External fastening device for dental implant

Abstract

The utility model relates to an external fastening device for an implant tooth, and belongs to the technical field of oral implant teeth. The technical problems that a split type straight abutment is small in acting force area, and a split type structure is difficult to be placed in a tooth groove and complete rotary installation before being installed successfully exist in the prior art are solved. According to the scheme, the whole fastening main body is of a columnar structure; the fastening embedding part is arranged at the bottom of the fastening main body, an anti-rotation connecting structure is arranged in the fastening embedding part, and the anti-rotation connecting structure is used for being in anti-rotation connection with the outer side of an abutment anti-rotation part of an external abutment; the stress part is arranged at the top of the fastening main body and is used for being connected with an external wrench to obtain external torsion; wherein the fastening main body is provided with a penetrating through hole along the central axis of the fastening main body, the abutment connecting part is arranged in the penetrating through hole in a penetrating mode, and the abutment connecting part is used for being detachably connected with the abutment anti-rotation part in a threaded mode. According to the technical scheme, the split type straight abutment can be rapidly installed at a time, and the installation efficiency and effect of the split type straight abutment are improved.

Description

Technical Field

[0001] The utility model relates to a fastening device, in particular to an external fastening device for dental implants, and belongs to the technical field of oral dental implants. Background Art

[0002] With the continuous innovation of dental implant technology, more and more dental implant components are coming out. In order to better apply the new dental implant components, dental implant-related tools also need to be updated synchronously.

[0003] In the prior art, there is a technical solution for a split straight abutment. For example, the patent document with application number "CN202321624557.3" discloses a composite abutment, in which the split straight abutment includes an abutment body and an abutment connector, and a hexagonal tube is arranged on the abutment connector; the abutment body is mainly used to cooperate with the anti-rotation structure of the implant to achieve circumferential fixation, and the abutment fastener is threadedly connected to the implant to realize the installation of the split straight abutment.

[0004] The installation effect of this type of split straight abutment is better than that of the traditional straight abutment, and its market share has increased year by year. However, due to the operation in the oral cavity, the area where the split straight abutment can exert force is small, and the split structure is difficult to place in the tooth socket and complete the rotational installation before it is successfully installed. Therefore, how to better install the split straight abutment is a technical problem that needs to be solved by the existing technology.

[0005] The closest prior art is the patent document with application number "CN202220129496.2", which discloses a technical solution for a bone-level straight abutment fastening sleeve. However, it is unable to stably connect the split straight abutment, and the split straight abutment can easily fall out of the sleeve.

[0006] Therefore, how to provide an external fastening device for dental implants that can quickly install the split straight abutment in one go and improve the installation efficiency and installation effect of the split straight abutment is a technical problem that needs to be urgently solved by those skilled in the art. Utility Model Content

[0007] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to be able to quickly install the split straight abutment in one go, thereby improving the installation efficiency and installation effect of the split straight abutment.

[0008] According to the embodiment of the present utility model, there is provided an external fastening device for dental implants:

[0009] An external fastening device for dental implants, the device comprising: a fastening body, a fastening embedded part, a force-bearing part, and a base connecting part; the fastening body is a columnar structure as a whole; the fastening embedded part is arranged at the bottom of the fastening body, and an anti-rotation connection structure is arranged in the fastening embedded part, and the anti-rotation connection structure is used for anti-rotation connection with the outer side of the base anti-rotation part of the external base; the force-bearing part is arranged at the top of the fastening body, and the force-bearing part is used to connect with an external wrench to obtain external torque; wherein, the fastening body is provided with a through hole along its axis, the base connecting part is penetrated by the through hole, and the base connecting part is used for detachable threaded connection with the base anti-rotation part.

[0010] Furthermore, as a more preferred embodiment of the present invention, the internal cavity structure of the anti-rotation connection structure is in a first geometric shape; the first geometric shape is cylindrical, and there are two points on the side of the first geometric shape along the central axis with different distances from the central axis.

[0011] Furthermore, as a more preferred embodiment of the present invention, the first geometric shape is one of a prism, an elliptical cylinder, and a notched cylinder.

[0012] Furthermore, as a more preferred embodiment of the present invention, the first geometric shape is a regular prism.

[0013] Furthermore, as a more preferred embodiment of the present invention, the first geometric shape is a regular hexagonal prism.

[0014] Furthermore, as a more preferred embodiment of the present invention, the first geometric shape is a spiral prism.

[0015] Furthermore, as a more preferred embodiment of the present invention, a base accommodating cavity is provided at the bottom of the fastening embedded portion; the base accommodating cavity is connected to the anti-rotation connection structure; during operation, the base accommodating cavity cover is provided on the upper end of the external base, wherein the anti-rotation connection structure is nested and connected with the anti-rotation structure on the outside of the base anti-rotation portion.

[0016] Furthermore, as a more preferred embodiment of the present invention, on a plane perpendicular to the central axis of the fastening body, the projected size of the base accommodating cavity is larger than the projected size of the anti-rotation connection structure.

[0017] Furthermore, as a more preferred embodiment of the present invention, the base accommodating cavity is cylindrical or truncated cone-shaped.

[0018] Furthermore, as a more preferred embodiment of the present invention, the force-bearing part includes: a polygonal force-bearing structure and a ratchet force-bearing structure; the polygonal force-bearing structure and the ratchet force-bearing structure are sequentially arranged on the top of the fastening body; on a plane perpendicular to the central axis of the fastening body, the projected size of the polygonal force-bearing structure is smaller than the projected size of the ratchet force-bearing structure.

[0019] Furthermore, as a more preferred embodiment of the present invention, the device also includes: an elastic buffer ring; a first annular groove body is opened on the polygonal force-bearing structure; and the elastic buffer ring is nested in the first annular groove body.

[0020] Furthermore, as a more preferred embodiment of the present invention, the first annular groove body divides the polygonal force-bearing structure into an upper polygonal force-bearing section and a lower polygonal force-bearing section; the length of the upper polygonal force-bearing section is greater than the length of the lower polygonal force-bearing section.

[0021] Furthermore, as a more preferred embodiment of the present invention, the force-bearing part also includes: a first limiting part; the first limiting part is arranged on the side of the ratchet force-bearing structure away from the polygonal force-bearing structure; on the plane perpendicular to the central axis of the fastening body, the projected size of the ratchet force-bearing structure is smaller than the projected size of the first limiting part.

[0022] Furthermore, as a more preferred embodiment of the present invention, the cross-sectional shape of the first limiting portion perpendicular to the central axis of the fastening body is one of a circle, a polygon, and a star.

[0023] Furthermore, as a more preferred embodiment of the present invention, the base connection part includes: a connection body, a connection force applying head, and a connection head; the connection force applying head is arranged at one end of the connection body, and the connection force applying head is used to connect with an external force; the connection head is arranged at the other end of the connection body, and the connection head is used to be detachably threadedly connected to the base anti-rotation part.

[0024] Furthermore, as a more preferred embodiment of the present invention, a limiting structure is provided in the through hole; the connecting body is connected to the connecting head through an extension rod; the extension rod and the connecting head are used to pass through the inner hole of the limiting structure.

[0025] Furthermore, as a more preferred embodiment of the present invention, the connecting body and the through hole are clearance fit, the extension rod and the inner hole of the limiting structure are clearance fit; and an external thread structure is provided on the connecting head.

[0026] Furthermore, as a more preferred embodiment of the present invention, the inner hole of the limiting structure is provided with a limiting internal thread structure for threaded engagement with the connector.

[0027] Compared with the prior art, the present application provides a technical solution for an external fastening device for dental implants, in which the anti-rotation connection structure of the fastening embedded part is embedded circumferentially fixedly connected to the abutment anti-rotation part of the abutment fastener of the external abutment, and at the same time, the abutment connecting part is detachably threadedly connected to the abutment anti-rotation part through the through-hole, thereby realizing a detachable fixed connection to the external abutment, which is equivalent to the external fastening device for dental implants clamping the external abutment; further, the posture relationship of the external abutment is adjusted so that it can sit on the implant, that is, the anti-rotation structure at the bottom of the abutment body cooperates with the anti-rotation structure of the implant, and the external thread structure of the abutment fastener is aligned with the internal thread structure of the implant; further, the abutment fastener is tightened, that is, the abutment fastener is tightened by the fastening embedded part, so that the external abutment is fastened to the implant; finally, the abutment connecting part is unscrewed from the abutment anti-rotation part to realize the separation of the external fastening device for dental implants and the external abutment. It is important to note that the fastening process is seamless. First, the abutment connector allows the external dental implant fastening device to clamp the split straight abutment. After the split straight abutment is installed, the abutment connector allows the external dental implant fastening device to be detached from the external abutment, thereby improving the installation efficiency and stability of the split straight abutment. The technical solution provided by this application enables a one-time, rapid installation of the split straight abutment, improving its installation efficiency and effectiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a three-dimensional schematic diagram of the overall structure of the external fastening device for dental implants in an embodiment of the present utility model;

[0029] Figure 2 This is a cross-sectional view of the overall structure of the external fastening device for dental implants in an embodiment of the present utility model;

[0030] Figure 3 This is a cross-sectional view of the internal structure of the fastening body in an embodiment of the present utility model;

[0031] Figure 4 Schematic diagram of the three-dimensional structure of the base connecting portion in an embodiment of the present utility model;

[0032] Figure 5 This is a schematic diagram of the external structure of the fastening body in an embodiment of the present utility model;

[0033] Figure 6 It is a structural schematic diagram of the connection between the fastening body and the external base in an embodiment of the present utility model.

[0034] Reference numerals:

[0035] Fastening body 1; through hole 101; limiting structure 102; limiting internal thread structure 102a; fastening embedded portion 2; anti-rotation connection structure 201; base accommodating cavity 202; force-bearing portion 3; polygonal force-bearing structure 301; upper polygonal force-bearing section 301a; lower polygonal force-bearing section 301b; ratchet force-bearing structure 302; first annular groove 303; first limiting portion 304; base connecting portion 4; connecting body 401; connecting force applying head 402; connecting head 403; extension rod 404; elastic buffer ring 5;

[0036] External abutment A1; abutment fastener A2; abutment anti-rotation part A3. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of this application.

[0038] It should be noted that when an element is referred to as being “fixed on” or “set on” another element, it can be directly on the other element or indirectly set on the other element; when an element is referred to as being “connected to” another element, it can be directly connected to the other element or indirectly connected to the other element.

[0039] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" or "several" means two or more, unless otherwise specifically defined.

[0041] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the efficacy and purpose that can be achieved by this application.

[0042] This application proposes the following application plan.

[0043] like Figure 1-6 As shown, according to one embodiment of the present invention, an external fastening device for dental implants is provided:

[0044] An external fastening device for dental implants, the device comprising: a fastening body 1, a fastening embedded part 2, a force-bearing part 3, and a base connecting part 4; the fastening body 1 is a columnar structure as a whole; the fastening embedded part 2 is arranged at the bottom of the fastening body 1, and an anti-rotation connection structure 201 is arranged in the fastening embedded part 2, and the anti-rotation connection structure 201 is used for anti-rotation connection with the outer side of the abutment anti-rotation part A3 of the external abutment A1; the force-bearing part 3 is arranged at the top of the fastening body 1, and the force-bearing part 3 is used to connect with an external wrench to obtain external torque; wherein, the fastening body 1 is provided with a through hole 101 along its axis, and the base connecting part 4 is penetrated by the through hole 101, and the base connecting part 4 is used for detachable threaded connection with the abutment anti-rotation part A3.

[0045] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 6As shown, in this embodiment, the anti-rotation connection structure 201 of the fastening embedded part 2 is embedded in the circumferential fixed connection with the abutment anti-rotation part A3 of the abutment fastener A2 of the external abutment A1, and at the same time, the abutment connecting part 4 is detachably threadedly connected to the abutment anti-rotation part A3 through the through hole 101, thereby realizing a detachable fixed connection to the external abutment A1, which is equivalent to clamping the external abutment A1 with an external fastening device for dental implants; further, the posture relationship of the external abutment A1 is adjusted so that it can sit on the implant On the implant, that is, the anti-rotation structure at the bottom of the abutment body of the external abutment A1 is adjusted to cooperate with the anti-rotation structure of the implant, and the external thread structure of the abutment fastener A2 is aligned with the internal thread structure of the implant; further, the abutment fastener A2 is tightened, that is, the abutment fastener A2 is tightened by the fastening embedding part 2, so that the external abutment A1 is firmly connected to the implant; finally, the abutment connecting part 4 is unscrewed from the abutment anti-rotation part A3 to realize the separation of the external fastening device for dental implants and the external abutment A1. It should be emphasized that the tightening process is completed in one go. First, the external fastening device for dental implants is clamped to the split straight abutment through the action of the abutment connecting part 4. After the split straight abutment is installed, the external fastening device for dental implants is separated from the external abutment A1 through the abutment connecting part 4, thereby improving the installation efficiency and installation stability of the split straight abutment. The embodiments provided in the present application can perform a one-time quick installation of the split straight abutment, thereby improving the installation efficiency and installation effect of the split straight abutment.

[0046] It should be noted that in the present application, the "split straight base" is an external environmental feature of the present application, not a technical feature of the present application.

[0047] It should be noted that the "external abutment A1" mentioned in the present application can be a split straight abutment as well as an angled abutment, that is, the external fastening device for dental implants recorded in the present application can be used for abutments that have a connection structure that cooperates with the "anti-rotation connection structure 201" and the "connecting head 403" in addition to being able to be used for split straight abutments.

[0048] Specifically, in an embodiment of the present invention, the internal cavity structure of the anti-rotation connection structure 201 is in a first geometric shape; the first geometric shape is cylindrical, and there are two points on the side of the first geometric shape along the central axis with different distances from the central axis.

[0049] Specifically, in an embodiment of the present invention, the first geometric shape is one of a prism, an elliptical cylinder, and a notched cylinder.

[0050] Specifically, in an embodiment of the present invention, the first geometric shape is a regular prism.

[0051] Specifically, in an embodiment of the present invention, the first geometric shape is a regular hexagonal prism.

[0052] Specifically, in an embodiment of the present invention, the first geometric shape is a spiral prism.

[0053] like Figure 3 As shown, it should be noted that the embodiments of the anti-rotation connection structure 201 are all used to control the circumferential rotation of the connected objects to achieve the purpose of anti-rotation.

[0054] To elaborate specifically, in an embodiment of the present invention, a base accommodating cavity 202 is provided at the bottom of the fastening embedded portion 2; the base accommodating cavity 202 is communicated with the anti-rotation connection structure 201; during operation, the base accommodating cavity 202 is covered on the upper end of the external base A1, wherein the anti-rotation connection structure 201 is nested and connected with the anti-rotation structure on the outside of the base anti-rotation portion A3.

[0055] like Figure 3 、 Figure 6 As shown, it should be noted that the fastening embedded part 2 can be covered on the upper end of the external base A1 through the base accommodating cavity 202, which can ensure the stable connection between the anti-rotation connection structure 201 and the base anti-rotation part A3 and improve the connection stability.

[0056] Specifically, in an embodiment of the present invention, on a plane perpendicular to the central axis of the fastening body 1 , the projected size of the base accommodating cavity 202 is larger than the projected size of the anti-rotation connection structure 201 .

[0057] like Figure 3 、 Figure 6 As shown, it should be noted that this embodiment can ensure that the base accommodating cavity 202 can better cover the upper end of the external base A1, thereby improving the connection stability.

[0058] Specifically, in the embodiment of the present invention, the base accommodating cavity 202 is cylindrical or truncated cone-shaped.

[0059] To elaborate specifically, in an embodiment of the present utility model, the force-bearing part 3 includes: a polygonal force-bearing structure 301 and a ratchet force-bearing structure 302; the polygonal force-bearing structure 301 and the ratchet force-bearing structure 302 are sequentially arranged on the top of the fastening body 1; on a plane perpendicular to the central axis of the fastening body 1, the projection size of the polygonal force-bearing structure 301 is smaller than the projection size of the ratchet force-bearing structure 302.

[0060] like Figure 5As shown, it should be noted that the polygonal force-bearing structure 301 of the fastening body 1 is used to connect with a square wrench, while the ratchet force-bearing structure is used to connect with a ratchet wrench. These two types of wrenches are commonly used in oral implant treatment. By combining the two structures, it is possible to adapt to two different external wrenches, such as a square wrench or a ratchet wrench. When the external abutment A1 needs to be fixed or rotated, there is no need to replace the external fastening device for dental implants to meet the needs of using different external wrenches in different procedures.

[0061] Specifically, in an embodiment of the present utility model, the device further includes: an elastic buffer ring 5 ; a first annular groove 303 is provided on the polygonal force-bearing structure 301 ; and the elastic buffer ring 5 is nested in the first annular groove 303 .

[0062] like Figure 2 As shown, it should be noted that by adding the elastic buffer ring 5, the hard collision between the external wrench and the external fastening device for dental implants during the process of moving in and out when adjusting the position and angle can be reduced, thereby reducing the vibration of the patient's jaw and improving comfort.

[0063] To be specific, in an embodiment of the present utility model, the first annular groove body 303 divides the polygonal force-bearing structure 301 into an upper polygonal force-bearing section 301a and a lower polygonal force-bearing section 301b; the length of the upper polygonal force-bearing section 301a is greater than the length of the lower polygonal force-bearing section 301b.

[0064] like Figure 5 As shown, it should be noted that when the external fastening device for dental implants is just beginning to tighten the external abutment A1 or is about to loosen the external abutment A1, since the external abutment A1 and the implant are relatively loose, the square wrench can be used only with the upper polygonal force-bearing section 301a to quickly rotate the external fastening device for dental implants. Only when the external abutment A1 and the implant are relatively tight is the square wrench used in conjunction with the upper polygonal force-bearing section 301a, the elastic buffer ring 5, and the lower polygonal force-bearing section 301b. The elastic buffer ring 5 reduces the vibration of the square wrench on the external fastening device for dental implants, thereby reducing discomfort. In this way, the external wrench's position of action can be adjusted according to needs, achieving force application at different locations.

[0065] To elaborate specifically, in an embodiment of the present utility model, the force-bearing part 3 also includes: a first limiting part 304; the first limiting part 304 is arranged on the side of the ratchet force-bearing structure 302 away from the polygonal force-bearing structure 301; on a plane perpendicular to the central axis of the fastening body 1, the projection size of the ratchet force-bearing structure 302 is smaller than the projection size of the first limiting part 304.

[0066] like Figure 5 As shown, it should be noted that the fastening body 1, through the first limiting portion 304 of the force-bearing portion 3, can prevent the ratchet wrench from falling out to the gum side during use during the cooperation between the ratchet wrench and the ratchet force-bearing structure 302, thereby preventing the gums from being injured or touching other teeth and generating vibrations.

[0067] Specifically, in the embodiment of the present invention, the cross-sectional shape of the first limiting portion 304 perpendicular to the central axis of the fastening body 1 is one of a circle, a polygon, and a star.

[0068] It should be noted that this embodiment can have different shapes according to actual application conditions to improve product recognition.

[0069] To elaborate specifically, in an embodiment of the present utility model, the base connection part 4 includes: a connection body 401, a connection force head 402, and a connection head 403; the connection force head 402 is arranged at one end of the connection body 401, and the connection force head 402 is used to connect with an external force; the connection head 403 is arranged at the other end of the connection body 401, and the connection head 403 is used to be detachably threadedly connected to the base anti-rotation part A3.

[0070] like Figure 3 、 Figure 4 As shown, it should be noted that the base connection part 4 can be divided into three parts as a whole: a connection body 401, a connection force head 402, and a connection head 403; after the base connection part 4 is inserted into the through hole 101, the connection head 403 is rotated by rotating the connection force head 402, and the connection head 403 first rotates to engage with the limiting internal thread structure 102a, continues to rotate through the limiting internal thread structure 102a, and then enters the anti-rotation connection structure 201 and the base accommodating cavity 202, and finally can realize a detachable threaded connection with the base anti-rotation part A3, thereby improving the connection stability.

[0071] To be specific, in an embodiment of the present invention, a limiting structure 102 is provided in the through hole 101; the connecting body 401 is connected to the connecting head 403 through an extension rod 404; the extension rod 404 and the connecting head 403 are used to pass through the inner hole of the limiting structure 102.

[0072] Specifically, in the embodiment of the present invention, the connecting body 401 and the through hole 101 are clearance-fitted, and the extension rod 404 and the inner hole of the limiting structure 102 are clearance-fitted; and the connecting head 403 is provided with an external thread structure.

[0073] like Figure 2 、 Figure 3 、 Figure 4As shown, it should be noted that the looseness of the base connection part 4 relative to the fastening body 1 can be reduced by the clearance fit connection method, thereby improving the stability and accuracy during use.

[0074] Specifically, in the embodiment of the present invention, the inner hole of the limiting structure 102 is provided with a limiting internal thread structure 102 a for threaded engagement with the connecting head 403 .

[0075] like Figure 2 、 Figure 3 、 Figure 4 As shown, it should be noted that the limiting internal thread structure 102a is threadedly matched with the external thread structure of the connecting head 403; the limiting internal thread structure 102a of the limiting structure 102 has the effect of preventing the base connection part 4 from escaping from the through hole 101, that is, it has the technical effect of preventing the external base A1 from directly escaping from the external fastening device for dental implants.

[0076] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An external fastening device for dental implants, characterized in that: The device includes: A fastening body (1), a fastening embedded portion (2), a force-bearing portion (3), and a base connecting portion (4); The fastening body (1) is a columnar structure as a whole; The fastening embedded portion (2) is arranged at the bottom of the fastening main body (1), and an anti-rotation connection structure (201) is arranged in the fastening embedded portion (2), and the anti-rotation connection structure (201) is used for anti-rotation connection with the outer side of the base anti-rotation portion (A3) of the external base (A1); The force-bearing portion (3) is arranged on the top of the fastening body (1), and the force-bearing portion (3) is used to connect with an external wrench to obtain external torque; The fastening body (1) is provided with a through hole (101) along its central axis. The base connection portion (4) is provided through the through hole (101), and the base connection portion (4) is used for detachable threaded connection with the base anti-rotation portion (A3).

2. The external fastening device for dental implants according to claim 1, characterized in that: The internal cavity structure of the anti-rotation connection structure (201) is in a first geometric shape; the first geometric shape is columnar, and two points with different distances from the central axis exist on the side surface of the first geometric shape along the central axis.

3. The external fastening device for dental implants according to claim 2, characterized in that: A base accommodating cavity (202) is provided at the bottom of the fastening embedded portion (2); The base accommodating cavity (202) is in communication with the anti-rotation connection structure (201); During operation, the base accommodating cavity (202) is covered on the upper end of the external base (A1), wherein the anti-rotation connection structure (201) is nested and connected with the anti-rotation structure outside the base anti-rotation portion (A3); On a plane perpendicular to the central axis of the fastening body (1), the projected size of the base accommodating cavity (202) is larger than the projected size of the anti-rotation connection structure (201); The base accommodating cavity (202) is cylindrical or truncated cone-shaped.

4. The external fastening device for dental implants according to claim 1, characterized in that: The force-bearing portion (3) comprises: A polygonal force-bearing structure (301), a ratchet force-bearing structure (302); The polygonal force-bearing structure (301) and the ratchet force-bearing structure (302) are sequentially arranged on the top of the fastening body (1).

5. The external fastening device for dental implants according to claim 4, characterized in that: On a plane perpendicular to the central axis of the fastening body (1), the projected size of the polygonal force-bearing structure (301) is smaller than the projected size of the ratchet force-bearing structure (302); The device also includes: an elastic buffer ring (5); The polygonal force-bearing structure (301) is provided with a first annular groove (303); The elastic buffer ring (5) is nested in the first annular groove (303); The first annular groove (303) divides the polygonal force-bearing structure (301) into an upper polygonal force-bearing section (301a) and a lower polygonal force-bearing section (301b); The length of the upper polygonal force-bearing section (301a) is greater than the length of the lower polygonal force-bearing section (301b).

6. The external fastening device for dental implants according to claim 4, characterized in that: The force-bearing portion (3) further includes: a first limiting portion (304); The first limiting portion (304) is arranged on a side of the ratchet force-bearing structure (302) away from the polygonal force-bearing structure (301); On a plane perpendicular to the central axis of the fastening body (1), the projection size of the ratchet force-bearing structure (302) is smaller than the projection size of the first limiting portion (304).

7. The external fastening device for dental implants according to claim 6, characterized in that: The cross-sectional shape of the first limiting portion (304) perpendicular to the central axis of the fastening body (1) is one of a circle, a polygon, and a star.

8. The external fastening device for dental implants according to claim 1, characterized in that: The base connecting portion (4) comprises: Connecting the main body (401), the force applying head (402), and the connecting head (403); The connecting force applying head (402) is provided at one end of the connecting body (401), and the connecting force applying head (402) is used for connecting with an external force; The connecting head (403) is arranged at the other end of the connecting body (401), and the connecting head (403) is used for detachable threaded connection with the anti-rotation part (A3) of the base.

9. The external fastening device for dental implants according to claim 8, characterized in that: A limiting structure (102) is provided in the through hole (101); The connecting body (401) is connected to the connecting head (403) via an extension rod (404); The extension rod (404) and the connector (403) are used to pass through the inner hole of the limiting structure (102); The connecting body (401) and the through hole (101) are in clearance fit, and the extension rod (404) and the inner hole of the limiting structure (102) are in clearance fit; an external thread structure is provided on the connecting head (403).

10. The external fastening device for dental implants according to claim 9, characterized in that: The inner hole of the limiting structure (102) is provided with a limiting internal thread structure (102a) for threaded engagement with the connector (403).

Images