Porcelain furnaces are essential tools in dentistry. They are used to process raw dental porcelains to achieve optimal maturity.
These furnaces help maintain important features of the restoration. These include surface texture, translucency, value, hue, and chroma.
Porcelain furnaces are sophisticated, electronically-controlled devices. They have programmable cycles for firing dental porcelains. This includes metal-ceramics and all-ceramics like zirconia or lithium disilicate.
5 Key Functions Explained
1. Refractory Firing Chamber
The porcelain furnace operates using a refractory firing chamber. In this chamber, porcelain is built up and placed onto various supports for firing.
2. Built-in Vacuum Pump
A key feature of these furnaces is the built-in powerful vacuum pump. This pump is essential for evacuating the firing chamber during firing. It prevents undesirable opacity in the porcelain.
3. Different Types of Ceramic Furnaces
There are different types of dental ceramic furnaces. These include firing furnaces, pressing furnaces, sintering furnaces, and glazing furnaces. Each type serves specific functions in the processing of ceramic materials.
4. Temperature and Heat Rate Control
Firing furnaces vitrify porcelain and require accurate temperature and heat rate control. They often operate under vacuum. Pressing furnaces, in addition to similar control requirements, include pressing hardware and controls for pressing materials like pressable porcelains and ceramics.
5. Sintering and Glazing
Sintering furnaces operate at higher temperatures. They are used for the actual sintering process, such as for zirconia. These furnaces require special ceramic heating elements and power control electronics. Glazing furnaces are used to glaze the surface of dental prostheses. They set stains and glazes to add final shade details to a restoration.
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