Zirconia ceramic / composite resin high-bonding-strength interface structure and design method thereof

Abstract

The invention discloses a zirconia ceramic / composite resin high-bonding-strength interface structure and a design method thereof. The zirconia ceramic / composite resin high-bonding-strength interface structure comprises a zirconia groove, a resin boss is embedded in the zirconia groove, and a binder coating is arranged between the inner wall of the zirconia groove and the outer wall of the resin boss; and the zirconium oxide groove and the resin boss are matched in shape and size and form a mechanical interlocking structure. According to the method, finite element simulation is adopted to establish a model, and the bonding strength of the zirconia ceramic / composite resin interface is calculated. The zirconia ceramic / composite resin interface structure designed by the invention is good in bonding performance, and the design method has the advantages of low cost, short period, high accuracy, strong controllability and the like.

Description

Technical Field

[0001] The present invention belongs to the technical field of dental bioceramics, relates to zirconia ceramics / composite resins, and particularly relates to a high-bonding-strength interface structure of zirconia ceramics / composite resins and a design method thereof. Background Art

[0002] Due to its excellent mechanical properties, good aesthetic effects, and outstanding biocompatibility, zirconia ceramics have become an ideal material in the field of dental restoration and are widely used in the fabrication of all-ceramic crowns, veneers, implants, and other restorations. However, in dental restoration, there is still much room for improvement in the bonding strength and durability of zirconia ceramics. The main reason for its difficult bonding lies in the strong chemical inertness of the zirconia ceramic surface, the lack of active functional groups, and the difficulty in forming effective chemical bonds with adhesives. In addition, zirconia ceramics do not contain a glass phase (such as silica), and it is impossible to increase the surface roughness and chemical activity by using hydrofluoric acid etching. These characteristics make it difficult to form good micro-mechanical interlocking and chemical bonding between the zirconia ceramic surface and the adhesive. In actual operation, common surface treatment methods (such as sandblasting, laser etching, etc.) can increase the surface roughness, but may introduce micro-cracks or residual contaminants, which will weaken the bonding effect. At the same time, the interfacial bonding strength between the adhesive and the zirconia ceramic is low, and the polymerization shrinkage of the resin cement may further weaken the bonding performance. In addition, zirconia ceramics are easily contaminated by saliva, blood, etc. during processing and clinical operations, forming an organic coating that is difficult to remove, further hindering the bonding between the adhesive and the ceramic surface. Therefore, the bonding problem of zirconia ceramics has become an important research direction in the field of dental restoration.

[0003] In order to improve the bonding performance of zirconia ceramics, the research mainly focuses on the optimization of the adhesive formulation and the improvement of the surface structure, that is, to enhance the bonding strength and service life of zirconia ceramics by enhancing the chemical bonding strength and micro-mechanical interlocking of the bonding interface. However, due to the stable chemical properties of zirconia ceramics themselves and the lack of active functional groups on the surface, the improvement of the bonding performance by only optimizing the adhesive formulation is limited.

[0004] Research shows that the interfacial strength can be significantly enhanced through the design of mechanical interlocking structures. For example, in multi-material additive manufacturing, the dovetail structure increases the contact area and optimizes the path planning, resulting in a 304.09% increase in the interfacial strength. Regarding the design of the interfacial mechanical interlocking structure, the prior art has the following defects: First, preparing a large number of physical specimens requires a large amount of manpower and material resources, with high costs and long experimental cycles. Second, it is difficult to fully control various parameters of the materials (such as material properties, geometric shapes, loading conditions, etc.) in experimental tests, making it difficult to accurately analyze the stress distribution and failure modes of the bonding interface, which may lead to limited repeatability and accuracy of the results. Summary of the Invention

[0005] In view of the deficiencies of the prior art, one of the objectives of the present invention is to provide an interface structure with high bonding strength between zirconia ceramics and composite resin, so as to solve the technical problems of insufficient bonding performance of zirconia ceramics in the prior art and being easily affected by the humid and hot oral environment.

[0006] In view of the deficiencies of the prior art, another objective of the present invention is to provide a design method for an interface structure with high bonding strength between zirconia ceramics and composite resin, so as to solve the technical problems of high cost, long cycle, and limited repeatability and accuracy of results when optimizing materials by experimental methods in the prior art.

[0007] To solve the above technical problems, the present invention is implemented by adopting the following technical solutions:

[0008] An interface structure with high bonding strength between zirconia ceramics and composite resin includes a zirconia groove, in which a resin boss is embedded, and a binder coating is provided between the inner wall of the zirconia groove and the outer wall of the resin boss; the shapes and sizes of the zirconia groove and the resin boss match each other and form a mechanical interlocking structure.

[0009] The present invention also has the following technical features:

[0010] Specifically, the shape of the zirconia groove is a cuboid and a regular prism with equal length and width, preferably a cuboid, a regular hexagonal prism, and a regular octagonal prism with equal length and width, and most preferably a regular hexagonal prism; the shape of the resin boss is a cuboid and a regular prism with equal length and width, preferably a cuboid, a regular hexagonal prism, and a regular octagonal prism with equal length and width, and most preferably a regular hexagonal prism.

[0011] Specifically, the side length of the zirconia groove is 0.1 - 0.6 mm, and the depth is 0.01 - 0.04 mm, preferably the side length is 0.17 - 0.4 mm, and the depth is 0.02 - 0.03 mm, and most preferably the side length is 0.23 mm, and the depth is 0.02 mm. The side length of the resin boss is 0.1 - 0.6 mm, and the height is 0.01 - 0.04 mm, preferably the side length is 0.17 - 0.4 mm, and the depth is 0.02 - 0.03 mm, and most preferably the side length is 0.23 mm, and the depth is 0.02 mm.

[0012] Specifically, the thickness of the binder coating is 0.001 - 0.05 mm, preferably the thickness is 0.003 - 0.015 mm, and most preferably the thickness is 0.015 mm.

[0013] The present invention also protects a design method for the zirconia ceramic / composite resin high bonding strength interface structure as described above. This method uses finite element simulation to establish a model and calculate the bonding strength of the zirconia ceramic / composite resin interface. The method specifically includes the following steps:

[0014] Step 1, design the parameters of the zirconia ceramic / composite resin interface structure:

[0015] The parameters of the zirconia ceramic / composite resin interface structure include the shape of the zirconia groove, the side length of the zirconia groove, the depth of the zirconia groove, the shape of the resin boss, the side length of the resin boss, the height of the resin boss, and the thickness of the binder coating.

[0016] Step 2, determine the positions of the zirconia grooves and resin bosses:

[0017] Establish a zirconia interface, and then based on the central coordinates of the zirconia interface, locate the position of the first zirconia groove so that its geometric center coincides with the origin of the modeling software; determine the positions of the zirconia grooves according to the total area of the bonding surface, and design the spacing between adjacent zirconia grooves, and based on this spacing, locate the central coordinates of the remaining zirconia grooves; establish a resin interface, and then design the positions of the resin bosses on the resin interface, and the positions of the resin bosses need to correspond one by one to the positions of the zirconia grooves.

[0018] Step 3, establish a zirconia groove matrix and a resin boss matrix respectively:

[0019] Set the first zirconia groove at the central position of the zirconia interface, and then based on this zirconia groove, lay out several zirconia grooves along the x-axis and y-axis directions with the spacing set in Step 2 as the step size to obtain a zirconia groove matrix interface; lay out resin bosses on the resin interface, and the resin bosses are set corresponding one by one to the zirconia grooves to obtain a resin boss matrix interface.

[0020] Step 4, combine the zirconia groove matrix and the resin boss matrix to form a concave-convex mating structure:

[0021] Align the zirconia groove matrix interface and the resin boss matrix interface in the vertical direction and then assemble them so that each zirconia groove in the zirconia groove matrix and each resin boss in the resin boss matrix correspond one by one and mesh with each other to form a concave-convex mating structure matrix assembly.

[0022] Step 5, calculate the bonding strength of the zirconia ceramic / composite resin interface:

[0023] Import the assembled concave-convex mating structure matrix obtained in Step 4 into the finite element analysis software, define the material types of the zirconia groove matrix and the resin boss matrix, then perform mesh division, set shear boundary conditions on the side surfaces of the resin bosses, apply a displacement increasing sequence along the direction perpendicular to the axis of the resin bosses, select the interface mechanics model in the finite element analysis software for calculation and solution to obtain the shear stress-displacement curve, where the horizontal axis is the applied displacement and the vertical axis is the stress; by analyzing the curve, finally determine the maximum bonding strength of the zirconia ceramic / composite resin interface.

[0024] Specifically, in Step 2, the distance between two adjacent zirconia grooves is 0.1 - 0.6 mm, preferably 0.1 - 0.3 mm, and most preferably 0.2 mm.

[0025] Specifically, in Step 5, define the zirconia groove matrix as a brittle material and the resin boss matrix as an elastoplastic material.

[0026] Specifically, in Step 5, the displacement increasing sequence is: the starting value is 0 mm, the step size is 0.00001 - 0.003 mm, the ending value is 0.005 - 0.03 mm, preferably the step size is 0.00005 - 0.0015 mm, the ending value is 0.01 - 0.02 mm, and most preferably the step size is 0.0001 mm, the ending value is 0.015 mm.

[0027] Specifically, in Step 5, the selected interface mechanics model is the adhesion-debonding model.

[0028] The beneficial technical effects of the present invention compared with the prior art:

[0029] (Ⅰ) The zirconia ceramic / composite resin interface structure designed by the present invention is composed of zirconia grooves, resin bosses and an adhesive coating applied between the grooves and the bosses. The size and spacing of the resin bosses are designed to be exactly the same as those of the zirconia grooves, which can ensure that the size, position and distribution of the resin bosses correspond one by one to the zirconia grooves, thereby realizing precise matching between the two and further realizing mechanical interlocking; the adhesive coating is evenly coated between the resin bosses and the zirconia grooves, further enhancing the interface bonding strength and enabling the zirconia ceramic to maintain good bonding performance in the oral wet and hot environment.

[0030] (Ⅱ) The zirconia ceramic / composite resin interface structure designed by the present invention, in which the shear strength of the concave-convex mating structure formed by the concave-convex assembly with a hexagonal prism structure is not less than 29 MPa, which is 123% higher than the bonding strength of the zirconia / resin interface without concave-convex mating in the prior art.

[0031] (III) The design method of the present invention is carried out entirely on a computer, without the need to prepare a large number of physical specimens, reducing the consumption of materials and equipment. In addition, the simulation process can be completed in a relatively short time, greatly shortening the research cycle.

[0032] (IV) The design method of the present invention uses finite element simulation to accurately control various parameters of the materials involved in the zirconia bonding process (such as material properties, geometry, load conditions, etc.), so as to more accurately analyze the stress distribution and failure mode of the bonding interface, avoiding limitations in the repeatability and accuracy of the results. In addition, it can also predict potential bonding failure risks in advance, helping to optimize the design and process parameters. For example, through simulation, it can be found that the maximum strength that the designed interface structure can bear is not ideal, and feedback to the source of the pattern design to optimize the design, thereby improving the bonding strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a flow chart of the design method for the high-bonding-strength interface structure of zirconia ceramic / composite resin of the present invention.

[0034] Figure 2 It is a three-dimensional schematic diagram of the high-bonding-strength interface structure of zirconia ceramic / composite resin in Example 2 (including the cuboid concave-convex matching structure).

[0035] Figure 3 It is a three-dimensional schematic diagram of the high-bonding-strength interface structure of zirconia ceramic / composite resin in Example 3 (including the regular hexagonal prism concave-convex matching structure).

[0036] Figure 4 It is a three-dimensional schematic diagram of the high-bonding-strength interface structure of zirconia ceramic / composite resin in Example 4 (including the regular octagonal prism concave-convex matching structure).

[0037] Figure 5 It is a three-dimensional schematic diagram of the zirconia ceramic / composite resin interface structure in Comparative Example 1 (without the concave-convex matching structure).

[0038] Figure 6 It is a stress-displacement curve diagram calculated from the zirconia bonding model obtained in Example 2 of the present invention.

[0039] Figure 7 It is a stress-displacement curve diagram calculated from the zirconia bonding model obtained in Example 3 of the present invention.

[0040] Figure 8 It is a stress-displacement curve diagram calculated from the zirconia bonding model obtained in Example 4 of the present invention.

[0041] Figure 9 It is a stress-displacement curve diagram calculated from the zirconia bonding model obtained in Comparative Example 1 of the present invention.

[0042] The technical solution of the present invention will be further described below in conjunction with embodiments. Specific embodiments

[0043] It should be noted that all software used in the present invention, without special instructions, adopts software known in the art. For example: the modeling software adopts the commonly used Solidworks software known in the prior art. The finite element analysis software adopts the commonly used COMSOL Multiphysics software known in the prior art.

[0044] It should be noted that the present invention is a computer simulation design, and the actual material preparation can refer to the simulation calculation results. When preparing the actual specimen, the zirconia ceramic is a homogeneous material, and the surfaces of the grooves are all zirconia ceramics. Stabilized zirconia can be selected, and the stabilizer is selected from one or more of yttrium oxide, calcium oxide, magnesium oxide, and cerium oxide; the composite resin and its boss are made of the same material, which belongs to a light-curing composite resin and has a certain strength, and the flexural strength is generally not less than 9 GPa. A composite resin composed of a resin matrix and inorganic fillers as the main components can be selected. The resin matrix is selected from methacrylate resins, for example, bisphenol A-glycidyl methacrylate, and the inorganic fillers are selected from one or more of silica, barium glass, and strontium glass powder; the material of the adhesive can be selected from commonly used dental restorative adhesives in clinics, for example, Multilink Speed light-curing resin cement, RelyX Ultimate resin cement, etc.

[0045] Following the above technical solution, specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent transformations made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0046] Example 1:

[0047] This example provides a zirconia ceramic / composite resin high-bonding strength interface structure and its design method. The zirconia ceramic / composite resin interface structure includes a zirconia groove, a resin boss is embedded in the zirconia groove, and an adhesive coating is provided between the inner wall of the zirconia groove and the outer wall of the resin boss.

[0048] Example 2:

[0049] This example provides a zirconia ceramic / composite resin high-bonding strength interface structure and its design method. The method specifically includes the following steps:

[0050] Step 1, design the parameters of the zirconia ceramic / composite resin interface structure:

[0051] In this embodiment, the zirconia groove is a cuboid structure with a length and width of 0.4 mm and a depth of 0.02 mm; the resin boss is a cuboid structure with a length and width of 0.4 mm and a height of 0.02 mm; the thickness of the binder coating is 0.003 mm.

[0052] Step two, determine the positions of the zirconia groove and the resin boss:

[0053] Establish a zirconia interface, and then, based on the central coordinates of the zirconia interface, locate the position of the first zirconia groove so that its geometric center coincides with the origin of the modeling software; determine the positions of the zirconia grooves according to the total area of the bonding surface, and design the spacing between adjacent two zirconia grooves to be 0.2 mm, and locate the central coordinates of the remaining zirconia grooves based on this spacing; establish a resin interface, and then design the positions of the resin bosses on the resin interface, and the positions of the resin bosses need to correspond to the positions of the zirconia grooves one by one.

[0054] Step three, establish a zirconia groove matrix and a resin boss matrix respectively:

[0055] Set the first zirconia groove at the central position of the zirconia interface, and then, based on this zirconia groove, lay out several zirconia grooves along the x-axis and y-axis directions with the spacing set in step two as the step length to obtain a zirconia groove matrix interface (i.e., a zirconia interface with a regularly distributed zirconia groove matrix). Lay out the resin bosses on the resin interface, and the resin bosses are set corresponding to the zirconia grooves one by one to obtain a resin boss matrix interface (i.e., a resin interface with a regularly distributed resin boss matrix).

[0056] Step four, combine the zirconia groove matrix and the resin boss matrix to form a concave-convex matching structure:

[0057] Align the zirconia groove matrix interface and the resin boss matrix interface in the vertical direction in step three and then assemble them so that each zirconia groove in the zirconia groove matrix corresponds to and meshes with each resin boss in the resin boss matrix to form a concave-convex matching structure matrix assembly.

[0058] Step five, calculate the bonding strength of the zirconia ceramic / composite resin interface:

[0059] Import the assembled concave-convex mating structure matrix obtained in Step 4 into the finite element analysis software. Define the zirconia groove matrix as a brittle material and the resin boss matrix as an elastoplastic material. Subsequently, perform mesh generation and set a shear boundary condition on the side surface of the resin boss. Apply a displacement increasing sequence along the direction perpendicular to the axis of the resin boss. The displacement increasing sequence is as follows: the starting value is 0 mm, the step size is 0.0001 mm, and the ending value is 0.015 mm. Select the interface mechanics model as the adhesion-debonding model in the finite element analysis software for calculation and solution to obtain the shear stress-displacement curve, where the horizontal axis is the applied displacement and the vertical axis is the stress. By analyzing the curve, finally determine that the maximum bonding strength of the zirconia ceramic / composite resin interface is not less than 26 MPa.

[0060] Example 3:

[0061] This example provides a high-bonding-strength interface structure and its design method for zirconia ceramic / composite resin. The method specifically includes the following steps:

[0062] Step 1, design the parameters of the zirconia ceramic / composite resin interface structure:

[0063] In this example, the zirconia groove is a regular hexagonal prism structure, the side length of the zirconia groove is 0.23 mm, and the depth is 0.02 mm; the resin boss is a regular hexagonal prism structure, the side length of the resin boss is 0.23 mm, and the height is 0.02 mm; the thickness of the binder coating is 0.015 mm.

[0064] Step 2, determine the positions of the zirconia grooves and resin bosses:

[0065] Establish a zirconia interface, and then based on the central coordinates of the zirconia interface, locate the position of the first zirconia groove so that its geometric center coincides with the origin of the modeling software; determine the positions of the zirconia grooves according to the total area of the bonding surface, and design the spacing between adjacent two zirconia grooves to be 0.2 mm, and based on this spacing, locate the central coordinates of the remaining zirconia grooves. Establish a resin interface, and then design the positions of the resin bosses on the resin interface. The positions of the resin bosses need to correspond to the positions of the zirconia grooves one by one.

[0066] Step 3, establish a zirconia groove matrix and a resin boss matrix respectively:

[0067] Set a first zirconia groove at the center position of the zirconia interface. Then, taking this zirconia groove as a reference, lay out several zirconia grooves along the x-axis and y-axis directions with the spacing set in Step 2 as the step size to obtain a zirconia groove matrix interface (i.e., a zirconia interface with a regularly distributed zirconia groove matrix). Lay out resin bosses on the resin interface, with the resin bosses corresponding one-to-one to the zirconia grooves, to obtain a resin boss matrix interface (i.e., a resin interface with a regularly distributed resin boss matrix).

[0068] Step 4, combine the zirconia groove matrix and the resin boss matrix to form a concave-convex mating structure:

[0069] Align the zirconia groove matrix interface and the resin boss matrix interface in the vertical direction in Step 3 and then assemble them so that each zirconia groove in the zirconia groove matrix corresponds one-to-one and meshes with each resin boss in the resin boss matrix to form a concave-convex mating structure matrix assembly.

[0070] Step 5, calculate the bonding strength of the zirconia ceramic / composite resin interface:

[0071] Import the concave-convex mating structure matrix assembly obtained in Step 4 into finite element analysis software. Define the zirconia groove matrix as a brittle material and the resin boss matrix as an elastoplastic material. Then perform mesh generation and set a shear boundary condition on the side surface of the resin boss. Apply a displacement increment sequence along the direction perpendicular to the axis of the resin boss. The displacement increment sequence is: the starting value is 0 mm, the step size is 0.0001 mm, and the ending value is 0.015 mm. Select the interfacial mechanics model as the adhesion-debonding model in the finite element analysis software for calculation and solution to obtain a shear stress-displacement curve, where the horizontal axis is the applied displacement and the vertical axis is the stress. By analyzing the curve, finally determine that the maximum bonding strength of the zirconia ceramic / composite resin interface is not less than 29 MPa.

[0072] Example 4:

[0073] This example provides a zirconia ceramic / composite resin high-bonding strength interface structure and its design method. The method specifically includes the following steps:

[0074] Step 1, design the parameters of the zirconia ceramic / composite resin interface structure:

[0075] In this example, the zirconia groove is a regular octagonal prism structure, the side length of the zirconia groove is 0.17 mm, and the depth is 0.02 mm; the resin boss is a regular octagonal prism structure, the side length of the resin boss is 0.17 mm, and the height is 0.02 mm; the thickness of the adhesive coating is 0.003 mm.

[0076] Step 2, determine the positions of the zirconia grooves and the resin bosses:

[0077] An indium tin oxide interface is established, and then, based on the central coordinates of the indium tin oxide interface, the position of the first indium tin oxide groove is located so that its geometric center coincides with the origin of the modeling software; the positions of the indium tin oxide grooves are determined according to the total area of the bonding surface, and the distance between two adjacent indium tin oxide grooves is designed to be 0.2 mm, and based on this distance, the central coordinates of the remaining indium tin oxide grooves are located. A resin interface is established, and then the positions of the resin bosses are designed on the resin interface, and the positions of the resin bosses need to correspond one by one to the positions of the indium tin oxide grooves.

[0078] Step 3: Establish an indium tin oxide groove matrix and a resin boss matrix respectively:

[0079] The first indium tin oxide groove is set at the center of the indium tin oxide interface, and then, based on this indium tin oxide groove, several indium tin oxide grooves are arranged along the x-axis and y-axis directions with the distance set in Step 2 as the step size to obtain an indium tin oxide groove matrix interface (i.e., an indium tin oxide interface with a regularly distributed indium tin oxide groove matrix). Resin bosses are arranged on the resin interface, and the resin bosses are arranged in one-to-one correspondence with the indium tin oxide grooves to obtain a resin boss matrix interface (i.e., a resin interface with a regularly distributed resin boss matrix).

[0080] Step 4: Combine the indium tin oxide groove matrix and the resin boss matrix to form a concave-convex matching structure:

[0081] The indium tin oxide groove matrix interface and the resin boss matrix interface in Step 3 are aligned vertically and then assembled so that each indium tin oxide groove in the indium tin oxide groove matrix and each resin boss in the resin boss matrix correspond one by one and mesh with each other to form a concave-convex matching structure matrix assembly.

[0082] Step 5: Calculate the bonding strength of the indium tin oxide ceramic / composite resin interface:

[0083] The concave-convex matching structure matrix assembly obtained in Step 4 is imported into finite element analysis software, the indium tin oxide groove matrix is defined as a brittle material, the resin boss matrix is defined as an elastoplastic material, and then mesh generation is performed, and a shear boundary condition is set on the side surface of the resin boss, and a displacement increasing sequence is applied along the direction perpendicular to the axis of the resin boss. The displacement increasing sequence is: the starting value is 0 mm, the step size is 0.0001 mm, and the ending value is 0.015 mm; the interface mechanical model is selected as the adhesion-debonding model in the finite element analysis software for calculation and solution to obtain a shear stress-displacement curve, where the horizontal axis is the applied displacement and the vertical axis is the stress. By analyzing the curve, it is finally determined that the maximum bonding strength of the indium tin oxide ceramic / composite resin interface is not less than 24 MPa.

[0084] Comparative Example 1:

[0085] This comparative example presents a design method for the zirconia ceramic / composite resin interface structure. This zirconia ceramic / composite resin interface structure includes a zirconia plane and a resin plane (i.e., without a concave-convex fitting structure), and an adhesive coating is applied between the zirconia plane and the resin plane. In this comparative example, the thickness of the adhesive coating is 0.0015 μm (the same material as the adhesive coating in Example 3). The method specifically includes the following steps:

[0086] Step 1, establish a three-dimensional model of the zirconia and composite resin without a concave-convex fitting structure:

[0087] The zirconia model is designed as a cuboid with a side length of 10 mm and a height of 3 mm, and one of the square end faces is selected as the bonding surface; the composite resin model is designed as a cylinder with a diameter of 3 mm and a height of 3 mm, and one of the circular end faces is selected as the bonding surface. Assemble the two models with the bonding surfaces facing each other to ensure that the geometric center of the square bonding surface of the zirconia model coincides exactly with the center of the circular bonding surface of the resin model. Set an adhesive layer with a thickness of 0.0015 μm between the zirconia bonding surface and the resin bonding surface to achieve a tight combination of the interface.

[0088] Step 2, import the assembly obtained in Step 1 into finite element analysis software, define the zirconia groove matrix as a brittle material, and the resin boss matrix as an elastoplastic material. Subsequently, perform mesh generation, and set shear boundary conditions on the side surface of the resin column, and apply a displacement increment sequence in the direction perpendicular to the axis, with a starting value of 0 mm, a step size of 0.0001 mm, and an ending value of 0.015 mm. Select the interface mechanical model as the adhesion-debonding model for calculation and solution to obtain the shear stress-displacement curve, where the horizontal axis is the applied displacement and the vertical axis is the stress. By analyzing the curve, it is finally determined that the maximum bonding strength of the zirconia ceramic / composite resin interface is not less than 13 MPa.

[0089] The following conclusions can be drawn from the above examples and comparative examples:

[0090] The maximum bonding strengths of the zirconia ceramic / composite resin interfaces in Example 2, Example 3, and Example 4 are not less than 26 MPa, 29 MPa, and 24 MPa respectively, all far higher than 13 MPa in Comparative Example 1, indicating that the concave-convex fitting structure formed by grooves and bosses combined with the bonding characteristics of the adhesive coating itself can significantly enhance the overall strength of the zirconia ceramic / composite resin interface. In addition, among the three examples, the best-performing example is Example 3, indicating that designing the zirconia groove and the resin boss as a regular hexagonal prism structure is the optimal structure.

[0091] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A zirconia ceramic / composite resin high bonding strength interface structure, characterized in that: It comprises a zirconia groove, a resin boss is embedded in the zirconia groove, and an adhesive coating is arranged between the inner wall of the zirconia groove and the outer wall of the resin boss; the shapes and sizes of the zirconia groove and the resin boss match to form a mechanical interlocking structure.

2. The zirconia ceramic / composite resin high bonding strength interface structure according to claim 1, characterized in that: The shape of the zirconia groove is a rectangular parallelepiped and a regular prism with equal length and width; the shape of the resin boss is a rectangular parallelepiped and a regular prism with equal length and width.

3. The zirconia ceramic / composite resin high bonding strength interface structure according to claim 1, characterized in that: The side length of the zirconia groove is 0.1-0.6 mm, and the depth is 0.01-0.04 mm; the side length of the resin boss is 0.1-0.6 mm, and the height is 0.01-0.04 mm.

4. The zirconia ceramic / composite resin high bonding strength interface structure according to claim 1, characterized in that: The thickness of the adhesive coating is 0.001-0.05 mm.

5. A method for designing a high bonding strength interface structure of zirconia ceramic / composite resin as claimed in any one of claims 1 to 4, characterized in that: This method uses finite element simulation to establish a model and calculate the bonding strength of the zirconia ceramic / composite resin interface.

6. The method for designing a high bonding strength interface structure of zirconia ceramic / composite resin according to claim 5, characterized in that: The method specifically comprises the following steps: Step 1: Design the parameters of the zirconia ceramic / composite resin interface structure: The parameters of the zirconia ceramic / composite resin interface structure include the shape of the zirconia groove, the side length of the zirconia groove, the depth of the zirconia groove, the shape of the resin boss, the side length of the resin boss, the height of the resin boss and the thickness of the adhesive coating; Step 2: Determine the position of the zirconia groove and the resin boss: Establish a zirconia interface, and then use the central coordinates of the zirconia interface as a reference to locate the position of the first zirconia groove so that its geometric center coincides with the origin of the modeling software; determine the position of the zirconia groove according to the total area of ​​the bonding surface, and design the spacing between two adjacent zirconia grooves, and use this spacing as a basis to locate the central coordinates of the remaining zirconia grooves; establish a resin interface, and then design the position of the resin boss on the resin interface, and the position of the resin boss needs to correspond one-to-one with the position of the zirconia groove; Step 3: Establish the zirconia groove matrix and the resin boss matrix respectively: A first zirconia groove is set at the center of the zirconia interface, and then, with the zirconia groove as a reference, a plurality of zirconia grooves are arranged along the x-axis and y-axis directions with the spacing set in step 2 as a step length to obtain a zirconia groove matrix interface; resin bosses are arranged on the resin interface, and the resin bosses are arranged one-to-one with the zirconia grooves to obtain a resin boss matrix interface; Step 4: Combine the zirconia groove matrix and the resin boss matrix to form a concave-convex matching structure: Align the zirconium oxide groove matrix interface and the resin boss matrix interface in step 3 in the vertical direction and assemble them, so that each zirconium oxide groove in the zirconium oxide groove matrix and each resin boss in the resin boss matrix correspond to each other and mesh with each other to form a concave-convex matching structure matrix assembly; Step 5: Calculate the bonding strength of the zirconia ceramic / composite resin interface: Import the concave-convex matching structure matrix assembly obtained in step 4 into the finite element analysis software, define the material types of the zirconia groove matrix and the resin boss matrix, then perform meshing, set shear boundary conditions on the side of the resin boss, apply an increasing series of displacements in a direction perpendicular to the axis of the resin boss, select the interface mechanics model in the finite element analysis software for calculation and solution, and obtain the shear stress-displacement curve, in which the horizontal axis is the applied displacement and the vertical axis is the stress; by analyzing the curve, finally determine the maximum bonding strength of the zirconia ceramic / composite resin interface.

7. The method for designing a high bonding strength interface structure of zirconia ceramic / composite resin according to claim 6, characterized in that: In step 2, the distance between two adjacent zirconia grooves is 0.1 to 0.6 mm.

8. The method for designing a zirconia ceramic / composite resin high bonding strength interface structure according to claim 6, characterized in that: In step 5, the zirconia groove matrix is ​​defined as a brittle material and the resin boss matrix is ​​defined as an elastic-plastic material.

9. The method for designing a high bonding strength interface structure of zirconia ceramic / composite resin according to claim 6, characterized in that: In step five, the displacement increment series is as follows: the starting value is 0 mm, the step length is 0.00001 to 0.003 mm, and the ending value is 0.005 to 0.03 mm.

10. The method for designing a zirconia ceramic / composite resin high bonding strength interface structure according to claim 6, characterized in that: In step 5, the interface mechanical model selected is the adhesion-debonding model.

Images