Composite abutment for dental implant

Abstract

The utility model discloses a composite abutment for a dental implant, which comprises a threaded connection section, a conical matching section, a conical gingival soft tissue connection section and a dental crown connection end which are sequentially arranged on a coaxial line from bottom to top, and the top of the composite abutment is provided with an internal threaded connection hole of the coaxial line. The internal thread connecting hole extends downwards from the top surface of the dental crown connecting end to the middle lower part of the conical matching section, a kerf extending downwards in the axial direction to the middle lower part of the dental crown connecting end is formed in the top end of the dental crown connecting end, and the kerf penetrates through the inner wall and the outer wall of the dental crown connecting end in the radial direction; the kerfs are evenly distributed in the circumferential direction of the internal thread connecting hole. The composite abutment can be directly used for installation and connection of dental crowns, and the stability and reliability of connection can be ensured during connection.

Description

Technical Field

[0001] This utility model relates to the field of dental implant technology, and in particular to a composite abutment for dental implants. Background Technology

[0002] Dental implants generally consist of the implant body, abutment, and crown. The abutment connects both the implant and the crown, serving as a crucial link. Currently, the most common method for connecting the abutment and crown is through adhesive bonding. The crown is directly inserted onto the top of the abutment. During insertion, a professional dental adhesive is applied to the insertion point of the abutment. The bottom of the crown has a recess, the inner wall of which is also coated with dental adhesive. When bonding is required, the crown is inserted into the recess of the abutment, and the adhesive secures the crown to the abutment.

[0003] The above-mentioned adhesive bonding is called a full glue bonding in the industry. After bonding, there may be glue overflow, which needs to be cleaned up. However, glue residue may remain during the cleaning process. Residual glue can irritate the gums and cause inflammation.

[0004] To address the aforementioned issues and prevent the recurrence of gum inflammation caused by residual glue, a non-glued connection method has emerged in the industry. For example, Chinese invention patent application CN 114431987 A discloses a dental implant and its abutment. However, the abutment is not directly connected to the crown; instead, it is directly connected to a titanium base, on which the crown is mounted. Because the titanium base has a long threaded section for connecting to the crown, this denture fixation part can achieve a firm and reliable connection with the crown.

[0005] If this type of abutment can be used on a dental crown to directly connect with it, the problem of gingivitis caused by residual glue can be effectively solved. However, a new problem arises: the threaded hole on the top of the abutment is not deep. The denture needs to perform countless biting actions. How to maintain a stable and reliable connection with the denture after long-term use is a problem that the inventors of this application need to solve. Utility Model Content

[0006] To address the problem of gum inflammation caused by glue residue from all-glue connections, and to simultaneously adapt to direct connection with tooth crowns, promoting a stable and reliable connection, this invention proposes a novel composite abutment for dental implants.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a composite abutment for dental implants is provided, comprising a threaded connecting section, a tapered mating section, a tapered gingival soft tissue connecting section, and a crown connecting end arranged coaxially from bottom to top. The top of the composite abutment has a coaxial internal threaded connecting hole, which extends downward from the top surface of the crown connecting end to the lower middle part of the tapered mating section. The crown connecting end has a slit extending axially downward from its top to the lower middle part of the crown connecting end. The slit penetrates the inner and outer walls of the crown connecting end radially, and the slits are circumferentially distributed along the internal threaded connecting hole.

[0008] Preferably, the outer wall of the conical gingival soft tissue junction segment near the top surface of the conical gingival soft tissue junction segment is constructed as a cylindrical sidewall, and a slightly curved concave arc-shaped sidewall is constructed between the cylindrical sidewall and the outer conical sidewall of the conical gingival soft tissue junction segment below it.

[0009] Preferably, the top surface of the conical gingival soft tissue connecting segment protrudes radially from the bottom of the crown connecting end, and the radially protruding top surface is provided with radially arranged ridges, which are circumferentially distributed along the crown connecting end.

[0010] Preferably, the lower middle part of the crown connection end is formed with an axially arranged cutting wall, the cutting wall is circumferentially arranged along the crown connection end, the inner end of the convex ridge in the radial direction is connected to the connecting wall between two adjacent cutting walls, and the outer end of the convex ridge in the radial direction extends and leaves a gap between it and the top edge of the conical gingival soft tissue connection segment.

[0011] Preferably, the cut is constructed as a rectangular cut, the two opposite sidewalls of the rectangular cut are constructed as two oppositely inclined outward expansion walls in the upper middle part, and the rectangular cut forms an inwardly concave arc-shaped groove at the root.

[0012] Preferably, the axial length of the conical mating segment is greater than the axial length of the conical gingival soft tissue connection segment.

[0013] Preferably, the threaded connection section forms a conical positioning head at the bottom, and the positioning head has a flat bottom surface.

[0014] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0015] The composite abutment of this utility model can be directly connected to implants and crowns through the setting of threaded connecting section and crown connecting end. Moreover, the connection method does not require the use of glue. Through the external thread on the threaded connecting section and the internal thread of the internal thread connecting hole, a full threaded connection can be made directly by threaded connection, avoiding the glue residue caused by glue connection, which can lead to gingivitis.

[0016] The composite abutment of this invention, through the slits set on the composite abutment, enables the crown connection end to have elastic outward expansion capability during threaded connection. Thus, when the crown is screwed onto the composite abutment using an external screw, the external screw can compress the side wall of the internal threaded connection hole when screwed into it, causing the crown connection end to expand slightly radially outward. This radially outward expansion of the crown connection end tightly compresses the inner wall of the insertion hole at the bottom of the crown, while the internal threaded connection hole also extends downward to the lower middle part of the tapered mating section, thus sufficiently extending the threaded connection length. In summary, based on the original threaded connection, a firm and reliable connection between the composite abutment and the crown can be effectively achieved. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of a composite abutment for dental implants proposed in this utility model;

[0018] Figure 2 This is a schematic diagram of the main structure of a composite abutment for dental implants proposed in this utility model;

[0019] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0020] Figure 4 This is a cross-sectional schematic diagram of a composite abutment for dental implants proposed in this utility model.

[0021] The figure shows: threaded connection section 1, positioning head 11, conical mating section 2, conical gingival soft tissue connection section 3, cylindrical sidewall 31, outer conical sidewall 32, inner concave arc-shaped sidewall 33, crown connection end 4, cutting wall 41, connecting wall 42, internal threaded connection hole 5, cutting slit 6, outer expanding wall 61, arc-shaped groove 62, and convex ridge 7. Detailed Implementation

[0022] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0023] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0024] Given that existing methods of bonding abutments and crowns can lead to glue residue and cause gingivitis, this application provides a zero-degree composite abutment. This zero-degree composite abutment is connected to the crown using all screws. The external crown can be directly installed onto the zero-degree composite abutment using external connecting screws. Furthermore, the slit design ensures a firm and reliable connection between the zero-degree composite abutment and the external crown.

[0025] refer to Figures 1-4 This embodiment provides a composite abutment for dental implants. This composite abutment is a zero-degree composite abutment, made of titanium alloy (TC4ELI) and machined by a CNC machine tool. The surface is untreated and not sterilely packaged. It serves as a component for dental implants inserted into the jawbone after tooth loss. The term "zero-degree" can be understood as the composite abutment being vertically oriented without any bending.

[0026] Specifically, the composite abutment includes a threaded connecting section 1, a tapered mating section 2, a tapered gingival soft tissue connecting section 3, and a crown connecting end 4 arranged coaxially from bottom to top. The top of the composite abutment has a coaxial internal threaded connecting hole 5. The internal threaded connecting hole 5 extends downward from the top surface of the crown connecting end 4 to the lower middle part of the tapered mating section 2. The crown connecting end 4 has a slit 6 extending axially downward from the top to the lower middle part of the crown connecting end 4. The slit 6 penetrates the inner and outer walls of the crown connecting end 4 radially. The slit 6 is circumferentially distributed along the internal threaded connecting hole 5.

[0027] Understandably, the coaxial cable ensures that the composite abutment is vertical, without any bends, thus forming a zero-degree composite abutment. The threaded connection section 1 is located at the bottom and can be used for threaded connection with the external implant (not shown), meaning that the composite abutment can be threaded onto the external implant through the threaded connection section 1.

[0028] Unlike existing technologies, the composite abutment in this embodiment is further provided with a conical mating section 2. In this embodiment, the composite abutment is installed on the upper middle part of the external implant. The external implant is provided with a positioning mating hole (not shown) and a threaded hole (not shown) from top to bottom. The threaded connection section 1 is screwed into the threaded hole, and the conical mating section 2 is positioned and mated in the positioning mating hole after the threaded connection section 1 is screwed into place. It can be seen that the conical mating section 2 and the threaded connection section 1 are both located in the external implant and do not protrude from the external implant. This means that after the composite abutment is threadedly connected to the external implant, it will not immediately protrude from the external implant, but will be positioned in the positioning mating hole of the external implant through the conical mating section 2. In this way, the mating and positioning of the conical mating section 2 above the threaded connection section 1 with the positioning mating hole can block external impurities, and external impurities will not easily enter the threaded connection section 1 and the threaded hole of the external implant directly. It should be noted that the conical mating section 2 is conical in shape and relatively rounded, gradually decreasing in size from top to bottom. For positioning and fitting, compared to the uniformly small-diameter cylindrical structure in existing technologies, the conical mating section 2 fits more closely to the inner wall of the positioning hole after positioning and fitting. Furthermore, when the threaded connection section 1 is screwed in, it avoids the frictional heat generated by the outer wall of the cylindrical structure constantly contacting the inner wall of the positioning hole, which is also slower in existing technologies. In this embodiment, a gap is left between the outer wall of the conical mating section 2 and the inner wall of the positioning hole when the threaded connection section 1 is screwed in, thus preventing rapid frictional heat from constant contact and allowing for faster screwing. As for the conical gingival soft tissue connection section 3, which extends beyond the external implant and is located in the gingival layer, its conical shape also allows for good integration with the gingiva in the later stages.

[0029] In this embodiment, the crown connecting end 4 can be inserted and positioned with the insertion hole (not shown) at the bottom of the external crown (not shown). After insertion and positioning, the external crown is tightly connected to the composite abutment by screwing an external screw (not shown) into the internal threaded connecting hole 5. It should be noted that the top of the external crown has a hole (not shown) for the external screw to be inserted. As the external screw is screwed in, the external crown is tightly pressed onto the composite abutment, thereby achieving the connection between the external crown and the composite abutment. In this embodiment, because the internal threaded connecting hole 5 extends downward from the top surface of the crown connecting end 4 to the lower middle part of the tapered mating section 2, the axial length of the internal threaded connecting hole 5 in this embodiment is sufficiently extended compared to the internal threaded connecting holes with shorter axial lengths in the prior art. This increases the length of the threaded connection, and the overall connection strength is multiplied after the external screw is tightened in place.

[0030] Meanwhile, in this embodiment, since the crown connection end 4 has a slit 6 extending axially downward from the top to the lower part of the crown connection end 4, and the slit 6 penetrates the inner and outer walls of the crown connection end 4 radially, and the slit 6 is evenly distributed circumferentially along the internal thread connection hole 5, during the tightening of the external screw, on the one hand, because the axial length of the internal thread connection hole 5 is increased significantly, it is very likely to generate heat when the external screw is screwed in. The slit 6 can form a heat dissipation channel, and the heat can be conducted upward from the heat dissipation channel to the hole of the external crown, and then dissipated upward. On the other hand, and more importantly, after the slit 6 is set, the crown connecting end 4, which was originally a circumferentially continuous whole, is divided into circumferentially discontinuous wholes, although the bottom is connected. Thus, during the screwing-in process, the external screw compresses the circumferentially discontinuous crown connecting end 4, giving it a slight elastic outward expansion capability. This elastically expanding crown connecting end 4 then compresses the inner wall of the crown's insertion hole. After the external screw is screwed in, the crown can be connected to the composite abutment in a very tight manner. Therefore, in this embodiment, the composite abutment, to facilitate a tight, reliable, and secure connection between the crown and the abutment, features both an axial extension of the internal threaded connecting hole 5 and a specially designed slit 6. These two aspects combined ensure that the crown maintains a tight connection with the composite abutment even after prolonged use.

[0031] In this embodiment, after the slits 6 are evenly distributed circumferentially along the internal threaded connection hole 5, the degree of outward expansion of the crown connection end 4 as a whole can remain balanced in the circumferential direction. As an optimization of the number of slits 6, three slits 6 are set, which can avoid the failure of the threaded connection due to too many slits 6, while also having a suitable elastic outward expansion capability.

[0032] In this embodiment, the composite abutment, after adopting the above-described structure, has been further optimized and improved in certain areas. Specifically, the outer wall of the conical gingival soft tissue connecting segment 3 near the top surface is constructed as a cylindrical sidewall 31, and a slightly curved, concave arc-shaped sidewall 33 is constructed between the cylindrical sidewall 31 and the outer conical sidewall 32 of the conical gingival soft tissue connecting segment 3 below it. The concave arc-shaped sidewall 33, after its configuration, causes the outer wall of the conical gingival soft tissue connecting segment 3 near the top surface to form a slightly outwardly extending, slightly curved, and slightly concave wing structure (see enlarged reference). Figure 3The wing structure increases the contact area between the end of the conical gingival soft tissue connection segment 3 and the gingival soft tissue. Furthermore, the wing structure extends slightly outward relative to the conical gingival soft tissue connection segment 3, exerting a downward squeezing effect on the gingival soft tissue near the tip of the conical gingival soft tissue connection segment 3. This promotes a good bond between the gingival soft tissue and the tip of the conical gingival soft tissue connection segment 3, thereby enhancing the reliability and strength of the connection. It should be noted that because the concave arc-shaped sidewall 33 has been provided and constructed into the aforementioned wing structure, the overall stress is relatively concentrated at this location. Therefore, in this embodiment, a cylindrical sidewall 31 is provided to reduce stress concentration and improve the mechanical strength of the conical gingival soft tissue connection segment 3 at its tip.

[0033] refer to Figure 1-4 To further enhance the positioning effectiveness when the crown is connected to the composite abutment, the top surface of the conical gingival soft tissue connecting segment 3 extends radially outward from the bottom of the crown connecting end 4, and the top surface is provided with a radially protruding ridge 7, which is evenly distributed circumferentially along the crown connecting end 4. To achieve positioning engagement with the protruding ridge 7, a corresponding positioning groove (not shown) is also provided at the bottom of the crown. During crown installation, the protruding ridge 7 is engaged in the positioning groove, thereby achieving positioning engagement between the two.

[0034] In this embodiment, the crown connection end 4 is constructed as a cone shape with an axially oriented cutting wall 41 in the lower middle part. The cutting wall 41 is circumferentially full along the crown connection end 4, meaning it is continuously arranged without interruption. The inner end of the convex ridge 7 in the radial direction connects to the connecting wall 42 between two adjacent cutting walls 41, and the outer end of the convex ridge 7 extends in the radial direction, leaving a gap between it and the top edge of the cone-shaped gingival soft tissue connection segment 3. This design and arrangement of the convex ridge 7 allows for proper positioning and matching of the crown base. Furthermore, during positioning and matching, the positioning groove at the crown base does not need to penetrate the sidewall near the base of the crown, maintaining the integrity of the crown base sidewall. This is mainly because the outer end of the convex ridge 7 extends in the radial direction, leaving a gap between it and the top edge of the cone-shaped gingival soft tissue connection segment 3. In other words, the convex ridge 7 does not extend to the edge, thus the positioning groove that mates with the convex ridge 7 does not penetrate the sidewall of the crown base.

[0035] In this embodiment, the slit 6 has also been improved. Specifically, the slit 6 is constructed as a rectangular slit, with two opposing sidewalls at the upper middle part forming two opposing outwardly expanding walls 61. At the root, the rectangular slit forms a concave arc-shaped groove 62. In this design, the rectangular slit is primarily designed for ease of machining, while the outwardly expanding walls 61 increase the distance between the two opposing sidewalls at the top, giving the crown connection end 4 a superior ability to expand outwards elastically. This facilitates the insertion of the external screw at the top, especially as the screw's insertion depth gradually increases; the more the crown connection end 4 expands outwards, the easier it is to continue screwing downwards. The arc-shaped groove 62 formed at the root, compared to two opposing right-angled roots, is more rounded, greatly reducing stress concentration. More importantly, the arc-shaped groove 62 increases the distance between the two opposing sidewalls at the root, promoting an elastic outward expansion tendency at the root as well.

[0036] In this embodiment, it is particularly noted that the axial length of the conical mating segment 2 is greater than the axial length of the conical gingival soft tissue connecting segment 3. The conical mating segment 2 is mainly used for positioning and mating in the external implant, and its sufficient length can maintain a stable fit.

[0037] Considering that existing composite abutments are mainly fixed by threads when screwed into external implants, to enhance the strength of this connection, in this embodiment, the threaded connection segment 1 can also form a conical positioning head 11 at its bottom, which has a flat bottom surface. Compared to the existing structure where the bottom of the threaded connection segment 1 is directly flat, the addition of the positioning head can provide positioning and fitting at the bottom after the threaded connection. Of course, it should be noted that the setting of this positioning head increases the processing difficulty of the threaded connection segment 1. In actual production, it can be selected and set as needed, and no special requirements are specified in this application.

[0038] It should be noted that the term "external" as used above, such as external crowns, external implants, and external screws, refers only to the main body of this application, namely the composite abutment. It can be understood that "external" here does not mean the composite abutment itself, but rather external components related to it that are relative to itself.

[0039] The composite abutment in this application has the main advantage of being directly usable for crown installation. Furthermore, through the design of the suture 6 and the optimization and improvement of the specific structure during installation, it effectively maintains the strength of the connection, ensuring its stability and reliability. Simultaneously, the local structure has been optimized and improved, resulting in significant practical benefits.

[0040] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A composite abutment for dental implants, characterized in that: The composite abutment includes a threaded connecting section, a tapered mating section, a tapered gingival soft tissue connecting section, and a crown connecting end arranged sequentially from bottom to top along a coaxial axis. The top of the composite abutment has a coaxial internal threaded connecting hole. The internal threaded connecting hole extends downward from the top surface of the crown connecting end to the lower middle part of the tapered mating section. The crown connecting end has a slit extending axially downward from its top to the lower middle part of the crown connecting end. The slit penetrates the inner and outer walls of the crown connecting end radially and is circumferentially distributed along the internal threaded connecting hole.

2. The composite abutment for dental implants according to claim 1, characterized in that: The conical gingival soft tissue junction has a cylindrical sidewall on its outer sidewall near the top surface of the conical gingival soft tissue junction, and a slightly curved concave arc-shaped sidewall is formed between the cylindrical sidewall and the outer conical sidewall of the conical gingival soft tissue junction below it.

3. The composite abutment for dental implants according to claim 1 or 2, characterized in that: The top surface of the conical gingival soft tissue connection segment extends radially out of the bottom of the crown connection end, and the radially protruding top surface is provided with radially arranged ridges, which are circumferentially distributed along the crown connection end.

4. The composite abutment for dental implants according to claim 3, characterized in that: The lower middle part of the crown connection end has an axially arranged cutting wall, which is circumferentially distributed along the crown connection end. The inner end of the convex ridge in the radial direction is connected to the connecting wall between two adjacent cutting walls, and the outer end of the convex ridge in the radial direction extends and leaves a gap between it and the top edge of the conical gingival soft tissue connection segment.

5. The composite abutment for dental implants according to claim 1, characterized in that: The cut is constructed as a rectangular cut, and the two opposite sidewalls of the rectangular cut are constructed as two oppositely inclined outward expansion walls in the upper middle part. The rectangular cut forms an inwardly concave arc-shaped groove at the root.

6. The composite abutment for dental implants according to claim 1, characterized in that: The axial length of the conical mating segment is greater than the axial length of the conical gingival soft tissue connection segment.

7. The composite abutment for dental implants according to claim 1, characterized in that: The threaded connection section forms a conical positioning head at the bottom, and the positioning head has a flat bottom surface.

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