As with all new materials and technology, dental zirconia does have its drawbacks.
Many dentists are hesitant to use zirconia because there are fewer long-term research studies to assess its properties and compare the longevity of the material to gold, porcelain, and lithium disilicate. However, the studies completed thus far all reflect positively on the future of zirconia crowns.
There is also a lack of ability to bond the material to the preps. Though, that might be seen as an advantage by some, since only cement is needed to permanently seat the restoration. The hardness, while certainly considered one of zirconia’s advantages, might be a disadvantage when having to remove or access through them for endodontic treatment.
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The future of zirconia use in dentistry is unlimited.
Gold and other noble metals used for decades are slowly dying out due to not only prohibitive cost, but also lack of demand by consumers. Zirconia more than fills that gap.
Researchers continually improve the translucency of these restorations, making them legitimate rivals to all-ceramic for beauty and surpassing other dental materials for strength and durability.
Here are First Choice Dental Lab, we specialize in all types of zirconia restorations, including full-contour and esthetic anterior.
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Pre shaded zirconia has become popular with dental laboratories due to the time-savings and shade consistency the base shade provides. With pre-shaded zirconia there is no need for laboratory technicians to shade each unit in the green stage, saving production time and freeing them up to produce more units. However, standard pre-shaded zirconia systems require the dental laboratory to stock an inventory of 16 shades, each in a large selection of disc thicknesses to cover all unit shades and sizes. Furthermore, you can mill only one shade at a time, thus tying up your mill.
The ArgenZ Anterior Value Shaded Disc System is a collection of pre-shaded super translucent zirconia that covers all 16 shades of the VITA Classic shade guide with just six value-shaded discs. Each disc covers 2-3 shades based on value and chroma, requiring much less inventory and mill time. No green stage shading is required. You simply design, mill, sinter, and stain and glaze.
Production of Glass Ceramic Materials
Glass ceramic components are formed using the same processes that are applicable to glass components. To convert them from a vitreous glass material into a crystalline glass ceramic material they must be heat treated or devitrified.
Devitrification can occur spontaneously during cooling or in service, but is most commonly incorporated to produce glass ceramics. It involves heating the formed glass product to a temperature high enough to stimulate crystals to nucleate throughout the glass. The temperature is then increased, which induces growth of the nuclei, crystallising the remaining glass.
Nucleation requires a critical number of atoms converging to form a nucleus. When the nucleus reaches critical size, nucleation occurs. In many glass compositions, nucleation is hampered by the fact the material is silica-based and highly viscous, making it difficult for the required atoms to come together. The crystal compositions can also be complex making nucleation difficult. These factors aid glass forming and cooling without crystallisation.
The devitrification heat treatment must be carefully controlled to ensure the maximum number of nuclei are formed and that these nuclei grow into a uniform fine crystal structure. In order to obtain a high concentration of nuclei throughout the structure, it is common to add a nucleating agent to the glass composition.
How are resin frameworks made? CAD design software is used to design the framework and then it is milled out using milling machines. The resin clasps engage the origin of the undercut rather than the terminal third to allow three to four times the retention of metal. In addition to a superior esthetic color, the resin clasps can be placed more gingival, further increasing its natural appearance.
Acetal dental can also be used for tooth shaded clasps on acrylic partials as well as a single and two tooth posterior unilateral partials. The latter situation is a great way to make an interim partial for a patient having implants placed.
For these reasons, we believe in recommending acetal resin to other dentists and our customers. It’s a strong, versatile material that has proven to be superior to using metal clasps and frameworks. We are committed to researching and finding the best products for our dentists.
Roland DGA Corporation’s three Diamond-Coated Dental Milling Burs, meant to be used with Roland’s DXW-50 zirconia milling machine, are specially engineered for precise performance, maximum durability, and longer life. Extensively tested for tolerances, Roland’s new milling burs are available in three different sizes – 2 mm, 1 mm and 0.8 mm – allowing dental professionals to choose an ideal tool for every milling strategy.