A force measuring device and method for an expander

Abstract

This application relates to a force measuring device and method for an expander. The force measuring device includes a base plate, a clamping plate assembly, a force adjusting assembly, and a tension sensor. The clamping plate assembly includes a first clamping plate and a second clamping plate, which are slidably connected to the base plate along the expansion direction. The force adjusting assembly is connected to the second clamping plate along the expansion direction and is connected to the tension sensor. During force measurement, two dental mold flaps of a dental model are connected above the first and second clamping plates, respectively. A traction force is applied to the second clamping plate through the force adjusting assembly, and the tension sensor records the tension value of the force adjusting assembly in each state. This application can measure the expansion force of the expander in various states under different expansion amounts, enabling the quantification of the expansion force index. This facilitates the assessment of the optimal replacement time of the expander during the expansion process and has advantages such as simple structure and strong practicality.

Description

Technical Field

[0001] This application relates to the field of orthodontic appliance technology, and in particular to a force measuring device and method for an expander. Background Technology

[0002] Arch expanders are commonly used orthodontic appliances in the field of oral orthodontics. They can be used to correct narrow dental arches, crowded teeth, and to coordinate the width of the upper and lower dental arches.

[0003] An arch expander generally consists of a retention component that fixes the appliance to the teeth and an expansion component for expanding the arch. The elastic restoring force generated by the expansion component after being deformed by force acts on the teeth and is transmitted to the alveolar bone, which can cause the width of the upper and lower dental arches and alveolar bone to increase, thereby achieving the arch expansion effect.

[0004] Current expanders, when used clinically, can only measure the expanding force before wearing. However, the actual corrective force generated by the expander gradually changes over time, especially as orthodontic treatment progresses and a new balance is established in the dental arch and dentition system. This leads to a gradual decrease in the expander's corrective force, resulting in insufficient expansion, prolonged treatment, and hindering the progress of orthodontic work. If the expander's force were replaced with a new expander at the point when the expected expansion amount is achieved, it would maximize its corrective efficacy and improve treatment efficiency. However, currently, there is a lack of force-measuring devices in clinical practice to measure the corrective force of the expander during different expansion amounts. This makes it impossible to determine the corrective force of the expander in various states under different expansion amounts, or the optimal time to replace the expander when the dental arch has been corrected to the expected position. This necessitates relying entirely on the doctor's experience, lacking quantifiable indicators, which reduces the effectiveness of orthodontic treatment.

[0005] Therefore, when the predetermined amount of expansion is achieved, the mechanical changes of the expander during the expansion process can be measured, which is helpful in assessing the optimal timing for replacing the expander and is of great significance for improving the treatment effect. Summary of the Invention

[0006] The purpose of this application is to provide a force measuring device and method for measuring the force of the bow expander during the correction process, so as to facilitate people to know the best correction plan, thereby solving the problem that the correction force of the bow expander cannot be quantified in the prior art and the correction process needs to be estimated by the doctor's experience.

[0007] The embodiments of this application can be implemented through the following technical solutions:

[0008] A force measuring device for a bow expander is used to assemble a dental model and connect a bow expander to the dental model to measure the expanding force of the bow expander under different expanding amounts.

[0009] The force measuring device of the bow expander includes a base plate, a clamping plate assembly, and a force measuring adjustment assembly. The clamping plate assembly includes a first clamping plate and a second clamping plate. Under the action of force, the first clamping plate and the second clamping plate respectively undergo lateral displacement above the base plate. The top of the first clamping plate and the second clamping plate are respectively provided with an assembly inlet. The assembly inlet located at the front end of the second clamping plate is an arc-shaped groove. Under the action of the bow expanding force, the tooth model assembled on the clamping plate assembly opens outward.

[0010] The force adjustment component is elastically connected to the outside of the lateral displacement connection end of the second clamping plate, and the connection position is positioned by the base plate. The force adjustment component is connected to the tension sensor.

[0011] During force measurement, the two dental mold pieces of the dental model are respectively connected above the first clamp and the second clamp. The force measurement adjustment component applies traction force to the second clamp, and the tension sensor records the traction force value of the force measurement adjustment component in each state.

[0012] Furthermore, the base plate includes a displacement groove, which is a transverse through groove arranged along the length direction of the base plate. The first clamping plate includes a first connecting part, and the second clamping plate includes a second connecting part. The second connecting part is the transverse displacement connecting end of the second clamping plate. The first connecting part and the second connecting part respectively cooperate with the displacement groove to achieve a sliding connection.

[0013] Furthermore, the assembly inlet at the top of the first clamp is a first connecting structure. The first connecting structure is a blind hole structure arranged in the vertical direction. There are two first connecting structures. The two first connecting structures are respectively located below the anterior tooth position and below the posterior tooth position of the left tooth mold flap of the tooth model. The first connecting structure connected below the posterior tooth position of the tooth model is located above the first connecting part.

[0014] Furthermore, the second clamp includes an adjustment component and a rear assembly insertion hole. The assembly inlet located at the front end of the second clamp is disposed above the top of the adjustment component. The adjustment component is arranged laterally and slidably connected to the outer side of the top front end of the second clamp. By adjusting the position of the adjustment component relative to the rear assembly insertion hole, the different arch expansion amounts at the front and rear ends of the dental model can be adjusted.

[0015] The adjustment component includes a displacement slider and a first adjustment pin. The displacement slider is a slider with a connecting hole that mates with the front end of the dental model. The displacement slider is connected to the first adjustment pin.

[0016] Furthermore, the second clamping plate also includes an adjustment groove and a fixing mounting plate. The adjustment groove is a transverse sliding groove provided along the length direction of the second clamping plate. The fixing mounting plate is a panel connected to the outside of the adjustment groove. A threaded hole is provided in the middle of the fixing mounting plate. One end of the adjustment component is slidably connected to the adjustment groove, and the other end is threadedly connected to the threaded hole of the fixing mounting plate.

[0017] Furthermore, the displacement slider is slidably connected to the adjustment groove, and a front mounting hole is provided above the displacement slider. The front mounting hole is an arc-shaped sliding groove-shaped assembly entrance located at the front end of the second clamping plate. The first adjusting pin is a threaded pin, which is threadedly connected to the threaded hole of the retention mounting plate. By rotating and adjusting the connection position of the first adjusting pin relative to the retention mounting plate, the different arch expansion amounts of the front and rear ends of the dental model can be adjusted.

[0018] Furthermore, the force adjustment assembly includes a tension spring and a second adjusting pin, the tension spring and the second adjusting pin are connected, and the force adjustment assembly is elastically connected to the outside of the lateral displacement connection end of the second clamping plate through the tension spring.

[0019] Furthermore, the second clamping plate also includes a traction hole, which is located in the middle above the second connecting part. The traction hole is a connecting hole arranged along the length direction of the second clamping plate. The tension spring is housed in the traction hole, and one end of the tension spring is connected to the second clamping plate through the traction hole, while the other end is connected to the second adjusting pin.

[0020] Furthermore, the base plate also includes a connecting seat, which is a fixed seat connected to the inside and outside of the displacement groove, and the connecting seat is provided with a transverse through threaded hole in the middle.

[0021] The second adjusting pin is threaded to the connecting seat. By rotating the second adjusting pin, the connection position of the second adjusting pin relative to the connecting seat is adjusted, thereby adjusting and positioning the engagement state of the force measuring adjustment component relative to the second clamping plate.

[0022] A method for measuring the force of a bore expander, using the aforementioned bore expander force measuring device to measure the force of the expander under different expansion amounts, includes the following steps:

[0023] S1: Determine the expansion amount l1 for this forecast;

[0024] S2: Connect the two dental mold flaps of the dental model to the top of the first and second clamps respectively. Set the relative positions of the first and second clamps according to the predicted arch expansion amount l1, and adjust the position of the force adjustment component so that the spring of the force adjustment component is in a relaxed state.

[0025] S3: Adjust the position of the force-measuring assembly relative to the connecting seat by rotating it to pull the second clamping plate. When the second clamping plate moves, record the tension value displayed by the tension sensor at the moment when the second clamping plate begins to move. ,at this time, The maximum static friction force at the position node set according to the predicted expansion amount l1. ,Right now = ;

[0026] S4: Restore the relative positions of the first clamping plate and the second clamping plate to the position of the predicted expansion amount l1 determined in step S2, and keep the spring of the force adjustment component in a relaxed state, while assembling the expander.

[0027] S5: Adjust the position of the force-measuring assembly relative to the connecting seat by rotating it to pull the second clamping plate. When the second clamping plate moves, record the tension value displayed by the tension sensor at the moment when the second clamping plate begins to move. ;

[0028] S6: Determine the expanding force when the predicted expanding amount l1 is reached. , = - ;

[0029] S7: Remove the bow expander and repeat S1 to perform the force measurement operation for the next set of predicted bow expander values.

[0030] The force measuring device and method for a bow expander provided in the embodiments of this application have at least the following beneficial effects:

[0031] This application provides multiple methods for measuring the expanding force of the expander under different expanding amounts, enabling people to measure the mechanical changes of the expander during the expanding process. This facilitates timely replacement of the expander at the point when the expanding force fails, thereby improving the treatment effect and shortening the treatment process. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the decomposition state of this application in practical application;

[0033] Figure 2 This is a schematic diagram of the overall structure of a force measuring device for a bow expander according to this application;

[0034] Figure 3 This is a schematic diagram showing the exploded state of the base plate in this application;

[0035] Figure 4 This is a schematic diagram of the structure of the first clamping plate in this application;

[0036] Figure 5This is a schematic diagram of the structure of the second clamping plate in this application;

[0037] Figure 6 This is a schematic diagram of the positioning component in this application;

[0038] Figure 7 This is a schematic diagram of the force adjustment component in this application.

[0039] Numbers in the diagram

[0040] 4-Tooth model; 5-Base plate; 51-Displacement groove; 52-Connecting seat; 6-Clamping plate assembly; 61-First clamping plate; 611-First connecting part; 612-First connecting structure; 613-First assembly hole; 62-Second clamping plate; 620-Adjustment assembly; 6201-Displacement slider; 6202-First adjusting pin; 6203-Front assembly insertion hole; 6204-Adjustment mating hole; 621-Second connecting part; 622-Rear assembly insertion hole; 623-Second assembly hole; 624-Adjustment groove; 625-Traction hole; 626-Fixed mounting plate; 7-Force adjustment assembly; 71-Tension spring; 72-Second adjusting pin; 8-Tension sensor; 9-Bow expander. Detailed Implementation

[0041] The present application will now be further described based on preferred embodiments and with reference to the accompanying drawings.

[0042] In addition, for ease of understanding, various components on the drawings have been enlarged (thickened) or reduced (thinned), but this is not intended to limit the scope of protection of this application.

[0043] Singular forms of words also include plural meanings, and vice versa.

[0044] In the description of the embodiments of this application, it should be noted that the terms "upper," "lower," "inner," "outer," "front," and "rear," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships commonly used when the product of this application is in use. These 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. Furthermore, in the description of this application, the terms "first," "second," etc., are used to distinguish different units, but these are not limited by the manufacturing order, nor should they be construed as indicating or implying relative importance. Their names may differ in the detailed description and claims of this application.

[0045] The vocabulary used in this specification is for illustrative purposes and is not intended to limit the scope of this application. It should also be noted that, unless otherwise expressly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection via an intermediate medium; or they can refer to the internal communication between two components. Those skilled in the art will understand the specific meaning of these terms in this application.

[0046] For ease of description, this application uses Figure 1 Taking the directions shown as an example, the X-axis represents the horizontal direction, the Y-axis represents the front-back direction, and the Z-axis represents the up-down direction.

[0047] Figure 1 This is a schematic diagram illustrating the disassembled state of this application in practical application, such as... Figure 1 As shown, a force measuring device for a bow expander is used to assemble a tooth model 4 with a bow expander 9 connected to it, and to measure the bow expansion force transmitted to the force measuring device by the bow expander 9 under different bow expansion amounts through a connected tension sensor 8.

[0048] Figure 2 This is a schematic diagram of the overall structure of a force measuring device for a bow expander according to this application, as shown below. Figure 2 As shown, the force measuring device of the arch expander includes a base plate 5, a clamping plate assembly 6, and a force measuring adjustment assembly 7. The clamping plate assembly 6 includes a first clamping plate 61 and a second clamping plate 62. Under the action of force, the first clamping plate 61 and the second clamping plate 62 are respectively displaced laterally above the base plate 5. The top of the first clamping plate 61 and the second clamping plate 62 are respectively provided with assembly inlets for connecting the two dental mold flaps of the dental model 4. The assembly inlet located at the front end of the second clamping plate 62 is an arc-shaped groove. Under the action of arch expansion force, the dental model 4 assembled on the clamping plate assembly 6 opens outward in a fan shape.

[0049] The force adjustment component 7 is elastically connected to the outside of the lateral displacement connection end of the second clamping plate 62, and the connection position is positioned by the base plate 5. The force adjustment component 7 is connected to the tension sensor 8. When measuring force, the two dental mold flaps of the dental model 4 are respectively assembled above the first clamping plate 61 and the second clamping plate 62. At this time, the dental model 4 and the clamping plate assembly 6 are in a closed state. Then, the arch expander 9 is assembled above the dental model 4. The force adjustment component 7 applies traction force to the second clamping plate 62. The tension sensor 8 records the tension value of the force adjustment component 7 in each state.

[0050] The embodiments of this application will be described in detail below with reference to the accompanying drawings:

[0051] like Figure 1 As shown, the dental model 4 is divided into two independent dental model flaps along the midline of the dental arch. The bottom of the two dental model flaps is provided with mounting holes for connecting the first clamp 61 and the second clamp 62 respectively, so as to realize the detachable connection between the dental model 4 and the clamp assembly 6, and at the same time, the two independent dental model flaps of the dental model 4 can apply force to the first clamp 61 and the second clamp 62 respectively under the action of the arch expander.

[0052] In this embodiment, for ease of description, the side where the incisors of the tooth model 4 are located is defined as the front side, and the end of the clamp assembly 6 connected to the side of the tooth model 4 where the incisors are located is defined as the front end.

[0053] The clamping plate assembly 6 and the base plate 5 are connected by mutual matching grooves and protrusions or sliders and slide rails to achieve a sliding connection, so that the clamping plate assembly 6 is detachably connected to the base plate 5, and the first clamping plate 61 and the second clamping plate 62 can slide and move on the base plate 5 in a specified direction (i.e., the lateral bow expansion direction).

[0054] Specifically, Figure 3 This is a schematic diagram of the exploded state of the base plate in this application, as shown below. Figure 3 As shown, the base plate 5 includes a displacement groove 51, which is a transverse through groove arranged along the length direction of the base plate 5 (i.e., the transverse direction shown in the figure), so that the first clamping plate 61 and the second clamping plate 62 are respectively connected to the top of the base plate 5 and can slide and displace along the transverse direction of the base plate 5.

[0055] The base plate 5 also includes a connecting seat 52, which is a fixed seat connected to the inner and outer sides of the displacement groove 51. The connecting seat 52 has a transverse through threaded hole in the middle. After the clamping plate assembly 6 is assembled with the base plate 5, the force measuring and adjusting assembly 7 is assembled into the traction hole 625, and the connecting position of the force measuring and adjusting assembly 7 is connected and positioned through the connecting seat 52.

[0056] In some preferred embodiments, the displacement groove 51 is in the shape of a trapezoid, which is narrower at the top and wider at the bottom. Correspondingly, the first clamping plate 61 and the second clamping plate 62 are provided with protruding structures that match the shape of the groove of the displacement groove 51, so as to stably connect the bottom of the clamping plate assembly 6 to the displacement groove 51 without vertical movement.

[0057] Specifically, Figure 4 This is a schematic diagram of the structure of the first clamping plate 61 in this application. Figure 5 This is a schematic diagram of the structure of the second clamping plate 62 in this application, as shown below. Figure 4 , Figure 5As shown, the first clamping plate 61 includes a first connecting part 611, and the second clamping plate 62 includes a second connecting part 621. The first connecting part 611 and the second connecting part 621 have the same structure. The first connecting part 611 and the second connecting part 621 respectively cooperate with the displacement groove 51 to achieve a sliding connection.

[0058] In some preferred embodiments, the first clamping plate 61 further includes a first connecting structure 612, which is an assembly inlet located at the top of the first clamping plate 61. The first connecting structure 612 is a blind hole structure arranged in the vertical direction, used to connect the tooth mold flap on the left side of the tooth model 4 to the first connecting structure 612 of the first clamping plate 61 via a connecting pin.

[0059] In some preferred embodiments, two first connecting structures 612 are provided. The two first connecting structures 612 are respectively located below the anterior tooth position and below the posterior tooth position of the left dental mold flap of the dental model 4. The first connecting structure 612 connected below the posterior tooth position of the dental model 4 is located above the first connecting part 611, which is used to cooperate in connecting the dental mold flap and more effectively transmit the arch expansion force to the first clamp 61.

[0060] In some preferred embodiments, the first clamping plate 61 further includes a first mounting hole 613, and the second clamping plate 62 includes a second mounting hole 623. The first mounting hole 613 and the second mounting hole 623 have the same structure, both being through holes arranged in the vertical direction, used to connect bolts to fix the position of the clamping plate assembly 6 relative to the 5, so as to facilitate the installation of the tooth model and bow expander before testing.

[0061] The second clamp 62 includes an adjustment component 620 and a rear assembly insertion hole 622. The assembly inlet located at the front end of the second clamp 62 is disposed above the top of the adjustment component 620. The adjustment component 620 is a sliding adjustment component whose position can be adjusted along the outward expansion direction. The adjustment component 620 is arranged laterally and is slidably connected to the outer side of the top front end of the second clamp 62. The rear assembly insertion hole 622 is a blind hole structure arranged in the vertical direction. By adjusting the position of the adjustment component 620 relative to the rear assembly insertion hole 622, the different expansion amounts of the front and rear ends of the dental model 4 can be adjusted.

[0062] In some preferred embodiments, the right side of the dental model 4 is connected to the adjustment component 620 and the post-assembly insertion hole 622 respectively via connecting pins. The adjustment component 620 is connected below the anterior teeth of the right side dental model 4, and the post-assembly insertion hole 622 is located below the posterior teeth of the right side dental model 4. This is to adapt to the principle that the expansion amount of the anterior teeth is greater than that of the posterior teeth when the expander is expanding the arch, so as to facilitate the adjustment of the expansion amount of the anterior and posterior teeth according to the usage requirements, so as to meet the requirements for measuring the expansion force in various scenarios.

[0063] Furthermore, the second clamping plate 62 also includes an adjusting groove 624 and a fixing mounting plate 626. The adjusting groove 624 is a transverse sliding groove provided along the length direction of the second clamping plate 62. The fixing mounting plate 626 is a panel connected to the outside of the adjusting groove 624. A threaded hole is provided in the middle of the fixing mounting plate 626. One end of the adjusting component 620 is slidably connected to the adjusting groove 624, and the other end is threadedly connected to the threaded hole of the fixing mounting plate 626, for adjusting the transverse position of the adjusting component 620 along the bow expansion direction by rotation.

[0064] In some preferred embodiments, the first connecting structure 612 located at the posterior tooth position is above the first connecting portion 611, and the rear fitting insertion hole 622 is located above the second connecting portion 621, so that the bow expander can apply force to the clamp assembly 6 more directly and effectively when expanding the bow, in order to measure the force.

[0065] Specifically, Figure 6 This is a schematic diagram of the positioning component in this application, as shown below. Figure 6 As shown, the adjustment assembly 620 includes a displacement slider 6201 and a first adjustment pin 6202. The displacement slider 6201 is a slider with a connecting hole that engages with the front end of the tooth model 4. The displacement slider 6201 is slidably connected in the adjustment groove 624. The first adjustment pin 6202 is a threaded pin that is threadedly connected in the threaded hole of the fixing mounting plate 626. The displacement slider 6201 is movably connected to the first adjustment pin 6202. When adjusting the position, the position of 6201 relative to the fixing mounting plate 626 is adjusted by rotation, thereby driving the displacement slider 6201 to move laterally in the bow expansion direction within the adjustment groove 624.

[0066] In some preferred embodiments, the outer side of the displacement slider 6201 is provided with an adjustment hole 6204. The adjustment hole 6204 is a connecting hole for accommodating and connecting the first adjusting pin 6202. The end of the first adjusting pin 6202 and the inner edge of the adjustment hole 6204 can be connected by a mutually cooperating groove and protrusion, so that when the first adjusting pin 6202 rotates, it can drive the displacement slider 6201 to slide laterally, while avoiding driving the displacement slider 6201 to rotate.

[0067] The positioning component 620 also includes a front mounting hole 6203, which is an arc-shaped sliding groove-shaped assembly entrance located at the front end of the second clamping plate 62. The arc-shaped sliding groove of the front mounting hole 6203 is used to adapt to the expansion principle of the fan-shaped expansion bow.

[0068] The principle of fan-shaped arch expansion is as follows: Typically, the amount of expansion required for the anterior teeth (central incisors) and posterior molars differs. Based on the occlusal relationship and tooth quantity, we provide suggested expansion amounts, usually two values: the posterior expansion amount (referring to the distance the line connecting the left and right posterior molars #5 or #6 needs to be extended outwards), and the anterior expansion amount (referring to the distance the line connecting the left and right central incisors needs to be extended outwards). These two expansion amounts are mostly different, with the anterior expansion amount being larger than the posterior expansion amount. Therefore, the anterior fitting insertion hole 6203 needs to be designed in an arc shape to accommodate the expansion principle of fan-shaped arch expansion.

[0069] The front fitting insertion hole 6203 is located above the displacement slider 6201 and is used to connect the tooth mold flap on the right side of the tooth model 4 to the front fitting insertion hole 6203 via a connecting pin.

[0070] In some preferred embodiments, the adjustment groove 624 has a concave shape in the side-cutting direction, and correspondingly, the displacement slider 6201 has a convex shape in the side-cutting direction. This is used to limit the displacement slider 6201 within the adjustment groove 624 through the concave-convex fit, thereby preventing the displacement slider 6201 from moving up and down within the adjustment groove 624.

[0071] It should be added that the fan-shaped opening principle during arch expansion refers to the distance that the line connecting the left and right posterior molars #5 or #6 needs to be extended outward, and the distance that the line connecting the left and right central incisors needs to be extended outward. These two expansion amounts are mostly different, and the front expansion amount is larger than the back expansion amount.

[0072] like Figure 5As shown, the second clamping plate 62 also includes a traction hole 625, which is located in the middle above the second connecting part 621. The traction hole 625 is a connecting hole arranged along the length direction of the second clamping plate 62. The force measuring and adjusting component 7 is connected to the second clamping plate 62 through the traction hole 625, so that the second clamping plate 62 can be moved by the force measuring and adjusting component 7.

[0073] In some preferred embodiments, the first clamping plate 61 further includes a first mounting hole 613, and the second clamping plate 62 includes a second mounting hole 623. The first mounting hole 613 and the second mounting hole 623 have the same structure, both being through holes arranged in the vertical direction, used to connect bolts to fix the position of the clamping plate assembly 6 relative to the base plate 5, so as to facilitate the installation of the tooth model and bow expander before testing.

[0074] After the clamping plate assembly 6 and the base plate 5 are assembled in place, the force measuring and adjusting assembly 7 is then assembled into the traction hole 625, and the position of the force measuring and adjusting assembly 7 is connected and positioned through the connecting seat 52.

[0075] Specifically, Figure 7 This is a schematic diagram of the force adjustment component in this application, as shown below. Figure 7 As shown, the force adjustment assembly 7 includes a tension spring 71 and a second adjusting pin 72. The tension spring 71 is a spring, and the second adjusting pin 72 is a threaded pin. The force adjustment assembly 7 is elastically connected to the outside of the lateral displacement connection end of the second clamping plate 62 through the tension spring 71.

[0076] Specifically, the tension spring 71 is housed within the traction hole 625, and one end of the tension spring 71 is connected to the second clamping plate 62 through the traction hole 625, while the other end is connected to the second adjusting pin 72. The second adjusting pin 72 is threadedly connected to the connecting seat 52, and the limiting end of the second adjusting pin 72 is connected to the outside of the connecting seat 52. This allows for adjusting and positioning the connection position of the second adjusting pin 72 relative to the connecting seat 52 by rotation, thereby driving the tension spring 71 to pull the second clamping plate 62 to a different position along the bow expansion direction.

[0077] In some preferred embodiments, the second adjusting pin 72 is a hollow through structure, and the traction end of the tension sensor 8 passes through the interior of the tension spring 71 and is connected between the tension spring 71 and the second adjusting pin 72, so that the traction force applied by the force measuring and adjusting component 7 under various conditions can be recorded by the tension sensor.

[0078] The tension sensor is existing technology. A common structure of the tension sensor is that it mainly consists of a measuring system and a connecting system. During operation, the flexible steel wire rope of the connecting system is passed through the second adjusting pin 72 and connected between the tension spring 71 and the second adjusting pin 72, so that the tension sensor can record the traction force applied by the force measuring and adjusting component 7. The specific details are not further explained here.

[0079] Ideally, the relative friction between the clamp assembly 6 and the base plate 5 is very small and can be ignored. When the tooth model 4 equipped with the expander 9 is mounted on the expander force measuring device of this application, the force transmitted by the expander 9 to the force measuring adjustment assembly 7 can be measured by the sensor to obtain the expanding force of the entire expanding process. However, in practical applications, due to the influence of friction, the force transmitted by the expander 9 to the adjustment assembly 7 is much smaller than the static friction between the clamp assembly 6 and the base plate 5. Therefore, the expander force measuring device of this application can measure the expanding force applied by the expander 9 under different expanding amounts in another way.

[0080] In another aspect, this application also provides a method for measuring the force of a bow expander, using the aforementioned bow expander force measuring device to measure the expanding force of the bow expander at different expanding amounts, comprising the following steps:

[0081] S1: Determine the expansion amount l1 for this forecast;

[0082] S2: Connect the two dental mold pieces of the dental model 4 to the top of the first clamp 61 and the second clamp 62 respectively. Set the relative positions of the first clamp 61 and the second clamp 62 according to the predicted arch expansion amount l1, and adjust the position of the force adjustment component 7 so that the spring of the force adjustment component 7 is in a relaxed state.

[0083] S3: By rotating the force-measuring adjustment component 7 relative to the connecting seat 52, the second clamping plate 62 is pulled. When the second clamping plate 62 is displaced, the tension value displayed by the tension sensor 8 at the moment when the second clamping plate 62 begins to displace is recorded. ,at this time, The maximum static friction force at the position node set according to the predicted expansion amount l1. ,Right now = ;

[0084] S4: Restore the relative positions of the first clamping plate 61 and the second clamping plate 62 to the position of the predicted expansion amount l1 determined in step S2, and keep the spring of the force adjustment component 7 in a relaxed state, while assembling the expander 9.

[0085] At this time, the bow expander 9 will provide a bow expanding force in the same direction as the pulling force of the force adjustment component 7. At this time, the maximum static friction force when the second clamping plate 62 is displaced is... The force of the bow expander 9 is equal to the sum of the tension of the force-measuring and adjusting component 7. Therefore, by measuring the tension of the force-measuring and adjusting component 7 after the bow expander 9 is installed, the bow expander force of the bow expander 9 at the current bow expander position can be derived, and the following operation steps can be started accordingly:

[0086] S5: By rotating the force-measuring adjustment component 7 relative to the connecting seat 52, the second clamping plate 62 is pulled. When the second clamping plate 62 is displaced, the tension value displayed by the tension sensor 8 at the moment when the second clamping plate 62 begins to displace is recorded. ;

[0087] S6: Determine the expanding force when the predicted expanding amount l1 is reached. , = - ;

[0088] S7: Remove the bow expander 9 and repeat S1 to perform the force measurement operation for the next set of predicted bow expander quantities.

[0089] The specific embodiments of this application have been described in detail above. For those skilled in the art, several improvements and modifications can be made to this application without departing from the principle of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A force measuring device for a bow expander, used for assembling a dental model (4) and connecting a bow expander (9) to the dental model (4) to measure the bow expanding force of the bow expander (9) under different bow expanding amounts, characterized in that: The force measuring device of the bow expander includes a base plate (5), a clamping plate assembly (6), and a force measuring adjustment assembly (7). The clamping plate assembly (6) includes a first clamping plate (61) and a second clamping plate (62). Under the action of force, the first clamping plate (61) and the second clamping plate (62) respectively undergo lateral displacement along the fan-shaped bow expansion direction above the base plate (5). The top of the first clamping plate (61) and the second clamping plate (62) are respectively provided with assembly inlets. The assembly inlet located at the front end of the second clamping plate (62) is an arc-shaped groove. Under the action of the bow expansion force, the tooth model (4) assembled on the clamping plate assembly (6) opens outward. The force adjustment component (7) is elastically connected to the outside of the lateral displacement connection end of the second clamping plate (62) and the connection position is located by the base plate (5). The force adjustment component (7) is connected to the tension sensor (8). During force measurement, the two dental mold flaps of the dental model (4) are respectively connected above the first clamp (61) and the second clamp (62). The force adjustment component (7) applies traction force to the second clamp (62). The relative positions of the first clamp (61) and the second clamp (62) are set according to the predicted arch expansion amount l1, and the position of the force adjustment component (7) is adjusted so that the spring of the force adjustment component (7) is in a relaxed state. The second clamp (62) is pulled by rotating the position of the force adjustment component (7) relative to the connecting seat (52). When the second clamp (62) is displaced, the tension value displayed by the tension sensor (8) at the moment when the second clamp (62) begins to displace is recorded. ; The relative positions of the first clamp (61) and the second clamp (62) are restored to the predicted extension amount l1, and the spring of the force adjustment component (7) is kept in a relaxed state. At the same time, the extension device (9) is installed, and the second clamp (62) is pulled. When the second clamp (62) is displaced, the tension value displayed by the tension sensor (8) at the moment when the second clamp (62) begins to displace is recorded. The tension sensor (8) records the traction force value of the force adjustment component (7) under various states, thereby determining the expansion force under the predicted expansion amount l1. .

2. The force measuring device for a bow expander according to claim 1, characterized in that: The base plate (5) includes a displacement groove (51), which is a transverse through groove arranged along the length of the base plate (5). The first clamping plate (61) includes a first connecting part (611), and the second clamping plate (62) includes a second connecting part (621). The second connecting part (621) is the transverse displacement connecting end of the second clamping plate (62). The first connecting part (611) and the second connecting part (621) respectively cooperate with the displacement groove (51) to achieve a sliding connection.

3. The force measuring device for a bow expander according to claim 2, characterized in that: The assembly entrance at the top of the first clamp (61) is a first connecting structure (612). The first connecting structure (612) is a blind hole structure arranged in the vertical direction. There are two first connecting structures (612). The two first connecting structures (612) are respectively located below the anterior tooth position and below the posterior tooth position of the left tooth mold flap of the tooth model (4). The first connecting structure (612) connected below the posterior tooth position of the tooth model (4) is located above the first connecting part (611).

4. The force measuring device for a bow expander according to claim 2, characterized in that: The second clamp (62) includes an adjustment component (620) and a rear assembly insertion hole (622). The assembly inlet located at the front end of the second clamp (62) is set above the top of the adjustment component (620). The adjustment component (620) is arranged in a horizontal direction and is slidably connected to the outer side of the top front end of the second clamp (62). By adjusting the position of the adjustment component (620) relative to the rear assembly insertion hole (622), the different arch expansion amounts of the front and rear ends of the dental model (4) can be adjusted. The adjustment component (620) includes a displacement slider (6201) and a first adjustment pin (6202). The displacement slider (6201) is a slider with a connecting hole that is fitted to connect to the front end of the tooth model (4). The displacement slider (6201) is connected to the first adjustment pin (6202).

5. A force measuring device for a bow expander according to claim 4, characterized in that: The second clamping plate (62) further includes an adjustment groove (624) and a fixing mounting plate (626). The adjustment groove (624) is a transverse sliding groove provided along the length direction of the second clamping plate (62). The fixing mounting plate (626) is a panel connected to the outside of the adjustment groove (624). A threaded hole is provided in the middle of the fixing mounting plate (626). One end of the adjustment component (620) is slidably connected to the adjustment groove (624), and the other end is threadedly connected to the threaded hole of the fixing mounting plate (626).

6. The force measuring device for a bow expander according to claim 5, characterized in that: The displacement slider (6201) is slidably connected to the adjustment groove (624). A front assembly insertion hole (6203) is provided above the displacement slider (6201). The front assembly insertion hole (6203) is an arc-shaped sliding groove-shaped assembly entrance located at the front end of the second clamping plate (62). The first adjusting pin (6202) is a threaded pin. The first adjusting pin (6202) is threadedly connected to the threaded hole of the fixed mounting plate (626). By rotating and adjusting the connection position of the first adjusting pin (6202) relative to the fixed mounting plate (626), the different arch expansion amounts of the front and rear ends of the tooth model (4) can be adjusted.

7. A force measuring device for a bow expander according to claim 4, characterized in that: The force adjustment assembly (7) includes a tension spring (71) and a second adjustment pin (72). The tension spring (71) and the second adjustment pin (72) are connected together. The force adjustment assembly (7) is elastically connected to the outside of the lateral displacement connection end of the second clamping plate (62) through the tension spring (71).

8. The force measuring device for a bow expander according to claim 7, characterized in that: The second clamping plate (62) further includes a traction hole (625), which is located in the middle above the second connecting part (621). The traction hole (625) is a connecting hole arranged along the length direction of the second clamping plate (62). The tension spring (71) is housed in the traction hole (625), and one end of the tension spring (71) is connected to the second clamping plate (62) through the traction hole (625), and the other end is connected to the second adjusting pin (72).

9. A force measuring device for a bow expander according to claim 7, characterized in that: The base plate (5) also includes a connecting seat (52), which is a fixed seat connected to the inside and outside of the displacement groove (51). A transverse through threaded hole is provided in the middle of the connecting seat (52). The second adjusting pin (72) is threaded to the connecting seat (52). By rotating, the connection position of the second adjusting pin (72) relative to the connecting seat (52) is adjusted, thereby adjusting and positioning the engagement state of the force measuring adjustment component (7) relative to the second clamping plate (62).

10. A method for measuring the force of a bow expander, using a bow expander force measuring device as described in any one of claims 1-9, to measure the force of the bow expander (9) under different expansion amounts, characterized in that, Includes the following steps: S1: Determine the expansion amount l1 for this forecast; S2: Connect the two dental mold pieces of the dental model (4) to the top of the first clamp (61) and the second clamp (62) respectively. Set the relative positions of the first clamp (61) and the second clamp (62) according to the predicted arch expansion amount l1, and adjust the position of the force adjustment component (7) so that the spring of the force adjustment component (7) is in a relaxed state. S3: By rotating the force-measuring adjustment component (7) relative to the connecting seat (52), the second clamping plate (62) is pulled. When the second clamping plate (62) is displaced, the tension value displayed by the tension sensor (8) at the moment when the second clamping plate (62) begins to displace is recorded. ,at this time, The maximum static friction force at the position node set according to the predicted expansion amount l1. ,Right now = ; S4: Restore the relative positions of the first clamping plate (61) and the second clamping plate (62) to the position of the predicted bow expansion amount l1 determined in step S2, and keep the spring of the force adjustment component (7) in a relaxed state, while assembling the bow expander (9). S5: By rotating the force-measuring adjustment component (7) relative to the connecting seat (52), the second clamping plate (62) is pulled. When the second clamping plate (62) is displaced, the tension value displayed by the tension sensor (8) at the moment when the second clamping plate (62) begins to displace is recorded. ; S6: Determine the expanding force when the predicted expanding amount l1 is reached. , = - ; S7: Remove the bow expander (9) and repeat S1 to perform the force measurement operation for the next set of predicted bow expander quantities.

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