From Powder to Finished Block: Inside Yucera's Zirconia Production Process

Introduction

Every dental zirconia block goes through a long, carefully controlled journey before it ever reaches a milling machine. What starts as fine zirconia powder becomes a precisely shaped, uniformly dense block only after passing through six distinct production stages — each with its own equipment, parameters, and quality checks. This article walks through Yucera's full zirconia block production process, from raw material mixing to final printing and packaging.

Step 1: Raw Material Mixing

The process begins in the mixing workshop, where V-type mixers and three-dimensional (3D) mixers blend the raw zirconia powder. Because different raw materials have different characteristics, each batch is mixed using a specific formula and mixing time tailored to that material. Dedicated staff are responsible for measuring out the powder strictly according to the formula and ratio before it is released to the dry pressing workshop for forming.

Step 2: Dry Pressing and Molding

Dry pressing is the second stage, and it takes place across two separate workshops, each dedicated to a different product line:

• Workshop 1 – Colored Zirconia Forming: Based on the specific properties of the powder, the appropriate parameters are applied as the material is filled, leveled, and dry-pressed into shape, bringing the block to its target density, thickness, and outer diameter.
• Workshop 2 – White Zirconia Forming: This workshop houses three dry-press machines. Because blocks vary in powder composition and thickness, each machine is set with parameters matched to the specific block being formed.

Step 3: Cold Isostatic Pressing (CIP)

After dry pressing, the formed blocks are inspected and then vacuum-packed. At this stage, the blocks are extremely fragile — even a light knock can cause chipping or cracking — so they move immediately into cold isostatic pressing.

In this step, a hydraulic press uses water as the pressing medium, applying pressure evenly around the entire block. Depending on the product's characteristics and process requirements, pressure can reach up to 280 MPa to achieve the target outer diameter, thickness, and density. The result: the block becomes smaller in volume and higher in density. Once the pressed blocks pass dimensional and quality inspection, they move on to the next stage.

Step 4: Pre-Sintering

Yucera's zirconia sintering line runs 35 meters long and operates continuously around the clock, with a daily output of 600 to 900 blocks. The line is divided into three temperature zones:

• Low-temperature zone and medium-temperature zone: These zones are primarily responsible for debinding. Zirconia powder contains a significant amount of binder, and as the blocks pass through these zones, the furnace gradually raises the temperature, allowing sustained heat to slowly evaporate the binder material out of the block.
• High-temperature zone: This final zone brings the product to a much higher density. The degree of density increase varies from block to block, depending on the specific formulation and product type.

Step 5: Machining (Edge Shaping)

Once pre-sintering is complete, the blocks move to the contour machining workshop, where the outer edges and shape are machined. This workshop currently operates six pieces of shaping equipment, allowing blocks to be machined to the exact dimensions and appearance specified by the customer.

To maintain consistency, staff take the first and last piece from every production batch and measure them, confirming that every block in that batch meets the required outer dimensions before the batch is approved.

Step 6: Printing and Packaging

The final stage is printing and packaging. The logo and text to be printed on each block are first laid out digitally, then printed directly onto the block using dedicated printing machines. These machines are equipped with UV lamps, allowing the ink to be cured instantly during printing. Yucera currently operates two printing machines, each capable of printing approximately 100 blocks per hour.

Conclusion

From the first measured scoop of zirconia powder to the final UV-cured print on a finished block, Yucera's production process is built around consistency at every stage: precise formulas in mixing, controlled parameters in pressing, exact pressure in cold isostatic pressing, carefully managed heat in sintering, batch-level dimensional checks in contour machining, and instant-cure printing in the final step. Each stage exists to make sure the block that reaches a dental lab performs exactly as expected — every time.