Cylindrical implant and system

Abstract

The utility model discloses a cylindrical implant and system relates to oral implant prosthetic technology field, the cylindrical implant system includes implant body, base and screw, and implant body is hollow cylindrical sleeve structure, has base connecting chamber, and sets up anti -rotation structure on connecting chamber upper portion, and sets up implant inner thread section in lower part, and the outer wall lower part is equipped with the groove and forms petal structure. The base comprises from bottom to top insertion section, cooperation section and prosthetic connecting section, and is equipped with the through base through -hole with base inner thread. The screw is arranged in the base through -hole, and the outer thread is combined with the implant inner thread section and the base inner thread simultaneously, and forms double -threaded locking connection, and the utility model discloses implant simple and reliable structure can improve the anti -loosening ability through double -threaded connection.

Description

Technical Field

[0001] This utility model relates to the field of oral implant restoration technology, and in particular to a cylindrical implant and a cylindrical implant system using the same implant. Background Technology

[0002] Dental implants are currently the primary treatment for tooth loss and reconstruction. Existing dental implants, based on their structural shape, are limited to threaded implants. Threaded implants rely on the threads on their outer surface to mechanically interlock with the bone tissue, achieving initial stability. They are widely used clinically. However, the threads prevent the transmission of masticatory stress deeper into the bone. Stress concentrates at the first threaded tooth and at the thinnest part of the alveolar ridge. Prolonged stress concentration in this thin alveolar bone easily leads to bone resorption, subsequently exposing the implant threads and causing the implant to loosen and fall out.

[0003] In view of this, how to design a new type of implant without threads on the outer wall has become an urgent problem to be solved in the existing technology. Utility Model Content

[0004] In view of the technical problems of insufficient initial stability of cylindrical implants and loose screw connections in the prior art, this utility model provides a cylindrical implant and cylindrical implant system without threaded teeth.

[0005] In a first aspect, this utility model provides a cylindrical implant system, comprising: an implant body, wherein the implant body is a hollow cylindrical sleeve structure having an axially arranged abutment connecting cavity; the upper part of the abutment connecting cavity is provided with an anti-rotation structure, and the lower part of the abutment connecting cavity is provided with an implant internal thread section; the lower part of the outer wall of the implant body is provided with at least two axially extending predetermined slots, the predetermined slots extending upward from the bottom end of the implant body by a predetermined length; an abutment, the abutment comprising, from bottom to top, an insertion section, a mating section, and a repair connecting section, the abutment being provided with a through abutment through hole with internal threads; the outer wall of the insertion section is provided with a structure that connects with the anti-rotation structure. The implant includes a rotating anti-rotation plane that matches the rotating structure; an internal thread on the lower part of the abutment through hole; an insertion section inserted into the abutment connection cavity of the implant body; the bottom surface of the mating section overlapping the top surface of the implant body; and a restorative connection section protruding above the abutment connection cavity to support the restorative crown. A screw, comprising a shank and a head, has an external thread at the lower end of the shank and a tool operating groove at the top of the head. The screw passes through the abutment through hole, and the external thread of the shank engages with the internal thread of the implant and the internal thread of the abutment to axially press and fix the abutment within the implant body.

[0006] In one optional embodiment, the abutment connection cavity is provided with a mating section and a threaded connection section from top to bottom; the anti-rotation structure is provided on the inner wall of the mating section, and the implant internal thread section is provided on the inner wall of the threaded connection section; the inner diameter of the mating section is larger than the inner diameter of the threaded connection section, and a stepped surface is formed between the two, which is used to axially limit the bottom end of the insertion section of the abutment.

[0007] In one optional embodiment, the number of setting slots is two, three, four, five, or six, and each setting slot is evenly and symmetrically distributed along the circumference of the implant body. The axial length of the setting slot is 1 / 4 to 1 / 2 of the total length of the implant body, and the width of the setting slot is 0.3 mm to 1.5 mm. The setting slots form an elastically deformable flap structure at the lower part of the implant body. After the flap structure is implanted, it uses its own elastic recovery force to generate radial compression with the bone tissue to enhance initial stability.

[0008] In one optional embodiment, the abutment through hole is a stepped hole extending along the central axis of the abutment, comprising an upper large-diameter section and a lower small-diameter section from top to bottom; the upper large-diameter section is used to accommodate the head of the screw, and the inner wall of the lower small-diameter section is provided with the internal thread of the abutment; the external thread of the screw shank simultaneously engages with the internal thread of the abutment and the internal thread of the implant, forming a double threaded locking connection between the screw, the abutment and the implant body.

[0009] In one optional embodiment, the pitch of the internal thread of the abutment is the same as the pitch of the internal thread segment of the implant; or, there is a slight difference between the pitch of the internal thread of the abutment and the pitch of the internal thread segment of the implant, so that an axial interference preload is generated between the two after the screw is tightened, forming a differential pitch anti-loosening structure.

[0010] In one optional embodiment, the outer wall of the implant body is a smooth or rough cylindrical surface without external threads; the bottom end of the implant body is provided with a tapered guide tip, the tapered guide tip has a cone angle of 30° to 120°, and its surface is provided with a self-tapping cutting edge, which is connected to the side wall edge of the set groove.

[0011] In one optional embodiment, the restorative connecting segment has a frustum-shaped structure that is wider at the top and narrower at the bottom, with a taper of 3° to 10°; the central axis of the restorative connecting segment is offset by an angle of 0° to 25° from the central axis of the insertion segment to adapt to the direction of the insertion path for different tooth positions.

[0012] In one optional embodiment, the rod body includes a smooth rod section and a threaded rod section from top to bottom; a necking section is provided between the head and the smooth rod section, the outer diameter of the necking section being smaller than the outer diameter of the head and the smooth rod section, for generating elastic tensile deformation when the screw is tightened to provide a continuous axial preload; the tool operating groove at the top of the head is an internal hexagonal groove or an internal Torx groove.

[0013] In one optional embodiment, the total axial length of the implant body is 10mm–20mm, and the outer diameter is 3.0mm–6.0mm; the implant body forms various tooth position adaptation specifications: central incisor adaptation specification, with a total axial length of 12mm–15mm and an outer diameter of 3.0mm–4.0mm; lateral incisor adaptation specification, with a total axial length of 11mm–14mm and an outer diameter of 3.0mm–3.5mm; canine adaptation specification, with a total axial length of 15mm–20mm and an outer diameter of… 3.5mm~4.5mm; First premolar fit specifications, axial total length 12mm~15mm, outer diameter 3.5mm~4.5mm; Second premolar fit specifications, axial total length 11mm~14mm, outer diameter 3.5mm~4.5mm; First molar fit specifications, axial total length 12mm~16mm, outer diameter 4.5mm~6.0mm; Second molar fit specifications, axial total length 11mm~15mm, outer diameter 4.5mm~5.5mm.

[0014] Secondly, this utility model also provides a cylindrical implant, including an implant body, the implant body being a hollow cylindrical sleeve structure having an axially arranged abutment connecting cavity, the abutment connecting cavity being used to accommodate the abutment and to achieve a threaded connection with a screw; the abutment connecting cavity having an abutment mating section and a threaded connection section sequentially arranged from top to bottom, the inner diameter of the abutment mating section being larger than the inner diameter of the threaded connection section, forming a stepped surface between the two; the inner wall of the abutment mating section having an anti-rotation structure, the anti-rotation structure being at least a pair of symmetrically distributed planar cutting surfaces arranged on the inner wall; the inner wall of the threaded connection section having an implant internal thread section; the lower part of the outer wall of the implant body having at least two axially extending predetermined slots, the predetermined slots extending upward from the bottom end of the implant body by a predetermined length.

[0015] The beneficial effects of this invention are as follows: By setting a groove at the lower part of the outer wall of the implant body to form a flap structure, the elastic flap can elastically contract radially when the implant is inserted into the bone tissue to smoothly pass through the implantation socket. After implantation, the elastic flap uses its own restoring force to generate a continuous radial compressive force on the bone wall, which significantly improves the initial stability of the cylindrical implant. By setting an internal thread of the abutment at the lower part of the abutment through hole, the external thread of the screw can simultaneously engage with the internal thread of the implant and the internal thread of the abutment, forming a double threaded locking connection between the screw, the abutment, and the implant body. Compared with the traditional single threaded connection method, the double threaded locking structure greatly increases the thread engagement length and contact area, improves the anti-rotation loosening ability, and can be further improved by setting a differential pitch. The axial interference preload generated between the two threaded sections further inhibits the gradual unrotation of the screw under cyclic biting load, thereby effectively reducing the incidence of screw loosening complications. By setting an anti-rotation structure on the inner wall of the abutment mating section of the abutment connection cavity and cooperating with the anti-rotation plane of the abutment, reliable circumferential positioning between the abutment and the implant body is achieved, preventing the abutment from rotating and shifting under functional load. By setting a tapered guide tip and a self-tapping cutting edge at the bottom of the implant body, the implant can cut bone tissue on its own and accurately position itself in the predetermined direction during implantation, simplifying the surgical procedure and reducing the precision requirements for cavity preparation. The overall structure is simple in design, reliable in assembly, and convenient in implantation operation, suitable for implant restoration in different tooth positions, and has good clinical application value.

[0016] Three-dimensional finite element analysis revealed that, due to the absence of obstruction from the threaded teeth, most of the chewing stress can be directly transmitted to the lower part of the implant (where the bone wall is thicker than the surface layer and has stronger resistance). The stress on the implant surface and alveolar ridge crest is greatly dispersed, thereby protecting the bone of the alveolar ridge crest, reducing the risk of the implant being exposed due to bone resorption, and improving the long-term success rate of the implant. Attached Figure Description

[0017] This specification sets forth the complete and illustrative disclosure of this application, including its best practices, to those skilled in the art. Reference is made to the accompanying drawings, in which: Figure 1 A perspective view of a cylindrical implant according to an embodiment of the invention is shown. Figure 2 A top view of a cylindrical implant according to an embodiment of the invention is shown; Figure 3 A bottom view of the structure of a cylindrical implant according to an embodiment of the invention is shown; Figure 4 A cross-sectional view of a cylindrical implant according to an embodiment of the invention is shown. Figure 5A schematic diagram of the structural assembly of a cylindrical implant system according to an embodiment of the invention is shown; Figure 6 A perspective view of a base according to an embodiment of the invention is shown; Figure 7 A front view of a base structure according to an embodiment of the invention is shown; Figure 8 A cross-sectional view of a base according to an embodiment of the invention is shown; Figure 9 A structural diagram of a screw for fixing a base is shown according to an embodiment of the invention.

[0018] Explanation of reference numerals in the attached drawings: 1. Implant body; 11. Abutment connection cavity; 111. Anti-rotation structure; 112. Internal threaded section of the implant; 12. Setting groove; 2. Abutment; 21. Insertion section; 22. Mating section; 23. Repair connection section; 24. Abutment through hole; 25. Anti-rotation plane; 26. Internal thread of the abutment; 3. Screw; 31. Rod body; 32. Head. Detailed Implementation

[0019] The embodiments of this application will now be described in detail with reference to the figures, including one or more examples of the embodiments of this application. Each example is provided for the purpose of explaining this application and not for limiting it. In fact, those skilled in the art will understand that various modifications and variations can be made to this application without departing from the scope or spirit of this application. For example, a feature illustrated or described as part of one embodiment may be used with another embodiment to produce yet another embodiment. As used in this specification, the terms “first,” “second,” etc., are used interchangeably to distinguish one component from another and are not intended to indicate the location or importance of the components. As used in this specification, unless the context clearly indicates otherwise, the terms “a,” “an,” “the,” and “the” are intended to indicate the presence of one or more elements. The terms “comprising,” “including,” and “having” are intended to be inclusive and mean that there may be other elements in addition to those listed.

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] like Figures 1 to 4As shown, this utility model provides a cylindrical implant, which includes an implant body 1. The implant body 1 is a hollow cylindrical sleeve structure, with an overall straight cylindrical shape, and has an abutment connection cavity 11 arranged along the axial direction. The abutment connection cavity 11 is an inner cavity that runs through or partially runs through the central axis of the implant body 1, and is used to accommodate the abutment 2 and achieve a threaded connection with a screw 3. The outer wall of the implant body 1 is a smooth or rough cylindrical surface, without external threads, which eliminates the need for thread tapping during implantation, simplifying the surgical procedure and reducing surgical trauma. The implant body 1 can be made of any one of medical grade 4 pure titanium, Ti-6Al-4V titanium alloy, or Ti-6Al-4V ELI titanium alloy to meet biocompatibility and mechanical performance requirements.

[0022] like Figure 2 and Figure 4 As shown, the base connecting cavity 11 is provided with a base mating section and a threaded connection section from top to bottom. The base mating section is located at the upper part of the base connecting cavity 11, and its inner diameter is larger than that of the threaded connection section, forming a stepped surface between the base mating section and the threaded connection section. This stepped surface axially limits the bottom end of the insertion section 21 after the base 2 is inserted, preventing the base 2 from being over-inserted in the axial direction. The inner wall of the base mating section is provided with an anti-rotation structure 111, such as... Figure 2 As shown, the anti-rotation structure 111 consists of at least a pair of symmetrically distributed planar cutting surfaces on the inner wall of the abutment mating section. In a preferred embodiment, the anti-rotation structure 111 is an internal hexagonal structure, that is, six planar cutting surfaces are evenly arranged circumferentially on the inner wall of the abutment mating section to form a regular hexagonal cross-section. In other embodiments, the anti-rotation structure 111 can also be an internal quadrilateral structure, an internal triangular structure, or other polygonal structures, and this utility model does not impose specific limitations on this. The anti-rotation structure 111 can cooperate with the anti-rotation plane 25 on the abutment 2 to effectively prevent the abutment 2 from rotating circumferentially relative to the implant body 1, ensuring the directional stability of the restored crown. The threaded connection section is located below the abutment mating section, and its inner wall is provided with an implant internal thread section 112 for screwing into the external thread of the screw 3.

[0023] like Figure 1 and Figure 3As shown, the lower part of the outer wall of the implant body 1 is provided with a setting groove 12. The setting groove 12 is a strip-shaped slit extending along the axial direction of the implant body 1, extending upward from the bottom end of the implant body 1 for a predetermined length, and its radial depth penetrates the wall thickness of the implant body 1. The number of setting grooves 12 is at least two, and in different embodiments, there can be two, three, four, five, or six. Each setting groove 12 is evenly and symmetrically distributed along the circumference of the implant body 1. In a preferred embodiment, the number of setting grooves 12 is two, and the two setting grooves 12 are arranged symmetrically in the radial direction. The axial length of the setting groove 12 is 1 / 4 to 1 / 2 of the total length of the implant body 1, and the width is 0.3 mm to 1.5 mm. The setting groove 12 divides the lower part of the implant body 1 into several elastic flaps, and each elastic flap is spaced apart from the other by the setting groove 12. The flap structure gives the lower part of the implant body 1 elastic deformation capability in the radial direction. When the implant is inserted into the prepared bone cavity, the elastic flap can contract radially to allow the implant to pass smoothly through the bone wall. After the implant is in place, the elastic flap uses the elastic recovery force of its own material to open outward, generating a continuous radial compression force on the surrounding bone wall, thereby significantly enhancing the initial stability of the implant.

[0024] The slot can be a longitudinal slot, a transverse slot, or an oblique slot.

[0025] Continue to refer to Figure 3 and Figure 4 The implant body 1 has a tapered guide tip at its bottom. Located at the very bottom of the implant body 1, the tapered guide tip is cone-shaped with a cone angle of 30°–120°. In a preferred embodiment, the cone angle is set to 60°–90°, ensuring good guiding performance while avoiding excessive bone damage during implantation due to an overly sharp tip. The surface of the tapered guide tip may further be provided with a self-tapping cutting edge, which connects with the sidewall edge of the pre-set groove 12, allowing the implant to self-cut bone tissue during implantation and accurately position itself along a predetermined path, reducing reliance on the precision of the pre-set hole. The beneficial effects of this embodiment are: the flap structure formed by the pre-set groove 12 gives the cylindrical implant the ability to actively acquire initial stability, while the tapered guide tip combined with the self-tapping cutting edge simplifies the implantation operation and reduces the difficulty of the surgery.

[0026] In one optional embodiment, the outer wall surface of the implant body 1 can undergo differentiated surface treatment. Along the axial direction, the outer wall of the implant body 1 is divided into a smooth neck region and a rough body region. The smooth neck region is located within 0mm to 3mm below the tip of the implant body 1, and its surface remains smooth after machining, with a surface roughness Ra less than or equal to 0.5 micrometers, which is beneficial for soft tissue adhesion and sealing, and reduces plaque buildup. The rough body region, located below the smooth neck region, is treated with at least one of the following processes: sandblasting and acid etching, anodizing, or micro-arc oxidation, forming a micro-nano-scale rough surface structure with a surface roughness Ra of 1.0 to 3.0 micrometers, which is beneficial for promoting osteoblast attachment, proliferation, and differentiation, and accelerating the osseointegration process. This surface treatment scheme addresses both the clinical needs of soft tissue sealing and osseointegration.

[0027] In one optional embodiment, the top surface of the implant body 1 is a precision-ground plane with a surface roughness Ra less than or equal to 0.3 micrometers, used to form a high-precision planar connection with the bottom surface of the mating section 22 of the abutment 2. This precision planar connection can effectively reduce the micro-gap between the abutment and the implant body, preventing oral bacteria from seeping into the implant cavity along the interface and reducing the risk of peri-implantitis. The top entrance of the abutment connection cavity 11 may also be provided with a chamfered surface with a cone angle of 30° to 60°. This chamfered surface plays a guiding and self-centering role when the abutment 2 is inserted, enabling the abutment 2 to be quickly and accurately centered and inserted, improving the convenience of clinical operation.

[0028] In an optional embodiment, a sealing section may be provided at the bottom of the abutment connection cavity 11 below the threaded section 112 within the implant. The inner diameter of the sealing section is less than or equal to the minor diameter of the threaded section 112 within the implant, forming a smooth inner wall with a narrowed inner diameter. When the screw 3 is screwed in, the end of the screw 3 enters the sealing section area, and a narrow gap is formed between the inner wall of the sealing section and the screw shank, acting as a barrier to prevent bacteria from leaking to the bottom of the implant. This sealing section and the top precision plane fit together to form a double sealing system for the implant body 1, further improving the microleakage resistance of the implant system. The beneficial effects of this embodiment are: the combined design of differentiated surface treatment, precision plane fitting, and bottom sealing section comprehensively enhances the biological performance and antibacterial sealing performance of the implant.

[0029] like Figures 5 to 8 As shown, this utility model also provides a cylindrical implant system, which includes the aforementioned implant body 1, abutment 2, and screw 3. The abutment 2, as an intermediate structural component connecting the implant body 1 and the restorative crown, directly affects the mechanical stability and bio-sealing performance of the implant restoration.

[0030] like Figures 6 to 8As shown, the abutment 2 is a one-piece cylindrical structure, comprising, from bottom to top, an insertion section 21, a mating section 22, and a repair connection section 23. The insertion section 21, located at the bottom of the abutment 2, is cylindrical, and its outer diameter matches the inner diameter of the mating section of the abutment connection cavity 11 of the implant body 1. The outer wall of the insertion section 21 has an anti-rotation plane 25, such as... Figure 6 and Figure 7 As shown, the anti-rotation plane 25 is a flat surface extending along the axial direction, and its number and distribution correspond to the anti-rotation structure 111 in the inner cavity of the implant body 1. For example, when the anti-rotation structure 111 is an internal hexagonal structure, the anti-rotation plane 25 is correspondingly six flat surfaces evenly distributed circumferentially, forming an external hexagonal structure that matches the internal hexagonal structure. When the insertion segment 21 is inserted into the abutment connecting cavity 11, the anti-rotation plane 25 and the planar cutting surface of the anti-rotation structure 111 fit together, effectively preventing the abutment 2 from rotating circumferentially, ensuring that the placement direction of the restorative crown remains stable during use.

[0031] The mating section 22 is located above the insertion section 21, and its outer diameter is larger than that of the insertion section 21, forming a radially expanding step. After the abutment 2 is installed in place, the bottom surface of the mating section 22 overlaps with the top surface of the implant body 1, forming a platform docking interface. In a preferred embodiment, both the bottom surface of the mating section 22 and the top surface of the implant body 1 are precision ground, forming a high-precision planar docking with a surface roughness Ra less than or equal to 0.3 micrometers. This effectively controls the micro-gap at the micrometer level, preventing bacteria from seeping into the implant cavity. A conical transition surface may be provided between the insertion section 21 and the mating section 22. The cone angle of the conical transition surface is 30° to 60°, which mates with the chamfered surface at the top entrance of the abutment connection cavity 11, serving as a guide and self-centering mechanism when the abutment 2 is inserted. In another optional embodiment, the inner wall of the abutment mating section of the abutment connection cavity 11 is a micro-conical surface with a taper of 1:10 to 1:20, and the outer wall of the insertion section 21 is correspondingly provided with a matching micro-conical surface, forming a Morse taper fit between the two. Under the axial preload provided by the screw 3, the Morse taper mating surface can produce a cold welding effect, which greatly enhances the connection rigidity and sealing performance between the abutment 2 and the implant body 1.

[0032] The restorative connecting segment 23, located above the mating segment 22, is the portion of the abutment 2 that protrudes above the top surface of the implant body 1, used to support and fix the restorative crown. For example... Figure 7 and Figure 8As shown, the restorative connector 23 has a frustum-shaped structure, wider at the top and narrower at the bottom, with a taper of 3° to 10°. This frustum-shaped design allows the restorative crown to slide into place along the conical surface, facilitating the installation and removal of the restoration. Simultaneously, the frustum-shaped outer surface helps guide the gingival soft tissue to grow along the outer wall of the restorative connector 23, forming a good transgingival cuff shape, which is crucial for the healthy maintenance of the soft tissue around the implant. In an optional embodiment, the central axis of the restorative connector 23 can be offset by an angle of 0° to 25° from the central axis of the insertion segment 21 to adapt to the placement path direction of different teeth. For example, when used in the anterior region, the angle offset can be set to 15° to 25°, making the placement and removal direction of the restorative crown more reasonable; when used in the posterior region, the angle offset can be set to 0° to 15° to meet the mechanical requirements of axial loading in the posterior region. The beneficial effects of this embodiment are that the three-section structural design of the base 2 rationally allocates the three functions of circumferential positioning, sealing and docking, and repair bearing, with each section performing its own function, resulting in a compact overall structure with complete functions.

[0033] like Figure 8 As shown, the abutment 2 has a through hole 24 at its center. The through hole 24 is a stepped hole extending along the central axis of the abutment 2, consisting of an upper large-diameter section and a lower small-diameter section from top to bottom. The upper large-diameter section is located inside the restorative connection section 23 and the mating section 22. Its inner diameter is larger than the outer diameter of the screw head 32 but smaller than the space for inserting and removing the restorative crown, allowing the screw head 32 to pass through the upper large-diameter section from top to bottom into the through hole 24. The lower small-diameter section is located inside the insertion section 21, and its inner wall has an abutment internal thread 26. The abutment internal thread 26 and the implant internal thread section 112 of the implant body 1 together form a double-threaded mating surface.

[0034] When screw 3 is screwed into the top of the abutment through hole 24, the external thread of its shank 31 first engages with the abutment internal thread 26. As it continues to screw in, the external thread simultaneously engages with both the abutment internal thread 26 and the implant internal thread segment 112. This double-threaded locking connection method has significant advantages in preventing loosening: First, compared with the traditional single-threaded connection, the total thread engagement length and thread contact area of ​​the double-threaded connection are greatly increased, dispersing the contact stress on the thread tooth surface and reducing the load intensity per unit area, thereby reducing thread wear and creep relaxation caused by stress concentration; Second, after screw 3 is tightened, the axial constraint force provided by the abutment internal thread 26 and the axial constraint force provided by the implant internal thread segment 112 form a superposition effect, and the total preload is significantly higher than the preload level of the single-threaded connection, effectively resisting the gradual unscrewing of the screw caused by the engagement cycle load.

[0035] In a further preferred embodiment, the pitch of the abutment internal thread 26 and the pitch of the implant internal thread segment 112 are set to have a slight difference, i.e., a differential pitch design. When the screw 3 is tightened, due to the different pitches of the two thread segments, the external thread of the screw 3 generates axial interference between the two mating surfaces, forming a differential pitch anti-loosening structure. This axial interference ensures that the thread tooth surfaces always maintain a tight compression state, and even under repeated occlusal impact loads, the screw 3 is not prone to loosening. In another embodiment, the pitch of the abutment internal thread 26 and the implant internal thread segment 112 is the same, allowing the screw 3 to be smoothly screwed into both thread segments simultaneously, making the assembly operation more convenient. The beneficial effects of this embodiment are: the double-threaded locking connection structure, especially the differential pitch anti-loosening design, fundamentally solves the clinical pain point of screw loosening in traditional implant systems from a mechanical mechanism perspective, significantly improving the long-term reliability of implant restoration.

[0036] like Figure 9 As shown, screw 3 is a fastener used to fix the abutment 2 to the implant body 1. Screw 3 includes a shaft portion 31 and a head 32. The shaft portion 31 is the main body of screw 3, and from top to bottom includes a smooth shaft section and a threaded shaft section. The smooth shaft section is located above the shaft portion 31 and is a cylinder with a smooth outer surface. Its outer diameter is smaller than the inner diameter of the lower small diameter section of the abutment through hole 24, allowing the smooth shaft section to pass through the lower small diameter section of the abutment through hole 24 without obstruction. The threaded shaft section is located below the shaft portion 31 and has an external thread on its outer surface. This external thread matches the thread parameters of the abutment internal thread 26 and the implant internal thread section 112. A transition arc section can be provided between the smooth shaft section and the threaded shaft section. The radius of the transition arc section is 0.1mm to 0.5mm. The setting of this transition arc section avoids stress concentration at the junction of the smooth shaft section and the threaded shaft section, improving the fatigue resistance of screw 3 under cyclic loads.

[0037] The head 32 is located above the stem 31 and has a cylindrical structure. The outer diameter of the head 32 is larger than the inner diameter of the lower small-diameter section of the abutment through hole 24, but smaller than or equal to the inner diameter of the upper large-diameter section. When the screw 3 is tightened to the correct position, the bottom surface of the head 32 abuts against the stepped surface between the upper large-diameter section and the lower small-diameter section in the abutment through hole 24. Pressure is applied to this stepped surface by the bottom surface of the head 32, pressing the abutment 2 downwards, so that the bottom surface of the mating section 22 fits tightly against the top surface of the implant body 1. The top of the head 32 is provided with a tool operating groove, which is an internal hexagonal groove or an internal Torx groove, for use with a tightening tool to apply tightening torque.

[0038] In a further preferred embodiment, a necking section is provided between the head 32 and the polished shaft section. The necking section is a region with a reduced outer diameter, whose outer diameter is smaller than both the outer diameter of the head 32 and the outer diameter of the polished shaft section. The necking section causes this local cross-section to undergo elastic tensile deformation first when the screw 3 is tightened, acting like a built-in spring, providing continuous axial preload after the screw 3 is tightened. When external loads cause slight loosening of the threaded mating surfaces, the elastic deformation energy stored in the necking section can promptly compensate for the loosening, maintaining a tight contact between the threaded surfaces and further enhancing the screw 3's anti-loosening performance. The designed tightening torque of the screw 3 can be adjusted according to the appropriate tooth position; for example, the designed tightening torque is 15 N·cm to 25 N·cm for anterior teeth and 25 N·cm to 35 N·cm for posterior teeth. The screw 3 can be made of the same medical-grade titanium alloy as the implant body 1 and abutment 2, or titanium alloys of different hardness grades can be selected as needed to optimize thread mating performance. The beneficial effect of this embodiment is that the elastic energy storage design of the necking section and the double thread locking structure work together to build a multi-layer anti-loosening system, which fundamentally improves the long-term reliability of the screw connection.

[0039] In one optional embodiment, the total axial length and outer diameter of the implant body 1 can be designed to match the root length and alveolar bone width of the matched tooth position. The total axial length of the implant body 1 is 10mm to 20mm, and the outer diameter is 3.0mm to 6.0mm. Specifically, the implant body 1 can be formed into the following tooth position matching specifications: central incisor matching specification, with a total axial length of 12mm to 15mm and an outer diameter of 3.0mm to 4.0mm; lateral incisor matching specification, with a total axial length of 11mm to 14mm and an outer diameter of 3.0mm to 3.5mm; canine matching specification, with a total axial length of 15mm to 20mm and an outer diameter of 3.5mm to 4.5mm. Since the canine has the longest root among all teeth, the implant body 1 with the canine matching specification... The total axial length is also the largest; the first premolar fit specification has a total axial length of 12mm to 15mm and an outer diameter of 3.5mm to 4.5mm; the second premolar fit specification has a total axial length of 11mm to 14mm and an outer diameter of 3.5mm to 4.5mm; the first molar fit specification has a total axial length of 12mm to 16mm and an outer diameter of 4.5mm to 6.0mm; the second molar fit specification has a total axial length of 11mm to 15mm and an outer diameter of 4.5mm to 5.5mm.

[0040] In the various tooth position fitting specifications mentioned above, the axial length of the groove 12 is set to vary synchronously with the total axial length of the implant body 1 to ensure that the flap structure can achieve the best elastic retention effect under different specifications. Specifically, when the total axial length of the implant body 1 is less than or equal to 13mm, the axial length of the groove 12 is set to 3mm to 5mm; when the total axial length is 13mm to 17mm, the axial length of the groove 12 is set to 4mm to 7mm; and when the total axial length is greater than or equal to 17mm, the axial length of the groove 12 is set to 5mm to 10mm. The wall thickness of the implant body 1 can also be differentiated according to the tooth position: the wall thickness of the implant body 1 for the anterior region is 0.5mm to 0.8mm, the wall thickness for the premolar region is 0.6mm to 1.0mm, and the wall thickness for the molar region is 0.8mm to 1.5mm. The differentiated design of wall thickness gives anterior implants better elastic deformation capacity to compensate for narrower bone wall conditions, while molar implants have higher structural stiffness to withstand greater occlusal loads.

[0041] In a further preferred embodiment, the implant bodies 1 of the above-mentioned various tooth position adaptability specifications can be assembled into a series of implant sets. Within the same series of sets, implant bodies 1 with different axial total lengths and different outer diameters share the same abutment connection cavity 11 structure; that is, the inner diameter of the abutment mating section, the form and size of the anti-rotation structure 111, and the thread parameters of the implant internal thread section 112 are all consistent. This platform-wide design allows implant bodies 1 of different specifications to be used with abutments 2 and screws 3 of the same specifications, significantly reducing the types of spare parts in clinical inventory, lowering the management cost of the implant restoration system, and improving the standardization of clinical operations. The beneficial effects of this embodiment are: through the tooth position adaptability specification series design, a single implant system can cover the implant restoration needs of all tooth positions in the entire mouth; at the same time, the platform-wide design achieves a high degree of interchangeability of components, taking into account both clinical applicability and economy.

[0042] The cylindrical implant and cylindrical implant system provided by this utility model offer several advantages in terms of initial stability. The flap structure formed by the groove 12 allows the cylindrical implant, with its smooth or rough outer wall, to actively acquire radial elastic retention force, making its initial stability approach or even reach the level of threaded implants. This retains the inherent advantages of cylindrical implants, such as ease of insertion and minimal surgical trauma. Regarding connection reliability, the double-threaded locking connection structure, by increasing the thread engagement length and contact area, combined with a differential pitch anti-loosening design and a necking section elastic pre-tightening mechanism, constructs a multi-layered anti-loosening system. This effectively inhibits screw unwinding under cyclic engagement loads from a mechanical perspective, solving the long-standing clinical complication problem of screw loosening in traditional implant systems. In terms of bio-sealing, the combination of a precision-ground platform interface, a Morse taper fit, and a bottom sealing section creates a double-sealing system, effectively preventing bacteria from seeping into the lumen along the abutment-implant interface and reducing the risk of peri-implantitis. In terms of clinical applicability, the multi-specification implant series designed based on root lengths at different tooth positions, combined with the platform's universal abutment connection cavity design, allows a single system to cover the implant restoration needs of all teeth in the mouth. The highly interchangeable components reduce clinical inventory management costs. This utility model features a simple and reasonable overall structural design and a mature and reliable manufacturing process, demonstrating promising prospects for clinical application.

[0043] The description of this utility model is given for illustrative and descriptive purposes only, and is not intended to be exhaustive or to limit the utility model to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the utility model, and to enable those skilled in the art to understand the utility model and design various embodiments with various modifications suitable for a particular purpose.

[0044] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cylindrical implant system, characterized in that, include: The implant body (1) is a hollow cylindrical sleeve structure with an axially arranged abutment connection cavity (11). The upper part of the abutment connection cavity (11) is provided with an anti-rotation structure (111), and the lower part of the abutment connection cavity (11) is provided with an implant internal thread section (112). The lower part of the outer wall of the implant body (1) is provided with at least two axially extending setting slots (12), and the setting slots (12) extend upward from the bottom end of the implant body (1) by a preset length. The abutment (2) includes, from bottom to top, an insertion section (21), a mating section (22), and a restorative connection section (23). The abutment (2) has a through hole (24) with internal threads. The outer wall of the insertion section (21) has an anti-rotation plane (25) that mates with the anti-rotation structure (111). The lower part of the abutment through hole (24) has an abutment internal thread (26). The insertion section (21) is inserted into the abutment connection cavity (11) of the implant body (1). The bottom surface of the mating section (22) overlaps the top surface of the implant body (1). The restorative connection section (23) protrudes above the abutment connection cavity (11) and is used to support the restorative crown. The screw (3) includes a rod (31) and a head (32). The lower end of the rod (31) is provided with an external thread, and the top end of the head (32) is provided with a tool operating groove. The screw (3) passes through the abutment through hole (24). The external thread of the rod (31) is screwed into the implant internal thread section (112) and the abutment internal thread (26) to axially press and fix the abutment (2) into the implant body (1).

2. The cylindrical implant system according to claim 1, characterized in that, The base connecting cavity (11) is provided with a base mating section and a threaded connection section from top to bottom; the anti-rotation structure (111) is provided on the inner wall of the base mating section, and the implant internal thread section (112) is provided on the inner wall of the threaded connection section; the inner diameter of the base mating section is larger than the inner diameter of the threaded connection section, and a step surface is formed between the two, which is used to axially limit the bottom end of the insertion section (21) of the base (2).

3. The cylindrical implant system according to claim 1, characterized in that, The number of the setting slots (12) is two, three, four, five or six, and each of the setting slots (12) is evenly and symmetrically distributed along the circumference of the implant body (1). The axial length of the setting slot (12) is 1 / 4 to 1 / 2 of the total length of the implant body (1), and the width of the setting slot (12) is 0.3mm to 1.5mm. The setting slots (12) make the lower part of the implant body (1) form an elastically deformable flap structure. After the flap structure is implanted, it uses its own elastic recovery force to generate radial compression with the bone tissue to enhance the initial stability. and / or The slot can be a longitudinal slot, a transverse slot, or an oblique slot.

4. The cylindrical implant system according to claim 1, characterized in that, The abutment through hole (24) is a stepped hole that runs through the central axis of the abutment (2), and includes an upper large diameter section and a lower small diameter section from top to bottom; the upper large diameter section is used to accommodate the head (32) of the screw (3), and the inner wall of the lower small diameter section is provided with the abutment internal thread (26); the external thread of the shank (31) of the screw (3) is simultaneously screwed into the abutment internal thread (26) and the implant internal thread section (112), forming a double threaded locking connection between the screw (3), the abutment (2) and the implant body (1).

5. The cylindrical implant system according to claim 4, characterized in that, The pitch of the internal thread (26) of the abutment is the same as the pitch of the internal thread segment (112) of the implant; or, the pitch of the internal thread (26) of the abutment is slightly different from the pitch of the internal thread segment (112) of the implant, so that after the screw (3) is tightened, an axial interference preload is generated between the two, forming a differential pitch anti-loosening structure.

6. The cylindrical implant system according to claim 1, characterized in that, The outer wall of the implant body (1) is a smooth or rough cylindrical surface without external threads; the bottom end of the implant body (1) is provided with a tapered guide tip, the tapered guide tip has a cone angle of 30° to 120°, and its surface is provided with a self-tapping cutting edge, which is connected to the side wall edge of the set slot (12).

7. The cylindrical implant system according to claim 1, characterized in that, The restorative connecting section (23) has a frustum-shaped structure that is wider at the top and narrower at the bottom, with a taper of 3° to 10°. The central axis of the restorative connecting section (23) and the central axis of the insertion section (21) are offset by an angle of 0° to 25° to adapt to the direction of the insertion path for different tooth positions.

8. The cylindrical implant system according to claim 1, characterized in that, The rod body (31) includes a smooth rod section and a threaded rod section from top to bottom; a necking section is provided between the head (32) and the smooth rod section, the outer diameter of the necking section is smaller than the outer diameter of the head (32) and the smooth rod section, which is used to generate elastic tensile deformation when the screw (3) is tightened to provide continuous axial preload; the tool operating groove at the top of the head (32) is an internal hexagonal groove or an internal Torx groove.

9. The cylindrical implant system according to claim 1, characterized in that, The total axial length of the implant body (1) is 10mm to 20mm, and the outer diameter is 3.0mm to 6.0mm; The implant body (1) is available in various tooth position fitting specifications: Central incisor fitting specifications: axial total length 12mm~15mm, outer diameter 3.0mm~4.0mm; Lateral incisor fitting specifications: axial total length 11mm~14mm, outer diameter 3.0mm~3.5mm; Canine fitting specifications: axial total length 15mm~20mm, outer diameter 3.5mm~4.5mm; The first premolar fit specifications are as follows: axial total length is 12mm to 15mm, and outer diameter is 3.5mm to 4.5mm. The second premolar fit specifications are as follows: axial total length is 11mm to 14mm, and outer diameter is 3.5mm to 4.5mm. The first molar fitting specifications are as follows: axial total length is 12mm to 16mm, and outer diameter is 4.5mm to 6.0mm. The second molar fitting specifications are as follows: axial total length is 11mm to 15mm, and outer diameter is 4.5mm to 5.5mm.

10. A cylindrical implant, characterized in that, The implant body (1) is a hollow cylindrical sleeve structure with an axially arranged abutment connection cavity (11) for accommodating the abutment (2) and for threaded connection with a screw (3). The base connecting cavity (11) is provided with a base mating section and a threaded connecting section from top to bottom. The inner diameter of the base mating section is larger than the inner diameter of the threaded connecting section, and a stepped surface is formed between them. The inner wall of the base mating section is provided with an anti-rotation structure (111), which is at least a pair of symmetrically distributed planar cutting surfaces provided on the inner wall. The inner wall of the threaded connecting section is provided with an implant threaded section (112). The lower part of the outer wall of the implant body (1) is provided with at least two axially extending slots (12), which extend upward from the bottom of the implant body (1) by a predetermined length.

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