Dental implant cover screw

Abstract

The utility model relates to oral implant technology field, specifically disclose tooth implant covering screw. The screw includes screw body, connecting body and clamping unit, the screw body is embedded in the implant, the connecting body is fixedly connected with the screw head of screw body, the screw rod of screw body is divided into the both ends of screw head of screw body with connecting body, the one end of connecting body is fixedly connected with clamping unit, in the plane perpendicular to the screw rod of screw body, the projection of clamping unit covers the projection of connecting body, the screw mouth is recessed in clamping unit, clamping unit includes crown side platform and a plurality of bendable pieces, crown side platform is fixedly connected with connecting body, all bendable pieces are distributed along the circumference of crown side platform, bendable piece includes radial part and circumferential part, radial part extends along crown side platform radially, one end of radial part is fixedly connected with the side of crown side platform, the other end is fixedly connected with circumferential part, and circumferential part extends along crown side platform circumferentially. The screw improves the success rate of implant repair through the structure improvement.

Description

Technical Field

[0001] This utility model relates to the field of dental implant technology, and in particular to dental implant cover screws. Background Technology

[0002] Dental implant technology has become one of the main treatment methods for patients with missing teeth in modern oral restoration. This technique involves inserting a dental implant into the jawbone. After a healing period of several months, the implant integrates with the surrounding bone tissue, providing stable support for the superimposed restoration. The success of osseointegration hinges on the stability of the implant during the healing process. Clinical studies have shown that if the implant experiences micromovements exceeding 150 micrometers during healing, it can interfere with bone growth, leading to fibrous encapsulation rather than osseointegration, ultimately resulting in implant loosening and restoration failure.

[0003] To ensure stability during the healing process, implants must achieve sufficient initial stability upon placement, which typically relies on close contact or compression between the implant and the jawbone. However, in clinical practice, insufficient jawbone volume is frequently encountered, such as alveolar ridge atrophy, bone defects caused by trauma or disease, which significantly reduces the initial stability of the implant. For implants with insufficient stability, the standard approach is to use cover screws to connect to the implant platform for embedded healing, i.e., suturing soft tissue to cover the implant and prevent it from being exposed to the oral environment, aiming to reduce external loads and the risk of micromovement.

[0004] Currently, commonly available implant cover screws have significant limitations. These cover screws typically have a diameter less than or equal to the implant platform diameter, and their function is limited to sealing part of the threaded channel within the implant to prevent soft tissue ingrowth, but they cannot provide additional mechanical fixation. When the bone support around the implant is weak, these cover screws cannot effectively suppress micromovement, especially under functional loads or soft tissue activity, where micromovement may exceed a critical value, leading to osseointegration failure. Furthermore, when there is bone defect around the implant, bone augmentation techniques are often required to reconstruct bone volume. Existing cover screws, due to their small diameter and rigid structure, cannot effectively cover and fix the bone augmentation material, making the bone material prone to displacement or resorption during the healing period, affecting osseointegration and long-term success rates. Utility Model Content

[0005] The purpose of this invention is to provide a dental implant cover screw to improve the success rate of implant restoration.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A dental implant cover screw, detachably connected to the implant, comprises a screw body, a connector, and a retaining unit. The screw body is screwed into the implant. The connector is fixed to the screw head of the screw body, with the screw shank of the screw body and the connector located at opposite ends of the screw head. The retaining unit is fixed to the end of the connector away from the screw body. In a plane perpendicular to the screw shank of the screw body, the projection of the retaining unit overlaps the projection of the connector. The end of the retaining unit away from the screw body has a recessed screw opening. The retaining unit includes a coronal platform and several bendable pieces. The coronal platform is fixed to the connector. All the bendable pieces are evenly spaced along the circumference of the coronal platform. Each bendable piece includes a radial portion and a circumferential portion. The radial portion extends radially along the coronal platform, with one end fixed to the side of the coronal platform and the other end fixed to the circumferential portion, which extends circumferentially along the coronal platform.

[0008] As an optional technical solution for dental implant cover screws, the thickness of the bendable piece is the same throughout.

[0009] As an alternative technical solution for dental implant cover screws, the width of the radial portion gradually increases in the radial direction away from the coronal platform.

[0010] As an optional technical solution for dental implant cover screws, the bendable piece is L-shaped, with the horizontal part of the bendable piece being the radial part and the vertical part of the bendable piece being the circumferential part.

[0011] As an optional technical solution for dental implant cover screws, the edges of the bendable piece are smoothly transitioned.

[0012] As an optional technical solution for dental implant cover screws, the projection of the coronal platform coincides with the projection of the connector in the plane perpendicular to the screw body.

[0013] As an optional technical solution for dental implant cover screws, the surface finish Ra of the connector is below 0.8 μm; and / or, the surface finish Ra of the retaining unit is below 0.8 μm.

[0014] As an optional technical solution for dental implant cover screws, the dental implant cover screw is integrally formed.

[0015] As an optional technical solution for dental implant cover screws, the dental implant cover screw is made of alloy metal.

[0016] As an optional technical solution for dental implant cover screws, the screw head is an internal hexagonal screw head, and the depth direction of the internal hexagonal screw head is the same as the length direction of the screw body.

[0017] The beneficial effects of this utility model are:

[0018] This implant cover screw is screwed to the implant via the screw body, ensuring a detachable connection and stable fixation, facilitating installation and removal, and improving the success rate of implant restoration. The connector is fixed to the screw head of the screw body, isolating the coronal plateau from the implant, avoiding direct contact and reducing stress concentration. Furthermore, the connector ensures the retaining unit is higher than the implant plateau, facilitating placement and protecting the underlying bone augmentation material. The projection of the retaining unit in a plane perpendicular to the screw covers the connector, expanding the coverage area and providing radial extension. The bendable design of the flexible plate allows it to be bent to conform to the bone surface around the implant, forming a retaining effect, assisting in fixing the implant to prevent micromovement, while simultaneously fixing the bone augmentation material around the implant, promoting osseointegration and improving bone augmentation results. The radial and circumferential design of the flexible plate allows for localized bending to adapt to uneven bone surfaces, improving adaptability. The screw head design allows for screw rotation using standard tools, simplifying operation. Simultaneously, the implant cover screw has a simple structure, is easy to manufacture, and its shape conforms to the space requirements after implant placement. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the dental implant cover screw provided in this embodiment of the utility model;

[0020] Figure 2 This is a top view of the dental implant cover screw provided in this embodiment of the utility model.

[0021] In the picture:

[0022] 1. Screw body; 2. Connector; 3. Crown platform; 4. Bendable piece; 41. Circumferential part; 42. Radial part; 5. Threaded end. Detailed Implementation

[0023] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0024] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Moreover, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0027] like Figure 1 and Figure 2As shown, this utility model provides a dental implant cover screw, which is detachably connected to the implant. The dental implant cover screw includes a screw body 1, a connecting body 2, and a retaining unit. The screw body 1 is screwed into the implant. The connecting body 2 is fixed to the screw head of the screw body 1, with the screw shank of the screw body 1 and the connecting body 2 located at opposite ends of the screw head of the screw body 1. The retaining unit is fixed to the end of the connecting body 2 away from the screw body 1. In a plane perpendicular to the screw shank of the screw body 1, the projection of the retaining unit covers the projection of the connecting body 2. The clamping unit has a recessed screw hole 5 at one end away from the screw body 1. The clamping unit includes a crown platform 3 and several bendable pieces 4. The crown platform 3 is fixed to the connecting body 2. All the bendable pieces 4 are evenly distributed along the circumference of the crown platform 3. The bendable pieces 4 include a radial part 42 and a circumferential part 41. The radial part 42 extends radially along the crown platform 3. One end of the radial part 42 is fixed to the side of the crown platform 3, and the other end of the radial part 42 is fixed to the circumferential part 41. The circumferential part 41 extends circumferentially along the crown platform 3.

[0028] The implant cover screw is screwed to the implant via the screw body 1, ensuring a detachable connection and stable fixation, facilitating installation and removal, and improving the success rate of implant restoration. The connector 2 is fixed to the screw head of the screw body 1, isolating the coronal platform 3 from the implant, avoiding direct contact and reducing stress concentration. Furthermore, the connector 2 ensures the retaining unit is higher than the implant platform, facilitating placement and protecting the underlying bone augmentation material. The projection of the retaining unit in a plane perpendicular to the screw covers the connector 2, expanding the coverage area and providing radial extension. The bendable design of the flexible piece 4 allows it to bend and conform to the bone surface around the implant, forming a retaining effect, assisting in fixing the implant to prevent micromovement, while simultaneously fixing the bone augmentation material around the implant, promoting osseointegration and improving bone augmentation results. The radial portion 42 and circumferential portion 41 of the flexible piece 4 allow for local bending to adapt to uneven bone surfaces, improving adaptability. The screw head 5 design allows for screw rotation using standard tools, simplifying operation. Simultaneously, the implant cover screw has a simple structure, is easy to manufacture, and its shape conforms to the space requirements after implant placement.

[0029] In this embodiment, the connector 2 has a height of 1 mm and a diameter equal to or slightly smaller than the neck diameter of the implant, and the bendable piece 4 has a thickness of 1 mm.

[0030] For example, the bendable piece 4 may have six, seven, or eight pieces.

[0031] In this embodiment, the thickness of the bendable piece 4 is the same everywhere.

[0032] The uniform thickness of the bendable piece 4 ensures even stress distribution during bending, avoiding localized stress concentration and making the bending process more consistent and controllable. This reduces the risk of breakage due to uneven stress during bending, improving the stability and lifespan of the dental implant cover screw. It also ensures stable shape after bending and facilitates precise bending during operation to better conform to irregular bone surfaces, thus enhancing the reliability of auxiliary fixation.

[0033] Furthermore, in the radial direction away from the crown platform 3, the width of the radial portion 42 gradually increases.

[0034] In the radial direction away from the coronal platform 3, the width of the radial portion 42 gradually increases, forming a trapezoidal structure. This increases the strength of the base of the bendable piece 4, preventing excessive deformation or breakage during bending. It also increases the contact area between the bendable piece 4 and the bone surface, enhancing the stability and support of the clamping effect, improving the coverage and fixation of the bone augmentation material, and reducing the risk of material displacement. At the same time, the narrower end portion maintains flexibility, allowing for more precise bending adjustments to better conform to the bone morphology around the implant.

[0035] In this embodiment, the bendable piece 4 is L-shaped, with the horizontal part of the bendable piece 4 being the radial part 42 and the vertical part of the bendable piece 4 being the circumferential part 41.

[0036] The bendable piece 4 is L-shaped, with the horizontal part serving as the radial part 42 to provide radial support and the vertical part serving as the circumferential part 41 to provide circumferential coverage. The bending point and coverage area are optimized. The L-shaped design makes bending easier to operate. The bendable piece 4 can adapt to the bone surface morphology in multiple directions, providing more comprehensive fixation force and improving the effect of auxiliary fixation of implants and bone augmentation materials.

[0037] For example, the edges of the bendable piece 4 are smoothly transitioned.

[0038] The rounded edges of the bendable piece 4 reduce sharp edges from causing mechanical irritation and damage to surrounding soft tissues, lower the risk of inflammation, and improve biocompatibility. Especially when in contact with the bone surface after bending, it avoids tissue cutting caused by sharp edges. The rounded edges also prevent tearing of the collagen membrane or bone augmentation material during bending or removal, promoting the healing process.

[0039] In this embodiment, the projection of the crown platform 3 coincides with the projection of the connecting body 2 in the plane perpendicular to the screw body 1.

[0040] In the plane perpendicular to the screw body 1, the projection of the coronal platform 3 coincides with the projection of the connector 2, ensuring that the coronal platform 3 is directly supported by the connector 2. This improves the overall structural stability, ensures a direct and uniform force transmission path, avoids uneven loading, and allows the dental implant cover screw to sit stably on the implant. This facilitates screwdriver operation through the screw hole 5, improving the convenience of installation and removal. This design prevents the coronal platform 3 from tilting or loosening under stress, ensuring accurate positioning of the dental implant cover screw and providing uniform protection for the underlying bone augmentation material.

[0041] In one embodiment of this example, the surface finish Ra of the connector 2 is less than 0.8 μm; and the surface finish Ra of the clamping unit is less than 0.8 μm.

[0042] The surface finish Ra of connector 2 and coronal platform 3 is below 0.8 μm, forming a highly smooth surface that reduces the risk of bacterial adhesion and plaque buildup, thus lowering the likelihood of infection and inflammation. The high-smoothness surface also facilitates cleaning, promotes soft tissue healing and integration, avoids irritation to surrounding tissues, and facilitates postoperative maintenance.

[0043] In another embodiment of this invention, only the surface finish Ra of the connector 2 is limited to be below 0.8 μm. In yet another embodiment of this invention, only the surface finish Ra of the clamping unit is limited to be below 0.8 μm.

[0044] In this embodiment, the dental implant covering screw is integrally molded.

[0045] The one-piece molding of dental implant cover screws eliminates gaps between components, enhancing overall structural strength and integrity, preventing loosening or breakage at the connection point, improving reliability during healing, and simplifying the manufacturing process while reducing production costs. Furthermore, one-piece molding reduces assembly errors and potential failure points, ensuring the dental implant cover screws are more durable during bending and fixation, preventing separation or failure during use.

[0046] For example, the material of the screw covering the dental implant is an alloy metal.

[0047] The dental implant cover screw is made of medical-grade alloy, which provides sufficient mechanical strength and toughness to withstand bending operations without fatigue fracture. It can withstand bending operations and stress in the oral environment, ensuring long-term stability while ensuring biocompatibility. It is suitable for short-term implantation and reduces rejection reactions.

[0048] In this embodiment, the screw opening 5 is an internal hexagonal screw opening, and the depth direction of the internal hexagonal screw opening is the same as the length direction of the screw body 1.

[0049] The screw head 5 is an internal hexagonal screw head, and its depth direction is the same as the length direction of the screw body 1. It is compatible with standard implant system tools, ensures effective torque transmission, prevents slippage, facilitates screwing in and out, achieves tight connection and disassembly, and improves the convenience of clinical operation.

[0050] Specifically, the standard implant system tools include a screwdriver, which is inserted into the screw head 5 to rotate the implant cover screw and tighten it onto the implant.

[0051] In this embodiment, the dental implant cover screw is for single use only, in order to avoid metal fatigue of the bendable piece 4 and accidental breakage.

[0052] For example, the diameter of the retaining unit is 3 mm larger than the diameter of the implant neck. This is to avoid affecting adjacent teeth or adjacent implants, maintaining a distance of at least 1.5 mm between the implant cover screw and the adjacent tooth. Combined with the standard of maintaining a distance of at least 3 mm between implants during surgery, it is ensured that the process of screwing in the implant cover screw after implant placement is not interfered with by adjacent teeth or adjacent implants.

[0053] After implantation of a dental implant into the jawbone, maintaining stability is crucial for osseointegration. At this stage, the bone surface around the implant neck plateau may be uneven, especially in cases of localized bone defects, necessitating bone augmentation. To address this, a dental implant cover screw is inserted through the collagen membrane and tightened to secure it to the implant, forming a coronal plateau 3 higher than the implant platform. A flexible flap 4 is then bent to conform to the bone surface surrounding the implant, thus protecting the underlying bone augmentation material.

[0054] When installing the implant cover screw, insert a screwdriver into the screw hole 5 and tighten the implant cover screw to connect the implant. After tightening, according to the actual height of the bone surface around the implant, use a pin holder clamp or other actions to bend the corresponding area of ​​the bendable piece 4 so that the bendable piece 4 makes slight contact with the bone surface to assist in implant fixation.

[0055] After the implant has achieved osseointegration, when it is necessary to replace the subsequent restorative parts, the flatness of the flexible plate 4 is restored by using a needle holder clamp and other actions, the implant cover screw is rotated in reverse, and the subsequent implant parts are replaced. If necessary, the flexible plate 4 can be cut or broken to facilitate the rotation of the implant cover screw.

[0056] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A dental implant cover screw, detachably connected to the implant, characterized in that, The dental implant overlay screw includes: The screw body (1) is screwed into the implant body; The connecting body (2) is fixed to the screw head of the screw body (1), and the screw rod of the screw body (1) and the connecting body (2) are located at the two ends of the screw head of the screw body (1); A clamping unit is fixed to one end of the connector (2) away from the screw body (1). In the plane perpendicular to the screw body (1), the projection of the clamping unit covers the projection of the connector (2). The end of the clamping unit away from the screw body (1) is recessed with a screw hole (5). The clamping unit includes a crown platform (3) and several bendable pieces (4). The crown platform (3) is fixed to the connector (2). All the bendable pieces (4) are evenly distributed along the circumferential distance of the crown platform (3). The bendable pieces (4) include a radial part (42) and a circumferential part (41). The radial part (42) extends radially along the crown platform (3). One end of the radial part (42) is fixed to the side of the crown platform (3). The other end of the radial part (42) is fixed to the circumferential part (41). The circumferential part (41) extends circumferentially along the crown platform (3).

2. The dental implant cover screw according to claim 1, characterized in that, The thickness of the bendable piece (4) is the same everywhere.

3. The dental implant cover screw according to claim 2, characterized in that, The width of the radial portion (42) gradually increases in the radial direction away from the crown platform (3).

4. The dental implant cover screw according to claim 1, characterized in that, The bendable piece (4) is L-shaped, with the horizontal part of the bendable piece (4) being the radial part (42) and the vertical part of the bendable piece (4) being the circumferential part (41).

5. The dental implant cover screw according to claim 1, characterized in that, The edges of the bendable piece (4) are smoothly transitioned.

6. The dental implant cover screw according to claim 1, characterized in that, In the plane perpendicular to the screw body (1), the projection of the crown platform (3) coincides with the projection of the connector (2).

7. The dental implant cover screw according to claim 1, characterized in that, The surface finish Ra of the connector (2) is below 0.8 μm; and / or, The surface finish Ra of the clamping unit is below 0.8 μm.

8. The dental implant cover screw according to claim 1, characterized in that, The dental implant cover screw is integrally molded.

9. The dental implant cover screw according to claim 1, characterized in that, The dental implant cover screw is made of alloy metal.

10. The dental implant cover screw according to any one of claims 1-9, characterized in that, The screw opening (5) is an internal hexagonal screw opening, and the depth direction of the internal hexagonal screw opening is the same as the length direction of the screw body (1).

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