Comparison of conventional (i.e. biaxial/isostatic) pressing methods vs the new HSD (Homogeneous Sequential Deposit) method

3-Dimensional Accuracy of Sintered YTZP Zirconia
3-Dimensional Accuracy of Sintered YTZP Zirconia
3-Dimensional Accuracy of Sintered YTZP Zirconia

Test samples of conventional (A) & SLD (B) zirconia

3D scanning of milled 16 unit zirconia bridge

Confirmation of accuracy with inspection software

Test Preparation

3-Dimensional Accuracy of Sintered YTZP Zirconia
3-Dimensional Accuracy of Sintered YTZP Zirconia

• 16-unit- bridge model milled from

titanium to avoid the wear that is inevitably found over time in stone models.

• Disc A: Biaxial/Isostatically

pressed conventional zirconia sample. Enlargement factor: 1.2542

 

• Disc B: Zirconia disc

manufactured via the new SLD (Sequential Liquid Deposit) method. Enlargement factor: 1.2051

Before Sintering

After Sintering

3-Dimensional Accuracy of Sintered YTZP Zirconia

Disk A

Biaxial/Isostatically pressed conventional zirconia sample. Enlargement factor: 1.2542

Disk B

Zirconia disc manufactured via the new SLD (Sequential Liquid Deposit) method.

Enlargement factor: 1.2051

B&D Dental Inspection Software

The designed file

(designed based on the scanned titanium model)

+

The scanned file of the milled & sintered zirconia

3-Dimensional Accuracy of Sintered YTZP Zirconia
3-Dimensional Accuracy of Sintered YTZP Zirconia
3-Dimensional Accuracy of Sintered YTZP Zirconia
3-Dimensional Accuracy of Sintered YTZP Zirconia

Conventional Method

Biaxial/Isostatic Pressing (German company A) – view 1

3-Dimensional Accuracy of Sintered YTZP Zirconia
3-Dimensional Accuracy of Sintered YTZP Zirconia

Biaxial/Isostatic Pressing (German company A) – view 2

3-Dimensional Accuracy of Sintered YTZP Zirconia

Biaxial/Isostatic Pressing (German company B)

3-Dimensional Accuracy of Sintered YTZP Zirconia
3-Dimensional Accuracy of Sintered YTZP Zirconia

New SLD (Sequential Liquid Deposit) Method

Origin Live Zirconia

3-Dimensional Accuracy of Sintered YTZP Zirconia
3-Dimensional Accuracy of Sintered YTZP Zirconia

Comparison of Accuracy in Sintered Zirconia

Biaxial/Isostatic pressing

(German company A)

Biaxial/Isostatic pressing

(German company B)

Sequential Liquid Deposit

(B&D Dental, Origin Live Plus)

3-Dimensional Accuracy of Sintered YTZP Zirconia
3-Dimensional Accuracy of Sintered YTZP Zirconia
3-Dimensional Accuracy of Sintered YTZP Zirconia
3-Dimensional Accuracy of Sintered YTZP Zirconia
3-Dimensional Accuracy of Sintered YTZP Zirconia

Where Does This Difference Come From?

3-Dimensional Accuracy of Sintered YTZP Zirconia
3-Dimensional Accuracy of Sintered YTZP Zirconia

SEM Picture Are Taken to Show the Distribution of Zirconia

Particles in the Green Body (before sintering)

3-Dimensional Accuracy of Sintered YTZP Zirconia
3-Dimensional Accuracy of Sintered YTZP Zirconia
3-Dimensional Accuracy of Sintered YTZP Zirconia

Univ. of Utah, Utah NanoFAB

Dept of Biomaterial Engineering

Prepared samples before being charged

Scanning electron microscope (SEM),

Model: FEI Quanta 600

 

3-Dimensional Accuracy of Sintered YTZP Zirconia
3-Dimensional Accuracy of Sintered YTZP Zirconia
3-Dimensional Accuracy of Sintered YTZP Zirconia
3-Dimensional Accuracy of Sintered YTZP Zirconia

Conventional biaxial/isostatic pressing method

Spray-dried granules/particles are loosely compacted.

New Homogeneous Sequential Deposit (HSD) method

Deagglomerated smaller particles are homogeneously and densely compacted.

SEM Picture Are Taken to Show the Distribution of Zirconia

Particles in the Green Body (before sintering)

Conventional biaxial/isostatic pressing method

New Homogeneous Sequential Deposit (HSD) method

3-Dimensional Accuracy of Sintered YTZP Zirconia
3-Dimensional Accuracy of Sintered YTZP Zirconia
3-Dimensional Accuracy of Sintered YTZP Zirconia
3-Dimensional Accuracy of Sintered YTZP Zirconia
3-Dimensional Accuracy of Sintered YTZP Zirconia
3-Dimensional Accuracy of Sintered YTZP Zirconia

Uneven distribution of powder density causes the sintering distortion

Even distribution of powder density from The New HSD (Homogeneous Sequential Deposit) method

Uneven Distribution of Density Under the Dry Compaction Method

(Biaxial/Isostatic pressing method)

3-Dimensional Accuracy of Sintered YTZP Zirconia
3-Dimensional Accuracy of Sintered YTZP Zirconia

Zirconia Powder

3-Dimensional Accuracy of Sintered YTZP Zirconia

Uniaxial pressing of the material

The uneven distribution of density of the powder even lasts after post-isostatic pressing stage

YTZP Zirconia Translucency Test Results

Comparison of Commercially Available High Translucent Zirconia Brands in USA

 

LIVE Aesthetic Zirconia: Accuracy

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