Process for manufacturing zirconium oxide/lanthanum phosphoric acid full porcelain oral cavity body material which can be cut

An oral prosthesis, lanthanum phosphate technology, applied in the directions of phosphates, phosphorus oxyacids, dental preparations, etc., can solve the problems of poor neck aesthetics, weak gold-ceramic bonding, and high failure rate of the prosthesis, and achieves improved Success rate and scope of application, reducing processing cost and improving the effect of success rate

Inactive Publication Date: 2008-07-16
SHANGHAI UNIV
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  • Summary
  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

However, the first two materials have low strength (about 200MPa) and poor toughness, resulting in a high failure rate in clinical trials, which limits their application, such as Dicor molar crowns
Although the In-Ceram porcelain crown with high strength (about 341 MPa) was obtained by sintering with glass infiltration method, its toughness is not enough, it is limited to single crown and anterior tooth restoration, and the process is too complicated
Porcelain-fused-to-metal restorations use metal substrates to enhance the strength of ceramics. With the deepening of clinical application research, metal corrosion and discoloration, coloring of gums, dentin hypersensitivity caused by high thermal conductivity of metals, and aesthetics of the neck of restorations gradually appear. Poor and a small number of patients are allergic to ions in metal alloys, metal-ceramic bonding is relatively weak, and porcelain-fused-to-metal restorations are prone to stress concentration that causes ceramics to crack, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 30%LaPO 4 / Y-ZrO 2 Composite ceramic preparation, the specific process steps are as follows:

[0024] a. Preparation of pure lanthanum phosphate powder: La:P (molar ratio) is 1:1, slowly add lanthanum oxide (particle diameter≤0.2um, purity>99.9%) into phosphoric acid aqueous solution diluted by deionized water (temperature 20°C), after the reaction is completed, the reaction product is washed with deionized water until the pH value of the filtrate is close to 7. Dry the powder with a rotary evaporator and calcinate at 1000°C for 2 hours to obtain lanthanum phosphate powder;

[0025] b. Preparation of mixed powder: mix the above-mentioned lanthanum phosphate powder and zirconia in a mass ratio of 30:70, wherein Y in zirconia 2 o 3 and ZrO 2 The mol ratio is 3: 97, and in the polyurethane ball mill jar of packing into, with mixing material: agate ball: the mass ratio of ethanol=1: 1.2: 0.8 adds agate ball and ethanol, carries out ball mill with the rotating speed of ...

Embodiment 2

[0029] 40%LaPO 4 / Y-ZrO 2 The preparation of composite ceramics is basically the same as the above-mentioned embodiment, the difference is:

[0030] a. The preparation of pure lanthanum phosphate powder: by La:P (molar ratio) is 1: 1, lanthanum oxide (particle diameter≤0.2um, purity>99.9%) is slowly added by the phosphoric acid aqueous solution ( temperature 20°C), after the reaction is completed, the reaction product is washed with deionized water until the pH value of the filtrate is close to 7. Dry the powder with a rotary evaporator and calcinate at 1000°C for 2 hours to obtain lanthanum phosphate powder;

[0031] b. Preparation of mixed powder: mix yttrium oxide, lanthanum phosphate powder and zirconia in a mass ratio of 3:40:57, wherein Y in zirconia 2 o 3 and ZrO 2 The mol ratio is 3: 97, and in the polyurethane ball mill tank of packing into, with mixing: agate ball: the mass ratio of ethanol=1: 1.2: 0.8 adds agate ball and and ethanol, carries out ball milling wi...

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Abstract

The invention relates to a preparation method of an all-ceramic oral cavity repairing composite material with machinable zirconia/lanthanum phosphate, belonging to an inorganic composite material preparation field. The method of the invention is essentially characterized by adjusting the strength and toughness of compound ceramic of zirconia and lanthanum phosphate through controlling the content of zirconia and lanthanum phosphate; the preparation technology of the invention comprises the following processes: lanthanum phosphate powders are prepared; mixture powders of yttrium oxide, lanthanum phosphate and zirconia are prepared by a certain mass ratio; isostatic pressing and sintering is carried out for the mixture under 150 to 250MPa and 1,500 to 1,650 DEG C respectively; and finally the dental composite ceramic material with machinable zirconia and lanthanum phosphate of the invention is obtained. The composite of the invention is suitable for all-ceramic dental repair of oral cavity clinic.

Description

Technical field: [0001] The invention relates to a preparation method of a machinable zirconia / lanthanum phosphate all-ceramic dental restoration material, which belongs to the technical field of inorganic composite material manufacturing technology. Background technique: [0002] With the improvement of people's living standards and quality, accidents occur in daily life, and oral restoration becomes increasingly important. The current dental materials have developed from the original animal teeth to the extensive use of metal materials, resin materials and ceramic materials. Compared with metal and polymer dental restorations, all-ceramic dental restorations can have similar refraction and scattering coefficients to tooth tissue, and can reproduce the transparency and color of natural teeth. In addition, ceramic materials have high chemical stability, good biocompatibility, similar thermal expansion coefficient to tooth tissue, and do not degrade in the oral environment. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/622C01B25/26A61K6/02
Inventor 沈悦徐旭东顾峰张宝卫
Owner SHANGHAI UNIV
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