A device for adjusting and cutting the length of a gingival retraction cord in the mouth

Abstract

This application relates to the field of oral retraction technology, providing a device for adjusting and cutting the length of a retraction line intraorally. The device includes an upper body and a lower body. The lower body has a receiving cavity, and its front end has two parallel thread guide grooves. A tangent groove perpendicular to the thread guide grooves is also provided on the front end of the lower body. One end of the thread guide groove extends to the side of the lower body, and the other end extends to the receiving cavity. A telescopic adjuster with a movement direction perpendicular to the thread guide grooves is provided within the receiving cavity. A thread catcher is elastically mounted on the telescopic adjuster. Both ends of the retraction line pass through the two thread guide grooves and are caught on the telescopic adjuster by the thread catcher. A press-type cutting blade assembly is provided within the upper body. The cutting blade of the press-type cutting blade assembly is movably positioned above the tangent groove and can be inserted into the tangent groove and moved to the bottom to cut the retraction line. This device can adjust the length of the retraction line according to the current cervical circumference of the tooth and can cut it. It is convenient to operate and has good safety.

Description

Technical Field

[0001] This application belongs to the field of oral retraction technology, and more specifically, relates to a device for adjusting and trimming the length of the retraction line in the mouth. Background Technology

[0002] Currently, gingival retraction techniques are routinely used in the treatment of various fixed restorations and near-gingival fillings for tooth defects and missing teeth. For example, in clinical dental restoration, after preparing the abutment tooth, the dentist must use mechanical and / or pharmacological methods to retract the gingival margin and control the gingival crevicular fluid. This ensures that the shoulder margin of the prepared abutment tooth can be more clearly exposed, and the oral impression can accurately record the morphology of the shoulder margin of the prepared abutment tooth, thus ensuring the accuracy of the fabricated restoration.

[0003] The most commonly used method is mechanical retraction, which involves selecting an appropriate size of retraction cord based on the depth of the gingival sulcus and the thickness of the free gingiva. The cord is then wrapped around the neck of the abutment tooth. Utilizing the viscoelasticity of the gingival soft tissue, a periodontal probe or a special retraction device is used to press the cord into the gingival sulcus between the neck of the abutment tooth and the free gingiva in a clockwise or counterclockwise sequence, causing the gingiva to move laterally and apically to shrink the gingival margin.

[0004] Gingival retraction cords are typically stored in storage containers. After cutting the cord, one hand holds it with tweezers while the other hand uses a retraction device to press it into the gingival sulcus. During this procedure, the cord is often difficult to wrap neatly and stably around the gingival margin at the cervical region of the tooth, making it prone to falling off during retraction. Furthermore, because the morphology of the abutment teeth varies, dentists often rely on experience to estimate the cord length, frequently resulting in inappropriate lengths requiring multiple trimmings or recutting, leading to waste. If the cord is cut too long, the excess may even need to be cut with scissors inside the patient's mouth, potentially injuring the gums, prolonging the procedure, affecting clinical outcomes and work efficiency, and repeatedly retracting the cord exacerbates patient pain, causing gum damage and even recession. Utility Model Content

[0005] To address one of the shortcomings of the existing technology, the purpose of this application is to provide a device for adjusting and trimming the length of the retraction line in the mouth, which can adjust and trim the length of the retraction line according to the current cervical circumference of the tooth, and is easy to operate.

[0006] To achieve the above objectives, the technical solution adopted in this application is: to provide a device for adjusting and cutting the length of the gingival retraction line in the mouth, comprising: an upper body and a lower body, wherein the rear ends of the upper body and the lower body are rotatably connected so that the front end of the upper body is separated from the front end of the lower body;

[0007] The lower body has a receiving cavity, and the front end of the lower body has two parallel suture grooves. The front end of the lower body has a tangential groove perpendicular to the suture grooves, which divides the suture grooves into two sections. One end of the suture groove extends to the outer side of the lower body, and the other end extends to the receiving cavity. The receiving cavity has a telescopic adjuster with a movement direction perpendicular to the direction of the suture grooves. The telescopic adjuster is elastically equipped with a suture clamp. The two ends of the gingival retraction suture pass through the two suture grooves respectively and are clamped to the telescopic adjuster by the suture clamp.

[0008] The upper body is provided with a press-type cutting blade assembly. The cutting blade of the press-type cutting blade assembly is movably disposed above the tangent groove and can be inserted into the tangent groove and move to the bottom to cut the gingival suture in the tangent groove.

[0009] In one embodiment, the upper body and the lower body are rotatably connected by a rotating shaft, and a fixing buckle is provided on one side of the front end of the lower body. When the upper body is engaged with the fixing buckle, the upper body and the lower body overlap.

[0010] In one embodiment, the lower body includes a lower half shell and a middle shell, the middle shell and the lower half shell are snapped together, the wire groove and the tangent groove are disposed on the middle shell, the receiving cavity includes an upper receiving cavity and a lower receiving cavity, the lower receiving cavity is disposed on the lower half shell, and the upper receiving cavity is disposed on the middle shell and communicates with the lower receiving cavity.

[0011] In one embodiment, the telescopic adjuster includes: a movable plate, the front end of which is provided with two wire-clamping grooves spaced apart, and the bottom of the wire-clamping grooves is provided with a first mounting hole for movably mounting the wire clamp; the bottom of the movable plate is provided with an elastic abutment member, which elastically abuts against the wire clamp so that the wire clamp abuts against one side wall of the wire-clamping groove to clamp the gingival cord; the rear end of the movable plate is provided with a threaded rod, and a rotating tube is threadedly connected to the threaded rod, one end of which is rotatably clamped to the rear end face of the lower body; when the rotating tube rotates, it can drive the threaded rod to move, thereby driving the movable plate to move within the accommodating cavity.

[0012] In one embodiment, the elastic abutment includes a connecting plate protruding from the bottom of the movable plate, a mounting shaft disposed on the connecting plate, and a first spring sleeved on the mounting shaft, one end of the first spring abutting against the connecting plate and the other end abutting against the wire clamp.

[0013] In one embodiment, the wire clamp includes a wire clamping plate, a pushing block, and a connecting block. Two wire clamping plates are provided, each movably disposed in a corresponding wire clamping groove. The two wire clamping plates are disposed on the connecting block, which is located below the bottom of the movable plate. A toggle groove is provided on the side of the lower body. The pushing block passes through the toggle groove and is connected to the connecting block. The pushing block partially protrudes from the side of the lower body. The first spring abuts against the connecting block.

[0014] In one embodiment, the lower half shell and the middle shell are provided with semi-circular holes at their rear ends, and a limiting ring groove is provided on one end of the rotating tube. The two semi-circular holes are joined together to form a docking hole, which is used to rotate and engage the limiting ring groove.

[0015] In one embodiment, the press-type cutting assembly includes: an upper elastic pressure plate, a lower elastic pressure plate, a second spring, a button, and a pin; the pin is connected to the upper body, the front end of the upper elastic pressure plate is fixedly connected to the pin and has a protrusion at the front end that abuts against the lower elastic pressure plate, the rear end of the upper elastic pressure plate is movably sleeved on the rotating shaft, the front end of the lower elastic pressure plate is provided with the cutting blade, the rear end of the lower elastic pressure plate is sleeved on the rotating shaft, the lower elastic pressure plate is inclined with its front end higher and its rear end lower, and the middle part of the lower elastic pressure plate is movably sleeved on the pin; the upper body has a second mounting hole, the button is movably mounted in the second mounting hole and inserted into the rotating shaft.

[0016] In one embodiment, a second spring is sleeved on the rotating shaft, and the second spring is located between the upper elastic pressure plate and the lower elastic pressure plate.

[0017] In one embodiment, the pin is a semi-cylindrical head screw, and the pin is threadedly connected to a threaded post inside the upper body.

[0018] The beneficial effects of the device provided in this application for adjusting and trimming the length of the gingival retraction line intraorally are as follows:

[0019] When using this method, first cut a section of retraction cord with a diameter longer than the circumference of the tooth neck. Then, pass both ends through the cord groove and clamp them onto the telescopic adjuster. Next, place the retraction cord over the tooth neck and adjust its length using the telescopic adjuster to ensure it fits snugly. Press part of the retraction cord into the gingival sulcus, then use the press-type cutting tool to cut the adjusted cord. Finally, gradually press the remaining retraction cord into the gingival sulcus. This method is convenient to operate, easy to cut, does not cause gum damage, is safe, and adaptable to different teeth. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A three-dimensional structural schematic diagram of the device for adjusting and trimming the length of the gingival retraction line intraorally, as provided in an embodiment of this application;

[0022] Figure 2 A frontal plan view of the device for adjusting and trimming the length of the gingival retraction line intraorally, as provided in an embodiment of this application.

[0023] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0024] Figure 4 A rear view schematic diagram of the device for adjusting and trimming the length of the gingival retraction line intraorally, as provided in an embodiment of this application.

[0025] Figure 5 An exploded structural diagram of the device for adjusting and trimming the length of the gingival retraction line intraorally, as provided in an embodiment of this application;

[0026] Figure 6 The schematic diagram of the device for adjusting and cutting the length of the gingival retraction line in the oral cavity, provided in the embodiments of this application, omitting the upper body and the press-type cutting blade assembly;

[0027] Figure 7 for Figure 6 Enlarged view of point B in the middle;

[0028] Figure 8 A schematic diagram of the lower main body of the device for adjusting and trimming the length of the gingival retraction line intraorally, as provided in an embodiment of this application;

[0029] Figure 9 A partial structural diagram of the telescopic adjuster in the device for adjusting and trimming the length of the gingival retraction line intraorally, provided in an embodiment of this application.

[0030] Figure 10 for Figure 9 Enlarged view of point C in the middle;

[0031] Figure 11 This is a partial structural diagram of the press-type cutter assembly in the device for adjusting and cutting the length of the gingival retraction line intraorally, as provided in an embodiment of this application.

[0032] Figure 12A schematic diagram of the suture clamp in the device for adjusting and cutting the length of the gingival retraction line in the oral cavity, provided in an embodiment of this application;

[0033] Figure 13 A cross-sectional view of the button in the device for adjusting and trimming the length of the gingival retraction line in the oral cavity, provided in an embodiment of this application.

[0034] Figure 14 This is a cross-sectional view of the rotating tube in the device for adjusting and cutting the length of the gingival retraction line in the oral cavity, as provided in the embodiments of this application.

[0035] The following are the labeling elements in the figure:

[0036] 1. Upper body; 11. Second mounting hole; 2. Lower body; 21. Lower half shell; 211. Lower receiving cavity; 212. Actuating groove; 22. Middle shell; 221. Wire passage groove; 222. Wire cutting groove; 223. Upper receiving cavity; 23. Fixing buckle; 24. Snap-fit ​​hole; 3. Telescopic adjuster; 31. Movable plate; 311. Wire clamping groove; 312. First mounting hole; 313. Connecting plate; 314. Mounting shaft; 315. First spring; 2. Threaded rod; 33. Rotating tube; 331. Limiting ring groove; 4. Wire clamp; 41. Wire clamping plate; 42. Push block; 43. Connecting block; 44. Guide groove; 5. Press-type cutter assembly; 51. Cutting blade; 52. Upper elastic pressure plate; 521. Protrusion; 522. First through hole; 53. Lower elastic pressure plate; 531. Second through hole; 54. Second spring; 55. Button; 551. Insertion hole; 56. Pin; 6. Rotating shaft. Detailed Implementation

[0037] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0038] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0039] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0041] like Figures 1-14 As shown in the illustration, a device for adjusting and cutting the length of gingival retraction cord intraorally, according to an embodiment of this application, will now be described. This device for adjusting and cutting the length of gingival retraction cord intraorally includes an upper body 1 and a lower body 2, which are rotatably connected to facilitate the installation of the gingival retraction cord. The rear ends of the upper body 1 and the lower body 2 are rotatably connected to separate the front ends of the upper body 1 and the lower body 2, allowing the upper body 1 and lower body 2 to open and the front ends to be used for installing the gingival retraction cord.

[0042] In this embodiment, the lower body 2 has a receiving cavity, and the front end of the lower body 2 has two parallel grooving grooves 221. The front end of the lower body 2 has a tangential groove 222 perpendicular to the grooving grooves 221. The tangential groove 222 divides the grooving grooves 221 into two segments. One end of the grooving groove 221 extends to the side of the lower body 2, and the other end extends to the receiving cavity. Thus, the two ends of the cut gingival retraction cord can be inserted into the receiving cavity through the grooving grooves 221 respectively. In this embodiment, the sum of the lengths of the two grooving grooves 221 near the outer side of the lower body 2 is the same as the center distance between the two grooving grooves 221. The center distance between the two grooving grooves 221 is the length of the cervical region occupied by the outer side of the lower body 2 after it is attached to the cervical region. Thus, after the outer side of the lower body 2 is placed against the cervical region, when the gingival retraction cord is cut, its effective length remaining in the grooving groove 221 is equal to the length of the cervical region occupied by the lower body 2, so that the two ends of the gingival retraction cord can form a ring at the cervical region. Specifically, the cavity is equipped with a telescopic adjuster 3 whose direction of movement is perpendicular to the direction of the thread groove 221. A thread clamp 4 is elastically mounted on the telescopic adjuster 3. The thread clamp 4 is used to hold both ends of the retraction cord on the telescopic adjuster 3. When the telescopic adjuster 3 moves away from the thread groove 221, it moves the retraction cord, thereby shortening the length of the retraction cord portion outside the lower body 2, thus achieving the purpose of adjusting the length of the retraction cord. When installing the retraction cord, a longer portion of the retraction cord is first cut, ensuring that its length is greater than the circumference of the cervical region of the tooth. Both ends of the retraction cord pass through the two thread grooves 221 and are then clamped onto the telescopic adjuster 3 by the thread clamp 4. The curved portion of the retraction cord remains outside the lower body 2 for fitting with the cervical region of the tooth. After the retraction cord is fitted with the cervical region of the tooth, the telescopic adjuster 3 moves the retraction cord inside the lower body 2 according to the circumference of the cervical region, thereby shortening the length of the retraction cord outside the lower body 2, making the retraction cord fit snugly against the cervical region of the tooth.

[0043] In this embodiment, the upper body 1 is provided with a press-type cutting blade assembly 5. The cutting blade 51 of the press-type cutting blade assembly 5 is movably disposed above the tangent groove 222 and can be inserted into the tangent groove 222 and move to the bottom wall to cut the gingival suture in the tangent groove 221. The press-type cutting component 5 rotates synchronously with the upper body 1, facilitating the installation of the retraction cord. After the upper body 1 and the lower body 2 overlap, the cutting blade 51 is positioned directly above the tangent groove 222. The length of the tangent groove 222 is greater than the length of the cutting blade 51, and the height of the cutting blade 51 is greater than the depth of the tangent groove 222, ensuring that the blade of the cutting blade 51 can be inserted to the bottom of the groove to cut the retraction cord. After the length of the retraction cord is adjusted to the correct position, first press the portion of the retraction cord on the outer side of the lower body 2 into the gingival sulcus, and then press down the press-type cutting component 5 so that the cutting blade 51 is inserted into the tangent groove 222 to cut the retraction cord. After the retraction cord is cut, remove the device from the oral cavity, and then gradually press the remaining retraction cord into the gingival sulcus. This ensures that the retraction cord will not easily move when pressed into the gingival sulcus.

[0044] Specifically, such as Figure 4 and Figure 5 As shown, the upper body 1 and the lower body 2 are rotatably connected by a rotating shaft 6, which is located at the rear end of the lower body 2. A fixing buckle 23 is provided on one side of the front end of the lower body 2. When the upper body 1 is engaged with the fixing buckle 23, the upper body 1 and the lower body 2 overlap. When the upper body 1 rotates toward the side away from the fixing buckle 23, the upper body 1 separates from the lower body 2.

[0045] like Figure 5-9 As shown, the lower body 2 includes a lower shell 21 and a middle shell 22. The middle shell 22 and the lower shell 21 are connected by several snap-fit ​​structures. The wire groove 221 and the tangent groove 222 are provided on the front end of the middle shell 22. The accommodating cavity includes an upper accommodating cavity 223 and a lower accommodating cavity 211. The lower accommodating cavity 211 is provided on the lower shell 21. The upper accommodating cavity 223 is provided on the middle shell 22 and is adapted to and connected to the lower accommodating cavity 211. The lower shell 21 and the middle shell 22 can be detachably assembled for the purpose of facilitating the installation of the telescopic adjuster 3.

[0046] Specifically, the telescopic adjuster 3 includes: a movable plate 31, which is slidably disposed within the accommodating cavity; two wire-holding grooves 311 are spaced apart at the front end of the movable plate 31; the bottom of the wire-holding grooves 311 is provided with a first mounting hole 312 for movably mounting the wire holder 4; the bottom of the movable plate 31 is provided with an elastic abutment, which elastically abuts against the wire holder 4 so that the wire holder 4 abuts against one side wall of the wire-holding groove 311 to clamp the gingival retraction cord. Specifically, both ends of the gingival retraction cord are first inserted through the wire groove 221, and then the wire holder 4 is separated from the side wall of the wire-holding groove 311. At this time, the elastic abutment is in a compressed state. Then, both ends of the gingival retraction cord are inserted between the wire holder 4 and the side wall of the wire-holding groove 311. The elastic abutment is released, and the wire holder 4 abuts against the side wall of the wire-holding groove 311 under the elastic force of the elastic abutment to clamp the gingival retraction cord.

[0047] In this embodiment, the rear end of the movable plate 31 is provided with a threaded rod 32, and a rotating tube 33 is threadedly connected to the threaded rod 32. The rear end face of the lower body 2 is provided with a snap-fit ​​hole 24. One end of the rotating tube 33 is rotatably snapped onto the rear end face of the lower body 2 through the snap-fit ​​hole 24. The rotating tube 33 is located on the outside of the lower body 2 for easy operation by the user. The rotating tube 33 is a hollow tube with an internal thread that is threadedly connected to the threaded rod 32. When the rotating tube 33 rotates, it can drive the threaded rod 32 to move. When the threaded rod 32 moves to the outside of the rear end of the lower body 2, it drives the movable plate 31 to move within the accommodating cavity. At the same time, the movable plate 31 moves, driving the suture clamp 4 to move. Since the gingival retraction suture is clamped by the suture clamp 4, the gingival retraction suture moves synchronously into the lower body 2, making the length of the curved part located on the outside of the lower body 2 shorter, so as to achieve the purpose of adjusting the length of the gingival retraction suture.

[0048] In this embodiment, as Figure 2 , Figure 3 and Figure 10 As shown, the elastic abutment includes a connecting plate 313 protruding from the bottom of the movable plate 31, a mounting shaft 314 disposed on the connecting plate 313, and a first spring 315 sleeved on the mounting shaft 314. One end of the first spring 315 abuts against the connecting plate 313, and the other end abuts against the wire clamp 4. The first spring 315 is used to drive the wire clamp 4 to abut against the side wall of the wire clamping groove 311.

[0049] like Figure 7 and 12 As shown, the wire clamp 4 includes a wire clamping plate 41, a pushing block 42, and a connecting block 43. Two wire clamping plates 41 are provided, each movably mounted in a corresponding wire clamping groove 311. The two wire clamping plates 41 pass through the first mounting hole 312 and are mounted on the connecting block 43. The connecting block 43 is located below the bottom of the movable plate 31. A toggle groove 212 is provided on the side of the lower body 2. The pushing block 42 passes through the toggle groove 212 and connects to the connecting block 43. Part of the pushing block 42 protrudes from the side of the lower body 2. A first spring 315 abuts against the connecting block 43. The wire clamping plate 41 and the pushing block 42 are detachably connected to the connecting block 43, either by plugging or screwing, facilitating the assembly of the wire clamp 4 onto the movable plate 31 and the lower body 2. The pushing block 42 protrudes from the side of the lower body 2 to facilitate the user's movement of the wire clamp 4 within the wire clamping groove 311. This creates a gap between the wire clamping plate 41 and the side wall of the wire clamping groove 311, allowing for easy insertion of the gingival retraction suture. At this time, the first spring 315 is compressed. After releasing the pushing force on the pushing block 42, the first spring 315 returns to its original position, causing the wire clamp 4 to automatically reset, allowing the wire clamping plate 41 to abut against the side wall of the wire clamping groove 311 to hold the gingival retraction suture. For a firmer grip, the side wall of the wire clamping groove 311 and the wire clamping plate 41 can be made with rough surfaces to increase friction. In this embodiment, the connecting block 43 has a guide groove 44 for the insertion of the mounting shaft 314. When the pushing block 42 causes the connecting block 43 to compress the first spring 315, the mounting shaft 314 is inserted into the guide groove 44, providing guidance for the movement of the connecting block 43.

[0050] like Figure 6 and 14 As shown, in this embodiment, the lower shell 21 and the middle shell 22 are provided with semi-circular holes at their rear ends. The two semi-circular holes are joined together to form a snap-fit ​​hole 24. One end of the rotating tube 33 is provided with a limiting ring groove 331. The two semi-circular holes are joined together to form a snap-fit ​​hole 24 and are used to rotate and snap-fit ​​the limiting ring groove 331. The limiting ring groove 331 cooperates with the snap-fit ​​hole 24, so that the rotating tube 33 can only rotate at the snap-fit ​​hole 24. When rotating, it will automatically drive the threaded rod 32 to move, thereby achieving the purpose of adjusting the length of the gingival retraction line. The operation is simple.

[0051] In this embodiment, as Figure 5 and Figure 11 As shown, the press-type cutting assembly includes: an upper elastic pressure plate 52, a lower elastic pressure plate 53, a second spring 54, a button 55, and a pin 56. The pin 56 is connected to the upper body 1. The front end of the upper elastic pressure plate 52 is fixedly connected to the pin 56, and the front end has a protrusion 521 that abuts against the lower elastic pressure plate 53. The rear end of the upper elastic pressure plate 52 has a first through hole 522, through which it is movably sleeved on the rotating shaft 6. The size of the first through hole 522 is larger than the diameter of the rotating shaft 6. The first through hole 522 can be an oblong hole to ensure that the upper elastic pressure plate 52 can move in an arc shape when pressed down. The front end of the lower elastic pressure plate 53 has a cutting blade 51. The rear end is provided with a second through hole 531. The lower elastic pressure plate 53 is sleeved on the rotating shaft 6 through the second through hole 531 and its rear end is attached to the middle shell. The lower elastic pressure plate 53 is inclined and its front end is higher than its rear end, with the front end being suspended. The middle part of the lower elastic pressure plate 53 is movably sleeved on the pin shaft 56. The middle part of the lower elastic pressure plate 53 is provided with a waist-shaped hole to ensure that the lower elastic pressure plate 53 can move up and down normally. The upper body 1 is provided with a second mounting hole 11. The button 55 is movably installed in the second mounting hole 11 and is inserted into the rotating shaft 6. When the button 55 is pressed, the button 55 moves downward on the rotating shaft 6 and applies a downward pressure to the upper elastic pressure plate 52. This causes the protrusion 521 of the upper elastic pressure plate 52 to apply a downward pressure to the middle part of the lower elastic pressure plate 53. Therefore, the lower elastic pressure plate 53 will deform and move downward with its rear end as the support point, simultaneously driving the cutting blade 51 to insert into the cutting groove 222 to cut the gingival line. To ensure the automatic rebound of the upper elastic pressure plate 52, a second spring 54 is sleeved on the rotating shaft 6. The second spring 54 is located between the upper elastic pressure plate 52 and the lower elastic pressure plate 53. The second spring 54 can also press the rear end of the lower elastic pressure plate 53 against the middle shell, ensuring that the rear end of the lower elastic pressure plate 53 rotates only horizontally. In this embodiment, the button 55 is hollow inside, and a insertion hole 551 is provided on the bottom for the rotating shaft 6 to be inserted, providing space for the rotating shaft 6 to be accommodated when the button 55 is pressed down. The size of the insertion hole 551 is smaller than the size of the second spring 54, thus ensuring that the second spring 54 is compressed when the button is pressed. The button 55 has an inverted T-shaped structure, and the button 55 is installed in the second mounting hole 11 from the inside out, so that the button 55 will not detach from the upper body under the elastic force of the second spring 54, while also ensuring that it can be pressed down. The front end of the upper elastic pressure plate 52 can be fixed to the pin 56 by welding. Alternatively, a hook can be provided on the side of the pin 56, and a hanging hole can be provided on the upper elastic pressure plate 52, which can be hooked and fixed with the hook.

[0052] In this embodiment, the pin 56 is a semi-cylindrical head screw, and the upper body 1 is provided with a threaded post with an internal threaded hole. The semi-cylindrical head screw is threadedly connected to the threaded post.

[0053] In this embodiment, the device is small in size and can stably fix both ends of the retraction cord. The fixed retraction cord is looped around the neck of the tooth in a circular shape. At the same time, the doctor can directly determine the appropriate length of the retraction cord based on the condition of the patient's teeth. If the length of the retraction cord is not appropriate, it can be adjusted directly in the patient's mouth until it is suitable. Ultimately, the retraction cord can be neatly and stably wrapped around the neck of the patient's tooth, preventing the retraction cord from falling off and avoiding waste caused by multiple cuttings of the retraction cord. This facilitates the doctor's retraction operation and improves the efficiency of the operation.

[0054] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A device for adjusting and trimming the length of the gingival retraction line intraorally, characterized in that, include: The upper body (1) and the lower body (2) are rotatably connected at their rear ends so that the front end of the upper body (1) is separated from the front end of the lower body (2); The lower body (2) is provided with a receiving cavity. The front end of the lower body (2) is provided with two parallel thread grooves (221). The front end of the lower body (2) is provided with a tangential groove (222) perpendicular to the thread grooves (221). The tangential groove (222) divides the thread grooves (221) into two sections. One end of the thread grooves (221) extends to the outer side of the lower body (2), and the other end extends to the receiving cavity. The receiving cavity is provided with a telescopic adjuster (3) whose movement direction is perpendicular to the direction of the thread grooves (221). The telescopic adjuster (3) is elastically provided with a thread clamp (4). The two ends of the gingival retraction thread pass through the two thread grooves (221) respectively and are clamped by the thread clamp (4) onto the telescopic adjuster (3). The upper body (1) is provided with a press-type cutting blade assembly (5). The cutting blade (51) of the press-type cutting blade assembly (5) is movably arranged above the tangent groove (222) and can be inserted into the tangent groove (222) and move to the bottom to cut the gingival suture in the suture groove (221).

2. The device for adjusting and trimming the length of the gingival retraction line intraorally as described in claim 1, characterized in that: The upper body (1) and the lower body (2) are rotatably connected by a rotating shaft (6). A fixing buckle (23) is provided on one side of the front end of the lower body (2). When the upper body (1) is engaged with the fixing buckle (23), the upper body (1) and the lower body (2) overlap.

3. The device for adjusting and trimming the length of the gingival retraction line intraorally as described in claim 2, characterized in that: The lower body (2) includes a lower shell (21) and a middle shell (22), the middle shell (22) and the lower shell (21) are snapped together, the wire groove (221) and the tangent groove (222) are disposed on the middle shell (22), the accommodating cavity includes an upper accommodating cavity (223) and a lower accommodating cavity (211), the lower accommodating cavity (211) is disposed on the lower shell (21), and the upper accommodating cavity (223) is disposed on the middle shell (22) and communicates with the lower accommodating cavity (211).

4. The device for adjusting and trimming the length of the gingival retraction line intraorally as described in claim 3, characterized in that: The telescopic adjuster (3) includes: a movable plate (31), the front end of which is provided with two wire-clamping grooves (311) spaced apart, and the bottom of the wire-clamping grooves (311) is provided with a first mounting hole (312) for movably mounting the wire clamp (4); the bottom of the movable plate (31) is provided with an elastic abutment, which elastically abuts against the wire clamp (4) so ​​that the wire clamp (4) abuts against one side wall of the wire-clamping groove (311) to clamp the gingival cord; the rear end of the movable plate (31) is provided with a threaded rod (32), and a rotating tube (33) is threadedly connected to the threaded rod (32), one end of which is rotatably clamped onto the rear end face of the lower body (2); when the rotating tube (33) rotates, it can drive the threaded rod (32) to move, so as to drive the movable plate (31) to move within the accommodating cavity.

5. The device for adjusting and trimming the length of the gingival retraction line intraorally as described in claim 4, characterized in that: The elastic abutment includes a connecting plate (313) protruding from the bottom of the movable plate (31), a mounting shaft (314) disposed on the connecting plate (313), and a first spring (315) sleeved on the mounting shaft (314). One end of the first spring (315) abuts against the connecting plate (313), and the other end abuts against the wire clamp (4).

6. The device for adjusting and trimming the length of the gingival retraction line intraorally as described in claim 5, characterized in that: The wire clamp (4) includes a wire clamping plate (41), a pushing block (42), and a connecting block (43). Two wire clamping plates (41) are provided, and each wire clamping plate (41) is movably disposed in the corresponding wire clamping groove (311). The two wire clamping plates (41) are disposed on the connecting block (43). The connecting block (43) is located below the bottom of the movable plate (31). The side of the lower body (2) is provided with a toggle groove (212). The pushing block (42) passes through the toggle groove (212) and is connected to the connecting block (43). The pushing block (42) partially protrudes from the side of the lower body (2). The first spring (315) abuts against the connecting block (43).

7. The device for adjusting and trimming the length of the gingival retraction line intraorally as described in claim 5, characterized in that: The lower shell (21) and the middle shell (22) are provided with semi-circular holes at their rear ends. One end of the rotating tube (33) is provided with a limiting ring groove (331). The two semi-circular holes are joined together to form a docking hole (24) and are used to rotate and engage the limiting ring groove (331).

8. The device for adjusting and trimming the length of the gingival retraction line intraorally as described in any one of claims 2-7, characterized in that: The press-type cutter assembly (5) includes: an upper elastic pressure plate (52), a lower elastic pressure plate (53), a second spring (54), a button (55), and a pin (56); the pin (56) is connected to the upper body (1), the front end of the upper elastic pressure plate (52) is fixedly connected to the pin (56) and the front end is provided with a protrusion (521) that abuts against the lower elastic pressure plate (53), and the rear end of the upper elastic pressure plate (52) is movably sleeved on the rotating shaft (6). The cutting blade (51) is provided at the front end of the lower elastic pressure plate (53), and the rear end of the lower elastic pressure plate (53) is sleeved on the rotating shaft (6). The lower elastic pressure plate (53) is inclined and the front end is high and the rear end is low. The middle part of the lower elastic pressure plate (53) is movably sleeved on the pin (56). The upper body (1) is provided with a second mounting hole (11). The button (55) is movably installed in the second mounting hole (11) and inserted into the rotating shaft (6).

9. The device for adjusting and trimming the length of the gingival retraction line intraorally as described in claim 8, characterized in that: A second spring (54) is sleeved on the rotating shaft (6), and the second spring (54) is located between the upper elastic pressure plate (52) and the lower elastic pressure plate (53).

10. The device for adjusting and trimming the length of the gingival retraction line intraorally as described in claim 8, characterized in that: The pin (56) is a semi-cylindrical head screw, and the pin (56) is threadedly connected to the threaded column inside the upper body (1).

Images