Orthodontic highly-transparent ceramic bracket and making method thereof

A technology of transparent ceramics and brackets, applied in the direction of brackets, etc., to achieve the effect of lowering sintering temperature, easy operation and high transparency

Inactive Publication Date: 2013-08-28
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent ZL200510035081.X discloses a "transparent alumina bracket and its preparation method", the Al 2 o 3 Although the three-point bending strength of ceramic brackets is high, the linear light transmittance is 10-70%, and its transparency needs to be further improved

Method used

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  • Orthodontic highly-transparent ceramic bracket and making method thereof
  • Orthodontic highly-transparent ceramic bracket and making method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In the present embodiment, the process steps of preparing the highly transparent ceramic brackets for orthodontics are as follows:

[0031] (1) Preparation of yttrium aluminum garnet (YAG) transparent ceramic powder

[0032] With purity ≥ 99.0% Y (NO 3 ) 3 and NH with purity ≥99.5% 4 Al(SO 4 ) 2 ?12H 2 O is a raw material, and the Y(NO 3 ) 3 with NH 4 Al(SO 4 ) 2 ?12H 2 The molar ratio of O is 0.6:1, with NH 4 HCO 3 As a precipitating agent, the NH 4 HCO 3 with NH 4 Al(SO 4 ) 2 ?12H 2 The molar ratio of O is 1:0.1; Y(NO 3 ) 3 and NH 4 Al(SO 4 ) 2 ?12H 2 O was dissolved in deionized water and formulated as Y 3+ A mixed salt solution with a concentration of 0.1mol / L; the NH measured in the above molar ratio 4 HCO 3 Dissolved in deionized water, formulated as NH 4 HCO 3Precipitant solution with a concentration of 0.4mol / L; at normal pressure and 18°C, drop the prepared mixed salt solution into the prepared precipitant solution at a rate of 220 ...

Embodiment 2

[0043] In the present embodiment, the process steps of preparing the highly transparent ceramic brackets for orthodontics are as follows:

[0044] (1) Preparation of yttrium aluminum garnet (YAG) transparent ceramic powder

[0045] The difference between this preparation method and the preparation method of step (1) in Example 1 is that the YAG precursor is fired at 1100°C for 4 hours, and the average grain size of the prepared yttrium aluminum garnet transparent ceramic powder is is 50 nm.

[0046] (2) Preparation of slurry

[0047] The raw materials are yttrium aluminum garnet transparent ceramic powder with a purity ≥99.0% prepared in step (1), composite sintering aids, polyacrylic acid and deionized water, and the composite sintering aids are made of SiO 2 and MgO composition, SiO 2 The weight ratio to MgO is 4:1, the composite sintering aid is 0.28% of the weight of the yttrium aluminum garnet transparent ceramic powder, polyacrylic acid is 3% of the weight of the yttr...

Embodiment 3

[0056] In the present embodiment, the process steps of preparing the highly transparent ceramic brackets for orthodontics are as follows:

[0057] (1) Preparation of magnesium aluminum spinel (MgAl 2 o 4 ) transparent ceramic powder

[0058] MgSO with purity ≥99.0% 4 ?7H 2 O and NH with purity ≥99.5% 4 Al(SO 4 ) 2 ?12H 2 O is the raw material, the MgSO 4 ?7H 2 O and NH 4 Al(SO 4 ) 2 ?12H 2 The proportion of O is weighed according to the molar ratio of Mg and Al being 1:2. The weighed MgSO 4 ?7H 2 O and NH 4 Al(SO 4 ) 2 ?12H 2 O was put into a quartz cup, added deionized water and stirred to form a mixed solution (the amount of deionized water was submerged over MgSO 4 ?7H 2 O and NH 4 Al(SO 4 ) 2 ?12H 2 O can be), the mixed solution was placed in a muffle furnace, heated to 1100 °C at a rate of 10 °C / min and roasted for 4 hours, and then naturally cooled to room temperature to obtain white and fluffy MgAl 2 o 4 The powder is ground and sieved with a ...

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Abstract

An orthodontic highly-transparent ceramic bracket comprises a baseboard, and trough limbs, a trough slot and a ligation limb slot which are arranged on the baseboard, and the ceramic bracket is a yttrium aluminum garnet ceramic bracket, a magnesium aluminate spinel ceramic bracket or a spinel aluminum oxynitride ceramic bracket, and has a linear transmittance of above 70%. A preparation method of the highly-transparent ceramic bracket comprises the following steps: 1, slurry preparation: ball-milling raw materials with Al2O3 balls as a ball milling medium for 24-48h, wherein the raw materials comprise transparent ceramic powder, a composite sintering aid, polyacrylic acid and deionized water, the composite sintering aid accounts for 0.1-0.6% of the weight of the transparent ceramic powder, polyacrylic acid accounts for 1-5% of the weight of the transparent ceramic powder, the ratio of the total weight the transparent ceramic powder, the composite sintering aid and polyacrylic acid to the weight of deionized water is 1:4-8, and the transparent ceramic powder is yttrium aluminum garnet ceramic powder, magnesium aluminate spinel ceramic powder or spinel aluminum oxynitride ceramic powder; 2, molding and biscuit treatment; and 3, sintering.

Description

technical field [0001] The invention relates to a ceramic bracket used in orthodontic technology and a preparation method thereof. Background technique [0002] Brackets are a device that must be used in orthodontic technology. An ideal bracket should not only have biocompatibility, high strength and wear resistance, but also match the color of human teeth. Ceramic brackets have incomparable advantages over other material brackets in terms of color, luster, wear resistance and biocompatibility. Since ceramic brackets were introduced into the field of orthodontics in 1986, various types of ceramic brackets have been widely used. Used in orthodontic clinic. At present, the orthodontic ceramic brackets are mainly made of Al 2 o 3 Ceramic or ZrO 2 Ceramic preparation. Thanks Al 2 o 3 and ZrO 2 Factors such as the anisotropy of the material structure make it difficult to achieve high transparency for this type of ceramic bracket. Therefore, the matching of the bracket and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61C7/14C04B35/622
Inventor 卢铁城张伟韦建军魏念关永兵谢修敏马奔原
Owner SICHUAN UNIV
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