Method for producing zircon oxide blank

A technology of zirconia blanks and zirconia, which is applied in the field of preparation of zirconia blanks, which can solve the problems of zirconia blanks, such as laborious, long processing time, unsatisfactory and long duration of dental restorations, etc., and achieve high translucency and good optical properties Effect

Pending Publication Date: 2020-06-05
IVOCLAR VIVADENT AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, conventional methods for preparing zirconia blanks are laborious, and the blanks prepared with them require long processing times for dense sintering, especially in order to obtain the desired optical properties, such as high translucency
The entire process of densely sintering a conventional blank starting from heating to sintering temperature and ending with cooling to room temperature typically takes well over 4 hours, which significantly results in an unsatisfactorily long duration for machining to form dental restorations

Method used

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  • Method for producing zircon oxide blank
  • Method for producing zircon oxide blank
  • Method for producing zircon oxide blank

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] Example 1 - Suspension with 76% by weight zirconia

[0088] 3.15 g of a dispersant containing citric acid or citrate (Dolapix CE64 from Zschimmer & Schwarz) and 1.5 g of tetramethylammonium hydroxide were successively dissolved in 194.4 g of distilled water. The pH of the solution is 10-10.5.

[0089] This solution was placed in the tank of a MicroCer agitated bead mill (from Netzsch) whose grinding chamber and rotor were made of zirconia. The grinding chamber was filled with 60 ml of zirconia grinding beads (from Tosoh) with a diameter of 0.2-0.3 mm. The solution was continuously pumped through the milling chamber using a peristaltic pump (tubing inner diameter 8 mm) at a rotor speed of 1500 rpm. Then, under stirring and continuously, 630 g was added with 3 mol% Y 2 o 3 Partially stabilized zirconia powder (TZ-PX-245 from TOSOH Corporation, primary particle size: 40 nm) was added to the solution in the storage tank. Once the addition of the zirconia powder is ...

Embodiment 2

[0102] Example 2 - Suspension with 83% by weight zirconia

[0103]To prepare a suspension with 83% by weight zirconia and process it to form a test piece (A) and a block (B) for "chairside" applications, Example 1 was repeated with the change that 164.5 g of distilled water was added , 4.05 g of a dispersant containing citric acid or citrate (Dolapix CE64 from Zschimmer & Schwarz) and a solution of 1.5 g of tetramethylammonium hydroxide, and 810 g of Y with 5 mol % 2 o 3 Partially stabilized zirconia powder (TZ-PX-430 from TOSOH Corporation, primary particle size: 90 nm) and pre-sintered at 900° C. for 2 h with the same heating rate of 0.250 K / min.

[0104] The viscosity η of suspension is 7.0mPas (at 1000s -1 shear rate and temperature of 25°C).

[0105] Each test piece obtained according to (A) has the following properties:

[0106] - Linear shrinkage: 14.43% (test piece: length = 25mm ± 1mm, width = 5mm ± 0.5mm and height = 4mm ± 0.5mm)

[0107] - Density: 3.791g / c...

Embodiment 3

[0111] Example 3 - Suspension with 80% by weight zirconia

[0112] To prepare a suspension with 80% by weight of zirconia and process it to form test piece (A), Example 1 was repeated with the change that 179.5 g of distilled water, 3.6 g of dispersant containing citric acid or citrate were added (Dolapix CE64 from Zschimmer & Schwarz) and 1.5 g of tetramethylammonium hydroxide solution, and the addition of 720 g with 4.25 mol% Y 2 o 3 Partially stabilized zirconia powder (TZ-PX-551 from TOSOH Corporation, primary particle size: 90 nm).

[0113] The viscosity η of suspension is 14.6mPas (at 500s -1 shear rate and temperature of 25°C).

[0114] The test pieces obtained according to (A) have the following properties:

[0115] - Linear shrinkage: 14.59%

[0116] - Density: 3.780g / cm 3 .

[0117] The test pieces obtained according to (A) were pre-sintered at 1000° C. for 2 h. The heating rate is 0.250K / min. The test pieces were then cooled to room temperature within 2...

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Abstract

The invention relates to a process for the preparation of a zirconia blank by introducing a zirconia suspension into a porous mould and demoulding the blank formed as well as the use of the optionallypresintered blank formed for the preparation of a dental restoration by using a very short dense-sintering process.

Description

technical field [0001] The present invention relates to a method for the production of zirconia blanks which, after the desired shaping, can be densely sintered in a very short time to form dental restorations with excellent optical properties. Background technique [0002] Zirconia ceramics are frequently used to prepare fully anatomical dental restorations. They offer high clinical safety, are metal-free, can also be used in minimally invasive preparations, and are very attractively priced compared to other metal-free restorations. Restorations are usually milled or ground from pre-sintered blanks, densely sintered by heat treatment, and finally optionally provided with veneering and / or glazing. [0003] Methods for preparing zirconia blanks and their processing to form dental restorations are known. [0004] WO 2014 / 209626 describes a method for the preparation of zirconia blanks which, after pre-sintering and processing by CAD / CAM methods, can be processed by dense sin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/488C04B35/626C04B35/64A61K6/818
CPCC04B35/488C04B35/6263C04B35/64C04B2235/3225C04B2235/3227C04B2235/3229C04B2235/3206C04B2235/3208C04B2235/5454C04B2235/5445C04B2235/608C04B2235/6562C04B2235/6567C04B2235/9615C04B2235/9653C04B2235/9661A61C13/0022A61K6/807A61K6/822A61K6/818C04B35/486C04B2235/6027C04B2235/549C04B2235/3246C04B35/6264C04B35/62685C04B38/00C04B2235/77C04B2235/661C04B35/632C04B35/6261C04B35/62635C04B2235/95C04B2235/6565C04B2235/96C04B35/638C04B2235/6586C04B2235/6585C04B2235/6581A61K6/887C08L33/10C08L29/04C04B35/48C04B38/0054A61C13/20A61C13/083C04B2111/00836A61C13/0006B28B1/26C04B2235/606
Inventor 姜波F·罗斯布鲁斯特C·里茨伯格
Owner IVOCLAR VIVADENT AG
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