Stress measuring device for dental restoration body bonded structure and method of use

Abstract

To provide a stress measuring device for a dental restoration body bonded structure and a method of use.SOLUTION: A stress measuring device for a dental restoration body bonded structure includes a first load assembly and a second load assembly having the same structure. The first load assembly and the second load assembly are assembled by a central symmetry scheme. A dental restoration body bonded structure is assembled between the first load assembly and the second load assembly. The first load assembly and the second load assembly are each installed with several load holes 72. Load blocks 1, 10 are assembled in different load holes 72 to conduct a dynamic performance test in a different tensile / shear combined stress state for the dental restoration body bonded structure, and thereby allowing measurement of breakage strength in the different tensile / shear combined stress state.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to the technical field of stress measuring devices, and more particularly to a stress measuring device for dental restoration adhesive structures and a method of use thereof. [Background technology]

[0002] During practical application, the adhesive gel layer of the dental restoration is mainly subjected to various types of stresses, including shear stress, tensile stress, compressive stress and bending stress. Here, for shear stress, when the restoration and the tooth surface are subjected to shear stress, the shear stress is transmitted by the adhesive gel layer, and the shear stress is parallel to the contact surface. Tensile stress occurs in the adhesive gel layer between the restoration and the tooth surface, and when the restoration is pulled, tensile stress occurs in the adhesive gel layer; compressive stress occurs when the restoration and the tooth surface are subjected to the action of compressive stress, and bending stress occurs in the adhesive gel layer when the restoration is bent. These stresses may interact with each other and cause complex stress distribution, which may affect the stability of the adhesive gel layer and the life of the dental restoration. Therefore, when selecting and using an adhesive, it is necessary to consider the effects of these stresses and ensure that the selected adhesive can provide stable adhesion under different types of stress.

[0003] Because the adhesive gel layer between the tooth restoration and the tooth is relatively thin, the normal force mainly generates a normal tensile stress perpendicular to the adhesive gel layer, the shear force mainly generates a tangential shear stress parallel to the adhesive gel layer, and the stress components generated in the adhesive gel layer by other forces are also mainly the normal tensile stress and tangential shear stress of the adhesive gel layer. Therefore, it is necessary to use the normal tensile stress and tangential shear stress of the adhesive gel layer as the evaluation basis for checking the strength of the adhesive structure, and test the fracture strength of the adhesive gel layer under different tensile shear stress conditions.

[0004] The usual method for testing the adhesive strength of dental restorations is the shear adhesive strength test. Among them, the adhesive test specimen manufacturing device is used to manufacture adhesive performance test samples, and the specimen is fixed on a special fixture of a universal material testing machine, and the load head is adjusted to make it adhere to the adhesive gel layer of the dentin, and the direction of the load force is parallel to the adhesive gel layer until the restoration is peeled off from the tooth surface, and the test machine automatically records the force value at the time of the specimen's fracture. The above method mainly tests the shear performance of dental restoration adhesive structures. And the adoption of this standard adhesive structure requires very high manufacturing requirements to ensure that the direction of the load force is parallel to the adhesive gel layer. If there is a processing error during the manufacturing of the adhesive structure, the load force will not be parallel to the adhesive gel layer, and the adhesive gel layer will be crowded with the force, which will greatly affect the accuracy of the test.

[0005] At present, there is no corresponding test equipment that can perform mechanical performance tests under different tensile-shear combined stress conditions on dental restoration adhesive structures, and how to test the stress of dental restoration adhesive structures has become an urgent problem that needs to be solved. Summary of the Invention

[0006] The present invention aims to provide a stress measuring device and a method for using a dental restoration adhesive structure in response to the technical deficiency currently existing in the prior art, that is, there is no corresponding test device capable of performing mechanical performance tests under different tensile-shear combined stress conditions on a dental restoration adhesive structure.

[0007] In order to achieve the above object, the technical solutions adopted by the present invention are as follows: A dental restoration adhesive structure stress measuring device, comprising a first load assembly and a second load assembly of the same structure, the first load assembly and the second load assembly being assembled in a centrosymmetric manner, and a dental restoration adhesive structure being assembled between the first load assembly and the second load assembly; The first load assembly includes two first arc-shaped steel pieces arranged in parallel, the two first arc-shaped steel pieces being removably connected, the second load assembly includes two second arc-shaped steel pieces arranged in parallel, the two second arc-shaped steel pieces being removably connected, A first groove is provided on a right-angle side of the first circular arc-shaped steel piece, a second groove is provided on a right-angle side of the second circular arc-shaped steel piece, and the dental restoration bonding structure is provided between the first groove and the second groove; Both the first arc-shaped steel piece and the second arc-shaped steel piece have multiple load holes along the circumferential direction of the arc, and by connecting load blocks to the load holes at different positions, it is possible to apply loads at different angles to the dental restoration adhesive structure.

[0008] The technical solution of the present invention provides a dental restoration adhesive structure stress measurement device, which is provided with two interlocking load assemblies with multiple load holes, so that the load blocks can be fitted with the load holes at different positions, and realizes the mechanical performance test under different tensile-shear combined stress states for the dental restoration adhesive structure, and tests the fracture strength under different tensile-shear combined stress states, providing abundant and accurate data support for the strength check of the adhesive gel layer.

[0009] As a preferred technical solution of the present invention, the dental restoration bonding structure includes an extracted tooth and an adhesive block that is vertically bonded to the top surface of the extracted tooth, and further includes a rectangular container for embedding the extracted tooth, wherein the adhesive block is installed on the first load assembly side, and the rectangular container is installed on the second load assembly side.

[0010] Specifically, an extracted tooth is taken, the long axis of the tooth is rinsed with running water, the enamel layer is uniformly polished away, and a complete dentin bonding test specimen is prepared. The extracted tooth is embedded in resin in a rectangular container, and after the resin material is hardened, the exposed dentin is polished with sandpaper to obtain a relatively smooth bonding surface.

[0011] An adhesive block is manufactured using 3D printing or machining, adhesive is applied to the adhesive area on the upper surface of the extracted tooth, and the adhesive block is vertically bonded to the adhesive area on the upper surface of the extracted tooth to form a dental restoration adhesive structure.

[0012] As a preferred technical solution of the present invention, the adhesive block is installed between two first arc-shaped steel pieces, the adhesive block is installed on the first groove side, and the adhesive block is fixed to the first arc-shaped steel piece by a first connecting pin; the rectangular container is installed between two second arc-shaped steel pieces, the rectangular container is installed on the second groove side, and the rectangular container is fixed to the second arc-shaped steel piece by a second connecting pin.

[0013] In a preferred technical solution of the present invention, a first stopper assembly is installed on the first load assembly to limit the position of the adhesive block, the first stopper assembly includes a first stopper block and a first stopper clamp block, and the adhesive block is installed between the first stopper block and the first stopper clamp block; A second stopper assembly is provided on the second load assembly for limiting the position of the rectangular container, the second stopper assembly including a second stopper block and a second stopper clamp block, and the rectangular container is provided between the second stopper block and the second stopper clamp block.

[0014] As a preferred technical solution of the present invention, the first stopper block and the second stopper block are both fan-shaped, the angle between the fan-shaped shapes is 90°, the first stopper block and the first arc-shaped steel piece are connected by at least two first fasteners, and the second stopper block and the second arc-shaped steel piece are connected by at least two first fasteners.

[0015] In a preferred technical solution of the present invention, the first stopper clamp block has a rectangular shape, a first strip-shaped slit parallel to the side wall of the adhesive block is provided on a side of the first stopper clamp block closer to the adhesive block, the length of the first strip-shaped slit is shorter than the length of the first stopper clamp block, a first adjustment bolt is further provided on the first stopper clamp block, the adjustment bolt is provided horizontally penetrating the first stopper clamp block, and the first adjustment bolt adjusts the slit width of the first strip-shaped slit to achieve accurate positioning of the adhesive block.

[0016] As a preferred technical solution of the present invention, the structure of the second stopper clamp block is the same as that of the first stopper clamp block, a second strip-shaped slit and a second adjusting bolt are installed in the second stopper clamp block, and the second adjusting bolt adjusts the slit width of the second strip-shaped slit to achieve accurate positioning of the rectangular container.

[0017] As a preferred technical solution of the present invention, the first stopper clamp block and the first arc-shaped steel piece are connected by at least two second fasteners, and the second stopper clamp block and the second arc-shaped steel piece are fixed by at least two second fasteners.

[0018] The first fastener and the second fastener are both fastening bolts, and are used to ensure the stability of the connection of the first stopper assembly or the second stopper assembly and the accuracy of the stopper.

[0019] During the tensile test, the adhesive block mainly applies pressure to the stopper clamp block. If there is a gap between the stopper clamp block and the adhesive block, it will affect the force-receiving mode of the adhesive gel layer. In the preferred mode of the present invention, a strip-shaped slit is provided in the stopper clamp block that is parallel to the adhesive block or the rectangular container, and the strip-shaped slit is processed by wire cutting or machining, and the stopper clamp block is brought close to the adhesive block side to form a sheet structure, and the strip-shaped slit does not completely pass through the stopper clamp block, and a rotating bolt is further provided on the side of the stopper clamp block to fine-tune the sheet structure, thereby realizing accurate positioning of the adhesive block.

[0020] As a preferred technical solution of the present invention, the first load assembly includes at least one first load block, and a plurality of first load holes are provided on the first arc-shaped steel piece, and the first load block can be assembled with any one of the first load holes, and the first load block is used to apply loads to different angles of the dental restoration bonding structure; The second load assembly includes at least one second load block, and a plurality of second load holes are provided in the second arc-shaped steel piece, and the second load block can be assembled with any one of the second load holes, and the second load block is used to apply loads to different angles of the dental restoration bonding structure.

[0021] As a preferred technical proposal of the present invention, the first load block is sandwiched between two of the first arc-shaped steel pieces, and the first load block can be connected to any one of the first load holes by a third connecting pin, and the second load block is sandwiched between two of the second arc-shaped steel pieces, and the second load block can be connected to any one of the second load holes by a fourth connecting pin.

[0022] The first load block and the second load block are used to connect a tensile tester.

[0023] More preferably, the first loading assembly includes two first loading blocks, each of which is fitted with a different first loading hole, and the two first loading blocks are used to simultaneously load different angles of the dental restoration bonding structure; the second loading assembly includes two second loading blocks, each of which is fitted with a different second loading hole, and the two second loading blocks are used to simultaneously load different angles of the dental restoration bonding structure; Here, the center of the first arc-shaped steel piece overlaps with the center of the second arc-shaped steel piece. The two first load blocks and the two second load blocks are rotationally symmetrical by 180° around the center of the arc-shaped steel piece, where the two first load blocks are denoted by A1 and A2, the two second load blocks are denoted by B1 and B2, and the line connecting the central axes of A1 and B1 passes through the center of the arc-shaped steel piece, and the line connecting the central axes of A2 and B2 passes through the center of the arc-shaped steel piece. The first load block and the second load block are used to apply loads at different angles to the dental restoration bonding structure.

[0024] Preferably, when the two first load blocks and the two second load blocks are respectively connected to a tensile testing machine, a load can be applied and the tensile stress and shear stress received inside the adhesive gel layer can be controlled to any value, thereby simulating the load-bearing state of the adhesive structure under any stress state.

[0025] When the two first load blocks are each connected to a tensile testing machine, the two second load blocks are also connected to the tensile testing machine at the same time, and a tensile force is applied in the direction of the line connecting the central axes of the first load block A1 and the second load block B1, and a dynamic load is applied in the direction of the line connecting the central axes of the first load block A2 and the second load block B2, thereby simulating the stress state in a special case where a tensile force is applied in one direction and a fatigue load is applied in another direction at the same time.

[0026] As a preferred technical solution of the present invention, a first U-shaped connecting member is connected to the outside of the first load block, a second U-shaped connecting member is connected to the outside of the second load block, connecting bolts are respectively installed at the tops of the first U-shaped connecting member and the second U-shaped connecting member, and the connecting bolts are used to connect a tensile testing machine.

[0027] Preferably, loading of K (K>2) first load blocks and loading of K (K>2) second load blocks may be performed, where the K>2 first load blocks are represented by (A1, A2, A3...), and the K>2 second load blocks are represented by (B1, B2, B3...); In such cases, the above is used to simulate more specific stress situations. In the case of K=3, a tensile force is applied in the direction of the line connecting the central axes of A1 and B1, a tensile force is applied in the direction of the line connecting the central axes of A2 and B2, and a dynamic load is applied in the direction of the line connecting the central axes of A3 and B3. The application angles of multiple stresses also affect the magnitude of tensile stress and shear stress, and the angular relationship between multiple sets of load blocks can be analyzed and combined with the formula to obtain the values ​​of tensile stress and shear stress.

[0028] A method for using the stress measuring device for a dental restoration adhesive structure includes the following steps: Step 1: prepare a dental restoration adhesive structure, the adhesive block forms an adhesive gel layer with the top surface of the extracted tooth, and the area of ​​the adhesive gel layer is represented by the letter B. Specifically, the extracted tooth is first taken, washed with water and embedded in resin to obtain a rectangular container for embedding the extracted tooth, and a standard adhesive area is prepared on the top surface of the extracted tooth, the adhesive area is located at the center of the top surface of the extracted tooth, adhesive is applied to the adhesive area on the top surface of the extracted tooth, and the adhesive block is centered and bonded vertically to the adhesive area on the top surface of the extracted tooth, and the adhesive area is B; Step 2: Connect the dental restoration adhesive structure to the first load assembly and the second load assembly, respectively, specifically, fix the adhesive block between the two first arc-shaped steel pieces by a first connecting pin, and fix the rectangular container in which the extracted tooth is embedded between the two second arc-shaped steel pieces by a second connecting pin; Specifically, some of the first load holes are arranged in a counterclockwise direction as φ1, φ2, . . . , φ n and φ n The projected linear distance from the center of the circle of the adhesive gel layer to the center of the circle O is L n Define it as: The center of the load hole φ1 is located on the same plane as the middle surface of the adhesive gel layer. If the center point O of the middle surface of the adhesive gel layer and the center of φ1 are connected, a projection straight line L1 is obtained. n-3 If you connect the centers of the circles, the projection line L n-3 We obtain L n-3 The angle between L1 and L2 is α, and α can take different angles according to the tensile shear stress state (different ratios of tensile stress and shear stress). The adhesive strength of the adhesive gel layer when the ratio of tensile stress to shear stress is tan(α) can be tested respectively. Step 3: Adjust the position of the first load block in the first load hole and the position of the second load block in the second load hole, and connect both ends of the first load assembly and the second load assembly to both ends of a tensile tester respectively, to perform a strength test of the adhesive gel layer; Step 4, a), when the number K of the first load block and the second load block are both 1, change the load-receiving angle of the dental restoration adhesive structure, and perform strength tests of the adhesive gel layer under different tensile shear stress states, and record the failure load F and the area B of the adhesive gel layer, and obtain the failure strength of the adhesive gel layer under stress state; In the formula, S is the fracture strength of the adhesive gel layer, F is the fracture load, and B is the area of ​​the adhesive gel layer. The tensile stress applied to the adhesive gel layer is defined as M, and the shear stress applied to the adhesive gel layer is defined as N, where: In the JPEG2024176996000003.jpg13170 formula, α is L n and L1, M is the tensile stress applied to the adhesive gel layer, N is the shear stress applied to the adhesive gel layer, Ln is the projected linear distance from the center of φn to the center O of the adhesive gel layer, and L1 represents the linear distance between φ1 and point O, where φ1 is located in the same plane as the mid-surface of the adhesive gel layer, b) When the number K of the first load block and the second load block is both 2, The load force of A1 and B1 is represented by F1, the angle between the direction of the line connecting the central axes of A1 and B1 and L1 is represented by α, the load force of A2 and B2 is represented by F2, the angle between the direction of the line connecting the central axes of A2 and B2 and L1 is represented by β, the tensile stress received by the adhesive gel layer is M st and the shear stress acting on the adhesive gel layer is defined as N st Define it as: JPEG2024176996000004.jpg26170JPEG2024176996000005.jpg10170More preferably, when A1 and B1 are simultaneously loaded, the load force is F1, and when A2 and B2 are simultaneously loaded, the load force is a sinusoidal fatigue load F3; It is obtained as follows: JPEG2024176996000006.jpg8170JPEG2024176996000007.jpg12170

[0029] The above equation is a sine function where the average value of the load determines the horizontal offset of the function, the amplitude of the load determines the vertical offset and amplitude magnitude of the function, and the phase angle determines the horizontal translation of the function.

[0030] If the angle between the direction of the line connecting the central axes of A1 and B1 and L1 is α, and the angle between the direction of the line connecting the central axes of A2 and B2 and L1 is β, the tensile stress applied to the adhesive gel layer is M dy and the shear stress acting on the adhesive gel layer is defined as N dy Define it as: JPEG2024176996000008.jpg27170JPEG2024176996000009.jpg11170

[0031] The fracture strength of dental restoration adhesive structures was measured under the combined action of current dynamic tensile stress and dynamic shear stress.

[0032] Preferably, in the test device, the multiple first loading holes can be designed in an arc-shaped slot structure, and the positional relationship of the first loading block in the arc-shaped slot can be arbitrarily adjusted to adjust the angle with the adhesive gel layer. Similarly, the multiple second loading holes can also be designed in an arc-shaped slot structure.

[0033] As described above, by adopting the above technical solution, the beneficial effects of the present invention are as follows: 1. The technical solution of the present invention provides a stress measuring device for dental restoration adhesive structure, which is equipped with multiple load holes on two interlocking load assemblies, so that the load blocks can be fitted with the load holes at different positions, and realizes the mechanical performance test under different tensile-shear combined stress states for the dental restoration adhesive structure, and tests the fracture strength under different tensile-shear combined stress states, providing abundant and accurate data support for the strength check of the adhesive gel layer.

[0034] 2. The measuring device of the present invention manufactures an adhesive structure consisting of a rectangular container in which an extracted tooth is embedded and an adhesive block, and places an adhesive gel layer in the middle, which is further fitted with a circular arc-shaped steel plate structure to ensure that the force always passes through the center of the middle surface of the adhesive gel layer during tension, and makes the internal force-bearing of the adhesive gel layer more uniform.

[0035] 3. The measuring device of the present invention uses the pin to position the adhesive structure, and the stopper block and the stopper clamp block can better realize the stopper function of the adhesive structure, and ensure the force applied to the inside of the adhesive gel layer during tension more stably. The axes of the pins at the upper and lower ends of the load block form a 90° angle to form a universal joint-like structure, so that the semicircular steel piece and the structure in the middle part can only bear vertical forces. [Brief description of the drawings]

[0036] [Figure 1] 1 is a structural schematic diagram of a measuring device of the present invention; [Diagram 2] FIG. 2 is a schematic diagram of the structure of a circular arc-shaped steel plate with the top surface of one layer removed from the measuring device of the present invention. [Diagram 3] 1 is a schematic diagram showing how the measuring device of the present invention changes the position of a hole in a circular-arc steel piece and further changes the force-receiving angle of an adhesive gel layer. [Figure 4] FIG. 2 is a schematic diagram showing the measurement device of the present invention realizing seven different loads on the adhesive gel layer by installing seven load holes on the arc-shaped steel piece. [Diagram 5] 5 is a schematic diagram of the mechanical performance test of the adhesive gel layer of the measuring device of the present invention under different stress conditions, where Fig. 5(a) is a shear strength test, where α=0° and the ratio of tensile stress to shear stress is 0, Fig. 5(b) is a combined tensile-shear strength test, where α=45° and the ratio of tensile stress to shear stress is 1, and Fig. 5(c) is a tensile strength test, where α=90° and the ratio of tensile stress to shear stress is +∞. [Figure 6] FIG. 2 is a structural schematic diagram of a dental restoration adhesive structure. [Figure 7] 4 is a structural schematic diagram of a first stopper clamp block of the measuring device of the present invention. FIG. [Figure 8] 10 is a schematic diagram showing stress measurement performed when the number K of the first load block and the number K of the second load block in the present invention are both equal to 2. FIG. [Figure 9]10 is a schematic diagram showing stress measurement performed when the number K of the first load block and the number K of the second load block in the present invention are both 3. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0037] <Example 1> The present invention provides a stress measuring device for a dental restoration adhesive structure, which includes a first load assembly and a second load assembly of the same structure, as shown in Figures 1-7, the first load assembly and the second load assembly are assembled in a centrosymmetric manner, and a dental restoration adhesive structure is assembled between the first load assembly and the second load assembly. More specifically, as shown in Figure 6, the dental restoration adhesive structure includes an extracted tooth 5 and an adhesive block 12 vertically adhered to the top surface of the extracted tooth, and further includes a rectangular container 13 for embedding the extracted tooth 5, the adhesive block 12 is installed on the first load assembly side, and the rectangular container 13 is installed on the second load assembly side.

[0038] The first load assembly includes two first arc-shaped steel pieces 2 arranged in parallel, and the two first arc-shaped steel pieces 2 are detachably connected; the second load assembly includes two second arc-shaped steel pieces 7 arranged in parallel, and the two second arc-shaped steel pieces 7 are detachably connected; a first groove 21 is provided on the right-angle side of the first arc-shaped steel piece 2, and a second groove 71 is provided on the right-angle side of the second arc-shaped steel piece 7; and the dental restoration adhesive structure is provided between the first groove 21 and the second groove 71; Specifically, the adhesive block 12 is installed between two first arc-shaped steel pieces 2, the adhesive block 12 is installed on the first groove 21 side, and the adhesive block 12 is fixed to the first arc-shaped steel piece 2 by a first connecting pin 9, and the rectangular container 13 is installed between two second arc-shaped steel pieces 7, the rectangular container 13 is installed on the second groove 71 side, and the rectangular container 13 is fixed to the second arc-shaped steel piece 7 by a second connecting pin 15.

[0039] a first stopper assembly for limiting the position of the adhesive block 12 is provided on the first load assembly, the first stopper assembly including a first stopper block 61 and a first stopper clamp block 62, and the adhesive block 12 is provided between the first stopper block 61 and the first stopper clamp block 62; A second stopper assembly for limiting the position of the rectangular container 13 is installed on the second load assembly, the second stopper assembly including a second stopper block 81 and a second stopper clamp block 82, and the rectangular container 13 is installed between the second stopper block 81 and the second stopper clamp block 82.

[0040] The first stopper block 61 and the second stopper block 81 are both fan-shaped, and the angle between the fan shapes is 90°. The first stopper block 61 and the first arc-shaped steel piece 2 are connected by at least two first fasteners 63, and the second stopper block 81 and the second arc-shaped steel piece 7 are connected by at least two first fasteners 63.

[0041] The first stopper clamp block 62 has a rectangular shape, and a first strip-shaped slit 621 is provided on the side of the first stopper clamp block 62 close to the adhesive block 12, the length of the first strip-shaped slit 621 is shorter than the length of the first stopper clamp block 62, and a first adjustment bolt 622 is further provided on the first stopper clamp block 62, the adjustment bolt 622 is provided horizontally penetrating the first stopper clamp block 62, and the first adjustment bolt 622 adjusts the slit width of the first strip-shaped slit 621 to accurately position the adhesive block 12. As shown in FIG. 2 and FIG. 7.

[0042] The structure of the second stopper clamp block 82 is the same as that of the first stopper clamp block 62, and a second strip-shaped slit 821 and a second adjustment bolt 822 are installed in the second stopper clamp block 82, and the second adjustment bolt 822 adjusts the slit width of the second strip-shaped slit 821 to realize accurate positioning of the rectangular container 13, as shown in FIG. 2.

[0043] The first stopper clamp block 62 and the first arc-shaped steel piece 2 are connected by at least two second fasteners 83, and the second stopper clamp block 82 and the second arc-shaped steel piece 7 are fixed by at least two second fasteners 83.

[0044] The first fastener 63 and the second fastener 83 are both fastening bolts, and are used to ensure the stability of the connection of the first stopper assembly or the second stopper assembly and the accuracy of the stopper.

[0045] The first arc-shaped steel piece 2 and the second arc-shaped steel piece 7 each have a plurality of load holes along the circumferential direction of the arc, and load blocks are connected to the load holes at different positions to realize the application of loads at different angles to the dental restoration bonding structure. Specifically, the first load assembly includes a first load block 1, the first arc-shaped steel piece 2 has a plurality of first load holes 22, the first load block 1 can be assembled with any one of the first load holes 22, and the first load block 1 is used to apply loads at different angles to the dental restoration bonding structure; The second load assembly includes a second load block 10, and a plurality of second load holes 72 are installed on the second arc-shaped steel piece 7, and the second load block 10 can be assembled with any one of the second load holes 72, and the second load block 10 is used to apply loads to different angles of the dental restoration adhesive structure.

[0046] More specifically, the first load block 1 is sandwiched between two of the first arc-shaped steel pieces 2, and the first load block 1 can be connected to any one of the first load holes 22 by a third connecting pin 111, and the second load block 10 is sandwiched between two of the second arc-shaped steel pieces 7, and the second load block 10 can be connected to any one of the second load holes 72 by a fourth connecting pin 101.

[0047] The first load block 1 and the second load block 10 are used to connect to a tensile tester. Specifically, a first U-shaped connection member 16 is connected to the outside of the first load block 1, a second U-shaped connection member 17 is connected to the outside of the second load block 10, and a connection bolt 19 is installed on the top of the first U-shaped connection member 16 and the second U-shaped connection member 17, respectively, and the connection bolt is used to connect to a tensile tester.

[0048] <Example 2> This embodiment provides a stress measuring device for dental restoration adhesive structure, the structure is basically the same as that of embodiment 1, the only difference is that in this embodiment, the number of first load blocks is two, designated as A1 and A2, the number of second load blocks is two, designated as B1 and B2, the two first load blocks and the two second load blocks are rotationally symmetrical by 180° around the center of the arc-shaped steel piece. As shown in Fig. 8, the line connecting the central axes of A1 and B1 passes through the center of the arc-shaped steel piece, and the line connecting the central axes of A2 and B2 passes through the center of the arc-shaped steel piece.

[0049] A tensile force is applied in the direction of the line connecting the central axes of A1 and B1, and a tensile force or dynamic load is applied in the direction of the line connecting the central axes of A2 and B2. The application angles of multiple stresses also affect the magnitude of tensile stress and shear stress, and the angular relationship between multiple sets of load blocks is analyzed and combined with the calculation formula to obtain the numerical values ​​of tensile stress and shear stress. The stress measuring device of this embodiment is used to simulate the load-bearing situation of the adhesive structure under any stress state.

[0050] <Example 3> This embodiment provides a stress measuring device for dental restoration adhesive structure, the structure is basically the same as that of embodiment 1, but the only difference is that in this embodiment, the number of first load blocks is three, which are designated as A1, A2 and A3, and the number of second load blocks is also three, which are designated as B1, B2 and B3, and the three first load blocks and the three second load blocks are 180° rotationally symmetrical around the center of the arc-shaped steel piece. As shown in FIG. 9, the line connecting the central axes of A1 and B1 passes through the center of the arc-shaped steel piece, the line connecting the central axes of A2 and B2 passes through the center of the arc-shaped steel piece, and the line connecting the central axes of A3 and B3 passes through the center of the arc-shaped steel piece. The stress measuring device of this embodiment is used to simulate more specific stress situations, A tensile force is applied in the direction of the line connecting the central axes of A1 and B1, a tensile force is applied in the direction of the line connecting the central axes of A2 and B2, and a dynamic load is applied in the direction of the line connecting the central axes of A3 and B3. The application angles of multiple stresses also affect the magnitude of tensile stress and shear stress, and the angular relationships between multiple sets of load blocks are analyzed and combined with the formula to obtain the values ​​of tensile stress and shear stress.

[0051] <Example 4> This embodiment provides a method for using the stress measuring device for dental restoration adhesive structure, specifically including the following steps: Step 1: Prepare a dental restoration adhesive structure, and the adhesive block 12 and the top surface of the extracted tooth 5 form an adhesive gel layer 18. The area of ​​the adhesive gel layer 18 is specifically represented by the letter B. First, take the extracted tooth 5, wash it with water and embed it in resin to obtain a rectangular container 13 for embedding the extracted tooth 5. Prepare an adhesive area on the top surface of a standard extracted tooth 5. The adhesive area is located at the center of the top surface of the extracted tooth 5. Apply adhesive to the adhesive area on the top surface of the extracted tooth. Then, use the adhesive block 12 as the center and bond it vertically to the adhesive area on the top surface of the extracted tooth to form an adhesive gel layer 18. Step 2: Connect the dental restoration adhesive structure to the first load assembly and the second load assembly, respectively. Specifically, the adhesive block 12 is fixed between the two first arc-shaped steel pieces 2 by the first connecting pin 9, and the rectangular container 13 in which the extracted tooth 5 is embedded is fixed between the two second arc-shaped steel pieces 7 by the second connecting pin 15; Specifically, the first load holes 22 are arranged in counterclockwise order as φ1, φ2, . . . , φ n Specifically, as shown in FIG. 3, n The projected linear distance from the center of the circle of the adhesive gel layer 18 to the center O of the circle is L n The center of the first load hole φ1 is located on the same plane as the middle surface of the adhesive gel layer 18, and a projection line L1 is obtained by connecting the center point O of the middle surface of the adhesive gel layer 18 and the center of φ1. n-3 If you connect the centers of the circles, the projection line L n-3 We obtain L n-3 The angle between L1 and L2 is α, and α can take different angles according to the tensile shear stress state (different ratios of tensile stress and shear stress), and the adhesive strength of the adhesive gel layer 18 when the ratio of tensile stress to shear stress is tan α can be tested respectively. In this embodiment, the number of the first loading holes is seven.

[0052] Step 3: Adjust the position of the first load block 1 in the first load hole 22 and the position of the second load block 10 in the second load hole 72, connect both ends of the first load assembly and the second load assembly to both ends of a tensile tester respectively, and perform a strength test of the adhesive gel layer 18; Step 4, a), when the number K of the first load block and the second load block are both 1, by changing the load-receiving angle of the dental restoration adhesive structure, a strength test of the adhesive gel layer under tensile shear stress conditions at different angles can be performed to obtain the fracture strength of the adhesive gel layer; In the formula, S is the fracture strength of the adhesive gel layer, F is the fracture load, and B is the area of ​​the adhesive gel layer. The tensile stress applied to the adhesive gel layer is defined as M, and the shear stress applied to the adhesive gel layer is defined as N, where: In the JPEG2024176996000011.jpg13170 formula, α is L n and L1, M is the tensile stress applied to the adhesive gel layer, N is the shear stress applied to the adhesive gel layer, Ln is the projected linear distance from the center of φn to the center O of the adhesive gel layer, and L1 represents the linear distance between φ1 and point O, where φ1 is located in the same plane as the mid-surface of the adhesive gel layer, b) When the number K of the first load block and the second load block is both 2, If the load force of A1 and B1 is represented by F1, the angle between the direction of the line connecting the central axes of A1 and B1 and L1 is represented by α, the load force of A2 and B2 is represented by F2, and the angle between the direction of the line connecting the central axes of A2 and B2 and L1 is represented by β, the tensile stress received by the adhesive gel layer is M st and the shear stress acting on the adhesive gel layer is defined as N st Define it as: JPEG2024176996000012.jpg26170JPEG2024176996000013.jpg10170When A1 and B1 are simultaneously loaded, the load force is F1, and when A2 and B2 are simultaneously loaded alternately, the load force is the sinusoidal fatigue load F3, which can be obtained as follows: JPEG2024176996000014.jpg8170JPEG2024176996000015.jpg12170The angle between the direction of the line connecting the central axes of A1 and B1 and L1 is α, the angle between the direction of the line connecting the central axes of A2 and B2 and L1 is β, and the tensile stress applied to the adhesive gel layer is M dy and the shear stress acting on the adhesive gel layer is defined as N dy Define it as: JPEG2024176996000016.jpg27170JPEG2024176996000017.jpg16170

[0053] c) When the number K of the first load block and the second load block is both 3, A tensile force F1 is applied in the direction of the line connecting the central axes of A1 and B1, a tensile force F4 is applied in the direction of the line connecting the central axes of A2 and B2, and a tensile force F5 is applied in the direction of the line connecting the central axes of A3 and B3. The following is obtained: JPEG2024176996000018.jpg26170A tensile force F1 is applied in the direction of the line connecting the central axes of A1 and B1, a tensile force F4 is applied in the direction of the line connecting the central axes of A2 and B2, and a positive tensile force F5 is applied in the direction of the line connecting the central axes of A3 and B3. JPEG2024176996000019.jpg6170JPEG2024176996000020.jpg27170Calculate the fracture strength of a dental restoration adhesive structure under the combined action of current dynamic tensile stress and dynamic shear stress.

[0054] In the technical solution of the present invention, the stress measuring device can set multiple loading holes on two interlocking loading assemblies, and apply multiple loading blocks to engage with the loading holes at different positions, and can carry out mechanical performance tests under different tensile-shear combined stress states on the dental restoration adhesive structure to measure the fracture strength under different tensile-shear combined stress states. The strength check of the adhesive gel layer provides abundant and accurate data support. The above combination of various force or load application methods and stress calculation further fully demonstrate that the measuring device of the present invention can meet various force-bearing situations, can simulate more abundant stress situations, and has a wider range of application. [Explanation of symbols]

[0055] 1. First Load Block 111 Third connecting pin 2. First circular arc-shaped steel piece 21 First Groove 22 First Load Hole 5 Extracted teeth 61 First stopper block 62 First stopper clamp block 621 First strip slit 622 First Adjustment Bolt 63 First Fastener 7 Second circular arc-shaped steel piece 71 Second Groove 72 Second Load Hole 81 Second stopper block 82 Second stopper clamp block 821 Second strip slit 822 Second Adjustment Bolt 83 Second Fastener 9 First Connection Pin 10 Second Load Block 101 Fourth connecting pin 12 Adhesive Blocks 13 Square container 15 Second connecting pin 16 First U-shaped connecting member 17 Second U-shaped connector 18 Adhesive gel layer 19 Connection voltage

Claims

1. A dental restoration adhesive structure stress measuring device, comprising a first load assembly and a second load assembly of the same structure, the first load assembly and the second load assembly being assembled in a centrosymmetric manner, and the dental restoration adhesive structure being assembled between the first load assembly and the second load assembly; The first load assembly includes two first arc-shaped steel pieces arranged in parallel, the two first arc-shaped steel pieces being removably connected; the second load assembly includes two second arc-shaped steel pieces arranged in parallel, the two second arc-shaped steel pieces being removably connected; A first groove is provided on a right-angle side of the first circular arc-shaped steel piece, a second groove is provided on a right-angle side of the second circular arc-shaped steel piece, and a dental restoration bonding structure is provided between the first groove and the second groove; A stress measuring device for a dental restoration adhesive structure, characterized in that a plurality of load holes are provided along the circumferential direction of the arc on both the first arc-shaped steel piece and the second arc-shaped steel piece, and load blocks are connected to the load holes at different positions to realize the application of loads at different angles to the dental restoration adhesive structure.

2. The stress measuring device for a dental restoration adhesive structure as described in claim 1, characterized in that the dental restoration adhesive structure includes an extracted tooth and an adhesive block that is vertically adhered to the top surface of the extracted tooth, and further includes a rectangular container for embedding the extracted tooth, wherein the adhesive block is installed on the first load assembly side and the rectangular container is installed on the second load assembly side.

3. The stress measuring device for dental restoration adhesive structure as described in claim 2, characterized in that the adhesive block is installed between two first circular arc-shaped steel pieces, the adhesive block is installed on the first groove side, and the rectangular container is installed between two second circular arc-shaped steel pieces, the rectangular container is installed on the second groove side.

4. The stress measuring device for dental restoration adhesive structures as described in claim 2, characterized in that a first stopper assembly for limiting the position of the adhesive block is installed on the first load assembly, the first stopper assembly including a first stopper block and a first stopper clamp block, the adhesive block being installed between the first stopper block and the first stopper clamp block, and a second stopper assembly for limiting the position of the rectangular container is installed on the second load assembly, the second stopper assembly including a second stopper block and a second stopper clamp block, and the rectangular container is installed between the second stopper block and the second stopper clamp block.

5. 3. The stress measuring device for a dental restoration adhesive structure according to claim 2, wherein the first stopper block and the second stopper block are both fan-shaped, and the angle between the fan-shaped portions is 90 degrees.

6. The stress measuring device for a dental restoration adhesive structure as described in claim 4, characterized in that the first stopper clamp block has a rectangular shape, a first strip-shaped slit parallel to the side wall of the adhesive block is provided on the side of the first stopper clamp block closer to the adhesive block, the length of the first strip-shaped slit is shorter than the length of the first stopper clamp block, and a first adjustment bolt is further provided on the first stopper clamp block, and the first adjustment bolt is provided horizontally penetrating the first stopper clamp block.

7. The stress measuring device for dental restoration adhesive structures as described in claim 6, characterized in that the structure of the second stopper clamp block is the same as the structure of the first stopper clamp block, and a second strip-shaped slit and a second adjustment bolt are installed in the second stopper clamp block.

8. The first load assembly includes at least one first load block, and a plurality of first load holes are provided on the first arc-shaped steel piece, and the first load block can be assembled with any one of the first load holes, and the first load block is used to apply loads to different angles of the dental restoration bonding structure; The stress measuring device for dental restoration adhesive structure described in any one of claims 1 to 7, characterized in that the second load assembly includes at least one second load block, and a plurality of second load holes are installed in the second arc-shaped steel piece, the second load block can be assembled with any one of the second load holes, the second load block is used to apply loads to different angles of the dental restoration adhesive structure, and the number of the first load blocks and the second load blocks is represented by K, respectively, where K≧1.

9. A stress measuring device for a dental restoration adhesive structure as described in claim 8, characterized in that the first load block is sandwiched between two first arc-shaped steel pieces, the first load block being removably connected to any one of the first load holes, and the second load block is sandwiched between two second arc-shaped steel pieces, the second load block being removably connected to any one of the second load holes.

10. A method for using the dental restoration adhesive structure stress measuring device according to claim 8, comprising the steps of: s1. A dental restoration adhesive structure is manufactured, and the adhesive block forms an adhesive gel layer with the top surface of the extracted tooth; s2, the dental restoration bonding structure is connected to the first load assembly and the second load assembly, respectively, and some of the first load holes are aligned in a counterclockwise order with a φ １ , φ ２ , ..., φ ｎ and s3. Adjust the position of the loading hole, connect both ends of the first loading assembly and the second loading assembly to both ends of the tensile tester respectively, and perform a strength test of the adhesive gel layer, and the number of the first loading block and the number of the second loading block can be different combinations; s4. By changing the force-receiving angle of the dental restoration adhesive structure, strength tests of the adhesive gel layer under tensile shear stress conditions at multiple different angles can be performed to obtain the corresponding fracture strength of the adhesive gel layer; In the formula, S is the fracture strength of the adhesive gel layer, F is the fracture load, B is the area of ​​the adhesive gel layer, and α is the area of ​​the adhesive gel layer. ｎand L １ is the angle between the adhesive gel layer and the adhesive gel layer, M is the tensile stress that the adhesive gel layer is subjected to, N is the shear stress that the adhesive gel layer is subjected to, and L ｎ is φ ｎ is the projected linear distance from the center of the circle of the adhesive gel layer to the center O of the circle of the adhesive gel layer, and L １ is φ １ represents the straight-line distance between point O and point φ １ A method of using a dental restoration adhesive structure stress measurement device that is positioned flush with the interface of the adhesive gel layer and records multiple sets of M, N data.

Images