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Dental Tribune Middle East & Africa Edition | 6/2016 6 industry TheCERECSpeedFiresinteringfurnace 1. After a cusp fracture in a tooth restored withamalgam,IproposedaCERECcrown madeoffullcontourzirconia Digital impressions: The scan with Om- nicam is done in the same way as with conventionalCERECrestorations(2min) 3. The CEREC software reconstructs the crown automatically with the Biojaw al- gorithm Milling: Zirconium oxide is milled in en- larged form.This allows for more detailed finishingof thestructures(10min) Polishingandglazing:Therestorationcan be individualized between both steps (12 min) 5. Finally, I placed the finished polished crown made from pre-colored zirconium oxidein thepatient’smouth 2. I drew in the preparation margins on the virtual model with the help of the au- tomaticmarginfinder Designing on CEREC AC: Excellent initial proposals are generated with the Biojaw algorithm(8min) 4. In the preview, I checked the position of thecrownin theceramicblock. Adjustments could be made at this point ifneeded Sintering:Theassistantplacestherestora- tion in the CEREC SpeedFire furnace and starts the sintering process with a touch- pad(16min) Fittingandfinishing:Therestorationisce- mented in the usual way. The remaining cement residue is then removed and the marginssmoothed(8min) High-Temperature Furnace for More Speed By Dentsply Sirona For high masticatory forces, zirco- niumoxideisthematerialofchoice. The new CEREC SpeedFire sintering furnace accelerates processing time. In this way Dr. Michael Skramstad from Minnesota, USA, can provide his patients in a single visit. Zirconiumoxideisalmostashardas dental alloys. The biocompatible ce- ramic has been successfully used in dentistryforover15years–firstonly as a veneering framework material and for the last six years also for full anatomical crowns. This gives me the assurance to now use the mate- rial chairside when placing a crown that still has to sit perfectly years from now. Besides its high stability and du- rability, zirconium oxide has two more important advantages: The flexural strength of the material al- lows me to fabricate restorations with very thin wall thicknesses. This enables me to prepare the tooth in a substance friendly way. In addition, restorations can be placed more eas- ily: Traditional cement rather than adhesive bonding is used. Making Good Use of WaitingTimes Fabricating and placing full contour zirconiarestorationsinoneappoint- ment is possible due to the fact that Icansinterdry-milledzirconiumox- ide very quickly with the new CEREC SpeedFire furnace. For one crown, the device usually requires between 12 and 15 minutes. The entire pro- duction process therefore takes less IMAGESANDADDITIONAL INFORMATION CROWNRESTORATIONMADEBYCERECZIRCONIA FABRICATIONOFZIRCONIUMOXIDERESTORATIONSINJUSTUNDERTWOHOURS than 90 minutes. Patients do not mind having to wait such a short time for their crown and use the time to read or watch a film. There is no need for them to make a sec- ond appointment and they do not require a temporary. An immedi- ate restoration makes a lot of sense fromaclinicalperspectivebecauseit allows for better preservation of the remaining tooth substance. I personally devote only around 30 minutes of my work time to this process. In the meantime, I do the preparation, take an impression of it with CEREC Omnicam, design the restoration and then fit it into place. I then delegate the remaining work steps to my assistant. While the crown is milled on the CEREC MC XL Premium Package, I tend to other As a long-time CEREC user, I know andappreciatetheadvantagesofbe- ing able to produce crowns, inlays, onlays and bridges in justone ses- sion. The chairside process is a com- fort that my patients have known and expected from us for 12 years already. By now, all four dentists in my practice use CEREC. Chairside restorations have become indispen- sable for our practice and contribute significantly to its economic success. Forsometimenow,Ihavebeenhop- ing to be able to produce full ana- tomical zirconia restorations in my practice and provide them in one visit. When Dentsply Sirona CAD/ CAM made this possible with CEREC, I immediately included the fabrica- tion of full contour zirconia crowns as part of my services. Producing Zirconium Oxide Easily inThe Practice My experiences with CEREC Zirconia have been very positive. Fabricating dental prostheses from full contour zirconia using CAD/CAM technolo- gy is easy; we familiarized ourselves with the process very quickly. This is not surprising since the process is hardlyanydifferentfromproducing other milled restorations. By means of full anatomical zirconium oxide chairside fabrication with CEREC becomes even more versatile and economical. A great benefit for my practice! First publication: VISION, Customer magazine of Dentsply Sirona; Issue 1/2016, p. 32-34. patients. My assistant also operates the CEREC SpeedFire. The user in- terface is self-explanatory. The res- toration just needs to be placed on the occlusion surface and the start button pressed – that is all. Dental assistants can also do repolishing, individualization and glazing. I only come back in the treatment room once the crown has been glazed and is ready for placement. Dr.MichaelSkram- stadisadentist in Orono,Minnesota, USA.Hespecializes inrestorativeand cosmeticdentistry aswellasimplantol- ogy.Heisacertified trainerforPatterson Dentalandlecturesinternationallyon digitaldentistry.