Dental instrument and method of manufacturing thereof

Abstract

A dental instrument and its manufacturing method are disclosed. The dental instrument includes a shell-shaped dental appliance, functional attachments, and an adhesive layer bonding the shell-shaped dental appliance and the functional attachments. The adhesive strength between the adhesive layer and the shell-shaped dental appliance and the functional attachments is between 5 MPa and 20 MPa. The ratio R1 of the flexural elastic modulus of the adhesive layer to that of the shell-shaped dental appliance is between 0.05 and 0.15, and / or the ratio R2 of the bending stiffness K1 of the adhesive portion of the functional attachment to that of the adhesive portion of the shell-shaped dental appliance is between 0.05 and 0.15. This invention, by adjusting the rigidity of the adhesive layer and / or the local rigidity of the adhesive portion of the functional attachments, allows the mechanical energy generated by the bending deformation of the shell-shaped dental appliance under stress to be effectively absorbed through the elastic deformation of the adhesive layer and the adhesive portion of the functional attachments. These bending stresses are not transmitted to the bonding surface in a large proportion, thereby preventing damage to the bonding surface and improving the reliability of the bond.

Description

Technical Field

[0001] This invention belongs to the field of dental instrument technology, and relates to a dental instrument and its preparation method. Background Technology

[0002] With the development of orthodontics, shell-shaped dental appliances are becoming increasingly popular due to their advantages such as ease of wear, aesthetics, and convenience for daily oral care. To enhance the orthodontic effect, many functional accessories are usually combined with shell-shaped dental appliances to achieve functions such as traction, guiding the mandible forward, and opening the bite.

[0003] Currently, these functional accessories are usually bonded to dental instruments. Considering the usage scenarios of these functional accessories, it is essential to improve the clinical reliability of the bonding. Summary of the Invention

[0004] In order to solve one of the problems existing in the prior art, the present invention aims to provide a dental instrument and a method for preparing the same.

[0005] To achieve one of the above-mentioned objectives, the present invention adopts the following technical solution:

[0006] A dental instrument includes a shell-shaped dental appliance, a functional accessory, and an adhesive layer for bonding the shell-shaped dental appliance and the functional accessory. The adhesive strength between the adhesive layer and the shell-shaped dental appliance, and between the adhesive layer and the functional accessory, is greater than 5 MPa. The ratio R1 of the flexural modulus of the adhesive layer to the flexural modulus of the shell-shaped dental appliance is between 0.05 and 0.15, and / or the ratio R2 of the flexural stiffness K1 of the adhesive portion of the functional accessory to the flexural stiffness K2 of the adhesive portion of the shell-shaped dental appliance is between 0.05 and 0.15.

[0007] Furthermore, R1 is between 0.05 and 0.15, and the elastic modulus of the functional accessories is between 300 MPa and 2000 MPa.

[0008] Furthermore, the thickness of the adhesive layer is between 0.05 mm and 0.2 mm.

[0009] Furthermore, the flexural elastic modulus of the shell-shaped dental appliance is between 1000 MPa and 2000 MPa; or, the flexural elastic modulus of the adhesive layer is between 100 MPa and 500 MPa.

[0010] Furthermore, when R2 is between 0.05 and 0.15, R1 > 0.15.

[0011] Furthermore, the adhesive portion of the accessory includes at least one subtractive material portion.

[0012] Furthermore, the material reduction ratio of the subtractive material section is not less than 25%.

[0013] Furthermore, the subtractive material portion is located in the middle region of the adhesive portion of the functional accessory.

[0014] Furthermore, the subtractive material portion is located in the edge region of the adhesive portion of the functional accessory.

[0015] Furthermore, the functional accessory includes an accessory bonding portion for bonding with the shell-shaped dental appliance, an auxiliary orthodontic portion for assisting in orthodontic treatment, and at least one of the subtractive portions is arranged circumferentially along the connection point on the accessory bonding portion that connects to the auxiliary orthodontic portion.

[0016] Furthermore, the functional attachment includes an attachment bonding portion for bonding with the shell-shaped dental appliance, an auxiliary orthodontic portion for assisting in orthodontic treatment, and at least two of the subtractive portions are evenly arranged circumferentially along the connection point on the attachment bonding portion where they connect with the auxiliary orthodontic portion.

[0017] Furthermore, the functional attachment includes an attachment bonding portion for bonding with the shell-shaped dental appliance, an auxiliary orthodontic portion for assisting in orthodontic treatment, and at least one of the subtractive parts is evenly distributed on the attachment bonding portion.

[0018] Furthermore, the subtractive portion is a thinned portion, and the thickness of the thinned portion is less than the thickness of other areas on the adhesive portion of the functional accessory.

[0019] Furthermore, the thinning portion is recessed from at least one side of the adhesive side and the non-adhesive side of the accessory adhesive portion.

[0020] Furthermore, the subtractive material portion is a hollow portion, and the hollow portion penetrates the adhesive portion of the functional accessory in at least one direction.

[0021] Furthermore, the hollow portion passes through the adhesive portion of the functional accessory in a direction parallel to the adhesive surface, or the hollow portion passes through the adhesive portion of the functional accessory in a direction perpendicular to the adhesive surface.

[0022] Furthermore, the elastic modulus of the adhesive portion of the functional accessory is less than the elastic modulus of the non-adhesive portion.

[0023] Furthermore, the elastic modulus of the adhesive portion of the functional accessory is 50 MPa to 150 MPa.

[0024] Furthermore, the flexural modulus of the non-adhesive portion of the functional accessory is between 300 MPa and 2000 MPa.

[0025] Furthermore, the bonding strength between the adhesive layer and the shell-shaped dental appliance, and between the adhesive layer and the functional accessory, are all between 5 MPa and 20 MPa.

[0026] Furthermore, the functional accessories include at least one of the following: traction buckle, bracket, jaw pad, double jaw plate, flat guide plate, or reinforcing rib.

[0027] A method for preparing a dental instrument includes the following steps:

[0028] When the bond strength between the adhesive layer and the shell-shaped dental appliance, and between the adhesive layer and the functional accessories are both greater than 5 MPa, the flexural elastic modulus of the shell-shaped dental appliance and the adhesive layer is obtained.

[0029] If the ratio R1 of the flexural elastic modulus of the adhesive layer to that of the shell-shaped dental appliance is between 0.05 and 0.15, the functional accessory is bonded; if R1 > 0.15, the rigidity of the adhesive part of the functional accessory is adjusted so that the ratio R2 of the bending stiffness K1 of the adhesive part of the functional accessory to that of the bending stiffness K2 of the adhesive part of the shell-shaped dental appliance is between 0.05 and 0.15, and the functional accessory is bonded.

[0030] A method for preparing a dental instrument includes the following steps:

[0031] When the bond strength between the adhesive layer and the shell-shaped dental appliance, and between the adhesive layer and the functional attachments are both greater than 5 MPa, the bending stiffness of the adhesive portion of the shell-shaped dental appliance and the adhesive portion of the functional attachments is obtained.

[0032] If the ratio R2 of the bending stiffness K1 of the adhesive portion of the functional accessory to the bending stiffness K2 of the adhesive portion of the shell-shaped dental appliance is between 0.05 and 0.15, the functional accessory is bonded to the adhesive portion of the shell-shaped dental appliance using adhesive. If R2 > 0.15, the rigidity of the adhesive layer used to bond the functional accessory is adjusted so that the ratio R1 of the flexural elastic modulus of the adhesive layer to the flexural elastic modulus of the shell-shaped dental appliance is between 0.05 and 0.15.

[0033] A method for preparing a dental instrument includes the following steps:

[0034] An adhesive layer is formed at the bonding area of ​​the shell-shaped dental appliance;

[0035] Adhesive layer bonding function accessories;

[0036] Wherein, the bonding strength between the adhesive layer and the shell-shaped dental appliance, and between the adhesive layer and the functional accessory, is greater than 5 MPa; the ratio R1 of the flexural elastic modulus of the adhesive layer to the flexural elastic modulus of the shell-shaped dental appliance is between 0.05 and 0.15; and / or the ratio R2 of the bending stiffness K1 of the adhesive portion of the functional accessory to the bending stiffness K2 of the adhesive portion of the shell-shaped dental appliance is between 0.05 and 0.15.

[0037] Furthermore, the thickness of the adhesive layer is between 0.05 mm and 0.2 mm.

[0038] Furthermore, at least one subtractive material portion is formed at the adhesive portion of the accessory.

[0039] Furthermore, the subtractive material portion is a thinning portion, the thickness of which is less than the thickness of other areas on the adhesive portion of the functional accessory; or, the subtractive material portion is a hollow portion, the hollow portion penetrating the adhesive portion of the functional accessory in at least one direction.

[0040] Furthermore, the elastic modulus of the adhesive portion of the functional accessory is less than the elastic modulus of the non-adhesive portion.

[0041] Furthermore, the bonding strength between the adhesive layer and the shell-shaped dental appliance, and between the adhesive layer and the functional accessory, are all between 5 MPa and 20 MPa.

[0042] Furthermore, the functional accessories include at least one of the following: traction buckle, bracket, jaw pad, double jaw plate, flat guide plate, or reinforcing rib.

[0043] Compared with the prior art, the present invention, under the condition that the adhesive and the shell-shaped dental appliance and functional accessories have a certain bonding force, adjusts the rigidity of the adhesive layer and / or the local rigidity of the bonding part of the functional accessories. This allows the mechanical energy generated by the bending deformation of the shell-shaped dental appliance under stress to be effectively absorbed by the elastic deformation of the adhesive layer and / or the bonding part of the functional accessories. These bending stresses will not be transferred to the bonding surface in a large proportion, thereby effectively preventing damage to the bonding surface and improving the reliability of the bond. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of a traditional traction buckle;

[0045] Figure 2 yes Figure 1 A structural diagram from another angle;

[0046] Figure 3 This is a schematic diagram of the structure of a traction buckle according to an embodiment of the present invention;

[0047] Figure 4This is a schematic diagram of a traction buckle with a hollowed-out portion according to another embodiment of the present invention;

[0048] Figure 5 yes Figure 4 A structural diagram from another angle;

[0049] Figure 6 yes Figure 4 A structural diagram from another angle;

[0050] Figure 7 This is a schematic diagram of the structure of a traction buckle with a thinning portion in another embodiment of the present invention;

[0051] Figure 8 yes Figure 7 A structural diagram from another angle;

[0052] Figure 9 This is a schematic diagram of the traditional jaw plate and shell-shaped dental appliance.

[0053] Figure 10 This is a schematic diagram of the jaw plate in one embodiment of the present invention;

[0054] Figure 11 This is a schematic diagram of the jaw plate in another embodiment of the present invention;

[0055] Figure 12 yes Figure 11 A schematic diagram showing the combination of the jaw plate and the shell-shaped dental appliance.

[0056] Among them, 100-dental instrument, 1-shell-shaped dental appliance, 2-functional accessory, 3-adhesive layer, 21-accessory bonding part, 211-hollowed-out part, 212-thinning part, 22-auxiliary orthodontic part. Detailed Implementation

[0057] The present invention will now be described in detail with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional modifications made by those skilled in the art based on these embodiments are included within the scope of protection of the present invention.

[0058] The inventors discovered that shell-shaped dental appliances frequently undergo bending deformation during clinical use, including bending deformation of the bonding platform, functional attachments, and bonding surfaces. This bending deformation is a major cause of functional attachment bonding failure. Based on this discovery, this invention improves the clinical reliability of bonding by adjusting the rigidity of the bonding joint.

[0059] Please refer to Figures 3-8 , Figures 10-12As shown, a dental instrument 100 according to a preferred embodiment of the present invention includes a shell-shaped dental appliance 1, a functional accessory 2, and an adhesive layer 3 for bonding the shell-shaped dental appliance 1 and the functional accessory 2.

[0060] The shell-shaped dental appliance 1 is used to be worn on one or more teeth, including an inner surface facing the tooth and an outer surface facing away from the tooth, the inner surface surrounding a receiving cavity for accommodating an entire row of teeth or a portion of the teeth.

[0061] In one specific embodiment, the shell-shaped dental appliance 1 is a transparent and colorless invisible appliance made of plastic material, and can be made of any material and by any method known in the art.

[0062] The functional accessory 2 includes, but is not limited to, traction buckles, brackets, jaw pads, bimaxillary plates, flat guide plates, or reinforcing ribs, to enhance the orthodontic effect of the shell-shaped dental appliance 1 or to add orthodontic functions to the shell-shaped dental appliance 1. This invention primarily focuses on... Figures 3-8 The traction buckle shown Figures 10-12 The jaw plate shown is used as an example for explanation; other functional accessories will not be discussed one by one.

[0063] Specifically, the functional accessory 2 includes an accessory bonding portion 21 for bonding with the shell-shaped dental appliance 1, and an auxiliary orthodontic portion 22 that assists in orthodontic treatment. Those skilled in the art will understand that the accessory bonding portion 21 is the bonding portion of the functional accessory 2, the part used for bonding with adhesive. All other structures besides the accessory bonding portion 21 are collectively referred to as the auxiliary orthodontic portion 22, and the detailed structure of the auxiliary orthodontic portion 22 will not be described in detail here.

[0064] In some functional accessories 2, the accessory adhesive part 21 and the auxiliary orthodontic part 22 are integral, with no obvious dividing line between them, for example... Figure 9 , Figures 11-12 The jaw plate, etc., are shown. For this type of functional accessory 2, the present invention defines the portion near the adhesive surface and within a predetermined thickness as the accessory adhesive portion 21; in one embodiment, the portion with a thickness between 0.15 mm and 2 mm is defined as the accessory adhesive portion 21.

[0065] In some of the functional accessories 2, the accessory adhesive part 21 and the auxiliary orthodontic part 22 are two separate structures, for example... Figures 1-8 The tow hook shown is an example of this.

[0066] The adhesive layer 3 is formed by curing an adhesive of a certain thickness. It is preferably a food-grade, medical-grade, or biocompatible adhesive, which is environmentally friendly and suitable for instruments placed in the oral cavity.

[0067] Further research by the inventors revealed that the adhesive force (or adhesive strength) between the adhesive layer 3 and the shell-shaped dental appliance 1 and the functional accessory 2 is one of the main factors determining the reliability of the bond. This adhesive force includes the adhesive force between the adhesive and the shell-shaped dental appliance 1, and the adhesive force between the adhesive and the functional accessory 2.

[0068] When the adhesive layer 3 has a bonding strength of less than 5 MPa with the shell-shaped dental appliance 1 and the functional accessory 2, the bonding strength is too weak to meet the reliability requirements. Therefore, this invention selects an adhesive with a bonding strength greater than 5 MPa with both the shell-shaped dental appliance 1 and the functional accessory 2 to form the adhesive layer 3.

[0069] Preferably, the adhesive layer 3 has a bonding strength between 5 MPa and 20 MPa with both the shell-shaped dental appliance 1 and the functional accessory 2, and more particularly, an adhesive layer 3 with a bonding strength between 5 MPa and 8 MPa is selected. This allows it to cover commonly used adhesives, and the bonding strength is in the middle range. However, it may be damaged during clinical use. The present invention further improves the reliability of the bond by adjusting the local rigidity of at least one of the adhesive layer 3 and the adhesive portion 21 of the accessory, thereby increasing the splitting strength or peel strength of the bond.

[0070] When the adhesive layer 3, the shell-shaped dental appliance 1, and the functional accessory 2 have an adhesion force greater than 20 MPa, the adhesive force of the adhesive is already strong enough. However, the solution of the present invention is preferred to further improve reliability.

[0071] In the first embodiment, when the bonding strength between the adhesive layer 3 and the shell-shaped dental appliance 1, and between the adhesive layer 3 and the functional accessory 2, is between 5 MPa and 20 MPa, the bonding reliability can be improved by adjusting the rigidity of the adhesive layer 3.

[0072] Specifically, by appropriately reducing the rigidity of the adhesive layer 3, the mechanical energy generated by the bending deformation of the shell-shaped dental appliance 1 can be effectively absorbed by the elastic deformation of the adhesive layer 3. These bending stresses will not be transferred to the bonding surface in a large proportion, thereby effectively preventing damage to the bonding surface and improving the reliability of the bonding.

[0073] Further research revealed that the lower the ratio R1 of the flexural elastic modulus of the adhesive layer 3 to that of the shell-shaped dental appliance 1, the higher the clinical reliability.

[0074] When the ratio R1 of the flexural elastic modulus of the adhesive layer 3 to that of the shell-shaped dental appliance 1 is less than 0.05, the material of the adhesive layer 3 is too soft, which affects the transmission of the orthodontic force, and the shell-shaped dental appliance 1 cannot achieve an effective orthodontic effect.

[0075] When R1 is between 0.05 and 0.15, the adhesive layer 3 has moderate stiffness, providing effective bonding force between the shell-shaped dental appliance 1 and the functional accessory 2. Furthermore, as a buffer layer absorbing the deformation mechanical energy of the shell-shaped dental appliance 1 and the functional accessory 2, it achieves high clinical reliability of bonding performance without requiring special adjustments to the local rigidity of the accessory bonding portion 21. In other words, the elastic modulus of the functional accessory 2 only needs to be adjusted according to the requirements of the orthodontic function, without requiring special adjustments for bonding reliability. For example, the elastic modulus of the functional accessory 2 can be between 300 MPa and 2000 MPa.

[0076] Preferably, R1 is between 0.06 and 0.12, especially between 0.08 and 0.10. The adhesive layer 3 has moderate stiffness, which can not only transmit the orthodontic force well, but also buffer and absorb the deformation mechanical energy of the shell-shaped dental appliance 1 and the functional accessory 2, resulting in high bonding reliability.

[0077] Specifically, the flexural elastic modulus of the shell-shaped dental appliance 1 is between 1000 MPa and 2000 MPa; or, the flexural elastic modulus of the adhesive layer 3 is between 100 MPa and 500 MPa.

[0078] The inventors further discovered that the ratio R1 of the flexural elastic modulus of the adhesive layer 3 to that of the shell-shaped dental appliance 1 can be controlled by selecting the adhesive and controlling the thickness of the adhesive layer 3. Given the limited types of adhesives and the high difficulty and long development cycle of adhesive research, this invention preferably controls the thickness of the adhesive layer 3.

[0079] In this invention, the thickness of the adhesive layer 3 is between 0.05mm and 0.2mm, preferably between 0.05mm and 0.1mm. If the adhesive layer 3 is too thin, its strength is insufficient, resulting in weak adhesion; if it is too thick, it will not significantly improve the reliability of the adhesion, but will instead waste material.

[0080] When R1 > 0.15, the reliability of the adhesive layer 3 bonding is relatively reduced. At this time, the local rigidity of the accessory bonding part 21 needs to be reduced to a certain range to ensure the reliability of the bonding. Specifically, the adjustment of the local rigidity of the accessory bonding part 21 can be referred to the second type of embodiment below.

[0081] In the second embodiment, when the bonding strength between the adhesive layer 3 and the shell-shaped dental appliance 1, and between the adhesive layer 3 and the functional accessory 2 are both between 5 MPa and 20 MPa, the local stiffness of the accessory bonding part 21 can be adjusted to improve the reliability of the bonding.

[0082] The smaller the ratio R2 of the bending stiffness K1 of the adhesive portion 21 to the bending stiffness K2 of the adhesive portion of the shell-shaped dental appliance 1, the higher the clinical reliability. Wherein, bending stiffness K = EI, E = flexural modulus of elasticity, and I = moment of inertia of section = bh 3 / 12, b=section width, h=section height; for irregularly shaped adhesive parts, their bending stiffness can be calculated by integration.

[0083] When R2 < 0.05, the material of the functional accessory 2 is too soft, which affects the transmission of the corrective force, and the shell-shaped dental appliance 1 cannot achieve an effective corrective effect.

[0084] Preferably, R2 is between 0.05 and 0.15, and the stiffness of the adhesive part 21 is moderate. It serves both as an adhesive layer and as a buffer layer absorbing the deformation mechanical energy of the shell-shaped dental appliance 1 and the functional accessory 2, thus achieving high clinical reliability in the bonding of the functional accessory 2. Based on this, the flexural modulus of the adhesive layer 3 can be disregarded; that is, reliable bonding can be achieved with R1 between 0.05 and 0.15, or R1 > 0.15.

[0085] By appropriately reducing the local rigidity of the attachment bonding portion 21, the mechanical energy generated by the bending deformation of the shell-shaped dental appliance 1 can be effectively absorbed by the elastic deformation of the attachment bonding portion 21. These bending stresses will not be transferred to the bonding surface in a large proportion, thereby effectively preventing damage to the bonding surface and improving the reliability of the bonding.

[0086] Methods for reducing the local rigidity of the adhesive portion 21 of the accessory include, but are not limited to, structural improvements and material improvements.

[0087] First, structural improvements are made, including but not limited to: reducing the thickness or material of the accessory adhesive portion 21 to reduce the bending resistance of the accessory adhesive portion 21 structure.

[0088] In one embodiment, please compare Figures 1-3 The thickness of the entire adhesive portion 21 of the functional accessory 2 is reduced, thereby decreasing the bending stiffness of the adhesive portion 21. This improvement is preferably applicable to functional accessories 2 with a clear boundary between the adhesive portion 21 and the auxiliary orthodontic portion 22.

[0089] Please refer to Figure 3 As shown, the thickness of the accessory adhesive portion 21 is no greater than 0.2 mm, preferably between 0.15 mm and 0.2 mm. Compared to the traditional thickness of 0.37 mm, the thickness of the accessory adhesive portion 21 of the present invention is greatly reduced, resulting in low bending stiffness and the ability to effectively absorb mechanical energy when the shell-shaped dental appliance 1 and the functional accessory 2 deform.

[0090] In another embodiment, material is removed from a portion of the accessory bonding portion 21 to reduce the bending stiffness of the accessory bonding portion 21. That is, compared to the original complete accessory bonding portion 21, the accessory bonding portion 21 includes at least one subtractive portion.

[0091] The proportion of material reduced in the subtractive portion relative to the original mass of the complete adhesive portion 21 is called the subtraction ratio. The larger the subtraction ratio, the lower the rigidity of the adhesive portion 21. When the subtraction ratio is not less than 25%, the bonding reliability can be effectively improved. For example, when the subtraction ratio is 30%, the bonding failure rate can be reduced to 0.

[0092] Specifically, the material reduction portion can be a hollow portion 211 provided on the accessory bonding portion 21. The hollow portion 211 penetrates the accessory bonding portion 21 in at least one direction, which reduces the amount of material used and enhances the buffering effect of the accessory bonding portion 21 in the event of deformation, thereby further improving the bonding reliability.

[0093] by Figures 4-6 Taking the traction buckle shown as an example, the hollow part 211 can penetrate the accessory adhesive part 21 in a direction perpendicular to the adhesive surface, that is, the adhesive direction.

[0094] Or, with Figure 10 Taking the jaw plate shown as an example, the hollow portion 211 can also penetrate the accessory adhesive portion 21 in a direction parallel to the adhesive surface. The hollow portion 211 is located on the side of the accessory adhesive portion 21 facing the auxiliary orthodontic portion 22, which is equivalent to the accessory adhesive portion 21 being connected to the auxiliary orthodontic portion 22 through a number of spaced connecting posts. This hollow structure can produce a large deformation without breaking when the jaw plate is under force, and it also blocks the transmission of mechanical deformation, which helps to improve the reliability of the adhesive.

[0095] In addition, such as Figure 7 and Figure 8 As shown, the thickness of a local area on the accessory bonding portion 21 can also be reduced to form the subtractive portion. That is, the subtractive portion is a thinned portion 212, and the thickness of the thinned portion 212 is less than the thickness of other areas of the accessory bonding portion 21, so that the rigidity of the entire accessory bonding portion 21 is small and it can deform within a certain range.

[0096] The thinning portion 212 is formed recessed from at least one of the adhesive side and the non-adhesive side of the accessory adhesive portion 21 toward the opposite side, and can be thinned by unidirectional or bidirectional recess. Those skilled in the art will understand that the thinning portion 212 on the adhesive side is formed recessed toward the side where the non-adhesive layer is located, and the thinning portion 212 on the non-adhesive side is formed recessed toward the adhesive side.

[0097] Please refer to and compare. Figure 4 and Figure 7 As shown, the thinning portion 212 is positioned similarly to the hollowed-out portion 211. Taking the hollowed-out portion 211 and the thinning portion 212 shown in the figure as examples, the position of the subtractive material portion will be described.

[0098] The subtractive material portion can be located in the middle region of the accessory bonding portion 21. In this case, the subtractive material portion is surrounded by other regions, and the outer periphery of the accessory bonding portion 21 has a continuous and complete structure, which can maintain the inherent shape of the accessory bonding portion 21 and facilitate bonding. Of course, the subtractive material portion can also be located in the edge region of the accessory bonding portion 21 for easier processing and shaping.

[0099] Alternatively, the at least one subtractive material portion is arranged circumferentially along the connection point on the accessory adhesive portion 21 where it connects to the auxiliary orthodontic portion 22.

[0100] Furthermore, when there are at least two subtractive parts, the at least two subtractive parts are evenly arranged circumferentially along the connection point on the accessory adhesive part 21 for connecting with the auxiliary orthodontic part 22; regardless of the direction of the orthodontic force, the entire accessory adhesive part 21 has a reliable adhesive effect.

[0101] Alternatively, at least one subtractive material portion may be evenly distributed on the accessory adhesive portion 21, which also enables the accessory adhesive portion 21 to have a better buffering effect when subjected to force in all directions, thus meeting the requirements for clinical adhesive reliability.

[0102] Secondly, improvements are made from a material perspective. The elastic modulus of the adhesive portion 21 is less than that of the non-adhesive portion. The different materials of the adhesive and non-adhesive portions can be combined using methods such as multi-component injection molding, ultrasonic welding, laser welding, and induction welding.

[0103] In one embodiment, the elastic modulus of the adhesive portion 21 is 50 MPa to 150 MPa, and the flexural elastic modulus of the non-adhesive portion is between 300 MPa and 2000 MPa, for example, 500 MPa or 1000 MPa.

[0104] Furthermore, the present invention can adjust the rigidity of the adhesive layer 3 as in the first embodiment, and simultaneously adjust the local rigidity of the accessory bonding portion 21 as in the second embodiment, thereby doubly improving the reliability of the bond. That is, any design scheme for the adhesive layer 3 in the first embodiment can be combined with the second embodiment to improve the reliability of the bond, and any design scheme for the accessory bonding portion 21 in the second embodiment can be combined with the first embodiment to improve the reliability of the bond.

[0105] The present invention also provides a method for preparing a dental instrument, comprising the following steps:

[0106] Provide a shell-shaped dental appliance 1, adhesive, and functional accessory 2; when the bonding strength between the adhesive layer 3 and the shell-shaped dental appliance 1, and between the adhesive layer 3 and the functional accessory 2 are all between 5 MPa and 20 MPa, obtain the flexural elastic modulus of the shell-shaped dental appliance 1 and the adhesive layer 3.

[0107] If the ratio R1 of the flexural elastic modulus of the adhesive layer 3 to that of the shell-shaped dental appliance 1 is between 0.05 and 0.15, any functional accessory 2 can be directly bonded; if R1 > 0.15, the rigidity of the accessory bonding part 21 needs to be adjusted so that the ratio R2 of the bending stiffness K1 of the accessory bonding part 21 to that of the bending stiffness K2 of the bonding part of the shell-shaped dental appliance 1 is between 0.05 and 0.15, and then the functional accessory 2 can be bonded.

[0108] The present invention also provides another method for preparing a dental instrument, comprising the following steps:

[0109] Provide a shell-shaped dental appliance 1, adhesive, and functional accessory 2; when the bonding strength between the adhesive layer 3 and the shell-shaped dental appliance 1, and between the adhesive layer 3 and the functional accessory 2 are both between 5 MPa and 20 MPa, obtain the bending stiffness of the adhesive part of the shell-shaped dental appliance 1 and the adhesive part 21 of the accessory.

[0110] If the ratio R2 of the bending stiffness K1 of the adhesive part 21 to the bending stiffness K2 of the adhesive part of the shell-shaped dental appliance 1 is between 0.05 and 0.15, any adhesive can be used to bond the functional accessory 2 to the adhesive part of the shell-shaped dental appliance 1; if R2 > 0.15, it is necessary to adjust the rigidity of the adhesive layer 3 used to bond the functional accessory 2 so that the ratio R1 of the flexural elastic modulus of the adhesive layer 3 to the flexural elastic modulus of the shell-shaped dental appliance 1 is between 0.05 and 0.15.

[0111] The present invention also provides another method for preparing a dental instrument, comprising the following steps:

[0112] An adhesive layer 3 is formed at the bonding portion of the shell-shaped dental appliance 1;

[0113] Adhesive layer 3 is used to bond functional accessory 2;

[0114] Wherein, the bonding strength between the adhesive layer 3 and the shell-shaped dental appliance 1, and between the adhesive layer 3 and the functional accessory 2, is between 5 MPa and 20 MPa; the ratio R1 of the flexural elastic modulus of the adhesive layer 3 to that of the shell-shaped dental appliance 1 is between 0.05 and 0.15; and / or, the ratio R2 of the bending stiffness K1 of the accessory bonding portion 21 to that of the bending stiffness K2 of the bonding portion of the shell-shaped dental appliance 1 is between 0.05 and 0.15.

[0115] Based on any of the above-mentioned dental instrument preparation methods, the adhesive layer 3 can be adjusted using any of the schemes in the first type of embodiment described above. For example, the thickness of the adhesive layer 3 is between 0.05mm and 0.2mm; other details will not be elaborated further.

[0116] Based on any of the above-described methods for manufacturing dental instruments, the rigidity adjustment of the attachment bonding portion 21 can be achieved using any of the schemes described in the second type of embodiment. For example: the thickness of the attachment bonding portion 21 is between 0.15 mm and 0.2 mm; or, the attachment bonding portion 21 includes at least one thinning portion 212, the thickness of which is less than the thickness of other areas on the attachment bonding portion 21; or, the attachment bonding portion 21 includes at least one hollow portion 211, the hollow portion 211 penetrating the attachment bonding portion 21 in at least one direction; or, the elastic modulus of the attachment bonding portion 21 is less than the elastic modulus of the non-bonded portion; other variations will not be elaborated further.

[0117] Similarly, the functional accessory 2, as described above, includes at least one of a traction buckle, bracket, jaw pad, double jaw plate, flat guide plate, or reinforcing rib.

[0118] The dental instrument 100 and its preparation method of the present invention will be described in detail below with reference to specific embodiments.

[0119] First implementation method: Taking the functional accessory 2 as an example, under the premise that the bonding strength between the adhesive and the shell-shaped dental appliance 1 and the functional accessory 2 is 5MPa~8MPa, the bonding reliability is explored by adjusting the bending elastic modulus of the shell-shaped dental appliance 1, the bending elastic modulus of the adhesive layer 3 and the bending elastic modulus of the traction buckle. The test results are shown in Table 1.

[0120] Referring to Table 1, as shown in Examples 1-7, when the ratio R1 of the flexural elastic modulus of the adhesive layer 3 to that of the shell-shaped dental appliance 1 is between 0.05 and 0.15, the bonding reliability is not affected by the flexural elastic modulus of the traction buckle. In this case, when the flexural elastic modulus of the traction buckle varies between 300 MPa and 2000 MPa, the proportion of torsional failure of the traction buckle is 0.

[0121] As can be seen from Examples 8-10, when the ratio R1 of the flexural elastic modulus of the adhesive layer 3 to the flexural elastic modulus of the shell-shaped dental appliance 1 is greater than 0.15, only when the rigidity of the traction buckle is reduced to a certain extent, for example, when the flexural elastic modulus of the traction buckle is reduced from 2000MPa to 300MPa or below, so that the ratio R2 of the bending stiffness K1 of the accessory adhesive part 21 to the bending stiffness K2 of the adhesive part of the shell-shaped dental appliance 1 is between 0.05 and 0.15, the proportion of torsional failure of the traction buckle is 0.

[0122] Table 1

[0123]

[0124] Second implementation method: Taking the functional accessory 2 as a traction buckle as an example, under the premise that the bonding strength between the adhesive and the shell-shaped dental appliance 1 and the functional accessory 2 is 5MPa~8MPa, the bending stiffness of the traction buckle bonding base is reduced by reducing the thickness and material of the bonding base of the traction buckle, and the bonding reliability is investigated. The test results are shown in Table 2.

[0125] For details, please refer to Figures 1-3 As shown: A traction buckle is bonded to the shell-shaped dental appliance 1. The flexural elastic modulus of the shell-shaped dental appliance 1 is 1000 MPa, the flexural elastic modulus of the adhesive layer 3 is 400 MPa, and R1 is 0.4. We reduce the bending stiffness of the traction buckle adhesive base by reducing the thickness of the adhesive base. The specific experimental parameters and test results are shown in Table 2.

[0126] Please refer to Table 2. As shown in Examples 1-3, when the thickness of the adhesive base of the traction buckle is in the range of 0.25mm to 0.37mm, the ratio R2 of the bending stiffness K1 of the traction buckle base to the bending stiffness K2 of the adhesive structure of the shell-shaped dental appliance 1 is greater than 0.15, and the torsional failure rate of the traction buckle is greater than 10%, indicating poor reliability. As shown in Examples 4 and 5, when the thickness of the adhesive base of the traction buckle is in the range of 0.15mm to 0.2mm, the ratio R2 of the bending stiffness K1 of the traction buckle base to the bending stiffness K2 of the adhesive structure of the shell-shaped dental appliance 1 is 0.05 to 0.12, and the torsional failure rate of the traction buckle is 0, indicating high adhesive reliability of the traction buckle. In these examples, the cross-sectional widths of the traction buckle base and the adhesive portion of the shell-shaped dental appliance 1 are equal, the cross-sectional height of the traction buckle base is equal to the base thickness, and the cross-sectional height of the adhesive structure of the shell-shaped dental appliance 1 is 0.5mm.

[0127] Table 2

[0128]

[0129] Table 2 illustrates the following: The bonding reliability can be improved by adjusting the thickness of the adhesive part 21 of the accessory. When R1 > 0.15, R2 between 0.05 and 0.15 can ensure clinical bonding reliability. When R2 > 0.15, the clinical reliability is poor.

[0130] Third implementation method: Taking the functional accessory 2 as a traction buckle as an example, under the premise that the bonding strength between the adhesive and the shell-shaped dental appliance 1 and the functional accessory 2 is 5MPa~8MPa, the bonding reliability is explored by reducing the material of the bonding base of the traction buckle. The test results are shown in Table 3.

[0131] Please refer to and compare. Figures 1-2 , Figures 4-8 , Figure 10 As shown: A traction buckle is bonded to a shell-shaped dental appliance 1. The flexural modulus of the shell-shaped dental appliance 1 is 1000 MPa, the flexural modulus of the adhesive layer 3 is 400 MPa (R1 is 0.4), and the flexural modulus of the traction buckle is 2000 MPa. We can also reduce the bending stiffness of the traction buckle adhesive base by reducing the material of the adhesive base, thereby improving the bonding reliability.

[0132] Specific experimental and test results are shown in Table 3. With a fixed flexural modulus of elasticity for the shell-shaped dental appliance 1 and the traction buckle, as the material reduction ratio of the traction buckle base increases, the ratio R2 of the traction buckle base's bending stiffness K1 to the bending stiffness K2 of the adhesive structure of the shell-shaped dental appliance gradually decreases. When the material reduction ratio reaches 30% or more, the proportion of torsional failure of the traction buckle decreases to 0. The material reduction ratio in this invention refers to the mass ratio of the reduced material to the original adhesive material.

[0133] Table 3

[0134]

[0135] Fourth implementation method: Taking the functional accessory 2 as an example, under the premise that the bonding strength between the adhesive and the shell-shaped dental appliance 1 and the functional accessory 2 is 5MPa~8MPa, the bonding reliability is explored by adjusting the material of the bonding part of the jaw plate. The test results are shown in Table 3.

[0136] For details, please refer to Figure 9 , Figures 11-12 As shown, a jaw plate is bonded to a shell-shaped dental appliance 1. The flexural modulus of the shell-shaped dental appliance 1 is 1000 MPa, the flexural modulus of the adhesive is 400 MPa, R1 is 0.4, and R1 is greater than 0.15. We improved the bonding effect by using a material with a lower flexural modulus for the bonding part of the jaw plate. The specific experimental parameters and test results are shown in Table 3.

[0137] Please refer to Table 4. The flexural modulus of elasticity of the non-bonded portion of the jaw plate is 500 MPa, while the flexural modulus of elasticity of the bonded portion material ranges from 50 MPa to 500 MPa. As in Examples 1 and 2, when the ratio R2 of the flexural stiffness K1 of the jaw plate bonded portion to the flexural stiffness K2 of the bonded portion structure of the shell-shaped dental appliance 1 is greater than 0.15, the proportion of torsional failure of the jaw plate is relatively high, and the bonding reliability is poor. As in Examples 3 to 5, when the ratio R2 of the flexural stiffness K1 of the jaw plate bonded portion to the flexural stiffness K2 of the bonded portion structure of the shell-shaped dental appliance 1 is between 0.05 and 0.15, the proportion of torsional failure of the jaw plate is 0, and the bonding reliability is high.

[0138] The embodiments in Table 4 further illustrate that the bonding reliability can be improved by adjusting the elastic modulus of the adhesive part 21 of the accessory. When R1 > 0.15, R2 between 0.05 and 0.15 can ensure clinical bonding reliability. When R2 > 0.15, the clinical reliability is poor.

[0139] Table 4

[0140]

[0141] In summary, under the condition that the adhesive and the shell-shaped dental appliance 1 and the functional accessory 2 have a certain bonding force, the present invention, by appropriately reducing the rigidity of the adhesive or the local rigidity of the accessory bonding part 21, allows the mechanical energy generated by the bending deformation of the shell-shaped dental appliance 1 under stress to be effectively absorbed by the elastic deformation of the adhesive layer 3 and the accessory bonding part 21. These bending stresses will not be transferred to the bonding surface in a large proportion, thereby effectively preventing damage to the bonding surface and improving the reliability of the bonding.

[0142] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0143] The detailed descriptions listed above are merely specific descriptions of feasible implementation methods of this application and are not intended to limit the scope of protection of this application. All equivalent implementation methods or modifications made without departing from the spirit of the art of this application should be included within the scope of protection of this application.

Claims

1. A dental appliance comprising a shell-like dental appliance, a functional attachment, an adhesive layer bonding the shell-like dental appliance and the functional attachment, characterized in that, The functional accessory is a traction buckle, which includes an adhesive base for bonding with the shell-shaped dental appliance. The bonding strength between the adhesive layer and the shell-shaped dental appliance, and between the adhesive layer and the traction buckle, is greater than 5 MPa. The ratio of the flexural elastic modulus of the adhesive layer to the flexural elastic modulus of the shell-shaped dental appliance is R1. The thickness of the adhesive base is 0.15 mm to 0.2 mm. The ratio of the bending stiffness K1 of the adhesive base to the bending stiffness K2 of the adhesive part of the shell-shaped dental appliance is R2. R2 is between 0.05 and 0.12, and R1 is between 0.05 and 0.15 or R1 > 0.

15.

2. The dental instrument of claim 1, wherein, R1 is between 0.05 and 0.15, and the elastic modulus of the tow buckle is between 300 MPa and 2000 MPa.

3. The dental instrument of claim 1, wherein, The thickness of the adhesive layer is between 0.05 mm and 0.2 mm.

4. The dental instrument of any one of claims 1 to 3, wherein, The flexural modulus of the shell-shaped dental appliance is between 1000 MPa and 2000 MPa; or, the flexural modulus of the adhesive layer is between 100 MPa and 500 MPa.

5. The dental instrument of claim 1, wherein, The adhesive base includes at least one subtractive material section.

6. The dental instrument of claim 5, wherein, The material reduction ratio of the subtractive material section is not less than 25%.

7. The dental instrument of claim 5, wherein, The subtractive material section is located in the middle region of the adhesive base.

8. The dental instrument of claim 5, wherein, The subtractive material portion is located in the edge region of the adhesive base.

9. The dental instrument of claim 5, wherein, The traction buckle also includes an auxiliary correction part that plays an auxiliary correction role, and at least one of the subtractive parts is arranged circumferentially along the connection point on the adhesive base where it is connected to the auxiliary correction part.

10. The dental instrument of claim 5, wherein, The traction buckle also includes an auxiliary correction part that plays an auxiliary correction role, and at least two of the subtractive parts are evenly arranged circumferentially along the connection point on the adhesive base where they are connected to the auxiliary correction part.

11. The dental instrument of claim 5, wherein, The traction buckle also includes an auxiliary correction part that plays an auxiliary correction role, and at least one of the subtractive parts is evenly distributed on the adhesive base.

12. The dental instrument of any one of claims 5 to 11, wherein, The material reduction section is a thinning section, and the thickness of the thinning section is less than the thickness of other areas on the adhesive base.

13. The dental instrument according to claim 12, characterized in that, The thinning portion is recessed from at least one side of the adhesive side and the non-adhesive side of the adhesive base.

14. The dental instrument according to any one of claims 5 to 11, characterized in that, The subtractive material portion is a hollow portion, and the hollow portion penetrates the adhesive base in at least one direction.

15. The dental instrument according to claim 14, characterized in that, The hollow portion penetrates the adhesive base in a direction parallel to the adhesive surface, or the hollow portion penetrates the adhesive base in a direction perpendicular to the adhesive surface.

16. The dental instrument according to claim 1, characterized in that, The adhesive base and the non-adhesive part of the traction buckle are made of different materials, and the elastic modulus of the adhesive base is less than that of the non-adhesive part.

17. The dental instrument according to claim 16, characterized in that, The elastic modulus of the adhesive base is 50 MPa ~ 150 MPa.

18. The dental instrument according to claim 16 or 17, characterized in that, The flexural modulus of the non-adhesive portion of the traction buckle is between 300 MPa and 2000 MPa.

19. The dental instrument according to claim 1, characterized in that, The bonding strength between the adhesive layer and the shell-shaped dental appliance, and between the adhesive layer and the traction buckle, is between 5 MPa and 20 MPa.

20. A method for preparing a dental instrument, characterized in that, Includes the following steps: An adhesive layer is formed at the bonding area of ​​the shell-shaped dental appliance; The adhesive base of the traction buckle is bonded to the adhesive layer; The adhesive layer has a bonding strength greater than 5 MPa with the shell-shaped dental appliance and with the traction buckle. The ratio of the flexural elastic modulus of the adhesive layer to that of the shell-shaped dental appliance is R1. The thickness of the adhesive base is 0.15 mm to 0.2 mm. The ratio of the bending stiffness K1 of the adhesive base to the bending stiffness K2 of the adhesive part of the shell-shaped dental appliance is R2. R2 is between 0.05 and 0.12, and R1 is between 0.05 and 0.15 or R1 > 0.

15.

21. The method for preparing a dental instrument according to claim 20, characterized in that, The thickness of the adhesive layer is between 0.05 mm and 0.2 mm.

22. The method for preparing a dental instrument according to claim 20, characterized in that, At least one subtractive portion is formed in the adhesive base.

23. The method for preparing a dental instrument according to claim 22, characterized in that, The subtractive material portion is a thinning portion, the thickness of which is less than the thickness of other areas on the adhesive base; or, the subtractive material portion is a hollow portion, the hollow portion penetrating the adhesive base in at least one direction.

24. The method for preparing a dental instrument according to claim 20, characterized in that, The adhesive base and the non-adhesive part of the traction buckle are made of different materials, and the elastic modulus of the adhesive base is less than that of the non-adhesive part.

25. The method for preparing a dental instrument according to claim 20, characterized in that, The bonding strength between the adhesive layer and the shell-shaped dental appliance, and between the adhesive layer and the traction buckle, is between 5 MPa and 20 MPa.

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