Yes, zirconia crowns can be milled.
The process involves using CAD/CAM technology to shape zirconia into crown forms.
After milling, the zirconia undergoes a sintering process, which is crucial for enhancing the mechanical strength and final properties of the material.
Can you mill zirconia crowns? 4 Key Steps Explained
1. Milling Process
Zirconia crowns are typically milled using CAD/CAM systems.
These systems use computer-aided design to create a digital model of the crown, which is then used to guide the milling process.
The zirconia blocks used for milling are available in fully sintered and presintered forms.
Fully sintered zirconia blocks are denser and stronger but require longer milling times and can wear down machining tools more quickly.
Presintered blocks, on the other hand, are easier to shape and mill but require a subsequent sintering process to achieve their maximum strength.
2. Sintering Process
After milling, zirconia undergoes sintering.
This is a process where the material is heated to a high temperature to fuse its particles together without melting the material to a liquid state.
This process is essential as it densifies the zirconia, making it harder and stronger, which is critical for the durability of dental crowns.
Sintering also affects the esthetics of the crown, ensuring it meets the desired appearance.
3. Benefits and Applications
The ability to mill zirconia crowns has significant benefits in dental practices.
One of these benefits is the ability to offer "Same Day Crowns."
This is possible due to the high-speed sintering processes that have been developed, allowing for the production of single-tooth crowns and bridges in a single day.
This rapid turnaround time is a major advantage for patients who require immediate dental restorations.
4. Material Advantages
Zirconia crowns are popular due to their superior fracture strength and toughness compared to other dental ceramic systems.
They are used for both anterior and posterior teeth restorations, offering excellent esthetics and resistance to loading.
The accuracy of fit is also crucial for the clinical success of these crowns, ensuring they function well and last long.
In summary, the milling of zirconia crowns is a technologically advanced process that leverages CAD/CAM technology and sintering to produce durable, aesthetically pleasing, and quickly deliverable dental restorations.
This capability significantly enhances the efficiency and service offerings of dental practices.
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