Titanium abutment, implant abutment assembly and two-section implant

Abstract

The utility model discloses a titanium abutment, an implant abutment assembly and a two-section implant, and belongs to the field of oral medical treatment. The titanium abutment is used for connecting an implant and a dental crown and comprises a dental crown connecting section, a cuff and a fixing section which are sequentially arranged from the crown side to the root side, the fixing section is used for being inserted into the implant in a matched mode, the dental crown connecting section is used for installing the dental crown, and the cuff is used for fixing the dental crown after the fixing section and the implant are inserted in place. The limiting part is in limiting fit with one end, close to the crown, of the implant; a through hole penetrating from the crown side to the root side is formed in the titanium abutment, and a threaded rod piece penetrates through the through hole, so that the titanium abutment is connected with the implant. On one hand, a novel titanium-based table with high reliability and excellent mechanical performance is provided for clinic; on the other hand, the length of the lower edge of the abutment is increased, and a neck stress concentration area of the implant is avoided. The titanium-based table manufacturing method is simple, reliable, low in cost and suitable for large-scale production and application.

Description

Technical Field

[0001] This utility model belongs to the field of oral medical care and relates to oral implant restoration technology, particularly to a titanium abutment, an implant abutment assembly, and a two-stage implant. Background Technology

[0002] Dental implant restoration is one of the main treatment options for tooth loss, offering advantages such as not damaging normal teeth, chewing function similar to natural teeth, comfort, aesthetics, and long lifespan. Implants can be categorized into one-piece and two-piece types based on whether the abutment and implant body can be separated. One-piece implants use a single-piece design with the abutment and implant body not separable; due to their limited application flexibility, they are rarely used clinically. Two-piece implants, on the other hand, allow for separation of the abutment and implant body, offering greater flexibility, wider applicability, and better long-term results, and are widely used clinically.

[0003] The abutment is a crucial component in two-piece implant systems, connecting the implant to the superstructure (usually a crown). Its reliability directly impacts the stability and long-term success rate of the implant restoration. Most existing two-piece implants use a zirconia implant and a zirconia abutment. The mainstream connection method is internal connection, where the bottom of the abutment is inserted into the implant. This can be further categorized into tapered connections and internal hexagonal connections. In this design, the connection between the zirconia abutment and implant suffers from significant stress concentration due to the relatively complex structure and the oral mechanical environment. Zirconia itself is hard but brittle, making the abutment more sensitive to stress concentration and less resistant to fracture from various causes. Furthermore, the oral cavity is a consistently warm and humid environment, and the constantly changing chewing forces create alternating loads on the implant. This makes the zirconia abutment prone to low-temperature aging, accompanied by the generation and propagation of microcracks, increasing the fracture rate of the zirconia abutment.

[0004] Therefore, there is an urgent need to design a new type of implant abutment to overcome the problems of poor fracture resistance and high fracture rate in clinical practice of the aforementioned zirconia abutments. Utility Model Content

[0005] The purpose of this invention is to provide a titanium abutment, an implant abutment assembly, and a two-section implant to solve the problems of poor fracture resistance and high fracture rate in clinical use of the aforementioned zirconia abutments.

[0006] To achieve the above objectives, this utility model provides the following solution:

[0007] This utility model provides a titanium abutment for connecting an implant and a dental crown. The titanium abutment includes a crown connecting section, a cuff, and a fixing section arranged sequentially from the coronal to the apical side. The fixing section is used for fitting and inserting the implant, the crown connecting section is used for installing the dental crown, and the cuff is used to limit and cooperate with the coronal end of the implant after the fixing section and the implant are inserted into place. The titanium abutment has a through hole extending from the coronal side to the apical side for threaded rods to pass through, thereby realizing the connection between the titanium abutment and the implant.

[0008] In some embodiments, the crown connector, the cuff, and the fixing segment are arranged coaxially and integrally formed.

[0009] In some embodiments, the fixing segment is frustum-shaped, with the larger end of the fixing segment facing the coronal direction and the smaller end facing the root direction; the outer wall of the fixing segment is provided with anti-rotation grooves and / or anti-rotation protrusions that can be adapted to the implant.

[0010] In some embodiments, the cuff is cylindrical and protrudes radially outward from the fixing section and the crown connecting section; both the fixing section and the crown connecting section are smoothly connected to the cuff through a concave arc transition structure.

[0011] In some embodiments, the fixing segment can be completely inserted into the abutment cavity of the implant, and the axial length of the fixing segment is not less than one-third of the overall axial length of the implant.

[0012] In some embodiments, the crown connector is cylindrical, and the outer wall of the crown connector is provided with a positioning groove and / or a positioning protrusion for positioning and installing the outer abutment or crown.

[0013] This invention proposes an implant abutment assembly, including a zirconia outer abutment and a titanium abutment as described above. The zirconia outer abutment is fitted onto the outside of the crown connection segment and is used to fix the crown.

[0014] In some embodiments, the inner wall of the zirconia abutment is provided with a positioning and mounting structure one, and the outer wall of the crown connecting segment is provided with a positioning and mounting structure two adapted to the positioning and mounting structure one; one of the positioning and mounting structure one and the positioning and mounting structure two is a positioning groove, and the other is a positioning protrusion.

[0015] This utility model proposes a two-section implant, including an implant and a titanium abutment as described above. The end of the implant near the coronal side is provided with an abutment receiving cavity adapted to the fixing section. The opening edge of the abutment receiving cavity near the coronal side is provided with a convex arc transition structure. The convex arc transition structure can contact and cooperate with the concave arc transition structure between the fixing section and the cuff.

[0016] In some embodiments, the implant is a zirconium oxide implant.

[0017] The present invention achieves the following technical advantages over the prior art:

[0018] This invention addresses the clinical problem of high fracture rates in existing zirconia abutments by innovating and optimizing traditional zirconia abutments. On one hand, a titanium abutment replaces the traditional zirconia abutment in connecting the implant to the superstructure, improving the mechanical strength of the connection structure and enhancing the fracture toughness and fatigue strength of the abutment. This provides a new titanium abutment with high reliability and excellent mechanical properties for clinical use. On the other hand, the length of the lower edge of the abutment is extended, moving the lower edge of the titanium abutment down to the middle third of the implant root area, avoiding the stress concentration zone at the implant neck. Through optimized abutment structural design and material selection, high-performance abutments are achieved. Furthermore, its manufacturing method is simple, reliable, and low-cost, making it suitable for large-scale production and application. Therefore, this invention has broad market application prospects and practical value.

[0019] In the implant abutment assembly proposed in this invention, the crown connector and the zirconia abutment together constitute the crown connector. This composite structure not only combines the advantages of both titanium alloy and zirconia, such as the good mechanical properties of titanium alloy and the excellent aesthetic properties and high biocompatibility of zirconia, but also achieves a stable connection between the crown connector and the zirconia abutment, thereby improving the overall performance of the abutment assembly.

[0020] The two-section implant proposed in this invention includes the aforementioned titanium abutment and possesses all the characteristics of the aforementioned titanium abutment, which will not be repeated here. Moreover, from the perspective of improving mechanical performance, this two-section implant extends the depth of the titanium abutment fixation section, moving the lower edge of the fixation section down to the middle 1 / 3 region of the implant root, avoiding the stress concentration area of ​​the implant neck; combined with the screw fixation of the threaded rod and the conical connection fixation method between the fixation section and the implant, along with the design of the anti-rotation structure between the fixation section and the implant, a reliable connection and fit between the implant and the titanium abutment is achieved, effectively improving the fracture resistance of the implant in clinical practice. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a three-dimensional structural diagram of the titanium base disclosed in an embodiment of the present utility model;

[0023] Figure 2 This is a schematic diagram of the overall structure of the titanium base disclosed in the embodiment of this utility model;

[0024] Figure 3 This is a front view of the titanium base disclosed in an embodiment of the present utility model;

[0025] Figure 4 This is a top view of the titanium base disclosed in an embodiment of the present utility model;

[0026] Figure 5 This is an overall assembly drawing of the implant abutment assembly disclosed in an embodiment of the present utility model;

[0027] Figure 6 for Figure 5 The main view;

[0028] Figure 7 for Figure 5 Top view;

[0029] Figure 8 for Figure 5 Exploded view;

[0030] Figure 9 This is a three-dimensional structural diagram of the zirconium oxide outer base disclosed in an embodiment of the present invention;

[0031] Figure 10 This is a schematic diagram of the overall structure of the zirconium oxide outer base disclosed in an embodiment of the present invention;

[0032] Figure 11 This is a front view of the zirconium oxide outer base disclosed in an embodiment of the present invention;

[0033] Figure 12 This is a top view of the zirconium oxide outer base disclosed in an embodiment of the present invention;

[0034] Figure 13 This is a schematic cross-sectional view of the assembly structure of the implant abutment assembly disclosed in an embodiment of the present utility model;

[0035] Figure 14 This is an overall assembly diagram of the two-section implant disclosed in this utility model embodiment;

[0036] Figure 15 for Figure 14 Exploded view;

[0037] Figure 16 This is a cross-sectional schematic diagram of the assembly structure of the two-section implant disclosed in an embodiment of the present utility model;

[0038] Figure 17 This is a cross-sectional schematic diagram of the implant disclosed in an embodiment of the present utility model;

[0039] Figure 18 This is a cross-sectional schematic diagram of the assembly structure of the titanium base and the threaded rod disclosed in an embodiment of this utility model.

[0040] In the figure, the attached reference numerals are:

[0041] 1. Titanium base; 11. Crown connection section; 111. Positioning protrusion; 12. Cuff; 13. Fixing section; 131. Anti-rotation groove; 14. Through hole; 141. Limiting step; 15. Concave arc transition structure;

[0042] 2. Threaded rods;

[0043] 3. Implant; 31. Abutment receiving cavity; 32. Anti-rotation protrusion; 33. Convex arc transition structure; 34. Positioning step;

[0044] 4. Implant abutment assembly;

[0045] 5. Zirconia outer base; 51. Positioning groove; 52. Limiting boss; 53. Rounded transition structure;

[0046] 6. Two-stage implant. Detailed Implementation

[0047] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0048] One of the objectives of this invention is to provide a titanium abutment to address the problems of poor fracture resistance and high fracture rate in clinical practice associated with current zirconia implants.

[0049] Another objective of this invention is to provide an implant abutment assembly comprising the aforementioned titanium abutment.

[0050] Another objective of this invention is to provide a two-section implant comprising the aforementioned titanium base.

[0051] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0052] Example 1

[0053] like Figures 1-4 As shown, this embodiment provides a titanium abutment 1 for connecting an implant 3 and a crown. The titanium abutment 1 is cylindrical in shape and includes a crown connecting section 11, a cuff 12, and a fixing section 13 arranged sequentially from the coronal side to the apical side. The fixing section 13 is used to fit and insert the implant 3, the crown connecting section 11 is used to install the crown, and the cuff 12 is used to limit the fit with the end of the implant 3 near the coronal side after the fixing section 13 and the implant 3 are inserted into place. A through hole 14 is provided in the titanium abutment 1, extending from the coronal side to the apical side. The through hole 14 passes through both axial ends of the titanium abutment 1. The through hole 14 is mainly used for threaded rods 2 to pass through, so that after the fixing section 13 and the implant 3 are inserted into place, the threaded rods 2 are threadedly connected to the internal threaded holes of the implant 3, thereby realizing the fixed connection between the titanium abutment 1 and the implant 3. The aforementioned titanium abutment 1 is suitable for two-stage implants. It replaces the traditional zirconia abutment with a titanium abutment to connect the implant to the superstructure (i.e., crown), effectively improving the fracture toughness and fatigue strength of the abutment. Specifically, the titanium abutment 1 is made of titanium alloy. Taking Ti-6Al-4V titanium alloy as an example, the Ti content is 90%, the Al content is 6%, the V content is 4%, C≤0.1%, O≤0.2%, N≤0.05%, and H≤0.0125%.

[0054] In some embodiments, the crown connecting segment 11, the cuff 12, and the fixing segment 13 are arranged coaxially and integrally formed.

[0055] In some embodiments, the crown connector 11 is cylindrical, and its outer wall is provided with a positioning groove 51 and / or a positioning protrusion 111 for positioning and mounting the outer abutment or crown. Generally, it is preferred that the outer wall of the crown connector 11 is provided with the positioning protrusion 111, while the outer abutment or the inner wall of the crown is provided with a positioning groove 51 that matches the positioning protrusion 111. As a further preferred embodiment, the positioning protrusion 111 is preferably a semi-cylindrical protrusion structure, with four semi-cylindrical protrusion structures evenly distributed circumferentially on the outer wall of the crown connector 11, and the axis of any semi-cylindrical protrusion structure is parallel to the axial direction of the crown connector 11.

[0056] In some embodiments, it is preferable that the axial length of the semi-cylindrical protrusion structure is not longer than the axial length of the crown connection segment 11. For example, the axial length of the semi-cylindrical protrusion structure can be set to 3mm to 4mm.

[0057] It should be noted that, depending on the needs of intraoral application, the aforementioned crown connector 11 can be directly fitted and installed with the crown, or it can be first fixed to an external abutment as needed, and then the crown is fitted over the external abutment. Taking the external abutment installed on the outside of the crown connector 11 as an example, the external abutment is fitted over the crown connector 11 with a clearance fit. The two are positioned and guided by the interlocking of the positioning protrusion 111 and the positioning groove 51, achieving positioning guidance and anti-rotation positioning. After the external abutment is installed in place, adhesive can be poured or applied between the external abutment and the crown connector 11 to fix the external abutment on the crown connector 11, ensuring fracture resistance while improving aesthetics. The crown can also be directly bonded to the crown connector 11 for retention.

[0058] In some embodiments, the fixing segment 13 is frustum-shaped, meaning the fixing segment 13 is generally conical, with its larger end facing the coronal direction and its smaller end facing the axillary direction. The larger end of the fixing segment 13 connects to the cuff 12. The outer wall of the fixing segment 13 is provided with an anti-rotation groove 131 and / or an anti-rotation protrusion 32 that can be adapted to the implant 3. Generally, it is preferable to provide the anti-rotation groove 131 on the outer wall of the fixing segment 13, while the inner wall of the abutment receiving cavity 31 of the implant 3 is provided with an anti-rotation protrusion 32 that matches the shape of the anti-rotation groove 131. In practical applications, such as Figures 14-16 As shown, the titanium abutment 1 is coaxially inserted into the abutment receiving cavity 31 of the implant 3. The outer contour of the fixing section 13 matches the inner contour of the abutment receiving cavity 31. That is, when the fixing section 13 is conical, the abutment receiving cavity 31 is a conical cavity, and the two are fitted with a clearance. After the anti-rotation protrusion 32 and the anti-rotation groove 131 are fitted together, they can prevent the titanium abutment 1 from rotating relative to the abutment receiving cavity 31. The anti-rotation protrusion 32 and the anti-rotation groove 131 are arranged along the axial direction of the implant 3 and the titanium abutment 1, respectively. Therefore, the anti-rotation protrusion 32 and the anti-rotation groove 131 can act as a guiding and positioning structure when the titanium abutment 1 is inserted into the abutment receiving cavity 31, and can also play an anti-rotation role to prevent the titanium abutment 1 and the abutment receiving cavity 31 from rotating relative to each other after the titanium abutment 1 is inserted into the abutment receiving cavity 31.

[0059] In some embodiments, the outer wall of the fixed section 13 may have 2 to 6 anti-rotation grooves 131 evenly distributed circumferentially, and the anti-rotation protrusions 32 correspond one-to-one with the anti-rotation grooves 131. For example Figures 1-4As shown, the concave surface of the anti-rotation groove 131 is preferably an arc surface. To limit the downward movement of the titanium abutment 1, the anti-rotation groove 131 is further deepened near the coronal region to form a limiting recess. Correspondingly, the anti-rotation protrusion 32 has an outwardly convex bending structure that matches the limiting recess near the coronal region. To avoid stress concentration, a smooth rounded transition is preferably provided at the limiting recess, and the sharp edges of each anti-rotation groove 131 are chamfered. This not only avoids damage to the structural integrity and strength reduction of the outer wall of the fixing section caused by the anti-rotation groove design, thereby improving the mechanical properties of the titanium abutment 1 and the implant 3, but also effectively prevents breakage at the connection between the fixing section 13 and the implant 3.

[0060] In some implementations, such as Figures 1-4 As shown, the end of the anti-rotation groove 131 furthest from the coronal side extends to the bottom of the anti-rotation groove 131, and the anti-rotation groove 131 is tapered from the coronal side to the axillary side. The anti-rotation groove 131 covers half of the axial length of the fixing segment 13. The anti-rotation groove 131 is located at the axillary side of the fixing segment 13, while the coronal side of the fixing segment 13 is a frustum segment. This frustum segment matches the tapered inner wall of the abutment receiving cavity 31 to ensure a tight connection between the titanium abutment 1 and the implant 3. The axial length of this frustum segment can be 2 mm, and correspondingly, the anti-rotation groove 131 covers 2 mm of the axial length of the fixing segment 13.

[0061] In some embodiments, the taper of the fixed section 13 is preferably 3° to 11°, with 3° being optimal.

[0062] In some embodiments, the cuff 12 is cylindrical. Due to its short axial length, the cuff 12 is essentially a disc, and it protrudes radially outward from the large end of the fixing section 13 and the crown connecting section 11. Both the fixing section 13 and the crown connecting section 11 are smoothly connected to the cuff 12 via a concave arc transition structure 15. Figures 1-4 As shown, both the fixed section 13 and the crown connecting section 11 are connected to the cuff 12 through the concave arc transition structure 15. The concave arc transition structure 15 realizes a smooth transition between the fixed section 13 and the crown connecting section 11 and the end face of the cuff 12, which can reduce stress concentration and avoid excessive stress concentration at the connection point, thus increasing the risk of breakage.

[0063] In some implementations, the axial thickness of the cuff 12 is generally 0.4 mm, which can minimize the exposure of metal in the mouth while ensuring strength.

[0064] In some embodiments, the threaded rod 2 is a bolt or screw. The through hole 14 is a cylindrical hole with a reduced diameter design from the coronal to the axillary side, forming a second-order axial hole. A limiting step 141 is formed at the upper edge of the cuff 12 (i.e., the end near the coronal side). This limiting step 141 can support and limit the head of the threaded rod 2 after the bottom of the threaded rod 2 is threaded into the internal threaded hole at the axillary position of the implant 3. The cooperation between the head of the threaded rod 2 and the limiting step 141 can further press the titanium abutment 1 axially into the abutment receiving cavity 31, ensuring a reliable connection between the titanium abutment 1 and the implant 3. In addition, the limiting step 141 is set at the upper edge of the cuff 12 (i.e., the end near the coronal side), which increases the wall thickness of the fixing section 13 in the stress concentration area, thereby enhancing the strength and mechanical reliability of the titanium abutment 1. In some embodiments, the diameter of the through hole 14 above the limiting step 141 can be 2 mm, and the diameter of the through hole 14 above the limiting step 141 can be 1.4 mm.

[0065] In some embodiments, the fixing segment 13 can be completely inserted into the abutment receiving cavity 31 of the implant 3, and the axial length of the fixing segment 13 is not less than one-third of the overall axial length of the implant 3. Compared with the traditional zirconia abutment, this design extends the length of the lower edge of the abutment. After the titanium abutment 1 is assembled with the implant 3, the lower edge of the abutment moves down to the middle 1 / 3 area of ​​the implant 3, avoiding the stress concentration area at the neck of the implant 3. This effectively improves the connection strength and reliability between the implant 3 and the titanium abutment 1, while also improving the fracture resistance of the implant 3 and the titanium abutment 1, achieving long-term reliability of the two-segment implant and meeting clinical needs.

[0066] In some embodiments, the implant 3 is machined using high-precision CNC cutting technology, while the titanium abutment 1 and threaded rod 2 are manufactured using CAD / CAM machine cutting. The gap between the fixed section 13 of the titanium abutment 1 and the abutment receiving cavity 31 is 1μm to 10μm, with 1μm being optimal. This gap is controlled through high-precision machining to reduce errors and ensure the tightness and precision of the connection and assembly between the titanium abutment 1 and the implant 3. The high-precision machining can be performed using high-precision CNC cutting technology on a high-precision lathe, while allowing for a certain machining tolerance in the design.

[0067] In some embodiments, the titanium base 1 has a total length of 8mm to 10mm and a wall thickness of 0.4mm to 0.6mm.

[0068] The proposed solution features a titanium abutment 1 with a fixed section 13 that matches the inner wall of the abutment receiving cavity 31 of the implant 3. This, combined with the threaded rod 2, forms a two-section implant abutment connection structure. The tapered connection between the implant 3 and the fixed section 13, along with the screw-locking connection between the threaded rod 2 and the implant 3, and the anti-rotation structure formed by the inner wall of the implant 3 and the outer wall of the titanium abutment 1, enhances the tightness and reliability of the implant abutment connection structure. Simultaneously, the raised anti-rotation structure on the inner wall of the implant 3 increases the wall thickness of the implant portion, preventing structural integrity damage and strength reduction caused by the anti-rotation groove on the titanium abutment 1. The weakest point at the connection between the implant 3 and the titanium abutment 1 has a wall thickness greater than 0.9 mm (the weakest point wall thickness is the cavity wall thickness between two adjacent anti-rotation protrusions 32 in the abutment receiving cavity 31), and the titanium abutment 1 thickness is not less than 0.4 mm. This improves the flexural strength of the implant abutment connection structure and deeply optimizes the two-section implant abutment connection structure.

[0069] The beneficial effects of this utility model are:

[0070] (1) The use of titanium base significantly enhances the flexural strength of the two-stage implant and reduces the cracking rate.

[0071] (2) The lower edge of the titanium abutment was moved down to the middle 1 / 3 area of ​​the implant root, avoiding the stress concentration area of ​​the implant neck, reducing the stress concentration of the implant abutment connection structure, and effectively reducing the risk of cracking.

[0072] In summary, this invention addresses the clinical problem of high fracture rates in existing zirconia abutments by innovating and optimizing traditional zirconia abutments. On one hand, it replaces the traditional zirconia abutment with a titanium abutment to connect the implant to the superstructure, improving the abutment's fracture toughness and fatigue strength, providing a new titanium abutment with high reliability and excellent mechanical properties for clinical use. On the other hand, by extending the length of the lower edge of the abutment and moving it down to the middle third of the implant root area, it avoids the stress concentration zone at the implant neck. Through optimized abutment structural design and material selection, high-performance abutments are achieved. Furthermore, its manufacturing method is simple, reliable, and low-cost, making it suitable for large-scale production and application. Therefore, this invention has broad market application prospects and practical value.

[0073] Example 2

[0074] This embodiment proposes an implant abutment assembly 4, including a zirconia outer abutment 5 and a titanium abutment 1 as disclosed in Embodiment 1. The zirconia outer abutment 5 is fitted onto the outside of the crown connector segment 11, and the zirconia outer abutment 5 is used to fix the crown. Preferably, the zirconia outer abutment 5 and the crown connector segment 11 are fitted with a clearance fit. After they are fitted in place, they can be reinforced by adhesive, thereby completing the fitting and fixation of the zirconia outer abutment 5 and the crown connector segment 11.

[0075] In some embodiments, the inner wall of the zirconia abutment 5 is provided with a positioning and mounting structure one, and the outer wall of the crown connecting segment 11 is provided with a positioning and mounting structure two adapted to the positioning and mounting structure one; one of the positioning and mounting structures one and the positioning and mounting structure two is a positioning groove 51, and the other is a positioning protrusion 111. Generally, it is preferred that the outer wall of the crown connecting segment 11 is provided with a positioning protrusion 111, and the inner wall of the zirconia abutment 5 is provided with a positioning groove 51 adapted to the positioning protrusion 111. As a further preferred embodiment, the positioning protrusion 111 is preferably a semi-cylindrical protrusion structure, and four semi-cylindrical protrusion structures are evenly distributed along the circumference of the outer wall of the crown connecting segment 11, and the axis of any semi-cylindrical protrusion structure is parallel to the axial direction of the crown connecting segment 11.

[0076] In some embodiments, it is preferable that the axial length of the semi-cylindrical protrusion structure is not longer than the axial length of the crown connection segment 11. For example, the axial length of the semi-cylindrical protrusion structure can be set to 3mm to 4mm.

[0077] In some embodiments, the zirconia outer abutment 5 includes a cylindrical body and a limiting boss 52 disposed at the bottom of the cylindrical body. The limiting boss 52 is annular, and its outer diameter is larger than that of the cylindrical body. After the crown connecting segment 11 is installed in place, the limiting boss 52 contacts and fits precisely with the upper end face of the cuff 12, thereby achieving the installation and positioning of the zirconia outer abutment 5. In order to adapt to the concave arc transition structure 15 between the crown connecting segment 11 and the cuff 12, the inner edge of the limiting boss 52 is provided with an arc transition structure 53 that matches the concave and convex shape of the concave arc transition structure 15. After the limiting boss 52 contacts and limits the cuff 12, the limiting boss 52 can use the arc transition structure 53 to contact and limit the concave arc transition structure 15 between the crown connecting segment 11 and the cuff 12. At the same time, the design of the arc transition structure 53 also realizes a smooth transition between the cylindrical body and the limiting boss 52, which can reduce stress concentration and improve structural strength. Similarly, in order to further improve the structural reliability of the zirconia outer base 5, a concave arc transition structure can also be provided between the upper end face of the limiting boss 52 and the outer wall of the cylindrical body.

[0078] The zirconia abutment 5 is fitted over the crown connector 11 with a clearance fit. The positioning protrusion 111 and the positioning groove 51 work together to guide installation and prevent rotation. After the zirconia abutment 5 is in place, adhesive can be poured or applied between the abutment 5 and the crown connector 11 to fix the abutment 5 to the crown connector 11, ensuring fracture resistance while improving aesthetics. The crown is fitted over the zirconia abutment 5 and bonded to it for retention.

[0079] In the aforementioned implant abutment assembly 4, the crown connector 11 and the zirconia external abutment 5 together constitute the crown connector. This composite structure not only combines the advantages of both titanium alloy and zirconia, such as the excellent mechanical properties of titanium alloy and the superior aesthetic properties and high biocompatibility of zirconia, but also achieves a stable connection between the crown connector 11 and the zirconia external abutment 5, improving the overall performance of the abutment. The implant abutment assembly 4 utilizes the structure and material advantages of the titanium abutment 1 from Example 1, and the zirconia external abutment 5 does not affect the inherent performance of the titanium abutment 1.

[0080] Example 3

[0081] This embodiment proposes a two-section implant 6, including an implant 3 and a titanium abutment 1 as disclosed in Embodiment 1. The implant 3 is provided with an abutment receiving cavity 31 adapted to the fixation section 13 at the end near the coronal side. The opening edge of the abutment receiving cavity 31 near the coronal side is provided with a convex arc transition structure 33. The convex arc transition structure 33 can contact and cooperate with the concave arc transition structure 15 between the fixation section 13 and the cuff 12.

[0082] In some embodiments, the implant 3 is preferably a zirconia implant.

[0083] In practice, after implant 3 is inserted, the fixing segment 13 of the titanium abutment 1 is inserted into the abutment receiving cavity 31 inside implant 2. Appropriate rotation ensures proper matching between the titanium abutment 1 and implant 3, so that the anti-rotation groove 131 on the titanium abutment 1 fits tightly against the anti-rotation protrusion 32 inside the abutment receiving cavity 31. Finally, the threaded rod 2 is inserted into the through hole 14 of the titanium abutment 1, and by rotating the threaded rod 2, it is threaded and tightened into the internal threaded hole at the root position of implant 3 until the head of the threaded rod 2 contacts and engages with the limiting step 141, completing the reliable connection between the titanium abutment 1 and implant 3. The zirconia external abutment 5 from Example 2 can be optionally installed on the titanium abutment 1. Finally, the prefabricated crown is installed as needed.

[0084] The main innovation of the two-segment implant 6 lies in extending the depth of the fixing segment 13 of the titanium abutment 1 from the perspective of improving mechanical performance. The lower edge of the fixing segment 13 is moved down to the middle 1 / 3 area of ​​the implant 3, avoiding the stress concentration area of ​​the implant neck. Combined with the screw fixation of the threaded rod and the conical connection fixation method between the fixing segment 13 and the implant 3, and the design of the anti-rotation structure between the fixing segment 13 and the implant 3, a reliable connection and fit between the implant 3 and the titanium abutment 1 is achieved, effectively improving the fracture resistance of the implant in clinical practice.

[0085] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A titanium abutment for connecting an implant to a dental crown, characterized in that, The device includes a crown connector, a cuff, and a fixation section arranged sequentially from the coronal to the apical side. The fixation section is used for fitting and inserting with the implant, the crown connector is used for installing the crown, and the cuff is used to limit the fit with the coronal end of the implant after the fixation section and the implant are in place. The titanium abutment has a through hole extending from the coronal side to the apical side for threaded rods to pass through, thereby connecting the titanium abutment to the implant.

2. The titanium base according to claim 1, characterized in that, The crown connecting section, the cuff, and the fixing section are arranged coaxially and integrally formed.

3. The titanium base according to claim 2, characterized in that, The fixing section is truncated cylindrical, with the larger end facing the coronal direction and the smaller end facing the root direction; the outer wall of the fixing section is provided with anti-rotation grooves and / or anti-rotation protrusions that can be adapted to the implant.

4. The titanium base according to any one of claims 1 to 3, characterized in that, The cuff is cylindrical and protrudes radially outward from the fixing section and the crown connecting section; the fixing section and the crown connecting section are both smoothly connected to the cuff through a concave arc transition structure.

5. The titanium base according to any one of claims 1 to 3, characterized in that, The fixing segment can be completely inserted into the abutment cavity of the implant, and the axial length of the fixing segment is not less than one-third of the overall axial length of the implant.

6. The titanium base according to claim 2 or 3, characterized in that, The crown connecting section is cylindrical, and the outer wall of the crown connecting section is provided with a positioning groove and / or positioning protrusion for positioning and installation of the outer abutment or crown.

7. An implant abutment assembly, characterized in that, The device includes a zirconia abutment and a titanium abutment as described in any one of claims 1 to 5, wherein the zirconia abutment is fitted onto the outside of the crown connection segment and is used to fix the crown.

8. The implant abutment assembly according to claim 7, characterized in that, The inner wall of the zirconia abutment is provided with a positioning and mounting structure one, and the outer wall of the crown connection segment is provided with a positioning and mounting structure two that is adapted to the positioning and mounting structure one; one of the positioning and mounting structure one and the positioning and mounting structure two is a positioning groove, and the other is a positioning protrusion.

9. A two-stage implant, characterized in that, The implant includes an implant body and the titanium abutment as described in claim 4. The implant body has an abutment receiving cavity adapted to the fixation segment at one end near the coronal side. The opening edge of the abutment receiving cavity near the coronal side is provided with a convex arc transition structure, which can contact and cooperate with the concave arc transition structure between the fixation segment and the cuff.

10. The two-segment implant according to claim 9, characterized in that, The implant is a zirconium oxide implant.

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