Dental glazing paste, preparation method therefor, and use thereof

Abstract

The present disclosure provides a dental glazing paste, a preparation method therefor, and use thereof, and relates to the technical field of dental materials. The dental glazing paste provided by the present disclosure comprises the following components: 32-75 parts by mass of glass powder, 0-120 parts by mass of a solvent, and 0.05-5 parts by mass of a metal compound. The valence state of a metal in the metal compound is +1 valence and / or +2 valence. According to the present disclosure, by adding the metal compound, the effect of reducing the glass film-forming melting point is achieved, the sintering film-forming temperature of the dental glazing paste is reduced, the preparation energy loss of a dental prosthesis is effectively reduced, the processing efficiency of the dental prosthesis is improved, and the application range of the dental glazing paste is expanded; and furthermore, the fluidity and the suspension stability of the dental glazing paste can be improved, such that the dental glazing paste has more excellent spreadability and better brushing hand feeling, and thus is convenient to operate.

Description

Dental glaze paste and its preparation method and application

[0001] Cross-references to related publications

[0002] The present disclosure claims priority to Chinese Patent No. 2024101961828, filed on February 22, 2024, entitled “A dental glaze paste, its preparation method and application”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present disclosure relates to the technical field of dental materials, and in particular to a dental glaze paste and a preparation method and application thereof. Background Art

[0004] Dental ceramic materials are favored in restorative dentistry due to their excellent mechanical properties and aesthetically pleasing appearance similar to natural teeth. As people's pursuit of aesthetics continues to improve, so too does their desire for a more natural and lifelike appearance in dental restorations. This has given rise to the development of glazing pastes. Glazing pastes are applied to the surface of the restoration substrate, sintered at high temperatures, and then cooled to form a smooth glaze. This aesthetic treatment of the restoration surface can achieve a more realistic and natural appearance.

[0005] Currently, low sintering temperatures for glazing pastes are increasingly sought after by major denture manufacturers. This low sintering temperature allows glazing pastes to be applied to a wider range of ceramic abutment products. It also effectively reduces energy consumption and improves denture production efficiency, while ensuring product quality, significantly lowering processing costs.

[0006] Chinese patent CN112638349A discloses a glazing composition for dental zirconia products, comprising a liquid, glass particles, and hydrophilic silica nanoparticles. This prior art, by adding hydrophilic silica, allows for better glaze particle accumulation. The composition is sintered at 1350-1600°C to form a film, addressing the problem of bubbles and other defects that affect the aesthetics of the glaze during the coating and sintering process. Chinese patent CN111467246A discloses a dental ceramic paste comprising glass powder, hydrophobicized silica microparticles modified with a silane coupling agent, and an organic solvent. This prior art incorporates hydrophobic silica to maintain the paste for extended periods. Furthermore, without the addition of additional polymer components, the composition is sintered at 650-850°C to form a film, addressing the potential for carbonization, blackening, or bubbles caused by polymer components. However, the sintering and film-forming temperatures of the glazed products disclosed in this prior art are high. Summary of the Invention

[0007] In view of this, the purpose of the present disclosure includes providing a dental glaze paste and a preparation method and application thereof. The dental glaze paste provided by the present disclosure has a low film-forming temperature during firing.

[0008] In order to achieve the above-mentioned disclosure objectives, the technical solutions provided by this disclosure include:

[0009] The present disclosure provides a dental glaze paste, which comprises the following components, calculated by weight: 32 to 75 parts of glass powder, 12.5 to 120 parts of solvent, and 0.05 to 5 parts of a metal compound; the valence of the metal in the metal compound is +1 and / or +2.

[0010] In some optional embodiments, the particle size of the glass powder is 3 to 35 μm.

[0011] In some optional embodiments, the solvent includes an organic solvent and / or water; and the boiling point of the solvent is ≤350°C.

[0012] In some optional embodiments, the organic solvent includes an alcohol solvent.

[0013] In some optional embodiments, the alcohol solvent includes one or more of butanediol, propylene glycol, ethylene glycol, pentanediol, hexanediol and glycerol.

[0014] In some optional embodiments, the refractive index of the glass powder is 1.487 to 1.657.

[0015] In some optional embodiments, the absolute value of the refractive index difference between the glass powder and the solvent is 0 to 0.3.

[0016] In some alternative embodiments, the metal compound includes a metal inorganic salt and / or a metal oxide.

[0017] In some optional embodiments, the anions in the metal inorganic salt include one or more of halide ions, nitrate, phosphate, sulfate, acetate and carbonate.

[0018] In some optional embodiments, the metal in the metal compound includes one or more of alkali metals, alkaline earth metals, and Group II non-radioactive metals.

[0019] In some optional embodiments, the component further includes a colorant, and the colorant includes a fluorescent agent and / or a colorant.

[0020] The present disclosure provides a method for preparing the dental glazing paste according to the above technical solution, comprising the following steps: mixing a solvent, glass powder and a metal compound to obtain the dental glazing paste.

[0021] The present disclosure also provides the use of the dental glaze paste of the above technical solution or the dental glaze paste prepared by the preparation method of the above technical solution in dental restorations.

[0022] The present disclosure provides a dental glaze paste comprising the following components, measured by mass: 32 to 75 parts of glass powder, 12.5 to 120 parts of solvent, and 0.05 to 5 parts of a metal compound; the absolute value of the refractive index difference between the glass powder and the solvent is 0 to 0.3; and the valence of the metal in the metal compound is +1 and / or +2. By adding the metal compound, the present disclosure not only lowers the melting point of the glass film, lowers the sintering film-forming temperature of the dental glaze paste, effectively reduces energy consumption in the preparation of dental restorations, improves the processing efficiency of dental restorations, and expands the application range of the dental glaze paste, but also improves the fluidity and suspension stability of the dental glaze paste, resulting in the dental glaze paste having better spreadability, a better brushing feel, and ease of operation.

[0023] Furthermore, the present invention controls the absolute value of the refractive index difference between the glass powder and the solvent to be 0-0.3, so that the refractive index of the glass powder and the solvent is well matched. When light passes through the glass powder and the solvent, two media with similar or identical refractive indices, the optical properties exhibited are similar or identical. The color and transparency perceived by the senses are closer to those provided by a single substance, thereby achieving excellent coating and use effects of the dental glaze paste, good gloss and aesthetics, and providing an aesthetic effect close to that of real teeth. DETAILED DESCRIPTION

[0024] The present disclosure provides a dental glaze paste, which comprises the following components, calculated by weight: 32 to 75 parts of glass powder, 12.5 to 120 parts of solvent, and 0.1 to 5 parts of metal compound;

[0025] The valence state of the metal in the metal compound is +1 and / or +2.

[0026] Unless otherwise specified, the materials and equipment used in this disclosure are commercially available products in the art.

[0027] The dental glaze paste provided herein comprises 32 to 75 parts by mass of glass powder, preferably 38.5 to 75 parts, more preferably 39.5 to 75 parts, and even more preferably 40 to 75 parts. In the present disclosure, the particle size of the glass powder is preferably 3 to 35 μm, more preferably 7 to 20 μm. In the present disclosure, the glass powder preferably comprises one or more of glass powder A, glass powder B, Si-B-Ca-Ti glass powder, and borosilicate glass powder.

[0028] In the present disclosure, the composition of the glass powder A preferably includes, by mass percentage, SiO2 50-65% (e.g., 50%, 55%, 60% or 65%), Al2O3 5-15% (e.g., 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14% or 15%), B2O3 8-17% (e.g., 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16% or 17%), Na2O 0.5-5% (e.g., 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5% or 5%), K2O 0.5-7% (such as 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5% or 7%), Li2O 0.5-7% (such as 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5% or 7%), alkaline earth metal oxide 4-11% (such as 4%, 5%, 6%, 7%, 8%, 9%, 10% or 11%), Y2O3 0-2% (such as 0%, 0.5%, 1%, 1.5% or 2%, etc.), fluoride 0.5-5% (such as 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5% or 5%, etc.); the alkaline earth metal oxide includes one or more of MgO, CaO and BaO, and the fluoride preferably includes NaF and / or CaF2.

[0029] In the present disclosure, the composition of the glass powder B preferably includes, by mass percentage, SiO2 50-65% (such as 50%, 55%, 60% or 65%), Al2O3 5-15% (such as 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14% or 15%), B2O3 8-17% (such as 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16% or 17%), Na2O 0.5-5% (such as 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5% or 5%), K2O 0.5-7% (such as 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5% or 7%), Li2O 0.5-7% (such as 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5% or 7%, etc.), alkaline earth metal oxide 4-11% (such as 4%, 5%, 6%, 7%, 8%, 9%, 10% or 11%, etc.), fluoride 0.5-5% (such as 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5% or 5%, etc.); alkaline earth metal oxide includes one or more of MgO, CaO and BaO, and fluoride preferably includes NaF and / or CaF2.

[0030] In the present disclosure, the preparation method of glass powder A preferably includes the following steps: high-temperature melting of raw materials and then water quenching to obtain glass slag material, and crushing the glass slag material to obtain glass powder A. In the present disclosure, the high-temperature melting temperature is preferably 1300-1560°C (such as 1300°C, 1350°C, 1400°C, 1450°C, 1500°C, 1550°C or 1560°C, etc.), more preferably 1400-1450°C; the high-temperature melting time is preferably 1-8 hours (such as 1 hour, 2 hours, 3 hours, 4 hours, 5 hours, 6 hours, 7 hours or 8 hours, etc.), more preferably 2-4 hours. In the present disclosure, the preparation method of glass powder B is preferably the same as the preparation method of glass powder A, and will not be repeated here.

[0031] In the present disclosure, the refractive index of the glass powder is preferably 1.487 to 1.657, more preferably 1.529 to 1.657, and even more preferably 1.55 to 1.657.

[0032] The dental glaze paste provided in the present disclosure includes 12.5 to 120 parts by mass of a solvent (e.g., 12.5, 20, 40, 60, 80, 100, or 120 parts), preferably 15 to 100 parts, more preferably 20 to 80 parts, and even more preferably 30 to 70 parts. In the present disclosure, the refractive index of the solvent is preferably 1.333 to 1.45, more preferably 1.357 to 1.434, and specifically preferably 1.333, 1.357, 1.4245, 1.434, 1.436, or 1.450. In the present disclosure, the boiling point of the solvent is preferably ≤350°C, more preferably 100 to 250°C (e.g., 100°C, 150°C, 200°C, or 250°C), and even more preferably 150 to 200°C.

[0033] In the present disclosure, a solvent with a boiling point that is too high will prolong the drying time of the dental glaze paste and increase the total sintering time. A solvent with a boiling point that is too low will not allow for long-term storage of the product at room temperature. In the present disclosure, when the solvent is a mixed solvent, the solvents are mixed uniformly before the refractive index is measured using an Abbe refractometer. When the solvent is a single solvent, the refractive index is measured directly using an Abbe refractometer or referenced to the refractive index value provided by the manufacturer.

[0034] In the present disclosure, the absolute value of the refractive index difference between the glass powder and the solvent (denoted as |X|) is preferably 0-0.3, more preferably 0-0.2, further preferably 0-0.1, further preferably 0.037-0.1, and most preferably 0.053-0.1; when 0≤|X|≤0.1, the refractive index matching between the glass powder and the solvent is excellent; when 0.1<|X|≤0.2, the refractive index matching between the glass powder and the solvent is good; when 0.2<|X|≤0.3, the refractive index matching between the glass powder and the solvent is acceptable; when |X|>0.3, the refractive index matching between the glass powder and the solvent is unacceptable.

[0035] The refractive index of the glass powder itself and the refractive index of the solvent need to have a certain degree of matching. When light enters the solvent medium from the glass powder medium, the reflection and refraction are small, that is, when light passes through two media with similar or identical refractive indices, the optical properties they exhibit are similar or identical. The color and transparency seen sensorily are closer to the sensory perception provided by a single substance, which makes the coating and use of dental glaze paste more effective, and enables denture dyeing technicians to more accurately grasp the color matching during the dyeing process. The ceramic-based dentures produced have good gloss and beauty, providing an aesthetic effect close to that of real teeth.

[0036] In the present disclosure, the solvent preferably includes an organic solvent and / or water; the solvent preferably includes 0 to 60 parts of an organic solvent (such as 0 part, 5 parts, 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts or 60 parts, etc.), and the amount of the organic solvent is more preferably 10 to 50 parts, and further preferably 20 to 40 parts; 0 to 60 parts of water (such as 0 part, 5 parts, 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts or 60 parts, etc.), and the amount of water is more preferably 10 to 50 parts, and further preferably 20 to 40 parts; and the organic solvent and water are not 0 parts at the same time.

[0037] In the present disclosure, the organic solvent preferably includes an alcohol solvent, and the alcohol solvent preferably includes one or more of butanediol, propylene glycol, ethylene glycol, pentanediol, hexanediol and glycerol.

[0038] In parts by mass, the dental glaze paste provided by the present disclosure includes 0.05 to 5 parts of the metal compound (such as 0.05 parts, 0.1 parts, 0.5 parts, 1 parts, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts or 5 parts, etc.), preferably 0.1 to 5 parts, more preferably 0.2 to 1.5 parts, and even more preferably 0.3 to 0.5 parts.

[0039] In the present disclosure, the valence state of the metal in the metal compound is +1 and / or +2, and the metal preferably includes one or more of alkali metals, alkaline earth metals and non-radioactive metals of the second subgroup; the alkali metal preferably includes one or more of lithium, sodium and potassium; the alkaline earth metal preferably includes one or more of magnesium, calcium, strontium and barium; and the non-radioactive metal of the second subgroup preferably includes zinc.

[0040] In the present disclosure, the metal compound preferably includes a metal inorganic salt and / or a metal oxide. In the present disclosure, the anion in the metal inorganic salt preferably includes one or more of a halogen ion, a nitrate, a phosphate, a sulfate, an acetate, and a carbonate; the halogen ion preferably includes a chloride ion and / or a fluoride ion; the metal inorganic salt preferably includes one or more of sodium chloride, potassium chloride, lithium chloride, calcium chloride, zinc chloride, strontium chloride, barium chloride, zinc chloride, sodium fluoride, potassium fluoride, lithium nitrate, sodium nitrate, potassium nitrate, calcium nitrate, lithium nitrate, strontium nitrate, barium nitrate, zinc nitrate, sodium sulfate, potassium sulfate, sodium carbonate, potassium carbonate, sodium acetate, potassium acetate, zinc acetate, sodium phosphate, potassium phosphate, and zinc phosphate.

[0041] In parts by mass, the dental glaze paste provided in the present disclosure preferably includes 0 to 10 parts (e.g., 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 parts) of colorant, preferably 0.1 to 5 parts, and more preferably 0.5 to 2 parts. In the present disclosure, the colorant preferably includes a fluorescent agent and / or a colorant. The present disclosure does not specifically limit the fluorescent agent and / or colorant, and an inorganic fluorescent agent and / or colorant suitable for dental use can be used.

[0042] The present disclosure provides a method for preparing the dental glazing paste according to the above technical solution, comprising the following steps: mixing a solvent, glass powder and a metal compound to obtain the dental glazing paste.

[0043] In the present disclosure, mixing preferably includes mixing method one and mixing method two.

[0044] In the present disclosure, the first mixing method preferably includes: first mixing the metal compound and the solvent to obtain a first mixed liquid; and second mixing the first mixed liquid and the glass powder.

[0045] In the present disclosure, the second mixing method preferably includes: thirdly mixing the glass powder and the metal compound to obtain a mixed powder, and fourthly mixing the mixed powder with a solvent.

[0046] In the present disclosure, when the components of the dental glaze paste also include a pigment, the first mixing method preferably includes: first mixing the metal compound, the pigment and the solvent to obtain a first mixed liquid; second mixing the first mixed liquid with the glass powder; the second mixing method preferably includes: third mixing the glass powder, the metal compound and the pigment to obtain a mixed powder; and fourth mixing the mixed powder with the solvent.

[0047] When the present disclosure adopts mixing method 1, the dental glaze paste is mixed more evenly and the effect of reducing solid-liquid separation is better. In the present disclosure, the mixing method is stirring mixing.

[0048] The present disclosure also provides a dental glazing paste, or the use of the dental glazing paste prepared using the above-described method, in a dental restoration. In the present disclosure, the dental restoration preferably includes one or more of a veneer, a crown, an inlay, an onlay, and a bridge. In the present disclosure, the dental glazing paste is preferably used as a surface finishing layer on the dental restoration.

[0049] In order to further illustrate the present disclosure, the dental glaze paste, its preparation method and application are described in detail below with reference to the examples, but they should not be construed as limiting the scope of protection of the present disclosure.

[0050] In the following examples, the refractive index of glass powder is measured by adding the glass powder to a platinum crucible as a container for the glass powder, placing the crucible in a high-temperature furnace, and maintaining the temperature at 1400°C for 2 hours. The glass powder is then remelted into a flowing glass liquid, which is then poured into a graphite mold measuring (50±2) mm × (20±2) mm × (15±2) mm to form a glass frit. The cast glass frit, along with the mold, is then naturally cooled to room temperature and then annealed. The annealing process comprises the following steps: the glass frit, which has cooled to room temperature, is removed from the mold and placed in a sintering furnace for annealing. The annealing conditions are: maintaining the temperature at 450°C for 3 hours, cooling from 450°C to 300°C for 2 hours, cooling from 300°C to 150°C for 4 hours, and then cooling from 150°C to room temperature. After the annealing treatment is completed, the frit is processed into a long strip of (40±2) mm×(15±2) mm×(10±2) mm, and one side of the (40±2) mm×(15±2) mm surface in the rectangular block is ground and polished. 1 to 2 drops of brominated naphthalene are dropped between the polished surface and the test surface of the Abbe refractometer. The Abbe refractometer reads the data to obtain the refractive index of the glass powder.

[0051] Method for testing the refractive index of the solvent: When the solvent is a mixed solvent, mix the solvents evenly and then test the refractive index with an Abbe refractometer. When the solvent is a single solvent, directly test the refractive index with an Abbe refractometer or refer to the refractive index given by the manufacturer. The refractive index is shown in Table 1.

[0052] Si-B-Ca-Ti glass powder and borosilicate glass powder are commercially available glass powders, with refractive indices shown in Table 2 and other physical parameters shown in Table 1.

[0053] Calculated by mass percentage, the components of glass powder A include: SiO2 50-65%, Al2O3 5-15%, B2O3 8-17%, Na2O 0.5-5%, K2O 0.5-7%, Li2O 0.5-7%, alkaline earth metal oxide 4-11%, Y2O3 0-2%, and fluoride 0.5-5%; the alkaline earth metal oxide is one or a combination of MgO, CaO, and BaO, and the fluoride is NaF and / or CaF2.

[0054] Calculated by mass percentage, the composition of the glass powder B preferably includes: SiO2 50-65%, Al2O3 5-15%, B2O3 8-17%, Na2O 0.5-5%, K2O 0.5-7%, alkaline earth metal oxide 4-11%, Li2O 0.5-7%, and fluoride 0.5-5%; the alkaline earth metal oxide is one or more of MgO, CaO and BaO, and the fluoride is NaF and / or CaF2.

[0055] Preparation method of glass powder A and glass powder B: The raw materials are melted at 1400°C for 2 hours and then quenched with water to prepare glass slag, which is then crushed into glass powder. The refractive index of the glass powder is shown in Table 2, and other physical parameters are shown in Table 1.

[0056] Table 1 Physical parameters of glass powder

[0057] Example 1

[0058] According to the usage ratio in Table 2, the metal compound, the colorant and the solvent are first stirred and mixed to obtain a first mixed liquid; and the first mixed liquid and the glass powder are secondly stirred and mixed to obtain a dental glazing paste.

[0059] Table 2 Composition of dental glaze pastes in Examples 1 to 12 and Comparative Examples 1 to 2

[0060] Examples 2 to 12

[0061] A dental glaze paste was prepared according to the method of Example 1. The composition of the dental glaze paste is shown in Table 2.

[0062] Comparative Examples 1-2

[0063] A dental glaze paste was prepared according to the method of Example 1. The composition of the dental glaze paste is shown in Table 2.

[0064] Test Example 1

[0065] Performance test of dental glaze paste prepared in Examples and Comparative Examples

[0066] 1. Refractive index matching test of dental glaze paste

[0067] The refractive index matching degree is expressed by the absolute value of the result of the refractive index of glass powder minus the refractive index of solvent (|X|). When 0≤|X|≤0.1, the refractive index matching of glass powder and solvent is excellent; when 0.1<|X|≤0.2, the refractive index matching of glass powder and solvent is good; when 0.2<|X|≤0.3, the refractive index matching of glass powder and solvent is acceptable; when |X|>0.3, the refractive index matching of glass powder and solvent is unacceptable. The closer the refractive index of glass powder is to that of solvent, the better the effect of dental glaze paste.

[0068] 2. Evaluation of usage effect

[0069] For the formulation without added pigment, an A2-colored zirconia anterior single-crown restoration model was taken, and a dental glaze paste with a thickness of (500±50) μm was applied to the single crown. The transmittance of the tooth base color after the paste was applied was observed, and the transparency of the dental glaze paste was evaluated: very transparent, the use effect was evaluated as level 1; relatively transparent, the use effect was evaluated as level 2; slightly opaque, the use effect was evaluated as level 3; and opaque, the use effect was evaluated as level 4.

[0070] For the formula with added pigment, an A2-colored zirconia anterior tooth single-crown restoration model was taken, and a dental glaze paste with a thickness of (500±50) μm was applied to the single crown. The dental glaze paste was fired at 20°C below the bright temperature for 2 min. The color changes before and after sintering were compared and evaluated: no change, the use effect evaluation was level 1; slight difference, the use effect evaluation was level 2; small difference, the use effect evaluation was level 3; large difference, the use effect evaluation was level 4.

[0071] 3. Solid-liquid separation (suspension stability) and mixing difficulty assessment test

[0072] 4g of dental glaze paste was placed in a glass sample bottle and left for 7 and 14 days to observe solid-liquid separation. The dental glaze paste was then re-mixed after 14 days to assess the difficulty of re-mixing the dental glaze paste.

[0073] 4. Sintering effect test

[0074] Dental glaze paste (thickness of (500±50)μm) was coated on a single zirconia crown. The same glass powder was selected and fired using the same firing curve to evaluate the sintering film effect.

[0075] Different glass powders were fired at a temperature 20°C lower than the brightening temperature. The sintering curves are shown in Table 3 below.

[0076] Table 3 Sintering curves of different glass powders

[0077] Table 4 Refractive index matching, use effect, suspension stability, mixing difficulty and sintering effect results of the dental glaze pastes prepared in the examples and comparative examples

[0078] Among them, after sintering to maturity, it will appear in a transparent and bright glass state, and before sintering to maturity, it will appear whitish.

[0079] As shown in Table 4, the refractive index of the glass powder of the dental glaze paste provided by the present disclosure is close to that of the liquid, and the use effect is good without affecting the color of the dental restoration itself. The present disclosure adds a +1-valent and / or +2-valent metal compound so that the dental glaze paste can still be re-mixed into a paste after being placed for 14 days, without affecting the subsequent use of the dental glaze paste. However, Comparative Example 2, in which no +1-valent and / or +2-valent metal compound is added, becomes very difficult to mix during the 14-day placement process, and the user experience is poor, indicating that the addition of a +1-valent and / or +2-valent metal compound can improve the suspension stability of the dental glaze paste. From the sintering effect results, it can be seen that the +1-valent and / or +2-valent metal compound can improve the sintering effect and reduce the temperature of the dental glaze paste for sintering and film formation.

[0080] Although the above embodiments provide a detailed description of the present disclosure, they are only part of the embodiments of the present disclosure, not all of the embodiments. People can also obtain other embodiments based on the embodiments of the present disclosure without creative work, and these embodiments all fall within the scope of protection of the present disclosure. Industrial Applicability

[0081] The dental glaze paste provided by the present disclosure has a low sintering film-forming temperature, effectively reducing energy consumption in the preparation of dental restorations, improving processing efficiency, and expanding the application range of the dental glaze paste. It also improves the fluidity and suspension stability of the dental glaze paste, resulting in better spreadability, a better brushing feel, and ease of operation. The preparation method is simple and amenable to industrial production.

Claims

1. A dental glaze paste, characterized in that The composition comprises the following components in parts by mass: 32 to 75 parts of glass powder, 12.5 to 120 parts of solvent, and 0.05 to 5 parts of metal compound; The valence state of the metal in the metal compound is +1 and / or +2.

2. The dental glaze paste according to claim 1, characterized in that The particle size of the glass powder is 3 to 35 μm.

3. The dental glaze paste according to claim 1 or 2, characterized in that The glass powder includes at least one of glass powder A, glass powder B, Si-B-Ca-Ti glass powder and borosilicate glass powder.

4. The dental glaze paste according to claim 3, characterized in that The glass powder A comprises, in percentage by mass, 50-65% SiO2, 5-15% Al2O3, 8-17% B2O3, 0.5-5% Na2O, 0.5-7% K2O, 0.5-7% Li2O, 4-11% alkaline earth metal oxide, 0-2% Y2O3, and 0.5-5% fluoride. The alkaline earth metal oxide includes at least one of MgO, CaO and BaO, and the fluoride includes NaF and / or CaF2.

5. The dental glaze paste according to claim 3 or 4, characterized in that Calculated by mass percentage, the glass powder B comprises the following components: SiO2 50-65%, Al2O3 5-15%, B2O3 8-17%, Na2O 0.5-5%, K2O 0.5-7%, Li2O 0.5-7%, alkaline earth metal oxide 4-11%, and fluoride 0.5-5%; The alkaline earth metal oxide includes at least one of MgO, CaO and BaO, and the fluoride includes NaF and / or CaF2.

6. The dental glaze paste according to any one of claims 3 to 5, characterized in that The preparation method of the glass powder A comprises the following steps: melting raw materials at high temperature and then quenching them with water to obtain glass slag, and crushing the glass slag to obtain glass powder A; wherein the high temperature melting temperature is 1300-1560° C., and the high temperature melting time is 1-8 hours; And / or, the preparation method of the glass powder B comprises the following steps: high-temperature melting of the raw materials and then water quenching to obtain glass slag material, and crushing the glass slag material to obtain glass powder B; wherein the high-temperature melting temperature is 1300-1560°C, and the high-temperature melting time is 1-8 hours.

7. The dental glaze paste according to any one of claims 1 to 6, characterized in that The solvent includes an organic solvent and / or water; the boiling point of the solvent is ≤350°C.

8. The dental glaze paste according to claim 7, characterized in that The organic solvent includes an alcohol solvent; The alcohol solvent includes one or more of butanediol, propylene glycol, ethylene glycol, pentanediol, hexanediol and glycerol.

9. The dental glaze paste according to any one of claims 1 to 8, characterized in that The refractive index of the glass powder is 1.487 to 1.657; The absolute value of the refractive index difference between the glass powder and the solvent is 0 to 0.

3.

10. The dental glaze paste according to any one of claims 1 to 9, characterized in that The metal compound includes a metal inorganic salt and / or a metal oxide; The anions in the metal inorganic salt include one or more of halogen ions, nitrate, phosphate, sulfate, acetate and carbonate.

11. The dental glaze paste according to claim 10, characterized in that The halogen ions include chloride ions and / or fluoride ions.

12. The dental glaze paste according to claim 10 or 11, characterized in that The metal inorganic salt includes one or more of sodium chloride, potassium chloride, lithium chloride, calcium chloride, zinc chloride, strontium chloride, barium chloride, zinc chloride, sodium fluoride, potassium fluoride, lithium nitrate, sodium nitrate, potassium nitrate, calcium nitrate, lithium nitrate, strontium nitrate, barium nitrate, zinc nitrate, sodium sulfate, potassium sulfate, sodium carbonate, potassium carbonate, sodium acetate, potassium acetate, zinc acetate, sodium phosphate, potassium phosphate and zinc phosphate.

13. The dental glaze paste according to claim 1, characterized in that The metal in the metal compound includes one or more of alkali metals, alkaline earth metals and second subgroup non-radioactive metals.

14. The dental glaze paste according to claim 13, characterized in that The metal includes one or more of alkali metals, alkaline earth metals and second subgroup non-radioactive metals.

15. The dental glaze paste according to claim 14, characterized in that The alkali metal includes one or more of lithium, sodium and potassium; and / or, the alkaline earth metal comprises one or more of magnesium, calcium, strontium and barium; And / or, the second subgroup non-radioactive metal includes zinc.

16. The dental glaze paste according to any one of claims 1 to 15, characterized in that The components further include a colorant, which includes a fluorescent agent and / or a colorant.

17. A method for preparing the dental glaze paste according to any one of claims 1 to 16, characterized in that: The following steps are involved: A solvent, glass powder and a metal compound are mixed to obtain a dental glaze paste.

18. The preparation method according to claim 17, characterized in that: Mixing includes mixing method 1 and mixing method 2; The first mixing method includes: first mixing the metal compound and the solvent to obtain a first mixed liquid; and second mixing the first mixed liquid and the glass powder; The second mixing method includes: mixing the glass powder and the metal compound for a third time to obtain a mixed powder, and mixing the mixed powder with the solvent for a fourth time.

19. The preparation method according to claim 18, characterized in that When the components of the dental glaze paste also include a pigment, the first mixing method includes: first mixing the metal compound, the pigment and the solvent to obtain a first mixed liquid; second mixing the first mixed liquid with the glass powder; the second mixing method includes: third mixing the glass powder, the metal compound and the pigment to obtain a mixed powder, and fourth mixing the mixed powder with the solvent.

20. Use of the dental glaze paste according to any one of claims 1 to 16 or the dental glaze paste prepared by the preparation method according to any one of claims 17 to 19 in dental restorations.

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