High-Strength Dental Zirconia Blocks and Zirconia Crown Blocks Milling Blocks

Dental zirconia blocks are made from yttrium-stabilized zirconia (YTZP) ceramic powder through dry pressing, isostatic pressing, and preliminary sintering (pre-sintering). Dentists or technicians obtain dental data through intraoral scanning or model scanning, design the restoration shape on a computer, and then use a CNC milling machine to cut the restoration shape from the pre-sintered zirconia block. Finally, high-temperature densification sintering is performed to create the final restoration.

Dental zirconia blocks are a revolutionary material in modern restorative dentistry and serve as the core blank for crowns, bridges, and other restorations.

The use of zirconia in dentistry is revolutionary because it perfectly addresses many of the shortcomings of traditional materials:

1. Extremely High Strength and Toughness

Its flexural strength reaches 900-1400 MPa, far exceeding all other dental ceramics (e.g., glass ceramics, which are approximately 100-400 MPa) and even surpasses some metals.
Advantages: Extremely tough and resistant to cracking. This makes it suitable for single crowns in the posterior region and long multi-unit bridges (restoring multiple consecutively missing teeth), which are difficult to achieve with traditional all-ceramic materials.

2. Excellent Aesthetics

3. Excellent Biocompatibility
Zirconium oxide is an inert material, non-irritating and non-sensitizing to human tissue, and does not cause allergic reactions (superior to some metals). It also has excellent biocompatibility.

4. Low Thermal Conductivity
Zirconium oxide crowns offer excellent insulation against heat and cold, making them less susceptible to temperature sensitivity in patients wearing them.

5. Excellent Chemical Stability
Zirconium oxide blocks are stable and corrosion-resistant, resisting corrosion or dissolution in the oral environment. They also resist plaque adhesion, promoting gum health.

6. Precise Machinability

Dental zirconia blocks can be fabricated using CAD/CAM technology for a variety of restorations:

• Crowns: Restoring single teeth, especially in the posterior region.
• Bridges: Restoring multiple consecutively missing teeth, such as three- or four-unit bridges for anterior teeth and longer bridges for posterior teeth. 
• Implant superstructures: Includes implant crowns and bridges.
• Veneers (rarely): Supertranslucent zirconium oxide can be used to create veneers.
• Inlays/Onlays: Used to repair larger tooth defects.
• Implant abutments: Customized zirconia abutments offer superior aesthetics compared to titanium abutments.