Tetracycline tooth all-ceramic shade guide and preparation method thereof

Abstract

The invention provides a tetracycline tooth all-ceramic shade guide and a preparation method thereof, and relates to the technical field of tetracycline tooth ceramic repair. By using the opaque porcelain powder and a specific sintering process, a good opaque effect is ensured, and internal color spots of tetracycline teeth can be effectively covered. The specific dyeing porcelain powder coating thickness and the porcelain baking process are combined, the glossiness of the shade guide is improved, and the accuracy of color matching and the attractiveness of the restoration are ensured. Through a standardized preparation process, the quality and consistency of the colorimetric plate are ensured, the colorimetric plate shows high doctor and patient satisfaction in clinical application, the color matching degree is higher, the repairing effect is closer to that of natural teeth, and the actual requirements of patients can be better met.

Description

Technical Field

[0001] The invention relates to the technical field of tetracycline tooth porcelain restoration, in particular to a tetracycline tooth all-ceramic colorimetric plate and a preparation method thereof. Background Art

[0002] Tetracycline teeth refer to tooth discoloration and enamel hypoplasia caused by taking tetracycline drugs during tooth development. This situation usually occurs during the mineralization period of tooth development. Tetracycline drugs will combine with tooth tissue to form tetracycline orthophosphate complexes, which will stain the teeth. Clinical manifestations include changes in tooth color (yellow at first, gradually turning into brown or dark gray), enamel hypoplasia, and more obvious coloration of front teeth than back teeth.

[0003] At present, the treatment methods for tetracycline teeth mainly include cold light whitening and porcelain restoration. Cold light whitening is suitable for mild and partially moderate tetracycline teeth. It removes the pigmentation on the surface of the teeth through the action of low-temperature cold light and hydrophilic whitening agent, and penetrates deep into the teeth to achieve the decolorization effect. The advantages of cold light whitening are simple operation, painless and no damage to teeth and gums. However, for severe tetracycline teeth, the effect of cold light whitening may not be ideal. Porcelain restorations include porcelain veneers and all-ceramic crowns, which are suitable for moderate to severe tetracycline teeth. Porcelain veneers are suitable for mild to moderate tetracycline teeth. Porcelain veneers are a kind of porcelain restoration covering part of the tooth surface. Through bonding technology, it can repair tooth surface defects, stained teeth, discolored teeth and deformed teeth while preserving vital pulp and less molars. Porcelain veneers have the advantages of beautiful and natural appearance, good wear resistance and high tissue compatibility. All-ceramic crowns are suitable for severe tetracycline teeth, or accompanied by tooth proximal caries, tooth gaps and other conditions. All-ceramic crowns contain no metal and can simulate the transparency, color and appearance of teeth.

[0004] During the porcelain or all-ceramic restoration process of tetracycline teeth, a shade guide for normal tooth restoration is usually used for subjective color comparison by naked eye. The technician will select the color scale in the shade guide that is closest to the patient's tooth color, and process the porcelain restoration according to the color scale. However, due to the difference in color characteristics between tetracycline teeth and normal teeth, when comparing colors for patients with tetracycline teeth, it is impossible to accurately and quickly select the closest and most suitable denture color for the patient. Only a roughly similar color system can be selected first, and then external dyeing with multiple dyes is required to compensate for the color difference. This problem poses a challenge to clinical work.

[0005] The invention patent with publication number CN 106510882 A discloses a colorimetric plate for tetracycline tooth porcelain restoration. By establishing the chromaticity value L of tetracycline tooth patients * a * b * Database, for L * a * b *Systematic cluster analysis was performed to determine the chromaticity value of the color scale of the color comparison plate. Combining the representativeness of the color scale and the convenience of clinical use, 12 color scales were designed. * The values ​​are arranged from high to low, and the color scale is arranged regularly; because the chromaticity value of the color scale is specially designed through the analysis of the color of tetracycline teeth, the color difference with the corresponding tetracycline teeth is smaller. This color comparison plate can help doctors and physicians match colors more accurately in tetracycline tooth porcelain or all-ceramic restorations, and provide tetracycline tooth patients with porcelain restorations with more matching colors.

[0006] The invention patent with publication number CN 106175965 A discloses a colorimetric plate that can accurately compare the color of discolored teeth undergoing tooth bleaching treatment and scientifically interpret the bleaching effect. * a * b * Database, statistical analysis of the chromaticity values ​​of tetracycline teeth, fluorosis teeth, and yellow teeth, a * and b * Take the average value, L * Systematic cluster analysis was performed to determine the chromaticity values ​​of the color scales of the color comparison plate. In consideration of the convenience of clinical use, 7 color scales were designed for each color-changing tooth color comparison plate, for a total of 3 color comparison plates. The chromaticity values ​​of the 7 color scales of the tetracycline tooth color comparison plate are: a * :4.8;b * : 13.0; L * They are: 80.9, 77.6, 75.5, 71.4, 68.4, 52.2, 49.7. The chromaticity values ​​of the 7 color scales of the fluorosis color chart are: a * :3.8;b * :14.5;L * They are: 88.9, 84.8, 81.8, 78.6, 75.7, 70.5, 64.5. The chromaticity values ​​of the 7 color scales of the yellow tooth color comparison chart are: a * :3.0;b * :13.8;L * They are: 77.9, 76.5, 74.5, 72.5, 70.8, 68.2, and 66.7 respectively.

[0007] It can be seen that the existing tetracycline tooth all-ceramic colorimetric plates all determine the color scale of the colorimetric plates by chromaticity values, and improve the color matching accuracy by reducing color difference. However, the above invention patents do not disclose the preparation process of the colorimetric plates, and ignore the effect of the glossiness of the colorimetric plates on the color matching accuracy. But in practice, it can be found that the glossiness of the tetracycline tooth all-ceramic colorimetric plates has a significant effect on the color matching effect. Colorimetric plates with high gloss can better reflect light and make the colors look more real, thereby more accurately simulating the optical properties of natural teeth and helping doctors to match the color of the restoration more accurately. However, colorimetric plates with low glossiness are dim and uneven in color, which seriously affects the color matching of the restoration. Therefore, ensuring the glossiness of the colorimetric plate is of great significance to improving the effect of tetracycline tooth all-ceramic restoration and ensuring that the color of the restoration is natural and beautiful.

[0008] Therefore, it is necessary to make a shade guide with good gloss specifically for tetracycline teeth in order to more accurately match the color of the restoration and improve the restoration effect and patient satisfaction. Summary of the invention

[0009] To solve the above problems, the present invention provides a tetracycline tooth all-ceramic colorimetric plate and a preparation method thereof. The method obtains a colorimetric plate with good gloss through a specific preparation process combined with precise control of raw material composition, ratio and key process parameters, thereby improving the matching accuracy of the color of the colorimetric plate to the color of the restoration, and improving the porcelain restoration effect of tetracycline teeth and patient satisfaction.

[0010] The preparation method of the tetracycline tooth all-ceramic colorimetric plate is as follows:

[0011] First, determine the base color of the color plate, then evenly apply the opaque porcelain powder on the inner crown for full-ceramic color masking and then sinter to form opaque porcelain. After sintering, evenly apply the dyeing porcelain powder on the opaque porcelain, and then perform porcelain baking. After porcelain baking, a tetracycline tooth full-ceramic color comparison plate is obtained.

[0012] Furthermore, the method for determining the base color is as follows: a number of patients with tetracycline teeth are selected clinically for color comparison, and finally a representative base color is selected.

[0013] Further, the inner crown is a zirconia inner crown. Preferably, the inner crown is a zirconia inner crown of a reddish brown color system in the VITA Classical color system. More preferably, the inner crown is a zirconia inner crown of an A3 porcelain block of a reddish brown color system in the VITA Classical color system.

[0014] Furthermore, the opaque porcelain powder is opaque porcelain powder ZL3, and the coating thickness of the opaque porcelain powder is 0.5 mm. Preferably, the opaque porcelain powder is dripped into the glaze liquid before coating and mixed evenly before coating.

[0015] Furthermore, the sintering temperature is 960° C. and the sintering time is 20 min.

[0016] Furthermore, the preparation method of the dyed porcelain powder is as follows: adding the porcelain base to the dyed powder to obtain a mixed powder, mixing the powder evenly with distilled water, and removing excess water to obtain the mixed powder.

[0017] Furthermore, the dyed porcelain powder is brown, orange, dark yellow or white spot color.

[0018] Furthermore, the base porcelain in the dyed porcelain powder is A3 color porcelain powder, and the A3 color is A3 of the reddish brown series in the VITA Classical color scale system.

[0019] Furthermore, the brown-based dyed porcelain powder comprises the following raw materials: 0.8 to 1.0 parts by mass of a porcelain base, 0.015 to 0.025 parts by mass of a brown dyeing powder, and 0.003 to 0.005 parts by mass of a black dyeing powder; the orange-based dyed porcelain powder comprises the following raw materials: 0.8 to 1.0 parts by mass of a porcelain base, 0.03 to 0.05 parts by mass of an orange dyeing powder, and 0.005 to 0.008 parts by mass of a black dyeing powder; the dark yellow-based dyed porcelain powder comprises the following raw materials: 0.8 to 1.0 parts by mass of a porcelain base, 0.08 to 1.0 parts by mass of a yellow dyeing powder, and 0.008 to 0.01 parts by mass of a brown dyeing powder; the white spot-based dyed porcelain powder comprises the following raw materials: 0.8 to 1.0 parts by mass of a porcelain base, 0.4 to 0.6 parts by mass of a white dyeing powder, and 0.008 to 0.01 parts by mass of a brown dyeing powder.

[0020] Furthermore, the coating thickness of the dyed porcelain powder is 1.0 to 1.3 mm.

[0021] Furthermore, the porcelain firing temperature is 740° C. to 760° C., and the porcelain firing time is 780 to 800 seconds. Preferably, the porcelain firing temperature is 750° C., and the porcelain firing time is 790 seconds.

[0022] The present invention also provides a tetracycline tooth all-ceramic colorimetric plate prepared according to the method.

[0023] Compared with the prior art, the beneficial technical effects of the present invention are:

[0024] The present invention clinically selects tetracycline teeth patients for color comparison to determine a representative base color, so that the color comparison plate can more accurately reflect the color characteristics of tetracycline teeth.

[0025] The present invention uses color-shielding porcelain powder and a specific sintering process to ensure a good color-shielding effect and can effectively cover the intrinsic color spots of tetracycline teeth.

[0026] The present invention provides a variety of dyed porcelain powders, which can be customized according to the needs of different patients. Combined with the specific dyed porcelain powder coating thickness and porcelain baking process, the glossiness of the colorimetric plate is improved, ensuring the accuracy of color matching and the aesthetics of the restoration.

[0027] The present invention ensures the quality and consistency of the colorimetric plate through a standardized preparation process, shows high physician and patient satisfaction in clinical applications, has a higher color matching degree, and the restoration effect is closer to natural teeth, which can better meet the actual needs of patients. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be further described below in conjunction with the accompanying drawings.

[0029] Figure 1 The zirconia inner crown of the A3 ceramic block of the present invention;

[0030] Figure 2 The zirconia inner crown is an A3 porcelain block coated with opaque porcelain powder and sintered according to the present invention;

[0031] Figure 3 The tetracycline tooth all-ceramic colorimetric plate of Example 1 of the present invention;

[0032] Figure 4 The tetracycline tooth all-ceramic colorimetric plate of Example 2 of the present invention;

[0033] Figure 5 The tetracycline tooth all-ceramic colorimetric plate of Example 3 of the present invention;

[0034] Figure 6 This is the tetracycline tooth all-ceramic colorimetric plate of Example 4 of the present invention. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with embodiments. Unless otherwise defined, all professional terms used hereinafter have the same meaning as those skilled in the art generally understand. The professional terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present invention.

[0036] The present invention provides a method for preparing a tetracycline tooth all-ceramic colorimetric plate, and the specific steps are as follows:

[0037] First, determine the base color of the color plate, then evenly apply the opaque porcelain powder on the inner crown for full-ceramic color masking and then sinter to form opaque porcelain. After sintering, evenly apply the dyeing porcelain powder on the opaque porcelain, and then perform porcelain baking. After porcelain baking, a tetracycline tooth full-ceramic color comparison plate is obtained.

[0038] In one embodiment, the method for determining the base color is as follows: a number of patients with tetracycline teeth are selected clinically for color comparison, and finally a representative base color is selected.

[0039] In clinical practice, several patients with tetracycline teeth are selected for color comparison, and the purpose of finally selecting a representative base color is to ensure that the colorimetric plate can accurately reflect the common color changes of tetracycline teeth. This method helps to improve the applicability and accuracy of the colorimetric plate, so that it can better match the tooth colors of different patients in practical applications. The present invention does not limit the age, gender and specific number of patients. The reason is that the color changes of tetracycline teeth are affected by many factors, including the age of the patient, the degree of tooth wear, the use time and dosage of tetracycline, etc. By not limiting the specific characteristics of the patient, a wider range of color changes can be covered to ensure the representativeness of the colorimetric plate. Therefore, in actual operation, the specific number of patients is usually determined according to the actual situation and research needs, but usually a sample size of 30-50 cases can provide more reliable data. Subsequent research of the present invention has shown that the four-color colorimetric plate obtained by using zirconia inner crowns made of A3 porcelain blocks, using ZL3 as opaque porcelain powder, and using brown, orange, dark yellow or white spot color-dyed porcelain powders can be suitable for most patients. However, this does not mean that the present invention can only use the above-mentioned combinations of inner crowns, opaque porcelain powders and dyeing porcelain powders. In fact, common raw materials on the market can be used in the technical solution of the present invention.

[0040] In one embodiment, the inner crown is a zirconia inner crown.

[0041] In one embodiment, the inner crown is a reddish brown zirconia inner crown in the VITA Classical color system.

[0042] In one embodiment, the inner crown is a zirconia inner crown of an A3 ceramic block in the reddish brown color system of the VITA Classical color system.

[0043] The A3 color number is a reddish-brown color in the VITA Classical color scale system, which is commonly found in the color range of natural teeth and can better simulate and match the color of tetracycline teeth. Zirconia material has good light transmittance and color-shielding effect, and can cover the color defects of tetracycline teeth while maintaining natural beauty. Zirconia material has high strength and durability, is suitable as an inner crown material, and can provide stable structural support. Therefore, the present invention preferably uses a zirconia inner crown of an A3 porcelain block as a colorimetric plate inner crown, so that the colorimetric plate can meet the requirements of color contrast accuracy in clinical practice.

[0044] In one embodiment, the opaque porcelain powder is opaque porcelain powder ZL3.

[0045] In one embodiment, the sintering temperature is 960° C. and the sintering time is 20 min.

[0046] The present invention limits the sintering parameters of the opaque porcelain powder to ensure that the opaque porcelain powder can be fully melted and form a good bond with the base material during the sintering process, while avoiding deformation or color change of the material due to excessively high temperature or excessively long time. In addition, appropriate sintering temperature and time can ensure that the surface of the opaque porcelain powder forms a uniform and smooth glaze surface, avoid pores or cracks on the porcelain powder surface, improve the uniformity and bonding strength of the subsequent dyeing porcelain powder layer, and avoid color difference and gloss damage caused by the base color.

[0047] In one embodiment, the preparation method of the dyed porcelain powder is as follows: adding the porcelain base to the dyeing powder to obtain a mixed powder, mixing the powder evenly with distilled water, and removing excess water to obtain the mixed powder.

[0048] In one embodiment, the dyed ceramic powder is brown, orange, dark yellow or white spot color.

[0049] In one embodiment, the base porcelain in the dyed porcelain powder is A3 color porcelain powder.

[0050] In one embodiment, the brown-based dyeing porcelain powder comprises the following raw materials: 0.8 to 1.0 parts by mass of a porcelain base, 0.015 to 0.025 parts by mass of a brown dyeing powder, and 0.003 to 0.005 parts by mass of a black dyeing powder; the orange-based dyeing porcelain powder comprises the following raw materials: 0.8 to 1.0 parts by mass of a porcelain base, 0.03 to 0.05 parts by mass of an orange dyeing powder, and 0.005 to 0.008 parts by mass of a black dyeing powder; the dark yellow-based dyeing porcelain powder comprises the following raw materials: 0.8 to 1.0 parts by mass of a porcelain base, 0.08 to 1.0 parts by mass of a yellow dyeing powder, and 0.008 to 0.01 parts by mass of a brown dyeing powder; the white spot-based dyeing porcelain powder comprises the following raw materials: 0.8 to 1.0 parts by mass of a porcelain base, 0.4 to 0.6 parts by mass of a white dyeing powder, and 0.008 to 0.01 parts by mass of a brown dyeing powder.

[0051] The present invention does not strictly limit the type of color powder, and commercially available conventional color powder for dentures can be used in the technical solution of the present invention.

[0052] In one embodiment, the coating thickness of the dyed ceramic powder is 1.0-1.3 mm.

[0053] In one embodiment, the porcelain baking temperature is 740° C. to 760° C., and the porcelain baking time is 780 to 800 seconds.

[0054] In one embodiment, the porcelain firing temperature is 750° C., and the porcelain firing time is 780 to 800 seconds.

[0055] The present invention strictly limits the coating thickness of the dyed porcelain powder and the porcelain baking temperature.

[0056] First, when the thickness of the dyed porcelain powder is less than 1.0 mm, the base color of the crown in the colorimetric plate is revealed after sintering, and the color distribution is uneven, the color saturation and glossiness of the colorimetric plate are low, and accurate colorimetry cannot be achieved; when the thickness of the porcelain powder is greater than 1.5 mm, the edges of the cut ends of the porcelain layer do not fit together after sintering, the glossiness is significantly deteriorated, and it is easy to separate from the opaque porcelain layer, and accurate colorimetry cannot be achieved. Therefore, the present invention strictly limits the coating thickness of the dyed porcelain powder to ensure the colorimetric accuracy and the yield rate of the color plate, improve the durability of the colorimetric plate, and reduce the generation of defective products.

[0057] Secondly, the present invention strictly limits the porcelain baking temperature of the dyed porcelain powder. The appropriate porcelain baking temperature can ensure that the color of the dyed porcelain powder is stable during the sintering process and will not change color or fade. In addition, actual studies have shown that the porcelain baking process parameters of the present invention have a very important influence on the glossiness of the color comparison plate. When the thickness of the porcelain powder at the neck and the cutting end of the tooth is consistent, a porcelain baking temperature of 740°C to 760°C can obtain a color comparison plate with the best gloss. When the porcelain baking temperature is less than 740°C, the glossiness is poor and accurate color comparison cannot be achieved. When the porcelain baking temperature is greater than 760°C, the dyed porcelain powder layer is deformed, the surface is uneven, the glossiness is impaired, and there are common phenomena such as reduced bonding strength with the base material and stratification and shedding.

[0058] The technical solutions in the implementation cases of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, other embodiments obtained by ordinary technicians in this field without creative work are all within the scope of invention protection. In the following embodiments, all raw materials are commercially available.

[0059] The raw materials used in the specific implementation of the present invention are as follows:

[0060] The brown dyeing powder is brown dyeing powder No. E11, the black dyeing powder is black dyeing powder No. E19, the orange dyeing powder is orange dyeing powder No. E05, the yellow dyeing powder is yellow dyeing powder No. E08, the brown dyeing powder is brown dyeing powder No. E11, the white dyeing powder is white dyeing powder No. E01, and the brown dyeing powder is brown dyeing powder No. E11. The above dyeing powders are all purchased from Ivoclar Vivadent; the zirconia inner crown of A3 porcelain block is purchased from Ivoclar Vivadent; the A3 color porcelain powder is purchased from Ivoclar Vivadent; the opaque porcelain powder ZL3 is purchased from Ivoclar Vivadent; the zirconia inner crown is made of Wieland brand porcelain block after cutting and polishing.

[0061] In a specific embodiment of the present invention, the base color selection method is as follows: 40 patients with moderate to severe tetracycline teeth were selected clinically, the patients were aged 40 to 60 years old, and the gender was male, and color comparison was performed to finally select the most common base color among the four types of tetracycline teeth patients.

[0062] Example 1 A method for preparing a brown tetracycline tooth all-ceramic colorimetric plate, the steps are as follows:

[0063] ZL3 opaque porcelain powder with a thickness of 0.5 mm was evenly coated on the zirconia inner crown of the A3 porcelain block, and sintered at 960°C for 20 minutes to complete the full-ceramic opaque coloring. The dyed porcelain powder was evenly coated on the opaque porcelain, and then the porcelain was baked at 750°C for 790 seconds. After the baking was completed, a brown tetracycline tooth full-ceramic color guide was obtained.

[0064] The raw material composition of the dyeing porcelain powder is as follows: 1.0 g of porcelain base, 0.3 g of brown dyeing powder, and 0.008 g of black dyeing powder.

[0065] Example 2 A method for preparing an orange tetracycline tooth all-ceramic colorimetric plate, the steps are as follows:

[0066] ZL3 opaque porcelain powder with a thickness of 0.5 mm was evenly coated on the zirconia inner crown of the A3 porcelain block, and sintered at 960°C for 20 minutes to complete the full-ceramic opaque coloring. The dyed porcelain powder was evenly coated on the opaque porcelain, and then the porcelain was baked at 750°C for 790 seconds. After the baking was completed, an orange tetracycline tooth full-ceramic color guide was obtained.

[0067] The raw material composition of the dyeing porcelain powder is as follows: 1.0 g of porcelain base, 0.8 g of orange dyeing powder, and 0.008 g of black dyeing powder.

[0068] Example 3 A method for preparing a dark yellow tetracycline tooth all-ceramic colorimetric plate, the steps are as follows:

[0069] ZL3 opaque porcelain powder with a thickness of 0.5 mm was evenly coated on the zirconia inner crown of the A3 porcelain block, and sintered at 960°C for 20 minutes to complete the full-ceramic opaque coloring. The dyed porcelain powder was evenly coated on the opaque porcelain, and then the porcelain was baked at 750°C for 790 seconds. After the baking was completed, a deep yellow tetracycline tooth full-ceramic color guide plate was obtained.

[0070] The raw material composition of the dyeing porcelain powder is as follows: 1.0g of porcelain base, 0.08-1.0g of yellow dyeing powder, and 0.008g of brown dyeing powder.

[0071] Example 4 A method for preparing a white spot color tetracycline tooth all-ceramic color plate, the steps are as follows:

[0072] ZL3 opaque porcelain powder with a thickness of 0.5 mm was evenly coated on the zirconia inner crown of the A3 porcelain block, and sintered at 960°C for 20 minutes to complete the full-ceramic opaque coloring. The dyed porcelain powder was evenly coated on the opaque porcelain, and then the porcelain was baked at 750°C for 790 seconds. After the baking was completed, a white spot-colored tetracycline tooth full-ceramic color guide plate was obtained.

[0073] The raw material composition of the dyeing porcelain powder is as follows: 1.0 g of porcelain base, 0.3 g of white dyeing powder, and 0.008 g of brown dyeing powder.

[0074] By observing the colorimetric plate samples obtained in Examples 1 to 4, it can be found that the tetracycline tooth all-ceramic colorimetric plate obtained by the preparation method of the present invention does not show the inner crown base color, has uniform color, high color saturation, good glossiness, and high colorimetric accuracy.

[0075] Comparative Example 1

[0076] Same as Example 1, except that the coating thickness of the dyed porcelain powder is 0.9 mm. Observing the colorimetric sample, it can be found that the colorimetric sample obtained in this comparative example has the base color of the crown showing through, and the color distribution is uneven, the color saturation and glossiness of the colorimetric sample are low, and accurate color comparison cannot be achieved.

[0077] Comparative Example 2

[0078] The same as Example 1, except that the coating thickness of the dyed porcelain powder is 1.4 mm. By observing the colorimetric sample, it can be found that the colorimetric sample obtained in this comparative example does not show the base color of the inner crown, the edges of the cut ends of the porcelain layer do not fit after sintering, the glossiness is significantly deteriorated, and it is easy to separate from the opaque porcelain layer, and accurate color comparison cannot be achieved.

[0079] Comparative Example 3

[0080] The same as Example 1, except that the porcelain baking temperature is 730° C. By observing the colorimetric plate sample, it can be found that the colorimetric plate sample obtained in this comparative example has poor glossiness and cannot achieve accurate color comparison.

[0081] Comparative Example 4

[0082] Same as Example 1, except that the porcelain baking temperature is 770° C. Observation of the colorimetric plate samples shows that the colorimetric plate samples obtained in this comparative example have deformed dyed porcelain powder layers, uneven surfaces, impaired glossiness, and generally have reduced bonding strength with the base material, delamination and shedding, and the defective rate is about 30%.

[0083] Example 5

[0084] Same as Example 1, except that the porcelain baking temperature is 740° C. and the porcelain baking time is 730 s.

[0085] Example 6

[0086] Same as Example 1, except that the porcelain firing temperature is 760° C. and the porcelain firing time is 850 s.

[0087] Example 7

[0088] Same as Example 1, except that the coating thickness of the dyed porcelain powder is 1.0 mm.

[0089] Example 8

[0090] Same as Example 1, except that the coating thickness of the dyed porcelain powder is 1.3 mm.

[0091] By observing the colorimetric plate samples obtained in Examples 5 to 8, it can be found that the tetracycline tooth all-ceramic colorimetric plate samples obtained in Examples 5 to 8 do not show the inner crown base color, have uniform color, high color saturation, good gloss, and high colorimetric accuracy.

[0092] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A method for preparing a tetracycline tooth all-ceramic colorimetric plate, characterized in that: Here are the steps: First, determine the base color of the color plate, then evenly apply the opaque porcelain powder on the inner crown for full-ceramic color masking and then sinter to form opaque porcelain. After sintering, evenly apply the dyeing porcelain powder on the opaque porcelain, and then perform porcelain baking. After porcelain baking, a tetracycline tooth full-ceramic color comparison plate is obtained.

2. The preparation method according to claim 1, characterized in that: The inner crown is a zirconium oxide inner crown.

3. The preparation method according to claim 1, characterized in that: The opaque porcelain powder is opaque porcelain powder ZL3.

4. The preparation method according to claim 1, characterized in that: The sintering temperature is 960° C. and the sintering time is 20 minutes.

5. The preparation method according to claim 1, characterized in that: The preparation method of the dyed porcelain powder is as follows: adding a porcelain base into a dyeing powder to obtain a mixed powder, mixing the powder evenly with distilled water, and removing excess water to obtain the mixed powder.

6. The preparation method according to claim 1, characterized in that: The dyed porcelain powder is brown, orange, dark yellow or white spot color.

7. The preparation method according to claim 6, characterized in that: The brown-based dyed porcelain powder comprises the following raw materials: 0.8 to 1.0 parts by mass of a porcelain base, 0.015 to 0.025 parts by mass of a brown dyeing powder, and 0.003 to 0.005 parts by mass of a black dyeing powder; the orange-based dyed porcelain powder comprises the following raw materials: 0.8 to 1.0 parts by mass of a porcelain base, 0.03 to 0.05 parts by mass of an orange dyeing powder, and 0.005 to 0.008 parts by mass of a black dyeing powder; the dark yellow-based dyed porcelain powder comprises the following raw materials: 0.8 to 1.0 parts by mass of a porcelain base, 0.08 to 1.0 parts by mass of a yellow dyeing powder, and 0.008 to 0.01 parts by mass of a brown dyeing powder; the white spot-based dyed porcelain powder comprises the following raw materials: 0.8 to 1.0 parts by mass of a porcelain base, 0.4 to 0.6 parts by mass of a white dyeing powder, and 0.008 to 0.01 parts by mass of a brown dyeing powder.

8. The preparation method according to claim 1, characterized in that: The coating thickness of the dyed porcelain powder is 1.0-1.3 mm.

9. The preparation method according to claim 1, characterized in that: The porcelain baking temperature is 740° C. to 760° C., and the porcelain baking time is 780 to 800 seconds.

10. A tetracycline tooth all-ceramic colorimetric plate, characterized in that: Prepared by the method according to any one of claims 1 to 9.

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