a wrench hole (450) to which a wrench is connected.

4. In claim 3, An implant structure having a fixture and a cover screw for initial fixation, characterized in that a long neck cover (440) has a screw thread (442) formed on the outer surface thereof to be joined to the alveolar bone, and an inclined surface (441) formed on the screw thread (442) whose outer diameter gradually narrows toward the bottom.

5. In claim 1, Abutment (200) A plurality of support pieces (210) that are connected to the screw cap (500) are formed at regular intervals while being distributed from the top to the outside, A locking projection (220) protruding outward from the support piece (210) is formed, A through hole (230) through which a fixed screw (300) passes is formed to penetrate upward and downward, The neck insertion portion (240) into which the long neck portion (150) of the fixture (100) is inserted is formed to be connected to the lower portion of the through hole (210), Screw cap (500) The support groove (510) is opened downwards by inserting the support pieces (210), An implant structure having a fixture having a long neck formed therein and a cover screw for initial fixation, characterized in that a locking groove (520) is formed on the inner surface of a support groove (510).

6. In claim 5, The support groove (510) of the screw cap (500) is formed by an internal vertical surface (511) that is formed vertically upward from the locking groove (520), and an internal inclined surface (512) that is formed to gradually expand downward from the bottom of the locking groove (520). The support piece (210) of the abutment (200) is in surface contact with the inner vertical surface (511) of the support groove (510), An implant structure having a fixture and a cover screw for initial fixation, wherein an abutment (200) has a long neck formed such that an outer inclined surface (201) formed to gradually narrow from a locking protrusion (220) upwards is in surface contact with an inner inclined surface (512) of a support groove (510).

7. In claim 5, A locking projection (220) is an implant structure having a fixture with a long neck formed in a triangular or semicircular cross-section and a cover screw for initial fixation.

8. In claim 5, In the support groove (510) of the screw cap (500), insertion protrusions (530) are formed to be distributed between the support pieces (210) to expand the spacing between the support pieces (210). An implant structure having a fixture and a cover screw for initial fixation, characterized in that the insertion projection (530) is formed with a lower width (d4) narrower than the upper width (d3).

9. In claim 5, The screw cap (500) is inserted between the support pieces (210) and an expansion projection (540) that expands the gap between the support pieces (210) is formed in the center of the upper part of the support groove (510). An implant structure having a fixture and a cover screw for initial fixation, wherein the extension protrusion (540) is formed in an inverted cone shape and has a long neck portion.

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