Process for improving translucency of CAD/CAM in-ceram zirconia dental materials

A zirconia, semi-permeable technology, used in dental preparations, dental prostheses, compression mold cups, etc., to improve transmittance, ensure consistency, and reduce porosity

Inactive Publication Date: 2010-12-29
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there is no report on the semipermeability improvement process for oral zirconia all-ceramic materials.

Method used

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  • Process for improving translucency of CAD/CAM in-ceram zirconia dental materials
  • Process for improving translucency of CAD/CAM in-ceram zirconia dental materials
  • Process for improving translucency of CAD/CAM in-ceram zirconia dental materials

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Embodiment 1 The comparative test of technique of the present invention and existing technique

[0033] The performance of the sample processed according to this improved process is shown in Table 1. The Cercon ceramic block was sintered at the sintering temperature 1350°C recommended by the manufacturer, and a sample of the same specification with a thickness of 0.50±0.01mm was made as a control sample. The results are shown in Table 1:

[0034] Table 1 Optical and mechanical properties of dental CAD / CAM zirconia all-ceramic materials

[0035]

[0036] It can be seen from Table 1 that the zirconia all-ceramic material prepared by the process of the present invention has higher sintering density, transmittance and three-point bending strength than Cercon after controlling the powder particle size and sintering temperature. The relative density of the sample is 99.15-99.39%, and the visible light integral transmittance is 17.50-18.01%, which can fully meet the optica...

Embodiment 2

[0038] Embodiment 2 Preparation of dental CAD / CAM zirconia all-ceramic material of the present invention

[0039] by ZrOCl 2 ·8H 2 O using the reverse co-precipitation method to prepare nano-ZrO 2 Powder: First, high-purity Y 2 o 3 The powder was dissolved in 2M dilute nitric acid and heated on a magnetic heating stirrer to obtain Y(NO 3 ) 3 crystallization; the precursor zirconium salt ZrOCl 2 ·8H 2 O and Y (NO 3 ) 3 Heat the crystals together and dissolve them in absolute ethanol, prepare a 0.3M ethanol solution, and filter to remove impurities; put the above solution into a separatory funnel, drop it into 2M excess ammonia ethanol solution at a speed of 50 drops / min, and control the pH >9, after the reaction is complete, filter the precipitate on a suction filter flask and wash repeatedly with absolute ethanol. The filter cake is dried in an oven at 100°C for 24 hours, crushed and calcined to obtain nano-ZrO 2 Powder, the particle size range of powder is controll...

Embodiment 3

[0053] Embodiment 3 Preparation of dental CAD / CAM zirconia all-ceramic material of the present invention

[0054] In the sintering system, the final sintering temperature is 1450° C., and other conditions and processes are the same as in Example 2. The sintered density of the zirconia sample obtained in this embodiment is 6.0627±0.0074g / cm 3 , the relative density reaches 99.39%, basically achieves densification, and the visible light integral transmittance is 17.83±0.16%. The crystals observed by the scanning electron microscope section are all tetragonal zirconia grains, the grain size is 200-400nm, the distribution is uniform, the sintered body is dense, and no obvious pores are seen.

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Abstract

The invention provides a process for improving translucency of CAD/CAM in-ceram zirconia dental materials, comprising the following steps: a. preparing nano zirconia powder by reverse coprecipitation; b. adding organic bonds for pelleting; c. carrying out dry pressing under 20-30MPa and carrying out static pressure treatment under 200-250MPa to preform green bodies; d. pumping oxygen when the green bodies are sintered to 200-800 DEG C from room temperature, preserving heat for 30min when the green bodies are sintered to 1250 DEG C, then raising the temperature to the final sintering temperature of 1400-1500 DEG C at a rate of 200 DEG C/h and preserving heat for 2h, thus obtaining the in-ceram zirconia materials with translucency. The invention also provides the in-ceram zirconia materials prepared by the method. With the integral transmittance of visible light of 17.50-18.01%, the in-ceram zirconia materials can meet the requirement of the oral clinical in-ceram restorations for beauty.

Description

technical field [0001] The invention relates to a technique for improving the semipermeability of an oral cavity CAD / CAM zirconia all-ceramic material, which belongs to the field of dental restoration materials. Background technique [0002] Porcelain-fused-to-metal restoration technology has been developed for more than half a century, and is currently the most widely used restoration method. Although the metal bottom layer provides effective strength, it affects the transmission of incident light, the restoration lacks layering and vitality, and cannot fully reproduce the color of natural teeth. With the improvement and improvement of the performance of oral materials, "gold-free" restorations have become an ideal restoration method in the field of prosthodontics. All-ceramic restorations are favored by more and more patients and restoration doctors because of their good biocompatibility and optical properties. Compared with gold-ceramic restorations, all-ceramic restora...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61K6/027C04B35/48C04B35/622
Inventor 李伟廖运茂蒋丽赵永旗
Owner SICHUAN UNIV
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