Stamp composition, stamp material, stamp, and method for producing the same

Abstract

This invention discloses an impression composition, an impression material, an impression, and a method for preparing the same, belonging to the field of photocuring technology. The impression composition comprises the following components in weight percentages: 10%-25% oligomer, 1%-5% acrylate monomer, 0.05%-1% photoinitiator, 0.5%-2% dispersant, and 62%-85% silica filler; wherein the oligomer includes polyurethane acrylate with a functionality of 3-9. The impression composition is prepared by uniformly mixing the above raw materials and further molded into a photocurable impression material. Before curing, this impression intermediate exhibits excellent flexural strength (i.e., tear resistance), detail reproduction, and storage stability. In use, the impression material can be directly cured using photocuring. The curing time is suitable and controllable, the degree of curing is high, and it exhibits good dimensional stability during curing. The prepared impression has high hardness.

Description

Technical Field

[0001] This invention relates to the field of photocuring technology, and in particular to impression compositions, impression materials, impressions and their preparation methods. Background Technology

[0002] Tooth loss refers to the absence of any natural teeth or roots in the entire dental arch, also known as edentulism. With increasing life expectancy, the number of edentulous patients seeking medical attention is expected to rise. Complete dentures are dentures worn by patients with complete tooth loss. They use artificial materials to replace the missing upper or lower jaw dentition (artificial teeth) and related tissues (base). This is the most common restorative method for edentulous patients in clinical practice. Before complete denture restoration, a malleable impression material is used to replicate the anatomical morphology of the alveolar ridge and surrounding soft and hard tissues of the edentulous jaw, providing a good structural basis for the subsequent fabrication of the denture. Accurate edentulous jaw impressions are crucial for successful complete denture placement. However, in actual clinical practice, the oral morphology and alveolar ridge conditions of different patients vary greatly. Pre-made trays cannot meet the individual dental arch and alveolar ridge conditions of each patient. Currently, it is common practice to fabricate individual trays for secondary impression taking to improve impression accuracy, accommodate individual patient differences, and ensure the restorative effect of complete dentures.

[0003] Currently known materials used to make individual trays include alginate, agar, and rubber. However, individual trays made from these materials have problems such as poor flexibility, low hardness, long curing time, and complicated usage steps (for example, alginate materials need to be mixed with water, and silicone materials need to be baked for a long time). These problems make the application of these materials as individual trays inconvenient. Summary of the Invention

[0004] In view of this, the present invention provides an impression composition, an impression material, an impression and a method for preparing the same, which can solve the above-mentioned technical problems.

[0005] Specifically, the following technical solutions are included:

[0006] On one hand, an impression composition is provided, the impression composition comprising the following components in weight percentages: 10%-25% oligomer, 1%-5% acrylate monomer, 0.05%-1% photoinitiator, 0.5%-2% dispersant, and 62%-85% silica filler;

[0007] The oligomers include polyurethane acrylates with a functionality of 3-9.

[0008] In some possible implementations, the polyurethane acrylate has a viscosity greater than 10,000 cps at 60°C.

[0009] In some possible implementations, the polyurethane acrylate is at least one of polyester-type polyurethane, polycarbonate-type polyurethane, and polyether-type polyurethane.

[0010] In some possible implementations, the oligomer further includes bisphenol A epoxy acrylate, and the mass ratio of the polyurethane acrylate to the bisphenol A epoxy acrylate is 1 to 3:1.

[0011] In some possible implementations, the acrylate monomer is at least two of monofunctional acrylates, difunctional acrylates, and trifunctional acrylates.

[0012] In some possible implementations, the monofunctional acrylate is selected from at least one of hydroxyethyl acrylate, butyl acrylate, isooctyl acrylate, isobornyl acrylate, cyclohexyl acrylate, n-hexyl acrylate, phenoxyethyl acrylate, and tetrahydrofuran acrylate.

[0013] The difunctional acrylate is selected from at least one of polyethylene glycol dimethacrylate, 1,6-hexanediol diacrylate, bisphenol A diacrylate, and tripropylene glycol diacrylate;

[0014] The trifunctional acrylate is selected from at least one of pentaerythritol triacrylate and trimethylolpropane triacrylate.

[0015] In some possible implementations, the photoinitiator includes at least one of 2,4,6-trimethylbenzoyl)diphenylphosphine oxide, phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, 2-methyl-1-[4-(methylthio)phenyl]-2-(4-morpholinyl)-1-propanone, and 2-benzyl-2-dimethylamino-1-(4-morpholinyl)butanone.

[0016] In some possible implementations, the refractive index of the polyurethane acrylate is 1.46-1.50;

[0017] The refractive index of the silica filler is 1.46-1.48.

[0018] In some possible implementations, the silica filler includes fumed silica and powdered silica;

[0019] The fumed silica is present in the impression material at a mass percentage of 1%-5%.

[0020] The powdered silica accounts for 70%-80% of the mass percentage of the impression material.

[0021] In some possible implementations, the particle size of the powdered silica is 50 μm-100 μm.

[0022] In some possible implementations, the powdered silica is surface-modified with a silane coupling agent.

[0023] On the other hand, an impression material is provided, which is prepared from any of the above-mentioned impression compositions.

[0024] In some possible implementations, the impression material is a light-curable dental individual tray.

[0025] Furthermore, a method for preparing an impression mold is provided, the method comprising:

[0026] An impression composition is provided, said impression composition as shown in any of the above: oligomer, acrylate monomer, photoinitiator and dispersant are stirred evenly at 50°C-60°C, and then silica filler is added and stirred evenly to obtain the impression composition;

[0027] An impression material is provided, the impression material being as described in any of the above: the impression composition is placed in a mold, and the mold is pressed using a tablet press to obtain the impression material;

[0028] The impression material is subjected to shaping and photocuring processes in sequence to obtain an impression.

[0029] In some possible implementations, the shaping process is a tooth shaping process.

[0030] On the other hand, an impression is provided, which is prepared by any of the methods described above.

[0031] The beneficial effects of the technical solutions provided in the embodiments of the present invention include at least the following:

[0032] The impression composition provided in this invention utilizes a rationally proportioned mixture of polyurethane acrylate oligomers, acrylate monomers, photoinitiators, dispersants, and silica fillers to form an impression composition. Before use, the impression composition is prepared by uniformly mixing the above-mentioned raw materials and further molded into an impression material of a certain thickness (e.g., 1.4mm-2.5mm thickness) using a mold. This impression material exhibits excellent bending resistance (i.e., tear resistance), curing performance (with a thickness of 1.4-2.5mm, the curing degree can reach over 90% after 1-3 minutes of irradiation), detail reproduction (capable of high-precision replication of dental models with clear details), and storage stability (can be stored in the dark for extended periods).

[0033] When using it, the impression material is placed on a model (such as a dental model) for shaping, and the impression material is directly irradiated with light to obtain a high-hardness and high-strength impression. The operation steps are simple and convenient, the curing time is appropriate and controllable, the degree of curing is high, and it has good dimensional stability during curing (no shrinkage or other phenomena will occur).

[0034] As can be seen, the impression composition provided in the embodiments of the present invention effectively solves the problems of poor flexibility, poor hardness, long curing time, and cumbersome use steps of the currently known impression materials (individual trays), making the impression composition provided in the embodiments of the present invention more convenient to be applied in clinical practice, and is particularly suitable for the preparation of dental individual trays. Detailed Implementation

[0035] To make the technical solution and advantages of this application clearer, the embodiments of this application will be described in further detail below.

[0036] In actual clinical practice, the oral morphology and alveolar ridge conditions of different patients vary greatly. Pre-made trays cannot meet the individual dental arch and alveolar ridge conditions of each patient. Currently, it is common practice to make individual trays for secondary impression taking to improve the accuracy of the impression, meet the individual differences of patients, and ensure the restorative effect of complete dentures.

[0037] Currently known materials used to make individual trays include alginate, agar, and rubber. However, individual trays made from these materials have problems such as poor flexibility, low hardness, long curing time, and complicated usage steps (for example, alginate materials need to be mixed with water, and silicone materials need to be baked for a long time). These issues make the application of these materials as individual trays inconvenient.

[0038] To overcome the above-mentioned technical problems, embodiments of the present invention provide an impression composition comprising the following components in weight percentages: 10%-25% oligomer, 1%-5% acrylate monomer, 0.05%-1% photoinitiator, 0.5%-2% dispersant, and 62%-85% silica filler; wherein the oligomer comprises polyurethane acrylate with a functionality of 3-9.

[0039] Among them, polyurethane acrylate has a functionality of 3-9, which can provide good curability, allowing the impression composition to cure to more than 90% within a suitable time, and helps to avoid shrinkage during curing, thereby ensuring good dimensional stability. This makes the prepared impression material particularly suitable for use as individual dental trays.

[0040] The impression composition provided in this invention utilizes a rationally proportioned mixture of polyurethane acrylate oligomers, acrylate monomers, photoinitiators, dispersants, and silica fillers to form an impression composition. Before use, the impression composition is prepared by uniformly mixing the above-mentioned raw materials and further molded into an impression material of a certain thickness (e.g., 1.4mm-2.5mm thickness) using a mold. This impression material exhibits excellent bending resistance (i.e., tear resistance), curing performance (with a thickness of 1.4-2.5mm, the curing degree can reach over 90% after 1-3 minutes of irradiation), detail reproduction (capable of high-precision replication of dental models with clear details), and storage stability (can be stored in the dark for extended periods).

[0041] When using it, the impression material is placed on a model (such as a dental model) for shaping, and the impression material is directly irradiated with light to obtain a high-hardness and high-strength impression. The operation steps are simple and convenient, the curing time is appropriate and controllable, the degree of curing is high, and it has good dimensional stability during curing (no shrinkage or other phenomena will occur).

[0042] As can be seen, the impression composition provided in the embodiments of the present invention effectively solves the problems of poor flexibility, poor hardness, long curing time, and cumbersome use steps of the currently known impression materials (individual trays), making the impression composition provided in the embodiments of the present invention more convenient to be applied in clinical practice, and is particularly suitable for the preparation of dental individual trays.

[0043] The following provides an exemplary description of the specific types and functions of the components involved in the impression composition provided in the embodiments of the present invention:

[0044] In the impression composition provided in the embodiments of the present invention, the mass percentage of polyurethane acrylate oligomer is 10%-25%, including but not limited to: 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, etc.

[0045] In some examples, the viscosity of the polyurethane acrylate at 60°C is greater than 10,000 cps. This sufficiently high viscosity ensures the thickness of the prepared impression material and facilitates optimization of its bending resistance and detail reproduction. A viscosity below 10,000 cps is detrimental to the bending resistance of the impression material. Exemplarily, the viscosity of the polyurethane acrylate at 60°C can be 10,000, 15,000, 20,000, 25,000, 30,000, 35,000, 40,000, 45,000, or 50,000 cps, preferably 10,000-30,000 cps.

[0046] Furthermore, in addition to meeting the above viscosity requirements, the polyurethane acrylate is at least one of polyester-type polyurethane, polycarbonate-type polyurethane, and polyether-type polyurethane, and all of the above polyurethane acrylates are suitable for the impression composition of the present invention.

[0047] For example, the polyurethane acrylate oligomers mentioned above include, but are not limited to: Sartoma CN989NS, Sartoma CN9013NS, Sartoma CN9025NS, Sartoma CN8885NS, DYMAX BR-144B, Guangzhou Songda SD7542, Guangzhou Songda SD7559, etc.

[0048] Furthermore, the oligomers provided in the embodiments of the present invention also include bisphenol A type epoxy acrylate, and the mass ratio of polyurethane acrylate to bisphenol A type epoxy acrylate is 1 to 3:1. Bisphenol A type epoxy acrylate contains a benzene ring structure, which is beneficial for providing rapid curing characteristics and for improving the hardness of the cured layer.

[0049] For example, the bisphenol A type epoxy acrylate is at least one of ethoxylated bisphenol A type epoxy acrylate and hydrogenated bisphenol A type epoxy acrylate.

[0050] In the impression composition provided in this embodiment of the invention, acrylate monomers may optionally be used, allowing the acrylate monomers to work in combination with polyurethane acrylate oligomers, thereby further improving the hardness and toughness of the impression material. When acrylate monomers are used, the mass percentage of the acrylate monomers can be 1%-5%, including but not limited to: 1%, 2%, 3%, 4%, 5%, etc.

[0051] In some examples, the acrylate monomers are at least two of monofunctional acrylates, difunctional acrylates, and trifunctional acrylates, which can further optimize the hardness and toughness of the impression material.

[0052] For example, the aforementioned monofunctional acrylates include hydroxyethyl acrylate, butyl acrylate, isooctyl acrylate, isobornyl acrylate, cyclohexyl acrylate, n-hexyl acrylate, phenoxyethyl acrylate, tetrahydrofuran acrylate, etc.; difunctional acrylates include at least one of polyethylene glycol dimethacrylate, 1,6-hexanediol diacrylate, bisphenol A diacrylate, and tripropylene glycol diacrylate, etc.; and trifunctional acrylates include trimethylolpropane triacrylate, pentaerythritol triacrylate, trimethylolpropane triacrylate, etc.

[0053] For example, the acrylate monomers are selected from at least two of hydroxyethyl acrylate, polyethylene glycol dimethacrylate, and trimethylolpropane triacrylate.

[0054] In the impression composition provided in the embodiments of the present invention, the mass percentage of photoinitiator is 0.05%-1%, which includes, but is not limited to: 0.05%, 0.08%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, etc.

[0055] In some examples, the photoinitiator includes at least one of 2,4,6-trimethylbenzoyl)diphenylphosphine oxide (photoinitiator TPO), phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide (photoinitiator 819), 2-methyl-1-[4-(methylthio)phenyl]-2-(4-morpholinyl)-1-propanone (photoinitiator 907), and 2-benzyl-2-dimethylamino-1-(4-morpholinylphenyl)butanone (photoinitiator 369).

[0056] The aforementioned photoinitiators have a positive effect on improving the photocuring speed and curing degree of the printing material.

[0057] In the impression composition provided in the embodiments of the present invention, the impression is endowed with sufficient hardness and strength by silica filler, wherein the mass percentage of silica filler is 62%-85%, including but not limited to: 62%, 65%, 68%, 70%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, etc.

[0058] In some examples, embodiments of the present invention specifically use a polyurethane acrylate with a refractive index of 1.46 to 1.5 and a silica filler with a refractive index of 1.46 to 1.48. In this way, the refractive indices of the polyurethane acrylate and the silica filler are close, which can achieve the purpose of matting and make the impression material system have high transparency, so as to ensure that the system can absorb UV energy more uniformly and optimize its curing performance.

[0059] Furthermore, in this embodiment of the invention, polyurethane acrylate oligomers and optional acrylate monomers are specifically used. Without affecting the advantages of the above raw materials, in order to improve the sufficient hardness and strength of the impression material system, this embodiment of the invention specifically includes silica filler comprising: fumed silica and powdered silica. The mass percentage of fumed silica in the impression composition is 2%-5%, and the mass percentage of powdered silica in the impression composition is 60%-80%.

[0060] Fumed silica is nanoscale and has the effect of increasing the viscosity and preventing sedimentation of the impression material system. Furthermore, its mass percentage is controlled to be less than 5% to ensure its uniform dispersion in the impression composition.

[0061] Powdered silica, at the micron level, serves to further increase the strength and hardness of the impression material system.

[0062] For example, the particle size of the powdered silica applicable to the embodiments of the present invention is 50μm-100μm. Within the above particle size range, the powdered silica can not only optimize the strength and hardness of the impression material system, but also does not affect its bending resistance and detail reproduction. This is because if the particle size is less than 50μm, the strengthening and hardening effect is not obvious, and if the particle size is greater than 100μm, it is easy to stratify and settle.

[0063] Furthermore, the powdered silica is surface-modified using a silane coupling agent. Exemplarily, the silane coupling agent includes, but is not limited to, at least one of: γ-aminopropyltriethoxysilane (silane coupling agent KH-550), γ-(2,3-epoxypropoxy)propyltrimethoxysilane (silane coupling agent KH-560), γ-methacryloyloxypropyltrimethoxysilane (silane coupling agent KH-570), and 3-mercaptopropyltriethoxysilane (silane coupling agent KH-580).

[0064] The surface of powdered silica is treated with a silane coupling agent to change it from hydrophilic to hydrophobic, thereby increasing the compatibility of the impression composition system and preventing phenomena such as cracking after bending of the impression material.

[0065] In some examples, silane coupling agents are used to surface-treat powdered silica, including the following steps:

[0066] Anhydrous ethanol and water are mixed and stirred evenly at a mass ratio of 1 to 9:1 to prepare material A. Material A and silane coupling agent are mixed and stirred evenly at a mass ratio of 1 to 4:1 to prepare material B. Through the above operations, the silane coupling agent is hydrolyzed to produce silanol.

[0067] Material B and powdered silica are mixed and stirred evenly at a mass ratio of 2–10:98 to prepare material C. Through this operation, silanols are adsorbed onto the surface of the powdered silica.

[0068] Material C is placed in an oven at 100℃-120℃ and heated for at least 30 minutes to obtain surface-treated powdered silica. This high-temperature operation dehydrates the hydrolyzed silanol and powdered silica, forming Si-O-Si bonds, thus achieving the purpose of treating the silica powder.

[0069] In this embodiment of the invention, a dispersant is used to fully and uniformly disperse the impression composition system, resulting in a homogeneous texture and ensuring that its overall performance reaches the desired level. Exemplarily, the dispersant includes BYK-110, BYK111, BYK 163, BYK2163, and BYK P-104S.

[0070] In the impression composition provided in the embodiments of the present invention, the mass percentage of the dispersant is 0.5%-2%, including but not limited to: 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.5%, 1.7%, 1.8%, 1.9%, 2%, etc.

[0071] Considering the components and their contents in the above-mentioned impression composition, within the content range defined in the embodiments of the present invention, the oligomers, acrylate monomers, photoinitiators, dispersants, and silica fillers can work synergistically to exert their respective advantages, so that the impression composition provided in the embodiments of the present invention has at least the following advantages:

[0072] It has a suitable curing time (tested to be 1-3 minutes), ensuring sufficient time to adjust its accuracy during shaping, and the short curing time saves time and is convenient, improving clinical work efficiency; it meets the curing depth requirements (tested to be able to cure when the thickness of the impression material is 1.2-2.5mm); it has good storage stability (stability tests show that the impression material can be stored stably for more than 3 years); it has good plasticity and bending resistance (tested to withstand at least 100 bends without cracking); it has sufficient strength and hardness (tested to have a hardness of at least 80HD after curing); it is non-toxic and non-irritating, with good biocompatibility; it has good accuracy and shape stability; and it is easy to operate.

[0073] On the other hand, embodiments of the present invention also provide an impression material, which is prepared from any of the impression compositions described above provided in embodiments of the present invention.

[0074] For example, the impression material can be a light-curable dental individual tray.

[0075] The impression material provided in this invention embodiment is based on the above-mentioned impression composition, resulting in an impression material with high hardness and high degree of curing. Furthermore, the application process of this impression material is simpler and more convenient; after shaping, the impression material can be directly cured using a light-curing method to obtain an impression. The curing time is suitable and controllable, the degree of curing is high, and it exhibits good dimensional stability during curing. The impression composition provided in this invention embodiment can be more conveniently applied in clinical applications, and is particularly suitable for preparing individual dental trays.

[0076] Furthermore, embodiments of the present invention also provide a method for preparing an impression mold, the method comprising:

[0077] An impression composition is provided, which is as described above in the embodiments of the present invention: oligomers, acrylate monomers, photoinitiators and dispersants are stirred evenly at 50°C-60°C, and then silica filler is added and stirred evenly to obtain the impression composition.

[0078] An impression material is provided, as described above in the embodiments of the present invention: the impression composition is placed in a mold, and pressure is applied to the mold using a tablet press to obtain the impression material. For example, the mold may be a mold for preparing individual dental trays.

[0079] For impression materials, it has excellent bending resistance (i.e., tear resistance), detail reproduction and storage stability.

[0080] The impression material is subjected to shaping and light curing processes in sequence to obtain an impression. For example, the shaping process is a tooth shaping process.

[0081] In use, the impression material is shaped and then light-cured to obtain an impression of a certain shape, such as an impression of a dental tray.

[0082] For example, the impression material can be cured by irradiating it with a UV light source with a wavelength of 365nm-405nm for 1min-3min.

[0083] It is evident that high-hardness molds can be obtained by directly curing the mold material using photocuring. The mold material has a wide range of suitable light source wavelengths (365-405nm), the curing time is suitable and controllable, the degree of curing is high, and it exhibits good dimensional stability during curing.

[0084] Based on the above-described method for preparing an impression mold provided in the embodiments of the present invention, the embodiments of the present invention also provide an impression mold prepared by the above-described method for preparing an impression mold.

[0085] Preferred embodiments of the present invention will now be described in more detail. While preferred embodiments of the present invention are described below, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Where specific techniques or conditions are not specified in the embodiments, they are performed in accordance with techniques or conditions described in the literature in the art or according to product instructions. Reagents or instruments whose manufacturers are not specified are all conventional products that can be obtained commercially.

[0086] In the following embodiments, the fumed silica involved is Evonik Degussa hydrophobic fumed silica R972. The surface-treated spherical silica powders involved are all prepared by the following method:

[0087] Anhydrous ethanol and water were mixed at a mass ratio of 9:1 and stirred until homogeneous to prepare material A. Material A and silane coupling agent KH550 were mixed at a mass ratio of 4:1 and stirred until homogeneous to prepare material B. Material B and powdered silica were mixed at a mass ratio of 2:98 and stirred until homogeneous to prepare material C. Material C was placed in an oven at 105℃ and heated for 30 minutes to obtain surface-treated powdered silica.

[0088] Example 1, Example 2, Example 3, Example 4 and Example 5 each provide an impression composition, the composition of which is shown in Tables 1, 2, 3, 4 and 5 below.

[0089] Sartoma CN9013NS is a polyester-type polyurethane oligomer with a viscosity of 15000cps at 60℃, a refractive index of 1.49, and a functionality of 9.

[0090] DYMAX BR-144B is a polyether-type polyurethane oligomer with a viscosity of 20,000 cps at 60℃, a refractive index of 1.48, and a functionality of 3.

[0091] Sartoma CN9025NS is a polyester-type polyurethane oligomer with a viscosity of 24,000 at 60°C, a refractive index of 1.49, and a functionality of 6.

[0092] Guangzhou Songda SD7542 is a polycarbonate-type polyurethane oligomer with a viscosity of 18,000 at 60℃, a refractive index of 1.47, and a functionality of 3.

[0093] Table 1

[0094]

[0095] Table 2

[0096]

[0097] Table 3

[0098]

[0099] Table 4

[0100]

[0101] Table 5

[0102]

[0103] Test case

[0104] Imprint materials were prepared using the impression compositions provided in Examples 1-5, respectively, and the impression materials were prepared by the following methods:

[0105] Oligomers, acrylate monomers, photoinitiators, and dispersants are added to a double planetary mixer and stirred at 60°C until homogeneous. While maintaining the temperature at 60°C and stirring, fumed silica is added and stirred until homogeneous. Then, spherical silica powder with surface treatment is added in batches and stirred until homogeneous to obtain the raw material mixture.

[0106] The raw material mixture was placed in a mold, and pressure was applied to the mold using a tablet press to compress it into a sheet with a thickness of 1.4 mm, thus obtaining the impression material. This mold is used to prepare individual dental trays; that is, the impression material is for individual trays. The viscosity of the impression composition (measured using a cone-plate viscometer at 60°C) and the bending resistance of the impression material were tested, and the test results are listed in Table 6.

[0107] Then, the intermediate mold was irradiated with a UV light source with a power of 60W and a wavelength of 395nm for 1min-3min to obtain a cured sheet-like mold. The curing time was used to characterize the curing speed.

[0108] The curing degree of the impression was tested using an infrared spectrometer, specifically the double bond conversion rate of the impression before and after curing, with a required curing degree >90%.

[0109] The hardness of the thin sheet-like impression was tested using a Shore hardening tester. The thickness was 1.4 mm. The test results are listed in Table 6.

[0110] Table 6

[0111]

[0112] As shown in Table 6, the impression composition provided in the embodiments of the present invention has a high viscosity, the formed impression material does not crack after being bent 150 times, and a suitable curing time, which makes it convenient for operators to make precision adjustments during shaping. At the same time, it also makes the impression mold formed after curing have a hardness of more than 80HD.

[0113] The above description is merely for the purpose of enabling those skilled in the art to understand the technical solutions of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An impression composition, characterized in that, The impression composition comprises the following components in weight percentages: 10%-25% oligomer, 1%-5% acrylate monomer, 0.05%-1% photoinitiator, 0.5%-2% dispersant, and 62%-85% silica filler; The oligomers include polyurethane acrylates with a functionality of 3-9; The oligomer also includes bisphenol A epoxy acrylate, and the mass ratio of the polyurethane acrylate to the bisphenol A epoxy acrylate is 1~3:1; The silica filler includes fumed silica and powdered silica; The fumed silica is present in the impression composition at a mass percentage of 1%-5%; The powdered silica accounts for 70%-80% by mass in the impression composition; The powdered silica has a particle size of 50μm-100μm and is surface modified by a silane coupling agent.

2. The impression composition according to claim 1, characterized in that, The viscosity of the polyurethane acrylate at 60°C is greater than 10,000 cps.

3. The impression composition according to claim 2, characterized in that, The polyurethane acrylate is at least one of polyester-type polyurethane, polycarbonate-type polyurethane, and polyether-type polyurethane.

4. The impression composition according to claim 1, characterized in that, The acrylate monomers are at least two of the following: monofunctional acrylates, difunctional acrylates, and trifunctional acrylates.

5. The impression composition according to claim 4, characterized in that, The monofunctional acrylate is selected from at least one of hydroxyethyl acrylate, butyl acrylate, isooctyl acrylate, isobornyl acrylate, cyclohexyl acrylate, n-hexyl acrylate, phenoxyethyl acrylate, and tetrahydrofuran acrylate. The difunctional acrylate is selected from at least one of polyethylene glycol dimethacrylate, 1,6-hexanediol diacrylate, bisphenol A diacrylate, and tripropylene glycol diacrylate; The trifunctional acrylate is selected from at least one of pentaerythritol triacrylate and trimethylolpropane triacrylate.

6. The impression composition according to claim 1, characterized in that, The photoinitiator includes at least one of 2,4,6-trimethylbenzoyl)diphenylphosphine oxide, phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, 2-methyl-1-[4-(methylthio)phenyl]-2-(4-morpholino)-1-propanone, and 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)butanone.

7. The impression composition according to claim 1, characterized in that, The refractive index of the polyurethane acrylate is 1.46-1.50; The refractive index of the silica filler is 1.46-1.

48.

8. An impression material, characterized in that, The impression material is prepared from the impression composition according to any one of claims 1-7.

9. The impression material according to claim 8, characterized in that, The impression material is a light-curable dental individual tray.

10. A method for preparing an impression mold, characterized in that, The method for preparing the impression includes: The oligomer, acrylate monomer, photoinitiator and dispersant are stirred evenly at 50℃-60℃, and then silica filler is added and stirred evenly to obtain the impression composition, wherein the impression composition is the impression composition as described in any one of claims 1-7. The impression composition is placed in a mold, and pressure is applied to the mold using a tablet press to obtain the impression material; The impression material is subjected to shaping and photocuring processes in sequence to obtain an impression.

11. The method for preparing an impression according to claim 10, characterized in that, The shaping process is a tooth shaping process.

12. A printing mold, characterized in that, The impression is prepared using the method described in claim 10 or 11.

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