Preparation method of multilayer zirconia false tooth and multilayer zirconia false tooth

Abstract

The invention provides a preparation method of a multilayer zirconia false tooth and the multilayer zirconia false tooth, and the preparation method of the multilayer zirconia false tooth comprises the following steps: dividing a target false tooth into a plurality of tooth layers, and determining a powder formula of a reference layer in the plurality of tooth layers; by taking the powder formula of the reference layer as a reference, determining powder formulas corresponding to other tooth layers except the reference layer in the plurality of tooth layers; preparing powder of each tooth layer according to the powder formula of each tooth layer; and spreading the powder of each tooth layer into a mold according to a preset sequence, compacting, and processing to obtain the multilayer zirconia false tooth. According to the invention, the powder formula of the reference layer in the plurality of tooth layers is determined, and the powder formulas of other tooth layers are determined based on the powder formula of the reference layer, so that after the zirconia porcelain block is divided into multiple layers, the color of each tooth layer is not easy to deviate on the whole tooth.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of dental materials, in particular to a multilayer zirconia denture preparation method and multilayer zirconia denture. BACKGROUND

[0002] Zirconia material is widely used in the production of dentures due to its good hardness, toughness, wear resistance and biocompatibility. The material made of zirconia doped with yttria can stabilize the tetragonal phase of zirconia, so that it can exist stably at room temperature. Zirconia denture dental products are currently the mainstream products to meet market demand, which are multilayer gradient color zirconia products. The products can be produced in one step by carving teeth and sintering, without the need for coloring. In the production process of zirconia porcelain block, colored ions are mixed into the interior of the zirconia porcelain block. The teeth produced by using this zirconia porcelain block can be formed and colored at one time. The concentration of the color-developing ions in the multilayer zirconia porcelain block decreases to achieve color gradient. Due to the demand for refinement, the concentration gradient is used to adjust the color of the target denture.

[0003] However, after the zirconia porcelain block is divided into multiple layers according to the characteristics of the product, the thickness of a single layer is very thin, which greatly affects the color judgment of the color layer of the tooth by the color observer (for example, the thickness of a single layer is only 2.3mm when the thickness of the tooth is 14mm), resulting in deviation of the products produced in batches after normal color adjustment, the deviation is magnified, and the color of the tooth is deviated.

[0004] Therefore, the prior art has defects and needs to be improved and developed. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a multilayer zirconia denture preparation method and multilayer zirconia denture to solve the problem that after the zirconia porcelain block is divided into multiple layers, the thickness of a single layer is very thin, which greatly affects the color judgment of the color layer of the tooth by the color observer, and is prone to cause deviation of the color of the tooth.

[0006] The technical solution adopted by the present application to solve the technical problem is as follows: The first aspect of the present application provides a multilayer zirconia denture preparation method, which comprises the following steps: dividing the target denture into a plurality of tooth layers and determining the powder formula of the reference layer in the plurality of tooth layers; determining the respective powder formula of each tooth layer other than the reference layer in the plurality of tooth layers based on the powder formula of the reference layer; preparing the powder of each tooth layer according to the powder formula of each tooth layer; The powder of each tooth layer is laid into the mold in a predetermined order and compacted, and the multi-layer zirconia denture is obtained after processing.

[0007] In an embodiment of the present application, the target denture is divided into several tooth layers, and a powder formula of a reference layer in the several tooth layers is determined, including: The target denture is evenly divided into several tooth layers, and a main color tone of the target denture is extracted; A powder formula of a reference layer in the several tooth layers is determined according to the main color tone of the target denture.

[0008] In an embodiment of the present application, the powder formula includes white zirconia powder and several color zirconia powders.

[0009] In an embodiment of the present application, the color zirconia powder includes yellow zirconia powder, pink zirconia powder and gray zirconia powder.

[0010] In an embodiment of the present application, the reference layer is a neck margin layer of the target denture.

[0011] In an embodiment of the present application, based on the powder formula of the reference layer, a corresponding powder formula of each tooth layer other than the reference layer in the several tooth layers is determined, including: Based on the proportion of each color zirconia powder other than the white zirconia powder in the powder formula of the reference layer, the proportion of each color zirconia powder in each tooth layer other than the reference layer is obtained by decreasing layer by layer from the incisal layer. According to the proportion of each color zirconia powder in each tooth layer, the proportion of white zirconia powder in each tooth layer is obtained, and the sum of the proportions of color zirconia powder and white zirconia powder in each tooth layer is 100%.

[0012] In an embodiment of the present application, the number of tooth layers of the target denture is six; according to the weight percentage, the proportion of color zirconia powder decreases layer by layer from the neck margin layer to the incisal layer, which is 100%, 80%, 70%, 60%, 50% and 30% respectively, and the error of the proportion of each layer is 1%.

[0013] In an embodiment of the present application, the number of tooth layers of the target denture is four; according to the weight percentage, the proportion of color zirconia powder decreases layer by layer from the neck margin layer to the incisal layer, which is 100%, 80%, 60% and 30% respectively, and the error of the proportion of each layer is 1%.

[0014] In an embodiment of the present application, the powder of each tooth layer is laid into the mold in a predetermined order and compacted, and the multi-layer zirconia denture is obtained after processing, including: The powder of each tooth layer is laid into the mold in a predetermined order, compacted, and pressed into a zirconia denture blank through a cold isostatic pressing forming process; The zirconia denture blank is pre-sintered to obtain a pre-sintered body; The pre-sintered body is carved by a tooth carving device, and the carved pre-sintered body is subjected to final sintering treatment to obtain a multilayer zirconia denture.

[0015] The second aspect embodiment of the present application provides a multilayer zirconia denture, wherein the multilayer zirconia denture is prepared by the multilayer zirconia denture preparation method as described above.

[0016] The present application has the beneficial effects that: the present application divides the target denture into a plurality of tooth layers, and determines the powder formula of the reference layer in the plurality of tooth layers; the powder formula of the reference layer is taken as a reference to determine the powder formula corresponding to each of the tooth layers other than the reference layer; the powder of each tooth layer is prepared according to the powder formula of each tooth layer; and the powder of each tooth layer is laid into the mold in a predetermined order, compacted, and treated to obtain a multilayer zirconia denture. The present application determines the powder formula of the reference layer in the plurality of tooth layers, and determines the powder formula of the other tooth layers based on the powder formula of the reference layer. The multilayer color zirconia prepared in this way has a more natural color gradient and a better overall gradient effect. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a flowchart of a preferred embodiment of a multilayer zirconia denture preparation method in the present application.

[0018] Figure 2 is a standard tooth color diagram taking a color chart as a standard.

[0019] Figure 3 is a diagram showing that the target denture is divided into six layers.

[0020] Figure 4 is a diagram showing that the target denture is divided into N layers.

[0021] Figure 5 is B4 color in 16 standard tooth colors. DETAILED DESCRIPTION

[0022] To make the purpose, technical solutions and advantages of the present application clearer and more explicit, the present application is further described in detail below with reference to the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0023] The prior art mainly has the following problems: First, the concentration gradient is not good, it will make the tooth color stratification, color gradient is not obvious, color no gradient, color abnormalities and other defects, so that the overall appearance of the teeth is very poor, customer satisfaction is low.

[0024] Second, the zirconia production of zirconia color powder respectively have yellow powder, pink powder, gray powder. Among them, the yellow powder mainly adjusts the yellow and blue axis in the color system, the yellow color developing ion is mainly iron and praseodymium, the gray powder and the pink powder mainly adjust the red and green axis in the color system, the pink color developing ion is mainly erbium, and the gray color developing ion is mainly cobalt and manganese. The color powder formula provided by each manufacturer is different. If it is not reasonable, it will make the teeth mainly reflect one of the three color developing powders, such as red: the whole tooth presents a red feeling; gray: the whole tooth presents a dark feeling; yellow: the tooth presents a yellow feeling. This makes the tooth color appear single tone, customer satisfaction is low, and it is unacceptable. Therefore, the simultaneous adjustment of the three colors greatly affects the judgment and control of tooth color.

[0025] Third, according to the characteristics of the product, the zirconia porcelain block is divided into multiple layers, and the single layer thickness is very thin. When it is placed on the whole tooth, it greatly affects the color judgment of the tooth by the color seeing personnel (for example, 14mm thickness, six layers of single layer only 2.3mm thickness), leading to color adjustment, and the deviation of the products produced in batches is enlarged, resulting in the tooth color not like, customer satisfaction is low, and it is unacceptable.

[0026] Fourth, the production of zirconia product to tooth color comparison needs about 3~5 days, and each time the tooth color is not like, the formula needs to be adjusted again, and 4N days are needed for N times of adjustment. At present, the market multi-layer gradient is mostly 6 layers, and each layer is adjusted twice, so the color adjustment period is as long as 1 and a half months, which is very unfavorable for market adjustment. And the concentration of color zirconia powder for producing zirconia porcelain block has a slight deviation every time, and each batch needs to be adjusted again. The workload is very complex and heavy.

[0027] A multilayer zirconia denture preparation method and a multilayer zirconia denture are described below with reference to the accompanying drawings. In view of the problem that after the zirconia porcelain block is divided into multiple layers, the color of each layer is prone to deviation on the whole tooth, the present application provides a multilayer zirconia denture preparation method. In the method, the target denture is divided into a plurality of tooth layers, and the powder formula of a reference layer in the plurality of tooth layers is determined; the powder formula of the reference layer is taken as a reference to determine the respective powder formula of each tooth layer other than the reference layer in the plurality of tooth layers; the powder of each tooth layer is prepared according to the powder formula of each tooth layer; and the powder of each tooth layer is laid flat in a mold in a predetermined order and compacted, and a multilayer zirconia denture is obtained after processing. By determining the powder formula of the reference layer in the plurality of tooth layers and determining the powder formula of other layers based on the powder formula of the reference layer, the color of each layer is not prone to deviation on the whole tooth after the zirconia porcelain block is divided into multiple layers.

[0028] Please refer to Figure 1 , Figure 1 is a flowchart of the multilayer zirconia denture preparation method in the present application. As shown in Figure 1 , the multilayer zirconia denture preparation method described in the present application embodiment includes the following steps: Step S100, dividing a target denture into a plurality of tooth layers and determining the powder formula of a reference layer in the plurality of tooth layers.

[0029] In the present application embodiment, the step S100 specifically includes: Step S110, dividing the target denture into a plurality of tooth layers on average and extracting the dominant color of the target denture; Step S120, determining the powder formula of the reference layer in the plurality of tooth layers according to the dominant color of the target denture.

[0030] Specifically, dividing the target denture into a plurality of tooth layers means that the target denture can be divided into many kinds, and each kind is divided into different layers. If the target denture is 6 layers, the subsequent preparation is 6 layers, and so on. The dominant color of the target denture is extracted first to control the tooth color. The dominant color is mainly the middle layer, as shown in Figure 2 , the part between the two parallel lines is the main color zone (middle layer), and the color of the main color zone is taken as the dominant color. The instrument used in the figure is a color chart, i.e. a standard tooth color.

[0031] The present application embodiment determines the powder formula of the reference layer in the plurality of tooth layers of the target denture, so as to serve as a reference for other tooth layers, avoiding various defects such as color discontinuity, unobvious color gradient, no color gradient, color anomaly, etc. of the tooth, and further preventing the color of each layer from being prone to deviation on the whole tooth, thereby improving the overall aesthetics of the denture.

[0032] In an embodiment of the present application, the powder formula comprises: white zirconia powder and several color zirconia powders.

[0033] Specifically, the color of a natural tooth is not a single pure color, but there is a color gradient at the neck margin, body and incisal end. The white zirconia powder as a base can be mixed with the color zirconia powder to simulate the stratification of dentin and enamel, so that the color of the restoration is closer to the natural tooth, and the "fake white" or monotonous feeling is avoided. By using white base powder and color powder layering and stacking, the shape and color of the denture can be completed at one time, avoiding the complex steps of traditional glazing or external staining process and reducing human error.

[0034] The present application controls the ratio of the white zirconia powder and the color zirconia powder of the base neck margin layer by comparing the main tone of the target denture, thereby making a single layer color denture, and further making a color denture of each layer.

[0035] In an embodiment of the present application, the color zirconia powder comprises: yellow zirconia powder, pink zirconia powder and gray zirconia powder.

[0036] Specifically, the yellow zirconia powder mainly adjusts the yellow-blue axis in the color system, and the yellow color developing ions are mainly iron and praseodymium. The gray zirconia powder and the pink zirconia powder mainly adjust the red-green axis in the color system, and the pink color developing ions are mainly erbium, and the gray color developing ions are mainly cobalt and manganese. The color powder formulas provided by various manufacturers are different. If the control is not reasonable, the tooth will mainly reflect one of the three color developing powders, for example, red: the tooth as a whole presents a red feeling; gray: the tooth as a whole presents a dark feeling; yellow: the tooth presents a yellow feeling. In this way, the tooth color presents a single tone, the customer satisfaction is low, and it cannot be accepted. Therefore, the simultaneous adjustment of the three colors greatly affects the judgment and control of the tooth color, and the concentration gradient needs to be adjusted by the yellow zirconia powder, the pink zirconia powder and the gray zirconia powder, and the variable is complex.

[0037] In an embodiment of the present application, the three variables are combined to control, thereby avoiding affecting the judgment of the tooth color.

[0038] In an embodiment of the present application, the reference layer is the neck margin layer of the target denture.

[0039] Specifically, the neck margin layer is a transition structure of the zirconia denture close to the gum margin (usually the area 1-2 mm of the tooth neck). The neck margin layer is the visual connection area of the restoration and the natural tooth or gum, which needs to simulate the color, shape and light transmittance of the natural tooth neck to avoid the "sudden feeling". The neck margin layer is dark in color, and the accuracy of powder matching can be improved from the neck margin layer. The incisal layer is almost colorless and transparent, and it is not easy to judge the color if it starts from the incisal layer, resulting in low accuracy of powder matching. That is, taking the color of the neck margin layer as the basis, the color matching ratio of the incisal layer can be derived, and the color matching error times are reduced.

[0040] The embodiment of the present application improves the accuracy of color matching of the target denture by taking the neck margin layer of the target denture as the reference layer.

[0041] As shown in Figure 1 The multilayer zirconia denture preparation method of the embodiment of the present application further comprises the following steps: Step S200, taking the powder formula of the reference layer as the reference, determining the respective powder formula of each tooth layer other than the reference layer in the plurality of tooth layers.

[0042] In the embodiment of the present application, the step S200 specifically comprises: Step S210, taking the proportion of each color zirconia powder other than the white zirconia powder in the powder formula of the reference layer as the reference, decreasing layer by layer to the incisal layer to obtain the proportion of each color zirconia powder in each tooth layer other than the reference layer; Step S220, according to the proportion of each color zirconia powder in each tooth layer, obtaining the proportion of white zirconia powder in each tooth layer, and the sum of the proportions of color zirconia powder and white zirconia powder in each tooth layer is 100%.

[0043] Specifically, the incisal layer is the part of the zirconia denture directly involved in occlusion or cutting function. The zirconia porcelain block is divided into multiple layers according to the characteristics of the product, and the single layer thickness is very thin. Placing it on the whole tooth greatly affects the color judgment of the color layer of the tooth by the color matching personnel (for example, six layers of single layer thickness of 2.3 mm for a 14 mm thick tooth), resulting in color matching deviation of the products produced in batches, and the deviation is magnified, leading to the problem that the tooth color is not like.

[0044] The multilayer gradient tooth of the embodiment of the present application decreases layer by layer from the neck margin layer to the incisal layer according to the weight concentration of the color powder, and the proportion of the decrease of each color zirconia powder is the same. In this way, only the powder formula of the reference layer needs to be adjusted, and the powder formula of each layer can be obtained according to the powder formula of the reference layer, avoiding the problem that the deviation of the products produced in batches is magnified, leading to the problem that the tooth color is not like.

[0045] As shown in Figure 1As shown, the multilayer zirconia denture preparation method of the embodiment of the present application further comprises the following steps: Step S300: preparing the powder of each tooth layer according to the powder formula of each tooth layer.

[0046] Specifically, the production process of the multilayer zirconia denture is: powder mixing-dry pressing-isostatic pressing-pre-sintering-tooth carving-final sintering. After the color multilayer porcelain block is evenly divided into several tooth layers, the white, yellow, pink and gray zirconia powders containing color developing ions are mixed according to the powder formula of each layer.

[0047] In an embodiment of the present application, the number of tooth layers of the target denture is six; according to the weight percentage, the proportion of the color zirconia powder is gradually decreased from the cervical margin layer to the incisal end layer according to the powder formula of the reference layer, and is 100%, 80%, 70%, 60%, 50% and 30% respectively, and the error of the proportion of each layer is 1%.

[0048] Specifically, the weight concentration of the color zirconia powder is gradually decreased from the cervical margin layer to the incisal end layer, and is 100%, 80±1%, 70±1%, 60±1%, 50±1% and 30±1% respectively. The tooth produced in this way has the best appearance and is convenient for production and color matching, and can reduce the workload by more than 50%. As shown in Table 1 and Figure 3 .

[0049]

[0050] Among them, the first layer is the proportion of the formula, and the second to sixth layers are the proportions obtained according to the powder formula of the first layer. If the powder formula of the second layer is: white zirconia powder 69%, yellow zirconia powder 23.5%, gray zirconia powder 3.5% and pink zirconia powder 4%, it can also produce teeth with similar effects to the target denture, but there may be defects such as poor transition.

[0051] The weight concentration of each color zirconia powder in each layer of the six layers of the embodiment of the present application is diluted at the same proportion, and there is no defect of poor transition.

[0052] In another embodiment of the present application, the number of tooth layers of the target denture is four; according to the weight percentage, the proportion of the color zirconia powder is gradually decreased from the cervical margin layer to the incisal end layer according to the powder formula of the reference layer, and is 100%, 80%, 60% and 30% respectively, and the error of the proportion of each layer is 1%.

[0053] Specifically, the weight concentration of the color zirconia powder is gradually decreased from the cervical margin layer to the incisal end layer, and is 100%, 80±1%, 60±1% and 30±1% respectively.

[0054] The weight concentration of each color zirconia powder in each layer of the embodiment four layers is diluted in the same ratio, and no poor transition defects occur.

[0055] Exemplarily, the embodiment of the present application can be N layers, such as Figure 4 As shown, the N layers can be in N proportionally decreasing. As long as the basic color modulation is accurate, the tooth aesthetics adjusted by the method of the embodiment of the present application is better, and no defects such as color difference, fault, and obvious gradient part occur, which directly avoids the phenomena such as color difference, fault, and obvious gradient part from the color adjustment principle.

[0056] Taking the standard tooth color on the color chart as an example, any tooth color in 16 standard tooth colors or 26 standard tooth colors can be produced by the method. As shown, Figure 5 B4 color in 16 standard tooth colors.

[0057] As shown, the multilayer zirconia denture preparation method of the embodiment of the present application further comprises the following steps: Figure 1 Step S400, the powder of each tooth layer is laid in the mold in a predetermined order and compacted, and a multilayer zirconia denture is obtained after processing.

[0058] In the embodiment of the present application, the step S400 specifically comprises: Step S410, the powder of each tooth layer is laid in the mold in a predetermined order, compacted, and pressed into a zirconia denture blank by a cold isostatic pressing forming process; Step S420, the zirconia denture blank is pre-sintered to obtain a pre-sintered body; Step S430, the pre-sintered body is carved by a tooth carving device, and the carved pre-sintered body is finally sintered to obtain a multilayer zirconia denture.

[0059] Specifically, the tooth of a single color is gradually lightened from the cervical margin layer to the incisal end layer, and the tooth is divided into N layers, so that the color of the N layers needs to be adjusted, which is a relatively large workload. In actual production, the mainstream products are mainly 4 layers and 6 layers, so the color span of each layer is large, and therefore each layer needs to be precisely adjusted in color. By mixing powder, each layer is dry-pressed, sintered, and carved, and the color difference of each layer is compared by using a color chart to adjust the color in the next round. If the overall color is the same as the color chart, the formula can be produced. When the batch of raw materials is replaced, 16 or 24 color series teeth in the color chart need to be adjusted one by one. The present application can optimize the color adjustment process. From 4 or 6 times of adjustment for each tooth in one round to only adjusting the color of the first layer, the formula of the subsequent colors is directly obtained by the gradient ratio, which is more efficient, and the carved tooth is better than the tooth adjusted by 4 or 6 layers.​

[0060] In step S420, the zirconia denture blank is pre-sintered by a heat treatment device; in step S430, final heat treatment is carried out by a final sintering device, and the obtained product is consistent with the target denture color by colorimetric comparison.

[0061] The application further discloses a multilayer zirconia denture prepared by the multilayer zirconia denture preparation method.

[0062] The application provides a multilayer zirconia denture preparation method and a multilayer zirconia denture, and the multilayer zirconia denture preparation method comprises the following steps: dividing a target denture into a plurality of tooth layers, and determining a powder formula of a reference layer in the plurality of tooth layers; taking the powder formula of the reference layer as a reference, determining a powder formula corresponding to each of the tooth layers other than the reference layer; preparing a powder of each tooth layer according to the powder formula of each tooth layer; and laying the powder of each tooth layer into a mold in a predetermined order, and compacting, so as to obtain the multilayer zirconia denture after treatment. According to the application, the powder formula of the reference layer in the plurality of tooth layers is determined, and the powder formula of the other tooth layers is determined based on the powder formula of the reference layer, so that after the zirconia porcelain block is divided into a plurality of layers, the color of each tooth layer is not easy to deviate on the whole tooth.

[0063] It should be understood that the application is not limited to the above examples, and can be improved or changed according to the above description by those skilled in the art, and all these improvements and changes should belong to the protection scope of the appended claims of the application.

Claims

1. A method for the production of a multilayer zirconia denture, characterized in that, The method comprises the following steps: dividing the target denture into several tooth layers and determining the powder formula of a reference layer among the several tooth layers; determining the powder formula corresponding to each of the tooth layers other than the reference layer based on the powder formula of the reference layer; preparing the powder of each tooth layer according to the powder formula of each tooth layer; laying the powder of each tooth layer into a mold in a predetermined order and compacting, and obtaining the multi-layer zirconia denture after treatment.

2. The multilayer zirconium oxide denture preparation method according to claim 1, characterized in that, The method for dividing the target denture into several tooth layers and determining the powder formula of a reference layer among the several tooth layers comprises the following steps: dividing the target denture into several tooth layers and extracting the main color tone of the target denture; determining the powder formula of a reference layer among the several tooth layers according to the main color tone of the target denture.

3. The method for making multilayer zirconium oxide dentures according to claim 1, characterized in that, The powder formula comprises white zirconia powder and several color zirconia powders.

4. The method for making multilayer zirconium oxide dentures according to claim 3, characterized in that, The color zirconia powders comprise yellow zirconia powder, pink zirconia powder and gray zirconia powder.

5. The method for making multilayer zirconium oxide dentures according to claim 1, characterized in that, The reference layer is the neck margin layer of the target denture.

6. The method for making multilayer zirconium oxide dentures according to claim 1, characterized in that, The method for determining the powder formula corresponding to each of the tooth layers other than the reference layer based on the powder formula of the reference layer comprises the following steps: decreasing the proportion of each color zirconia powder other than the white zirconia powder in the powder formula of the reference layer layer by layer to the incisal layer to obtain the proportion of each color zirconia powder in each of the tooth layers other than the reference layer; obtaining the proportion of the white zirconia powder in each of the tooth layers according to the proportion of each color zirconia powder in each of the tooth layers, and the sum of the proportions of the color zirconia powder and the white zirconia powder in each of the tooth layers is 100%.

7. The method for making multilayer zirconium oxide dentures according to claim 1, characterized in that, The number of tooth layers of the target denture is six; the proportion of the color zirconia powder decreases layer by layer from the neck margin layer to the incisal layer according to the powder formula of the reference layer, and is 100%, 80%, 70%, 60%, 50% and 30% respectively according to the weight percentage, and the error of the proportion of each layer is 1%.

8. The method for making multilayer zirconium oxide dentures according to claim 1, characterized in that, The number of tooth layers of the target denture is four; the proportion of the color zirconia powder decreases layer by layer from the neck margin layer to the incisal layer according to the powder formula of the reference layer, and is 100%, 80%, 60% and 30% respectively according to the weight percentage, and the error of the proportion of each layer is 1%.

9. The method for making multilayer zirconium oxide dentures according to claim 1, characterized in that, The method for laying the powder of each tooth layer into a mold in a predetermined order and compacting, and obtaining the multi-layer zirconia denture after treatment comprises the following steps: laying the powder of each tooth layer into a mold in a predetermined order, compacting, and pressing into a zirconia denture blank body through a cold isostatic pressing forming process; pre-sintering the zirconia denture blank body to obtain a pre-sintered body; carving the pre-sintered body through a carving equipment, and performing final sintering treatment on the carved pre-sintered body to obtain the multi-layer zirconia denture.

10. A multilayer zirconia denture, characterized by The multi-layer zirconia denture is prepared by the multi-layer zirconia denture preparation method according to any one of claims 1-9.

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