Exploring the Unique Features of Pre-Sintered Zirconia Blocks

NTRODUCTION: Continuous innovation in materials has always driven the development of restorative dentistry, and in the field of modern restorative dentistry, the choice of material directly affects the quality and aesthetics of the final restoration. Pre-sintered zirconia blocks, with their excellent properties and wide range of adaptability, are becoming the first choice of more and more dental professionals. So what makes it so special? Let's explore in depth.

1. Basic overview of pre-sintered zirconia blocks: Pre-sintered zirconia is a polycrystalline ceramic material that undergoes a pre-fabricated sintering treatment (industrial sintering temperature at 1050°C, usually 4 days), which gives it a certain degree of strength during machining but still maintains good machinability. Pre-sintered zirconia blocks are the core of CAD/CAM dental restorative materials and can be used to fabricate crowns, bridges, inlays and other restorations. Compared to fully sintered zirconia, the pre-sintered state makes it easier to carve and machine, resulting in increased productivity and accuracy of restorations.

Unique characteristics of pre-sintered zirconia blocks, pre-sintered zirconia blocks are capable of good strength and toughness when fully sintered, and some models of pre-sintered blocks can achieve a flexural strength of more than 1,350 MPa after final sintering, providing good durability. Pre-sintered zirconia blocks have excellent fracture toughness, which helps to reduce the risk of rupture of dental restorations.


(2) Because the material is in a pre-sintered state, it also has good machinability properties and relatively low hardness, making it easier to cut and carve and improving machining efficiency.


Nowadays, there are three main models of pre-sintered zirconia blocks in the industry, 98mm diameter, 95mm diameter, and 92*75mm diameter, which can be perfectly applied to mainstream CAD/CAM equipment to ensure the accuracy and edge fit of the restorations.


(3) Excellent biocompatibility: zirconia is a highly biocompatible material that does not cause allergic reactions and is friendly to gum tissue.


A well-processed zirconia block denture also has extremely low bacterial adhesion, which helps maintain oral health.

(4) Natural-looking light transmission: Modern pre-sintered zirconia is optimized to provide light transmission close to that of natural teeth.
It is suitable for both anterior and posterior restorations and meets the high standard of aesthetic restorations demanded by patients, especially the 4D PRO multilayer zirconia blocks produced by HONCHON.

2. Application areas for pre-sintered zirconia
1. Single-unit crowns: including anterior and posterior restorations.
2. Multi-unit bridges
3. Inlays and veneers:
4. Implant restorations:

3. Production and processing technology(1)
Production process powder preparation: mainly mixing, purchasing zirconia powder, stabilizer powder, inorganic pigment powder made by upstream manufacturers, mixing all kinds of powders according to a specific ratio.

2. Dry pressing, put the powder into the abrasive tool, through the dry pressing equipment, the powder is pressed to make the blank block.

3. Cold Isostatic Pressing: The blanks are sealed and put into the cold isostatic pressing equipment and pressed for 8 minutes, the pressing time varies from factory to factory.

4. Pre-sintering: The blanks are put into the pre-sintering kiln and fired for about 4 days at a temperature of 1050 degrees Celsius, which varies from factory to factory.

5. Milling: The sintered blanks are milled to specific dimensions to fit the fixtures of mainstream dental milling machines.

6. Inspection: The pre-sintered zirconium blocks are fully inspected to measure shrinkage, etc.
7. Packing and shipping: The fully inspected pre-sintered zirconia blocks are packed into cartons and then sealed for shipping.

6. Advantages of Honchon pre-sintered zirconia blocks.

High-quality materials: we only purchase powder from industry-leading Shandong Guocera.
Advanced manufacturing process: We use imported dry presses and other cool press equipment. Better product consistency.
Precise cutting experience: optimized pre-sintered hardness, effectively reduce tool wear, customer feedback from Spain, our zirconium blocks can improve machining efficiency by 15%.
Multiple color choices: Support multiple colors, multiple sizes with very cheap price.
Reliable quality control: we introduced ISO13485 quality management system to effectively ensure the qualification rate of our products, now our qualification rate is at 96%.


6. Conclusion: pre-sintered zirconia blocks have become the first choice for dental restorations due to their high strength, hardness, wear resistance, chemical resistance, structural stability, low thermal conductivity, low shrinkage, high toughness, and high modulus of elasticity.Honchon is a professional manufacturer of pre-sintered dental zirconia blocks, which is committed to providing high-quality zirconium oxide products and helping the dental industry to innovate and develop.If you are are interested in our products, you can submit the form below and we will contact you at the first time.