A denture fixture for missing molars

Abstract

This invention discloses a denture fixation device for missing molars, including a biomimetic fitting base, on which a denture body is assembled, and a fixing ring is fitted onto the biomimetic fitting base; two elastic clasps are provided, one end of which is connected to the fixing ring, and the other end is bent inward to form a clamping part; two shape memory alloy springs are provided, and are respectively fixedly connected to the two ends of the elastic clasps by a positioning pin mechanism; the end of the shape memory alloy spring near the adjacent tooth has an arc-shaped fitting surface; a threaded adjustment mechanism is located outside the positioning pin mechanism and is set between the shape memory alloy spring and the elastic clasps, used to adjust the clamping distance between the shape memory alloy spring and the elastic clasps. This invention solves the problem that existing clasp-retained dentures have poor versatility in practical applications because the clamping distance of the elastic clasps is fixed, making it difficult to adapt to adjacent teeth of different thicknesses and varying adjacent tooth spacing.

Description

Technical Field

[0001] This invention relates to the field of dental technology, and in particular to a denture fixation device for missing molars. Background Technology

[0002] Molars are located at the back of the mouth and are responsible for the main chewing function. When they are lost, they need to be restored through dentures to restore chewing ability and oral occlusion. Clasp-retained dentures are a common method for restoring missing molars. Retention relies primarily on the adhesion between the denture base and the alveolar ridge mucosa, as well as the clasp's holding effect on the remaining teeth. For patients with missing molars and alveolar bone resorption, a structure using flexible clasps in conjunction with a denture base is often used. This method remains one of the most commonly used restorative options in clinical practice due to its relatively low cost, wide range of indications, and lack of surgical trauma.

[0003] However, in practical applications, existing clasp-retained dentures have poor versatility because the clamping distance of the elastic clasps is fixed, making it difficult to adapt to adjacent teeth of different thicknesses and varying distances between adjacent teeth. Therefore, this invention proposes a denture fixation device for missing molars to solve the above problems. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a denture fixation device for missing molars.

[0005] To achieve the above objectives, the present invention provides a denture fixation device for missing molars, comprising: A biomimetic fitting base, wherein a denture body is assembled on the upper end face of the biomimetic fitting base, and a fixing ring is fitted on the biomimetic fitting base; Two elastic claws are provided and symmetrically distributed on both sides of the fixing ring. One end of the elastic claw is connected to the fixing ring, and the other end is bent inward to form a clamping part, which is used to clamp the adjacent teeth from the inside and provide elastic restoring force. Two shape memory alloy springs are provided, and they are respectively fixedly connected to the two ends of the elastic claws through a positioning pin mechanism. The end of the shape memory alloy spring near the adjacent tooth has an arc-shaped contact surface, which is used to contact the adjacent tooth from the outside and provide support. The threaded adjustment mechanism is located outside the positioning pin mechanism and is set between the memory alloy spring and the elastic jaw. It is used to adjust the clamping distance between the memory alloy spring and the elastic jaw to adapt to the different adjacent tooth shapes and spacings of the patient. The inner clamping force of the elastic claw and the outer supporting force of the shape memory alloy spring work together to form a bidirectional clamping fixation, which firmly clamps the denture body between the two adjacent teeth.

[0006] Furthermore, the biomimetic fitting base includes a base body, the fixing ring is sleeved on the base body, the base body is arranged in a U-shape, the base body covers the outside of the denture body, and the front and rear sides of the base body are respectively integrally formed with a plate, the plate is elastic, and the plate is tightly fitted with the alveolar ridge and surrounding oral tissues.

[0007] Furthermore, the positioning pin mechanism includes a movable plate, and a sleeve plate is sleeved on the outside of the movable plate. The end of the sleeve plate away from the movable plate is fixedly connected to a shape memory alloy spring. A positioning pin is provided on the top surface of the sleeve plate near the movable plate. Multiple positioning holes are provided at equal intervals in the horizontal direction on the top of the movable plate. The positioning pin passes through the top of the sleeve plate and extends into its interior. The movable plate is fixed by being inserted into the corresponding positioning hole by the positioning pin.

[0008] Furthermore, the positioning pin includes a positioning rod, the lower end of which is provided with an external thread, and the inner side of the positioning hole is provided with an internal thread, and the lower end of the positioning rod is threadedly inserted into the positioning hole.

[0009] Furthermore, the positioning pin also includes a limiting end, which is integrally formed on the top of the positioning rod. The diameter of the limiting end is larger than the diameter of the positioning rod. The top of the sleeve is provided with a limiting circular groove, and the limiting end is disposed in the limiting circular groove. The height of the limiting end is equal to or less than the opening depth of the limiting circular groove. The top of the limiting end is provided with a slot to facilitate screwing operation.

[0010] Furthermore, the threaded adjustment mechanism includes an internally threaded tube and an externally threaded rod. The internally threaded tube is rotatably connected to the end of an elastic pawl via a bearing. An externally threaded rod is inserted into the inner thread of the internally threaded tube, and the end of the externally threaded rod away from the internally threaded tube is fixedly connected to a shape memory alloy spring.

[0011] Furthermore, a nut is fixedly connected to the end of the internally threaded tube away from the elastic claw. The nut is threaded onto the externally threaded rod. By rotating the nut, the externally threaded rod is driven to move axially, thereby adjusting the clamping distance between the shape memory alloy spring and the elastic claw.

[0012] Furthermore, the bionic fitting base and the denture body are connected by a snap-fit ​​structure. The snap-fit ​​structure includes a support block disposed on the inner side of the lower end of the base body and a snap-fit ​​groove disposed on the side wall of the denture body. The support block is configured as multiple blocks and is evenly distributed along the inner circumference of the base body. A silicone clip is fixedly disposed on the top of the support block, and a hook structure is disposed on one side of the upper end of the silicone clip.

[0013] Furthermore, the hook structure includes a hook, which is fixedly disposed on the outer wall of the silicone block, and a hook groove that mates with the hook is provided on one side of the upper end of the snap-fit ​​groove.

[0014] Furthermore, the inner side of the clamping part of the elastic claw is provided with a first anti-slip tooth pattern, and the arc-shaped contact surface of the memory alloy spring is provided with a second anti-slip tooth pattern. The tooth shape direction of the first anti-slip tooth pattern is arranged in the vertical direction, and the tooth shape direction of the second anti-slip tooth pattern is arranged in the horizontal direction, and the two are perpendicular to each other.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention achieves precise adjustment of the clamping distance between the memory alloy spring and the elastic claw through a threaded adjustment mechanism. Combined with the elastic deformation characteristics of the elastic claw, it can adapt to different adjacent tooth spacings, has strong versatility, and effectively reduces repair costs. The inner clamping force of the elastic claw and the outer supporting force of the memory alloy spring work together to form a bidirectional clamping fixation. Combined with the anti-slip structure design where the first and second anti-slip teeth are perpendicular to each other, the friction is enhanced, making it less likely for the denture to shift or fall out during chewing.

[0016] 2. The memory alloy spring of the present invention is made of nickel-titanium memory alloy material. Its arc-shaped contact surface design matches the outer surface contour of the adjacent teeth, which can effectively disperse the clamping pressure. At the same time, the elastic restoring force of the elastic claw provides gentle and continuous inner clamping.

[0017] 3. The biomimetic fitting base of this invention adopts an integrated molding design of a U-shaped base body and an elastic plate. The plate fits the alveolar ridge and surrounding oral tissues, reducing the gap between the device and the oral tissues. The height of the limiting end of the positioning pin is equal to or less than the depth of the limiting groove, avoiding protrusion and irritation to the oral soft tissues, further improving wearing comfort.

[0018] 4. This invention achieves installation and connection between the biomimetic fitting base and the denture body through a snap-fit ​​structure. The use of the silicone clips' hooks and slots makes denture installation convenient.

[0019] 5. The elastic deformation characteristics of the elastic claws of this invention, together with the shape memory alloy springs, can effectively absorb and buffer the impact force generated by chewing, avoiding the direct transmission of rigid impact to adjacent teeth and alveolar ridges. The positioning pin mechanism, through the telescopic cooperation between the movable plate and the sleeve plate and the multi-position locking of the positioning pin, provides auxiliary fixation after the thread adjustment mechanism is adjusted, preventing the external thread rod from loosening during use. Attached Figure Description

[0020] To more clearly illustrate the solutions in this invention, the accompanying drawings used in the description of the embodiments of this invention will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a front perspective view of Embodiment 1 provided by the present invention; Figure 2 This is a bottom-view perspective view of Embodiment 1 provided by the present invention; Figure 3 This is a schematic diagram of the thread adjustment mechanism structure according to Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the positioning pin mechanism structure according to Embodiment 2 of the present invention; Figure 5 This is an enlarged schematic diagram of part A in Embodiment 2 of the present invention; Figure 6 This is a schematic diagram of the positioning pin structure in Embodiment 2 of the present invention; Figure 7 This is a partial structural diagram of the base body according to Embodiment 3 of the present invention; Figure 8 This is an enlarged schematic diagram of part B in Embodiment 3 of the present invention; Figure 9 This is a schematic diagram of the structure of Embodiment 3 provided by the present invention; Explanation of reference numerals in the attached figures: 1. Denture body; 3. Bionic fitting base; 2. Fixing ring; 31. Base body; 32. Adhesive plate; 4. Elastic claw; 5. Movable plate; 6. Sleeve plate; 7. Memory alloy spring; 8. Internally threaded tube; 9. Externally threaded rod; 10. Nut; 11. Positioning hole; 111. Internal thread; 12. Limiting groove; 13. Positioning pin; 131. Limiting end; 1311. Slot; 132. Positioning rod; 1321. External thread; 14. Hook; 15. Hook groove; 16. Silicone block; 17. Support block; 18. First anti-slip tooth pattern; 19. Second anti-slip tooth pattern; 20. Connecting groove; 21. Bearing. Detailed Implementation

[0022] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] The terms "comprising" and "having," and any variations thereof, used in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion. The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this invention are used to distinguish different objects, not to describe a particular order.

[0024] Please see Figure 1-3 A denture fixation device for missing molars includes a biomimetic fitting base 3, on which a denture body 1 is assembled. A fixing ring 2 is fitted on the biomimetic fitting base 3. The biomimetic fitting base 3 serves as the supporting foundation for the entire device and forms an integral structure through assembly and connection with the denture body 1. The fixing ring 2 is fitted on the biomimetic fitting base 3 to provide an installation fulcrum for the elastic clasp 4.

[0025] Two elastic claws 4 are provided and symmetrically distributed on both sides of the fixing ring 2. One end of the elastic claw 4 is connected to the fixing ring 2, and the other end is bent inward to form a clamping part, which is used to clamp the adjacent teeth from the inside and provide elastic restoring force. The elastic claw 4 is made of elastic material. Its inward bending clamping part is designed to utilize the elastic deformation characteristics of the material. When the device is installed between the adjacent teeth on both sides, the clamping part of the elastic claw 4 is subjected to the outward expansion of the adjacent teeth and generates elastic deformation. The deformed elastic claw 4 generates an inward elastic restoring force, which is converted into a clamping force on the inner surface of the adjacent teeth.

[0026] Two shape memory alloy springs 7 are provided and are fixedly connected to both ends of the elastic jaw 4 via a positioning pin mechanism. The end of the shape memory alloy spring 7 near the adjacent tooth has an arc-shaped contact surface, which is used to contact the adjacent tooth from the outside and provide support force. The shape memory alloy spring 7 is made of nickel-titanium shape memory alloy material, which produces controllable elastic deformation when subjected to force. The arc-shaped contact surface design matches the outer surface contour of the adjacent tooth, increasing the contact area and dispersing the contact stress. When installed, the shape memory alloy spring 7 applies an inward support force from the outside of the adjacent tooth, which forms a dual relationship with the inner clamping force of the elastic jaw 4, together constituting a two-way clamping mechanical balance system.

[0027] The threaded adjustment mechanism, located outside the positioning pin mechanism and positioned between the shape memory alloy spring 7 and the elastic jaw 4, is used to adjust the clamping distance between the shape memory alloy spring 7 and the elastic jaw 4. This clamping distance is not a fixed value but can be adapted to different adjacent tooth shapes and spacings. The threaded adjustment mechanism includes an internally threaded tube 8 and an externally threaded rod 9. The internally threaded tube 8 is rotatably connected to the end of the elastic jaw 4 via a bearing 21. The externally threaded rod 9 is inserted into the inner thread of the internally threaded tube 8. The end of the externally threaded rod 9 away from the internally threaded tube 8 is fixedly connected to the shape memory alloy spring 7. The internally threaded tube 8 is rotatably connected to the end of the elastic jaw 4 via the bearing 21. The internally threaded tube 8 and the externally threaded rod 9 form a helical transmission mechanism, utilizing the principle of thread rotation to convert rotational motion into linear motion, thereby achieving displacement control.

[0028] A nut 10 is fixedly connected to the end of the internally threaded tube 8 away from the elastic jaw 4. The nut 10 is threaded onto the externally threaded rod 9. By rotating the nut 10, the externally threaded rod 9 is driven to move axially to adjust the clamping distance between the memory alloy spring 7 and the elastic jaw 4. The nut 10 serves as the operating end. Medical staff or patients apply torque by rotating the nut 10. This torque is transmitted to the threaded pair through the internally threaded tube 8. According to the principle of screw transmission, the rotation of the nut 10 causes the externally threaded rod 9 to produce a linear displacement along the axial direction, which drives the memory alloy spring 7 to move closer to or away from the elastic jaw 4. Since the position of the elastic jaw 4 is relatively fixed, by changing the relative distance between the memory alloy spring 7 and the elastic jaw 4, it is possible to adapt to adjacent teeth of different diameters and different adjacent tooth spacings, thereby achieving personalized adaptation and adjustment.

[0029] The inner clamping force of the elastic clasp 4 and the outer supporting force of the memory alloy spring 7 work together to form a bidirectional clamping fixation, which firmly clamps the denture body 1 between the two adjacent teeth. The inner clamping force provided by the elastic clasp 4 and the outer supporting force provided by the memory alloy spring 7 mean that the two adjacent teeth are subjected to clamping force from the inside and supporting force from the outside, respectively. The two forces are equal in magnitude and opposite in direction, so that the adjacent teeth are in a state of force balance. The bidirectional clamping mechanism transmits and disperses the chewing force generated by the denture body 1 to the two adjacent teeth through the elastic clasp 4 and the memory alloy spring 7, avoiding stress concentration caused by single-point force.

[0030] Please see Figure 1-3The biomimetic fitting base 3 includes a base body 31 and a fixing ring 2 fitted on the base body 31. The base body 31 is arranged in a U-shape and covers the outside of the denture body 1. The front and rear sides of the base body 31 are integrally formed with a plate 32. The plate 32 is elastic and fits tightly with the alveolar ridge and surrounding oral tissues. The U-shaped structure of the base body 31 creates an internal space to accommodate the denture body 1 and achieve structural integration. The fixing ring 2 is fitted on the base body 31 and provides a rigid mounting reference for the elastic claw 4. The plate 32 is made of elastic material and integrally formed with the base body 31. It uses its elastic deformation ability to adapt to the irregular surface morphology of the alveolar ridge. The elastic fit generates a uniform contact pressure distribution, so that the chewing force is not only transmitted through adjacent teeth, but also part of the force can be transmitted to the alveolar ridge and surrounding oral tissues through the plate 32, realizing multi-path force dispersion and reducing the load on adjacent teeth. The connection between the base body 31 and the plate 32 is a smoothly transitioned groove. The fixing ring 2 is fitted into the groove to form a stable connection. The plate 32 extends out from below the fixing ring 2, forming an outward expansion state, which can just prevent the fixing ring 2 from falling off.

[0031] Please see Figure 4-6 The positioning pin mechanism includes a movable plate 5, with a sleeve plate 6 fitted around the movable plate 5. The end of the sleeve plate 6 away from the movable plate 5 is fixedly connected to a shape memory alloy spring 7. A positioning pin 13 is provided on the top surface of the sleeve plate 6 near the movable plate 5. Multiple positioning holes 11 are provided at equal intervals on the top of the movable plate 5. The positioning pin 13 passes through the top of the sleeve plate 6 and extends into its interior. The movable plate 5 is fixed by inserting the positioning pin 13 into the corresponding positioning hole 11. The movable plate 5 and the sleeve plate 6 form a telescopic sleeve structure. During the adjustment process of the thread adjustment mechanism, the movable plate 5 can slide axially within the sleeve plate 6 to adjust its length. When it slides to the appropriate position, the positioning pin 13 is inserted into the corresponding positioning hole 11 on the movable plate 5, and the position is locked and fixed by the pin hole cooperation. Multiple equidistant positioning holes 11 provide gear selection. After the thread adjustment mechanism is completed, the positioning pin mechanism is used for auxiliary fixation to prevent the external thread rod 9 from loosening during use.

[0032] Please see Figure 4-6 The positioning pin 13 includes a positioning rod 132. The lower end of the positioning rod 132 is provided with an external thread 1321, and the inner side of the positioning hole 11 is provided with an internal thread 111. The lower end of the positioning rod 132 is threadedly inserted into the positioning hole 11. The external thread 1321 at the lower end of the positioning rod 132 and the internal thread 111 in the positioning hole 11 form a threaded connection. The self-locking characteristic of the thread is used to prevent the positioning pin 13 from loosening when not in operation. When adjustment is required, the positioning rod 132 is rotated to disengage the external thread 1321 from the internal thread 111, and the positioning pin 13 can be pulled out for position adjustment.

[0033] The positioning pin 13 also includes a limiting end 131, which is integrally formed on the top of the positioning rod 132. The diameter of the limiting end 131 is larger than the diameter of the positioning rod 132. The top of the sleeve 6 is provided with a limiting groove 12, and the limiting end 131 is set in the limiting groove 12. The diameter of the limiting end 131 is enlarged to form a shoulder structure, which cooperates with the limiting groove 12 on the top of the sleeve 6 to limit the axial displacement range of the positioning rod 132. When the positioning rod 132 is screwed into the positioning hole 11... When the positioning rod 132 moves further down, its lower end face contacts the bottom surface of the positioning groove 12, preventing excessive screwing and damage to the movable plate 5. The height of the positioning rod 131 is equal to or less than the opening depth of the positioning groove 12. A slot 1311 is provided at the top of the positioning rod 131 to facilitate screwing operations. The height limitation of the positioning rod 131 ensures that it is completely contained within the positioning groove 12 and does not protrude from the top surface of the sleeve plate 6, thus avoiding mechanical stimulation or abrasion to the oral soft tissue. The slot 1311 is located at the top of the positioning rod 131 and can adopt a cross-groove design to cooperate with commonly used screwdrivers, making it convenient for medical staff or patients to use screwdrivers and other tools for rotation operations, realizing the quick locking and unlocking of the positioning pin 13.

[0034] Please see Figure 7-8 The biomimetic fitting base 3 and the denture body 1 are connected by a snap-fit ​​structure. The snap-fit ​​structure includes a support block 17 located on the inner side of the lower end of the base body 31 and a snap-fit ​​groove 20 located on the side wall of the denture body 1. Multiple support blocks 17 are provided and are evenly distributed along the inner circumference of the base body 31. A silicone snap block 16 is fixedly provided on the top of the support block 17. A snap hook structure is provided on one side of the upper end of the silicone snap block 16. The snap hook structure includes a snap hook 14, which is fixedly provided on the outer wall of the silicone snap block 16. A snap hook groove 15 that cooperates with the snap hook 14 is provided on one side of the upper end of the snap-fit ​​groove 20. The support blocks 17 are evenly arranged along the circumference of the base body 31 to form a multi-point support structure, so that the force is evenly distributed.

[0035] The silicone clip 16 is fixed to the top of the support block 17. When the denture body 1 is inserted into the base body 31, the silicone clip 16 is inserted into the clip groove 20. After the denture body 1 is inserted into place, the hook 14 is aligned with the hook groove 15, the silicone clip 16 elastically returns, and the hook 14 is engaged in the hook groove 15, restricting the axial displacement of the denture body 1, thus realizing the installation of the denture body 1. When it is necessary to disassemble the denture body 1, the silicone clip 16 is squeezed in the direction close to the denture body 1 using an external tool, so that the hook 14 is dislodged from the hook groove 15, thus realizing the disassembly of the denture body 1. The operation is simple and convenient.

[0036] Please see Figure 9The inner side of the clamping part of the elastic claw 4 is provided with a first anti-slip tooth pattern 18, and the arc-shaped contact surface of the memory alloy spring 7 is provided with a second anti-slip tooth pattern 19. The tooth shape direction of the first anti-slip tooth pattern 18 is arranged in the vertical direction, and the tooth shape direction of the second anti-slip tooth pattern 19 is arranged in the horizontal direction. The two are perpendicular to each other. The first anti-slip tooth pattern 18 is arranged in the vertical direction, and its tooth groove is parallel to the axis of the adjacent tooth. The tooth peak is embedded in the micro-concavity and convexity of the surface of the adjacent tooth, mainly resisting the relative slippage in the vertical direction and preventing the device from moving up and down along the axis of the adjacent tooth during chewing. The second anti-slip tooth pattern 19 is arranged in the horizontal direction, and its tooth groove is perpendicular to the axis of the adjacent tooth. It mainly resists the relative slippage in the horizontal direction and prevents the device from moving back and forth or left and right in the horizontal plane. The tooth shape directions of the first anti-slip tooth pattern 18 and the second anti-slip tooth pattern 19 are perpendicular to each other, forming a two-dimensional anti-slip network, which together improves the anti-slip ability and fixation stability of the entire denture fixation device and enhances the comfort of use in the patient's oral cavity.

[0037] The above description is only used to illustrate the technical solutions of the present invention, and is not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Any equivalent structural or procedural transformations made using the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A denture fixation device for missing molars, characterized in that, include: A bionic fitting base (3) is provided with a denture body (1) assembled on the upper end face of the bionic fitting base (3), and a fixing ring (2) is fitted on the bionic fitting base (3). Two elastic claws (4) are provided and symmetrically distributed on both sides of the fixing ring (2). One end of the elastic claw (4) is connected to the fixing ring (2), and the other end is bent inward to form a clamping part, which is used to clamp the adjacent teeth from the inside and provide elastic restoring force. Two shape memory alloy springs (7) are provided and are fixedly connected to the two ends of the elastic claw (4) by a positioning pin mechanism. The shape memory alloy spring (7) has an arc-shaped contact surface at the end near the adjacent tooth, which is used to contact the adjacent tooth from the outside and provide support. The thread adjustment mechanism is located outside the positioning pin mechanism and is set between the memory alloy spring (7) and the elastic claw (4). It is used to adjust the clamping distance between the memory alloy spring (7) and the elastic claw (4) to achieve the adaptation to different adjacent tooth shapes and distances of the patient. The inner clamping force of the elastic claw (4) and the outer supporting force of the memory alloy spring (7) work together to form a bidirectional clamping fixation, which firmly clamps the denture body (1) between the adjacent teeth on both sides.

2. The denture fixation device for missing molars according to claim 1, characterized in that: The biomimetic fitting base (3) includes a base body (31), the fixing ring (2) is sleeved on the base body (31), the base body (31) is arranged in a U-shape, the base body (31) covers the outside of the denture body (1), and the front and rear sides of the base body (31) are respectively integrally formed with a plate (32), the plate (32) is elastic, and the plate (32) is closely fitted with the alveolar ridge and surrounding oral tissues.

3. The denture fixation device for missing molars according to claim 1, characterized in that: The positioning pin mechanism includes a movable plate (5), and a sleeve plate (6) is sleeved on the outside of the movable plate (5). The end of the sleeve plate (6) away from the movable plate (5) is fixedly connected to a shape memory alloy spring (7). A positioning pin (13) is provided on the top surface of the sleeve plate (6) near the movable plate (5). Multiple positioning holes (11) are provided at equal intervals on the top of the movable plate (5). The positioning pin (13) penetrates the top of the sleeve plate (6) and extends into its interior. The movable plate (5) is fixed by being inserted into the corresponding positioning hole (11) by the positioning pin (13).

4. A denture fixation device for missing molars according to claim 3, characterized in that: The positioning pin (13) includes a positioning rod (132), the lower end of the positioning rod (132) is provided with an external thread (1321), the inner side of the positioning hole (11) is provided with an internal thread (111), and the lower end of the positioning rod (132) is threadedly inserted into the positioning hole (11).

5. A denture fixation device for missing molars according to claim 4, characterized in that: The positioning pin (13) also includes a limiting end (131), which is integrally formed on the top of the positioning rod (132). The diameter of the limiting end (131) is larger than the diameter of the positioning rod (132). The top of the sleeve plate (6) is provided with a limiting circular groove (12), and the limiting end (131) is located in the limiting circular groove (12). The height of the limiting end (131) is equal to or less than the opening depth of the limiting circular groove (12). The top of the limiting end (131) is provided with a slot (1311) to facilitate the screwing operation.

6. A denture fixation device for missing molars according to claim 1, characterized in that: The threaded adjustment mechanism includes an internal threaded tube (8) and an external threaded rod (9). The internal threaded tube (8) is rotatably connected to the end of the elastic pawl (4) via a bearing (21). The internal threaded tube (8) has an external threaded rod (9) inserted into its inner thread. The end of the external threaded rod (9) away from the internal threaded tube (8) is fixedly connected to a memory alloy spring (7).

7. A denture fixation device for missing molars according to claim 6, characterized in that: The end of the internal threaded tube (8) away from the elastic claw (4) is fixedly connected to a nut (10). The nut (10) is threaded onto the external threaded rod (9). By rotating the nut (10), the external threaded rod (9) is driven to move axially, so as to adjust the clamping distance between the memory alloy spring (7) and the elastic claw (4).

8. A denture fixation device for missing molars according to claim 1, characterized in that: The bionic fitting base (3) and the denture body (1) are connected by a snap-fit ​​structure. The snap-fit ​​structure includes a support block (17) disposed on the inner side of the lower end of the base body (31) and a snap-fit ​​groove (20) disposed on the side wall of the denture body (1). The support block (17) is configured as multiple and evenly distributed along the inner circumference of the base body (31). A silicone clip (16) is fixedly disposed on the top of the support block (17), and a hook structure is disposed on one side of the upper end of the silicone clip (16).

9. A denture fixation device for missing molars according to claim 8, characterized in that: The hook structure includes a hook (14), which is fixedly disposed on the outer wall of the silicone block (16), and a hook groove (15) that cooperates with the hook (14) is provided on one side of the upper end of the snap-fit ​​groove (20).

10. A denture fixation device for missing molars according to claim 1, characterized in that: The inner side of the clamping part of the elastic claw (4) is provided with a first anti-slip tooth pattern (18), and the arc-shaped contact surface of the memory alloy spring (7) is provided with a second anti-slip tooth pattern (19). The tooth shape direction of the first anti-slip tooth pattern (18) is arranged in the vertical direction, and the tooth shape direction of the second anti-slip tooth pattern (19) is arranged in the horizontal direction. The two are perpendicular to each other.

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