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Method for preparing alumina prefabricated block used for dental repair by gel casting method

A technique for dental restoration and gel injection molding, which is applied in dentistry, compression molding cups, dental preparations, etc. It can solve the problems of large crack-like holes, large equipment dependence, and reduced bending strength of final composite materials.

Inactive Publication Date: 2005-03-16
北京博方生物医用材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, isostatic pressing is dry forming, and there is agglomeration between alumina particles, and large crack-like holes will appear after partial sintering, thereby reducing the bending strength of the final composite material; secondly, isostatic pressing has a negative impact on equipment Requires a special isostatic pressing machine, which is highly dependent on equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] In order to better describe the present invention, an example will be provided below.

[0015] 75.24 grams of micron alumina powder with an average particle size of 2-5 microns, 3.96 grams of submicron alumina powder with an average particle size of 0.3-0.5 microns, 26 grams of deionized water, 0.2 grams of dispersant D9300, 0.4 grams of methyl Acrylamide and 0.2 g of NN'-dimethyl acrylamide were mixed and ball milled for 24 hours. After adding 0.2 g of ammonium persulfate and 0.4 g of tetramethylethylenediamine, vacuum exhaust and injection molding to obtain volume solid content 75% of the body; dry the body at 80°C for 24 hours, a volume shrinkage of 3 to 4% occurs, and then heat up to 600°C at 2°C / min and keep it warm for 2 hours for degreasing; then at 10°C / min is increased to 1500°C and kept for 4 hours.

[0016] The density of the sintered alumina ceramic preform is 2.86g / cm 3 , The average pore diameter is 295nm, the bending strength is 180Mpa, and the fracture toug...

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Abstract

The invention provides a method for preparing alumina prefabricated block used for dental repair by gel casting method which consists of mixing two types of aluminium oxide powders of different particle sizes, deionized water and gel monomer, charging initiator and catalyst gel for forming, then proceeding partial sintering.

Description

Technical field [0001] The invention relates to a method for preparing a glass-infiltrated ceramic ceramic matrix for dental restoration. technical background [0002] Compared with gold-ceramic materials, all-ceramic materials have been more and more widely used in the field of dental restorations due to their better biocompatibility and aesthetic effects. Among the all-ceramic materials currently appearing, such as DicorMGC, Vita Mark II, IPS Empress, Optec Pressable Ceramc (OPC), Optec HSP, Duceram LFC, Vita In-Ceram, due to the limitation of mechanical properties, only In-ceram technology is used. The glass-permeable ceramic composite materials, such as Vita In-Ceram, have flexural strength and fracture toughness that can meet the requirements for making bridges and posterior crowns. [0003] In 1990, Levy was the first to use In-Ceram technology to make all-ceramic crown restorations. The method was to make high-purity alumina powder into a slurry with a higher volume conten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61C13/083A61K6/04C04B35/10C04B35/64
Inventor 曹小刚田杰谟
Owner 北京博方生物医用材料有限公司