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A preparation method of transparent ceramic self-ligating bracket

A technology of self-locking brackets and transparent ceramics, applied in the direction of brackets, etc., can solve the problems of not being applied in industrial production, long heat preservation time, large fluctuations, etc., achieve excellent water solubility and thermoplasticity, prevent segregation of feeding components, prevent bubbly effect

Active Publication Date: 2021-08-17
湖南英捷高科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these processes have various disadvantages to varying degrees.
For example: 1) The preparation method includes isostatic pressing, machining and other processes, and the preparation cost is high; 2) Using a single thermal degreasing method, the holding time is long (20-40h), and the production efficiency is low; 3) The sintering temperature is high (1700 ~1900℃), high requirements for process equipment; 4) Unstable performance (light transmittance 10% ~ 70%), large fluctuations
Therefore, it has not been widely used in industrial production

Method used

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  • A preparation method of transparent ceramic self-ligating bracket
  • A preparation method of transparent ceramic self-ligating bracket
  • A preparation method of transparent ceramic self-ligating bracket

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example 1

[0042] A preparation process for a transparent ceramic self-ligating bracket, the process is as follows:

[0043] A. Raw material preparation: The base material is mixed with high-purity alumina powder with an average particle size of 200nm and 0.3% MgO powder provided by Sumitomo Corporation of Japan. The composition of the alumina powder is shown in Table 1. figure 1 It is the SEM topography figure of alumina powder;

[0044] Table 1 Composition of alumina powder

[0045]

[0046] B, preparation of binding agent: according to mass percentage, take polyethylene glycol (PEG) 65%, polyethylene wax (PE wax) 30%, stearic acid (SA) 5%, at 110 ℃ of temperature in the mixer Mix in medium for 4h to make binder;

[0047] C. Preparation of feeding material: mixing and granulating the binder and matrix material according to the volume ratio of 43%:57% to make feeding material. The mixing temperature is 110°C, and the speed of the mixer is 85r / min. The time is 4h;

[0048] D. Inje...

example 2

[0053] A preparation process for a transparent ceramic self-ligating bracket, the process is as follows:

[0054] A. Raw material preparation: the matrix material uses high-purity alumina powder with an average particle size of 200nm and 0.2% MgO+0.2% Y 2 o 3 Powder mixing, the composition of alumina powder is shown in Table 1, figure 1 It is the SEM topography figure of alumina powder;

[0055] B, preparation of binding agent: according to mass percentage, get polyethylene glycol (PEG) 68%, polyethylene wax (PE wax) 30%, stearic acid (SA) 2%, at 120 ℃ of temperature in the mixer Mix in medium for 3h to make binder;

[0056] C. Preparation of feeding material: mixing and granulating the binder and base material according to the volume ratio of 45%:55% to make feeding material. The mixing temperature is 120°C, and the speed of the mixer is 90r / min. The time is 3h;

[0057] D. Injection molding: use the injection molding machine to inject the feed into the mold cavity to o...

example 3

[0062] A preparation process for a transparent ceramic self-ligating bracket, the process is as follows:

[0063] A. Raw material preparation: the matrix material uses high-purity alumina powder with an average particle size of 200nm and 0.2% MgO+0.2% La provided by Sumitomo Corporation of Japan. 2 o 3 The composition of the alumina powder is shown in Table 1, and Figure 1 is the SEM morphology of the alumina powder;

[0064] B, preparation of binding agent: according to mass percentage, take polyethylene glycol (PEG) 70%, polyethylene wax (PE wax) 28%, stearic acid (SA) 2%, at 130 ℃ of temperature in the mixer Mix in medium for 2h to prepare binder;

[0065] C. Preparation of feeding material: mixing and granulating the binder and base material according to the volume ratio of 48%:52% to make feeding material. The mixing temperature is 130°C, and the speed of the mixer is 100r / min. The time is 2h;

[0066] D. Injection molding: use the injection molding machine to inject ...

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Abstract

The invention discloses a method for preparing a transparent ceramic self-locking bracket. The alumina powder is mixed with a sintering aid to obtain a matrix material, and the material is mixed with a binder to obtain uniform feeding; and then an injection molding machine is used to obtain the preparation method The raw material is injected into the mold cavity to obtain the product green body; then the binder in the green body is removed through water extraction degreasing and thermal degreasing processes, and finally the transparent ceramic self-locking bracket product is obtained by step-by-step sintering and densification. Compared with the prior art, the transparent ceramic self-locking bracket produced by the powder injection molding technology in the present invention has the characteristics of high processing efficiency, low production cost, and easy realization of batch production, and can prepare products with excellent performance, which are resistant to Bending strength ≥ 455MPa, hardness HV ≥ 1990, total light transmittance ≥ 93%, 30% better than similar products, and can well meet customer needs.

Description

technical field [0001] The invention relates to a preparation method of a bracket, in particular to a preparation method of a transparent ceramic self-locking bracket. Background technique [0002] Brackets are an important part of fixed orthodontic technology. They are appliances for correcting deformed teeth. They are directly bonded to the crowns with special adhesives, and then the arch wires are used to apply orthodontic force to the teeth through the brackets to achieve orthodontics. the goal of. Self-ligating brackets are a new type of orthosis derived from traditional brackets. They have the advantages of small frictional resistance between the arch wire and brackets, short treatment time, easy cleaning, and comfortable wearing. They are more efficient, A new, easier way to straighten your teeth. At present, the materials of self-ligating brackets used in clinical practice are mainly metal and ceramic. With the rapid development of the times, more and more dental ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/10C04B35/622A61C7/14
CPCA61C7/14C04B35/10C04B35/622C04B2235/3206C04B2235/3225C04B2235/3227C04B2235/5445C04B2235/5454C04B2235/6022C04B2235/656C04B2235/6562C04B2235/6567C04B2235/658C04B2235/96C04B2235/9653
Inventor 余勇李益民何浩胡幼华王霄
Owner 湖南英捷高科技有限责任公司
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