Processing method for restoring all-ceramic substrate material

A technology of base material and processing method, which is applied in the field of preparation and processing of all-ceramic base materials for restoration, and can solve problems such as cracking of outer layer porcelain, low thermal conductivity, failure of bridge repair, etc., and achieve the effect of solving poor bonding force

Active Publication Date: 2015-03-25
GENERAL HOSPITAL OF PLA
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Problems solved by technology

[0003] The all-ceramic restoration made by the above method requires secondary sintering. This process is accompanied by about 30% volume shrinkage and irregular shape changes, which affects the accuracy of the restoration. For bridges with long spans, it is easy to cause restoration failure and increase Process link and production cost
In addition, due to the large differences in the composition, thermal expansion coefficient, a

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  • Processing method for restoring all-ceramic substrate material

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[0024] The technical solutions of the present invention will be further described in detail below through the accompanying drawings and embodiments.

[0025] The machinable ceramics in the processing method for repairing all-ceramic base materials of the present invention can unify the strength and machinability, because the machinability index M=K IC / H V , Good processability requires high K IC And low hardness. Low hardness means that the internal bonding of the material is weak, which leads to a decrease in material strength. But the strength of the material can pass K IC To improve. K as one of the basic properties of materials IC It is the tissue sensitivity factor, which is the resistance encountered when cracks in the material develop instability. The toughening of ceramic materials has been developed relatively well, which provides a possibility to apply some advanced toughening mechanisms to machinable ceramics, and it is possible to obtain both strength and wo...

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Abstract

The invention relates to a processing method for restoring an all-ceramic substrate material. The method comprises the following steps: acquiring Al2O3-coated ZrO2 composite powder by utilizing a gel precipitation method; preparing Al2O3/BN co-coated ZrO2 composite powder; dispersing the Al2O3 and BN co-coated ZrO2 composite powder in polyethyleneimine, inducing in a closed circuit high-intensity magnetic field, and meanwhile carrying out electrophoretic sedimentation so as to obtain powder body; sintering the powder body in a spark plasma or hot pressing mode so as to obtain the restored all-ceramic substrate material. According to the invention, free energy is generated by an echelon standard so as to solve the problems of deoxidation and discoloration during hot pressing and sintering of oxide ceramics. Components and the chemical states of a crystal boundary are controlled, so that a sintered body of the material has the processability; the deformation problem of an incomplete sintered block body of a commercial substrate ceramic after densifying at present is overcome; chemical bonding with a conventional veneering ceramic is achieved; the problem of poor bonding force of a zirconia all-ceramic substrate and the veneering ceramic is solved.

Description

Technical field [0001] The invention relates to a processing method for restoring all-ceramic base materials, in particular to a preparation and processing method for restoring all-ceramic base materials based on nanocrystalline coating and strong magnetic field texture for stomatology. Background technique [0002] Porcelain fusion metal prosthesis accounts for more than 70% of all repair methods in young and middle-aged patients in dental prosthesis clinic, and is the first choice for doctors and patients. However, metal substrates have long-term release of ions in saliva, which not only affects the appearance, but also the most commonly used nickel-based alloys are harmful to human health. In recent years, porcelain-based all-ceramic restorations have appeared internationally. They use high-strength ceramics instead of metal as the internal substrate, which significantly improves the color simulation, biological safety and chemical stability of the denture, and overcomes the m...

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Application Information

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IPC IPC(8): C04B35/48C04B35/622C04B35/628
Inventor 杨瑟飞温宁吴金双顾斌
Owner GENERAL HOSPITAL OF PLA
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