Double-crown repairing device for upper part of implant denture

Abstract

The utility model discloses a double-crown repairing device for the upper part of an implant denture, and belongs to the technical field of denture implantation. The device mainly comprises an abutment, an inner crown sleeve, an outer crown sleeve and a fastening screw, the inner crown sleeve is fixedly sleeved on the abutment through the fastening screw, the outer crown sleeve is detachably sleeved on the inner crown sleeve, and the Morse taper between the inner crown sleeve and the outer crown sleeve is 4-6 degrees, so that the inner crown sleeve and the outer crown sleeve are combined to achieve retention. The device is scientific in design, reasonable in structure, easy to operate and convenient to use, the requirement for a common positioning path is greatly reduced by using the device, and the common positioning path is actually designed in the device, so that clinicians can master the device more easily, controllability of the clinicians is greatly facilitated, sensitivity of technical requirements is reduced, and the device is suitable for popularization and application. And repairing, taking and wearing are easier, and periodontal health is protected.

Description

Technical Field

[0001] The utility model belongs to the technical field of artificial tooth implantation, in particular to an upper double-crown repair device for artificial teeth implantation. Background Art

[0002] Implant dentures are implants (artificial tooth roots) placed in the alveolar bone of the edentulous area of ​​the mouth. After the implants are established, a restoration is made on their upper end to complete the restoration of the implant dentures. It can significantly improve the chewing function of patients and feel as comfortable as real teeth. Many difficult clinical cases that are difficult to repair with conventional dentures can achieve satisfactory results with implant dentures.

[0003] The existing implant technology for the upper structure of dental implants requires that the implant placement path must be within 10 degrees due to the small taper, otherwise the later restoration cannot be completed. Even if there is an angled base, it cannot be well positioned. It requires high technical sensitivity of the doctor and the mastery of the common placement path. In addition, the existing structure is expensive, which puts a lot of financial pressure on ordinary patients. For example, the existing German Ankylos technology, because the taper is directly designed on the structural base, the base is equivalent to the inner crown, and the taper is about 5 degrees. This requires that the angles of the two implants must be implanted between 10 degrees, so the clinical operation is very difficult, the technical requirements for doctors are high, and the prospects for promotion and application are very limited. Summary of the invention

[0004] The purpose of the present invention is to solve the problems existing in the above-mentioned prior art and to provide a double-crown restoration device for the upper part of an implant denture with a completely new structural design.

[0005] The utility model is realized through the following technical solutions:

[0006] Solution 1

[0007] A double-crown restoration device for the upper part of an implant denture comprises an abutment, an inner crown sleeve, an outer crown sleeve and a fastening screw. The abutment has a truncated cone structure, and a threaded blind hole extending downward is provided at the center of the top of the abutment; the angle between the axis direction of the abutment and the vertical direction is 0°. The inner crown sleeve is sleeved on the abutment, and the inner crown sleeve has a truncated cone structure. A fixing hole is provided on the inner crown sleeve along its axis direction, which passes through the top to the bottom of the inner crown sleeve. The bottom opening of the fixing hole is in the shape of a truncated cone opening, and the inner crown sleeve is adapted to be clamped on the abutment through the truncated cone opening; the fastening screw is inserted from the top opening of the fixing hole and is threadedly connected to the threaded blind hole at the top of the abutment, and the inner crown sleeve and the abutment are fixedly connected by the fastening screw. The outer crown sleeve is mounted on the inner crown sleeve, the top end of the outer crown sleeve is closed and the bottom end is open, the outer shape of the outer crown sleeve is a truncated cone structure, the inner cavity of the outer crown sleeve is shaped like a truncated cone cavity, and the outer crown sleeve is adapted and clamped on the inner crown sleeve through the truncated cone cavity.

[0008] Solution 2

[0009] A double-crown restoration device for the upper part of an implant denture comprises an abutment, an inner crown sleeve, an outer crown sleeve and a fastening screw. The abutment has a truncated cone structure, and a threaded blind hole extending downward is provided at the center of the top of the abutment; the angle between the axis direction of the abutment and the vertical direction is 15°. The inner crown sleeve is sleeved on the abutment, and the inner crown sleeve has a truncated cone structure. A fixing hole is provided on the inner crown sleeve along its axis direction, which passes through the top to the bottom of the inner crown sleeve. The bottom opening of the fixing hole is in the shape of a truncated cone opening, and the inner crown sleeve is adapted to be clamped on the abutment through the truncated cone opening; the fastening screw is inserted from the top opening of the fixing hole and is threadedly connected to the threaded blind hole at the top of the abutment, and the inner crown sleeve and the abutment are fixedly connected by the fastening screw. The outer crown sleeve is mounted on the inner crown sleeve, the top end of the outer crown sleeve is closed and the bottom end is open, the outer shape of the outer crown sleeve is a truncated cone structure, the inner cavity of the outer crown sleeve is shaped like a truncated cone cavity, and the outer crown sleeve is adapted and clamped on the inner crown sleeve through the truncated cone cavity.

[0010] Option 3

[0011] A double-crown restoration device for the upper part of an implant denture comprises an abutment, an inner crown sleeve, an outer crown sleeve and a fastening screw. The abutment is in the shape of a truncated cone structure, and a threaded blind hole extending downward is provided at the center of the top of the abutment; the angle between the axis direction of the abutment and the vertical direction is 25°. The inner crown sleeve is sleeved on the abutment, and the inner crown sleeve is in the shape of a truncated cone structure. A fixing hole is provided on the inner crown sleeve along its axis direction, which passes through the top to the bottom of the inner crown sleeve, and the bottom opening of the fixing hole is in the shape of a truncated cone opening, and the inner crown sleeve is adapted to be clamped on the abutment through the truncated cone opening; the fastening screw is inserted from the top opening of the fixing hole and is threadedly connected to the threaded blind hole at the top of the abutment, and the inner crown sleeve and the abutment are fixedly connected by the fastening screw. The outer crown sleeve is mounted on the inner crown sleeve, the top end of the outer crown sleeve is closed and the bottom end is open, the outer shape of the outer crown sleeve is a truncated cone structure, the inner cavity of the outer crown sleeve is shaped like a truncated cone cavity, and the outer crown sleeve is adapted and clamped on the inner crown sleeve through the truncated cone cavity.

[0012] Furthermore, the bottom of the base is connected to an implant connecting rod arranged along the vertical direction.

[0013] Furthermore, the taper of the outer surface of the base is 40 degrees; the taper of the outer surface of the inner crown sleeve is 4-6 degrees, and the taper of the inner surface of the bottom end opening of the screw fixing hole is 40 degrees; the taper of the outer surface of the outer crown sleeve is 8-10 degrees, and the taper of the inner cavity surface is consistent with the taper of the outer surface of the inner crown sleeve, which is 4-6 degrees.

[0014] Furthermore, the fastening screw adopts a countersunk screw, and the upper surface of the nut is flush with the top surface of the inner crown sleeve or 0.5-1mm lower than the top surface of the inner crown sleeve.

[0015] Furthermore, the outer surface of the outer crown sleeve is evenly distributed from top to bottom with a plurality of fixed grooves.

[0016] Furthermore, the outer shape of the inner crown sleeve is a double-step truncated cone structure, the size of the upper-step truncated cone structure is smaller than that of the lower-step truncated cone structure, and the bottom of the upper-step truncated cone structure and the top of the lower-step truncated cone structure are connected by a transition of an arc segment; the shape of the inner cavity of the outer crown sleeve is a double-step truncated cone cavity, the size of the upper-step truncated cone structure is smaller than that of the lower-step truncated cone structure, and the bottom of the upper-step truncated cone structure and the top of the lower-step truncated cone structure are connected by a transition of an arc segment.

[0017] The above three schemes all provide a double-crown restoration device for the upper part of an implant denture with a completely new structural design. The structures of the three schemes are basically the same, and the only difference lies in the different deflection angles of the base. There are three types of deflection: 0°, 15° and 25°. The devices of the three schemes can be used separately or in combination according to actual needs.

[0018] The utility model device is mainly composed of three parts: abutment, inner crown sleeve and outer crown sleeve. The outer surface of the inner crown sleeve is designed to have a taper of 4-6 degrees, and the inner surface of the outer crown sleeve is designed to have a taper of 4-6 degrees. The inner and outer crown sleeves are combined to achieve a Morse taper connection, forming a relatively firm inner and outer connection retention device, which is directly applied to the upper restoration of the implant. The taper between the inner and outer crown sleeves is 4-6 degrees, and the Morse taper is 4-6 degrees, so that the inner and outer sleeves are combined to achieve retention, the teeth do not fall off, and the clinician can operate it well. The original taper of the abutment is 40 degrees. Through the use of three abutment devices with 0° deflection, 15° deflection, and 25° deflection, the two implants can be planted into, for example, 96 degrees to 159 degrees. The different abutments of 0 degrees, 15 degrees, and 25 degrees can find a common positioning path, so that clinicians can easily complete implant restorations. They can use the finished dentures to reline directly in the mouth, so that semi-fixed dentures can be easily completed without relying on the processing factory. Wearing teeth to achieve rigid retention is no different from the feeling of a real fixed bridge. Patients can remove them by themselves, brush their teeth, and do periodontal cleaning, and peri-implantitis is not easy to occur. Maintain good oral hygiene to better maintain oral health.

[0019] The device of the utility model is scientifically designed, reasonably structured, simple to operate and easy to use. The use of the device greatly reduces the requirements for a common path of insertion, and the common path of insertion has actually been designed into the device, making it easier for clinicians to master it, greatly facilitating the clinicians' operability, reducing the sensitivity of technical requirements, and making it easier to repair, remove and protect periodontal health. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the appearance structure of the device of the utility model shown in Example 1.

[0021] Figure 2 This is a schematic cross-sectional view of the device of the utility model shown in Example 1.

[0022] Figure 3 It is a schematic diagram of the cross-sectional exploded structure of the device of the utility model shown in Example 1.

[0023] Figure 4 This is a schematic cross-sectional view of the device of the utility model shown in Example 2.

[0024] Figure 5 This is a schematic diagram of the structure of the device of the utility model shown in Example 2, in which the base is deflected by 15°.

[0025] Figure 6 This is a schematic cross-sectional view of the device of the utility model shown in Example 3.

[0026] Figure 7 This is a schematic diagram of the structure of the device of the utility model shown in Example 3, in which the base is deflected by 25°.

[0027] In the figure: 1-base, 2-inner crown sleeve, 3-outer crown sleeve, 4-fastening screw, 5-threaded blind hole, 6-implant connecting rod, 7-fixing hole, 8-fixing groove. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] In the description of the present invention, it should be noted that the terms "top", "bottom", "up", "down", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention 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. Therefore, they cannot be understood as limitations on the present invention.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "setting / sleeving", "sleeve connection", "connection", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Example 1

[0031] like Figures 1 to 3 As shown, a double-crown restoration device for the upper part of an implant denture includes a base 1, an inner crown sleeve 2, an outer crown sleeve 3 and a fastening screw 4.

[0032] The base 1 has a truncated cone structure, the outer surface of the base 1 has a taper of 40 degrees, and a threaded blind hole 5 extending downward is provided at the center of the top of the base 1; the angle between the axial direction of the base 1 and the vertical direction is 0°, and the bottom of the base 1 is connected to an implant connecting rod 6 arranged along the vertical direction.

[0033] The inner crown sleeve 2 is sleeved on the base 1, and the outer shape of the inner crown sleeve 2 is a truncated cone structure. A fixing hole 7 is opened on the inner crown sleeve 2 along its axial direction, which runs from the top to the bottom. The bottom end opening of the fixing hole 7 is shaped like a truncated cone. The inner crown sleeve 2 is adapted to be clamped on the base 1 through the truncated cone opening; the fastening screw 4 is inserted from the top end opening of the fixing hole 7 and is threadedly connected with the threaded blind hole 5 at the top end of the base 1, and the inner crown sleeve 2 and the base 1 are fixedly connected by the fastening screw 4; the fastening screw 4 is a countersunk screw, and the upper surface of its nut is flush with the top surface of the inner crown sleeve 2 or 0.5-1mm lower than the top surface of the inner crown sleeve.

[0034] The outer crown sleeve 3 is mounted on the inner crown sleeve 2, the top end of the outer crown sleeve 3 is closed and the bottom end is open, the appearance of the outer crown sleeve 3 is a truncated cone structure, and the taper of the outer surface of the outer crown sleeve 3 is 8-10 degrees; the shape of the inner cavity of the outer crown sleeve 3 is a truncated cone cavity, and the taper of the inner cavity surface is consistent with the taper of the outer surface of the inner crown sleeve 2, which is also 4-6 degrees; the outer crown sleeve 3 is adapted to be clamped on the inner crown sleeve 2 through the truncated cone cavity; the outer surface of the outer crown sleeve 3 is evenly distributed with a number of fixed grooves 8 from top to bottom. Example 2

[0035] like Figures 4 to 5 As shown, a double-crown restoration device for the upper part of an implant denture includes a base 1, an inner crown sleeve 2, an outer crown sleeve 3 and a fastening screw 4.

[0036] The base 1 has a truncated cone structure, the outer surface of the base 1 has a taper of 40 degrees, and a threaded blind hole 5 extending downward is provided at the center of the top of the base 1; the angle between the axial direction of the base 1 and the vertical direction is 15°, and the bottom of the base 1 is connected to an implant connecting rod 6 arranged along the vertical direction.

[0037] The inner crown sleeve 2 is sleeved on the base 1, and the outer shape of the inner crown sleeve 2 is a truncated cone structure. The taper of the outer surface of the inner crown sleeve 2 is 4-6 degrees. A fixing hole 7 is opened on the inner crown sleeve 2 along its axial direction, which runs from the top to the bottom. The bottom end opening of the fixing hole 7 is in the shape of a truncated cone. The taper of the inner surface of the truncated cone is 40 degrees. The inner crown sleeve 2 is adapted to be clamped on the base 1 through the truncated cone opening; the fastening screw 4 is inserted from the top end opening of the fixing hole 7 and is threadedly connected with the threaded blind hole 5 at the top end of the base 1, and the inner crown sleeve 2 and the base 1 are fixedly connected by the fastening screw 4; the fastening screw 4 adopts a countersunk screw, and the upper surface of its nut is flush with the top surface of the inner crown sleeve 2 or 0.5-1mm lower than the top surface of the inner crown sleeve.

[0038] The outer crown sleeve 3 is mounted on the inner crown sleeve 2, the top end of the outer crown sleeve 3 is closed and the bottom end is open, the appearance of the outer crown sleeve 3 is a truncated cone structure, and the taper of the outer surface of the outer crown sleeve 3 is 8-10 degrees; the shape of the inner cavity of the outer crown sleeve 3 is a truncated cone cavity, and the taper of the inner cavity surface is consistent with the taper of the outer surface of the inner crown sleeve 2, which is also 4-6 degrees; the outer crown sleeve 3 is adapted to be clamped on the inner crown sleeve 2 through the truncated cone cavity; the outer surface of the outer crown sleeve 3 is evenly distributed with a number of fixed grooves 8 from top to bottom. Example 3

[0039] like Figure 6 to Figure 7 As shown, a double-crown restoration device for the upper part of an implant denture includes a base 1, an inner crown sleeve 2, an outer crown sleeve 3 and a fastening screw 4.

[0040] The base 1 has a truncated cone structure, the outer surface of the base 1 has a taper of 40 degrees, and a threaded blind hole 5 extending downward is provided at the center of the top of the base 1; the angle between the axial direction of the base 1 and the vertical direction is 25°, and the bottom of the base 1 is connected to an implant connecting rod 6 arranged along the vertical direction.

[0041] The inner crown sleeve 2 is sleeved on the base 1, and the outer shape of the inner crown sleeve 2 is a truncated cone structure. The taper of the outer surface of the inner crown sleeve 2 is 4-6 degrees. A fixing hole 7 is opened on the inner crown sleeve 2 along its axial direction, which runs from the top to the bottom. The bottom end opening of the fixing hole 7 is in the shape of a truncated cone. The taper of the inner surface of the truncated cone is 40 degrees. The inner crown sleeve 2 is adapted to be clamped on the base 1 through the truncated cone opening; the fastening screw 4 is inserted from the top end opening of the fixing hole 7 and is threadedly connected with the threaded blind hole 5 at the top end of the base 1, and the inner crown sleeve 2 and the base 1 are fixedly connected by the fastening screw 4; the fastening screw 4 adopts a countersunk screw, and the upper surface of its nut is flush with the top surface of the inner crown sleeve 2 or 0.5-1mm lower than the top surface of the inner crown sleeve.

[0042] The outer crown sleeve 3 is mounted on the inner crown sleeve 2, the top end of the outer crown sleeve 3 is closed and the bottom end is open, the appearance of the outer crown sleeve 3 is a truncated cone structure, and the taper of the outer surface of the outer crown sleeve 3 is 8-10 degrees; the shape of the inner cavity of the outer crown sleeve 3 is a truncated cone cavity, and the taper of the inner cavity surface is consistent with the taper of the outer surface of the inner crown sleeve 2, which is also 4-6 degrees; the outer crown sleeve 3 is adapted to be clamped on the inner crown sleeve 2 through the truncated cone cavity; the outer surface of the outer crown sleeve 3 is evenly distributed with a number of fixed grooves 8 from top to bottom.

[0043] For the implant denture upper double crown repair device of the above three embodiments, in order to further improve the bite force between the inner crown sleeve 2 and the outer crown sleeve 3 in the device, the outer shape of the inner crown sleeve 2 and the shape of the inner cavity of the outer crown sleeve 3 can be designed as an adaptive double-step truncated cone structure, wherein the size of the upper-step truncated cone structure is smaller than that of the lower-step truncated cone structure, the taper of the upper-step truncated cone structure and the lower-step truncated cone structure is still 4-6 degrees, and the bottom of the upper-step truncated cone structure and the top of the lower-step truncated cone structure are connected by a circular arc segment transition. In this way, after the inner cavity of the outer crown sleeve 3 is sleeved on the inner crown sleeve 2, the purpose of tighter retention can be achieved.

[0044] For the device of the utility model, a base 1 with a taper of 40 degrees is first designed, and then according to the deflection angle of the base 1, three types of devices are designed, namely, the 0° base 1 shown in Example 1, the 15° deflection base 1 shown in Example 2, and the 25° deflection base 1 shown in Example 3. Therefore, the truncated cone-shaped base 1 with a taper of 40 degrees can be in place at 360 degrees (the base is cylindrical and can also be in place at 360 degrees) with three different deflection angles. An inner crown sleeve 2 with an inner taper of 40 degrees and an outer taper of 4-6 degrees is designed on the upper part of the base 1, and the inner crown sleeve 2 is fixed on the base 1 with a fastening screw 4. An outer crown sleeve 3 with an inner taper of 4-6 degrees and an outer taper of 8-10 degrees is designed on the inner crown sleeve 2. In this way, the base 1, the inner crown sleeve 2 (inner crown), and the outer crown sleeve 3 (outer crown) are combined together. The outer surface of the outer crown sleeve 3 is increased with some retention grooves, so that the inner and outer crown sleeves 2 and 3 are buckled and tapped tightly, and tight retention can be achieved, and the teeth will not fall off in the mouth, achieving a rigid connection and a good taste, just like the effect of fixed restoration. Patients can take it off and wear it by themselves, brush their teeth well, and maintain oral health.

[0045] The utility model device is connected by three parts. Taking the 0° base 1 as an example, the taper of the base 1 is 40 degrees, the taper of one surface of the inner crown sleeve 2 is 4-6 degrees, and the two surfaces are 4-6 degrees multiplied by 2, for example, 4 degrees × 2 = 8 degrees, 4.5 degrees × 2 = 9 degrees, 5 degrees × 2 = 10 degrees, 6 degrees × 2 = 12 degrees, so that the base 1 is at least 40+8 = 48 degrees, 40+9 = 49 degrees, 40+10 = 50 degrees, and 40+12 = 52 degrees, that is to say, the angles of each implant are 48 degrees, 49 degrees, 50 degrees, and 52 degrees, and the two implants are 96 degrees, 98 degrees, 100 degrees, and 104 degrees, so the two implants are planted (48×2 = 96 degrees, 49×2 = 98 degrees, 50×2 = 100 degrees, 52×2 = 104 , 104+15*2=134 degrees. If both implants use a 15-degree angle abutment, it becomes 96+15*2=126 degrees, 98+15*2=128 degrees, 100+15*2=130 degrees, 104+15*2=134 degrees. If both implants use a 25-degree angle abutment, it becomes 96+25*2=146 degrees, 98+25*2=148 degrees, 100+25*2=150 degrees, 109+25*2=159 degrees. The two implants are planted within 96-159 degrees. Abutments of different angles can be freely matched according to actual conditions to obtain a common path of positioning. This can greatly facilitate the clinician's operability, reduce the sensitivity of technical requirements, and make it easier to repair, remove and protect the health of periodontal tissues. It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions. The sentence "includes an element defined by ..." does not exclude the existence of other identical elements in the process, method, article or device including the element".

[0046] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A double crown restoration device for implant denture, characterized in that: It includes a base, an inner crown sleeve, an outer crown sleeve and fastening screws; The abutment is a truncated cone structure, with a threaded blind hole extending downwardly provided at the center of the top of the abutment; the angle between the axis of the abutment and the vertical direction is 0°; The inner crown sleeve is sleeved on the base, and the outer shape of the inner crown sleeve is a truncated cone structure. A fixing hole is opened on the inner crown sleeve along its axial direction, which passes through the top end to the bottom end. The bottom end opening of the fixing hole is shaped like a truncated cone. The inner crown sleeve is adapted to be clamped on the base through the truncated cone opening. The fastening screw is inserted from the top end opening of the fixing hole and is threadedly connected with the threaded blind hole at the top end of the base. The inner crown sleeve and the base are fixedly connected by the fastening screw. The outer crown sleeve is mounted on the inner crown sleeve, the top end of the outer crown sleeve is closed and the bottom end is open, the outer shape of the outer crown sleeve is a truncated cone structure, the inner cavity of the outer crown sleeve is shaped like a truncated cone cavity, and the outer crown sleeve is adapted and clamped on the inner crown sleeve through the truncated cone cavity.

2. A double crown restoration device for implant denture, characterized in that: It includes a base, an inner crown sleeve, an outer crown sleeve and fastening screws; The abutment is a truncated cone structure, with a threaded blind hole extending downward at the center of the top of the abutment; the angle between the axis of the abutment and the vertical direction is 15°; The inner crown sleeve is sleeved on the base, and the outer shape of the inner crown sleeve is a truncated cone structure. A fixing hole is opened on the inner crown sleeve along its axial direction, which passes through the top end to the bottom end. The bottom end opening of the fixing hole is shaped like a truncated cone. The inner crown sleeve is adapted to be clamped on the base through the truncated cone opening. The fastening screw is inserted from the top end opening of the fixing hole and is threadedly connected with the threaded blind hole at the top end of the base. The inner crown sleeve and the base are fixedly connected by the fastening screw. The outer crown sleeve is mounted on the inner crown sleeve, the top end of the outer crown sleeve is closed and the bottom end is open, the outer shape of the outer crown sleeve is a truncated cone structure, the inner cavity of the outer crown sleeve is shaped like a truncated cone cavity, and the outer crown sleeve is adapted and clamped on the inner crown sleeve through the truncated cone cavity.

3. A double crown restoration device for implant denture upper part, characterized in that: It includes a base, an inner crown sleeve, an outer crown sleeve and fastening screws; The abutment is a truncated cone structure, with a threaded blind hole extending downward at the center of the top of the abutment; the angle between the axis of the abutment and the vertical direction is 25°; The inner crown sleeve is sleeved on the base, and the outer shape of the inner crown sleeve is a truncated cone structure. A fixing hole is opened on the inner crown sleeve along its axial direction, which passes through the top end to the bottom end. The bottom end opening of the fixing hole is shaped like a truncated cone. The inner crown sleeve is adapted to be clamped on the base through the truncated cone opening. The fastening screw is inserted from the top end opening of the fixing hole and is threadedly connected with the threaded blind hole at the top end of the base. The inner crown sleeve and the base are fixedly connected by the fastening screw. The outer crown sleeve is mounted on the inner crown sleeve, the top end of the outer crown sleeve is closed and the bottom end is open, the outer shape of the outer crown sleeve is a truncated cone structure, the inner cavity of the outer crown sleeve is shaped like a truncated cone cavity, and the outer crown sleeve is adapted and clamped on the inner crown sleeve through the truncated cone cavity.

4. The implant denture upper double crown repair device according to any one of claims 1 to 3, characterized in that: The bottom of the base is connected with an implant connecting rod arranged along the vertical direction.

5. The implant denture upper double crown repair device according to any one of claims 1 to 3, characterized in that: The taper of the outer surface of the base is 40 degrees; the taper of the outer surface of the inner crown sleeve is 4-6 degrees, and the taper of the inner surface of the bottom hole of the screw fixing hole is 40 degrees; the taper of the outer surface of the outer crown sleeve is 8-10 degrees, and the taper of the inner cavity surface is consistent with the taper of the outer surface of the inner crown sleeve, which is 4-6 degrees.

6. The implant denture upper double crown repair device according to any one of claims 1 to 3, characterized in that: The fastening screw adopts a countersunk screw, and the upper surface of the nut is flush with the top surface of the inner crown sleeve or 0.5-1mm lower than the top surface of the inner crown sleeve.

7. The implant denture upper double crown repair device according to any one of claims 1 to 3, characterized in that: The outer surface of the outer crown sleeve is evenly provided with a plurality of circle fixing grooves from top to bottom.

8. The implant denture upper double crown repair device according to any one of claims 1 to 3, characterized in that: The outer shape of the inner crown sleeve is a double-step frustoconical structure, the size of the upper-step frustoconical structure is smaller than that of the lower-step frustoconical structure, and the bottom of the upper-step frustoconical structure and the top of the lower-step frustoconical structure are connected by a circular arc segment; the shape of the inner cavity of the outer crown sleeve is a double-step frustoconical cavity, the size of the upper-step frustoconical structure is smaller than that of the lower-step frustoconical structure, and the bottom of the upper-step frustoconical structure and the top of the lower-step frustoconical structure are connected by a circular arc segment.

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