12/27/2022 0 Comments Cad cam crowns![]() 5 Zirconia has a normal density of 6 g/cm 2, where the theoretical density (ie, 100% dense) of zirconium oxide is 6.51 g/cm 2. The interest in using zirconia as a biomaterial is based on its mechanical strength, as well as its chemical and dimensional stability and elastic modulus similar to stainless steel. 6 Zirconia as a pure oxide does not occur in nature. It is technically incorrect to refer to the material as zirconia oxide, but the dental vernacular refers to it as zirconia, just as it uses alumina for the term alumina oxide and magnesia for magnesium oxide. 5 Although it has been given the nickname "ceramic steel," the correct terminology is zirconia dioxide. Zirconia is the oxide of zirconium (Zr) metal found in nature combined with silicate oxide with the mineral name Zircon (ZrO 2 SiO 2) or Baddeleyite. Characteristics and Properties of Zirconia ![]() The decision to use this material is based on improved esthetics and the patient’s desire to be metal-free, but it is imperative that the clinician understands the intricacies of zirconia. Unlike metal copings and multiple-unit frameworks that are virtually indestructible, zirconia has to be treated differently. There are short-term zirconia-based successes reported, 1-4 but further observation is still necessary. ![]() If zirconia is to replace metal, then it is the responsibility of the clinician to acquire as much knowledge as possible regarding the handling characteristics of the material. At times, it may seem less stressful to leave the decision about which dental material should be used to the laboratory technician, when, in fact, dentists are the ones rightly responsible for the prosthetic restorations placed in their patients’ mouths.Ĭonsequently, dentists must be well-informed as to the type of dental materials they are prescribing for their patients, as well as their proper use and care. Whether it is the recent dental school graduate or the seasoned dentist, today’s clinicians are bombarded with an overwhelming amount of information this can be quite confusing, and not all manufacturer information may be 100% accurate. Keyboards, monitors, and cursors are used instead of Bunsen burners, wax, and carving instruments to fabricate crown-and-bridge frameworks. The burnout oven and casting machine have been replaced by model scanning and CAD/CAM milling machines. This could explain the surge in the number of new computer companies entering the computer-aided design/computer-aided manufacturing (CAD/CAM) marketplace. Most zirconia single copings and fixed partial denture (FPD) frameworks are milled from blocks of zirconia through the use of computer technology. The use of zirconia as a metal substitute is a principal driving force behind the ever-increasing development and use of computerized dentistry. Helveyĭental laboratory technology is evolving at a rapid pace. ![]() Zirconia and Computer-aided Design/Computer-aided Manufacturing (CAD/CAM) Dentistry Gregg A. ![]()
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