Central screw for dental implant system

Abstract

The utility model relates to the technical field of dental implant, in particular to a central screw for a dental implant system, the central screw comprises a head part, a rod part and a thread part which are sequentially connected from top to bottom along the axis direction, and the head part and the rod part are respectively composed of a core body and a shell surrounding the outside of the core body along the circumferential direction of the core body; the shell is made of engineering plastics. The central screw can be suitable for a dental implant system made of a zirconium oxide material, and has a relatively small size under the condition of meeting the strength requirement.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of dental implants, in particular to a central screw for dental implant system. BACKGROUND

[0002] Dental implant technology, as an important progress in modern dentistry, provides an effective solution for many edentulous patients to restore masticatory function and aesthetic smile. The core is to implant the implant firmly into the alveolar bone through precise surgery, and to build a complete superstructure including abutment, central screw and restoration (such as crown) on this basis. The success of this technology not only depends on precise surgical operation, but also is closely related to the performance of the materials used. Traditionally, dental implant systems mainly use metal titanium materials because of their good biocompatibility and sufficient mechanical strength. However, with the progress of material science and the improvement of patients' aesthetic needs, zirconia materials gradually emerge. Zirconia has become the preferred material to replace titanium due to its high hardness, good biocompatibility and aesthetic appearance. However, the brittleness and high sensitivity to defects of zirconia make it prone to fracture when subjected to a large external force, which poses a challenge to the stability and durability of the dental implant system.

[0003] In particular, when connecting the implant and the abutment, although the traditional metal titanium central screw has sufficient strength, it may cause loosening or cracking at the connection due to the differences in thermal expansion coefficient and mechanical properties between titanium and zirconia. In order to solve this problem, researchers have begun to explore the possibility of using other materials to make central screws. Gold and carbon fiber composite materials are among them, each with unique advantages, such as the ductility of gold and the lightweight high strength of carbon fiber composite materials. However, these materials, while meeting the strength requirements, often result in a larger size of the central screw, thereby increasing the volume of the entire dental implant system and affecting the comfort and aesthetics of the patient. Therefore, there is an urgent need for a new type of central screw that can meet the good matching with zirconia materials and maintain a smaller volume and sufficient strength. CONTENT OF THE INVENTION

[0004] The purpose of the present application is to provide a central screw for dental implant system, which can solve the problems existing in the prior art.

[0005] The embodiments of the present application can be implemented by the following technical solutions:

[0006] A central screw for dental implant system, comprising a head, a rod and a thread part connected in sequence from top to bottom along the axial direction, the head and the rod are both composed of a core and an outer shell wrapped around the outside of the core in the circumferential direction; the outer shell is made of engineering plastic.

[0007] Further, the engineering plastic is one of PET, POM, PEEK or nylon.

[0008] Further, the core is made of any one of nickel-chromium alloy, cobalt-chromium alloy, titanium alloy or pure titanium.

[0009] Further, the shell is connected to the outside of the core in a coaxial manner, and the thickness of the shell is uniform.

[0010] Further, the core and the shell are connected by injection molding.

[0011] Further, the core further comprises a plurality of limiting protrusions arranged on the outer wall of the core.

[0012] Further, the core further comprises a connecting groove arranged in the interior of the core, and the opening of the connecting groove is located on the top surface of the core. The radial profile of the connecting groove is any one of triangle, quadrilateral, hexagon or hexagonal plum blossom.

[0013] Further, the outer diameter of the head is larger than the outer diameter of the rod, and the outer diameter of the rod is consistent with the outer diameter of the threaded portion.

[0014] Further, the threaded portion is made of the same material as the core.

[0015] The central screw for dental implant system provided by the embodiment of the present application has at least the following beneficial effects: the central screw is composed of a composite structure of a metal core in the interior and an engineering plastic in the exterior. The metal provides sufficient strength, and the engineering plastic in the exterior is closely combined with the zirconia material, which can reduce the abrasion of the zirconia material, reduce the risk of fracture, and the central screw can have a smaller size while meeting the strength requirement. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the central screw of the embodiment of the present application;

[0017] Figure 2 It is an exploded schematic diagram of the overall structure of the central screw of the embodiment of the present application;

[0018] Figure 3 It is a schematic diagram of the internal structure of the central screw of the embodiment of the present application;

[0019] Figure 4 It is a schematic diagram of the partial cross-section of the central screw of the embodiment of the present application;

[0020] Figure 5 It is Figure 4 a schematic diagram of the cross-section in the direction of E-E;

[0021] Figure 6 The overall structure of the implant system applied to the central screw of the embodiment of the present application is shown in the exploded view;

[0022] Figure 7 The overall structure of the implant system applied to the central screw of the embodiment of the present application is shown in the cross-sectional view;

[0023] Figure 8 The overall structure of the implant system applied to the central screw of the embodiment of the present application is shown in the cross-sectional view;

[0024] Figure 9 The overall structure of the implant system applied to the central screw of the embodiment of the present application is shown in the cross-sectional view;

[0025] Reference numerals in the drawings

[0026] Central screw 1, head 11, rod 12, threaded part, core 14, connecting groove 141, shell 15, limiting protrusion 16, abutment 2, crown connecting section 21, transgingival section 22, first connecting protrusion 23, first through hole 25, second through hole 26, implant 3, first cavity 31, second cavity 32; DETAILED DESCRIPTION

[0027] Hereinafter, the present application will be further described based on the preferred embodiments and with reference to the drawings.

[0028] In addition, for the convenience of understanding, various components on the drawings are enlarged or reduced, but this practice is not intended to limit the protection scope of the present application.

[0029] The singular form also includes the plural meaning, and vice versa.

[0030] In the description of the embodiments of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the embodiments of the present application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, in the description of the present application, in order to distinguish different units, the first, second and the like are used in the specification, but these are not limited by the order of manufacture, and cannot be understood as indicating or implying relative importance, and the name may be different in the detailed description and claims of the present application.

[0031] The words in the specification are used to illustrate the embodiments of the present application, but are not intended to limit the present application. It should be noted that, unless otherwise specified and limited, if the terms "arranged", "connected", "linked" appear, they should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, can be directly connected, or indirectly connected through an intermediate medium, can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood specifically.

[0032] In order to better illustrate the technical solutions of the present application, Figures 6 to 9 The present application provides a central screw, which can be applied to the above-mentioned dental implant system, especially to the dental implant system in which the abutment 2 and the implant 3 are both made of zirconia material. Specifically, in combination with

[0033] In use, the first connecting protrusion 23 of the abutment 2 is clamped in the first through hole 25 of the implant 3, the head of the central screw 1 is clamped in the first through hole 25 of the abutment 2, the threaded part of the central screw 1 passes through the second through hole 26 of the abutment 2 and the first cavity 31 of the implant 3 in sequence, and is connected with the internal thread of the second cavity 32, so as to finally realize the connection between the abutment 2 and the implant 3.

[0034] The present application provides a central screw, which can be applied to the above-mentioned dental implant system, especially to the dental implant system in which the abutment 2 and the implant 3 are both made of zirconia material. Specifically, in combination with Figures 1 to 6 The central screw 1 provided by the embodiments of the present application includes a head 11, a rod part 12 and a threaded part 13 connected in sequence along the axial direction, that is, the upper and lower ends of the rod part 12 are connected with the head 11 and the threaded part 13 respectively; wherein the head 11 and the rod part 12 are composed of a core 14 and an outer shell 15 arranged in sequence along the radial direction, that is, the core 14 and the outer shell 15 are coaxially arranged, and the outer shell 15 is wrapped outside the core 14 along the circumference of the core 14, so that the outer wall of the core 14 is connected with the inner wall of the outer shell 15;

[0035] The material of the core 14 can be titanium alloy, pure titanium, nickel-chromium alloy or cobalt-chromium alloy, which provides support to the central screw by the above-mentioned high-hardness metal material, so as to strengthen the overall strength of the central screw.

[0036] The material of the shell 15 can be engineering plastics such as PET, POM, PEEK, nylon, etc. On the one hand, the above-mentioned engineering plastics have good toughness and can maintain integrity under strong force, reducing the risk of breakage. On the other hand, the engineering plastics can reduce the wear of the zirconium oxide material when in contact with the zirconium oxide material, compared with metal materials.

[0037] Further, the outer side surface of the core 14 and the inner side surface of the shell 15 are tightly connected by injection molding.

[0038] In some preferred embodiments, the core 14 further comprises a plurality of limiting protrusions 16 provided on the outer wall of the core 14, which are used to further enhance the connection between the core 14 and the shell 15, and prevent the relative rotation of the core 14 and the shell 15 in the circumferential direction due to the application of torsion force during use.

[0039] Further, the core 14 is further provided with a connecting groove 141, the opening of which is located on the top surface of the core 14. The connecting groove 141 is used to cooperate with a screwdriver or other tools that are adapted thereto, and force is applied to the connecting groove 141 by the tool to realize the screwing in or out of the central screw 1. In some specific embodiments, the radial profile of the connecting groove 141 can be a regular polygon such as a triangle, a quadrilateral, a hexagon, etc. In addition, the radial profile of the connecting groove 141 can also be a hexagonal plum blossom shape.

[0040] Further, the outer diameter of the head 11 is greater than the outer diameter of the rod 12, which is used to cooperate with the stepped through hole in the abutment 2 to be clamped with each other, that is, the outer diameter of the head 11 cooperates with the first through hole 25 of the abutment 2, and the outer diameter of the rod 12 cooperates with the second through hole 26 of the abutment 2. Further, the outer diameter of the rod 12 is consistent with the outer diameter of the threaded portion 13, which ensures that the screw is uniformly stressed during connection, thereby improving the reliability and stability of the connection.

[0041] Further, the outer wall of the threaded portion 13 is provided with threads for cooperating with the internal threads of the implant 3 to be connected. Further, the material of the threaded portion 13 is the same as that of the core 14, and the core 14 and the threaded portion 13 can be prepared by one-piece molding.

[0042] The specific implementation ways of the present application are described in detail above, and for the person skilled in the art, some improvements and modifications can be made to the present application without departing from the principles of the present application, and these improvements and modifications also belong to the protection scope of the claims of the present application.

Claims

1. A central screw for a dental implant system, comprising a head (11), a shank (12), and a threaded portion (13) connected sequentially from top to bottom along an axial direction, characterized in that: The head (11) and the rod (12) are both composed of a core (14) and a shell (15) that surrounds the core (14) circumferentially. The outer shell (15) is made of engineering plastic.

2. The central screw according to claim 1, characterized in that, The engineering plastic is one of PET, POM, PEEK or nylon.

3. The central screw according to claim 2, characterized in that, The core (14) is made of any one of the following materials: nickel-chromium alloy, cobalt-chromium alloy, titanium alloy, or pure titanium.

4. The central screw according to claim 1, characterized in that, The outer shell (15) is coaxially connected to the outside of the core (14), and the thickness of the outer shell (15) is uniform throughout.

5. The central screw according to claim 1, characterized in that, The core (14) and the outer shell (15) are connected by injection molding.

6. The central screw according to claim 5, characterized in that, The core (14) also includes several limiting protrusions (16), which are provided on the outer wall of the core (14).

7. The central screw according to claim 1, characterized in that, The core (14) also includes a connecting groove (141), which is located inside the core (14). The opening of the connecting groove (141) is located on the top surface of the core (14), and the radial profile of the connecting groove (141) is a regular polygon or a hexagonal clover shape.

8. The central screw according to claim 1, characterized in that, The outer diameter of the head (11) is larger than the outer diameter of the rod (12), and the outer diameter of the rod (12) is the same as the outer diameter of the threaded part (13).

9. The central screw according to claim 1, characterized in that, The material used to prepare the threaded portion (13) is the same as the material used to prepare the core (14).

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