CN113133843A - False tooth preparation method - Google Patents

False tooth preparation method Download PDF

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Publication number
CN113133843A
CN113133843A CN202110479527.7A CN202110479527A CN113133843A CN 113133843 A CN113133843 A CN 113133843A CN 202110479527 A CN202110479527 A CN 202110479527A CN 113133843 A CN113133843 A CN 113133843A
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Prior art keywords
zirconia
base
teeth
tooth
paraffin
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CN202110479527.7A
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Inventor
卢志国
柏平
余怀涛
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Chongqing Haochi Denture Manufacturing Co ltd
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Chongqing Haochi Denture Manufacturing Co ltd
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Priority to CN202110479527.7A priority Critical patent/CN113133843A/en
Publication of CN113133843A publication Critical patent/CN113133843A/en
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61CDENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C13/00Dental prostheses; Making same
    • A61C13/08Artificial teeth; Making same
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61CDENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C13/00Dental prostheses; Making same
    • A61C13/0003Making bridge-work, inlays, implants or the like
    • A61C13/0004Computer-assisted sizing or machining of dental prostheses
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61CDENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C13/00Dental prostheses; Making same
    • A61C13/0003Making bridge-work, inlays, implants or the like
    • A61C13/0006Production methods
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61CDENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C13/00Dental prostheses; Making same
    • A61C13/08Artificial teeth; Making same
    • A61C13/083Porcelain or ceramic teeth
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61CDENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C13/00Dental prostheses; Making same
    • A61C13/34Making or working of models, e.g. preliminary castings, trial dentures; Dowel pins [4]
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/48Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on zirconium or hafnium oxides, zirconates, zircon or hafnates
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Veterinary Medicine (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Public Health (AREA)
  • Dentistry (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Composite Materials (AREA)
  • Dental Prosthetics (AREA)

Abstract

The invention belongs to the technical field of denture processing, and particularly relates to a denture preparation method, which comprises the following steps: (1) obtaining a three-dimensional model of a patient's mouth; (2) designing a base, and designing a paraffin base tooth on the base; (3) designing a plurality of tooth monomers according to the base; (4) selecting blocky zirconia, sintering the blocky zirconia, then cutting to obtain zirconia teeth, reserving a position-retaining hole at the bottom of the zirconia teeth, and sintering the zirconia teeth again; trimming the re-sintered zirconia tooth, and glazing; (5) preliminarily arranging and fixing the processed zirconia teeth on the paraffin-based teeth of the base in sequence; (6) finally fixing the zirconia teeth by embedding and filling the glue or injecting and filling the glue to obtain the false tooth. The artificial tooth can be customized according to the condition of a patient, and the artificial tooth is more suitable for individuals, and has better performance in the aspects of strength, attractiveness, color and the like due to the fact that the teeth are made of the zirconium oxide.

Description

False tooth preparation method
Technical Field
The invention belongs to the technical field of false tooth processing, and particularly relates to a false tooth preparation method.
Background
The artificial tooth is a prosthesis used for replacing original teeth to achieve chewing and aesthetic functions when the teeth are missing. Generally, when the missing teeth in the mouth of a patient are small, a corresponding denture can be installed at the missing part; when the number of missing teeth in the mouth of a patient is large, the missing teeth need to be repaired by a complete digital removable denture. The complete denture comprises a base and a plurality of tooth monomers fixed on the base. Most of the tooth monomers on the existing complete denture are obtained by filling resin, although the resin teeth are relatively cheap, the simulation degree of the resin teeth is not very good, the strength is not very high, and the teeth are easy to break after long-time use.
Disclosure of Invention
The invention aims to provide a denture preparation method, which aims to solve the problems that the existing complete denture is not high enough in tooth strength and is easy to collapse.
In order to achieve the purpose, the scheme of the invention is as follows: a denture preparation method comprises the following steps:
(1) obtaining a three-dimensional model of the patient's oral cavity;
(2) designing a base on the basis of the obtained three-dimensional model, and designing a paraffin abutment on the base; the base is a paraffin base or a metal base;
(3) scanning the three-dimensional model, the base and the paraffin base tooth together, and designing a plurality of tooth monomers according to the reserved positions on the base;
(4) selecting pressure-formed blocky zirconia, sintering the blocky zirconia, heating to 500-minus-year 580 ℃ at the heating rate of 2-4 ℃/min, preserving heat for 1-2h, heating to 900-minus-year 1000 ℃ at the heating rate of 1-3 ℃/min, preserving heat for 1-2h, and applying the pressure of 150-minus-year 200MPa to the blocky zirconia in the process; after heat preservation, the temperature is reduced to 400 ℃ at the cooling speed of 2-5 ℃/min, and finally the temperature is naturally cooled to the room temperature; cutting the sintered blocky zirconia into a designed tooth shape to obtain zirconia teeth, reserving a position-retaining hole at the bottom of the zirconia teeth, and then sintering the zirconia teeth; trimming the re-sintered zirconia tooth, and glazing;
(5) preliminarily arranging and fixing the processed zirconia teeth on a paraffin-based tooth of the base in sequence to obtain a denture model with the base;
(6) finally fixing the zirconia teeth by embedding and filling the glue or injecting and filling the glue to obtain the false tooth.
The working principle and the beneficial effects of the scheme are as follows:
the zirconium oxide has good biocompatibility, higher wear resistance and corrosion resistance and good mechanical property, the comprehensive performance of the zirconium oxide used for manufacturing the false tooth is obviously superior to that of resin, and the problem of false tooth breakage caused by long-term use can be effectively avoided. Although the zirconia has very good performance, the zirconia has a defect that the hardness of the sintered zirconia is as high as 12GPa, and only a diamond cutter can be used for cutting, so that the processing efficiency is low and the processing cost is high. At present, zirconia is pressed into blocks and is not sintered and then directly cut, and the zirconia is sintered after the cutting, but the size of the sintered zirconia is not satisfactory easily because the volume of the zirconia is greatly changed before and after sintering (the linear shrinkage rate is high by 26%). In this scheme, select for use earlier the massive zirconia of pressure forming, carry out the preliminary sintering to this massive zirconia, rising temperature speed, cooling rate, sintering temperature and sintering time among the strict control sintering process for massive zirconia after the preliminary sintering all promotes in density, performance to some extent, improves its workable performance. The blocky zirconia is sintered after the primary sintering, the hardness of the zirconia is moderate, the processing is convenient, and the processing difficulty is greatly reduced. The massive zirconia is sintered after cutting, the density and the mechanical strength of the zirconia are mainly improved by the sintering, the performance of the zirconia tooth is ensured to meet the requirements, and the volume change of the zirconia after the sintering is small (the linear shrinkage rate can be controlled to be 10-14%) by the sintering, so that the size of the finally obtained zirconia tooth is not greatly influenced.
The pressure of 150-200Mpa is applied to the blocky zirconia in the sintering process, so that the densification of the zirconia can be further accelerated, the uniformity of zirconia powder is improved, the sintering resistance is reduced, the sintering temperature is reduced, the sintering time is shortened, the processing efficiency is improved, and meanwhile, the energy is saved.
Optionally, in the step (1), an impression of the teeth is left through the occlusion of the oral cavity of the patient, and gypsum is poured on the impression of the teeth to obtain a three-dimensional model in the oral cavity of the patient; or scanning the oral cavity of the patient by using an oral scanner, modeling after obtaining the oral cavity data of the patient, and then obtaining a three-dimensional model in the oral cavity of the patient in a 3D printing mode.
Optionally, in the step (6), if the base is a paraffin base, replacing the paraffin base and the paraffin base tooth with a resin base and a resin base by embedding and filling glue or injection molding and filling glue, and finally fixing the zirconia tooth on the resin base; in the step (6), if the base is a metal base, the zirconia teeth are fixed on the paraffin base teeth, then the gingiva is made by using paraffin, so that the zirconia teeth are firmly installed on the metal base, then the gingiva and the paraffin base teeth are replaced by resin gingiva and a resin base through embedding glue filling or injection glue filling, and finally the zirconia teeth are fixed on the metal base.
Alternatively, the preparation of the pressure-formed bulk zirconia in the step (4) includes the steps of: a) preparing the following raw materials in percentage by mass: 90-100 parts of yttria-stabilized zirconia powder and 0.3-1.5 parts of graphene; b) drying the yttria-stabilized zirconia powder, then adding the yttria-stabilized zirconia powder into an absolute ethyl alcohol solution, and performing ultrasonic dispersion for 20-30min to obtain dispersion slurry; c) adding the dispersed slurry and graphene into ball milling equipment for ball milling for 8-10 h; d) filtering, and drying the materials to obtain a dry mixed material; e) and pressurizing the mixed material in a compression molding mode, controlling the pressure at 3-5Mpa, and maintaining the pressure for 30-45s to obtain the pressure-molded blocky zirconia. The addition of a trace amount of graphene in the yttria-stabilized zirconia powder can obviously improve the strength of zirconia and inhibit the formation of dental plaque to a certain extent, so that the material is more suitable for manufacturing false teeth. In the process of preparing the pressure-formed massive zirconia, the ultrasonic loading mode is helpful to reduce the agglomeration among yttria-stabilized zirconia powder, and the influence on subsequent sintering due to the agglomeration among agglomerates is avoided. The ball milling is beneficial to uniformly mixing the dispersed slurry and the graphene and controlling the particle size of the mixture, so that the mixture can be better molded after being pressurized. Finally, the massive zirconia is prepared by a compression molding mode, and the operation is simple.
Optionally, in the step d), the drying temperature is controlled at 110-125 ℃, and the drying time is 8-10 h. By the operation, the obtained mixed material is completely dry and fine, so that the mixed material can be well pressed into the blocky zirconia.
Optionally, in the step (4), the step of re-sintering the zirconia tooth is as follows: heating to 1300-class 1380 ℃ at the heating rate of 3-8 ℃/min, preserving the heat for 1.5-2.5h, then cooling to 580-class 500 ℃ at the cooling rate of 4-8 ℃/min, and finally naturally cooling to the room temperature. Through long-term research and tests of the applicant, the parameters of the re-sintering are controlled within the values, and the obtained zirconia tooth has good comprehensive performance.
Optionally, in the step (4), the temperature is increased to 550 ℃ at the temperature increase speed of 3 ℃/min, the temperature is maintained for 1.5h, then the temperature is increased to 980 ℃ at the temperature increase speed of 2 ℃/min, the temperature is maintained for 1.5h, and 180Mpa pressure is applied to the blocky zirconia in the process; cooling to 320 ℃ at the cooling speed of 3 ℃/min after heat preservation, and finally naturally cooling to room temperature. Long-term research and experiments of the applicant show that when the blocky zirconia is sintered, the comprehensive effect is best when the parameters are controlled within the numerical values.
Optionally, in the step (4), the step of re-sintering the zirconia tooth is as follows: heating to 1350 deg.C at a rate of 5 deg.C/min, holding for 2h, cooling to 540 deg.C at a rate of 4 deg.C/min, and naturally cooling to room temperature. Through long-term research and test of the applicant, the parameters of the re-sintering are controlled within the values, and the obtained zirconia tooth has the best comprehensive performance.
Detailed Description
The following is further detailed by way of specific embodiments:
example one
A denture preparation method comprises the following steps:
(1) obtaining a three-dimensional model of the patient's oral cavity; here, an impression of the teeth can be left by the patient's mouth bite, and a three-dimensional model of the patient's mouth can be obtained by pouring plaster on the impression of the teeth; or scanning the oral cavity of the patient by using an oral scanner, modeling after obtaining the oral cavity data of the patient, and then obtaining a three-dimensional model in the oral cavity of the patient in a 3D printing mode.
(2) Designing a base based on the obtained three-dimensional model, and designing a paraffin base tooth on the base, wherein the base is a paraffin base.
(3) And scanning the three-dimensional model, the base and the paraffin base tooth together, and designing a plurality of tooth monomers according to the reserved positions on the base.
(4) The preparation method of the pressure-formed blocky zirconia by selecting the pressure-formed blocky zirconia comprises the following steps: a) preparing the following raw materials in percentage by mass: 100 parts of yttria-stabilized zirconia powder and 1.2 parts of graphene; b) drying the yttria-stabilized zirconia powder, then adding the yttria-stabilized zirconia powder into an absolute ethyl alcohol solution, and performing ultrasonic dispersion for 25min to obtain dispersion slurry; c) adding the dispersion slurry and graphene into ball milling equipment for ball milling for 8 hours; d) filtering, and drying the materials to obtain a dry mixed material; the drying temperature is controlled at 120 ℃ and the drying time is 8 h. e) And pressurizing the mixed material in a compression molding mode, controlling the pressure at 4Mpa, and maintaining the pressure for 40s to obtain the pressure-molded blocky zirconia. Sintering the blocky zirconia, heating to 550 ℃ at a heating rate of 3 ℃/min, preserving heat for 1.5h, then heating to 980 ℃ at a heating rate of 2 ℃/min, preserving heat for 1.5h, and applying a pressure of 180MPa to the blocky zirconia in the process; cooling to 320 ℃ at the cooling speed of 3 ℃/min after heat preservation, and finally naturally cooling to room temperature. Cutting the sintered blocky zirconia into a designed tooth shape to obtain zirconia teeth, reserving a position-fixing hole at the bottom of the zirconia teeth, and then sintering the zirconia teeth, wherein the step of sintering the zirconia teeth comprises the following steps: heating to 1350 deg.C at a rate of 5 deg.C/min, holding for 2h, cooling to 540 deg.C at a rate of 4 deg.C/min, and naturally cooling to room temperature. And (4) trimming the re-sintered zirconia tooth, and glazing.
(5) And (3) preliminarily arranging and fixing the processed zirconia teeth on the paraffin-based teeth of the base in sequence to obtain the denture model with the base.
(6) And replacing the paraffin base and the paraffin base tooth with a resin base and a resin base by embedding and filling glue or injecting and filling glue, finally fixing the zirconia tooth on the resin base, and grinding and polishing to obtain a finished product.
Example two
The present embodiment is different from the first embodiment in that:
in the step (2), designing a base on the basis of the obtained three-dimensional model, and designing a paraffin base tooth on the base; the base support is a metal base support.
And (5) preliminarily arranging and fixing the processed zirconia teeth on the paraffin-based teeth of the base in sequence, and manufacturing gum by using paraffin after the zirconia teeth are fixed on the paraffin-based teeth so that the zirconia teeth are firmly installed on the metal base to obtain the denture model with the base.
And (6) replacing the gum and the paraffin-based teeth with resin gum and resin base by embedding and filling or injection molding and filling, finally fixing the zirconia teeth on the metal base, and grinding and polishing to obtain a finished product.
EXAMPLE III
The present embodiment is different from the first embodiment in that: in the step a), preparing the following raw materials in percentage by mass: 100 parts of yttria-stabilized zirconia powder and 0.5 part of graphene.
Example four
The present embodiment is different from the first embodiment in that: in the step (4), sintering the blocky zirconia, firstly heating to 510 ℃ at the heating rate of 2 ℃/min, preserving heat for 1h, then heating to 920 ℃ at the heating rate of 1.2 ℃/min, preserving heat for 1h, and applying 160Mpa pressure to the blocky zirconia in the process; after heat preservation, the temperature is reduced to 300 ℃ at the speed of 2 ℃/min, and finally the temperature is naturally cooled to the room temperature. Cutting the sintered blocky zirconia into a designed tooth shape to obtain zirconia teeth, reserving a position-fixing hole at the bottom of the zirconia teeth, and then sintering the zirconia teeth, wherein the step of sintering the zirconia teeth comprises the following steps: heating to 1320 ℃ at a heating rate of 3 ℃/min, preserving heat for 2h, then cooling to 510 ℃ at a cooling rate of 2 ℃/min, and finally naturally cooling to room temperature. And (4) trimming the re-sintered zirconia tooth, and glazing.
EXAMPLE five
The present embodiment is different from the first embodiment in that: in the step (4), sintering the blocky zirconia, firstly heating to 580 ℃ at a heating rate of 4 ℃/min, preserving heat for 2h, then heating to 1000 ℃ at a heating rate of 3 ℃/min, preserving heat for 2h, and applying a pressure of 200MPa to the blocky zirconia in the process; cooling to 400 deg.C at 5 deg.C/min, and naturally cooling to room temperature. Cutting the sintered blocky zirconia into a designed tooth shape to obtain zirconia teeth, reserving a position-fixing hole at the bottom of the zirconia teeth, and then sintering the zirconia teeth, wherein the step of sintering the zirconia teeth comprises the following steps: heating to 1380 ℃ at the heating rate of 6 ℃/min, preserving heat for 2h, then cooling to 500 ℃ at the cooling rate of 6 ℃/min, and finally naturally cooling to room temperature. And (4) trimming the re-sintered zirconia tooth, and glazing.

Claims (8)

1. A denture preparation method is characterized in that: the method comprises the following steps:
(1) obtaining a three-dimensional model of the patient's oral cavity;
(2) designing a base on the basis of the obtained three-dimensional model, and designing a paraffin abutment on the base; the base is a paraffin base or a metal base;
(3) scanning the three-dimensional model, the base and the paraffin base tooth together, and designing a plurality of tooth monomers according to the reserved positions on the base;
(4) selecting pressure-formed blocky zirconia, sintering the blocky zirconia, heating to 500-minus-year 580 ℃ at the heating rate of 2-4 ℃/min, preserving heat for 1-2h, heating to 900-minus-year 1000 ℃ at the heating rate of 1-3 ℃/min, preserving heat for 1-2h, and applying the pressure of 150-minus-year 200MPa to the blocky zirconia in the process; after heat preservation, the temperature is reduced to 400 ℃ at the cooling speed of 2-5 ℃/min, and finally the temperature is naturally cooled to the room temperature; cutting the sintered blocky zirconia into a designed tooth shape to obtain zirconia teeth, reserving a position-retaining hole at the bottom of the zirconia teeth, and then sintering the zirconia teeth; trimming the re-sintered zirconia tooth, and glazing;
(5) preliminarily arranging and fixing the processed zirconia teeth on a paraffin-based tooth of the base in sequence to obtain a denture model with the base;
(6) finally fixing the zirconia teeth by embedding and filling the glue or injecting and filling the glue to obtain the false tooth.
2. A denture preparation method according to claim 1, wherein: in the step (1), an impression of teeth is left through occlusion of the oral cavity of a patient, and gypsum is poured into the impression of the teeth to obtain a three-dimensional model in the oral cavity of the patient; or scanning the oral cavity of the patient by using an oral scanner, modeling after obtaining the oral cavity data of the patient, and then obtaining a three-dimensional model in the oral cavity of the patient in a 3D printing mode.
3. A denture preparation method according to claim 2, wherein: in the step (6), if the base is a paraffin base, replacing the paraffin base and the paraffin base tooth with a resin base and a resin base in an embedding glue filling or injection glue filling mode, and finally fixing the zirconia tooth on the resin base; in the step (6), if the base is a metal base, the zirconia teeth are fixed on the paraffin base teeth, then the gingiva is made by using paraffin, so that the zirconia teeth are firmly installed on the metal base, then the gingiva and the paraffin base teeth are replaced by resin gingiva and a resin base through embedding glue filling or injection glue filling, and finally the zirconia teeth are fixed on the metal base.
4. A denture preparation method according to claim 3, wherein: the preparation of the pressure-formed bulk zirconia in step (4) comprises the following steps: a) preparing the following raw materials in percentage by mass: 90-100 parts of yttria-stabilized zirconia powder and 0.3-1.5 parts of graphene; b) drying the yttria-stabilized zirconia powder, then adding the yttria-stabilized zirconia powder into an absolute ethyl alcohol solution, and performing ultrasonic dispersion for 20-30min to obtain dispersion slurry; c) adding the dispersed slurry and graphene into ball milling equipment for ball milling for 8-10 h; d) filtering, and drying the materials to obtain a dry mixed material; e) and pressurizing the mixed material in a compression molding mode, controlling the pressure at 3-5Mpa, and maintaining the pressure for 30-45s to obtain the pressure-molded blocky zirconia.
5. The denture preparation method according to claim 4, wherein: in the step d), the drying temperature is controlled at 110-125 ℃, and the drying time is 8-10 h.
6. A denture preparation method according to any one of claims 1 to 5, wherein: in the step (4), the step of re-sintering the zirconia tooth is as follows: heating to 1300-class 1380 ℃ at the heating rate of 3-8 ℃/min, preserving the heat for 1.5-2.5h, then cooling to 580-class 500 ℃ at the cooling rate of 4-8 ℃/min, and finally naturally cooling to the room temperature.
7. A denture preparation method according to claim 1, wherein: in the step (4), firstly heating to 550 ℃ at the heating rate of 3 ℃/min, preserving heat for 1.5h, then heating to 980 ℃ at the heating rate of 2 ℃/min, preserving heat for 1.5h, and applying the pressure of 180MPa to the blocky zirconia in the process; cooling to 320 ℃ at the cooling speed of 3 ℃/min after heat preservation, and finally naturally cooling to room temperature.
8. A denture preparation method according to claim 6, wherein: in the step (4), the step of re-sintering the zirconia tooth is as follows: heating to 1350 deg.C at a rate of 5 deg.C/min, holding for 2h, cooling to 540 deg.C at a rate of 4 deg.C/min, and naturally cooling to room temperature.
CN202110479527.7A 2021-04-30 2021-04-30 False tooth preparation method Pending CN113133843A (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115006029A (en) * 2022-07-08 2022-09-06 泉州市超维医疗科技有限公司 Preparation method of personalized customized porcelain teeth

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Application publication date: 20210720