The zirconia system is a method of creating all ceramic teeth to achieve a natural appearance. There are actually a number of different zirconia systems available although they all follow the same basic premise. The primary differences relate to the materials used to create the teeth. The goal of this system is to create strong, translucent, all ceramic teeth which provide a natural appearance through shade matching.
One of the biggest reasons the zirconia system is popular is because it is available for both crowns and bridges. This high-strength material offers excellent marginal integrity which leads to a fracture rate of less than .5 percent. Zirconia is a ceramic oxide which is formed from a chemical reaction between zirconium metal and oxygen. It is important to note that there can be significant differences between zirconia-based dental restorations. This is primarily due to the dental grade-based powders as well as the processing methods that different manufacturers use. Overall, these differences can have a major effect on clinical outcomes such as fit, strength, and long-term stability.
A common concern is whether or not zirconia will degrade when exposed to oral fluids. Any restoration material used in dental work may experience a slight degradation in chemical performance over time. With the zirconia system this is primarily dependent on the chewing forces of the patient as well as oral fluid exposure. Avon nearing layer of porcelain provides a helpful layer of protection to the zirconia material.
Another concern is that several clinical studies have shown a weakness in the overlay materials which can cause fractures at the marginal ridge areas. While these studies raise a valid point, porcelain veneers have been successfully used for an exceptionally long time. One applied correctly, with a good load bearing design, veneers with varying fleck strings have all proved to perform extraordinarily well. The key is following manufacturer guidelines during the adhesion process.
There are a variety of different composite resins which can be used during the application process. The key is to utilize a strong composite resin which relies on a ceramic nano fiber. This will significantly increase the strength of the resin over time. Another key variable is proper flow rate to minimize shrinkage and maximize the effectiveness of the composite resin.
To ensure the zirconia system creates the best looking results possible it is important to utilize an individual shade guide correctly. This will determine the best color choice for a more natural look.
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