abutment assembly

Abstract

Disclosed is an abutment assembly. The abutment assembly can include an implant implanted in alveolar bone and having a first inner groove formed with a first inner peripheral threaded portion; an abutment having a second inner groove formed in the center thereof and provided with a second inner peripheral threaded portion, and inserted and coupled to the first inner groove; a lower connector having a first through-hole extending upward and downward formed in the center thereof and coupled to the second inner groove; a crown having a second through-hole extending upward and downward formed in the center thereof and provided with a lower groove in which the lower connector is coupled in the lower portion of the second through-hole; and a retaining screw inserted into the second through-hole and coupled to the lower connector, and formed with an outer threaded portion that is screwed with the second inner peripheral threaded portion of the abutment.

Description

[Technical Field] This invention relates to base assembly. [Background Technology] Generally speaking, an abutment assembly refers to an artificial substitute configured to reproduce the same shape and function as a natural tooth. It includes: an implant with threads formed on its outer peripheral surface to mimic the shape of the root of a natural tooth and installed in the alveolar bone; an abutment connected to the upper part of the implant and having an artificial tooth attached thereto; and fixing screws for fixing the implant and the abutment to each other.

[0003] The methods of attaching a crown, which is an artificial tooth, to the abutment are generally divided into screw fastening, cement bonding, and a combination of screw fastening and cement bonding.

[0004] First, in the case of screw fastening, although the restoration, which is integrally formed with the abutment, is fastened to the implant embedded in the alveolar bone by screws, there is a disadvantage that the restoration may deform due to shrinkage during the casting process.

[0005] Furthermore, cement bonding involves first securing the abutment to the implant, and then bonding the restoration to the upper surface of the abutment using dental cement. However, removing the cement exposed on the outside of the crown using cement bonding is time-consuming, and even if it is removed cleanly, the cement inside the crown may leak into the patient's mouth as it dissolves, causing gingivitis and potentially leading to implant dislodgement. Additionally, hybrid fastening methods using screws and cement also suffer from screw loosening and the potential for residual cement to cause gingivitis; therefore, cement bonding is gradually being phased out.

[0006] On the other hand, in abutment assemblies of restorations that include screw fastening, in order to combine the abutment with the restoration, a connecting member is installed inside the restoration by pressing. In this case, by forcibly pressing and fixing the metal connecting member into the zirconia restoration, the connecting member may deform with the size of the restoration, which may lead to long-term stability issues.

[0007] Therefore, there is a need for an abutment component assembly system and assembly method that can firmly bond the connecting components to the restoration without deformation, even without the use of cement, and achieve a firm bond between the crown and the abutment.

[0008] [Detailed Description of the Invention] [Technical Issues] The present invention was made to solve the problems of the prior art described above. The purpose of the present invention is to provide an abutment assembly that can firmly bond the crown to the abutment even without the use of dental cement and can be accurately assembled to minimize deformation of the restoration and components.

[0009] [Technical Solution] To achieve the above-mentioned problem, an abutment assembly according to an embodiment of the present invention may include: an implant implanted into the alveolar bone and having a first internal groove having a first internal circumferential thread portion; an abutment having a second internal groove having a second internal circumferential thread portion formed in the center and inserted into the first internal groove; a lower connector having a first through hole extending vertically in the center and connected to the second internal groove; a crown having a second through hole extending vertically in the center and having a lower groove connected to the lower connector at the lower part of the second through hole; and a retaining screw inserted into the second through hole and connected to the lower connector, and having an external thread portion formed that engages with the second internal circumferential thread portion of the abutment.

[0010] Additionally, the lower connector includes a first anti-rotation part inserted into the lower groove of the crown and a second anti-rotation part inserted into the second inner groove of the base. The lower groove of the crown includes a circular mating surface that engages with the first anti-rotation part. A recess is formed on the mating surface. The first anti-rotation part includes a protrusion corresponding to the recess. The cross-section of the second anti-rotation part is polygonal. The second inner groove may include a polygonal portion corresponding to the second anti-rotation part.

[0011] In addition, the first through hole of the lower connector may be provided with a third inner circumferential thread portion that can be screwed into by the external thread portion of the retaining screw.

[0012] Additionally, the second through hole of the crown is provided with a stepped portion, and the retaining screw may include: a screw with a head formed on the upper part and an external threaded portion formed on the lower part that engages with the threaded portion of the first inner circumferential surface; a support portion arranged below the head and hooking and supporting the stepped portion of the crown; and a retaining portion extending from below the support portion and engaging with the lower side of the first through hole of the lower connector.

[0013] In addition, the screw and the retaining part can be integrally formed.

[0014] In addition, the inner circumferential surface of the support portion is provided with a fourth inner circumferential surface thread portion that can be screwed into the external thread portion of the retaining screw, thereby allowing the retaining portion to be screwed into the screw.

[0015] Additionally, the lower connecting portion includes a connecting piece that is separated by a groove and can be elastically deformed radially. A locking protrusion is formed on the outer surface of the connecting piece. An inner vertical portion with a certain inner diameter is formed in the first through hole of the lower connector, and an enlarged hole portion is disposed below the inner vertical portion and connected with the locking protrusion. When the connecting piece passes through the inner vertical portion, it contracts radially inward and expands radially outward at the enlarged hole portion, thereby elastically connecting to the inner circumferential surface of the first through hole.

[0016] In addition, the cross-section of the lower joint is circular, and the lower joint is inserted into the first through hole of the lower connector, so that its outer peripheral surface can be in close contact with the inner peripheral surface of the first through hole.

[0017] [Invention Effects] The abutment assembly according to the invention has the advantage of achieving long-term stability because it can be assembled quickly and accurately even without the use of dental cement, thereby minimizing deformation of the restoration and components, and also has the advantage of eliminating inflammation caused by dental cement.

[0018] The effects of the present invention are not limited to those described above, but should be understood to include all effects that can be inferred from the detailed description of the invention or the inventive structure described in the claims.

[0019] [Brief description of the attached image] Figure 1 This is a perspective view of a base assembly according to an embodiment of the present invention.

[0020] Figure 2 This is an exploded view of a base assembly according to an embodiment of the present invention.

[0021] Figure 3 This is a cross-sectional view of a base assembly according to an embodiment of the present invention.

[0022] Figure 4 (a) and (b) are, respectively, a three-dimensional view and a cross-sectional view of the implant in the abutment assembly.

[0023] Figure 5 (a) and (b) are, respectively, a perspective view and a sectional view of the base in the base assembly.

[0024] Figure 6 (a) to (c) are, respectively, perspective, plan view and sectional view of the lower connector in the base assembly.

[0025] Figure 7 (a) to (c) are, respectively, a perspective view, a plan view, and a sectional view of the crown in the base assembly.

[0026] Figure 8(a) to (c) are perspective and sectional views of the retaining screws in the base assembly, respectively.

[0027] Figure 9 This is an exploded perspective view of a base component assembly system according to an embodiment of the present invention.

[0028] Figures 10 to 11 The accompanying drawing illustrates the process of assembling a repair assembly using a base component assembly system.

[0029] Figure 12 The accompanying drawing illustrates the process of assembling the prosthesis assembly onto the abutment secured to the implant.

[0030] [Methods of Implementing the Invention] To fully understand the present invention, its advantages in operation, and the objectives achieved by practicing the present invention, reference should be made to the accompanying drawings illustrating preferred embodiments of the invention and the contents described therein.

[0031] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings, which illustrate preferred embodiments of the invention. Like reference numerals in the drawings denote like parts.

[0032] Figure 1 This is a perspective view of a base assembly according to an embodiment of the present invention. Figure 2 This is an exploded view of a base assembly according to an embodiment of the present invention. Figure 3 This is a cross-sectional view of a base assembly according to an embodiment of the present invention.

[0033] Reference Figures 1 to 3 The abutment assembly (1000) includes an implant (100), an abutment (200), a lower connector (300), a crown (400), and retaining screws (HS).

[0034] Figure 4 (a) and (b) are, respectively, a three-dimensional view and a cross-sectional view of the implant in the abutment assembly.

[0035] Reference Figure 2 , Figure 3 and Figure 4 The implant (100) is shaped like a natural tooth root to function as a tooth root. Furthermore, a first internal groove (110) is formed in the center of the implant (100), and a first internal circumferential threaded portion (120) is provided at the lower part of the first internal groove (110). The first internal circumferential threaded portion (120) is coupled to a second external circumferential threaded portion (220) of the abutment (200). A first external circumferential threaded portion (130) is formed on the outer circumferential surface of the implant (100), and the implant (100) is inserted into and coupled to the inner side of the alveolar bone.

[0036] Figure 5(a) and (b) are, respectively, a perspective view and a cross-sectional view of the base in the base assembly.

[0037] Reference Figure 2 , Figure 3 and Figure 5 The abutment (200) is attached to the implant (100) to support the lower connector (300) and the crown (400), and a second internal groove (240) is formed on the upper surface of the lower connector (300) in order to enable it to be attached.

[0038] In addition, the base (200) includes a lower side (210), a second outer peripheral threaded portion (220), and an upper side (230).

[0039] The lower part (210) is inserted into the first internal groove (110) of the implant (100), and the outer peripheral surface of the lower part (210) can be formed into a cone shape with a gradually decreasing diameter towards the lower side. In addition, the upper surface (211) of the lower part (210) can support the lower end face of the crown (400).

[0040] The second outer peripheral threaded portion (220) extends below the lower side portion (210), and its outer peripheral surface is provided with threads that engage with the first inner peripheral threaded portion (120) of the implant (100).

[0041] The upper part (230) protrudes from the upper part of the lower part (210) toward the outside of the implant (100). The cross-section of the upper part (230) is circular and can be formed into a pyramid shape with the outer diameter decreasing towards the top.

[0042] The second inner groove (240) of the base (200) may include an inner inclined portion (241), a polygonal portion (242) and a second inner circumferential threaded portion (243).

[0043] More specifically, the second internal groove (240) of the base (200) includes: an inner inclined portion (241) with a circular cross-section extending downward from the upper end face inlet to a certain depth, and the inner diameter decreasing towards the bottom; a polygonal portion (242) with a polygonal cross-section extending downward from a certain depth below the inner inclined portion (241) and engaging with the lower connector (300); and a second inner circumferential threaded portion (243) disposed below the polygonal portion (242), the second inner circumferential threaded portion (243) engaging with a screw (600).

[0044] Figure 6 (a) to (c) are, respectively, perspective, plan view and sectional view of the lower connector in the base assembly.

[0045] Reference Figure 2 , Figure 3 and Figure 6The lower connector (300) is combined with the retaining part (500) to connect the base (200) and the crown (400). It can be made of metal materials such as titanium, but is not limited to them.

[0046] The lower connector (300) and retaining screws (HS) are fastened to the abutment (200) in the state of engagement with the crown (400) (restor assembly). The lower connector (300) includes a first anti-rotation portion (310) and a second anti-rotation portion (320), and a first through hole (330) extending vertically is formed in the center of the lower connector (300). The first anti-rotation portion (310) engages with the lower groove (410) of the crown (400), preferably with the engagement surface (412). At this time, the lower groove of the crown (400) includes a circular engagement surface (412) that engages with the first anti-rotation portion (310), the engagement surface (412) having a recess (412a), and the first anti-rotation portion (310) may have one or more protrusions (311).

[0047] The protrusion (311) protrudes radially outward from the outer surface of the first anti-rotation part (310), and a recess (412a) corresponding to the protrusion (311) is formed on the mating surface (412), thereby forming a concave-convex joint between the lower connector (300) and the crown (400).

[0048] That is, the first anti-rotation part (310) corresponds to the recess (412a), and the protrusion (311) can be aligned with the flat part (413) formed on the mating surface (412) of the crown (400).

[0049] In addition, when the protrusion (311) is aligned and engaged with the flat part (413), the crown (400) can be prevented from rotating relative to the lower connector (300).

[0050] On the other hand, the second anti-rotation part (320) is inserted into and supported in the second internal groove (240) of the base (200), and includes a lower extension (321) and a second anti-rotation surface (322).

[0051] The lower extension (321) extends downward from the bottom surface of the first anti-rotation portion (310), and its cross-section may be formed as a circle. In an exemplary embodiment, a portion of the outer surface of the lower extension (321) may be formed as a cone with an angle corresponding to the inner inclined portion (241).

[0052] The lower part of the lower extension (321) can be formed into a polygonal shape corresponding to the polygonal part (242) of the base (200). Specifically, a plurality of second anti-rotation surfaces (322) can be formed in the lower part of the lower extension (321), which are formed into a shape in which one side of the outer peripheral surface of the lower extension (321) is cut in the vertical direction.

[0053] That is, when the second anti-rotation surface (322) is aligned and engaged with the polygonal portion (242) of the base (200), the lower connector (300) can be prevented from rotating relative to the base (200).

[0054] In an exemplary embodiment, for one of the plurality of second anti-rotation surfaces (322), the protrusion (311) of the first anti-rotation part (310) may be formed in a right-angle manner in the same direction, and in addition, a separate mark (identification mark) may be marked on the second anti-rotation surface (322) located in the same direction as the protrusion (311).

[0055] When the first anti-rotation part (310) of the lower connector (300) enters the lower groove (410) of the crown (400), the alignment between the protrusion (311) of the lower connector (300) and the flat part (413) of the crown (400) cannot be visually confirmed, and therefore may change during the entry process. At this time, if one of the multiple second anti-rotation surfaces (322) (the surface that becomes the identification mark) is formed in the same direction as the protrusion (311), then the alignment between the protrusion (311) and the flat part (413) of the crown (400) can be visually confirmed through that one of the multiple anti-rotation surfaces (322).

[0056] The first through hole (330) may include: an inner vertical portion (331) with a circular cross-section and a constant inner diameter extending downward from the upper end face inlet to a certain depth; and an enlarged portion (332) formed below the inner vertical portion (331) and having an inner diameter greater than that of the inner vertical portion (331).

[0057] Furthermore, a third inner circumferential thread (333) may be formed in the first through hole (330). The screw (600) may temporarily engage with the third inner circumferential thread (333) as it passes through the first through hole (330).

[0058] Figure 7 (a) to (c) are, respectively, a perspective view, a plan view, and a sectional view of the crown in the base assembly.

[0059] Reference Figure 2 , Figure 3 and Figure 7 The crown (400) forms the shape of the artificial tooth and can be custom-made using a CAD or CAM system based on a database registered with dental laboratories. The crown (400) can be made of zirconium oxide, but is not limited to this material.

[0060] A lower groove (410) is formed at the lower part of the crown (400), and a second through hole (420) is formed in the center, which communicates with the lower groove (410) and extends vertically.

[0061] Specifically, the lower groove (410) may include an inclined support surface (411), a mating surface (412), and a flat portion (413). The inclined support surface (411) has a circular cross-section and may be formed into a cone shape with an inner diameter that gradually decreases from the lower end of the lower groove (410) upwards.

[0062] The mating surface (412) is recessed upward to a certain depth from the upper end of the inclined support surface (411) and can be formed into a cylindrical shape. The mating surface (412) is opposite to the outer surface of the first anti-rotation part (310) of the lower connector (300).

[0063] Additionally, one or more planar portions (413) may be formed on the mating surface (412), which are formed perpendicular to the radial direction of the lower groove (410). A recess (412a) is formed on the planar portion (413) to lock and align the protrusion (311) of the lower connector (300), thereby preventing the crown (400) from rotating relative to the lower connector (300).

[0064] Furthermore, the second through hole (420) may be provided with a stepped portion (421) that protrudes radially inward. The stepped portion (421) may be hooked and supported by the support portion (510) of the upper connecting portion (500). The upper surface of the stepped portion (421) may be formed into a downwardly sloping surface.

[0065] Figure 8 (a) to (c) are perspective and sectional views of the retaining screws in the base assembly, respectively.

[0066] Reference Figure 2 , Figure 3 and Figure 8 A retaining screw (HS) generally comprises a screw (600) and a retaining portion (500).

[0067] First, the screw (600) passes through the second through hole (420) of the crown (400) and engages with the second inner circumferential threaded portion (243) of the base (200). It may be made of a metal material such as titanium, but is not limited thereto. The screw (600) includes a head (610) and a shank (620).

[0068] The upper surface of the head (610) may be formed with a drive groove for inserting and rotating a dental actuator. The drive groove may include six recesses spaced circumferentially on the inner wall of the head (610) for inserting a hexagonal dental actuator. However, it is not limited to this; the drive groove may also correspond to triangular, quadrangular, or pentagonal dental actuators by changing the number of recesses.

[0069] The lower end of the head (610) may be formed with a tapered portion (611). The tapered portion (611) is the part connecting the head (610) and the rod portion (620), and may be formed such that its diameter gradually decreases towards the lower end. When the screw (600) passes through the second through hole (420) of the crown (400) and is screwed into the second inner circumferential thread portion (243) of the base (200), the tapered portion (611) is supported by the bearing portion (511) of the retaining portion (500).

[0070] At this time, since the metal screw (600) is supported on the bearing portion (511) of the metal retaining portion (500), the friction between them is increased, thereby preventing the screw (600) from loosening.

[0071] The rod (620) is a cylindrical part that extends long from the tapered part (611) along the length direction, and an external thread (621) is formed on part of its outer peripheral surface that engages with the second inner peripheral thread (243) of the base (200).

[0072] Next, the retaining portion (500) includes: a support portion (510) disposed below the head (600) and hooked to the step portion (421) supported on the crown (400); and a lower connecting portion (520) extending below the support portion (510) and engaging with the first through hole (330) of the lower connector (300).

[0073] At this time, the screw (600) and the retaining part (500) can be integrally formed, but are not limited thereto.

[0074] That is, the retaining part (500) can be detachably screwed onto the screw (600), or it can be made into an integral structure.

[0075] Furthermore, the inner circumferential surface of the support portion (500) is provided with a fourth inner circumferential surface thread portion (512) that can be screwed into by the external thread portion (621) of the screw (600), thereby allowing the retaining portion (500) to be screwed into the screw (600). Additionally, a thread (not shown) may also be formed on the screw (600) at a position corresponding to the fourth inner circumferential surface thread portion (512).

[0076] On the other hand, the retaining part (500) has a third through hole (530) extending vertically in the center, and includes a support part (510) and a lower connecting part (520). The upper connecting part (500) may be made of a metal material such as titanium, but is not limited thereto.

[0077] The support portion (510) is cylindrical and has an outer diameter that is larger than the inner diameter of the step portion (421). A portion of the outer surface of the support portion (510) may be formed into a cone shape corresponding to the slope of the step portion (421).

[0078] The upper surface of the support (510) may be provided with a bearing portion (511), the inner diameter of which becomes narrower towards the lower side. The bearing portion (511) can support the head (610) of the screw (600), and more specifically, can support the tapered portion (611) formed at the lower end of the head (610).

[0079] The lower joint (520) is radially elastically deformable and includes at least two joint pieces (521) that are distinguished by longitudinal grooves (522) extending from the support (510) to the lower end.

[0080] The grooves (522) can be formed at circumferential intervals along the lower joint (520), such that adjacent lower grooves (522) form equal angles. For example, the lower grooves (522) can be formed at 90-degree intervals relative to the center of the third through hole (530), thereby forming a total of 4 joint pieces (521) in the lower joint (520). However, the number of lower grooves (522) is not limited to this, and various numbers can be formed as needed.

[0081] The lower connecting portion (520) can be fastened to the first through hole (330) of the lower connector (300) by a snap-fit ​​engagement. Specifically, the connecting piece (521) has a diameter corresponding to the inner vertical portion (331) of the first through hole (330). The end of the connecting piece (521) may be formed with a radially outward protruding locking protrusion (523). This locking protrusion (523) can guide to engage with the enlarged portion (332) of the lower connector (300) in a snap-fit ​​engagement.

[0082] That is, when the first through hole (330) is inserted, the connecting piece (521) can elastically contract and deform due to the contact between the locking protrusion (523) and the inner surface of the inner vertical portion (331). Thereafter, when the connecting piece (521) is fully inserted into the first through hole (330), the locking protrusion (523) passes over the inner vertical portion (331) and is placed in the enlarged hole portion (332), thereby elastically restoring itself.

[0083] In an exemplary embodiment, when the screw (600) is inserted into the second through hole (530), the connecting piece (521) of the lower connecting portion (520) can expand outward from the shank (620) of the screw (600) and come into close contact with the inner vertical portion (331). Thus, the connection between the lower connector (300) and the retaining portion (500) can be formed more firmly.

[0084] Thus, the retaining part (500) snaps into the lower connector (300), providing a secure feel to the user, thereby allowing the crown (400) to be detachably secured to the abutment (200). That is, even without cement, the crown (400) can be secured to the abutment (200), thereby preventing the crown (400) from shifting out of position due to gingival retraction.

[0085] In addition, when subjected to external force, the lower connector (300) and the retaining part (500) reproduce the movement of natural teeth through elastic deformation, thereby absorbing and dispersing the external force, mitigating the impact on the alveolar bone during repeated chewing, and realizing the function of the periodontal ligament.

[0086] Figure 9 This is an exploded perspective view of a base component assembly system according to an embodiment of the present invention. Figures 10 to 11 The accompanying drawing illustrates the process of assembling a repair assembly using a base component assembly system. Figure 12 The accompanying drawing illustrates the process of assembling the prosthesis assembly onto the abutment secured to the implant.

[0087] The following is for reference Figures 9 to 12 The process of assembling the prosthesis assembly (lower connector, crown, retaining screws) using the abutment assembly system and the assembly process of the abutment assembly (1000) of the present invention are described in detail.

[0088] First, the base assembly (1000) of the present invention can be assembled by a base assembly assembly system (A), and the base assembly assembly system (A) can include the base assembly (1000) and all the tools and fixtures (or tools) used to assemble the base assembly (1000).

[0089] That is, in addition to the base assembly (1000), the base assembly system (A) may also include a driver (10) and a fixture (2).

[0090] The driver (10) is a tool for fastening the retaining screw (HS), and the clamp (2) is a part that provides an assembly space for placing and assembling the prosthesis assembly.

[0091] First, basically, when performing implant surgery, the process of inserting the abutment (200) into the implant (100) implanted in the alveolar bone and fixing the abutment (200) to the implant (100) is performed.

[0092] Then, as Figures 10 to 11 As shown, this illustrates the process of assembling the repair body.

[0093] The process of assembling the repair assembly involves positioning and engaging the lower connector (300) in the fixture (2). At this time, a polygonal groove corresponding to the second anti-rotation surface (322) of the lower connector (300) is formed in the fixture (2), so that the lower connector (300) can be placed and fixed in a non-rotating state.

[0094] Then, with the lower connector (300) inserted into the clamp (2), the crown (400) is inserted.

[0095] Then, after inserting the retaining screw (HS) into the second through hole (420) of the crown (400), the retaining screw (HS) is threaded into the thread formed inside the clamp (2) by the driver (1).

[0096] Therefore, when the retaining screw (HS) is threaded into the thread of the clamp (2), the lower engagement portion (520) of the retaining portion (500) is engaged with the enlarged portion (332) of the lower connector (300), thereby engaging the retaining portion (500) with the lower connector (300), and finally the lower connector (300) and the retaining screw (HS) can be fastened and assembled inside the crown (400).

[0097] Thus, without directly assembling the components other than the restoration onto the abutment (200) mounted on the alveolar bone, the process of assembling the restoration assembly using the actuator (1) and the clamp (2) is carried out.

[0098] Thus, when the restoration assembly is assembled, the retaining screw (HS) is separated from the clamp (2) by the driver (1), thereby separating the restoration assembly. At this time, even if the threaded engagement between the retaining screw (HS) and the clamp is released, the crown (400), the lower connector (300) and the retaining screw (HS) can remain in a tight state without separating from each other, but are in a state of separation from the clamp (2).

[0099] Then, the assembled restoration assembly is installed on the abutment (200) set in the alveolar bone.

[0100] First, in the assembled repair assembly, the second anti-rotation surface (322) of the second anti-rotation part (320) of the lower connector (300) is aligned with the polygonal part (242) of the base (200) and inserted into the base (200), thus completing the temporary fastening of the crown (400) and the base (200).

[0101] Subsequently, the external thread (621) of the screw (600) is screwed into the second inner circumferential thread (243) of the base (200) using the driver (1), and the tapered part (611) of the screw (600) is supported by the bearing part (521) of the upper connecting part (500), thereby making the connection between the lower connecting part (300), the retaining part (500) and the crown (400) more secure.

[0102] As described above, according to the abutment assembly (1000) of the present invention, due to the bonding structure between the implant (100), abutment (200), lower connector (300), crown (400) and retaining screw (HS), the crown (400) can be firmly bonded to the abutment (200) even without the use of dental cement, thereby eliminating inflammation caused by dental cement.

[0103] The abutment assembly based on the above-described technical concept of the present invention can be assembled quickly and accurately even without the use of dental cement, thereby minimizing the deformation of the restoration and components, thus having the advantage of achieving long-term stability, and also having the advantage of eliminating inflammation caused by dental cement.

[0104] As described above, the preferred embodiments are disclosed in the accompanying drawings and specification. Although specific terminology is used herein, it is for illustrative purposes only and is not intended to limit its meaning or restrict the scope of the invention as set forth in the claims. Therefore, those skilled in the art will understand that various modifications and equivalent embodiments can be made therein. Consequently, the true scope of protection of this invention should be determined by the technical concept of the appended claims.

[0105] [Industrial Applicability] Although the present invention is implemented as an abutment assembly that can securely bond the crown to the abutment without the use of dental cement and can be accurately assembled to minimize deformation of the restoration and components, it is applicable to various industrial sectors within the scope of adopting the same structure as the present invention.

Claims

1. A base assembly, comprising: An implant that is inserted into the alveolar bone and has a first internal groove with a first internal circumferential thread portion; A second internal groove with a second inner circumferential threaded portion is formed in the center, and a base is inserted and engaged with the first internal groove; a first through hole extending vertically is formed in the center, and a lower connector is engaged with the second internal groove; a second through hole extending vertically is formed in the center, and a crown of the lower groove engaged with the lower connector is provided at the lower part of the second through hole; and a retaining screw is inserted into the second through hole and engaged with the lower connector, and has an external threaded portion that engages with the second inner circumferential threaded portion of the base.

2. The base assembly according to claim 1, characterized in that, The lower connector includes a first anti-rotation part inserted into the lower groove of the crown and a second anti-rotation part inserted into the second inner groove of the base.

3. The base assembly according to claim 2, characterized in that, The lower groove of the crown includes a circular mating surface that engages with the first anti-rotation part, and a recess is formed on the mating surface. The first anti-rotation part includes a protrusion corresponding to the recess.

4. The base assembly according to claim 2, characterized in that, The cross-section of the second anti-rotation part is polygonal, and the second internal groove includes a polygonal portion corresponding to the second anti-rotation part.

5. The base assembly according to claim 1, characterized in that, The first through hole of the lower connector is provided with a third inner circumferential thread portion that can be screwed onto the external thread portion of the retaining screw.

6. The base assembly according to claim 1, characterized in that, The second through hole of the crown has a stepped portion, and the retaining screw includes: a screw with a head formed on the upper part and an external threaded portion formed on the lower part that engages with the threaded portion of the first inner circumferential surface; a support portion arranged below the head and hooking and supporting the stepped portion of the crown; and a retaining portion extending from below the support portion and engaging with the lower side of the first through hole of the lower connector.

7. The base assembly according to claim 6, characterized in that, The screw and the retaining part are integrally formed.

8. The base assembly according to claim 6, characterized in that, The inner circumferential surface of the support portion is provided with a fourth inner circumferential thread portion that can be screwed into the external thread portion of the retaining screw, thereby allowing the retaining portion to be screwed into the screw.

9. The base assembly according to claim 6, characterized in that, The lower connecting portion includes a connecting piece that is separated by a groove and can be elastically deformed radially. A locking protrusion is formed on the outer surface of the connecting piece. An inner vertical portion with a certain inner diameter is formed in the first through hole of the lower connector, and an enlarged hole portion is disposed below the inner vertical portion and connected with the locking protrusion. When the connecting piece passes through the inner vertical portion, it contracts radially inward and expands radially outward at the enlarged hole portion, thereby elastically connecting to the inner circumferential surface of the first through hole.

10. The base assembly according to claim 6, characterized in that, The lower joint has a circular cross-section, and the lower joint is inserted into the first through hole of the lower connector, so that its outer peripheral surface is in close contact with the inner peripheral surface of the first through hole.

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