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Cutable bioactive devitrified glass and its prepn
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A glass-ceramic, bioactive technology, applied in the direction of dentures, etc., can solve the problems of strength, bioactivity and mechanical processing performance, and achieve good biocompatibility
Inactive Publication Date: 2004-10-20
TSINGHUA UNIV
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[0003] In 1983 and 1987, the German patent DE 330664A and the Chinese patent CN 1035999A respectively reported in Na 2 O-K 2 O-CaO-MgO-Al 2 o 3 -SiO 2 -P 2 o 5 In the -F system, a biological glass-ceramic with apatite and fluorophlogopite as the main crystal phase is obtained, but the material is not ideal in terms of strength, biological activity and mechanical processing performance, which limits the application of this material
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Embodiment 1
[0023] will contain 45% SiO 2 , 10%Al 2 o 3 , 5% MgO, 6% K 2 O, 8% MgF 2 , 6%P 2 o 5 , 15% CaO, 5% ZrO 2 The chemical analysis of pure raw materials is mixed evenly, put into an alumina crucible, and melted at 1460°C for 3 hours, and the molten glass liquid is cast into a tooth mold to form a blank, cooled to room temperature, and then heated to 600°C for nucleation After 1 hour, crystallize at 950° C. for 3 hours to obtain a glass-ceramic artificial tooth with an ivory white color and good gloss.
Embodiment 2
[0025] will contain 35% SiO 2 , 8%Al 2 o 3 , 7% MgO, 4% K 2 O, 15% MgF 2 , 5%P 2 o 5 , 18% CaO, 8% ZrO 2 The chemical analysis of pure raw materials is mixed evenly, put into an alumina crucible, melted at 1500°C for 3 hours, cast the molten glass liquid into a bone mold to form a blank, cool to room temperature, and then heat up to 650°C for nucleation 1 hour, crystallization at 850° C. for 4 hours, and finally finish processing the above-mentioned heat-treated blank to obtain a glass-ceramic artificial bone with a smooth surface and a three-point bending strength of 191 MPa.
Embodiment 3
[0027] will contain 28% SiO 2 , 5%Al 2 o 3 , 15% MgO, 3% K 2 O, 6% MgF 2 , 8%P 2 o 5 , 20% CaO, 15% ZrO 2 The chemical analysis of pure raw materials is mixed evenly, put into an alumina crucible, melted at 1460°C for 3 hours, cast the molten glass liquid into a bone mold to form a blank, cool to room temperature, and then heat up to 550°C for nucleation 1 hour, crystallization at 750° C. for 4 hours, and finally finishing the rough body after the above heat treatment to obtain a glass-ceramic artificial bone with a smooth surface and a three-point bending strength of 198 MPa.
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Abstract
The invention relates to a machinable bio-active nucleated glass and its preparation method. Said preparation method includes the following steps: firstly, uniformly mixing raw materials according to a certain proportion, melting them at 1400-1550 deg.C for 2-4 hr., pouring the molten glass liquor into mould and forming to make blank, cooling to room temp., heating and heat-insulating to make glass nucleate, continuously heating and heat-insulating to make gas crystallize to obtain biological nucleated glass using apatite and fluorophlogopite as main crystal phase. Said product also contains a certain reinforced phase formed fronm leucite and wollastonite, and possesses good biological compatibility, machinability and beautifulness.
Description
technical background [0001] The invention relates to a cuttable bioactive glass-ceramic and a preparation method thereof, belonging to the technical field of glass ceramics. Background technique [0002] Biomaterials are a class of materials that can repair, replace and regenerate body tissues and have special functions. (biologically active or biologically inert), but also have good machinability (including machinability, etc.). More than 70% of human bones and teeth are composed of apatite, and the rest are composed of collagen, so if the glass ceramic contains fluorapatite phase, it will have good biocompatibility; if it contains a layered structure Fluorphlogopite phase, then it will have good machinability. [0003] In 1983 and 1987, the German patent DE 330664A and the Chinese patent CN 1035999A respectively reported in Na 2 O-K 2 O-CaO-MgO-Al 2 o 3 -SiO 2 -P 2 o 5 In the -F system, a biological glass-ceramic with apatite and fluorophlogopite as the main cryst...
Claims
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Application Information
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