Lithium disilicate microcrystalline dental porcelain powder and preparation method thereof

Abstract

The application provides a lithium disilicate dental porcelain powder and a preparation method thereof, and belongs to the technical field of dental restoration. The lithium disilicate microcrystalline dental porcelain powder comprises lithium disilicate glass ceramic powder and base glass powder. The chemical composition of the lithium disilicate glass ceramic powder comprises SiO2, Li2O, Al2O3, K2O, P2O5, F and TiO2. The chemical composition of the lithium disilicate glass ceramic powder comprises SiO2, Li2O, Al2O3, K2O, Na2O, F, SnO2, CaO and MgO. The thermal expansion coefficients of the lithium disilicate glass ceramic powder, the base glass powder and the lithium disilicate microcrystalline dental porcelain powder formed by the two are very matched with the thermal expansion coefficient of the base crown material. Meanwhile, the lithium disilicate glass ceramic powder has high strength, and the rod-shaped crystal interlocking structure formed by the lithium disilicate glass ceramic powder can effectively prevent the porcelain layer from cracking; the base glass powder can improve the bonding strength with the base crown and prevent the porcelain layer from falling off.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of dental restoration, in particular to a lithium disilicate microcrystalline dental porcelain powder and a preparation method thereof. BACKGROUND

[0002] In the processing of full-ceramic denture, the base crown is generally processed by using zirconia, lithium disilicate glass ceramic, aluminum hydroxide and other materials, then the dentin porcelain, enamel porcelain or incisal translucency porcelain is stacked on the surface of the base crown, and finally the outer enamel is dyed and glazed, so that a restoration body comparable to natural teeth is finally made.

[0003] At present, there are mainly two kinds of dental porcelain powders on the market for stacking dentin porcelain, enamel porcelain or incisal translucency porcelain on the surface of the base crown, one is German VITA porcelain powder, and the main crystal phase is leucite; the other is Swiss Liechtenstein Yijia porcelain powder, and the main crystal phase is fluorine mica. However, the above-mentioned dental porcelain powders have the problems of porcelain collapse after forming and easy falling off from the base crown during use. SUMMARY

[0004] In order to overcome the problems of porcelain and easy falling off of the existing dental porcelain powder, the present application provides a lithium disilicate dental porcelain powder and a preparation method thereof, the lithium disilicate glass ceramic powder, the base glass powder and the lithium disilicate microcrystalline dental porcelain powder formed by the above two have a thermal expansion coefficient of 10~11*10 -6 K -1 which is very matched with the thermal expansion coefficient of the base crown material. At the same time, the lithium disilicate glass ceramic powder has high strength, and the interlocking structure of the rod-shaped crystals formed thereby can effectively prevent the porcelain layer from cracking; the base glass powder can improve the bonding strength with the base crown and prevent the porcelain layer from falling off.

[0005] The technical scheme adopted by the present application is as follows:

[0006] A lithium disilicate microcrystalline dental porcelain powder, comprising lithium disilicate glass ceramic powder and base glass powder;

[0007] The chemical composition of the lithium disilicate glass ceramic powder includes: SiO2, 65~75wt%, Li2O, 13~15wt%, Al2O3, 2~5wt%, K2O, 3~5wt%, P2O5, 2~5%, TiO2, 1~4wt%, F, 0~2wt%, in terms of mass percentage;

[0008] The chemical composition of the base glass powder comprises, in percentage by mass: SiO2, 40-60wt%, B2O3, 10-20wt%, Li2O, 3-5wt%, Al2O3, 3-10wt%, K2O, 3-10wt%, Na2O, 3-10wt%, F, 2-5wt%, SnO2, 0-2wt%, CaO, 0-2wt%, MgO, 0-2wt%.

[0009] Further, the D50 particle size of the lithium disilicate glass ceramic powder is 3-50μm.

[0010] Further, the D50 particle size of the base glass powder is 3-50μm.

[0011] Further, the D50 particle size of the lithium disilicate glass ceramic powder is 3-50μm; the D50 particle size of the base glass powder is 3-50μm.

[0012] Further, when the lithium disilicate microcrystalline dental porcelain powder is used as dentin porcelain, the weight ratio of the lithium disilicate glass ceramic powder to the base glass powder is 65-80:35-20.

[0013] Further, when the lithium disilicate microcrystalline dental porcelain powder is used as enamel porcelain, the weight ratio of the lithium disilicate glass ceramic powder to the base glass powder is 35-65:65-35.

[0014] Further, when the lithium disilicate microcrystalline dental porcelain powder is used as incisal translucency porcelain, the weight ratio of the lithium disilicate glass ceramic powder to the base glass powder is 0-15:100-85.

[0015] Based on the same inventive concept, the application further provides a preparation method of a lithium disilicate microcrystalline dental porcelain powder, to prepare the lithium disilicate microcrystalline dental porcelain powder as described above, comprising the following steps:

[0016] Step S1, preparing a lithium disilicate glass ceramic powder;

[0017] Step S2, preparing a base glass powder;

[0018] Step S3, mixing the lithium disilicate glass ceramic powder and the base glass powder to prepare the lithium disilicate microcrystalline dental porcelain powder.

[0019] Further, the preparation process of the lithium disilicate glass ceramic powder in step S1 is as follows:

[0020] Step S11, uniformly mixing quartz sand, lithium carbonate, aluminum hydroxide, potassium carbonate, ammonium dihydrogen phosphate, potassium fluoroaluminate and titanium dioxide according to the proportion to obtain first mixed raw materials;

[0021] Step S12, high-temperature melting of the first mixed raw material to form a first glass liquid;

[0022] Step S13, water quenching of the first glass liquid by pouring into water, drying to obtain a first glass slag;

[0023] Step S14, nucleation treatment of the first glass slag at 530-550 DEG C for 60-120 min, then increasing the temperature to 800-850 DEG C for 60-120 min for crystallization treatment, grinding to obtain the lithium disilicate glass ceramic powder.

[0024] Further, the preparation process of the base glass powder in step S2 is as follows:

[0025] Step S21, uniformly mixing quartz sand, boric acid, lithium carbonate, aluminum hydroxide, potassium carbonate, sodium carbonate, sodium fluorosilicate, tin oxide, calcium carbonate and magnesium oxide according to the proportion to obtain a second mixed raw material;

[0026] Step S22, high-temperature melting of the second mixed raw material to form a second glass liquid;

[0027] Step S23, water quenching of the second glass liquid by pouring into water, drying, ball milling to obtain the base glass powder.

[0028] The beneficial effects of the present application are as follows:

[0029] The present application provides a lithium disilicate microcrystalline dental porcelain powder and a preparation method thereof, which comprises a lithium disilicate glass ceramic powder and a base glass powder. -6 K -1 The thermal expansion coefficient of the lithium disilicate glass ceramic powder, the base glass powder and the lithium disilicate microcrystalline dental porcelain powder formed by the two is 10-11*10 BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0031] Figure 1 The appearance photo of the lithium disilicate glass ceramic powder prepared in Example 1.

[0032] Figure 2 Appearance photo of the base glass powder prepared in Example 7.

[0033] Figure 3 Appearance photo of the lithium disilicate microcrystalline dental porcelain powder used as dentin porcelain prepared in Example 10.

[0034] Figure 4 Appearance photo of the lithium disilicate microcrystalline dental porcelain powder used as incisal veneer porcelain prepared in Example 16.

[0035] Figure 5 SEM detection result of the lithium disilicate glass ceramic powder prepared in Example 1.

[0036] Figure 6 XRD detection result of the lithium disilicate glass ceramic powder prepared in Example 1.

[0037] Figure 7 Comparison effect before and after the denture sintering in Example 19. DETAILED DESCRIPTION

[0038] The embodiments of the present application will be described in detail below with reference to the accompanying drawings. Example 1

[0039] A lithium disilicate glass ceramic powder, and the specific preparation process is as follows:

[0040] Step S11, the quartz sand 55.37 wt%, lithium carbonate 27.38 wt%, aluminum hydroxide 4.03 wt%, potassium carbonate 3.92 wt%, ammonium dihydrogen phosphate 5.13 wt%, potassium fluoroaluminate 1.79 wt% and titanium dioxide 2.38 wt% are mixed according to the proportion to obtain the first mixed raw material;

[0041] Step S12, the first mixed raw material is melted at a high temperature of 1550℃ to form a first glass liquid;

[0042] Step S13, the first glass liquid is poured into 30℃ cold water for water quenching, and dried at 120℃ to obtain a first glass slag;

[0043] Step S14, the first glass slag is subjected to nucleation treatment at 530℃ for 120min, and then subjected to crystallization treatment at 800℃ for 120min, and then ground for 120min-600min to obtain the lithium disilicate glass ceramic powder.

[0044] The chemical composition of the lithium disilicate glass ceramic powder includes: SiO2, 70wt%, Li2O, 14wt%, Al2O3, 4wt%, K2O, 4%, P2O5, 4%, TiO2, 3wt%, F, 1wt%.

[0045] The thermal expansion coefficient of the lithium disilicate glass ceramic powder is 10.3*10 -6 K -1 , and the D50 particle size is 3-50 μm.

[0046] The appearance of the prepared lithium disilicate glass ceramic powder is shown in the attached Figure 1 The SEM detection result of the lithium disilicate glass ceramic powder is shown in the attached Figure 5 The XRD detection result of the lithium disilicate glass ceramic powder is shown in the attached Figure 6 The XRD detection result of the lithium disilicate glass ceramic powder is shown in the attached Example 2

[0047] A lithium disilicate glass ceramic powder, and the specific preparation process is as follows:

[0048] In step S11, the quartz sand 55.37 wt%, lithium carbonate 27.38 wt%, aluminum hydroxide 4.03 wt%, potassium carbonate 3.92 wt%, ammonium dihydrogen phosphate 5.13 wt%, potassium fluoroaluminate 1.79 wt% and titanium dioxide 2.38 wt% are mixed according to the proportion to obtain a first mixed raw material;

[0049] In step S12, the first mixed raw material is melted at a high temperature of 1550°C to form a first glass liquid;

[0050] In step S13, the first glass liquid is poured into cold water at 30°C for water quenching, and dried at 120°C to obtain a first glass slag;

[0051] In step S14, the first glass slag is subjected to nucleation treatment at 550°C for 60 min, and then the temperature is increased to 850°C for 60 min for crystallization treatment, and then ground for 120-600 min to obtain a lithium disilicate glass ceramic powder.

[0052] The chemical composition of the lithium disilicate glass ceramic powder includes: SiO2, 70 wt%, Li2O, 14 wt%, Al2O3, 4 wt%, K2O, 4%, P2O5, 4% wt%, TiO2, 3 wt%, F, 1 wt%.

[0053] The thermal expansion coefficient of the lithium disilicate glass ceramic powder is 10.6*10 -6 K -1 , and the D50 particle size is 3-50 μm. Example 3

[0054] A lithium disilicate glass ceramic powder, and the specific preparation process is as follows:

[0055] Step S11, the quartz sand 55.37 wt%, lithium carbonate 27.38 wt%, aluminum hydroxide 4.03 wt%, potassium carbonate 3.92 wt%, ammonium dihydrogen phosphate 5.13 wt%, potassium fluoroaluminate 1.79 wt% and titanium dioxide 2.38 wt% are mixed uniformly according to the proportion, and a first mixed raw material is obtained;

[0056] Step S12, the first mixed raw material is melted at a high temperature of 1550℃ to form a first glass liquid;

[0057] Step S13, the first glass liquid is poured into 30℃ cold water for water quenching and dried at 120℃ to obtain a first glass slag;

[0058] Step S14, the first glass slag is subjected to nucleation treatment at 540℃ for 90min, then the temperature is increased to 825℃ for 90min for crystallization treatment, and is ground for 120min-600min to obtain a lithium disilicate glass ceramic powder.

[0059] It is detected that the chemical composition of the lithium disilicate glass ceramic powder includes: SiO2, 70 wt%, Li2O, 14 wt%, Al2O3, 4 wt%, K2O, 4%, P2O5, 4 wt%, TiO2, 3 wt%, and F, 1 wt%.

[0060] The thermal expansion coefficient of the lithium disilicate glass ceramic powder is: 10.5*10 -6 K -1 , and the D50 particle size is: 3-50μm. Example 4

[0061] A lithium disilicate glass ceramic powder, and a specific preparation process thereof is provided.

[0062] Step S11, the quartz sand 55.37 wt%, lithium carbonate 27.38 wt%, aluminum hydroxide 4.03 wt%, potassium carbonate 3.92 wt%, ammonium dihydrogen phosphate 5.13 wt%, potassium fluoroaluminate 1.79 wt% and titanium dioxide 2.38 wt% are mixed uniformly according to the proportion, and a first mixed raw material is obtained;

[0063] Step S12, the first mixed raw material is melted at a high temperature of 1550℃ to form a first glass liquid;

[0064] Step S13, the first glass liquid is poured into 30℃ cold water for water quenching and dried at 120℃ to obtain a first glass slag;

[0065] Step S14, the first glass slag is subjected to nucleation treatment at 540℃ for 90min, then the temperature is increased to 825℃ for 90min for crystallization treatment, and is ground for 120min-600min to obtain a lithium disilicate glass ceramic powder.

[0066] The chemical composition of the lithium disilicate glass ceramic powder is: SiO2, 65 wt%, Li2O, 15 wt%, Al2O3, 5 wt%, K2O, 5 wt%, P2O5, 5 wt%, TiO2, 4 wt%, F, 1 wt%.

[0067] The coefficient of thermal expansion of the lithium disilicate glass ceramic powder is: 10.3*10 -6 K -1 , and the D50 particle size is 3-50 μm. Example 5

[0068] A lithium disilicate glass ceramic powder, and the specific preparation process is:

[0069] In step S11, the quartz sand 57.56 wt%, lithium carbonate 25.70 wt%, aluminum hydroxide 5.29 wt%, potassium carbonate 4.55 wt%, ammonium dihydrogen phosphate 3.89 wt%, potassium fluoroaluminate 1.81 wt% and titanium dioxide 1.2 wt% are mixed according to the proportion to obtain the first mixed raw material;

[0070] In step S12, the first mixed raw material is melted at a high temperature of 1550°C to form a first glass liquid;

[0071] In step S13, the first glass liquid is poured into 30°C cold water for water quenching, and dried at 120°C to obtain a first glass slag;

[0072] In step S14, the first glass slag is subjected to nucleation treatment at 540°C for 90 min, and then the temperature is increased to 825°C for 90 min for crystallization treatment, and then ground for 120-600 min to obtain the lithium disilicate glass ceramic powder.

[0073] The chemical composition of the lithium disilicate glass ceramic powder is: SiO2, 72 wt%, Li2O, 13 wt%, Al2O3, 5 wt%, K2O, 4.5 wt%, P2O5, 3 wt%, TiO2, 1.5 wt%, F, 1 wt%.

[0074] The coefficient of thermal expansion of the lithium disilicate glass ceramic powder is: 10.3*10 -6 K -1 , and the D50 particle size is 3-50 μm. Example 6

[0075] A lithium disilicate glass ceramic powder, and the specific preparation process is:

[0076] Step S11, the quartz sand 60.15 wt%, lithium carbonate 28 wt%, aluminum hydroxide 2.12 wt%, potassium carbonate 2.5 wt%, ammonium dihydrogen phosphate 4.61 wt%, potassium fluoroaluminate 1.82 wt% and titanium dioxide 0.8 wt% are mixed according to the proportion, and the first mixed raw material is obtained;

[0077] Step S12, the first mixed raw material is melted at a high temperature of 1550℃ to form a first glass liquid;

[0078] Step S13, the first glass liquid is poured into 30℃ cold water for water quenching, and dried at 120℃ to obtain a first glass slag;

[0079] Step S14, the first glass slag is subjected to nucleation treatment at 540℃ for 90min, and then the temperature is increased to 825℃ for 90min for crystallization treatment, and then ground for 120-600min to obtain a lithium disilicate glass ceramic powder.

[0080] It is detected that the chemical composition of the lithium disilicate glass ceramic powder includes: SiO2, 75 wt%, Li2O, 14 wt%, Al2O3, 2.21 wt%, K2O, 3 wt%, P2O5, 3.79 wt%, TiO2, 1 wt%, F, 1 wt%.

[0081] The thermal expansion coefficient of the lithium disilicate glass ceramic powder is: 10.5*10 -6 K -1 , and the D50 particle size is 3-50μm. Example 7

[0082] A base glass powder, and the specific preparation process is as follows:

[0083] Step S21, the quartz sand 39.3 wt%, boric acid 27.01 wt%, lithium carbonate 7.56 wt%, aluminum hydroxide 7.6 wt%, potassium carbonate 6.73 wt%, sodium carbonate 5.66 wt%, sodium fluosilicate 4.7 wt%, tin oxide 0.38 wt%, calcium carbonate 0.68 wt% and magnesium oxide 0.38 wt% are mixed according to the proportion to obtain a second mixed raw material;

[0084] Step S22, the second mixed raw material is melted at a high temperature of 1400℃ to form a second glass liquid;

[0085] Step S23, the second glass liquid is poured into 30℃ cold water for water quenching, and dried at 120℃, and then ball milled for 120-600min to obtain a base glass powder.

[0086] The chemical composition of the base glass powder, as determined by testing, includes: SiO2, 53 wt%, B2O3, 20 wt%, Li2O, 4 wt%, Al2O3, 6.5 wt%, K2O, 6 wt%, Na2O, 6 wt%, F, 3 wt%, SnO2, 0.5 wt%, CaO, 0.5 wt%, and MgO, 0.5 wt%.

[0087] The coefficient of thermal expansion of the basic glass powder is: 10.1*10 -6 K -1 D50 particle size: 3~50μm.

[0088] Appendix Figure 2 The image shows the appearance of the prepared base glass powder, which is a white powder. Example 8

[0089] A basic glass powder, the specific preparation process of which is as follows:

[0090] Step S21: Mix 28.09 wt% quartz sand, 25.88 wt% boric acid, 9.05 wt% lithium carbonate, 7.28 wt% aluminum hydroxide, 10.74 wt% potassium carbonate, 9.04 wt% sodium carbonate, 7.5 wt% sodium fluorosilicate, 0.36 wt% tin oxide, 1.33 wt% calcium carbonate and 0.73 wt% magnesium oxide evenly according to the formula to obtain the second mixed raw material;

[0091] Step S22: The second mixed raw material is melted at a high temperature of 1400°C to form a second glass melt;

[0092] Step S23: Pour the second glass melt into 30°C cold water for water quenching, dry at 120°C, and ball mill for 120-600 min to obtain basic glass powder.

[0093] According to the test, the chemical composition of the basic glass powder includes: SiO2, 41wt%, B2O3, 20wt%, Li2O, 5wt%, Al2O3, 6.5wt%, K2O, 10wt%, Na2O, 10wt%, F, 5wt%, SnO2, 0.5wt%, CaO, 1wt%, MgO, 1wt%.

[0094] The coefficient of thermal expansion of the basic glass powder is: 10.8*10. -6 K -1 D50 particle size: 3~50μm. Example 9

[0095] A basic glass powder, the specific preparation process of which is as follows:

[0096] Step S21, the quartz sand 46.18wt%, boric acid 14.23wt%, lithium carbonate 9.95wt%, aluminum hydroxide 8wt%, potassium carbonate 3.54wt%, sodium carbonate 7.21wt%, sodium fluorosilicate 8.25wt%, tin oxide 0.4wt%, calcium carbonate 1.44wt% and magnesium oxide 0.8wt% are mixed according to the proportion, and the second mixed raw material is obtained;

[0097] Step S22, the second mixed raw material is melted at 1400℃ high temperature to form a second glass liquid;

[0098] Step S23, the second glass liquid is poured into 30℃ cold water for water quenching, dried at 120℃, and ball milled for 120-600min to obtain a base glass powder.

[0099] The chemical composition of the base glass powder includes: SiO2, 60wt%, B2O3, 10wt%, Li2O, 5wt%, Al2O3, 6.5wt%, K2O, 3wt%, Na2O, 8wt%, F, 5wt%, SnO2, 0.5wt%, CaO, 1wt%, MgO, 1wt%.

[0100] The thermal expansion coefficient of the base glass powder is: 10.6*10 -6 K -1 , and the D50 particle size is 3-50μm.

[0101] In examples 1-6, the lithium disilicate glass ceramic powder with a D50 particle size of 3-50μm can be obtained by controlling the ball milling time. Similarly, in examples 7-9, the base glass powder with a D50 particle size of 3-50μm can be obtained by controlling the ball milling time.

[0102] Since the particle sizes of dentin porcelain, enamel porcelain and incisal edge transparent porcelain are different, in practice, the corresponding D50 particle size of lithium disilicate glass ceramic powder and base glass powder can be selected for compounding to obtain the corresponding particle size of dentin porcelain, enamel porcelain or incisal edge transparent porcelain. Example 10

[0103] A lithium disilicate microcrystalline dental porcelain powder is used as dentin porcelain, which is obtained by mixing the lithium disilicate glass ceramic powder in example 1 and the base glass powder in example 7 according to a mass ratio of 65:35.

[0104] The lithium disilicate microcrystalline dental porcelain powder has a thermal expansion coefficient of: 10.23*10 -6 K -1 , and a D50 particle size of 40μm.

[0105] The lithium disilicate microcrystalline dental porcelain powder is prepared into a porcelain bonding sample according to the standard ISO 9693-2:2016 for testing, and the porcelain bonding strength of the dental porcelain is 35 MPa.

[0106] The lithium disilicate microcrystalline dental porcelain powder is prepared into a porcelain bonding sample according to the standard ISO 9693-2:2016 for testing, and the porcelain bonding strength of the dental porcelain is 35 MPa. Figure 3 The lithium disilicate microcrystalline dental porcelain powder is prepared into a porcelain bonding sample according to the standard ISO 9693-2:2016 for testing, and the porcelain bonding strength of the dental porcelain is 35 MPa. Example 11

[0107] The lithium disilicate microcrystalline dental porcelain powder is prepared into a porcelain bonding sample according to the standard ISO 9693-2:2016 for testing, and the porcelain bonding strength of the dental porcelain is 35 MPa.

[0108] The lithium disilicate microcrystalline dental porcelain powder is prepared into a porcelain bonding sample according to the standard ISO 9693-2:2016 for testing, and the porcelain bonding strength of the dental porcelain is 35 MPa. -6 K -1 , and the D50 particle size is 40 μm.

[0109] The lithium disilicate microcrystalline dental porcelain powder is prepared into a porcelain bonding sample according to the standard ISO 9693-2:2016 for testing, and the porcelain bonding strength of the dental porcelain is 35 MPa. Example 12

[0110] The lithium disilicate microcrystalline dental porcelain powder is prepared into a porcelain bonding sample according to the standard ISO 9693-2:2016 for testing, and the porcelain bonding strength of the dental porcelain is 35 MPa.

[0111] The lithium disilicate microcrystalline dental porcelain powder is prepared into a porcelain bonding sample according to the standard ISO 9693-2:2016 for testing, and the porcelain bonding strength of the dental porcelain is 35 MPa. -6 K -1 , and the D50 particle size is 40 μm.

[0112] The lithium disilicate microcrystalline dental porcelain powder is prepared into a porcelain bonding sample according to the standard ISO 9693-2:2016 for testing, and the porcelain bonding strength of the dental porcelain is 35 MPa. Example 13

[0113] The lithium disilicate microcrystalline dental porcelain powder is prepared into a porcelain bonding sample according to the standard ISO 9693-2:2016 for testing, and the porcelain bonding strength of the dental porcelain is 35 MPa.

[0114] The lithium disilicate microcrystalline dental porcelain powder is prepared into a porcelain bonding sample according to the standard ISO 9693-2:2016 for testing, and the porcelain bonding strength of the dental porcelain is 35 MPa. -6 K -1 , and the D50 particle size is 40 μm.

[0115] The lithium disilicate microcrystalline dental porcelain powder is prepared into a porcelain bonding sample according to the standard ISO 9693-2:2016 for testing, and the porcelain bonding strength of the dental porcelain is 35 MPa. Example 14

[0116] A lithium disilicate microcrystalline dental porcelain powder, used as dental enamel porcelain, is prepared by mixing lithium disilicate glass ceramic powder from Example 5 and basic glass powder from Example 8 in a mass ratio of 50:50.

[0117] The coefficient of thermal expansion of lithium disilicate microcrystalline dental porcelain powder, as tested, is 10.55 × 10⁻⁶. -6 K -1 D50 particle size: 35μm.

[0118] Lithium disilicate microcrystalline dental porcelain powder was used to prepare porcelain-bonded samples according to ISO 9693-2:2016 standard, and the porcelain-bonded strength of the dental ceramic was measured to be 36 MPa. Example 15

[0119] A lithium disilicate microcrystalline dental porcelain powder, used as dental enamel porcelain, is prepared by mixing lithium disilicate glass ceramic powder from Example 6 and basic glass powder from Example 9 in a mass ratio of 65:35.

[0120] The coefficient of thermal expansion of lithium disilicate microcrystalline dental porcelain powder is measured to be 10.43 × 10⁻⁶. -6 K -1 D50 particle size: 35μm.

[0121] Lithium disilicate microcrystalline dental porcelain powder was used to prepare porcelain-bonded samples according to ISO 9693-2:2016 standard, and the porcelain-bonded strength of the dental ceramic was measured to be 35 MPa. Example 16

[0122] A lithium disilicate microcrystalline dental porcelain powder, used as incisional transparent porcelain, is prepared by mixing lithium disilicate glass ceramic powder from Example 1 and base glass powder from Example 7 in a mass ratio of 15:85.

[0123] The coefficient of thermal expansion of lithium disilicate microcrystalline dental porcelain powder is measured to be 10.13 × 10⁻⁶. -6 K -1 D50 particle size: 30μm.

[0124] Lithium disilicate microcrystalline dental porcelain powder was used to prepare porcelain-bonded samples according to ISO 9693-2:2016 standard, and the porcelain-bonded strength of the dental ceramic was measured to be 38 MPa.

[0125] Appendix Figure 4 The image shows the appearance of lithium disilicate microcrystalline dental porcelain powder used as incisional transparent porcelain, which is a white powder. Example 17

[0126] A lithium disilicate microcrystalline dental porcelain powder for use as a veneering porcelain, which is prepared by mixing the lithium disilicate glass-ceramic powder of Example 1 and the base glass powder of Example 7 in a mass ratio of 8:92.

[0127] The lithium disilicate microcrystalline dental porcelain powder has a thermal expansion coefficient of 10.12*10 -6 K -1 and a D50 particle size of 20 μm.

[0128] The lithium disilicate microcrystalline dental porcelain powder is prepared into a porcelain bonding sample according to the ISO 9693-2:2016 standard, and the dental porcelain is detected to have a porcelain bonding strength of 40 MPa. Example 18

[0129] A lithium disilicate microcrystalline dental porcelain powder for use as a veneering porcelain, which is prepared by mixing the lithium disilicate glass-ceramic powder of Example 1 and the base glass powder of Example 7 in a mass ratio of 0:100.

[0130] The lithium disilicate microcrystalline dental porcelain powder has a thermal expansion coefficient of 10.1*10 -6 K -1 and a D50 particle size of 6 μm.

[0131] The lithium disilicate microcrystalline dental porcelain powder is prepared into a porcelain bonding sample according to the ISO 9693-2:2016 standard, and the dental porcelain is detected to have a porcelain bonding strength of 42 MPa. Example 19

[0132] The dentin porcelain of Example 10, the enamel porcelain of Example 13 and the veneering porcelain of Example 16 are sequentially stacked from inside to outside on the base crown, and a denture is obtained after sintering, as shown in FIG. 6. Figure 7 The first one from left to right in the figure is the effect before sintering, and the other two are the effects after sintering. As can be seen from the figure, the surface of the denture before sintering is relatively rough, while the sintered denture as a whole is slightly yellow, and the outer layer is translucent, which is comparable to natural teeth.

Claims

1. A lithium disilicate microcrystalline dental porcelain powder, characterized in that, The lithium disilicate glass ceramic powder and the base glass powder are mixed to obtain the lithium disilicate microcrystalline dental porcelain powder. The chemical composition of the lithium disilicate glass ceramic powder includes, in percentage by mass, SiO2 65-75 wt%, Li2O 13-15 wt%, Al2O3 2-5 wt%, K2O 3-5 wt%, P2O5 2-5%, TiO2 1-4 wt%, and F 0-2 wt%. The chemical composition of the base glass powder includes, in percentage by mass, SiO2 40-60 wt%, B2O3 10-20 wt%, Li2O 3-5 wt%, Al2O3 3-10 wt%, K2O 3-10 wt%, Na2O 3-10 wt%, F 2-5 wt%, SnO2 0-2 wt%, CaO 0-2 wt%, and MgO 0-2 wt%.

2. The lithium disilicate microcrystalline dental ceramic powder according to claim 1, characterized in that, The D50 particle size of the lithium disilicate glass ceramic powder is 3-50 μm.

3. The lithium disilicate microcrystalline dental ceramic powder according to claim 1, characterized in that, The D50 particle size of the base glass powder is 3-50 μm.

4. The lithium disilicate microcrystalline dental ceramic powder according to claim 1, characterized in that, The D50 particle size of the lithium disilicate glass ceramic powder is 3-50 μm; and the D50 particle size of the base glass powder is 3-50 μm.

5. The lithium disilicate microcrystalline dental porcelain powder according to any one of claims 1-4, characterized in that when the lithium disilicate microcrystalline dental porcelain powder is used as dentin porcelain, the weight ratio of the lithium disilicate glass ceramic powder to the base glass powder is 65-80:35-20.

6. The lithium disilicate microcrystalline dental porcelain powder according to any one of claims 1-4, characterized in that when the lithium disilicate microcrystalline dental porcelain powder is used as enamel porcelain, the weight ratio of the lithium disilicate glass ceramic powder to the base glass powder is 35-65:65-35.

7. The lithium disilicate microcrystalline dental porcelain powder according to any one of claims 1-4, characterized in that when the lithium disilicate microcrystalline dental porcelain powder is used as incisal translucency porcelain, the weight ratio of the lithium disilicate glass ceramic powder to the base glass powder is 8-15:92-85.

8. A method for producing a lithium disilicate microcrystalline dental porcelain powder, for producing a lithium disilicate microcrystalline dental porcelain powder according to any one of claims 1 to 7, characterized in that The method comprises the following steps: Step S1, preparing a lithium disilicate glass ceramic powder; Step S2, preparing a base glass powder; Step S3, mixing the lithium disilicate glass ceramic powder and the base glass powder to obtain the lithium disilicate microcrystalline dental porcelain powder.

9. The method for preparing lithium disilicate microcrystalline dental porcelain powder according to claim 8, characterized in that, The preparation process of the lithium disilicate glass ceramic powder in step S1 is as follows: Step S11, uniformly mixing quartz sand, lithium carbonate, aluminum hydroxide, potassium carbonate, ammonium dihydrogen phosphate, potassium fluoroaluminate, and titanium dioxide according to the proportions to obtain first mixed raw materials; Step S12, high-temperature melting of the first mixed raw materials to form a first glass liquid; Step S13, water quenching of the first glass liquid by pouring into water, drying to obtain first glass slag; Step S14, nucleation treatment of the first glass slag at 530-550 ℃ for 60-120 min, then increasing the temperature to 800-850 ℃ for 60-120 min for crystallization treatment, and grinding to obtain the lithium disilicate glass ceramic powder.

10. The method for preparing lithium disilicate microcrystalline dental porcelain powder according to claim 8, characterized in that, The preparation process of the base glass powder in step S2 is as follows: Step S21, the quartz sand, boric acid, lithium carbonate, aluminum hydroxide, potassium carbonate, sodium carbonate, sodium fluorosilicate, tin oxide, calcium carbonate and magnesium oxide are mixed in proportion to obtain a second mixed raw material; Step S22, the second mixed raw material is high-temperature melted to form a second glass liquid; Step S23, the second glass liquid is poured into water for water quenching, drying, ball milling to obtain the base glass powder.

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